text: // Copyright (c) 2021 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 ASH_DRAG_DROP_DRAG_DROP_CAPTURE_DELEGATE_H_
  #define ASH_DRAG_DROP_DRAG_DROP_CAPTURE_DELEGATE_H_
  
  #include "ash/ash_export.h"
  #include "base/bind.h"
  #include "ui/events/gestures/gesture_types.h"
  
  namespace aura {
  class Window;
  }
  
  namespace ui {
  class LocatedEvent;
  }
  
  namespace ash {
  class DragDropTracker;
  
  class ASH_EXPORT DragDropCaptureDelegate {
   public:
    using CancelDragDropCallback = base::RepeatingCallback<void(void)>;
  
    DragDropCaptureDelegate();
  
    DragDropCaptureDelegate(const DragDropCaptureDelegate&) = delete;
    DragDropCaptureDelegate& operator=(const DragDropCaptureDelegate&) = delete;
  
    ~DragDropCaptureDelegate();
  
    // Conditionally takes capture of top level touch events, returning whether
    // this was successful.
    bool TakeCapture(aura::Window* root_window,
                     aura::Window* source_window,
                     CancelDragDropCallback callback,
                     ui::TransferTouchesBehavior behavior);
  
    // Converts an event target that was dispatched against a capture window to
    // once that can be processed by the drag and drop controller.
    //
    // This should only be called on events if TakeCapture returned true at the
    // start of a drag and drop session.
    aura::Window* GetTarget(const ui::LocatedEvent& event);
  
    // Converts an event that was dispatched against a capture window to once
    // that can be processed by the drag and drop controller, using the target
    // returned via GetTarget.
    //
    // This should only be called on events if TakeCapture returned true at the
    // start of a drag and drop session.
    std::unique_ptr<ui::LocatedEvent> ConvertEvent(aura::Window* target,
                                                   const ui::LocatedEvent& event);
  
    // Return the capture window used if TakeCapture returns true.
    aura::Window* capture_window();
  
   private:
    std::unique_ptr<DragDropTracker> drag_drop_tracker_;
  };
  
  }  // namespace ash
  
  #endif  // ASH_DRAG_DROP_DRAG_DROP_CAPTURE_DELEGATE_H_
  