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// Copyright 2017 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 <cstdint>
#include "base/macros.h"
#include "components/exo/data_offer_observer.h"
#include "components/exo/seat_observer.h"
#include "components/exo/surface.h"
#include "components/exo/surface_observer.h"
#include "ui/base/clipboard/clipboard_observer.h"
#include "ui/base/dragdrop/drag_drop_types.h"
namespace ui {
class DropTargetEvent;
namespace exo {
class DataDeviceDelegate;
class DataOffer;
class ScopedDataOffer;
class DataSource;
class FileHelper;
class Seat;
class ScopedSurface;
enum class DndAction { kNone, kCopy, kMove, kAsk };
// DataDevice to start drag and drop and copy and paste oprations.
class DataDevice : public WMHelper::DragDropObserver,
public DataOfferObserver,
public ui::ClipboardObserver,
public SurfaceObserver,
public SeatObserver {
explicit DataDevice(DataDeviceDelegate* delegate,
Seat* seat,
FileHelper* file_helper);
~DataDevice() override;
// Starts drag-and-drop operation.
// |source| represents data comes from the client starting drag operation. Can
// be null if the data will be transferred only in the client. |origin| is
// the surface which starts the drag and drop operation. |icon| is the
// nullable image which is rendered at the next to cursor while drag
// operation. |serial| is the unique number comes from input events which
// triggers the drag and drop operation.
void StartDrag(DataSource* source,
Surface* origin,
Surface* icon,
ui::DragDropTypes::DragEventSource event_source);
// Sets selection data to the clipboard.
// |source| represents data comes from the client. |serial| is the unique
// number comes from input events which triggers the drag and drop operation.
void SetSelection(DataSource* source, uint32_t serial);
// Overridden from WMHelper::DragDropObserver:
void OnDragEntered(const ui::DropTargetEvent& event) override;
int OnDragUpdated(const ui::DropTargetEvent& event) override;
void OnDragExited() override;
int OnPerformDrop(const ui::DropTargetEvent& event) override;
// Overridden from ui::ClipbaordObserver:
void OnClipboardDataChanged() override;
// Overridden from SeatObserver:
void OnSurfaceFocusing(Surface* surface) override;
void OnSurfaceFocused(Surface* surface) override;
// Overridden from DataOfferObserver:
void OnDataOfferDestroying(DataOffer* data_offer) override;
// Overridden from SurfaceObserver:
void OnSurfaceDestroying(Surface* surface) override;
DataDeviceDelegate* get_delegate() { return delegate_; }
Surface* GetEffectiveTargetForEvent(const ui::DropTargetEvent& event) const;
void SetSelectionToCurrentClipboardData();
DataDeviceDelegate* const delegate_;
Seat* const seat_;
FileHelper* const file_helper_;
std::unique_ptr<ScopedDataOffer> data_offer_;
std::unique_ptr<ScopedSurface> focused_surface_;
} // namespace exo