1 files changed, 51 insertions, 0 deletions
diff --git a/ui/wm/public/drag_drop_delegate.h b/ui/wm/public/drag_drop_delegate.h
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+++ b/ui/wm/public/drag_drop_delegate.h
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+// 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_