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// Copyright (c) 2006-2008 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 VIEWS_WIDGET_ROOT_VIEW_DROP_TARGET_H_
#define VIEWS_WIDGET_ROOT_VIEW_DROP_TARGET_H_
#include <atlbase.h>
#include <atlapp.h>
#include <atlmisc.h>
#include "app/os_exchange_data.h"
#include "base/base_drop_target.h"
namespace gfx {
class Point;
}
namespace views {
class RootView;
class View;
// RootViewDropTarget takes care of managing drag and drop for the RootView and
// converts Windows OLE drop messages into Views drop messages.
//
// RootViewDropTarget is responsible for determining the appropriate View to
// use during a drag and drop session, and forwarding events to it.
class RootViewDropTarget : public BaseDropTarget {
public:
explicit RootViewDropTarget(RootView* root_view);
virtual ~RootViewDropTarget();
// If a drag and drop is underway and view is the current drop target, the
// drop target is set to null.
// This is invoked when a View is removed from the RootView to make sure
// we don't target a view that was removed during dnd.
void ResetTargetViewIfEquals(View* view);
protected:
virtual DWORD OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
virtual void OnDragLeave(IDataObject* data_object);
virtual DWORD OnDrop(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
private:
// Calculates the target view for a drop given the specified location in
// the coordinate system of the rootview. This tries to avoid continually
// querying CanDrop by returning target_view_ if the mouse is still over
// target_view_.
View* CalculateTargetView(const gfx::Point& root_view_location,
const OSExchangeData& data);
// RootView we were created for.
RootView* root_view_;
// View we're targeting events at.
View* target_view_;
// The deepest view under the current drop coordinate.
View* deepest_view_;
DISALLOW_EVIL_CONSTRUCTORS(RootViewDropTarget);
};
} // namespace views
#endif // VIEWS_WIDGET_ROOT_VIEW_DROP_TARGET_H_
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