Changer une image lorsque la souris passe dessus.

Bonjour,

Mon programme a un GtkButton qui contient une GtkImage. Lorsque la souris passe sur l'image, j'aimerais que l'image change. Si quelqu'un a une idée de comment faire ?

J'ai trouvé avec gtk_container_remove() et g_object_ref() pour réutiliser le widget. g_object_ref() doit être appelée avant gtk_container_remove() sinon le widget est détruit, à moins qu'il ne soit référencé autre part.

Bonjour.

Serait-il possible de voir le code de construction de ton bouton ?

Voilà:

Code:

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  l->button = gtk_button_new();
  GTK_WIDGET_UNSET_FLAGS (l->button, GTK_CAN_DEFAULT);
  GTK_WIDGET_UNSET_FLAGS (l->button, GTK_CAN_FOCUS);
  gtk_box_pack_start(GTK_BOX(l->hboxlabel),l->button,FALSE,FALSE,0);
  gtk_button_set_relief (GTK_BUTTON (l->button), GTK_RELIEF_NONE);
  gtk_widget_show(l->button);
  l->sig_handler_tab_close = g_signal_connect ((gpointer) l->button, "clicked",
                                     G_CALLBACK (on_button_editor_tab_close_clicked),
                                     NULL);
  l->sig_handler_tab_close_enter = g_signal_connect ((gpointer) l->button, "enter-notify-event",
                                     G_CALLBACK (on_button_editor_tab_close_enter),
                                     NULL);
  l->sig_handler_tab_close_leave = g_signal_connect ((gpointer) l->button, "leave-notify-event",
                                     G_CALLBACK (on_button_editor_tab_close_leave),
                                     NULL);
  l->sig_handler_tab_close_pressed = g_signal_connect ((gpointer) l->button, "button-press-event",
                                     G_CALLBACK (on_button_editor_tab_close_pressed),
                                     NULL);
  l->sig_handler_tab_close_released = g_signal_connect ((gpointer) l->button, "button-release-event",
                                     G_CALLBACK (on_button_editor_tab_close_released),
                                     NULL);
  l->sig_handler_tab_close_expose = g_signal_connect ((gpointer) l->button, "expose-event",
                                     G_CALLBACK (on_button_editor_tab_close_expose),
                                     NULL);
 
  l->image_normal = gtk_image_new_from_file("close.png");
  l->image_enter = gtk_image_new_from_file("close_hover.png");
  l->image_pressed = gtk_image_new_from_file("close_clicked.png");
  gtk_container_add(GTK_CONTAINER(l->button),l->image_normal);
  gtk_widget_show(l->image_normal);
  gtk_widget_show(l->image_enter);
  gtk_widget_show(l->image_pressed);

Et les fonctions de traitement des signaux:

Code:

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int pressed = 0;
int leaved_once = 0;
 
void
on_button_editor_tab_close_clicked     (GtkButton       *button,
                                        gpointer         user_data)
{
  LISTE_OPEN_FILES * l = liste_editor_open_files;
  while(l != NULL) {
    if(GTK_BUTTON(l->button) == button) break;
    l = l->suiv;
  }
  editor_close(l);
}
 
gboolean
on_button_editor_tab_close_enter     (GtkButton       *button,
                                        gpointer         user_data)
{
  LISTE_OPEN_FILES * l = liste_editor_open_files;
  while(l != NULL) {
    if(GTK_BUTTON(l->button) == button) break;
    l = l->suiv;
  }
  if(pressed == 0) {
    g_object_ref(l->image_normal);
    gtk_container_remove(GTK_CONTAINER(l->button),l->image_normal);
    gtk_container_add(GTK_CONTAINER(l->button),l->image_enter);
  } else {
    g_object_ref(l->image_normal);
    gtk_container_remove(GTK_CONTAINER(l->button),l->image_normal);
    gtk_container_add(GTK_CONTAINER(l->button),l->image_pressed);
  }
  return FALSE;
}
 
gboolean
on_button_editor_tab_close_leave     (GtkButton       *button,
                                        gpointer         user_data)
{
  LISTE_OPEN_FILES * l = liste_editor_open_files;
  while(l != NULL) {
    if(GTK_BUTTON(l->button) == button) break;
    l = l->suiv;
  }
  if(pressed == 0) {
    if(leaved_once == 1) leaved_once = 0;
    else {
      g_object_ref(l->image_enter);
      gtk_container_remove(GTK_CONTAINER(l->button),l->image_enter);
      gtk_container_add(GTK_CONTAINER(l->button),l->image_normal);
    }
  } else {
    g_object_ref(l->image_pressed);
    gtk_container_remove(GTK_CONTAINER(l->button),l->image_pressed);
    gtk_container_add(GTK_CONTAINER(l->button),l->image_normal);
    leaved_once = 1;
  }
  return FALSE;
}
 
gboolean
on_button_editor_tab_close_pressed     (GtkButton       *button,
                                        gpointer         user_data)
{
  LISTE_OPEN_FILES * l = liste_editor_open_files;
  while(l != NULL) {
    if(GTK_BUTTON(l->button) == button) break;
    l = l->suiv;
  }
  if(pressed == 0) {
    g_object_ref(l->image_enter);
    gtk_container_remove(GTK_CONTAINER(l->button),l->image_enter);
    gtk_container_add(GTK_CONTAINER(l->button),l->image_pressed);
  }
  pressed = 1;
  return FALSE;
}
 
gboolean
on_button_editor_tab_close_released     (GtkButton       *button,
                                        gpointer         user_data)
{
 
  pressed = 0;
 
  return FALSE;
}
 
gboolean
on_button_editor_tab_close_expose     (GtkButton       *button,
                                        gpointer         user_data)
{
  // Supprime le cadre bleu autour du bouton lorsque la souris est sur le bouton:
  gtk_widget_set_state((GtkWidget*)button,GTK_STATE_NORMAL);
  return FALSE;
}

Les fonctions gtk_button_set_image(); et gtk_button_get_image(); ne feraient-elles pas l'affaire ?

Si, ça fonctionne aussi, merci.