text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <LibGUI/GFrame.h>
  
  class GLabel;
  class QSLabel;
  
  class QSWidget final : public GFrame {
      C_OBJECT(QSWidget)
  public:
      virtual ~QSWidget() override;
  
      void set_bitmap(NonnullRefPtr<GraphicsBitmap>);
      const GraphicsBitmap* bitmap() const { return m_bitmap.ptr(); }
  
      void set_path(const String&);
      const String& path() const { return m_path; }
  
      Function<void(int)> on_scale_change;
  
  private:
      explicit QSWidget(GWidget* parent = nullptr);
      virtual void paint_event(GPaintEvent&) override;
      virtual void resize_event(GResizeEvent&) override;
      virtual void mousedown_event(GMouseEvent&) override;
      virtual void mouseup_event(GMouseEvent&) override;
      virtual void mousemove_event(GMouseEvent&) override;
      virtual void mousewheel_event(GMouseEvent&) override;
      virtual void drop_event(GDropEvent&) override;
  
      void relayout();
  
      RefPtr<GraphicsBitmap> m_bitmap;
      Rect m_bitmap_rect;
      int m_scale { 100 };
      Point m_pan_origin;
      Point m_pan_bitmap_origin;
      String m_path;
  };
  