gtkform et contrainte

**turboiii** · 26/03/2020, 23h54

Hello la team gtk

En fouillant sur le net je suis tombé sur un code qui fait une expérience pour contraindre des widgets dans un autre. Comme c'était du gtk2, je me suis dit que cela pourrait être intéressant de le migrer à Gtk3 d'autant plus que c'est de la customisation de widget.

Bon le plus gros du job est fait. Mais il reste encore quelques points car le fonctionnement n'est pas abouti.

Voici mes fichiers, header

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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#ifndef __GTK_FORM_H__
#define __GTK_FORM_H__
 
 
#include <gtk/gtk.h>
//gtk_form.h
G_BEGIN_DECLS
 
#define CB_TEST
 
G_DECLARE_FINAL_TYPE(GtkForm, gtk_form,GTK , FORM , GtkContainer)
/** signification des paramètres
 * le préfixe GtkForm pour la classe GtkFormClass
 * gtk_form pour définir le type gtk_form_get_type()
 * le transtypage GTK_FORM
 * l'ancêtre GtkContainer
 **/
 
typedef struct _GtkFormChild	  GtkFormChild;
typedef struct _GtkFormConstraint GtkFormConstraint;
 
typedef enum
{
  GTK_FORM_ATTACH_NONE,
  GTK_FORM_ATTACH_FORM,
  GTK_FORM_ATTACH_WIDGET,
  GTK_FORM_ATTACH_OPPOSITE_WIDGET,
  GTK_FORM_ATTACH_CENTER,
  GTK_FORM_ATTACH_SELF
} GtkFormAttachment;
 
typedef enum
{
/* N O T E:  These numbers ARE NOT ARBITRARY!! */
  GTK_FORM_EDGE_TOP = 0,
  GTK_FORM_EDGE_LEFT = 1,
  GTK_FORM_EDGE_BOTTOM = 2,
  GTK_FORM_EDGE_RIGHT = 3
} GtkFormEdge;
 
 
/* Type definition */
typedef struct _GtkFormPrivate GtkFormPrivate;
 
struct _GtkForm
{
  GtkContainer parent;
 
  GList *children;
  /*< Private >*/
   GtkFormPrivate *priv;
};
 
struct _GtkFormClass
{
  GtkContainerClass parent_class;
};
 
struct _GtkFormConstraint
{
  gint location;
  gint attachment;
  gint offset;
  gint factor;
  gint state;
  gboolean lower_container_relative;
  GtkFormChild *child;
  gfloat fraction;
};
 
struct _GtkFormChild
{
  GtkWidget *widget;
  GtkFormConstraint constraints [4];
};
 
/* Public API */
GtkWidget* gtk_form_new	      	      ();
void	   gtk_form_constrain	      (GtkForm	        *form,
				       GtkWidget        *child,
				       GtkFormEdge	 edge,
				       GtkFormAttachment attachment,
				       GtkWidget        *widget,
				       gint	 	 offset);
 
G_END_DECLS
#endif /* __GTK_FORM_H__ */

le code source

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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#include "gtkform.h"
#include <setjmp.h>
#include <stdio.h>
 
const gint HEIGHT = 400;
const gint WIDTH = 200;
 
enum
{
  STATE_RESET,
  STATE_VISITED,
  STATE_DONE
};
 
enum
{
  CHILD_PROP_TOP_ATTACHMENT = 1,
  CHILD_PROP_TOP_WIDGET,
  CHILD_PROP_TOP_OFFSET,
  CHILD_PROP_LEFT_ATTACHMENT,
  CHILD_PROP_LEFT_WIDGET,
  CHILD_PROP_LEFT_OFFSET,
  CHILD_PROP_BOTTOM_ATTACHMENT,
  CHILD_PROP_BOTTOM_WIDGET,
  CHILD_PROP_BOTTOM_OFFSET,
  CHILD_PROP_RIGHT_ATTACHMENT,
  CHILD_PROP_RIGHT_WIDGET,
  CHILD_PROP_RIGHT_OFFSET,
};
 
/* Private data structure */
struct _GtkFormPrivate 
{    
   gint back_color;
   gint normal_liquid_color;
   gint alert_liquid_color;
   gint trait_color;
   gint air_color;
   gint width;
   gint threshold_low;
   float jauge;
 
   GdkWindow *window;
};
 
static void gtk_form_class_init    (GtkFormClass  *klass);
static void gtk_form_init	    (GtkForm	    *form);
static void gtk_form_finalize	    (GObject	    *object);
static void gtk_form_size_request  (GtkWidget	    *widget,
				     GtkRequisition *requisition);
static void gtk_form_size_allocate (GtkWidget	    *widget,
				     GtkAllocation  *allocation);
static void gtk_form_add	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_remove	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_forall	    (GtkContainer   *container,
				     gboolean	     include_internals,
				     GtkCallback     callback,
				     gpointer	     callback_data);
static void gtk_form_set_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     const GValue   *value,
				     GParamSpec     *pspec);
static void gtk_form_get_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     GValue         *value,
				     GParamSpec     *pspec);
static GType gtk_form_child_type (GtkContainer   *container);
 
 
static void gtk_form_layout	   (GtkForm	   *form,
				    gint	   *my_bounds,
				    gboolean	    recompute_our_size);
static void gtk_form_layout_child  (jmp_buf	    env,
				    GtkFormChild   *fc,
				    gint           *my_bounds,
				    gboolean	    recompute_our_size);
static gint gtk_form_layout_edge   (jmp_buf         env,
				    GtkFormChild   *fc,
				    gint            edge,
				    gint           *my_bounds,
				    gboolean        recompute_our_size);
static void gtk_form_move_edge     (jmp_buf         env,
                                    GtkFormChild   *fc,
				    int             edge,
				    int             where,
				    gint           *my_bounds,
				    gboolean        recompute);
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc,
						gint edge);
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height);
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width);
static void gtk_form_realize(GtkWidget *widget);
 
static GtkContainerClass *parent_class = NULL;
 
 
/* define la variable GTK_TYPE_FORM contient la fonction  de type Gtype de la class */
#define GTK_TYPE_FORM gtk_form_get_type()
 
/* Define type */
G_DEFINE_TYPE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
/** signification des paramètres pour G_DEFINE_TYPE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
 * GtkForm est le type
 * le même préfixe GtkForm que pour la classe GtkFormClass
 * gtk_form sert l'implementation de la fonction (gtk_form)_get_type 
 * GTK_TYPE_WIDGET est le Gtype du widget parent define a parent class pointer accessible from the whole .c file
 **/
 
static GType gtk_form_attachment_get_type(void)
{
  static GType etype = 0;
  if (etype == 0) {
    static const GEnumValue values[] = {
      { GTK_FORM_ATTACH_NONE, "GTK_FORM_ATTACH_NONE", "none" },
      { GTK_FORM_ATTACH_FORM, "GTK_FORM_ATTACH_FORM", "form" },
      { GTK_FORM_ATTACH_WIDGET, "GTK_FORM_ATTACH_WIDGET", "widget" },
      { GTK_FORM_ATTACH_OPPOSITE_WIDGET, "GTK_FORM_ATTACH_OPPOSITE_WIDGET", "opposite_widget" },
      { GTK_FORM_ATTACH_CENTER, "GTK_FORM_ATTACH_CENTER", "center" },
	  { GTK_FORM_ATTACH_SELF, "GTK_FORM_ATTACH_SELF", "self" },
      { 0, NULL, NULL }
    };
	etype = g_enum_register_static ("GtkFormAttachment", values);
  }
  return etype;
}
#define GTK_TYPE_FORM_ATTACHMENT (gtk_form_attachment_get_type())
 
static void gtk_form_class_init (GtkFormClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
	GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 
	parent_class = g_type_class_peek_parent (klass);
 
	object_class->finalize = gtk_form_finalize;
 
	widget_class->size_allocate = gtk_form_size_allocate;
 
	widget_class->get_preferred_width = gtk_form_get_preferred_width;
	widget_class->get_preferred_height = gtk_form_get_preferred_height; 
 
	widget_class->realize = gtk_form_realize;
 
	container_class->add = gtk_form_add;
	container_class->remove = gtk_form_remove;
	container_class->forall = gtk_form_forall;
	container_class->child_type = gtk_form_child_type;
 
	container_class->set_child_property = gtk_form_set_child_property;
	container_class->get_child_property = gtk_form_get_child_property;
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_ATTACHMENT,
						g_param_spec_enum ("top_attachment",
							"Top attachment",
							"Type of attachment of top edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_WIDGET,
						g_param_spec_object ("top_widget",
							"Top widget",
							"Target widget for top edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_OFFSET,
						g_param_spec_uint ("top_offset",
							"Top offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_ATTACHMENT,
						g_param_spec_enum ("left_attachment",
							"Left attachment",
							"Type of attachment of left edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_WIDGET,
						g_param_spec_object ("left_widget",
							"Left widget",
							"Target widget for left edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_OFFSET,
						g_param_spec_uint ("left_offset",
							"Left offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_ATTACHMENT,
						g_param_spec_enum ("bottom_attachment",
							"Bottom attachment",
							"Type of attachment of bottom edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_WIDGET,
						g_param_spec_object ("bottom_widget",
							"Bottom widget",
							"Target widget for bottom edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_OFFSET,
						g_param_spec_uint ("bottom_offset",
							"Bottom offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_ATTACHMENT,
						g_param_spec_enum ("right_attachment",
							"Right attachment",
							"Type of attachment of right edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_WIDGET,
						g_param_spec_object ("right_widget",
							"Right widget",
							"Target widget for right edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_OFFSET,
						g_param_spec_uint ("right_offset",
							"Right offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
}
 
static GType gtk_form_child_type (GtkContainer   *container)
{
  return GTK_TYPE_WIDGET;
}
 
static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
	GList *list;
	for (list = form->children; list; list = list->next)
	{
		GtkFormChild *form_child = list->data;
		if (form_child->widget == widget)
			return form_child;
	}
	return NULL;
}
 
static void gtk_form_set_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			const GValue *value,
			GParamSpec   *pspec)
{
  GtkForm *form = GTK_FORM(container);
  GtkFormChild *form_child;
 
  form_child = gtk_form_find_child (form, child);
  if (!form_child) {
	GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    return;
  }
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_TOP].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_TOP_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_TOP].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_TOP_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_TOP].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_LEFT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_LEFT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_BOTTOM_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_RIGHT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].offset = g_value_get_uint(value);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_get_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			GValue       *value,
			GParamSpec   *pspec)
{
  GtkForm *form = GTK_FORM(container);
  GtkFormChild *form_child = gtk_form_find_child (form, child);
 
  if (!form_child) {
	GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    return;
  }
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_TOP].attachment);
	break;
  case CHILD_PROP_TOP_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_TOP].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_TOP].child) : NULL);
    break;
  case CHILD_PROP_TOP_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_TOP].offset);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_LEFT].attachment);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_LEFT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_LEFT].child) : NULL);
    break;
  case CHILD_PROP_LEFT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_LEFT].offset);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].attachment);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_BOTTOM].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_BOTTOM].child) : NULL);
    break;
  case CHILD_PROP_BOTTOM_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].offset);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_RIGHT].attachment);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_RIGHT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_RIGHT].child) : NULL);
    break;
  case CHILD_PROP_RIGHT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_RIGHT].offset);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_init (GtkForm *form)
{
	#ifdef CB_TEST
		g_print ("gtk_form_init\n");
	#endif
	GtkFormPrivate *priv = G_TYPE_INSTANCE_GET_PRIVATE(form, GTK_TYPE_FORM, GtkFormPrivate);
 
	gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
 
 
	form->priv = priv;
 
 
	gtk_widget_set_has_window(GTK_WIDGET(form), FALSE);
	gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), FALSE);
 
	form->children = NULL;
}
 
GtkWidget* gtk_form_new ()
{
	#ifdef CB_TEST
		g_print ("instance gtk_form_new créé\n");
	#endif
	return GTK_WIDGET (g_object_new (GTK_TYPE_FORM, NULL));
}
 
void gtk_form_constrain (GtkForm	     *form,
		    GtkWidget	     *child,
		    GtkFormEdge       edge,
		    GtkFormAttachment attachment,
		    GtkWidget        *widget,
		    gint              offset)
{
	GtkFormChild *form_child;
 
	g_return_if_fail (form != NULL);
	g_return_if_fail (GTK_IS_FORM (form));
	g_return_if_fail (child != NULL);
	g_return_if_fail (GTK_IS_WIDGET (child));
 
	form_child = gtk_form_find_child (form, child);
	if (!form_child)
	return;
	#ifdef CB_TEST
		g_print ("gtk_form_constrain en action \n");
	#endif
 
	form_child->constraints[edge].location = 0;
	form_child->constraints[edge].attachment = attachment;
	form_child->constraints[edge].offset = offset;
	form_child->constraints[edge].child = gtk_form_find_child (form, widget);
 
	// pourquoi un child (ex un button ) aurait-il automatiquement un parent ?
	//if (gtk_widget_get_visible (child->parent) /* && GTK_WIDGET_VISIBLE (child) */ )
	//{
		//if (gtk_widget_get_mapped (child->parent))
			//gtk_widget_map (child);
 
		//gtk_widget_queue_resize (child);
	//}
	gtk_widget_map (child);
	gtk_widget_queue_resize (child);
}
 
static void gtk_form_finalize (GObject *object)
{
	g_return_if_fail (object != NULL);
	g_return_if_fail (GTK_IS_FORM (object));
 
	//GtkForm *form = GTK_FORM (object);
 
	G_OBJECT_CLASS (parent_class)->finalize (object);
	//G_OBJECT_CLASS (parent_class)->finalize (form);
}
 
static void gtk_form_size_request(GtkWidget *widget, GtkRequisition *requisition) 
{
	/** nous stockons la taille préférée de notre widget, cette fonction ne sert qu'a cela
         * mais requisition sera par la suite consulté **/
	g_return_if_fail (widget != NULL);
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (requisition != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_size_request\n");
	#endif	
	requisition->width  = WIDTH;
	requisition->height = HEIGHT;
}
 
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
	/** la fonction établit une largeur   xxxxx   **/
	g_return_if_fail (widget != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_width\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_width = *natural_width = requisition.width;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].location =
		child->constraints [GTK_FORM_EDGE_LEFT].location +
		minimum_size.width - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.width = my_bounds [GTK_FORM_EDGE_RIGHT] + 1;
	requisition.width += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
	/** la fonction établit une hauteur   xxxxx   **/
	g_return_if_fail (widget != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_height\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_height = *natural_height = requisition.height;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].location =
		child->constraints [GTK_FORM_EDGE_TOP].location +
		minimum_size.height - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.height = my_bounds [GTK_FORM_EDGE_BOTTOM] + 1;
	requisition.height += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
	GtkForm *form;
	GList *children;
	gint my_bounds [4];
 
	g_return_if_fail (widget != NULL);
	g_return_if_fail (GTK_IS_FORM (widget));
	g_return_if_fail (allocation != NULL);
 
	#ifdef CB_TEST
		g_print ("gtk_form_size_allocate en action \n");
	#endif
	gtk_widget_set_allocation(widget, allocation);
	form = GTK_FORM (widget);
	g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__); 
 
	my_bounds [GTK_FORM_EDGE_TOP] = 0 ;
	my_bounds [GTK_FORM_EDGE_LEFT] = 0 ;
	my_bounds [GTK_FORM_EDGE_BOTTOM] = my_bounds [GTK_FORM_EDGE_TOP] +
					 allocation->height - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
	my_bounds [GTK_FORM_EDGE_RIGHT] = my_bounds [GTK_FORM_EDGE_LEFT] +
					allocation->width - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
 
	gtk_form_layout (form, my_bounds, 0);
 
	GtkAllocation allocation_form;
 
	gtk_widget_get_allocation(GTK_WIDGET (form),&allocation_form);
 
	g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
		GtkAllocation allocation;
 
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.x = child->constraints [GTK_FORM_EDGE_LEFT].location +
				allocation_form.x + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.y = child->constraints [GTK_FORM_EDGE_TOP].location +
				allocation_form.y + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.width = child->constraints [GTK_FORM_EDGE_RIGHT].location -
				 child->constraints [GTK_FORM_EDGE_LEFT].location + 1;
		allocation.height = child->constraints [GTK_FORM_EDGE_BOTTOM].location -
				  child->constraints [GTK_FORM_EDGE_TOP].location + 1;
 
		gtk_widget_size_allocate (child->widget, &allocation);
	}
}
 
static void gtk_form_add (GtkContainer *container, GtkWidget    *widget)
{
  GtkForm *form;
  GtkFormChild *form_child;
  gint i;
 
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_FORM (container));
  g_return_if_fail (widget != NULL);
  // ? g_return_if_fail (widget->parent == NULL);
  #ifdef CB_TEST
		g_print ("gtk_form_add en action \n");
	#endif
  form = GTK_FORM (container);
 
  form_child = g_new (GtkFormChild, 1);
  form_child->widget = widget;
 
  for (i = 0; i < 4; i ++)
  {
    form_child->constraints[i].location = 0;
    form_child->constraints[i].attachment = GTK_FORM_ATTACH_NONE;
    form_child->constraints[i].offset = 0;
    form_child->constraints[i].factor = i < 2 ? 1 : -1;
    form_child->constraints[i].state = STATE_RESET;
    form_child->constraints[i].child = NULL;
    form_child->constraints[i].lower_container_relative = FALSE;
    form_child->constraints[i].fraction = 1.0;
  }
 
  form->children = g_list_prepend (form->children, form_child);
 
  gtk_widget_set_parent (widget, GTK_WIDGET (form));
}
 
static void gtk_form_remove (GtkContainer *container,
		  GtkWidget    *widget)
{
  GtkForm *form;
  GtkFormChild *child;
  GList *children;
 
