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/GWidget.h>
  
  namespace GUI {
  
  class TabWidget : public Widget {
      C_OBJECT(TabWidget)
  public:
      enum TabPosition {
          Top,
          Bottom,
      };
  
      explicit TabWidget(Widget* parent);
      virtual ~TabWidget() override;
  
      TabPosition tab_position() const { return m_tab_position; }
      void set_tab_position(TabPosition);
  
      int active_tab_index() const;
  
      Widget* active_widget() { return m_active_widget.ptr(); }
      const Widget* active_widget() const { return m_active_widget.ptr(); }
      void set_active_widget(Widget*);
  
      int bar_height() const { return 21; }
      int container_padding() const { return 2; }
  
      void add_widget(const StringView&, Widget*);
  
  protected:
      virtual void paint_event(PaintEvent&) override;
      virtual void child_event(Core::ChildEvent&) override;
      virtual void resize_event(ResizeEvent&) override;
      virtual void mousedown_event(MouseEvent&) override;
      virtual void mousemove_event(MouseEvent&) override;
      virtual void leave_event(Core::Event&) override;
  
  private:
      Gfx::Rect child_rect_for_size(const Gfx::Size&) const;
      Gfx::Rect button_rect(int index) const;
      Gfx::Rect bar_rect() const;
      Gfx::Rect container_rect() const;
      void update_bar();
  
      RefPtr<Widget> m_active_widget;
  
      struct TabData {
          Gfx::Rect rect(const Gfx::Font&) const;
          int width(const Gfx::Font&) const;
          String title;
          Widget* widget { nullptr };
      };
      Vector<TabData> m_tabs;
      TabPosition m_tab_position { TabPosition::Top };
      int m_hovered_tab_index { -1 };
  };
  
  }
  