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An input only grab is a ClutterGrab on the stage that doesn't have an explicit actor associated with it. This is useful for cases where event should be captured as if focus was stolen to some mysterious place that doesn't have anything in the scene graph that represents it. Internally, it's implemented using a 0x0 sized actor attached directly to the stage, and a clutter action that consumes the events. An input-only grab takes a handler, user data and a destroy function for the user data. These are handed to the ClutterAction, which handles the actual event handling. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2628> |
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