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_FORM (container));
  g_return_if_fail (widget != NULL);
 
  form = GTK_FORM (container);
  children = form->children;
 
  while (children)
    {
      child = children->data;
      children = children->next;
 
      if (child->widget == widget)
	{
	  gtk_widget_unparent (widget);
 
	  form->children = g_list_remove (form->children, child);
	  g_free (child);
 
	  if (gtk_widget_get_visible (GTK_WIDGET (container)))
	    gtk_widget_queue_resize (GTK_WIDGET (container));
	  break;
	}
    }
}
 
static void gtk_form_forall (GtkContainer *container,
		  gboolean	include_internals,
		  GtkCallback	callback,
		  gpointer	callback_data)
{
  GtkForm *form;
  GtkFormChild *child;
  GList *children;
 
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_FORM (container));
  g_return_if_fail (callback != NULL);
 
  form = GTK_FORM (container);
  children = form->children;
 
  while (children)
    {
      child = children->data;
      children = children->next;
 
      (* callback) (child->widget, callback_data);
    }
}
 
static void gtk_form_layout (GtkForm *form, gint *my_bounds, gboolean recompute_our_size)
{
    int count;
    for (count = 0; count < 10000; )
    {
        GList *list;
	gboolean it_worked = 1;
 
	/** Reset the state of all edges. **/
 
	for (list = form->children; list; list = list->next)
	{
	    int edge;
	    GtkFormChild *form_child = list->data;
 
	    for (edge = 0; edge < 4; edge ++)
	        form_child->constraints [edge].state = STATE_RESET;
	}
 
	for (list = form->children; list; list = list->next)
	{
	    GtkFormChild *form_child = list->data;
 
	    jmp_buf env;
 
	    if (setjmp (env) == 0)
		gtk_form_layout_child (env, form_child, my_bounds,
				       recompute_our_size);
	    else
	    {
		it_worked = 0;
		count ++;
		break;
	    }
	}
 
	if (it_worked)
	    break;
    }
}
 
static void gtk_form_layout_child (jmp_buf env, GtkFormChild *fc, gint *my_bounds,
		       gboolean recompute_our_size)
{
    gint edge;
    for (edge = 0; edge < 4; edge ++)
	gtk_form_layout_edge (env, fc, edge, my_bounds, recompute_our_size);
}
 
static gint gtk_form_layout_edge (jmp_buf env, GtkFormChild *fc, gint edge,
		      gint *my_bounds, gboolean recompute_our_size)
{
    GtkFormConstraint *ec = &fc->constraints [edge];
 
    if (ec->state != STATE_DONE)
    {
	if (ec->state == STATE_VISITED)
	    printf ("FormLayout.layout: Circular dependency!\n");
	else
	{
	    gint location = 0;
 
	    ec->state = STATE_VISITED;
 
	    /*
	     * At this point, we can do the work.
	     */
 
	    switch (ec->attachment)
	    {
		case GTK_FORM_ATTACH_SELF:
			if ( !recompute_our_size ) {
				location = (int)(my_bounds [edge] * ec->fraction);
				break ;
			}
			/* if computing size fall through to NONE */
 
		case GTK_FORM_ATTACH_NONE:
			location = ec->location;
			ec->offset = 0;
 
			/*
			 * Edges that don't have attachmenta are now
			 * treated as if they were attached relative to the
			 * opposite edge.  This lets us propagate the value
			 * for lower_container_relative.  Since it is possible
			 * that the opposite edge depends on this edge, we
			 * need to catch the circular dependency first.
			 */
 
			if ( fc->constraints[edge^2].state != STATE_VISITED ) {
				gtk_form_layout_edge(env, fc, edge^2, my_bounds,
									recompute_our_size);
				location = ec->location ;
			}
			ec->lower_container_relative = 
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_FORM:
		    location = my_bounds [edge];
			ec->lower_container_relative =
					edge == GTK_FORM_EDGE_BOTTOM ||
					edge == GTK_FORM_EDGE_RIGHT ;
		    break;
 
		case GTK_FORM_ATTACH_WIDGET:
		    location = ec->factor +	/* This IS correct */
			       gtk_form_layout_edge (env, ec->child,
						     edge ^ 2, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_OPPOSITE_WIDGET:
		    location = gtk_form_layout_edge (env, ec->child,
						     edge, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_CENTER:
		{
		    gint center;
		    gint size;
 
		    if (ec->child == NULL)	/* Center on form */
		    {
			center = (my_bounds [edge ^ 2] -
				  my_bounds [edge]) / 2;
			if (center < 0) center = -center;
		    }
		    else
		    {
		        gint edge1;
		        gint edge2;
		        gint half;
 
			gtk_form_layout_edge (env, ec->child,
					      edge ^ 2, my_bounds,
					      recompute_our_size);
 			gtk_form_layout_edge (env, ec->child,
					      edge, my_bounds,
					      recompute_our_size);
 
			/* It might be tempting to use the return of
			 * gtk_form_layout_edge rather than the next 2 lines
			 * of code.  Bad idea because the second call to
			 * gtk_form_layout_edge may move the first edge.
			 */
 
			edge1 = ec->child->constraints [edge^2].location;
			edge2 = ec->child->constraints [edge].location;
			half = (edge1 - edge2) / 2;
			center = ec->child->constraints [edge].location +
				 half;
		    }
 
		    /* We depend on the opposite edge so lets lay him out
		     * first.
			 */
 
		    gtk_form_layout_edge (env, fc, edge ^ 2, my_bounds,
					    recompute_our_size);
 
		    size = fc->constraints [edge ^ 2].location -
			       fc->constraints [edge].location + 1;
 
		    location = center - size / 2;
 
		    break;
		}
 
		default:
		    printf ("FormLayout: Unknown attachment type!\n");
	    }
 
	    location += ec->offset * ec->factor;
 
	    gtk_form_move_edge (env, fc, edge, location, my_bounds,
				recompute_our_size && ec->lower_container_relative);
 
	    ec->state = STATE_DONE;
	}
    }
 
    return fc->constraints [edge].location;
}
 
static void gtk_form_move_edge (jmp_buf env, GtkFormChild *fc, int edge, int where,
		    gint *my_bounds, gboolean recompute)
{
    int diff = where - fc->constraints [edge].location;
 
    int opposite_edge = edge ^ 2;
 
    if (gtk_form_edge_should_move_too (fc, opposite_edge))
	fc->constraints [opposite_edge].location += diff;
    else
    {
	/* Special Case:  If we are in "recompute" mode and we shrink
	 * because of this constraint, then we need to expand the form
	 * to accomodate us instead of shrinking the child.
	 */
 
	if (recompute)
	{
	    int delta = diff * fc->constraints [opposite_edge].factor;
 
	    if (delta < 0)
	    {
		if (edge == GTK_FORM_EDGE_TOP || edge == GTK_FORM_EDGE_BOTTOM)
		    my_bounds [GTK_FORM_EDGE_BOTTOM] += -delta;
		else
		    my_bounds [GTK_FORM_EDGE_RIGHT] += -delta;
 
		longjmp (env, 1);
	    }
	}
    }
 
    fc->constraints [edge].location += diff;
}
 
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc, gint edge)
{
    /* Should edge move if the opposite edge moves.  e.g. If the LEFT
     * edge moves 10 pixels, should the RIGHT edge move too?
	 *
     * Simply stated, an edge can move if there are no constraints for
     * that edge or the constraints for that edge are relative to itself
     * (specifies a width) or the edge has not been layed out yet.
	 */
 
    int attachment = fc->constraints [edge].attachment;
 
    return (attachment == GTK_FORM_ATTACH_NONE) ||
	   (fc->constraints [edge].state != STATE_DONE) ||
	   (attachment == GTK_FORM_ATTACH_WIDGET &&
	    fc->constraints [edge].child == fc);
}
 
static void gtk_form_realize(GtkWidget *widget) 
{
	/** cette fonction est au coeur du dispositif c'est ici que la fenêtre est créé
         * avec les bonnes dimensions
         * notamment  la couche de dessin est préparé avec le contexte cairo
         * et le format de dessin classique
         **/
	g_return_if_fail (widget != NULL);
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtkform_realize\n");
	#endif
	GtkFormPrivate *priv = GTK_FORM(widget)->priv;
	GtkAllocation allocation;
	GdkWindowAttr attrs;
	guint attrs_mask;
 
	gtk_widget_set_realized(widget, TRUE);
 
	gtk_widget_get_allocation(widget, &allocation);
 
	attrs.x           = allocation.x;
	attrs.y           = allocation.y;
	attrs.width       = allocation.width;
	attrs.height      = allocation.height;
	attrs.window_type = GDK_WINDOW_CHILD;
	attrs.wclass      = GDK_INPUT_OUTPUT;
	attrs.event_mask  = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;
 
	attrs_mask = GDK_WA_X | GDK_WA_Y;
 
	priv->window = gdk_window_new(gtk_widget_get_parent_window(widget),
			   &attrs, attrs_mask);
	gdk_window_set_user_data(priv->window, widget);
	gtk_widget_set_window(widget, priv->window);
 
	/**widget->style = gtk_style_attach(gtk_widget_get_style( widget ),
                                                         priv->window);
        //gtk_style_set_background(widget->style, priv->window, GTK_STATE_NORMAL);**/
	GtkStyleContext * context = gtk_style_context_new ();
 
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 500,500);
	cairo_t *cairo = cairo_create (surface);
	gtk_render_background (context,
                       cairo,
                       allocation.x,
                       allocation.y,
                       allocation.width,
                       allocation.height);  
}

et pour finir le code de test form.c

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#include <gtk/gtk.h>
#include "gtkform.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
/* Our callback.
 * The data passed to this function is printed to stdout */
void callback( GtkWidget *widget,
               gpointer   data )
{
    g_print ("Hello again - %s was pressed\n", (char *) data);
}
 
/* This callback quits the program */
gint delete_event( GtkWidget *widget,
                   GdkEvent  *event,
                   gpointer   data )
{
    gtk_main_quit ();
    return FALSE;
}
 
int main( int   argc,
          char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button1;
    GtkWidget *button2;
    GtkWidget *button3;
    GtkWidget *button4;
    GtkWidget *quit;
    GtkWidget *form;
	int c ;
	guint width = 0 ;
	guint fwidth = 0 ;
	gboolean self = FALSE ;
 
    gtk_init (&argc, &argv);
 
	while ( (c=getopt(argc, argv, "b:B:s")) != EOF ) {
		switch (c) {
		case 'b' :
			fwidth = atoi(optarg) ;
			break ;
		case 'B' :
			width = atoi(optarg) ;
			break ;
		case 's' :
			self = TRUE ;
			break ;
		default :
			fprintf(stderr, "usage: form [-b n] [-B n] [-s]\n") ;
			fprintf(stderr, "   -b n    border width of form\n") ;
			fprintf(stderr, "   -B n    border width of window\n") ;
			fprintf(stderr, "   -s      make self attachments\n") ;
			return 1 ;
		}
	}
 
    /* Create a new window */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 
    /* Set the window title */
    gtk_window_set_title (GTK_WINDOW (window), "Table");
 
    /* Set a handler for delete_event that immediately
     * exits GTK. */
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (delete_event), NULL);
 
    /* Sets the border width of the window. */
    gtk_container_set_border_width (GTK_CONTAINER (window), width);
 
    /* Create a form */
    form = gtk_form_new ();
 
    /* Put the form in the main window */
    gtk_container_add (GTK_CONTAINER (window), form);
    gtk_container_set_border_width (GTK_CONTAINER (form), fwidth);
 
    /* Create first button */
    button1 = gtk_button_new_with_label ("button 1");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 1" as its argument */
    g_signal_connect (G_OBJECT (button1), "clicked",
	              G_CALLBACK (callback), (gpointer) "button 1");
 
 
    /* Insert button 1 into the upper left quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button1);
    gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
 
    gtk_widget_show (button1);
 
    /* Create second button */
 
    button2 = gtk_button_new_with_label ("button 2");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button2), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 2");
 
    /* Insert button 2 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button2);
    gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button1, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
 
    gtk_widget_show (button2);
 
    /* Create third button */
 
    button3 = gtk_button_new_with_label ("button 3");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button3), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 3");
 
    /* Insert button 3 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button3);
    gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button2, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
 
    gtk_widget_show (button3);
 
    /* Create fourth button */
 
    button4 = gtk_button_new_with_label ("button 4");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button4), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 4");
 
    /* Insert button 4 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button4);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button3, 0);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
 
    gtk_widget_show (button4);
 
    /* Create "Quit" button */
    quit = gtk_button_new_with_label ("Quit");
 
    /* When the button is clicked, we call the "delete_event" function
     * and the program exits */
    g_signal_connect (G_OBJECT (quit), "clicked",
                      G_CALLBACK (delete_event), NULL);
 
    /* Insert the quit button into the
     * lower half of the form */
 
	gtk_container_add(GTK_CONTAINER(form), quit);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_WIDGET, button1, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_FORM, NULL, 0);
 
    gtk_widget_show (quit);
    gtk_widget_show (form);
    gtk_widget_show (window);
 
    gtk_main ();
 
    return 0;
}

et le fichier mesonbuild

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project('mygtkform', 'c')
gtkdep = dependency('gtk+-3.0')
cc = meson.get_compiler('c')
math_dep = cc.find_library('m', required : false)
scr= [ 'gtkform.c','form.c','gtkform.h']
executable('form', scr, dependencies : [math_dep,gtkdep])

les symptômes : une fois compilé, à l’exécution l'affichage apparaît de temps en temps et il y a beaucoup d'erreur d’exécution. Le traçage m'oriente à minima vers des coquilles dans gtk_form_constrain...

Avez-vous une idée de ce qui manque pour terminer l'affaire SVP?

Merci d'avance pour vos éclairages

**gerald3d** · 27/03/2020, 10h41

Bonjour turboiii.

Comme j'ai du temps, comme tu peux l'imaginer, je me plonge corps et âme dans ton problème

.

Après une première lecture, je vois que tu utilises G_DEFINE_TYPE() pour définir ton objet. Pourquoi pas ? Cependant tu as aussi une structure private pour cet objet. Il conviendrait mieux alors d'utiliser G_DEFINE_TYPE_WITH_PRIVATE(). Ainsi le pointeur interne priv sera directement initialisé.
Pour pouvoir utiliser tout ce petit monde correctement il faut que toutes les déclarations des structures soient faites dans le header.
Dernière remarque. Puisque il y a une structure privée la liste children doit en faire partie.
Voici le header modifié :

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#ifndef __GTK_FORM_H__
#define __GTK_FORM_H__

#include <gtk/gtk.h>

G_BEGIN_DECLS

#define CB_TEST

/* define la variable GTK_TYPE_FORM contient la fonction  de type Gtype de la class */
#define GTK_TYPE_FORM gtk_form_get_type ()

G_DECLARE_FINAL_TYPE (GtkForm, gtk_form, GTK, FORM, GtkContainer)
/** signification des paramètres
 * le préfixe GtkForm pour la classe GtkFormClass
 * gtk_form pour définir le type gtk_form_get_type()
 * le transtypage GTK_FORM
 * l'ancêtre GtkContainer
 **/
 
typedef struct _GtkFormChild	  GtkFormChild;
typedef struct _GtkFormConstraint GtkFormConstraint;
 
typedef enum
  {
   GTK_FORM_ATTACH_NONE,
   GTK_FORM_ATTACH_FORM,
   GTK_FORM_ATTACH_WIDGET,
   GTK_FORM_ATTACH_OPPOSITE_WIDGET,
   GTK_FORM_ATTACH_CENTER,
   GTK_FORM_ATTACH_SELF
  } GtkFormAttachment;
 
typedef enum
  {
   /* N O T E:  These numbers ARE NOT ARBITRARY!! */
   GTK_FORM_EDGE_TOP = 0,
   GTK_FORM_EDGE_LEFT = 1,
   GTK_FORM_EDGE_BOTTOM = 2,
   GTK_FORM_EDGE_RIGHT = 3
  } GtkFormEdge;
 
 
/* Type definition */
typedef struct _GtkFormPrivate GtkFormPrivate;
 
struct _GtkForm
{
  GtkContainer parent;

  /*< Private >*/
  GtkFormPrivate *priv;
};

/* Private data structure */
struct _GtkFormPrivate 
{
  GList *children;
  gint back_color;
  gint normal_liquid_color;
  gint alert_liquid_color;
  gint trait_color;
  gint air_color;
  gint width;
  gint threshold_low;
  float jauge;
 
  GdkWindow *window;
};

struct _GtkFormClass
{
  GtkContainerClass parent_class;
};
 
struct _GtkFormConstraint
{
  gint location;
  gint attachment;
  gint offset;
  gint factor;
  gint state;
  gboolean lower_container_relative;
  GtkFormChild *child;
  gfloat fraction;
};
 
struct _GtkFormChild
{
  GtkWidget *widget;
  GtkFormConstraint constraints [4];
};
 
/* Public API */
GtkWidget* gtk_form_new	      	      ();
void	   gtk_form_constrain	      (GtkForm	        *form,
				       GtkWidget        *child,
				       GtkFormEdge	 edge,
				       GtkFormAttachment attachment,
				       GtkWidget        *widget,
				       gint	 	 offset);
 
G_END_DECLS
#endif /* __GTK_FORM_H__ */

Bien entendu ces modifications vont avoir une incidence importante sur le code source.

Tout d'abord nous définissons le type privé. Pas grand chose à dire de plus ici :

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G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)

Dans gtk_form_init (); nous allons utiliser gtk_form_get_instance_private(); en lieu et place de G_TYPE_INSTANCE_GET_PRIVATE() qui est obsolète.

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static void gtk_form_init (GtkForm *form)
{
#ifdef CB_TEST
  g_print ("gtk_form_init\n");
#endif
 
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);
  priv->children = NULL;
  ...
}

Comme tu peux le voir j'initialise ici children puisqu'elle fait partie de la structure privée maintenant.
Dans la foulée il faut ici initialiser toutes les données de la structure privée. Ce qui pourrait donner :

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  priv->children            = NULL;
  priv->back_color          = 0;
  priv->normal_liquid_color = 0;
  priv->alert_liquid_color  = 0;
  priv->trait_color         = 0;
  priv->air_color           = 0;
  priv->width               = 0;
  priv->threshold_low       = 0;
  priv->jauge               = 0;
  priv->window              = NULL;

Je n'ai pas encore regardé à quoi servent toutes ces données. Je suis donc parti du principe de les initialiser en fonction de leur type.

