text: /*
   * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include "PreviewWidget.h"
  #include <AK/StringView.h>
  #include <LibGUI/BoxLayout.h>
  #include <LibGUI/Button.h>
  #include <LibGUI/CheckBox.h>
  #include <LibGUI/Painter.h>
  #include <LibGUI/RadioButton.h>
  #include <LibGUI/Statusbar.h>
  #include <LibGUI/TextEditor.h>
  #include <LibGfx/Bitmap.h>
  #include <LibGfx/WindowTheme.h>
  
  namespace ThemeEditor {
  
  class MiniWidgetGallery final : public GUI::Widget {
      C_OBJECT(MiniWidgetGallery);
  
  public:
      void set_preview_palette(const Gfx::Palette& palette)
      {
          set_palette(palette);
          Function<void(GUI::Widget&)> recurse = [&](GUI::Widget& parent_widget) {
              parent_widget.for_each_child_widget([&](auto& widget) {
                  widget.set_palette(palette);
                  recurse(widget);
                  return IterationDecision::Continue;
              });
          };
          recurse(*this);
      }
  
  private:
      MiniWidgetGallery()
      {
          set_fill_with_background_color(true);
          m_button = add<GUI::Button>();
          m_button->set_text("Button");
          m_checkbox = add<GUI::CheckBox>();
          m_checkbox->set_text("Check box");
          m_radio = add<GUI::RadioButton>();
          m_radio->set_text("Radio button");
          m_statusbar = add<GUI::Statusbar>();
          m_statusbar->set_text("Status bar");
          m_editor = add<GUI::TextEditor>();
          m_editor->set_text("Text editor\nwith multiple\nlines.");
  
          for_each_child_widget([](auto& child) {
              child.set_focus_policy(GUI::FocusPolicy::NoFocus);
              return IterationDecision::Continue;
          });
      }
  
      virtual void resize_event(GUI::ResizeEvent&) override
      {
          m_editor->set_relative_rect(10, 70, 200, 140);
          m_button->set_relative_rect(10, 10, 200, 20);
          m_checkbox->set_relative_rect(10, 30, 200, 20);
          m_radio->set_relative_rect(10, 50, 200, 20);
          m_statusbar->set_relative_rect(0, height() - 16, width(), 16);
      }
  
      RefPtr<GUI::TextEditor> m_editor;
      RefPtr<GUI::Button> m_button;
      RefPtr<GUI::CheckBox> m_checkbox;
      RefPtr<GUI::RadioButton> m_radio;
      RefPtr<GUI::Statusbar> m_statusbar;
  };
  
  PreviewWidget::PreviewWidget(const Gfx::Palette& preview_palette)
      : m_preview_palette(preview_palette)
  {
      m_active_window_icon = Gfx::Bitmap::load_from_file("/res/icons/16x16/window.png");
      m_inactive_window_icon = Gfx::Bitmap::load_from_file("/res/icons/16x16/window.png");
  
      m_close_bitmap = Gfx::Bitmap::load_from_file("/res/icons/16x16/window-close.png");
      m_maximize_bitmap = Gfx::Bitmap::load_from_file("/res/icons/16x16/upward-triangle.png");
      m_minimize_bitmap = Gfx::Bitmap::load_from_file("/res/icons/16x16/downward-triangle.png");
  
      m_gallery = add<MiniWidgetGallery>();
      set_greedy_for_hits(true);
  }
  
  PreviewWidget::~PreviewWidget()
  {
  }
  
  void PreviewWidget::set_preview_palette(const Gfx::Palette& palette)
  {
      m_preview_palette = palette;
      m_gallery->set_preview_palette(palette);
      update();
  }
  
  void PreviewWidget::paint_event(GUI::PaintEvent& event)
  {
      GUI::Frame::paint_event(event);
      GUI::Painter painter(*this);
  
      painter.add_clip_rect(event.rect());
      painter.add_clip_rect(frame_inner_rect());
  
      painter.fill_rect(frame_inner_rect(), m_preview_palette.desktop_background());
  
      struct Button {
          Gfx::IntRect rect;
          RefPtr<Gfx::Bitmap> bitmap;
      };
  
      auto paint_window = [&](auto& title, const Gfx::IntRect& rect, auto state, const Gfx::Bitmap& icon) {
          int window_button_width = m_preview_palette.window_title_button_width();
          int window_button_height = m_preview_palette.window_title_button_height();
          auto titlebar_text_rect = Gfx::WindowTheme::current().titlebar_text_rect(Gfx::WindowTheme::WindowType::Normal, rect, m_preview_palette);
          int pos = titlebar_text_rect.right() + 1;
  
          Vector<Button> buttons;
          buttons.append(Button { {}, m_close_bitmap });
          buttons.append(Button { {}, m_maximize_bitmap });
          buttons.append(Button { {}, m_minimize_bitmap });
  
          for (auto& button : buttons) {
              pos -= window_button_width;
              Gfx::IntRect rect { pos, 0, window_button_width, window_button_height };
              rect.center_vertically_within(titlebar_text_rect);
              button.rect = rect;
          }
  
          auto frame_rect = Gfx::WindowTheme::current().frame_rect_for_window(Gfx::WindowTheme::WindowType::Normal, rect, m_preview_palette, 0);
          Gfx::PainterStateSaver saver(painter);
          painter.translate(frame_rect.location());
          Gfx::WindowTheme::current().paint_normal_frame(painter, state, rect, title, icon, m_preview_palette, buttons.last().rect, 0, false);
  
          for (auto& button : buttons) {
              Gfx::StylePainter::paint_button(painter, button.rect, m_preview_palette, Gfx::ButtonStyle::Normal, false);
              auto bitmap_rect = button.bitmap->rect();
              bitmap_rect.center_within(button.rect);
              painter.blit(bitmap_rect.location(), *button.bitmap, button.bitmap->rect());
          }
      };
  
      Gfx::IntRect active_rect { 0, 0, 320, 240 };
      active_rect.center_within(frame_inner_rect());
      Gfx::IntRect inactive_rect = active_rect.translated(-20, -20);
  
      paint_window("Inactive window", inactive_rect, Gfx::WindowTheme::WindowState::Inactive, *m_active_window_icon);
      paint_window("Active window", active_rect, Gfx::WindowTheme::WindowState::Active, *m_inactive_window_icon);
  }
  
  void PreviewWidget::resize_event(GUI::ResizeEvent&)
  {
      Gfx::IntRect gallery_rect { 0, 0, 320, 240 };
      gallery_rect.center_within(rect());
      m_gallery->set_relative_rect(gallery_rect);
  }
  
  }
  