[GObject] Création d'un widget GtkLed

**Gamall** · 30/05/2010, 17h55

Bonjour,

J'essaye de m'entrainer à GObject, en créant un widget GtkLed. Il existe en effet un tuto sur ce site, mais apparemment, le système d'objets n'est plus dans Gtk+ mais dans GObject.

Du coup, je j'adapte le code du tuto, avec ce qui est donné dans la doc de GObject.

Voici pour l'instant le code de mon widget:

Code :

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#ifndef __GTK_LED_H_
#define __GTK_LED_H_
 
#include <glib.h>
#include <glib-object.h>
#include <gtk/gtk.h>
 
G_BEGIN_DECLS
 
#define GTK_TYPE_LED		(gtk_led_get_type ())
#define GTK_LED(o)			(G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_LED, GtkLed))
#define GTK_IS_LED(o)		(G_TYPE_CHECK_INSTANCE_TYPE	((o), GTK_TYPE_LED))
#define GTK_LED_CLASS(k)	(G_TYPE_CHECK_CLASS_CAST ((k), G_TYPE_LED, GtkLedClass))
#define GTK_IS_LED_CLASS(k)	(G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_LED))
#define GTK_LED_GET_CLASS(o)    (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_LED, GtkLedClass))
 
typedef struct _GtkLed		GtkLed;
typedef struct _GtkLedClass GtkLedClass;
typedef struct _GtkLedPrivate GtkLedPrivate;
 
struct _GtkLed {
  GtkWidget parent_instance;
 
  gint width;
  gint height;
 
  /*< private >*/
  GtkLedPrivate * priv;
};
 
struct _GtkLedClass {
  GtkWidgetClass parent_class;
};
 
GType gtk_led_get_type (void);
 
GtkWidget * gtk_led_new (const gchar * on_image, 
			 const gchar * off_image, 
			 gboolean state);
 
void gtk_led_set_state (GtkLed * self, gboolean state);
 
gboolean gtk_led_get_state (GtkLed * self);
 
G_END_DECLS
 
#endif /* !__GTK_LED_H_ */

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#include "gtkled.h"
#include <glib.h>
#include <glib-object.h>
#include <gtk/gtk.h>
 
struct _GtkLedPrivate {
  gchar * on_image;
  gchar * off_image;
 
  GdkPixbuf * on_pixbuf;
  GdkPixbuf * off_pixbuf;
 
  gboolean state;
};
 
#define GTK_LED_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_LED, GtkLedPrivate))
 
enum {
  PROP_0,
 
  PROP_IMAGE_ON,
  PROP_IMAGE_OFF,
 
  PROP_STATE
};
 
G_DEFINE_TYPE (GtkLed, gtk_led, GTK_TYPE_WIDGET)
 
 
static void
gtk_led_load_image (GtkLed * self)
{
  g_warn_if_fail (self != NULL);
  g_warn_if_fail (GTK_IS_LED(self));
 
  self->priv->on_pixbuf  = gdk_pixbuf_new_from_file (self->priv->on_image, NULL);
  self->priv->off_pixbuf = gdk_pixbuf_new_from_file (self->priv->off_image, NULL);
 
  self->width  = gdk_pixbuf_get_width  (self->priv->on_pixbuf);
  self->height = gdk_pixbuf_get_height (self->priv->off_pixbuf);
}
 
static void
gtk_led_paint (GtkWidget * widget)
{
  GtkLed        * self = GTK_LED (widget);
  GdkPixbuf     * pixbuf;
  gint  center_x = 0;
  gint  center_y = 0;
 
  if (!self->priv->on_pixbuf && !self->priv->off_pixbuf)
    gtk_led_load_image (self);
 
  gdk_window_clear_area (widget->window,
                         0, 0,
                         widget->allocation.width,
                         widget->allocation.height);
 
  center_x = (widget->allocation.width /  2) - (self->width / 2);
  center_y = (widget->allocation.height / 2 ) - (self->height / 2);
 
  if (self->priv->state)
    pixbuf = self->priv->on_pixbuf;
  else
    pixbuf = self->priv->off_pixbuf;
 
  gdk_pixbuf_render_to_drawable (pixbuf,
                                 GDK_DRAWABLE (widget->window),
                                 NULL,
                                 0, 0, center_x, center_y,
                                 self->width, self->height,
                                 GDK_RGB_DITHER_NORMAL, 1, 1);
}
 
static void
gtk_led_set_property (GObject           *object,
                      guint             prop_id,
                      const GValue      *value,
                      GParamSpec        *pspec)
{
  GtkLed * self = GTK_LED (object);
 
  switch (prop_id) {
    case PROP_STATE:
      gtk_led_set_state (self, g_value_get_boolean(value));
      break;
 
    case PROP_IMAGE_ON:
      g_free (self->priv->on_image);
      self->priv->on_image = g_value_dup_string (value);
      break;
 
    case PROP_IMAGE_OFF:
      g_free (self->priv->off_image);
      self->priv->off_image = g_value_dup_string (value);
      break;
 