Avant de clôturer ce premier post une dernière remarque qui vaut pour toutes les fonctions internes à l'objet.
Prenons pour exemple cette fonction :

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static void gtk_form_size_request(GtkWidget *widget, GtkRequisition *requisition) 
{
	/** nous stockons la taille préférée de notre widget, cette fonction ne sert qu'a cela
         * mais requisition sera par la suite consulté **/
	g_return_if_fail (widget != NULL);
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (requisition != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_size_request\n");
	#endif	
	requisition->width  = WIDTH;
	requisition->height = HEIGHT;
}

Il faut tester tous les paramètres en entrée. Ce que tu fais ici. Mais ce n'est pas le cas pour toutes. A faire donc. Je vais pousser un peu la forme des tests.
Tester si widget est NULL puis ensuite tester ce même widget s'il est de type GtkForm n'est pas très optimisé. Le fait de tester si widget est de type GtkForm est largement suffisant puisque si widget est NULL il n'est pas de type GtkForm non plus. Tu peux donc supprimer le premier test.

Dernier exemple sur cette fonction :

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static void gtk_form_layout (GtkForm *form, gint *my_bounds, gboolean recompute_our_size)
{
    int count;
    for (count = 0; count < 10000; )
    {
        GList *list;
    ...

Ici il n'y a aucun test !

Je te laisse prendre ce que tu veux dans toutes ses remarques.

P.S. :

Histoire d'enfoncer le clou

une dernière fonction pour te montrer les modifications nécessaires après tout ce que j'ai écrit :

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static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
  GList *list;
  for (list = form->children; list; list = list->next)
    {
      GtkFormChild *form_child = list->data;
      if (form_child->widget == widget)
	return form_child;
    }
  return NULL;
}

Cette fonction prendra la forme suivante pour accéder à la liste children et pour tester ses paramètres :

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static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
  g_return_val_if_fail (GTK_IS_FORM (form), NULL);
  if (!widget) return;  /* Ce n'est pas une erreur si widget est NULL. Donc pas de warning en console */
  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL); /* Si widget n'est pas un GtkWidget alors c'est une erreur */
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
  GList *list = priv->children;
  GtkFormChild *form_child;
  while (list) {
    form_child = list->data;
    if (form_child->widget == widget)
      return form_child;
    list = g_list_next (list);
  }
 
  return NULL;
}

Bon codage.

Gérald

**turboiii** · 28/03/2020, 09h03

hello

Ok merci Gérald pour ta réponse très riche. Ce code hérite des défauts émis par le concepteur initial sans oublier les bourdes de j'ai rajouté ou bien mes oublis.

Je vais étudier toutes tes remarques. Merci encore

**gerald3d** · 28/03/2020, 09h23

J'ai quelques peu modifié le code source depuis pour obtenir quelque chose d'utilisable. Il est encore perfectible mais il est stable et fonctionnel.
Je ne le poste pas pour le moment te laissant le loisir de creuser de ton côté.

Voila ce que j'obtiens graphiquement :
Nom : Capture d’écran_2020-03-28_09-22-25.png
Affichages : 189
Taille : 12,6 Ko

Nom : Capture d’écran_2020-03-28_09-22-25.png
Affichages : 189
Taille : 12,6 Ko

Tous les widgets sont bien entendu fonctionnels.

**turboiii** · 28/03/2020, 10h57

hello Gerald

je vois que que tu as réussi à en faire quelque chose de ce machin. Effectivement je suis en train de faire la mise à niveau. mais c'est pas encore au point

**turboiii** · 28/03/2020, 11h32

suite

dans le fichier de test j'ai remplacé les multiples gtk_widget_show(foo); par une commande unique et bien plus efficace gtk_widget_show_all(window);

d'autre part voici mon code source en l'état

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#include "gtkform.h"
#include <setjmp.h>
#include <stdio.h>
 
const gint HEIGHT = 400;
const gint WIDTH = 200;
 
enum
{
  STATE_RESET,
  STATE_VISITED,
  STATE_DONE
};
 
enum
{
  CHILD_PROP_TOP_ATTACHMENT = 1,
  CHILD_PROP_TOP_WIDGET,
  CHILD_PROP_TOP_OFFSET,
  CHILD_PROP_LEFT_ATTACHMENT,
  CHILD_PROP_LEFT_WIDGET,
  CHILD_PROP_LEFT_OFFSET,
  CHILD_PROP_BOTTOM_ATTACHMENT,
  CHILD_PROP_BOTTOM_WIDGET,
  CHILD_PROP_BOTTOM_OFFSET,
  CHILD_PROP_RIGHT_ATTACHMENT,
  CHILD_PROP_RIGHT_WIDGET,
  CHILD_PROP_RIGHT_OFFSET,
};
 
 
static void gtk_form_class_init    (GtkFormClass  *klass);
static void gtk_form_init	    (GtkForm	    *form);
static void gtk_form_finalize	    (GObject	    *object);
static void gtk_form_size_request  (GtkWidget	    *widget,
				     GtkRequisition *requisition);
static void gtk_form_size_allocate (GtkWidget	    *widget,
				     GtkAllocation  *allocation);
static void gtk_form_add	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_remove	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_forall	    (GtkContainer   *container,
				     gboolean	     include_internals,
				     GtkCallback     callback,
				     gpointer	     callback_data);
static void gtk_form_set_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     const GValue   *value,
				     GParamSpec     *pspec);
static void gtk_form_get_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     GValue         *value,
				     GParamSpec     *pspec);
static GType gtk_form_child_type (GtkContainer   *container);
 
 
static void gtk_form_layout	   (GtkForm	   *form,
				    gint	   *my_bounds,
				    gboolean	    recompute_our_size);
static void gtk_form_layout_child  (jmp_buf	    env,
				    GtkFormChild   *fc,
				    gint           *my_bounds,
				    gboolean	    recompute_our_size);
static gint gtk_form_layout_edge   (jmp_buf         env,
				    GtkFormChild   *fc,
				    gint            edge,
				    gint           *my_bounds,
				    gboolean        recompute_our_size);
static void gtk_form_move_edge     (jmp_buf         env,
                                    GtkFormChild   *fc,
				    int             edge,
				    int             where,
				    gint           *my_bounds,
				    gboolean        recompute);
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc,
						gint edge);
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height);
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width);
static void gtk_form_realize(GtkWidget *widget);
 
static GtkContainerClass *parent_class = NULL;
 
 
/* Define private type */
G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
/** signification des paramètres pour G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
 * GtkForm est le type
 * le même préfixe GtkForm que pour la classe GtkFormClass
 * gtk_form sert l'implementation de la fonction (gtk_form)_get_type 
 * GTK_TYPE_WIDGET est le Gtype du widget parent define a parent class pointer accessible from the whole .c file
 **/
 
static GType gtk_form_attachment_get_type(void)
{
  static GType etype = 0;
  if (etype == 0) {
    static const GEnumValue values[] = {
      { GTK_FORM_ATTACH_NONE, "GTK_FORM_ATTACH_NONE", "none" },
      { GTK_FORM_ATTACH_FORM, "GTK_FORM_ATTACH_FORM", "form" },
      { GTK_FORM_ATTACH_WIDGET, "GTK_FORM_ATTACH_WIDGET", "widget" },
      { GTK_FORM_ATTACH_OPPOSITE_WIDGET, "GTK_FORM_ATTACH_OPPOSITE_WIDGET", "opposite_widget" },
      { GTK_FORM_ATTACH_CENTER, "GTK_FORM_ATTACH_CENTER", "center" },
	  { GTK_FORM_ATTACH_SELF, "GTK_FORM_ATTACH_SELF", "self" },
      { 0, NULL, NULL }
    };
	etype = g_enum_register_static ("GtkFormAttachment", values);
  }
  return etype;
}
#define GTK_TYPE_FORM_ATTACHMENT (gtk_form_attachment_get_type())
 
static void gtk_form_class_init (GtkFormClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
	GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 
	parent_class = g_type_class_peek_parent (klass);
 
	object_class->finalize = gtk_form_finalize;
 
	widget_class->size_allocate = gtk_form_size_allocate;
 
	widget_class->get_preferred_width = gtk_form_get_preferred_width;
	widget_class->get_preferred_height = gtk_form_get_preferred_height; 
 
	widget_class->realize = gtk_form_realize;
 
	container_class->add = gtk_form_add;
	container_class->remove = gtk_form_remove;
	container_class->forall = gtk_form_forall;
	container_class->child_type = gtk_form_child_type;
 
	container_class->set_child_property = gtk_form_set_child_property;
	container_class->get_child_property = gtk_form_get_child_property;
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_ATTACHMENT,
						g_param_spec_enum ("top_attachment",
							"Top attachment",
							"Type of attachment of top edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_WIDGET,
						g_param_spec_object ("top_widget",
							"Top widget",
							"Target widget for top edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_TOP_OFFSET,
						g_param_spec_uint ("top_offset",
							"Top offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_ATTACHMENT,
						g_param_spec_enum ("left_attachment",
							"Left attachment",
							"Type of attachment of left edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_WIDGET,
						g_param_spec_object ("left_widget",
							"Left widget",
							"Target widget for left edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_LEFT_OFFSET,
						g_param_spec_uint ("left_offset",
							"Left offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_ATTACHMENT,
						g_param_spec_enum ("bottom_attachment",
							"Bottom attachment",
							"Type of attachment of bottom edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_WIDGET,
						g_param_spec_object ("bottom_widget",
							"Bottom widget",
							"Target widget for bottom edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_BOTTOM_OFFSET,
						g_param_spec_uint ("bottom_offset",
							"Bottom offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_ATTACHMENT,
						g_param_spec_enum ("right_attachment",
							"Right attachment",
							"Type of attachment of right edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_WIDGET,
						g_param_spec_object ("right_widget",
							"Right widget",
							"Target widget for right edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_OFFSET,
						g_param_spec_uint ("right_offset",
							"Right offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
}
 
static GType gtk_form_child_type (GtkContainer   *container)
{
  return GTK_TYPE_WIDGET;
}
 
static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
	/** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
	if (widget == NULL)
		g_print (" Warning ici widget est NULL pourquoi ?\n");
	else
		g_print (" Warning ici widget est consistant\n");
	g_return_val_if_fail (GTK_IS_FORM (form), NULL);
	g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GList *list = priv->children;
	GtkFormChild *form_child;
	while (list)
	{
		form_child = list->data;
		if (form_child->widget == widget)
			return form_child;
		list = g_list_next (list);
	}
	// pas de chance pas trouvé !!!
	return NULL;
}
 
static void gtk_form_set_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			const GValue *value,
			GParamSpec   *pspec)
{
	GtkForm *form = GTK_FORM(container);
	GtkFormChild * form_child = gtk_form_find_child (form, child);
 
	if (!form_child)
	{
		g_print (" Warning ici form_child est NULL pourquoi ?\n");
		GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
		return;
	}
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_TOP].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_TOP_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_TOP].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_TOP_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_TOP].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_LEFT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_LEFT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_BOTTOM_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_RIGHT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].offset = g_value_get_uint(value);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_get_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			GValue       *value,
			GParamSpec   *pspec)
{
  GtkForm *form = GTK_FORM(container);
  GtkFormChild *form_child = gtk_form_find_child (form, child);
 
  if (!form_child) {
	GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    return;
  }
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_TOP].attachment);
	break;
  case CHILD_PROP_TOP_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_TOP].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_TOP].child) : NULL);
    break;
  case CHILD_PROP_TOP_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_TOP].offset);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_LEFT].attachment);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_LEFT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_LEFT].child) : NULL);
    break;
  case CHILD_PROP_LEFT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_LEFT].offset);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].attachment);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_BOTTOM].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_BOTTOM].child) : NULL);
    break;
  case CHILD_PROP_BOTTOM_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].offset);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_RIGHT].attachment);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_RIGHT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_RIGHT].child) : NULL);
    break;
  case CHILD_PROP_RIGHT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_RIGHT].offset);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_init (GtkForm *form)
{
	#ifdef CB_TEST
		g_print ("gtk_form_init\n");
	#endif
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	form->priv = priv;
	priv->children            = NULL;
	priv->back_color          = 0;
	priv->normal_liquid_color = 0;
	priv->alert_liquid_color  = 0;
	priv->trait_color         = 0;
	priv->air_color           = 0;
	priv->width               = 0;
	priv->threshold_low       = 0;
	priv->jauge               = 0;
	priv->window              = NULL;
 
	//gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
	gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
	//gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), FALSE);
	gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), TRUE);
}
 
GtkWidget* gtk_form_new ()
{
	#ifdef CB_TEST
		g_print ("instance gtk_form_new créé\n");
	#endif
	return GTK_WIDGET (g_object_new (GTK_TYPE_FORM, NULL));
}
 
void gtk_form_constrain (GtkForm	     *form,
		    GtkWidget	     *child,
		    GtkFormEdge       edge,
		    GtkFormAttachment attachment,
		    GtkWidget        *widget,
		    gint              offset)
{
	/** je suppose ici que une fois gtk_container_add(GTK_CONTAINER(form), widget);
         * a rajouté un widget dans la liste, cette commande permet d'appliquer la contrainte
         * il faut donc le trouver et le traiter
         * transfo utilisation de la structure privée nécessaire **/
	GtkFormChild *form_child;
 
	g_return_if_fail (GTK_IS_FORM (form));
	g_return_if_fail (GTK_IS_WIDGET (child));
 
	// c'est ici qu'on le cherche
	form_child = gtk_form_find_child (form, child);
	if (!form_child)
	return;
	// arrivé ici on l'a sous le coude et on applique les contraintes
	#ifdef CB_TEST
		g_print ("gtk_form_constrain en action widget trouvé\n");
	#endif
 
	form_child->constraints[edge].location = 0;
	form_child->constraints[edge].attachment = attachment;
	form_child->constraints[edge].offset = offset;
	form_child->constraints[edge].child = gtk_form_find_child (form, widget);
	// pourquoi un child (ex un button ) aurait-il automatiquement un parent ?
	//if (gtk_widget_get_visible (child->parent) /* && GTK_WIDGET_VISIBLE (child) */ )
	//{
		//if (gtk_widget_get_mapped (child->parent))
			//gtk_widget_map (child);
 
		//gtk_widget_queue_resize (child);
	//}
 
 
	// je teste l'application des contraintes sur le widget traité via la structure privé???
	if ( gtk_widget_get_visible (form_child->widget))
		if (gtk_widget_get_mapped (form_child->widget))
			gtk_widget_map (form_child->widget);
	gtk_widget_queue_resize (child);
 
}
 
static void gtk_form_finalize (GObject *object)
{
	g_return_if_fail (GTK_IS_FORM (object));
	#ifdef CB_TEST
		g_print ("gtk_form_finalize\n");
	#endif
	GtkFormPrivate *priv = gtk_form_get_instance_private (GTK_FORM (object));
	// a voir si je dois libérer des ressources au moins la Glist?
 
	g_free (priv->children);
 
  /* Always chain up to the parent class; as with dispose(), finalize()
   * is guaranteed to exist on the parent's class virtual function table
   */
 
	G_OBJECT_CLASS (parent_class)->finalize (object);
	//G_OBJECT_CLASS (parent_class)->finalize (form);
}
 
static void gtk_form_size_request(GtkWidget *widget, GtkRequisition *requisition) 
{
	/** nous stockons la taille préférée de notre widget, cette fonction ne sert qu'a cela
         * mais requisition sera par la suite consulté **/
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (requisition != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_size_request\n");
	#endif	
	requisition->width  = WIDTH;
	requisition->height = HEIGHT;
}
 
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
	/** la fonction établit une largeur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_width\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_width = *natural_width = requisition.width;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].location =
		child->constraints [GTK_FORM_EDGE_LEFT].location +
		minimum_size.width - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.width = my_bounds [GTK_FORM_EDGE_RIGHT] + 1;
	requisition.width += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
	/** la fonction établit une hauteur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_height\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_height = *natural_height = requisition.height;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].location =
		child->constraints [GTK_FORM_EDGE_TOP].location +
		minimum_size.height - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.height = my_bounds [GTK_FORM_EDGE_BOTTOM] + 1;
	requisition.height += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
	GtkForm *form;
	GList *children;
	gint my_bounds [4];
 
	g_return_if_fail (GTK_FORM (widget));
	//g_return_if_fail (GTK_IS_FORM (widget));
	g_return_if_fail (allocation != NULL);
 
	#ifdef CB_TEST
		g_print ("gtk_form_size_allocate en action \n");
	#endif
	gtk_widget_set_allocation(widget, allocation);
	form = GTK_FORM (widget);
	g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__); 
 
	my_bounds [GTK_FORM_EDGE_TOP] = 0 ;
	my_bounds [GTK_FORM_EDGE_LEFT] = 0 ;
	my_bounds [GTK_FORM_EDGE_BOTTOM] = my_bounds [GTK_FORM_EDGE_TOP] +
					 allocation->height - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
	my_bounds [GTK_FORM_EDGE_RIGHT] = my_bounds [GTK_FORM_EDGE_LEFT] +
					allocation->width - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
 
	gtk_form_layout (form, my_bounds, 0);
 
	GtkAllocation allocation_form;
 
	gtk_widget_get_allocation(GTK_WIDGET (form),&allocation_form);
 
	g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
		GtkAllocation allocation;
 
