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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