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1 // Copyright 2014 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 ATHENA_UTIL_DRAG_HANDLE_H_ | |
6 #define ATHENA_UTIL_DRAG_HANDLE_H_ | |
7 | |
8 #include "athena/athena_export.h" | |
9 | |
10 namespace views { | |
11 class View; | |
12 } | |
13 | |
14 namespace athena { | |
15 class DragHandleScrollDelegate { | |
16 public: | |
17 virtual ~DragHandleScrollDelegate() {} | |
18 | |
19 // Beginning of a scroll gesture. | |
20 virtual void HandleScrollBegin(float delta) = 0; | |
21 | |
22 // End of the current scroll gesture with velocity |velocity|. | |
23 virtual void HandleScrollEnd(float velocity) = 0; | |
24 | |
25 // Update of the scroll position for the currently active scroll gesture. | |
26 virtual void HandleScrollUpdate(float delta) = 0; | |
27 }; | |
28 | |
29 enum DragHandleScrollDirection { DRAG_HANDLE_VERTICAL, DRAG_HANDLE_HORIZONTAL }; | |
30 | |
31 // Creates a handle view which notifies the delegate of the scrolls performed on | |
32 // it. | |
33 ATHENA_EXPORT views::View* CreateDragHandleView( | |
34 DragHandleScrollDirection scroll_direction, | |
35 DragHandleScrollDelegate* delegate, | |
36 int preferred_width, | |
37 int preferred_height); | |
38 | |
39 } // namespace athena | |
40 | |
41 #endif // ATHENA_UTIL_DRAG_HANDLE_H_ | |
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