Function

Gdkpointer_grab

Declaration [src]

GdkGrabStatus
gdk_pointer_grab (
  GdkWindow* window,
  gboolean owner_events,
  GdkEventMask event_mask,
  GdkWindow* confine_to,
  GdkCursor* cursor,
  guint32 time_
)

Description [src]

Grabs the pointer (usually a mouse) so that all events are passed to this application until the pointer is ungrabbed with gdk_pointer_ungrab(), or the grab window becomes unviewable. This overrides any previous pointer grab by this client.

Pointer grabs are used for operations which need complete control over mouse events, even if the mouse leaves the application. For example in GTK+ it is used for Drag and Drop, for dragging the handle in the GtkHPaned and GtkVPaned widgets.

Note that if the event mask of an X window has selected both button press and button release events, then a button press event will cause an automatic pointer grab until the button is released. X does this automatically since most applications expect to receive button press and release events in pairs. It is equivalent to a pointer grab on the window with owner_events set to TRUE.

If you set up anything at the time you take the grab that needs to be cleaned up when the grab ends, you should handle the GdkEventGrabBroken events that are emitted when the grab ends unvoluntarily.

Deprecated since:3.0

Use gdk_device_grab() instead.

Parameters

window GdkWindow
 

The GdkWindow which will own the grab (the grab window).

 The data is owned by the caller of the function.
owner_events gboolean
 

If FALSE then all pointer events are reported with respect to window and are only reported if selected by event_mask. If TRUE then pointer events for this application are reported as normal, but pointer events outside this application are reported with respect to window and only if selected by event_mask. In either mode, unreported events are discarded.

event_mask GdkEventMask
 

Specifies the event mask, which is used in accordance with owner_events. Note that only pointer events (i.e. button and motion events) may be selected.

confine_to GdkWindow
 

If non-NULL, the pointer will be confined to this window during the grab. If the pointer is outside confine_to, it will automatically be moved to the closest edge of confine_to and enter and leave events will be generated as necessary.

 The argument can be NULL.
 The data is owned by the caller of the function.
cursor GdkCursor
 

The cursor to display while the grab is active. If this is NULL then the normal cursors are used for window and its descendants, and the cursor for window is used for all other windows.

 The argument can be NULL.
 The data is owned by the caller of the function.
time_ guint32
 

The timestamp of the event which led to this pointer grab. This usually comes from a GdkEventButton struct, though GDK_CURRENT_TIME can be used if the time isn’t known.

Return value

Returns: GdkGrabStatus
 

GDK_GRAB_SUCCESS if the grab was successful.