event mask

GDK_NOTHING	a special code to indicate a null event.
GDK_DELETE	the window manager has requested that the toplevel window be hidden or destroyed, usually when the user clicks on a special icon in the title bar.
GDK_DESTROY	the window has been destroyed.
GDK_EXPOSE	all or part of the window has become visible and needs to be redrawn.
GDK_MOTION_NOTIFY	the pointer (usually a mouse) has moved.
GDK_BUTTON_PRESS	a mouse button has been pressed.
GDK_2BUTTON_PRESS	a mouse button has been double-clicked (clicked twice within a short period of time). Note that each click also generates a GDK_BUTTON_PRESS event.
GDK_3BUTTON_PRESS	a mouse button has been clicked 3 times in a short period of time. Note that each click also generates a GDK_BUTTON_PRESS event.
GDK_BUTTON_RELEASE	a mouse button has been released.
GDK_KEY_PRESS	a key has been pressed.
GDK_KEY_RELEASE	a key has been released.
GDK_ENTER_NOTIFY	the pointer has entered the window.
GDK_LEAVE_NOTIFY	the pointer has left the window.
GDK_FOCUS_CHANGE	the keyboard focus has entered or left the window.
GDK_CONFIGURE	the size, position or stacking order of the window has changed. Note that GTK+ discards these events for GDK_WINDOW_CHILD windows.
GDK_MAP	the window has been mapped.
GDK_UNMAP	the window has been unmapped.
GDK_PROPERTY_NOTIFY	a property on the window has been changed or deleted.
GDK_SELECTION_CLEAR	the application has lost ownership of a selection.
GDK_SELECTION_REQUEST	another application has requested a selection.
GDK_SELECTION_NOTIFY	a selection has been received.
GDK_PROXIMITY_IN	an input device has moved into contact with a sensing surface (e.g. a touchscreen or graphics tablet).
GDK_PROXIMITY_OUT	an input device has moved out of contact with a sensing surface.
GDK_DRAG_ENTER	the mouse has entered the window while a drag is in progress.
GDK_DRAG_LEAVE	the mouse has left the window while a drag is in progress.
GDK_DRAG_MOTION	the mouse has moved in the window while a drag is in progress.
GDK_DRAG_STATUS	the status of the drag operation initiated by the window has changed.
GDK_DROP_START	a drop operation onto the window has started.
GDK_DROP_FINISHED	the drop operation initiated by the window has completed.
GDK_CLIENT_EVENT	a message has been received from another application.
GDK_VISIBILITY_NOTIFY	the window visibility status has changed.
GDK_NO_EXPOSE	indicates that the source region was completely available when parts of a drawable were copied. This is not very useful.
GDK_SCROLL	the scroll wheel was turned
GDK_WINDOW_STATE	the state of a window has changed. See GdkWindowState for the possible window states
GDK_SETTING	a setting has been modified.
GDK_OWNER_CHANGE	the owner of a selection has changed. This event type was added in 2.6
GDK_GRAB_BROKEN	a pointer or keyboard grab was broken. This event type was added in 2.8.