| // Copyright 2014 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 ATHENA_UTIL_DRAG_HANDLE_H_ |
| #define ATHENA_UTIL_DRAG_HANDLE_H_ |
| |
| #include "athena/athena_export.h" |
| |
| namespace views { |
| class View; |
| } |
| |
| namespace athena { |
| class DragHandleScrollDelegate { |
| public: |
| virtual ~DragHandleScrollDelegate() {} |
| |
| // Beginning of a scroll gesture. |
| virtual void HandleScrollBegin(float delta) = 0; |
| |
| // End of the current scroll gesture with velocity |velocity|. |
| virtual void HandleScrollEnd(float velocity) = 0; |
| |
| // Update of the scroll position for the currently active scroll gesture. |
| virtual void HandleScrollUpdate(float delta) = 0; |
| }; |
| |
| enum DragHandleScrollDirection { DRAG_HANDLE_VERTICAL, DRAG_HANDLE_HORIZONTAL }; |
| |
| // Creates a handle view which notifies the delegate of the scrolls performed on |
| // it. |
| ATHENA_EXPORT views::View* CreateDragHandleView( |
| DragHandleScrollDirection scroll_direction, |
| DragHandleScrollDelegate* delegate, |
| int preferred_width, |
| int preferred_height); |
| |
| } // namespace athena |
| |
| #endif // ATHENA_UTIL_DRAG_HANDLE_H_ |