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 : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#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_ */

Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
#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 : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
#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