ash/public/cpp/caption_buttons/frame_caption_delegate.h

// Copyright 2018 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_PUBLIC_CPP_CAPTION_BUTTONS_FRAME_CAPTION_DELEGATE_H_
#define ASH_PUBLIC_CPP_CAPTION_BUTTONS_FRAME_CAPTION_DELEGATE_H_

#include "ash/public/interfaces/ash_window_manager.mojom.h"

namespace aura {
class Window;
}

namespace ash {

// This delegate handles actions to be performed on a top level window. The
// implementation will depend on whether the controls are running in Ash or a
// client.
class FrameCaptionDelegate {
 public:
  // Returns whether the snapping action on the size button should be enabled.
  virtual bool CanSnap(aura::Window* window) = 0;

  // Shows a preview (phantom window) for the given snap direction.
  virtual void ShowSnapPreview(aura::Window* window,
                               mojom::SnapDirection snap) = 0;

  // Snaps the window in the given direction, if not kNone. Destroys the preview
  // window, if any.
  virtual void CommitSnap(aura::Window* window, mojom::SnapDirection snap) = 0;

 protected:
  virtual ~FrameCaptionDelegate() {}
};

}  // namespace ash

#endif  // ASH_PUBLIC_CPP_CAPTION_BUTTONS_FRAME_CAPTION_DELEGATE_H_