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  }
}
 
static void
gtk_led_get_property (GObject           *object,
                      guint             prop_id,
                      GValue            *value,
                      GParamSpec        *pspec)
{
  GtkLed * self = GTK_LED (object);
 
  switch (prop_id) {
    case PROP_STATE:
      g_value_set_boolean (value, self->priv->state);
      break;
 
    case PROP_IMAGE_ON:
      g_value_set_string (value, self->priv->on_image);
      break;
 
    case PROP_IMAGE_OFF:
      g_value_set_string (value, self->priv->off_image);
      break;
 
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  }
}
 
static void
gtk_led_init (GtkLed * self)
{
  self->priv = GTK_LED_GET_PRIVATE (self);
 
  self->priv->state       = FALSE;
  self->priv->on_image    = NULL;
  self->priv->off_image   = NULL;
  self->priv->on_pixbuf   = NULL;
  self->priv->off_pixbuf  = NULL;
 
  self->width   = 0;
  self->height  = 0;
}
 
static void
gtk_led_realize (GtkWidget * widget)
{
  GdkWindowAttr attributes;
 
  g_warn_if_fail (widget != NULL);
  g_warn_if_fail (GTK_IS_LED(widget));
 
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x           = widget->allocation.x;
  attributes.y           = widget->allocation.y;
  attributes.width       = widget->allocation.width;
  attributes.height      = widget->allocation.height;
  attributes.wclass      = GDK_INPUT_OUTPUT;
  attributes.event_mask  = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 
  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
                                   &attributes,
                                   GDK_WA_X | GDK_WA_Y);
 
  gdk_window_set_user_data (widget->window, widget);
 
  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
}
 
static void
gtk_led_size_request (GtkWidget         *widget,
                      GtkRequisition    *requisition)
{
  g_warn_if_fail (widget != NULL);
  g_warn_if_fail (requisition != NULL);
  g_warn_if_fail (GTK_IS_LED(widget));
 
  requisition->width  = GTK_LED (widget)->width;
  requisition->height = GTK_LED (widget)->height;
}
 
static void
gtk_led_size_allocate (GtkWidget        *widget,
                       GtkAllocation    *allocation)
{
  g_warn_if_fail (widget != NULL);
  g_warn_if_fail (allocation != NULL);
  g_warn_if_fail (GTK_IS_LED(widget));
 
  widget->allocation = *allocation;
 
  if (GTK_WIDGET_REALIZED(widget)) {
    gdk_window_move_resize (widget->window,
                            allocation->x, allocation->y,
                            allocation->width, allocation->height);
  }
}
 
static void
gtk_led_dispose (GObject * object)
{
  GtkLed * self = GTK_LED (object);
 
  if (self->priv->on_pixbuf) {
    gdk_pixbuf_unref (self->priv->on_pixbuf);
    self->priv->on_pixbuf = NULL;
  }
 
  if (self->priv->off_pixbuf) {
    gdk_pixbuf_unref (self->priv->off_pixbuf);
    self->priv->off_pixbuf = NULL;
  }
 
  G_OBJECT_CLASS (gtk_led_parent_class)->dispose (object);
}
 
static void
gtk_led_finalize (GObject * object)
{
  GtkLed * self = GTK_LED (object);
 
  g_free (self->priv->on_image);
  g_free (self->priv->off_image);
 
  G_OBJECT_CLASS (gtk_led_parent_class)->finalize (object);
}
 
static gboolean
gtk_led_expose (GtkWidget       *widget,
                GdkEventExpose  *event)
{
  g_warn_if_fail (widget != NULL);
  g_warn_if_fail (event != NULL);
  g_warn_if_fail (GTK_IS_LED(widget));
 
  gtk_led_paint (widget);
 
  return FALSE;
}
 
static void
gtk_led_class_init (GtkLedClass * klass)
{
  GtkWidgetClass        *widget_class = GTK_WIDGET_CLASS (klass);
  GObjectClass          *gobject_class = G_OBJECT_CLASS (klass);
  GParamSpec            *pspec;
 
  widget_class->realize         = gtk_led_realize;
  widget_class->size_request    = gtk_led_size_request;
  widget_class->size_allocate   = gtk_led_size_allocate;
  widget_class->expose_event    = gtk_led_expose;
 
  gobject_class->set_property = gtk_led_set_property;
  gobject_class->get_property = gtk_led_get_property;
  gobject_class->dispose      = gtk_led_dispose;
  gobject_class->finalize     = gtk_led_finalize;
 
  pspec = g_param_spec_boolean ("state",
                                "State",
                                "True when the led is switched_on",
                                FALSE,
                                G_PARAM_READWRITE);           
  g_object_class_install_property (gobject_class, PROP_STATE, pspec);
 
  pspec = g_param_spec_string ("on-image",
                               "On-Image",
                               "Path for the led on image file",
                               "",
                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_IMAGE_ON, pspec);
 
  pspec = g_param_spec_string ("off-image",
                               "Off-Image",
                               "Path for the led off image file",
                               "",
                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_IMAGE_OFF, pspec);
 
 
  g_type_class_add_private (klass, sizeof(GtkLedPrivate));
}
 
/****************************************************************/
/*                  GtkLed's public API                       */
/****************************************************************/
 