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.x = child->constraints [GTK_FORM_EDGE_LEFT].location +
				allocation_form.x + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.y = child->constraints [GTK_FORM_EDGE_TOP].location +
				allocation_form.y + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__);
 
		allocation.width = child->constraints [GTK_FORM_EDGE_RIGHT].location -
				 child->constraints [GTK_FORM_EDGE_LEFT].location + 1;
		allocation.height = child->constraints [GTK_FORM_EDGE_BOTTOM].location -
				  child->constraints [GTK_FORM_EDGE_TOP].location + 1;
 
		gtk_widget_size_allocate (child->widget, &allocation);
	}
}
 
static void gtk_form_add (GtkContainer *container, GtkWidget    *widget)
{
	/** pour moi c'est ici que la commande gtk_container_add(GTK_CONTAINER(form), widget);
         * va entrer en action par subtitution/complément de gtk_container_add
         * notamment rajouter l'enfant à la liste privée
         **/
 
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (widget != NULL);
	/** je comprend avec la commande si dessous que si le wiget a déjà un parent
         * cela va être difficile de le sortir de l'autre structure pour le coller va générer un conflit
         **/
	//g_return_if_fail (widget->parent == NULL);
	// nouvelle commande plus adpter au contexte en gtk3 ????
	// g_return_if_fail (gtk_widget_get_parent_window(widget)); est-ce utile à ce stade du dev ???
	#ifdef CB_TEST
		g_print ("gtk_form_add en action \n");
	#endif
	gint i;
 
	GtkForm * form = GTK_FORM (container);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	//création et remplissage de la structure form_child
	GtkFormChild *form_child = g_new (GtkFormChild, 1);
 
	form_child->widget = widget;
 
	for (i = 0; i < 4; i ++)
	{
		form_child->constraints[i].location = 0;
		form_child->constraints[i].attachment = GTK_FORM_ATTACH_NONE;
		form_child->constraints[i].offset = 0;
		form_child->constraints[i].factor = i < 2 ? 1 : -1;
		form_child->constraints[i].state = STATE_RESET;
		form_child->constraints[i].child = NULL;
		form_child->constraints[i].lower_container_relative = FALSE;
		form_child->constraints[i].fraction = 1.0;
	}
	priv->children = g_list_prepend (priv->children, form_child);
	// tient c'est ici qu'on définit que l'enfant à un parent et c'est le container bon ok!!
	/** gtk_widget_set_parent (GtkWidget *widget,
                       GtkWidget *parent);
     * This function is useful only when implementing subclasses of GtkContainer.
     * Sets the container as the parent of widget , and takes care of some details
     * such as updating the state and style of the child to reflect its new location
     **/
	gtk_widget_set_parent (widget, GTK_WIDGET (form));
}
 
static void gtk_form_remove (GtkContainer *container, GtkWidget    *widget)
{
	/** je suppose ici qu'il faut retirer un widget du container initial
         * transfo utilisation de la structure privée nécessaire **/
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (GTK_FORM (widget));
 
	GtkFormChild *child;
	GList *children;
	GtkForm *form = GTK_FORM (container);
 
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	children = priv->children;
 
	while (children)
    {
		child = children->data;
		children = children->next;
 
		if (child->widget == widget)
		{
		  gtk_widget_unparent (widget);
 
		  form->children = g_list_remove (form->children, child);
		  g_free (child);
 
		  if (gtk_widget_get_visible (GTK_WIDGET (container)))
			gtk_widget_queue_resize (GTK_WIDGET (container));
		  break;
		}
    }
}
 
static void gtk_form_forall (GtkContainer *container,
		  gboolean	include_internals,
		  GtkCallback	callback,
		  gpointer	callback_data)
{
  GtkFormChild *child;
  GList *children;
 
  g_return_if_fail (GTK_IS_FORM (container));
  g_return_if_fail (callback != NULL);
 
  GtkForm *form = GTK_FORM (container);
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);
  children = priv->children;
 
  while (children)
    {
      child = children->data;
      children = children->next;
 
      (* callback) (child->widget, callback_data);
    }
}
 
static void gtk_form_layout (GtkForm *form, gint *my_bounds, gboolean recompute_our_size)
{
    int count;
    g_return_if_fail (GTK_FORM (form));
    for (count = 0; count < 10000; )
    {
        GList *list;
	gboolean it_worked = 1;
 
	/** Reset the state of all edges. **/
 
	for (list = form->children; list; list = list->next)
	{
	    int edge;
	    GtkFormChild *form_child = list->data;
 
	    for (edge = 0; edge < 4; edge ++)
	        form_child->constraints [edge].state = STATE_RESET;
	}
 
	for (list = form->children; list; list = list->next)
	{
	    GtkFormChild *form_child = list->data;
 
	    jmp_buf env;
 
	    if (setjmp (env) == 0)
		gtk_form_layout_child (env, form_child, my_bounds,
				       recompute_our_size);
	    else
	    {
		it_worked = 0;
		count ++;
		break;
	    }
	}
 
	if (it_worked)
	    break;
    }
}
 
static void gtk_form_layout_child (jmp_buf env, GtkFormChild *fc, gint *my_bounds,
		       gboolean recompute_our_size)
{
    gint edge;
 
    for (edge = 0; edge < 4; edge ++)
	gtk_form_layout_edge (env, fc, edge, my_bounds, recompute_our_size);
}
 
static gint gtk_form_layout_edge (jmp_buf env, GtkFormChild *fc, gint edge,
		      gint *my_bounds, gboolean recompute_our_size)
{
    GtkFormConstraint *ec = &fc->constraints [edge];
 
    if (ec->state != STATE_DONE)
    {
	if (ec->state == STATE_VISITED)
	    printf ("FormLayout.layout: Circular dependency!\n");
	else
	{
	    gint location = 0;
 
	    ec->state = STATE_VISITED;
 
	    /*
	     * At this point, we can do the work.
	     */
 
	    switch (ec->attachment)
	    {
		case GTK_FORM_ATTACH_SELF:
			if ( !recompute_our_size ) {
				location = (int)(my_bounds [edge] * ec->fraction);
				break ;
			}
			/* if computing size fall through to NONE */
 
		case GTK_FORM_ATTACH_NONE:
			location = ec->location;
			ec->offset = 0;
 
			/*
			 * Edges that don't have attachmenta are now
			 * treated as if they were attached relative to the
			 * opposite edge.  This lets us propagate the value
			 * for lower_container_relative.  Since it is possible
			 * that the opposite edge depends on this edge, we
			 * need to catch the circular dependency first.
			 */
 
			if ( fc->constraints[edge^2].state != STATE_VISITED ) {
				gtk_form_layout_edge(env, fc, edge^2, my_bounds,
									recompute_our_size);
				location = ec->location ;
			}
			ec->lower_container_relative = 
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_FORM:
		    location = my_bounds [edge];
			ec->lower_container_relative =
					edge == GTK_FORM_EDGE_BOTTOM ||
					edge == GTK_FORM_EDGE_RIGHT ;
		    break;
 
		case GTK_FORM_ATTACH_WIDGET:
		    location = ec->factor +	/* This IS correct */
			       gtk_form_layout_edge (env, ec->child,
						     edge ^ 2, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_OPPOSITE_WIDGET:
		    location = gtk_form_layout_edge (env, ec->child,
						     edge, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_CENTER:
		{
		    gint center;
		    gint size;
 
		    if (ec->child == NULL)	/* Center on form */
		    {
			center = (my_bounds [edge ^ 2] -
				  my_bounds [edge]) / 2;
			if (center < 0) center = -center;
		    }
		    else
		    {
		        gint edge1;
		        gint edge2;
		        gint half;
 
			gtk_form_layout_edge (env, ec->child,
					      edge ^ 2, my_bounds,
					      recompute_our_size);
 			gtk_form_layout_edge (env, ec->child,
					      edge, my_bounds,
					      recompute_our_size);
 
			/* It might be tempting to use the return of
			 * gtk_form_layout_edge rather than the next 2 lines
			 * of code.  Bad idea because the second call to
			 * gtk_form_layout_edge may move the first edge.
			 */
 
			edge1 = ec->child->constraints [edge^2].location;
			edge2 = ec->child->constraints [edge].location;
			half = (edge1 - edge2) / 2;
			center = ec->child->constraints [edge].location +
				 half;
		    }
 
		    /* We depend on the opposite edge so lets lay him out
		     * first.
			 */
 
		    gtk_form_layout_edge (env, fc, edge ^ 2, my_bounds,
					    recompute_our_size);
 
		    size = fc->constraints [edge ^ 2].location -
			       fc->constraints [edge].location + 1;
 
		    location = center - size / 2;
 
		    break;
		}
 
		default:
		    printf ("FormLayout: Unknown attachment type!\n");
	    }
 
	    location += ec->offset * ec->factor;
 
	    gtk_form_move_edge (env, fc, edge, location, my_bounds,
				recompute_our_size && ec->lower_container_relative);
 
	    ec->state = STATE_DONE;
	}
    }
 
    return fc->constraints [edge].location;
}
 
static void gtk_form_move_edge (jmp_buf env, GtkFormChild *fc, int edge, int where,
		    gint *my_bounds, gboolean recompute)
{
    int diff = where - fc->constraints [edge].location;
 
    int opposite_edge = edge ^ 2;
 
    if (gtk_form_edge_should_move_too (fc, opposite_edge))
	fc->constraints [opposite_edge].location += diff;
    else
    {
	/* Special Case:  If we are in "recompute" mode and we shrink
	 * because of this constraint, then we need to expand the form
	 * to accomodate us instead of shrinking the child.
	 */
 
	if (recompute)
	{
	    int delta = diff * fc->constraints [opposite_edge].factor;
 
	    if (delta < 0)
	    {
		if (edge == GTK_FORM_EDGE_TOP || edge == GTK_FORM_EDGE_BOTTOM)
		    my_bounds [GTK_FORM_EDGE_BOTTOM] += -delta;
		else
		    my_bounds [GTK_FORM_EDGE_RIGHT] += -delta;
 
		longjmp (env, 1);
	    }
	}
    }
 
    fc->constraints [edge].location += diff;
}
 
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc, gint edge)
{
    /* Should edge move if the opposite edge moves.  e.g. If the LEFT
     * edge moves 10 pixels, should the RIGHT edge move too?
	 *
     * Simply stated, an edge can move if there are no constraints for
     * that edge or the constraints for that edge are relative to itself
     * (specifies a width) or the edge has not been layed out yet.
	 */
 
    int attachment = fc->constraints [edge].attachment;
 
    return (attachment == GTK_FORM_ATTACH_NONE) ||
	   (fc->constraints [edge].state != STATE_DONE) ||
	   (attachment == GTK_FORM_ATTACH_WIDGET &&
	    fc->constraints [edge].child == fc);
}
 
static void gtk_form_realize(GtkWidget *widget) 
{
	/** cette fonction est au coeur du dispositif c'est ici que la fenêtre est créé
         * avec les bonnes dimensions
         * notamment  la couche de dessin est préparé avec le contexte cairo
         * et le format de dessin classique
         **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtkform_realize\n");
	#endif
 
	GtkForm *form = GTK_FORM (widget);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GtkAllocation allocation;
	GdkWindowAttr attrs;
	guint attrs_mask;
 
	gtk_widget_set_realized(widget, TRUE);
 
	gtk_widget_get_allocation(widget, &allocation);
 
	attrs.x           = allocation.x;
	attrs.y           = allocation.y;
	attrs.width       = allocation.width;
	attrs.height      = allocation.height;
	attrs.window_type = GDK_WINDOW_CHILD;
	attrs.wclass      = GDK_INPUT_OUTPUT;
	attrs.event_mask  = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;
 
	attrs_mask = GDK_WA_X | GDK_WA_Y;
 
	priv->window = gdk_window_new(gtk_widget_get_parent_window(widget),
			   &attrs, attrs_mask);
	gdk_window_set_user_data(priv->window, widget);
	gtk_widget_set_window(widget, priv->window);
 
	/**widget->style = gtk_style_attach(gtk_widget_get_style( widget ),
                                                         priv->window);
        //gtk_style_set_background(widget->style, priv->window, GTK_STATE_NORMAL);**/
	GtkStyleContext * context = gtk_style_context_new ();
 
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 500,500);
	cairo_t *cairo = cairo_create (surface);
	gtk_render_background (context,
                       cairo,
                       allocation.x,
                       allocation.y,
                       allocation.width,
                       allocation.height);  
}

clairement j'ai une fenêtre vide encore.
si tu pouvais me mettre sur la voie sans donner la solution ... car c'est mieux d'apprendre soi même que de copier bêtement
déjà je comprends mieux l'usage de structure privée ...

**gerald3d** · 28/03/2020, 14h34

Envoyé par turboiii

suite

dans le fichier de test j'ai remplacé les multiples gtk_widget_show(foo); par une commande unique et bien plus efficace gtk_widget_show_all(window);

Oui tu as raison. Les gtk_window_show (); successifs ne servent à rien. Pour ma part j'ai pas mal factorisé le code de main (); :

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   /* Create a form */
    form = gtk_form_new ();
 
    /* Put the form in the main window */
    gtk_container_add (GTK_CONTAINER (window), form);
    gtk_container_set_border_width (GTK_CONTAINER (form), fwidth);
 
    /* Creation of 4 identical buttons */
    gint i;
    gchar *label;
    GtkWidget *button;
    GtkWidget *oldbutton = NULL;
    for (i=0; i < 4; i++) {
      label = g_strdup_printf ("button %d", i+1);
      button = gtk_button_new_with_label (label);
      gtk_widget_set_name (button, label);
      g_free (label);
 
      /* When the button is clicked, we call the "callback" function */
      g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (callback), NULL);
 
      /* Insert button into the upper left quadrant of the form */
      gtk_container_add(GTK_CONTAINER(form), button);
      gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
 
      switch (i) {
      case 0:
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
	break;
      case 1:
      case 2:
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, oldbutton, 0);
	break;
      case 3:
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, oldbutton, 0);
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	break;
      }
      if ( self && i!= 3) {
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	gtk_form_constrain (GTK_FORM (form), button, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
      }
      oldbutton=button;
    }
 
    /* Create "Quit" button */
     quit = gtk_button_new_with_label ("Quit");
 
     /* When the button is clicked, we call the "delete_event" function
      * and the program exits */
     g_signal_connect (G_OBJECT (quit), "clicked", G_CALLBACK (delete_event), NULL);
 
     /* Insert the quit button into the
      * lower half of the form */
     gtk_container_add(GTK_CONTAINER(form), quit);
     gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_WIDGET, button, 0);
     gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
     gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
     gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_FORM, NULL, 0);
 
    gtk_widget_show_all (window);

Au passage je ne transmets plus le texte du bouton à la fonction callback. Je récupère directement son nom que j'ai au préalable initialisé.

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void callback( GtkWidget *widget,
               gpointer   data )
{
  g_print ("Hello again - %s was pressed\n", gtk_widget_get_name (widget));
}

Pour revenir à ton dernier code à la première compilation j'obtiens ceci :

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gtkform.c: Dans la fonction «*gtk_form_get_preferred_width*»:
gtkform.c:510:22: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  510 |  for (children = form->children; children; children = children->next)
      |                      ^~
gtkform.c:528:22: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  528 |  for (children = form->children; children; children = children->next)
      |                      ^~
gtkform.c: Dans la fonction «*gtk_form_get_preferred_height*»:
gtkform.c:564:22: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  564 |  for (children = form->children; children; children = children->next)
      |                      ^~
gtkform.c:582:22: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  582 |  for (children = form->children; children; children = children->next)
      |                      ^~
gtkform.c: Dans la fonction «*gtk_form_size_allocate*»:
gtkform.c:636:22: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  636 |  for (children = form->children; children; children = children->next)
      |                      ^~
gtkform.c: Dans la fonction «*gtk_form_remove*»:
gtkform.c:736:9: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  736 |     form->children = g_list_remove (form->children, child);
      |         ^~
gtkform.c:736:41: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  736 |     form->children = g_list_remove (form->children, child);
      |                                         ^~
gtkform.c: Dans la fonction «*gtk_form_layout*»:
gtkform.c:781:18: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  781 |  for (list = form->children; list; list = list->next)
      |                  ^~
gtkform.c:790:18: erreur: «*GtkForm*» {alias «*struct _GtkForm*»} n'a pas de membre nommé «*children*»
  790 |  for (list = form->children; list; list = list->next)

Cela vient sûrement du fait que tu n'utilises pas le header que je t'ai transmis plus haut. Pour ma part children est déclaré dans GtkFormPrivate et n'est plus déclaré dans GtkForm.

J'ai rectifié toutes les erreurs pour pouvoir compiler. Le code s'exécute avec pas mal de warnings en console mais tous les widgets sont présents. Leur interaction avec la souris par contre est inopérante.

Voici les warnings importants en console :

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Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.406: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.406: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed
 Warning ici widget est consistant
 Warning ici widget est NULL pourquoi ?
 
** (test:19699): CRITICAL **: 14:19:08.407: gtk_form_find_child: assertion 'GTK_IS_WIDGET (widget)' failed

On voit que gtk_form_find_child(); génère un warning sur le deuxième argument. Ce n'est pas forcément une erreur de transmettre NULL sur celui-ci. Il peut être intéressant d'ajouter une condition pour le tester avant de vérifier son type ici.

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static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
	/** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
	if (widget == NULL)
		g_print (" Warning ici widget est NULL pourquoi ?\n");
	else
		g_print (" Warning ici widget est consistant\n");
	g_return_val_if_fail (GTK_IS_FORM (form), NULL);
        if (!widget) return NULL;
	g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
        ...

Après ces quelques modifications il reste à comprendre pourquoi le signal "clicked" ne fonctionne que sur les boutons 1 et 2 chez moi. Chez toi peut-être qu'ils vont tous fonctionner puisque nous n'avons pas le même main ();...

