| // Copyright (c) 2012 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_WM_PUBLIC_DRAG_DROP_DELEGATE_H_ |
| #define UI_WM_PUBLIC_DRAG_DROP_DELEGATE_H_ |
| |
| #include "ui/aura/aura_export.h" |
| |
| namespace ui { |
| class DropTargetEvent; |
| } |
| |
| namespace aura { |
| class Window; |
| namespace client { |
| |
| // Delegate interface for drag and drop actions on aura::Window. |
| class AURA_EXPORT DragDropDelegate { |
| public: |
| // OnDragEntered is invoked when the mouse enters this window during a drag & |
| // drop session. This is immediately followed by an invocation of |
| // OnDragUpdated, and eventually one of OnDragExited or OnPerformDrop. |
| virtual void OnDragEntered(const ui::DropTargetEvent& event) = 0; |
| |
| // Invoked during a drag and drop session while the mouse is over the window. |
| // This should return a bitmask of the DragDropTypes::DragOperation supported |
| // based on the location of the event. Return 0 to indicate the drop should |
| // not be accepted. |
| virtual int OnDragUpdated(const ui::DropTargetEvent& event) = 0; |
| |
| // Invoked during a drag and drop session when the mouse exits the window, or |
| // when the drag session was canceled and the mouse was over the window. |
| virtual void OnDragExited() = 0; |
| |
| // Invoked during a drag and drop session when OnDragUpdated returns a valid |
| // operation and the user release the mouse. |
| virtual int OnPerformDrop(const ui::DropTargetEvent& event) = 0; |
| |
| protected: |
| virtual ~DragDropDelegate() {} |
| }; |
| |
| AURA_EXPORT void SetDragDropDelegate(Window* window, |
| DragDropDelegate* delegate); |
| AURA_EXPORT DragDropDelegate* GetDragDropDelegate(Window* window); |
| |
| } // namespace client |
| } // namespace aura |
| |
| #endif // UI_WM_PUBLIC_DRAG_DROP_DELEGATE_H_ |