text: /*
   * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <AK/QuickSort.h>
  #include <LibGUI/Button.h>
  #include <LibGUI/FontPicker.h>
  #include <LibGUI/FontPickerDialogGML.h>
  #include <LibGUI/ItemListModel.h>
  #include <LibGUI/Label.h>
  #include <LibGUI/ListView.h>
  #include <LibGUI/SpinBox.h>
  #include <LibGUI/Widget.h>
  #include <LibGfx/FontDatabase.h>
  
  namespace GUI {
  
  FontPicker::FontPicker(Window* parent_window, const Gfx::Font* current_font, bool fixed_width_only)
      : Dialog(parent_window)
      , m_fixed_width_only(fixed_width_only)
  {
      set_title("Font picker");
      resize(430, 280);
      set_icon(Gfx::Bitmap::try_load_from_file("/res/icons/16x16/app-font-editor.png"));
  
      auto& widget = set_main_widget<GUI::Widget>();
      if (!widget.load_from_gml(font_picker_dialog_gml))
          VERIFY_NOT_REACHED();
  
      m_family_list_view = *widget.find_descendant_of_type_named<ListView>("family_list_view");
      m_family_list_view->set_model(ItemListModel<String>::create(m_families));
      m_family_list_view->horizontal_scrollbar().set_visible(false);
  
      m_variant_list_view = *widget.find_descendant_of_type_named<ListView>("variant_list_view");
      m_variant_list_view->set_model(ItemListModel<String>::create(m_variants));
      m_variant_list_view->horizontal_scrollbar().set_visible(false);
  
      m_size_spin_box = *widget.find_descendant_of_type_named<SpinBox>("size_spin_box");
      m_size_spin_box->set_range(1, 255);
  
      m_size_list_view = *widget.find_descendant_of_type_named<ListView>("size_list_view");
      m_size_list_view->set_model(ItemListModel<int>::create(m_sizes));
      m_size_list_view->horizontal_scrollbar().set_visible(false);
  
      m_sample_text_label = *widget.find_descendant_of_type_named<Label>("sample_text_label");
  
      m_families.clear();
      Gfx::FontDatabase::the().for_each_typeface([&](auto& typeface) {
          if (m_fixed_width_only && !typeface.is_fixed_width())
              return;
          if (!m_families.contains_slow(typeface.family()))
              m_families.append(typeface.family());
      });
      quick_sort(m_families);
  
      m_family_list_view->on_selection_change = [this] {
          const auto& index = m_family_list_view->selection().first();
          m_family = index.data().to_string();
          m_variants.clear();
          Gfx::FontDatabase::the().for_each_typeface([&](auto& typeface) {
              if (m_fixed_width_only && !typeface.is_fixed_width())
                  return;
              if (typeface.family() == m_family.value() && !m_variants.contains_slow(typeface.variant()))
                  m_variants.append(typeface.variant());
          });
          quick_sort(m_variants);
          Optional<size_t> index_of_old_variant_in_new_list;
          if (m_variant.has_value())
              index_of_old_variant_in_new_list = m_variants.find_first_index(m_variant.value());
  
          m_variant_list_view->model()->invalidate();
          m_variant_list_view->set_cursor(m_variant_list_view->model()->index(index_of_old_variant_in_new_list.value_or(0)), GUI::AbstractView::SelectionUpdate::Set);
          update_font();
      };
  
      m_variant_list_view->on_selection_change = [this] {
          const auto& index = m_variant_list_view->selection().first();
          bool font_is_fixed_size = false;
          m_variant = index.data().to_string();
          m_sizes.clear();
          Gfx::FontDatabase::the().for_each_typeface([&](auto& typeface) {
              if (m_fixed_width_only && !typeface.is_fixed_width())
                  return;
              if (typeface.family() == m_family.value() && typeface.variant() == m_variant.value()) {
                  font_is_fixed_size = typeface.is_fixed_size();
                  if (font_is_fixed_size) {
                      m_size_spin_box->set_visible(false);
  
                      typeface.for_each_fixed_size_font([&](auto& font) {
                          m_sizes.append(font.presentation_size());
                      });
                  } else {
                      m_size_spin_box->set_visible(true);
  
