| The manual for GtkWidget signals usually mentions that an event mask should be enabled, for example for motion-notify-event: 'to receive this signal, the GdkWindow associated to the widget needs to enable the GDK_POINTER_MOTION_MASK mask'. The quoted part above is unclear. It does not say how GdkWindow should set the mask for a widget. Is it by the user calling:? I: GdkWindow * w = gtk_widget_get_parent_window ( somegtkwidget ); gdk_window_set_events ( w, event_mask); II: gtk_widget_set_events (somegtkwidget, eventmask); gtk_widget_add_events (somegtkwidget, eventmask); Are set/add events in II convenience functions that call gtk_widget_get_parent_window and gdk_window_set_events? I have only used gtk_widget_add_events so far and observed that calling it or not calling it made no difference for basic widgets such as checkbox for the masks: GDK_FOCUS_CHANGE_MASK GDK_ENTER_NOTIFY_MASK GDK_LEAVE_NOTIFY_MASK GDK_BUTTON_PRESS_MASK GDK_BUTTON_RELEASE_MASK GDK_KEY_PRESS_MASK GDK_KEY_RELEASE_MASK I am learning and experimenting and so far I have only seen one case when gtk_widget_add_events made a difference and that was for motion-notify-event signal in a dialog. Without it the signal was reported when the mouse was in the enclosing top window. Any other instances when the gtk_widget_add_events is an absolute must? Of course I can choose always to call the gtk_widget_add_events, but I would like to understand this a bit better. Advice and comments would be appreciated. |
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