[Hiki] create - Ruby/GTK2 Hello World (commented) (ruby-gnome2-doc-cvs) - Ruby-GNOME2

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= Events

In addition to the above signal mechanism, events from the X Window Server are also reflected in GTK.

Here is an exhaustive list of catchable events:

* event
* button_press_event
* button_release_event
* scroll_event
* motion_notify_event
* delete_event
* destroy_event
* expose_event
* key_press_event
* key_release_event
* enter_notify_event
* leave_notify_event
* configure_event
* focus_in_event
* focus_out_event
* map_event
* unmap_event
* property_notify_event
* selection_clear_event
* selection_request_event
* selection_notify_event
* proximity_in_event
* proximity_out_event
* visibility_notify_event
* client_event
* no_expose_event
* window_state_event

You can connect some code to a specific X11 event exactly in the same way as we saw previously with 
GTK signals.  Just provide one of the above mentioned "event name" instead of "signal name":

  GLib::Instantiatable#signal_connect("event name") do
      # Code to execute upon reception of "event name".
  end

The callback code can accept 2 parameters, as follows:

  GLib::Instantiatable#signal_connect("event name") do |w, e|
      # ...
  end

(in this case, w will refer the widget, and e the event).

Depending of the return value of the block code, GTK will decide if the event should be spread or not:

* if true, GTK will stop the event processing here;
* if false, GTK will continue to propagate the event [xxx explain more]

Also, GDK selections and drag-and-drop issue several events, but these are reflected by GTK signals:

* selection_received
* selection_get
* drag_begin_event
* drag_end_event
* drag_data_delete
* drag_motion
* drag_drop
* drag_data_get
* drag_data_received

Ruby-GNOME2

[ruby-gnome2-doc-cvs] [Hiki] create - Ruby/GTK2 Hello World (commented)