abcf1d589f
Let gesture subclasses override how the drag threshold should be handled: • CLUTTER_GESTURE_TRIGGER_NONE tells GestureAction that the gesture must begin immediately and there's no drag limit that will cause its cancellation; • CLUTTER_GESTURE_TRIGGER_AFTER is the default GestureAction behaviour, where it needs to wait until the drag threshold has been exceeded before considering the gesture valid; • CLUTTER_GESTURE_TRIGGER_BEFORE will make GestureAction cancel the gesture once the drag exceed the configured threshold. For example, ZoomAction and RotateAction could set CLUTTER_GESTURE_TRIGGER_NONE since the use of two fingers makes the begin of the action more self-evident, while an hypothetical Tap gesture may use CLUTTER_GESTURE_TRIGGER_BEFORE to cancel the tap if the pointer moves too much. https://bugzilla.gnome.org/show_bug.cgi?id=685028
59 lines
2 KiB
C
59 lines
2 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) 2012 Collabora Ltd..
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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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#ifndef __CLUTTER_GESTURE_ACTION_PRIVATE_H__
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#define __CLUTTER_GESTURE_ACTION_PRIVATE_H__
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#include <clutter/clutter-gesture-action.h>
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G_BEGIN_DECLS
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/*< private >
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* ClutterGestureTriggerEdge:
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* @CLUTTER_GESTURE_TRIGGER_NONE: Tell #ClutterGestureAction that
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* the gesture must begin immediately and there's no drag limit that
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* will cause its cancellation;
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* @CLUTTER_GESTURE_TRIGGER_AFTER: Tell #ClutterGestureAction that
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* it needs to wait until the drag threshold has been exceeded before
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* considering that the gesture has begun;
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* @CLUTTER_GESTURE_TRIGGER_BEFORE: Tell #ClutterGestureAction that
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* the gesture must begin immegiately and that it must be cancelled
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* once the drag exceed the configured threshold.
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*
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* Enum passed to the _clutter_gesture_action_set_threshold_trigger_edge()
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* function.
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*
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* Since: 1.14
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*/
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typedef enum
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{
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CLUTTER_GESTURE_TRIGGER_EDGE_NONE = 0,
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CLUTTER_GESTURE_TRIGGER_EDGE_AFTER,
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CLUTTER_GESTURE_TRIGGER_EDGE_BEFORE
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} ClutterGestureTriggerEdge;
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void _clutter_gesture_action_set_threshold_trigger_edge (ClutterGestureAction *action,
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ClutterGestureTriggerEdge edge);
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G_END_DECLS
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#endif /* __CLUTTER_GESTURE_ACTION_PRIVATE_H__ */
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