| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_TOUCH_SELECTION_DRAG_DRAGGABLE_H_ |
| #define UI_TOUCH_SELECTION_DRAG_DRAGGABLE_H_ |
| |
| #include "ui/gfx/geometry/point_f.h" |
| #include "ui/touch_selection/ui_touch_selection_export.h" |
| |
| namespace ui { |
| |
| class MotionEvent; |
| class TouchSelectionDraggable; |
| |
| // Interface through which TouchSelectionDraggable manipulates the selection. |
| class UI_TOUCH_SELECTION_EXPORT TouchSelectionDraggableClient { |
| public: |
| virtual ~TouchSelectionDraggableClient() {} |
| virtual void OnDragBegin(const TouchSelectionDraggable& draggable, |
| const gfx::PointF& start_position) = 0; |
| virtual void OnDragUpdate(const TouchSelectionDraggable& draggable, |
| const gfx::PointF& new_position) = 0; |
| virtual void OnDragEnd(const TouchSelectionDraggable& draggable) = 0; |
| virtual bool IsWithinTapSlop(const gfx::Vector2dF& delta) const = 0; |
| }; |
| |
| // Generic interface for entities that manipulate the selection via dragging. |
| class UI_TOUCH_SELECTION_EXPORT TouchSelectionDraggable { |
| protected: |
| virtual ~TouchSelectionDraggable() {} |
| |
| // Offers a touch sequence to the draggable target. Returns true if the event |
| // was consumed, in which case the caller should cease further handling. |
| virtual bool WillHandleTouchEvent(const ui::MotionEvent& event) = 0; |
| |
| // Whether a drag is active OR being detected for the current touch sequence. |
| virtual bool IsActive() const = 0; |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_TOUCH_SELECTION_DRAG_DRAGGABLE_H_ |