RE: Question about GtkButton->event_window.

[Owen Taylor <otaylor redhat com>]

On Thu, 2004-02-19 at 15:23, Tom Liu wrote:
> Check this Gtk+ source code:(gtkbutton.cpp) 
>
> static void gtk_button_realize (GtkWidget *widget)
> {
> [snip]
>   attributes.event_mask = gtk_widget_get_events (widget);
>   attributes.event_mask |= (GDK_EXPOSURE_MASK |
>                           GDK_BUTTON_PRESS_MASK |
>                           GDK_BUTTON_RELEASE_MASK |
>                           GDK_ENTER_NOTIFY_MASK |
>                           GDK_LEAVE_NOTIFY_MASK);
> [snip]
>   button->event_window = gdk_window_new (gtk_widget_get_parent_window
> (widget),
>                                        &attributes, attributes_mask);
>   gdk_window_set_user_data (button->event_window, button);
> [snip]
> }
>
> We can see GtkButton->event_window has GDK_EXPOSURE_MASK, means it will
> fire the expose event? But I tried to hook the widget->expose_event, and
> the GtkButton->event_window didn't send the "expose-event".

This is just a leftover from older versions of GtkButton that worked
differently ... these days GtkButton draws on its parent widget's
window and uses an input-only window to catch mouse events.

So, you might want to file a bug in bugzilla to clean up the code.

Regards,
                                        Owen