**turboiii** · 28/03/2020, 16h26

suite j'ai fini par trouver qu'il manque à minima une fonction draw que j'ai rajouté

mais c'est pas encore ça mais ca avance

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#include "gtkform.h"
#include <setjmp.h>
#include <stdio.h>
 
const gint HEIGHT = 400;
const gint WIDTH = 200;
 
enum
{
  STATE_RESET,
  STATE_VISITED,
  STATE_DONE
};
 
enum
{
  CHILD_PROP_TOP_ATTACHMENT = 1,
  CHILD_PROP_TOP_WIDGET,
  CHILD_PROP_TOP_OFFSET,
  CHILD_PROP_LEFT_ATTACHMENT,
  CHILD_PROP_LEFT_WIDGET,
  CHILD_PROP_LEFT_OFFSET,
  CHILD_PROP_BOTTOM_ATTACHMENT,
  CHILD_PROP_BOTTOM_WIDGET,
  CHILD_PROP_BOTTOM_OFFSET,
  CHILD_PROP_RIGHT_ATTACHMENT,
  CHILD_PROP_RIGHT_WIDGET,
  CHILD_PROP_RIGHT_OFFSET,
};
 
 
static void gtk_form_class_init    (GtkFormClass  *klass);
static void gtk_form_init	    (GtkForm	    *form);
static void gtk_form_finalize	    (GObject	    *object);
static void gtk_form_size_request  (GtkWidget	    *widget,
				     GtkRequisition *requisition);
static void gtk_form_size_allocate (GtkWidget	    *widget,
				     GtkAllocation  *allocation);
static void gtk_form_add	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_remove	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_forall	    (GtkContainer   *container,
				     gboolean	     include_internals,
				     GtkCallback     callback,
				     gpointer	     callback_data);
static void gtk_form_set_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     const GValue   *value,
				     GParamSpec     *pspec);
static void gtk_form_get_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     GValue         *value,
				     GParamSpec     *pspec);
static GType gtk_form_child_type (GtkContainer   *container);
 
static gboolean gtk_form_draw (GtkWidget *draw_area, cairo_t *cairo);
 
static void gtk_form_layout	   (GtkForm	   *form,
				    gint	   *my_bounds,
				    gboolean	    recompute_our_size);
static void gtk_form_layout_child  (jmp_buf	    env,
				    GtkFormChild   *fc,
				    gint           *my_bounds,
				    gboolean	    recompute_our_size);
static gint gtk_form_layout_edge   (jmp_buf         env,
				    GtkFormChild   *fc,
				    gint            edge,
				    gint           *my_bounds,
				    gboolean        recompute_our_size);
static void gtk_form_move_edge     (jmp_buf         env,
                                    GtkFormChild   *fc,
				    int             edge,
				    int             where,
				    gint           *my_bounds,
				    gboolean        recompute);
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc,
						gint edge);
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height);
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width);
static void gtk_form_realize(GtkWidget *widget);
 
static GtkContainerClass *parent_class = NULL;
 
 
/* Define private type */
G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
/** signification des paramètres pour G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
 * GtkForm est le type
 * le même préfixe GtkForm que pour la classe GtkFormClass
 * gtk_form sert l'implementation de la fonction (gtk_form)_get_type 
 * GTK_TYPE_WIDGET est le Gtype du widget parent define a parent class pointer accessible from the whole .c file
 **/
 
static GType gtk_form_attachment_get_type(void)
{
  static GType etype = 0;
  if (etype == 0) {
    static const GEnumValue values[] = {
      { GTK_FORM_ATTACH_NONE, "GTK_FORM_ATTACH_NONE", "none" },
      { GTK_FORM_ATTACH_FORM, "GTK_FORM_ATTACH_FORM", "form" },
      { GTK_FORM_ATTACH_WIDGET, "GTK_FORM_ATTACH_WIDGET", "widget" },
      { GTK_FORM_ATTACH_OPPOSITE_WIDGET, "GTK_FORM_ATTACH_OPPOSITE_WIDGET", "opposite_widget" },
      { GTK_FORM_ATTACH_CENTER, "GTK_FORM_ATTACH_CENTER", "center" },
	  { GTK_FORM_ATTACH_SELF, "GTK_FORM_ATTACH_SELF", "self" },
      { 0, NULL, NULL }
    };
	etype = g_enum_register_static ("GtkFormAttachment", values);
  }
  return etype;
}
#define GTK_TYPE_FORM_ATTACHMENT (gtk_form_attachment_get_type())
 
static void gtk_form_class_init (GtkFormClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
	GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 
	parent_class = g_type_class_peek_parent (klass);
 
	object_class->finalize = gtk_form_finalize;
 
	widget_class->size_allocate = gtk_form_size_allocate;
 
	widget_class->get_preferred_width = gtk_form_get_preferred_width;
	widget_class->get_preferred_height = gtk_form_get_preferred_height; 
 
	widget_class->realize = gtk_form_realize;
	widget_class->draw = gtk_form_draw;
 
	container_class->add = gtk_form_add;
	container_class->remove = gtk_form_remove;
	container_class->forall = gtk_form_forall;
	container_class->child_type = gtk_form_child_type;
 
	container_class->set_child_property = gtk_form_set_child_property;
	container_class->get_child_property = gtk_form_get_child_property;
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_ATTACHMENT,
						g_param_spec_enum ("top_attachment",
							"Top attachment",
							"Type of attachment of top edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_WIDGET,
						g_param_spec_object ("top_widget",
							"Top widget",
							"Target widget for top edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_OFFSET,
						g_param_spec_uint ("top_offset",
							"Top offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_ATTACHMENT,
						g_param_spec_enum ("left_attachment",
							"Left attachment",
							"Type of attachment of left edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_WIDGET,
						g_param_spec_object ("left_widget",
							"Left widget",
							"Target widget for left edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_OFFSET,
						g_param_spec_uint ("left_offset",
							"Left offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_ATTACHMENT,
						g_param_spec_enum ("bottom_attachment",
							"Bottom attachment",
							"Type of attachment of bottom edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_WIDGET,
						g_param_spec_object ("bottom_widget",
							"Bottom widget",
							"Target widget for bottom edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_OFFSET,
						g_param_spec_uint ("bottom_offset",
							"Bottom offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_RIGHT_ATTACHMENT,
						g_param_spec_enum ("right_attachment",
							"Right attachment",
							"Type of attachment of right edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_RIGHT_WIDGET,
						g_param_spec_object ("right_widget",
							"Right widget",
							"Target widget for right edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_OFFSET,
						g_param_spec_uint ("right_offset",
							"Right offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
}
 
static GType gtk_form_child_type (GtkContainer   *container)
{
  return GTK_TYPE_WIDGET;
}
 
static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
	/** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
	if (widget == NULL)
		g_print (" WARNING ici widget est NULL pourquoi ? %d\n", __LINE__); 
	else
		g_print (" ici widget est consistant\n");
	g_return_val_if_fail (GTK_IS_FORM (form), NULL);
	g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GList *list = priv->children;
	GtkFormChild *form_child;
	while (list)
	{
		form_child = list->data;
		if (form_child->widget == widget)
			return form_child;
		list = g_list_next (list);
	}
	// pas de chance pas trouvé !!!
	return NULL;
}
 
static void gtk_form_set_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			const GValue *value,
			GParamSpec   *pspec)
{
	GtkForm *form = GTK_FORM(container);
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	GtkFormChild * form_child = gtk_form_find_child (form, child);
 
	if (!form_child)
	{
		g_print (" WARNING ici form_child est NULL pourquoi %d\n", __LINE__); 
		GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
		return;
	}
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_TOP].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_TOP_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_TOP].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_TOP_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_TOP].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_LEFT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_LEFT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_BOTTOM_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_RIGHT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].offset = g_value_get_uint(value);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_get_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			GValue       *value,
			GParamSpec   *pspec)
{
	GtkForm *form = GTK_FORM(container);
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	GtkFormChild *form_child = gtk_form_find_child (form, child);
 
	if (!form_child)
	{
		g_print (" WARNING ici form_child est NULL pourquoi %d\n", __LINE__); 
		GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
		return;
	}
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_TOP].attachment);
	break;
  case CHILD_PROP_TOP_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_TOP].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_TOP].child) : NULL);
    break;
  case CHILD_PROP_TOP_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_TOP].offset);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_LEFT].attachment);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_LEFT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_LEFT].child) : NULL);
    break;
  case CHILD_PROP_LEFT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_LEFT].offset);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].attachment);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_BOTTOM].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_BOTTOM].child) : NULL);
    break;
  case CHILD_PROP_BOTTOM_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].offset);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_RIGHT].attachment);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_RIGHT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_RIGHT].child) : NULL);
    break;
  case CHILD_PROP_RIGHT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_RIGHT].offset);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_init (GtkForm *form)
{
	#ifdef CB_TEST
		g_print ("gtk_form_init\n");
	#endif
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	/* Set default values */
	priv->children            = NULL;
	priv->window              = NULL;
 
	/* Create cache for faster access */
	form->priv = priv;
 
	gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
 
	//gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), FALSE);
	gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), TRUE);
}
 
GtkWidget* gtk_form_new ()
{
	//#ifdef CB_TEST
		//g_print ("instance gtk_form_new créé\n");
	//#endif
	return GTK_WIDGET (g_object_new (GTK_TYPE_FORM, NULL));
}
 
void gtk_form_constrain (GtkForm	     *form,
		    GtkWidget	     *child,
		    GtkFormEdge       edge,
		    GtkFormAttachment attachment,
		    GtkWidget        *widget,
		    gint              offset)
{
	/** je suppose ici que une fois gtk_container_add(GTK_CONTAINER(form), widget);
         * a rajouté un widget dans la liste, cette commande permet d'appliquer la contrainte
         * il faut donc le trouver et le traiter
         * transfo utilisation de la structure privée nécessaire **/
	GtkFormChild *form_child;
 
	g_return_if_fail (GTK_IS_FORM (form));
	g_return_if_fail (GTK_IS_WIDGET (child));
 
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	// c'est ici qu'on le cherche
	form_child = gtk_form_find_child (form, child);
	if (!form_child)
	return;
	// arrivé ici on l'a sous le coude et on applique les contraintes
	#ifdef CB_TEST
		g_print ("gtk_form_constrain en action widget trouvé \n"); 
	#endif
 
	form_child->constraints[edge].location = 0;
	form_child->constraints[edge].attachment = attachment;
	form_child->constraints[edge].offset = offset;
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child ici normal widget est NULL c'est la commande %d\n", __LINE__); 
	#endif
	form_child->constraints[edge].child = gtk_form_find_child (form, widget);
	// pourquoi un child (ex un button ) aurait-il automatiquement un parent ?
	//if (gtk_widget_get_visible (child->parent) /* && GTK_WIDGET_VISIBLE (child) */ )
	//{
		//if (gtk_widget_get_mapped (child->parent))
			//gtk_widget_map (child);
 
		//gtk_widget_queue_resize (child);
	//}
 
 
	// je teste l'application des contraintes sur le widget traité via la structure privé???
 
	//if ( gtk_widget_get_visible (form_child->widget))
		//if (gtk_widget_get_mapped (form_child->widget))
			//gtk_widget_map (form_child->widget);
	//gtk_widget_queue_resize (child);
	// peut-être commande trop globale ??
	if (gtk_widget_get_visible (GTK_WIDGET (form)))
			gtk_widget_queue_resize (GTK_WIDGET (form));
}
 
static void gtk_form_finalize (GObject *object)
{
	g_return_if_fail (GTK_IS_FORM (object));
	#ifdef CB_TEST
		g_print ("gtk_form_finalize\n");
	#endif
 
	//GtkForm * form = GTK_FORM (object);
	//GtkFormPrivate *priv = G_TYPE_INSTANCE_GET_PRIVATE(form, GTK_TYPE_FORM, GtkFormPrivate);
	//// a voir si je dois libérer des ressources au moins la Glist?
 
	//GList *children = priv->children;
 
	//GtkFormChild *child;
 
	//while (children)
    //{
		//child = children->data;
		//children = g_list_remove (children, child);
		//g_free (child);	
    //}
 
  /* Always chain up to the parent class; as with dispose(), finalize()
   * is guaranteed to exist on the parent's class virtual function table
   */
 
	G_OBJECT_CLASS (parent_class)->finalize (object);
}
 
static void gtk_form_size_request(GtkWidget *widget, GtkRequisition *requisition) 
{
	/** nous stockons la taille préférée de notre widget, cette fonction ne sert qu'a cela
         * mais requisition sera par la suite consulté **/
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (requisition != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_size_request\n");
	#endif	
	requisition->width  = WIDTH;
	requisition->height = HEIGHT;
}
 
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
	/** la fonction établit une largeur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_width\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_width = *natural_width = requisition.width;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].location =
		child->constraints [GTK_FORM_EDGE_LEFT].location +
		minimum_size.width - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.width = my_bounds [GTK_FORM_EDGE_RIGHT] + 1;
	requisition.width += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
	/** la fonction établit une hauteur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_height\n");
	#endif
	GtkRequisition requisition;
	GList *children;
	GtkForm *form = GTK_FORM (widget);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_height = *natural_height = requisition.height;
	for (children = form->children; children; children = children->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = children->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].location =
		child->constraints [GTK_FORM_EDGE_TOP].location +
		minimum_size.height - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.height = my_bounds [GTK_FORM_EDGE_BOTTOM] + 1;
	requisition.height += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (allocation != NULL);
	gint my_bounds [4];
	#ifdef CB_TEST
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__); 
	#endif
	gtk_widget_set_allocation(widget, allocation);
	GtkForm *form = GTK_FORM (widget);
 
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GList *children = priv->children;
 
	my_bounds [GTK_FORM_EDGE_TOP] = 0 ;
	my_bounds [GTK_FORM_EDGE_LEFT] = 0 ;
	my_bounds [GTK_FORM_EDGE_BOTTOM] = my_bounds [GTK_FORM_EDGE_TOP] +
					 allocation->height - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
	my_bounds [GTK_FORM_EDGE_RIGHT] = my_bounds [GTK_FORM_EDGE_LEFT] +
					allocation->width - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
 
	gtk_form_layout (form, my_bounds, 0);
 
	GtkAllocation allocation_form;
 
	gtk_widget_get_allocation(GTK_WIDGET (form),&allocation_form);
 
	for (children = form->children; children; children = children->next)
	{
		GtkFormChild *child = children->data;
		GtkAllocation allocation;
 
		allocation.x = child->constraints [GTK_FORM_EDGE_LEFT].location +
				allocation_form.x + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		allocation.y = child->constraints [GTK_FORM_EDGE_TOP].location +
				allocation_form.y + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		allocation.width = child->constraints [GTK_FORM_EDGE_RIGHT].location -
				 child->constraints [GTK_FORM_EDGE_LEFT].location + 1;
		allocation.height = child->constraints [GTK_FORM_EDGE_BOTTOM].location -
				  child->constraints [GTK_FORM_EDGE_TOP].location + 1;
 
		gtk_widget_size_allocate (child->widget, &allocation);
	}
}
 
static void gtk_form_add (GtkContainer *container, GtkWidget    *widget)
{
	/** pour moi c'est ici que la commande gtk_container_add(GTK_CONTAINER(form), widget);
         * va entrer en action par subtitution/complément de gtk_container_add
         * notamment rajouter l'enfant à la liste privée
         **/
 
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (widget != NULL);
	/** je comprend avec la commande si dessous que si le wiget a déjà un parent
         * cela va être difficile de le sortir de l'autre structure pour le coller va générer un conflit
         **/
	//g_return_if_fail (widget->parent == NULL);
	// nouvelle commande plus adpter au contexte en gtk3 ????
	// g_return_if_fail (gtk_widget_get_parent_window(widget)); est-ce utile à ce stade du dev ???
	#ifdef CB_TEST
		g_print ("gtk_form_add en action %d\n", __LINE__); 
	#endif
	gint i;
 
	GtkForm * form = GTK_FORM (container);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	//création et remplissage de la structure form_child
	GtkFormChild *form_child = g_new (GtkFormChild, 1);
 
	form_child->widget = widget;
 
	for (i = 0; i < 4; i ++)
	{
		form_child->constraints[i].location = 0;
		form_child->constraints[i].attachment = GTK_FORM_ATTACH_NONE;
		form_child->constraints[i].offset = 0;
		form_child->constraints[i].factor = i < 2 ? 1 : -1;
		form_child->constraints[i].state = STATE_RESET;
		form_child->constraints[i].child = NULL;
		form_child->constraints[i].lower_container_relative = FALSE;
		form_child->constraints[i].fraction = 1.0;
	}
	priv->children = g_list_prepend (priv->children, form_child);
	// tient c'est ici qu'on définit que l'enfant à un parent et c'est le container bon ok!!
	/** gtk_widget_set_parent (GtkWidget *widget,
                       GtkWidget *parent);
     * This function is useful only when implementing subclasses of GtkContainer.
     * Sets the container as the parent of widget , and takes care of some details
     * such as updating the state and style of the child to reflect its new location
     **/
	gtk_widget_set_parent (widget, GTK_WIDGET (form));
}
 
static void gtk_form_remove (GtkContainer *container, GtkWidget    *widget)
{
	/** je suppose ici qu'il faut retirer un widget du container initial
         * transfo utilisation de la structure privée nécessaire **/
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (GTK_FORM (widget));
 
	GtkFormChild *child;
	GList *children;
	GtkForm *form = GTK_FORM (container);
 
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	children = priv->children;
 
	while (children)
    {
		child = children->data;
		children = children->next;
 
		if (child->widget == widget)
		{
		  gtk_widget_unparent (widget);
 
		  form->children = g_list_remove (form->children, child);
		  g_free (child);
 
		  if (gtk_widget_get_visible (GTK_WIDGET (container)))
			gtk_widget_queue_resize (GTK_WIDGET (container));
		  break;
		}
    }
}
 
static void gtk_form_forall (GtkContainer *container,
		  gboolean	include_internals,
		  GtkCallback	callback,
		  gpointer	callback_data)
{
  GtkFormChild *child;
  GList *children;
 
  g_return_if_fail (GTK_IS_FORM (container));
  g_return_if_fail (callback != NULL);
 
  GtkForm *form = GTK_FORM (container);
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);
  children = priv->children;
 
  while (children)
    {
      child = children->data;
      children = children->next;
 
