// Aseprite
// Copyright (C) 2001-2016  David Capello
//
// This program is distributed under the terms of
// the End-User License Agreement for Aseprite.

#ifndef APP_UI_EDITOR_OBSERVER_H_INCLUDED
#define APP_UI_EDITOR_OBSERVER_H_INCLUDED
#pragma once

namespace app {

  class Editor;

  class EditorObserver {
  public:
    virtual ~EditorObserver() { }
    virtual void dispose() { }

    virtual void onDestroyEditor(Editor* editor) { }

    // Called when the editor's state changes.
    virtual void onStateChanged(Editor* editor) { }

    // Called when the scroll or zoom of the editor changes.
    virtual void onScrollChanged(Editor* editor) { }
    virtual void onZoomChanged(Editor* editor) { }

    // Called when the current frame of the editor changes.
    virtual void onBeforeFrameChanged(Editor* editor) { }
    virtual void onAfterFrameChanged(Editor* editor) { }

    // Called when the current layer of the editor changes.
    virtual void onBeforeLayerChanged(Editor* editor) { }
    virtual void onAfterLayerChanged(Editor* editor) { }
  };

} // namespace app

#endif  // APP_UI_EDITOR_OBSERVER_H_INCLUDED