                      m_sizes.append(8);
                      m_sizes.append(10);
                      m_sizes.append(12);
                      m_sizes.append(14);
                      m_sizes.append(16);
                      m_sizes.append(18);
                      m_sizes.append(20);
                      m_sizes.append(22);
                      m_sizes.append(24);
                      m_sizes.append(36);
                  }
              }
          });
          quick_sort(m_sizes);
          m_size_list_view->model()->invalidate();
          m_size_list_view->set_selection_mode(GUI::AbstractView::SelectionMode::SingleSelection);
  
          if (m_size.has_value()) {
              Optional<size_t> index_of_old_size_in_new_list = m_sizes.find_first_index(m_size.value());
              if (index_of_old_size_in_new_list.has_value()) {
                  m_size_list_view->set_cursor(m_size_list_view->model()->index(index_of_old_size_in_new_list.value()), GUI::AbstractView::SelectionUpdate::Set);
              } else {
                  if (font_is_fixed_size) {
                      m_size_list_view->set_cursor(m_size_list_view->model()->index(0), GUI::AbstractView::SelectionUpdate::Set);
                  } else {
                      m_size_list_view->set_selection_mode(GUI::AbstractView::SelectionMode::NoSelection);
                      m_size_spin_box->set_value(m_size.value());
                  }
              }
          } else {
              m_size_list_view->set_cursor(m_size_list_view->model()->index(0), GUI::AbstractView::SelectionUpdate::Set);
          }
          update_font();
      };
  
      m_size_list_view->on_selection_change = [this] {
          const auto& index = m_size_list_view->selection().first();
          auto size = index.data().to_i32();
          Optional<size_t> index_of_new_size_in_list = m_sizes.find_first_index(size);
          if (index_of_new_size_in_list.has_value()) {
              m_size_list_view->set_selection_mode(GUI::AbstractView::SelectionMode::SingleSelection);
              m_size = size;
              m_size_spin_box->set_value(m_size.value());
          }
          update_font();
      };
  
      m_size_spin_box->on_change = [this](int value) {
          m_size = value;
  
          Optional<size_t> index_of_new_size_in_list = m_sizes.find_first_index(m_size.value());
  
          if (index_of_new_size_in_list.has_value()) {
              m_size_list_view->set_selection_mode(GUI::AbstractView::SelectionMode::SingleSelection);
              m_size_list_view->set_cursor(m_size_list_view->model()->index(index_of_new_size_in_list.value()), GUI::AbstractView::SelectionUpdate::Set);
          } else {
              m_size_list_view->set_selection_mode(GUI::AbstractView::SelectionMode::NoSelection);
          }
  
          update_font();
      };
  
      auto& ok_button = *widget.find_descendant_of_type_named<GUI::Button>("ok_button");
      ok_button.on_click = [this](auto) {
          done(ExecOK);
      };
  
      auto& cancel_button = *widget.find_descendant_of_type_named<GUI::Button>("cancel_button");
      cancel_button.on_click = [this](auto) {
          done(ExecCancel);
      };
  
      set_font(current_font);
  }
  
  FontPicker::~FontPicker()
  {
  }
  
  void FontPicker::set_font(const Gfx::Font* font)
  {
      if (m_font == font)
          return;
      m_font = font;
      m_sample_text_label->set_font(m_font);
  
      if (!m_font) {
          m_family = {};
          m_variant = {};
          m_size = {};
          m_variants.clear();
          m_sizes.clear();
          m_variant_list_view->model()->invalidate();
          m_size_list_view->model()->invalidate();
          return;
      }
  
      m_family = font->family();
      m_variant = font->variant();
      m_size = font->presentation_size();
  
      auto family_index = m_families.find_first_index(m_font->family());
      if (family_index.has_value())
          m_family_list_view->set_cursor(m_family_list_view->model()->index(family_index.value()), GUI::AbstractView::SelectionUpdate::Set);
  
      auto variant_index = m_variants.find_first_index(m_font->variant());
      if (variant_index.has_value())
          m_variant_list_view->set_cursor(m_variant_list_view->model()->index(variant_index.value()), GUI::AbstractView::SelectionUpdate::Set);
  
      auto size_index = m_sizes.find_first_index(m_font->presentation_size());
      if (size_index.has_value())
          m_size_list_view->set_cursor(m_size_list_view->model()->index(size_index.value()), GUI::AbstractView::SelectionUpdate::Set);
  }
  
  void FontPicker::update_font()
  {
      if (m_family.has_value() && m_size.has_value() && m_variant.has_value()) {
          m_font = Gfx::FontDatabase::the().get(m_family.value(), m_variant.value(), m_size.value());
          m_sample_text_label->set_font(m_font);
      }
  }
  }
  