      (* callback) (child->widget, callback_data);
    }
}
 
static void gtk_form_layout (GtkForm *form, gint *my_bounds, gboolean recompute_our_size)
{
    int count;
    g_return_if_fail (GTK_FORM (form));
    for (count = 0; count < 10000; )
    {
        GList *list;
	gboolean it_worked = 1;
 
	/** Reset the state of all edges. **/
 
	for (list = form->children; list; list = list->next)
	{
	    int edge;
	    GtkFormChild *form_child = list->data;
 
	    for (edge = 0; edge < 4; edge ++)
	        form_child->constraints [edge].state = STATE_RESET;
	}
 
	for (list = form->children; list; list = list->next)
	{
	    GtkFormChild *form_child = list->data;
 
	    jmp_buf env;
 
	    if (setjmp (env) == 0)
		gtk_form_layout_child (env, form_child, my_bounds,
				       recompute_our_size);
	    else
	    {
		it_worked = 0;
		count ++;
		break;
	    }
	}
 
	if (it_worked)
	    break;
    }
}
 
static void gtk_form_layout_child (jmp_buf env, GtkFormChild *fc, gint *my_bounds,
		       gboolean recompute_our_size)
{
    gint edge;
 
    for (edge = 0; edge < 4; edge ++)
	gtk_form_layout_edge (env, fc, edge, my_bounds, recompute_our_size);
}
 
static gint gtk_form_layout_edge (jmp_buf env, GtkFormChild *fc, gint edge,
		      gint *my_bounds, gboolean recompute_our_size)
{
    GtkFormConstraint *ec = &fc->constraints [edge];
 
    if (ec->state != STATE_DONE)
    {
	if (ec->state == STATE_VISITED)
	    printf ("FormLayout.layout: Circular dependency!\n");
	else
	{
	    gint location = 0;
 
	    ec->state = STATE_VISITED;
 
	    /*
	     * At this point, we can do the work.
	     */
 
	    switch (ec->attachment)
	    {
		case GTK_FORM_ATTACH_SELF:
			if ( !recompute_our_size ) {
				location = (int)(my_bounds [edge] * ec->fraction);
				break ;
			}
			/* if computing size fall through to NONE */
 
		case GTK_FORM_ATTACH_NONE:
			location = ec->location;
			ec->offset = 0;
 
			/*
			 * Edges that don't have attachmenta are now
			 * treated as if they were attached relative to the
			 * opposite edge.  This lets us propagate the value
			 * for lower_container_relative.  Since it is possible
			 * that the opposite edge depends on this edge, we
			 * need to catch the circular dependency first.
			 */
 
			if ( fc->constraints[edge^2].state != STATE_VISITED ) {
				gtk_form_layout_edge(env, fc, edge^2, my_bounds,
									recompute_our_size);
				location = ec->location ;
			}
			ec->lower_container_relative = 
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_FORM:
		    location = my_bounds [edge];
			ec->lower_container_relative =
					edge == GTK_FORM_EDGE_BOTTOM ||
					edge == GTK_FORM_EDGE_RIGHT ;
		    break;
 
		case GTK_FORM_ATTACH_WIDGET:
		    location = ec->factor +	/* This IS correct */
			       gtk_form_layout_edge (env, ec->child,
						     edge ^ 2, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_OPPOSITE_WIDGET:
		    location = gtk_form_layout_edge (env, ec->child,
						     edge, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_CENTER:
		{
		    gint center;
		    gint size;
 
		    if (ec->child == NULL)	/* Center on form */
		    {
			center = (my_bounds [edge ^ 2] -
				  my_bounds [edge]) / 2;
			if (center < 0) center = -center;
		    }
		    else
		    {
		        gint edge1;
		        gint edge2;
		        gint half;
 
			gtk_form_layout_edge (env, ec->child,
					      edge ^ 2, my_bounds,
					      recompute_our_size);
 			gtk_form_layout_edge (env, ec->child,
					      edge, my_bounds,
					      recompute_our_size);
 
			/* It might be tempting to use the return of
			 * gtk_form_layout_edge rather than the next 2 lines
			 * of code.  Bad idea because the second call to
			 * gtk_form_layout_edge may move the first edge.
			 */
 
			edge1 = ec->child->constraints [edge^2].location;
			edge2 = ec->child->constraints [edge].location;
			half = (edge1 - edge2) / 2;
			center = ec->child->constraints [edge].location +
				 half;
		    }
 
		    /* We depend on the opposite edge so lets lay him out
		     * first.
			 */
 
		    gtk_form_layout_edge (env, fc, edge ^ 2, my_bounds,
					    recompute_our_size);
 
		    size = fc->constraints [edge ^ 2].location -
			       fc->constraints [edge].location + 1;
 
		    location = center - size / 2;
 
		    break;
		}
 
		default:
		    printf ("FormLayout: Unknown attachment type!\n");
	    }
 
	    location += ec->offset * ec->factor;
 
	    gtk_form_move_edge (env, fc, edge, location, my_bounds,
				recompute_our_size && ec->lower_container_relative);
 
	    ec->state = STATE_DONE;
	}
    }
 
    return fc->constraints [edge].location;
}
 
static void gtk_form_move_edge (jmp_buf env, GtkFormChild *fc, int edge, int where,
		    gint *my_bounds, gboolean recompute)
{
    int diff = where - fc->constraints [edge].location;
 
    int opposite_edge = edge ^ 2;
 
    if (gtk_form_edge_should_move_too (fc, opposite_edge))
	fc->constraints [opposite_edge].location += diff;
    else
    {
	/* Special Case:  If we are in "recompute" mode and we shrink
	 * because of this constraint, then we need to expand the form
	 * to accomodate us instead of shrinking the child.
	 */
 
	if (recompute)
	{
	    int delta = diff * fc->constraints [opposite_edge].factor;
 
	    if (delta < 0)
	    {
		if (edge == GTK_FORM_EDGE_TOP || edge == GTK_FORM_EDGE_BOTTOM)
		    my_bounds [GTK_FORM_EDGE_BOTTOM] += -delta;
		else
		    my_bounds [GTK_FORM_EDGE_RIGHT] += -delta;
 
		longjmp (env, 1);
	    }
	}
    }
 
    fc->constraints [edge].location += diff;
}
 
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc, gint edge)
{
    /* Should edge move if the opposite edge moves.  e.g. If the LEFT
     * edge moves 10 pixels, should the RIGHT edge move too?
	 *
     * Simply stated, an edge can move if there are no constraints for
     * that edge or the constraints for that edge are relative to itself
     * (specifies a width) or the edge has not been layed out yet.
	 */
 
    int attachment = fc->constraints [edge].attachment;
 
    return (attachment == GTK_FORM_ATTACH_NONE) ||
	   (fc->constraints [edge].state != STATE_DONE) ||
	   (attachment == GTK_FORM_ATTACH_WIDGET &&
	    fc->constraints [edge].child == fc);
}
 
static void gtk_form_realize(GtkWidget *widget) 
{
	/** cette fonction est au coeur du dispositif c'est ici que la fenêtre est créé
         * avec les bonnes dimensions
         * notamment  la couche de dessin est préparé avec le contexte cairo
         * et le format de dessin classique
         **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtkform_realize %d\n", __LINE__); 
	#endif
 
	GtkForm *form = GTK_FORM (widget);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GtkAllocation allocation;
	GdkWindowAttr attrs;
	guint attrs_mask;
 
	gtk_widget_set_realized(widget, TRUE);
 
	gtk_widget_get_allocation(widget, &allocation);
 
	attrs.x           = allocation.x;
	attrs.y           = allocation.y;
	attrs.width       = allocation.width;
	attrs.height      = allocation.height;
	attrs.window_type = GDK_WINDOW_CHILD;
	attrs.wclass      = GDK_INPUT_OUTPUT;
	attrs.event_mask  = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;
 
	attrs_mask = GDK_WA_X | GDK_WA_Y;
 
	priv->window = gdk_window_new(gtk_widget_get_parent_window(widget),
			   &attrs, attrs_mask);
	gdk_window_set_user_data(priv->window, widget);
	gtk_widget_set_window(widget, priv->window);
 
	/**widget->style = gtk_style_attach(gtk_widget_get_style( widget ),
                                                         priv->window);
        //gtk_style_set_background(widget->style, priv->window, GTK_STATE_NORMAL);**/
	GtkStyleContext * context = gtk_style_context_new ();
 
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 500,500);
	cairo_t *cairo = cairo_create (surface);
	gtk_render_background (context,
                       cairo,
                       allocation.x,
                       allocation.y,
                       allocation.width,
                       allocation.height);  
}
 
static gboolean gtk_form_draw (GtkWidget *drawing_area, cairo_t *cairo)
{
 
	g_return_val_if_fail (GTK_FORM (drawing_area),FALSE);
	#ifdef CB_TEST
		g_print ("gtk_form_draw\n");
	#endif
 
	gint width = gtk_widget_get_allocated_width (drawing_area);
	gint height = gtk_widget_get_allocated_height (drawing_area);
 
	//GtkSpinButtonDiscretPrivate *priv = GTK_SPINBUTTONDISCRET(widget)->priv;
	gint center_x = (width / 2) ;
	gint center_y = (height / 2);
 
	/** comment on s'y prend pour dessiner les différents widgets **/
	cairo_arc(cairo, center_x, center_y, 50, 0, 2 * 3.14);
	cairo_stroke(cairo);
	return TRUE;
 
 
	/** return TRUE because we've handled this event, so no
         * further processing is required. **/
	return TRUE;
}

**turboiii** · 29/03/2020, 01h06

Hello la suite devait arriver....

J'ai trouvé mon erreur grâce à ta remarque relative à l’usage de children dans la structure privée j'avais créé une belle coquille car mon code n'était pas cohérent . Maintenant tout est bien dans la structure privée

voici mes 3 codes
le header

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#ifndef __GTK_FORM_H__
#define __GTK_FORM_H__
 
 
#include <gtk/gtk.h>
//gtk_form.h
G_BEGIN_DECLS
 
#define CB_TEST
 
/* define la variable GTK_TYPE_FORM contient la fonction  de type Gtype de la class */
#define GTK_TYPE_FORM gtk_form_get_type ()
 
G_DECLARE_FINAL_TYPE(GtkForm, gtk_form,GTK , FORM , GtkContainer)
/** signification des paramètres
 * le préfixe GtkForm pour la classe GtkFormClass
 * gtk_form pour définir le type gtk_form_get_type()
 * le transtypage GTK_FORM
 * l'ancêtre GtkContainer
 **/
 
typedef struct _GtkFormChild	  GtkFormChild;
typedef struct _GtkFormConstraint GtkFormConstraint;
 
typedef enum
{
  GTK_FORM_ATTACH_NONE,
  GTK_FORM_ATTACH_FORM,
  GTK_FORM_ATTACH_WIDGET,
  GTK_FORM_ATTACH_OPPOSITE_WIDGET,
  GTK_FORM_ATTACH_CENTER,
  GTK_FORM_ATTACH_SELF
} GtkFormAttachment;
 
typedef enum
{
/* N O T E:  These numbers ARE NOT ARBITRARY!! */
  GTK_FORM_EDGE_TOP = 0,
  GTK_FORM_EDGE_LEFT = 1,
  GTK_FORM_EDGE_BOTTOM = 2,
  GTK_FORM_EDGE_RIGHT = 3
} GtkFormEdge;
 
 
/* Type definition */
typedef struct _GtkFormPrivate GtkFormPrivate;
/* Private data structure */
struct _GtkFormPrivate 
{
	GList *children;
	GdkWindow *window;
};
 
struct _GtkForm
{
  GtkContainer parent;
  /*< Private >*/
   GtkFormPrivate *priv;
};
 
struct _GtkFormClass
{
  GtkContainerClass parent_class;
};
 
struct _GtkFormConstraint
{
  gint location;
  gint attachment;
  gint offset;
  gint factor;
  gint state;
  gboolean lower_container_relative;
  GtkFormChild *child;
  gfloat fraction;
};
 
struct _GtkFormChild
{
  GtkWidget *widget;
  GtkFormConstraint constraints [4];
};
 
/* Public API */
GtkWidget* gtk_form_new	      	      ();
void	   gtk_form_constrain	      (GtkForm	        *form,
				       GtkWidget        *child,
				       GtkFormEdge	 edge,
				       GtkFormAttachment attachment,
				       GtkWidget        *widget,
				       gint	 	 offset);
 
G_END_DECLS
#endif /* __GTK_FORM_H__ */

le source

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#include "gtkform.h"
#include <setjmp.h>
#include <stdio.h>
 
const gint HEIGHT = 200;
const gint WIDTH = 300;
 
enum
{
  STATE_RESET,
  STATE_VISITED,
  STATE_DONE
};
 
enum
{
  CHILD_PROP_TOP_ATTACHMENT = 1,
  CHILD_PROP_TOP_WIDGET,
  CHILD_PROP_TOP_OFFSET,
  CHILD_PROP_LEFT_ATTACHMENT,
  CHILD_PROP_LEFT_WIDGET,
  CHILD_PROP_LEFT_OFFSET,
  CHILD_PROP_BOTTOM_ATTACHMENT,
  CHILD_PROP_BOTTOM_WIDGET,
  CHILD_PROP_BOTTOM_OFFSET,
  CHILD_PROP_RIGHT_ATTACHMENT,
  CHILD_PROP_RIGHT_WIDGET,
  CHILD_PROP_RIGHT_OFFSET,
};
 
static void gtk_form_class_init    (GtkFormClass  *klass);
static void gtk_form_init	    (GtkForm	    *form);
static void gtk_form_finalize	    (GObject	    *object);
static void gtk_form_size_request  (GtkWidget	    *widget,
				     GtkRequisition *requisition);
static void gtk_form_size_allocate (GtkWidget	    *widget,
				     GtkAllocation  *allocation);
static void gtk_form_add	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_remove	    (GtkContainer   *container,
				     GtkWidget	    *widget);
static void gtk_form_forall	    (GtkContainer   *container,
				     gboolean	     include_internals,
				     GtkCallback     callback,
				     gpointer	     callback_data);
static void gtk_form_set_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     const GValue   *value,
				     GParamSpec     *pspec);
static void gtk_form_get_child_property (GtkContainer   *container,
				     GtkWidget      *child,
				     guint           property_id,
				     GValue         *value,
				     GParamSpec     *pspec);
static GType gtk_form_child_type (GtkContainer   *container);
 
static void gtk_form_layout	   (GtkForm	   *form,
				    gint	   *my_bounds,
				    gboolean	    recompute_our_size);
static void gtk_form_layout_child  (jmp_buf	    env,
				    GtkFormChild   *fc,
				    gint           *my_bounds,
				    gboolean	    recompute_our_size);
static gint gtk_form_layout_edge   (jmp_buf         env,
				    GtkFormChild   *fc,
				    gint            edge,
				    gint           *my_bounds,
				    gboolean        recompute_our_size);
static void gtk_form_move_edge     (jmp_buf         env,
                                    GtkFormChild   *fc,
				    int             edge,
				    int             where,
				    gint           *my_bounds,
				    gboolean        recompute);
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc,
						gint edge);
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height);
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width);
static void gtk_form_realize(GtkWidget *widget);
 
static GtkContainerClass *parent_class = NULL;
 
 
/* Define private type */
G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
/** signification des paramètres pour G_DEFINE_TYPE_WITH_PRIVATE(GtkForm, gtk_form, GTK_TYPE_CONTAINER)
 * GtkForm est le type
 * le même préfixe GtkForm que pour la classe GtkFormClass
 * gtk_form sert l'implementation de la fonction (gtk_form)_get_type 
 * GTK_TYPE_WIDGET est le Gtype du widget parent define a parent class pointer accessible from the whole .c file
 **/
 
static GType gtk_form_attachment_get_type(void)
{
  static GType etype = 0;
  if (etype == 0) {
    static const GEnumValue values[] = {
      { GTK_FORM_ATTACH_NONE, "GTK_FORM_ATTACH_NONE", "none" },
      { GTK_FORM_ATTACH_FORM, "GTK_FORM_ATTACH_FORM", "form" },
      { GTK_FORM_ATTACH_WIDGET, "GTK_FORM_ATTACH_WIDGET", "widget" },
      { GTK_FORM_ATTACH_OPPOSITE_WIDGET, "GTK_FORM_ATTACH_OPPOSITE_WIDGET", "opposite_widget" },
      { GTK_FORM_ATTACH_CENTER, "GTK_FORM_ATTACH_CENTER", "center" },
	  { GTK_FORM_ATTACH_SELF, "GTK_FORM_ATTACH_SELF", "self" },
      { 0, NULL, NULL }
    };
	etype = g_enum_register_static ("GtkFormAttachment", values);
  }
  return etype;
}
#define GTK_TYPE_FORM_ATTACHMENT (gtk_form_attachment_get_type())
 
static void gtk_form_class_init (GtkFormClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
	GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 
	parent_class = g_type_class_peek_parent (klass);
 
	object_class->finalize = gtk_form_finalize;
 
	widget_class->size_allocate = gtk_form_size_allocate;
 
	widget_class->get_preferred_width = gtk_form_get_preferred_width;
	widget_class->get_preferred_height = gtk_form_get_preferred_height; 
 
	widget_class->realize = gtk_form_realize;
 
	container_class->add = gtk_form_add;
	container_class->remove = gtk_form_remove;
	container_class->forall = gtk_form_forall;
	container_class->child_type = gtk_form_child_type;
 
	container_class->set_child_property = gtk_form_set_child_property;
	container_class->get_child_property = gtk_form_get_child_property;
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_ATTACHMENT,
						g_param_spec_enum ("top_attachment",
							"Top attachment",
							"Type of attachment of top edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_WIDGET,
						g_param_spec_object ("top_widget",
							"Top widget",
							"Target widget for top edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_TOP_OFFSET,
						g_param_spec_uint ("top_offset",
							"Top offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_ATTACHMENT,
						g_param_spec_enum ("left_attachment",
							"Left attachment",
							"Type of attachment of left edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_WIDGET,
						g_param_spec_object ("left_widget",
							"Left widget",
							"Target widget for left edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_LEFT_OFFSET,
						g_param_spec_uint ("left_offset",
							"Left offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_ATTACHMENT,
						g_param_spec_enum ("bottom_attachment",
							"Bottom attachment",
							"Type of attachment of bottom edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_WIDGET,
						g_param_spec_object ("bottom_widget",
							"Bottom widget",
							"Target widget for bottom edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_BOTTOM_OFFSET,
						g_param_spec_uint ("bottom_offset",
							"Bottom offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
 
