Gtk.Widget::button-release-event

function callback(widget, event:Gdk.EventButton, ):Boolean;

The ::button-release-event signal will be emitted when a button (typically from a mouse) is released.

To receive this signal, the Gdk.Window associated to the widget needs to enable the #GDK_BUTTON_RELEASE_MASK mask.

This signal will be sent to the grab widget if there is one.

widget: instance of Gtk.Widget that is emitting the signal
event: the Gdk.EventButton which triggered this signal.
Returns: true to stop other handlers from being invoked for the event. false to propagate the event further.