GtkWidget * 
gtk_led_new (const gchar    *on_image,
             const gchar    *off_image,
             gboolean       state)
{
  GtkLed * self;
 
  g_warn_if_fail (on_image != NULL);
  g_warn_if_fail (off_image != NULL);
 
  self = g_object_new (GTK_TYPE_LED,
                       "state", state,
                       "on-image", on_image,
                       "off-image", off_image,
                       NULL);
 
  return GTK_WIDGET (self);
}
 
gboolean
gtk_led_get_state (GtkLed * led)
{
  g_warn_if_fail (led != NULL);
  g_warn_if_fail (GTK_IS_LED(led));
 
  return led->priv->state;
}
 
void
gtk_led_set_state (GtkLed * led, gboolean state)
{
  g_warn_if_fail (led != NULL);
  g_warn_if_fail (GTK_IS_LED(led));
 
  led->priv->state = state;
 
  gtk_led_paint (GTK_WIDGET(led));
}

et une appli utilisant le widget:

Code :

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#include <gtk/gtk.h>
#include "gtkled.h"
 
static void
toggled_handler (GtkWidget * widget, gpointer data)
{
	gtk_led_set_state (
	        GTK_LED(data),
	        gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget)));
}
 
int main (int argc, char ** argv)
{
  GtkWidget * window;
  GtkWidget * box;
  GtkWidget * button;
  GtkWidget * led;
 
  gtk_init (&argc, &argv);
 
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size (GTK_WINDOW(window), 320, 200);
  g_signal_connect (G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);
 
  box = gtk_vbox_new (TRUE, 5);
  gtk_container_add (GTK_CONTAINER(window), box);
 
  led = gtk_led_new ("led_on.png", "led_off.png", FALSE);
  gtk_box_pack_start (GTK_BOX(box), led, TRUE, FALSE, 0);
 
  button = gtk_toggle_button_new_with_label ("Click me");
  gtk_box_pack_start (GTK_BOX(box), button, TRUE, FALSE, 0);
  g_signal_connect (G_OBJECT(button), "toggled", G_CALLBACK(toggled_handler), led);
 
  gtk_widget_show_all (window);
 
  gtk_main ();
 
  return 0;
}

Seulemment, lorsque j'instancie mon widget, j'ai ces warnings de Gdk:

(GtkLed:2305): Gdk-CRITICAL **: gdk_window_clear_area_internal: assertion `GDK_IS_WINDOW (window)' failed

(GtkLed:2305): Gdk-CRITICAL **: gdk_draw_pixbuf: assertion `GDK_IS_DRAWABLE (drawable)' failed

Je ne comprends pas d'où ils viennent

Alors, ben si quelqu'un pouvait m'éclairer là dessus, ça serait sympa

Merci

**gege2061** · 31/05/2010, 17h27

Bonjour,

C'est simplement parce que le code demande de dessiner un widget qui n'est pas encore affiché, suffit de faire la vérification pour supprimer les erreurs :

Code :

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static void
gtk_led_paint (GtkWidget * widget)
{
  GtkLed        * self = GTK_LED (widget);
  GdkPixbuf     * pixbuf;
  gint  center_x = 0;
  gint  center_y = 0;

  if (!self->priv->on_pixbuf && !self->priv->off_pixbuf)
    gtk_led_load_image (self);
 
  if (gtk_widget_get_realized (widget)) {
    gdk_window_clear_area (widget->window,
                           0, 0,
                           widget->allocation.width,
                           widget->allocation.height);
 
    center_x = (widget->allocation.width /  2) - (self->width / 2);
    center_y = (widget->allocation.height / 2 ) - (self->height / 2);
    
    if (self->priv->state)
      pixbuf = self->priv->on_pixbuf;
    else
      pixbuf = self->priv->off_pixbuf;
   
    gdk_pixbuf_render_to_drawable (pixbuf,
                                   GDK_DRAWABLE (widget->window),
                                   NULL,
                                   0, 0, center_x, center_y,
                                   self->width, self->height,
                                   GDK_RGB_DITHER_NORMAL, 1, 1);
  }
}

**Gamall** · 02/06/2010, 17h14

Ah, merci beaucoup

Par contre, il y a autre chose, c'est ma fonction gtk_led_set_state, je voulais la changer comme ceci

Code :

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void
gtk_led_set_state (GtkLed * led, gboolean state)
{
  g_warn_if_fail (led != NULL);
  g_warn_if_fail (GTK_IS_LED(led));
 
  led->priv->state = state;
 
  gtk_widget_queue_draw (GTK_WIDGET(led));
  /* au lieu de gtk_led_paint */
}

Seulemment, dans ce cas, pour une raison que je n'arrive pas à expliquer, les fonctions gtk_led_size_requistion et gtk_led_size_allocate sont appelées avant que gtk_led_load_image, du coup, requisition->height vaut 1 et ma led ne s'affiche que sur un pixel de hauteur

Alors si quelqu'un sait remédier à ce problème, ça serait sympa

Merci

[GObject] Création d'un widget GtkLed

GTK+ avec C & C++

Vue hybride

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