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e917b7de43
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>
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2022 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "clutter-build-config.h"
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#include "clutter/clutter-input-only-action.h"
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#include "clutter/clutter-action-private.h"
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#include "clutter/clutter.h"
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struct _ClutterInputOnlyAction
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{
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ClutterAction parent;
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ClutterInputOnlyHandleEvent handle_event;
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gpointer user_data;
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GDestroyNotify user_data_destroy;
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};
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G_DEFINE_TYPE (ClutterInputOnlyAction, clutter_input_only_action,
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CLUTTER_TYPE_ACTION)
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static void
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clutter_input_only_action_dispose (GObject *object)
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{
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ClutterInputOnlyAction *input_only_action =
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CLUTTER_INPUT_ONLY_ACTION (object);
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if (input_only_action->user_data_destroy)
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{
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g_clear_pointer (&input_only_action->user_data,
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input_only_action->user_data_destroy);
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}
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G_OBJECT_CLASS (clutter_input_only_action_parent_class)->dispose (object);
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}
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static gboolean
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clutter_input_only_action_handle_event (ClutterAction *action,
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const ClutterEvent *event)
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{
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ClutterInputOnlyAction *input_only_action =
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CLUTTER_INPUT_ONLY_ACTION (action);
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return input_only_action->handle_event (event, input_only_action->user_data);
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}
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static void
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clutter_input_only_action_class_init (ClutterInputOnlyActionClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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ClutterActionClass *action_class = CLUTTER_ACTION_CLASS (klass);
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object_class->finalize = clutter_input_only_action_dispose;
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action_class->handle_event = clutter_input_only_action_handle_event;
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}
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static void
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clutter_input_only_action_init (ClutterInputOnlyAction *input_only_action)
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{
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}
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ClutterInputOnlyAction *
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clutter_input_only_action_new (ClutterInputOnlyHandleEvent handle_event,
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gpointer user_data,
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GDestroyNotify user_data_destroy)
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{
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ClutterInputOnlyAction *input_only_action;
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input_only_action = g_object_new (CLUTTER_TYPE_INPUT_ONLY_ACTION, NULL);
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input_only_action->handle_event = handle_event;
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input_only_action->user_data = user_data;
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input_only_action->user_data_destroy = user_data_destroy;
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clutter_action_set_phase (CLUTTER_ACTION (input_only_action),
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CLUTTER_PHASE_CAPTURE);
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return input_only_action;
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}
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