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_RIGHT_ATTACHMENT,
						g_param_spec_enum ("right_attachment",
							"Right attachment",
							"Type of attachment of right edge of child",
							GTK_TYPE_FORM_ATTACHMENT, GTK_FORM_ATTACH_NONE,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
						CHILD_PROP_RIGHT_WIDGET,
						g_param_spec_object ("right_widget",
							"Right widget",
							"Target widget for right edge of child",
							GTK_TYPE_WIDGET,
							G_PARAM_READWRITE));
	gtk_container_class_install_child_property (container_class,
  						CHILD_PROP_RIGHT_OFFSET,
						g_param_spec_uint ("right_offset",
							"Right offset",
							"Offset from the target or form side",
							0, G_MAXUINT, 0,
							G_PARAM_READWRITE));
}
 
static GType gtk_form_child_type (GtkContainer   *container)
{
  return GTK_TYPE_WIDGET;
}
 
static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
	/** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
	if (widget == NULL)
		g_print (" WARNING ici widget est NULL pourquoi ? %d\n", __LINE__); 
	else
		g_print (" ici widget est consistant\n");
	g_return_val_if_fail (GTK_IS_FORM (form), NULL);
	g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GList *list = priv->children;
	GtkFormChild *form_child;
	while (list)
	{
		form_child = list->data;
		if (form_child->widget == widget)
			return form_child;
		list = g_list_next (list);
	}
	// pas de chance pas trouvé !!!
	return NULL;
}
 
static void gtk_form_set_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			const GValue *value,
			GParamSpec   *pspec)
{
	GtkForm *form = GTK_FORM(container);
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	GtkFormChild * form_child = gtk_form_find_child (form, child);
 
	if (!form_child)
	{
		g_print (" WARNING ici form_child est NULL pourquoi %d\n", __LINE__); 
		GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
		return;
	}
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_TOP].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_TOP_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_TOP].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_TOP_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_TOP].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_LEFT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_LEFT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_LEFT].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_BOTTOM_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_BOTTOM].offset = g_value_get_uint(value);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].attachment = g_value_get_enum(value);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].child = gtk_form_find_child (form, GTK_WIDGET (g_value_get_object (value)));
	break;
  case CHILD_PROP_RIGHT_OFFSET:
    form_child->constraints [GTK_FORM_EDGE_RIGHT].offset = g_value_get_uint(value);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_get_child_property (GtkContainer      *container,
			GtkWidget    *child,
			guint         property_id,
			GValue       *value,
			GParamSpec   *pspec)
{
	GtkForm *form = GTK_FORM(container);
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	GtkFormChild *form_child = gtk_form_find_child (form, child);
 
	if (!form_child)
	{
		g_print (" WARNING ici form_child est NULL pourquoi %d\n", __LINE__); 
		GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
		return;
	}
 
  switch (property_id) {
  case CHILD_PROP_TOP_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_TOP].attachment);
	break;
  case CHILD_PROP_TOP_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_TOP].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_TOP].child) : NULL);
    break;
  case CHILD_PROP_TOP_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_TOP].offset);
	break;
  case CHILD_PROP_LEFT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_LEFT].attachment);
	break;
  case CHILD_PROP_LEFT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_LEFT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_LEFT].child) : NULL);
    break;
  case CHILD_PROP_LEFT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_LEFT].offset);
	break;
  case CHILD_PROP_BOTTOM_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].attachment);
	break;
  case CHILD_PROP_BOTTOM_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_BOTTOM].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_BOTTOM].child) : NULL);
    break;
  case CHILD_PROP_BOTTOM_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_BOTTOM].offset);
	break;
  case CHILD_PROP_RIGHT_ATTACHMENT:
    g_value_set_enum (value, form_child->constraints[GTK_FORM_EDGE_RIGHT].attachment);
	break;
  case CHILD_PROP_RIGHT_WIDGET:
    g_value_set_object (value,
		form_child->constraints[GTK_FORM_EDGE_RIGHT].child ?
		G_OBJECT(form_child->constraints[GTK_FORM_EDGE_RIGHT].child) : NULL);
    break;
  case CHILD_PROP_RIGHT_OFFSET:
    g_value_set_uint(value, form_child->constraints[GTK_FORM_EDGE_RIGHT].offset);
	break;
  default:
    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
    break;
  }
}
 
static void gtk_form_init (GtkForm *form)
{
	#ifdef CB_TEST
		g_print ("gtk_form_init\n");
	#endif
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	/* Set default values */
	priv->children            = NULL;
	priv->window              = NULL;
 
	/* Create cache for faster access */
	form->priv = priv;
 
	gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
 
	gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), TRUE);
}
 
GtkWidget* gtk_form_new ()
{
	return GTK_WIDGET (g_object_new (GTK_TYPE_FORM, NULL));
}
 
void gtk_form_constrain (GtkForm	     *form,
		    GtkWidget	     *child,
		    GtkFormEdge       edge,
		    GtkFormAttachment attachment,
		    GtkWidget        *widget,
		    gint              offset)
{
	/** je suppose ici que une fois gtk_container_add(GTK_CONTAINER(form), widget);
         * a rajouté un widget dans la liste, cette commande permet d'appliquer la contrainte
         * il faut donc le trouver et le traiter
         * transfo utilisation de la structure privée nécessaire **/
	GtkFormChild *form_child;
 
	g_return_if_fail (GTK_IS_FORM (form));
	g_return_if_fail (GTK_IS_WIDGET (child));
 
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
	#endif
	// c'est ici qu'on le cherche
	form_child = gtk_form_find_child (form, child);
	if (!form_child)
	return;
	// arrivé ici on l'a sous le coude et on applique les contraintes
	#ifdef CB_TEST
		g_print ("gtk_form_constrain en action widget trouvé \n"); 
	#endif
 
	form_child->constraints[edge].location = 0;
	form_child->constraints[edge].attachment = attachment;
	form_child->constraints[edge].offset = offset;
	#ifdef CB_TEST
		g_print ("trace avant appel gtk_form_find_child ici normal widget est NULL c'est la commande %d\n", __LINE__); 
	#endif
	form_child->constraints[edge].child = gtk_form_find_child (form, widget);
	// pourquoi un child (ex un button ) aurait-il automatiquement un parent ?
	//if (gtk_widget_get_visible (child->parent) /* && GTK_WIDGET_VISIBLE (child) */ )
	//{
		//if (gtk_widget_get_mapped (child->parent))
			//gtk_widget_map (child);
 
		//gtk_widget_queue_resize (child);
	//}
 
 
	// je teste l'application des contraintes sur le widget traité via la structure privé???
 
	//if ( gtk_widget_get_visible (form_child->widget))
		//if (gtk_widget_get_mapped (form_child->widget))
			//gtk_widget_map (form_child->widget);
	//gtk_widget_queue_resize (child);
	// peut-être commande trop globale ??
	if (gtk_widget_get_visible (GTK_WIDGET (form)))
			gtk_widget_queue_resize (GTK_WIDGET (form));
}
 
static void gtk_form_finalize (GObject *object)
{
	g_return_if_fail (GTK_IS_FORM (object));
	#ifdef CB_TEST
		g_print ("gtk_form_finalize\n");
	#endif
 
	//GtkForm * form = GTK_FORM (object);
	//GtkFormPrivate *priv = G_TYPE_INSTANCE_GET_PRIVATE(form, GTK_TYPE_FORM, GtkFormPrivate);
	//// a voir si je dois libérer des ressources au moins la Glist?
 
	//GList *children = priv->children;
 
	//GtkFormChild *child;
 
	//while (children)
    //{
		//child = children->data;
		//children = g_list_remove (children, child);
		//g_free (child);	
    //}
 
  /* Always chain up to the parent class; as with dispose(), finalize()
   * is guaranteed to exist on the parent's class virtual function table
   */
 
	G_OBJECT_CLASS (parent_class)->finalize (object);
}
 
static void gtk_form_size_request(GtkWidget *widget, GtkRequisition *requisition) 
{
	/** nous stockons la taille préférée de notre widget, cette fonction ne sert qu'a cela
         * mais requisition sera par la suite consulté **/
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (requisition != NULL);
	#ifdef CB_TEST
		g_print ("gtk_form_size_request\n");
	#endif	
	requisition->width  = WIDTH;
	requisition->height = HEIGHT;
}
 
static void gtk_form_get_preferred_width (GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
	/** la fonction établit une largeur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_width\n");
	#endif
	GtkRequisition requisition;
	GtkForm *form = GTK_FORM (widget);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	GList *list;
 
 
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_width = *natural_width = requisition.width;
	for (list = priv->children; list; list = list->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = list->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].location =
		child->constraints [GTK_FORM_EDGE_LEFT].location +
		minimum_size.width - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.width = my_bounds [GTK_FORM_EDGE_RIGHT] + 1;
	requisition.width += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (list = priv->children; list; list = list->next)
	{
		GtkFormChild *child = list->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_get_preferred_height (GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
	/** la fonction établit une hauteur   xxxxx   **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtk_form_get_preferred_height\n");
	#endif
	GtkRequisition requisition;
	GList *list;
	GtkForm *form = GTK_FORM (widget);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	gint my_bounds [4] = { 0, 0, 0, 0 };
 
	gtk_form_size_request (widget, &requisition);
	*minimal_height = *natural_height = requisition.height;
	for (list = priv->children; list; list = list->next)
	{
		GtkRequisition minimum_size;
        GtkRequisition natural_size; // non utilisé ?
		GtkFormChild *child = list->data;
 
		gtk_widget_get_preferred_size (child->widget, &minimum_size, &natural_size);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].location =
		child->constraints [GTK_FORM_EDGE_TOP].location +
		minimum_size.height - 1;
	}
 
	gtk_form_layout (form, my_bounds, 1);
 
	requisition.height = my_bounds [GTK_FORM_EDGE_BOTTOM] + 1;
	requisition.height += gtk_container_get_border_width(GTK_CONTAINER (form)) * 2;
 
	for (list = priv->children; list; list = list->next)
	{
		GtkFormChild *child = list->data;
 
		child->constraints [GTK_FORM_EDGE_LEFT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_LEFT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_RIGHT].fraction =
		(float)child->constraints [GTK_FORM_EDGE_RIGHT].location / 
		(float)(my_bounds [GTK_FORM_EDGE_RIGHT]);
 
		child->constraints [GTK_FORM_EDGE_TOP].fraction =
		(float)child->constraints [GTK_FORM_EDGE_TOP].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
 
		child->constraints [GTK_FORM_EDGE_BOTTOM].fraction =
		(float)child->constraints [GTK_FORM_EDGE_BOTTOM].location / 
		(float)(my_bounds [GTK_FORM_EDGE_BOTTOM]);
	}
}
 
static void gtk_form_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
	g_return_if_fail (GTK_FORM (widget));
	g_return_if_fail (allocation != NULL);
	gint my_bounds [4];
	#ifdef CB_TEST
		g_print(" gtk_form_size_allocate passe ici %d\n", __LINE__); 
	#endif
	gtk_widget_set_allocation(widget, allocation);
	GtkForm *form = GTK_FORM (widget);
 
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GList *list;
 
	my_bounds [GTK_FORM_EDGE_TOP] = 0 ;
	my_bounds [GTK_FORM_EDGE_LEFT] = 0 ;
	my_bounds [GTK_FORM_EDGE_BOTTOM] = my_bounds [GTK_FORM_EDGE_TOP] +
					 allocation->height - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
	my_bounds [GTK_FORM_EDGE_RIGHT] = my_bounds [GTK_FORM_EDGE_LEFT] +
					allocation->width - 1 - 2*gtk_container_get_border_width(GTK_CONTAINER (form));
 
	gtk_form_layout (form, my_bounds, 0);
 
	GtkAllocation allocation_form;
 
	gtk_widget_get_allocation(GTK_WIDGET (form),&allocation_form);
 
	for (list = priv->children; list; list = list->next)
	{
		GtkFormChild *child = list->data;
		GtkAllocation allocation;
 
		allocation.x = child->constraints [GTK_FORM_EDGE_LEFT].location +
				allocation_form.x + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		allocation.y = child->constraints [GTK_FORM_EDGE_TOP].location +
				allocation_form.y + gtk_container_get_border_width(GTK_CONTAINER (form));
 
		allocation.width = child->constraints [GTK_FORM_EDGE_RIGHT].location -
				 child->constraints [GTK_FORM_EDGE_LEFT].location + 1;
		allocation.height = child->constraints [GTK_FORM_EDGE_BOTTOM].location -
				  child->constraints [GTK_FORM_EDGE_TOP].location + 1;
 
		gtk_widget_size_allocate (child->widget, &allocation);
	}
}
 
static void gtk_form_add (GtkContainer *container, GtkWidget    *widget)
{
	/** pour moi c'est ici que la commande gtk_container_add(GTK_CONTAINER(form), widget);
         * va entrer en action par subtitution/complément de gtk_container_add
         * notamment rajouter l'enfant à la liste privée
         **/
 
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (widget != NULL);
	/** je comprend avec la commande si dessous que si le wiget a déjà un parent
         * cela va être difficile de le sortir de l'autre structure pour le coller va générer un conflit
         **/
	#ifdef CB_TEST
		g_print ("gtk_form_add en action %d\n", __LINE__); 
	#endif
	gint i;
 
	GtkForm * form = GTK_FORM (container);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	//création et remplissage de la structure form_child
	GtkFormChild *form_child = g_new (GtkFormChild, 1);
 
	form_child->widget = widget;
 
	for (i = 0; i < 4; i ++)
	{
		form_child->constraints[i].location = 0;
		form_child->constraints[i].attachment = GTK_FORM_ATTACH_NONE;
		form_child->constraints[i].offset = 0;
		form_child->constraints[i].factor = i < 2 ? 1 : -1;
		form_child->constraints[i].state = STATE_RESET;
		form_child->constraints[i].child = NULL;
		form_child->constraints[i].lower_container_relative = FALSE;
		form_child->constraints[i].fraction = 1.0;
	}
	priv->children = g_list_prepend (priv->children, form_child);
	// tient c'est ici qu'on définit que l'enfant à un parent et c'est le container bon ok!!
	/** gtk_widget_set_parent (GtkWidget *widget,
                       GtkWidget *parent);
     * This function is useful only when implementing subclasses of GtkContainer.
     * Sets the container as the parent of widget , and takes care of some details
     * such as updating the state and style of the child to reflect its new location
     **/
	gtk_widget_set_parent (widget, GTK_WIDGET (form));
}
 
static void gtk_form_remove (GtkContainer *container, GtkWidget    *widget)
{
	/** je suppose ici qu'il faut retirer un widget du container initial
         * transfo utilisation de la structure privée nécessaire **/
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (GTK_FORM (widget));
 
	GtkFormChild *child;
 
	GtkForm *form = GTK_FORM (container);
 
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	GList *list = priv->children;
 
	while (list)
    {
		child = list->data;
		list = list->next;
 
		if (child->widget == widget)
		{
		  gtk_widget_unparent (widget);
 
		  list = g_list_remove (list, child);
		  g_free (child);
 
		  if (gtk_widget_get_visible (GTK_WIDGET (container)))
			gtk_widget_queue_resize (GTK_WIDGET (container));
		  break;
		}
    }
}
 
static void gtk_form_forall (GtkContainer *container,
		  gboolean	include_internals,
		  GtkCallback	callback,
		  gpointer	callback_data)
{
	GtkFormChild *child;
 
	g_return_if_fail (GTK_IS_FORM (container));
	g_return_if_fail (callback != NULL);
 
	GtkForm *form = GTK_FORM (container);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
	GList *list = priv->children;
 
	while (list)
    {
      child = list->data;
      list = list->next;
 
      (* callback) (child->widget, callback_data);
    }
}
 
static void gtk_form_layout (GtkForm *form, gint *my_bounds, gboolean recompute_our_size)
{
    int count;
    g_return_if_fail (GTK_FORM (form));
    GtkFormPrivate *priv = gtk_form_get_instance_private (form);
    for (count = 0; count < 10000; )
    {
        GList *list;
		gboolean it_worked = 1;
 
		/** Reset the state of all edges. **/
 
		for (list = priv->children; list; list = list->next)
		{
			int edge;
			GtkFormChild *form_child = list->data;
 
			for (edge = 0; edge < 4; edge ++)
				form_child->constraints [edge].state = STATE_RESET;
		}
 
		for (list = priv->children; list; list = list->next)
		{
			GtkFormChild *form_child = list->data;
 
			jmp_buf env;
 
			if (setjmp (env) == 0)
			gtk_form_layout_child (env, form_child, my_bounds,
						   recompute_our_size);
			else
			{
			it_worked = 0;
			count ++;
			break;
			}
		}
 
		if (it_worked)
			break;
    }
}
 
static void gtk_form_layout_child (jmp_buf env, GtkFormChild *fc, gint *my_bounds,
		       gboolean recompute_our_size)
{
    gint edge;
 
    for (edge = 0; edge < 4; edge ++)
	gtk_form_layout_edge (env, fc, edge, my_bounds, recompute_our_size);
}
 
static gint gtk_form_layout_edge (jmp_buf env, GtkFormChild *fc, gint edge,
		      gint *my_bounds, gboolean recompute_our_size)
{
    GtkFormConstraint *ec = &fc->constraints [edge];
 
    if (ec->state != STATE_DONE)
    {
	if (ec->state == STATE_VISITED)
	    g_print ("FormLayout.layout: Circular dependency!\n");
	else
	{
	    gint location = 0;
 
	    ec->state = STATE_VISITED;
 
