blob: 3d082567ca78106b33a529d18614e205933ce579 [file] [log] [blame]
// 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.
#include <memory>
#include "ui/aura/aura_export.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class Point;
namespace ui {
class OSExchangeData;
namespace aura {
class Window;
namespace client {
class DragDropClientObserver;
// An interface implemented by an object that controls a drag and drop session.
class AURA_EXPORT DragDropClient {
virtual ~DragDropClient() {}
// Initiates a drag and drop session. Returns the drag operation that was
// applied at the end of the drag drop session. |screen_location| is in
// screen coordinates. At most one drag and drop operation is allowed.
// It must not start drag operation while |IsDragDropInProgress| returns true.
virtual int StartDragAndDrop(std::unique_ptr<ui::OSExchangeData> data,
aura::Window* root_window,
aura::Window* source_window,
const gfx::Point& screen_location,
int operation,
ui::DragDropTypes::DragEventSource source) = 0;
// Called when a drag and drop session is cancelled.
virtual void DragCancel() = 0;
// Returns true if a drag and drop session is in progress.
virtual bool IsDragDropInProgress() = 0;
virtual void AddObserver(DragDropClientObserver* observer) = 0;
virtual void RemoveObserver(DragDropClientObserver* observer) = 0;
AURA_EXPORT void SetDragDropClient(Window* root_window,
DragDropClient* client);
AURA_EXPORT DragDropClient* GetDragDropClient(Window* root_window);
} // namespace client
} // namespace aura