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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_AURA_CLIENT_DRAG_DROP_CLIENT_H_
#define UI_AURA_CLIENT_DRAG_DROP_CLIENT_H_
#include <memory>
#include "ui/aura/aura_export.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom-forward.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class ImageSkia;
class Point;
class Vector2d;
}
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 {
public:
virtual ~DragDropClient() = default;
// 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 ui::mojom::DragOperation StartDragAndDrop(
std::unique_ptr<ui::OSExchangeData> data,
aura::Window* root_window,
aura::Window* source_window,
const gfx::Point& screen_location,
int allowed_operations,
ui::mojom::DragEventSource source) = 0;
#if BUILDFLAG(IS_LINUX)
// Updates the drag image. An empty |image| may be used to hide a previously
// set non-empty drag image, and a non-empty |image| shows the drag image
// again if it was previously hidden.
//
// This must be called during an active drag and drop session.
virtual void UpdateDragImage(const gfx::ImageSkia& image,
const gfx::Vector2d& offset) = 0;
#endif // BUILDFLAG(IS_LINUX)
// 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
#endif // UI_AURA_CLIENT_DRAG_DROP_CLIENT_H_
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