	    /*
	     * At this point, we can do the work.
	     */
 
	    switch (ec->attachment)
	    {
		case GTK_FORM_ATTACH_SELF:
			if ( !recompute_our_size ) {
				location = (int)(my_bounds [edge] * ec->fraction);
				break ;
			}
			/* if computing size fall through to NONE */
 
		case GTK_FORM_ATTACH_NONE:
			location = ec->location;
			ec->offset = 0;
 
			/*
			 * Edges that don't have attachmenta are now
			 * treated as if they were attached relative to the
			 * opposite edge.  This lets us propagate the value
			 * for lower_container_relative.  Since it is possible
			 * that the opposite edge depends on this edge, we
			 * need to catch the circular dependency first.
			 */
 
			if ( fc->constraints[edge^2].state != STATE_VISITED ) {
				gtk_form_layout_edge(env, fc, edge^2, my_bounds,
									recompute_our_size);
				location = ec->location ;
			}
			ec->lower_container_relative = 
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_FORM:
		    location = my_bounds [edge];
			ec->lower_container_relative =
					edge == GTK_FORM_EDGE_BOTTOM ||
					edge == GTK_FORM_EDGE_RIGHT ;
		    break;
 
		case GTK_FORM_ATTACH_WIDGET:
		    location = ec->factor +	/* This IS correct */
			       gtk_form_layout_edge (env, ec->child,
						     edge ^ 2, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge^2].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_OPPOSITE_WIDGET:
		    location = gtk_form_layout_edge (env, ec->child,
						     edge, my_bounds,
						     recompute_our_size);
			ec->lower_container_relative =
				fc->constraints[edge].lower_container_relative;
		    break;
 
		case GTK_FORM_ATTACH_CENTER:
		{
		    gint center;
		    gint size;
 
		    if (ec->child == NULL)	/* Center on form */
		    {
			center = (my_bounds [edge ^ 2] -
				  my_bounds [edge]) / 2;
			if (center < 0) center = -center;
		    }
		    else
		    {
		        gint edge1;
		        gint edge2;
		        gint half;
 
			gtk_form_layout_edge (env, ec->child,
					      edge ^ 2, my_bounds,
					      recompute_our_size);
 			gtk_form_layout_edge (env, ec->child,
					      edge, my_bounds,
					      recompute_our_size);
 
			/* It might be tempting to use the return of
			 * gtk_form_layout_edge rather than the next 2 lines
			 * of code.  Bad idea because the second call to
			 * gtk_form_layout_edge may move the first edge.
			 */
 
			edge1 = ec->child->constraints [edge^2].location;
			edge2 = ec->child->constraints [edge].location;
			half = (edge1 - edge2) / 2;
			center = ec->child->constraints [edge].location +
				 half;
		    }
 
		    /* We depend on the opposite edge so lets lay him out
		     * first.
			 */
 
		    gtk_form_layout_edge (env, fc, edge ^ 2, my_bounds,
					    recompute_our_size);
 
		    size = fc->constraints [edge ^ 2].location -
			       fc->constraints [edge].location + 1;
 
		    location = center - size / 2;
 
		    break;
		}
 
		default:
		    g_print ("FormLayout: Unknown attachment type!\n");
	    }
 
	    location += ec->offset * ec->factor;
 
	    gtk_form_move_edge (env, fc, edge, location, my_bounds,
				recompute_our_size && ec->lower_container_relative);
 
	    ec->state = STATE_DONE;
	}
    }
 
    return fc->constraints [edge].location;
}
 
static void gtk_form_move_edge (jmp_buf env, GtkFormChild *fc, int edge, int where,
		    gint *my_bounds, gboolean recompute)
{
    int diff = where - fc->constraints [edge].location;
 
    int opposite_edge = edge ^ 2;
 
    if (gtk_form_edge_should_move_too (fc, opposite_edge))
	fc->constraints [opposite_edge].location += diff;
    else
    {
	/* Special Case:  If we are in "recompute" mode and we shrink
	 * because of this constraint, then we need to expand the form
	 * to accomodate us instead of shrinking the child.
	 */
 
	if (recompute)
	{
	    int delta = diff * fc->constraints [opposite_edge].factor;
 
	    if (delta < 0)
	    {
		if (edge == GTK_FORM_EDGE_TOP || edge == GTK_FORM_EDGE_BOTTOM)
		    my_bounds [GTK_FORM_EDGE_BOTTOM] += -delta;
		else
		    my_bounds [GTK_FORM_EDGE_RIGHT] += -delta;
 
		longjmp (env, 1);
	    }
	}
    }
 
    fc->constraints [edge].location += diff;
}
 
static gboolean gtk_form_edge_should_move_too (GtkFormChild *fc, gint edge)
{
    /* Should edge move if the opposite edge moves.  e.g. If the LEFT
     * edge moves 10 pixels, should the RIGHT edge move too?
	 *
     * Simply stated, an edge can move if there are no constraints for
     * that edge or the constraints for that edge are relative to itself
     * (specifies a width) or the edge has not been layed out yet.
	 */
 
    int attachment = fc->constraints [edge].attachment;
 
    return (attachment == GTK_FORM_ATTACH_NONE) ||
	   (fc->constraints [edge].state != STATE_DONE) ||
	   (attachment == GTK_FORM_ATTACH_WIDGET &&
	    fc->constraints [edge].child == fc);
}
 
static void gtk_form_realize(GtkWidget *widget) 
{
	/** cette fonction est au coeur du dispositif c'est ici que la fenêtre est créé
         * avec les bonnes dimensions
         * notamment  la couche de dessin est préparé avec le contexte cairo
         * et le format de dessin classique
         **/
	g_return_if_fail (GTK_FORM (widget));
	#ifdef CB_TEST
		g_print ("gtkform_realize %d\n", __LINE__); 
	#endif
 
	GtkForm *form = GTK_FORM (widget);
	GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
	GtkAllocation allocation;
	GdkWindowAttr attrs;
	guint attrs_mask;
 
	gtk_widget_set_realized(widget, TRUE);
 
	gtk_widget_get_allocation(widget, &allocation);
 
	attrs.x           = allocation.x;
	attrs.y           = allocation.y;
	attrs.width       = allocation.width;
	attrs.height      = allocation.height;
	attrs.window_type = GDK_WINDOW_CHILD;
	attrs.wclass      = GDK_INPUT_OUTPUT;
	attrs.event_mask  = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;
 
	attrs_mask = GDK_WA_X | GDK_WA_Y;
 
	priv->window = gdk_window_new(gtk_widget_get_parent_window(widget),
			   &attrs, attrs_mask);
	gdk_window_set_user_data(priv->window, widget);
	gtk_widget_set_window(widget, priv->window);
 
	/**widget->style = gtk_style_attach(gtk_widget_get_style( widget ),
                                                         priv->window);
        //gtk_style_set_background(widget->style, priv->window, GTK_STATE_NORMAL);**/
	GtkStyleContext * context = gtk_style_context_new ();
 
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 500,500);
	cairo_t *cairo = cairo_create (surface);
	gtk_render_background (context,
                       cairo,
                       allocation.x,
                       allocation.y,
                       allocation.width,
                       allocation.height);  
}

et toujours mon code de test non optimisé par rapport au tien pour comparer

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#include <gtk/gtk.h>
#include "gtkform.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
/* Our callback.
 * The data passed to this function is printed to stdout */
void callback( GtkWidget *widget,
               gpointer   data )
{
    g_print ("Hello again - %s was pressed\n", (char *) data);
}
 
/* This callback quits the program */
gint delete_event( GtkWidget *widget,
                   GdkEvent  *event,
                   gpointer   data )
{
    gtk_main_quit ();
    return FALSE;
}
 
int main( int   argc,
          char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button1;
    GtkWidget *button2;
    GtkWidget *button3;
    GtkWidget *button4;
    GtkWidget *quit;
    GtkWidget *form;
	int c ;
	guint width = 0 ;
	guint fwidth = 0 ;
	gboolean self = FALSE ;
 
    gtk_init (&argc, &argv);
 
	while ( (c=getopt(argc, argv, "b:B:s")) != EOF ) {
		switch (c) {
		case 'b' :
			fwidth = atoi(optarg) ;
			break ;
		case 'B' :
			width = atoi(optarg) ;
			break ;
		case 's' :
			self = TRUE ;
			break ;
		default :
			fprintf(stderr, "usage: form [-b n] [-B n] [-s]\n") ;
			fprintf(stderr, "   -b n    border width of form\n") ;
			fprintf(stderr, "   -B n    border width of window\n") ;
			fprintf(stderr, "   -s      make self attachments\n") ;
			return 1 ;
		}
	}
 
    /* Create a new window */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 
    /* Set the window title */
    gtk_window_set_title (GTK_WINDOW (window), "Table");
 
    /* Set a handler for delete_event that immediately
     * exits GTK. */
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (delete_event), NULL);
 
    /* Sets the border width of the window. */
    gtk_container_set_border_width (GTK_CONTAINER (window), width);
 
    /* Create a form */
    form = gtk_form_new ();
 
    /* Put the form in the main window */
    gtk_container_add (GTK_CONTAINER (window), form);
    gtk_container_set_border_width (GTK_CONTAINER (form), fwidth);
 
    /* Create first button */
    button1 = gtk_button_new_with_label ("button 1");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 1" as its argument */
    g_signal_connect (G_OBJECT (button1), "clicked",
	              G_CALLBACK (callback), (gpointer) "button 1");
 
 
    /* Insert button 1 into the upper left quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button1);
    gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button1, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
    /* Create second button */
 
    button2 = gtk_button_new_with_label ("button 2");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button2), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 2");
 
    /* Insert button 2 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button2);
    gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button1, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button2, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
    /* Create third button */
 
    button3 = gtk_button_new_with_label ("button 3");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button3), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 3");
 
    /* Insert button 3 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button3);
    gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button2, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_SELF, NULL, 0);
	  gtk_form_constrain (GTK_FORM (form), button3, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
    /* Create fourth button */
 
    button4 = gtk_button_new_with_label ("button 4");
 
    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 2" as its argument */
    g_signal_connect (G_OBJECT (button4), "clicked",
                      G_CALLBACK (callback), (gpointer) "button 4");
 
    /* Insert button 4 into the upper right quadrant of the form */
	gtk_container_add(GTK_CONTAINER(form), button4);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_WIDGET, button3, 0);
    gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
	if ( self ) {
	  gtk_form_constrain (GTK_FORM (form), button4, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_SELF, NULL, 0);
	}
 
    /* Create "Quit" button */
    quit = gtk_button_new_with_label ("Quit");
 
    /* When the button is clicked, we call the "delete_event" function
     * and the program exits */
    g_signal_connect (G_OBJECT (quit), "clicked",
                      G_CALLBACK (delete_event), NULL);
 
    /* Insert the quit button into the
     * lower half of the form */
 
	gtk_container_add(GTK_CONTAINER(form), quit);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_TOP, GTK_FORM_ATTACH_WIDGET, button1, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_LEFT, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_RIGHT, GTK_FORM_ATTACH_FORM, NULL, 0);
    gtk_form_constrain (GTK_FORM (form), quit, GTK_FORM_EDGE_BOTTOM, GTK_FORM_ATTACH_FORM, NULL, 0);
 
	gtk_widget_show_all(window);
    gtk_main ();
 
    return 0;
}

nota dans le source j'ai changé la taille

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const gint HEIGHT = 200;
const gint WIDTH = 300;

et j'ai fait varier self à TRUE ou FALSE

En effet en testant de près le résulat, tu pourras te rendre compte que la taille des boutons 1 à 3 est compatible avec la zone de clic sauf pour le bouton 4. Ci dessous dans l'image j'ai capturé létat quand on clique sur le côté gauche du bouton 4 ca réagit si je vais dans la zone de droite nada
Nom : Sélection_144.png
Affichages : 183
Taille : 9,0 Ko

Nom : Sélection_144.png
Affichages : 183
Taille : 9,0 Ko

je soupconne un oubli dans gtk_form_constrain, je creuse

**gerald3d** · 29/03/2020, 11h43

Bonjour turboiii.

Au risque de me répéter

le pointeur priv est initialisé par la macro G_DEFINE_TYPE_WITH_PRIVATE(). Donc la ligne 402 est inutile voir peux poser des problèmes.

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static void gtk_form_init (GtkForm *form)
{
#ifdef CB_TEST
  g_print ("gtk_form_init\n");
#endif
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);
 
  /* Set default values */
  priv->children            = NULL;
  priv->window              = NULL;
 
  /* Create cache for faster access */
  form->priv = priv;
 
  gtk_widget_set_has_window(GTK_WIDGET(form), TRUE);
 
  gtk_widget_set_redraw_on_allocate (GTK_WIDGET (form), TRUE);
}

Toujours dans la même fonction quel intérêt d'indiquer que la fenêtre à un GdkWindow ? La documentation officielle indique bien que tous les widgets construits disposent toujours d'un GdkWindow :

Note that all realized widgets have a non-NULL “window” pointer (gtk_widget_get_window() never returns a NULL window when a widget is realized)...

Cette ligne est inutile.

La dernière ligne est du même acabit. Par défaut le widget est redessiné lorsque sa taille change. Tu peux aussi supprimer cette ligne.

Dans la fonction suivante tu te poses la question pourquoi widget peut être NULL :

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static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
  /** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
  if (widget == NULL)
    g_print (" WARNING ici widget est NULL pourquoi ? %d\n", __LINE__); 
  else
  ...

La réponse vient de l'appel dans gtk_form_constrain (); pour le paramètre widget ligne 448. Pour le bouton 1 tu transmets bien NULL. C'est donc une situation normale pour la fonction GtkFormChild *gtk_form_find_child ();.

Partant de ce constat il faut ajouté un test pour vérifier si widget est NULL. Si tel est le cas on quitte normalement la fonction. Dans le cas contraire alors on teste s'il est du bon type.

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static GtkFormChild *gtk_form_find_child (GtkForm *form, GtkWidget *widget)
{
  /** ici on va détecter la présence d'un widget enfant dans la liste du container form **/
 
  if (widget == NULL)
    g_print (" WARNING ici widget est NULL pourquoi ? %d\n", __LINE__); 
  else
    g_print (" ici widget est consistant\n");
  g_return_val_if_fail (GTK_IS_FORM (form), NULL);
  if (!widget) return NULL;
  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
  GtkFormPrivate *priv = gtk_form_get_instance_private (form);

Pour l'instant cela ne résout rien du problème mais l'idée est de nettoyé le plus possible le code source. Moins il y a de lignes mieux on se porte.

Le problème se situe de toute manière dans la taille allouée aux widgets enfants. Ils sont affichés en entier mais leur surface réels utilisables est restreinte par rapport à leur taille affichée. D'où le problème de réaction de la souris.

**turboiii** · 30/03/2020, 16h23

Merci de ta patience.

Tu as raison d'insister. Du coup je cherche et je progresse.
ET JE NETTOIE M

ON CODE
bon j'ai essayé de mettre la ligne 14 en rouge

comment fais tu?
J'ai rajouté cette ligne juste pour comprendre ce qui se passe...
avec cette ligne effectvement il n'y a plus de contrainte appliquée du coup plus de défaut non plus. C'est le début de l'enquête.

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void gtk_form_constrain (GtkForm         *form,
            GtkWidget         *child,
            GtkFormEdge       edge,
            GtkFormAttachment attachment,
            GtkWidget        *widget,
            gint              offset)
{
    /** je suppose ici que une fois gtk_container_add(GTK_CONTAINER(form), widget);
     * a rajouté un widget dans la liste, cette commande permet d'appliquer la contrainte
     * il faut donc le trouver et le traiter
     * transfo utilisation de la structure privée nécessaire ? non à priori**/

    /** rajouter la ligne ci-dessous c'est ne pas appliquer de contrainte si pas de widget**/
    g_return_if_fail (GTK_IS_WIDGET (widget));
    g_return_if_fail (GTK_IS_FORM (form));
    g_return_if_fail (GTK_IS_WIDGET (child));
    #ifdef CB_TEST
        g_print ("trace avant appel gtk_form_find_child %d\n", __LINE__); 
    #endif
    // c'est ici qu'on le cherche
    GtkFormChild *form_child = gtk_form_find_child (form, child);
    if (!form_child)
    return;
    // arrivé ici on l'a sous le coude et on applique les contraintes
    #ifdef CB_TEST
        g_print ("gtk_form_constrain en action widget trouvé \n"); 
    #endif

    form_child->constraints[edge].location = 0;
    form_child->constraints[edge].attachment = attachment;
    form_child->constraints[edge].offset = offset;
    #ifdef CB_TEST
        g_print ("trace avant appel gtk_form_find_child ici normal widget est NULL c'est la commande %d\n", __LINE__); 
    #endif
    form_child->constraints[edge].child = gtk_form_find_child (form, widget);
    // pourquoi un child (ex un button ) aurait-il automatiquement un parent ?
    //if (gtk_widget_get_visible (child->parent) /* && GTK_WIDGET_VISIBLE (child) */ )
    //{
        //if (gtk_widget_get_mapped (child->parent))
            //gtk_widget_map (child);

        //gtk_widget_queue_resize (child);
    //}
    if (gtk_widget_get_visible (GTK_WIDGET (child)))
        /** This function is only for use in widget implementations.
         * Causes a widget to be mapped if it isn’t already.**/
        gtk_widget_map (child);
    gtk_widget_queue_resize (GTK_WIDGET (child));
}

**gerald3d** · 30/03/2020, 17h05

Ca avance ca avance

.

Pour passer un texte dans une autre couleur tu le sélectionnes et tu cliques sur l'icône "A" avec la petite flèche vers le bas. Un panel de couleurs apparaît. Tu fais ton choix et le tour est joué

.

gtkform et contrainte

GTK+ avec C & C++

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