[GObject] Création d'un widget GtkLed

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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Code:

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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)); }

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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; }

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

Citation:

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(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

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Je ne comprends pas d'où ils viennent :calim2:

Alors, ben si quelqu'un pouvait m'éclairer là dessus, ça serait sympa :ccool:
Merci :merci:

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); } }

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Ah, merci beaucoup :ccool:

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 */ }

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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 :aie:

Alors si quelqu'un sait remédier à ce problème, ça serait sympa :D
Merci ;)