1 // Copyright (c) 2012 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.
5 #ifndef ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
6 #define ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_
8 #include "ash/ash_export.h"
9 #include "base/basictypes.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "ui/events/event.h"
21 // Provides functions for handling drag events inside and outside the root
22 // window where drag is started. This internally sets up a capture window for
23 // tracking drag events outside the root window where drag is initiated.
24 // ash/wm/coordinate_conversion.h is used internally and only X11 environment
25 // is supported for now.
26 class ASH_EXPORT DragDropTracker {
28 DragDropTracker(aura::Window* context_root,
29 aura::WindowDelegate* delegate);
32 aura::Window* capture_window() { return capture_window_.get(); }
34 // Tells our |capture_window_| to take capture. This is not done right at
35 // creation to give the caller a chance to perform any operations needed
36 // before the capture is transfered.
39 // Gets the target located at |event| in the coordinates of the active root
41 aura::Window* GetTarget(const ui::LocatedEvent& event);
43 // Converts the locations of |event| in the coordinates of the active root
44 // window to the ones in |target|'s coordinates.
45 // Caller takes ownership of the returned object.
46 ui::LocatedEvent* ConvertEvent(aura::Window* target,
47 const ui::LocatedEvent& event);
50 // A window for capturing drag events while dragging.
51 scoped_ptr<aura::Window> capture_window_;
53 DISALLOW_COPY_AND_ASSIGN(DragDropTracker);
56 } // namespace internal
59 #endif // ASH_DRAG_DROP_DRAG_DROP_TRACKER_H_