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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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DROP_TARGET_WIN_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DROP_TARGET_WIN_H_
#include <memory>
#include "base/macros.h"
#include "ui/aura/window_observer.h"
#include "ui/base/dragdrop/drop_target_win.h"
namespace aura {
namespace client {
class DragDropDelegate;
}
} // namespace aura
namespace ui {
class DropTargetEvent;
class OSExchangeData;
} // namespace ui
namespace views {
// DesktopDropTargetWin takes care of managing drag and drop for
// DesktopWindowTreeHostWin. It converts Windows OLE drop messages into
// aura::client::DragDropDelegate calls.
class DesktopDropTargetWin : public ui::DropTargetWin,
public aura::WindowObserver {
public:
explicit DesktopDropTargetWin(aura::Window* root_window);
~DesktopDropTargetWin() override;
private:
// ui::DropTargetWin implementation:
DWORD OnDragEnter(IDataObject* data_object,
DWORD key_state,
POINT position,
DWORD effect) override;
DWORD OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT position,
DWORD effect) override;
void OnDragLeave(IDataObject* data_object) override;
DWORD OnDrop(IDataObject* data_object,
DWORD key_state,
POINT position,
DWORD effect) override;
// aura::WindowObserver implementation:
void OnWindowDestroyed(aura::Window* window) override;
// Common functionality for the ui::DropTargetWin methods to translate from
// COM data types to Aura ones.
void Translate(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect,
std::unique_ptr<ui::OSExchangeData>* data,
std::unique_ptr<ui::DropTargetEvent>* event,
aura::client::DragDropDelegate** delegate);
void NotifyDragLeave();
// The root window associated with this drop target.
aura::Window* root_window_;
// The Aura window that is currently under the cursor. We need to manually
// keep track of this because Windows will only call our drag enter method
// once when the user enters the associated HWND. But inside that HWND there
// could be multiple aura windows, so we need to generate drag enter events
// for them.
aura::Window* target_window_;
DISALLOW_COPY_AND_ASSIGN(DesktopDropTargetWin);
};
} // namespace views
#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DROP_TARGET_WIN_H_
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