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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef UI_VIEWS_DRAG_CONTROLLER_H_ | |
sky
2011/02/01 18:56:22
VIEWS_EVENTS
| |
6 #define UI_VIEWS_DRAG_CONTROLLER_H_ | |
7 #pragma once | |
8 | |
9 namespace ui { | |
10 | |
11 // DragController is responsible for writing drag data for a View, as well as | |
12 // supplying the supported drag operations without having to subclass View. | |
13 class DragController { | |
14 public: | |
15 // Writes the data for the drag. | |
16 virtual void WriteDragData(View* sender, | |
17 const gfx::Point& press_pt, | |
18 OSExchangeData* data) = 0; | |
19 | |
20 // Returns the supported drag operations (see DragDropTypes for possible | |
21 // values). A drag is only started if this returns a non-zero value. | |
22 virtual int GetDragOperations(View* sender, const gfx::Point& p) = 0; | |
23 | |
24 // Returns true if a drag operation can be started. | |
25 // |press_pt| represents the coordinates where the mouse was initially | |
26 // pressed down. |p| is the current mouse coordinates. | |
27 virtual bool CanStartDrag(View* sender, | |
28 const gfx::Point& press_pt, | |
29 const gfx::Point& p) = 0; | |
30 | |
31 protected: | |
32 virtual ~DragController() {} | |
33 }; | |
34 | |
35 } // namespace ui | |
36 | |
37 #endif // UI_VIEWS_DRAG_CONTROLLER_H_ | |
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