newgrf_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "error.h"
#include "settings_gui.h"
#include "newgrf.h"
#include "strings_func.h"
#include "window_func.h"
#include "gamelog.h"
#include "settings_type.h"
#include "settings_func.h"
#include "dropdown_type.h"
#include "dropdown_func.h"
#include "network/network.h"
#include "network/network_content.h"
#include "sortlist_type.h"
#include "stringfilter_type.h"
#include "querystring_gui.h"
#include "core/geometry_func.hpp"
#include "newgrf_text.h"
#include "textfile_gui.h"
#include "tilehighlight_func.h"
#include "fios.h"
#include "timer/timer.h"
#include "timer/timer_window.h"
#include "zoom_func.h"
#include "core/string_consumer.hpp"
 
#include "widgets/newgrf_widget.h"
#include "widgets/misc_widget.h"
 
#include "table/sprites.h"
#include "table/strings.h"
 
#include "safeguards.h"
 
void ShowNewGRFError()
{
  /* Do not show errors when entering the main screen */
  if (_game_mode == GM_MENU) return;
 
  for (const auto &c : _grfconfig) {
    /* Only show Fatal and Error level messages */
    if (c->errors.empty()) continue;
 
    const GRFError &error = c->errors.back();
    if (error.severity != STR_NEWGRF_ERROR_MSG_FATAL && error.severity != STR_NEWGRF_ERROR_MSG_ERROR) continue;
 
    std::vector<StringParameter> params;
    params.emplace_back(c->GetName());
    params.emplace_back(error.message != STR_NULL ? error.message : STR_JUST_RAW_STRING);
    params.emplace_back(error.custom_message);
    params.emplace_back(c->filename);
    params.emplace_back(error.data);
    for (const uint32_t &value : error.param_value) params.emplace_back(value);
 
    if (error.severity == STR_NEWGRF_ERROR_MSG_FATAL) {
      ShowErrorMessage(GetEncodedStringWithArgs(STR_NEWGRF_ERROR_FATAL_POPUP, params), {}, WL_CRITICAL);
    } else {
      ShowErrorMessage(GetEncodedStringWithArgs(STR_NEWGRF_ERROR_POPUP, params), {}, WL_ERROR);
    }
    break;
  }
}
 
static StringID GetGRFPaletteString(uint8_t palette)
{
  if (palette & GRFP_BLT_32BPP) {
    return (palette & GRFP_USE_WINDOWS) ? STR_NEWGRF_SETTINGS_PALETTE_LEGACY_32BPP : STR_NEWGRF_SETTINGS_PALETTE_DEFAULT_32BPP;
  }
  return (palette & GRFP_USE_WINDOWS) ? STR_NEWGRF_SETTINGS_PALETTE_LEGACY : STR_NEWGRF_SETTINGS_PALETTE_DEFAULT;
}
 
static void ShowNewGRFInfo(const GRFConfig &c, const Rect &r, bool show_params)
{
  Rect tr = r.Shrink(WidgetDimensions::scaled.frametext);
  for (const GRFError &error : c.errors) {
    std::array<StringParameter, 3 + std::tuple_size_v<decltype(error.param_value)>> params{};
    auto it = params.begin();
    *it++ = error.custom_message; // is skipped by built-in messages
    *it++ = c.filename;
    *it++ = error.data;
    for (const uint32_t &value : error.param_value) *it++ = value;
 
    tr.top = DrawStringMultiLine(tr, GetString(error.severity, GetStringWithArgs(error.message != STR_NULL ? error.message : STR_JUST_RAW_STRING, {params.begin(), it})));
  }
 
  /* Draw filename or not if it is not known (GRF sent over internet) */
  if (!c.filename.empty()) {
    tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_FILENAME, c.filename));
  }
 
  /* Prepare and draw GRF ID */
  tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_GRF_ID, fmt::format("{:08X}", std::byteswap(c.ident.grfid))));
 
  if ((_settings_client.gui.newgrf_developer_tools || _settings_client.gui.newgrf_show_old_versions) && c.version != 0) {
    tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_VERSION, c.version));
  }
  if ((_settings_client.gui.newgrf_developer_tools || _settings_client.gui.newgrf_show_old_versions) && c.min_loadable_version != 0) {
    tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_MIN_VERSION, c.min_loadable_version));
  }
 
  /* Prepare and draw MD5 sum */
  tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_MD5SUM, FormatArrayAsHex(c.ident.md5sum)));
 
  /* Show GRF parameter list */
  if (show_params) {
    if (!c.param.empty()) {
      tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_PARAMETER, STR_JUST_RAW_STRING, GRFBuildParamList(c)));
    } else {
      tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_PARAMETER, STR_NEWGRF_SETTINGS_PARAMETER_NONE, std::monostate{}));
    }
 
    /* Draw the palette of the NewGRF */
    tr.top = DrawStringMultiLine(tr, GetString(STR_NEWGRF_SETTINGS_PALETTE, GetGRFPaletteString(c.palette)));
  }
 
  /* Show flags */
  if (c.status == GCS_NOT_FOUND)       tr.top = DrawStringMultiLine(tr, STR_NEWGRF_SETTINGS_NOT_FOUND);
  if (c.status == GCS_DISABLED)        tr.top = DrawStringMultiLine(tr, STR_NEWGRF_SETTINGS_DISABLED);
  if (c.flags.Test(GRFConfigFlag::Invalid))    tr.top = DrawStringMultiLine(tr, STR_NEWGRF_SETTINGS_INCOMPATIBLE);
  if (c.flags.Test(GRFConfigFlag::Compatible)) tr.top = DrawStringMultiLine(tr, STR_NEWGRF_COMPATIBLE_LOADED);
 
  /* Draw GRF info if it exists */
  if (auto desc = c.GetDescription(); desc.has_value() && !desc->empty()) {
    tr.top = DrawStringMultiLine(tr, GetString(STR_JUST_RAW_STRING, std::move(*desc)), TC_BLACK);
  } else {
    tr.top = DrawStringMultiLine(tr, STR_NEWGRF_SETTINGS_NO_INFO);
  }
}
 
struct NewGRFParametersWindow : public Window {
  static GRFParameterInfo dummy_parameter_info; 
  GRFConfig &grf_config; 
  int32_t clicked_button = INT32_MAX; 
  bool clicked_increase = false; 
  bool clicked_dropdown = false; 
  bool closing_dropdown = false; 
  int32_t clicked_row = INT32_MAX; 
  int line_height = 0; 
  Scrollbar *vscroll = nullptr;
  bool action14present = false; 
  bool editable = false; 
 
  NewGRFParametersWindow(WindowDesc &desc, bool is_baseset, GRFConfig &c, bool editable) : Window(desc),
    grf_config(c),
    editable(editable)
  {
    this->action14present = (this->grf_config.num_valid_params != GRFConfig::MAX_NUM_PARAMS || !this->grf_config.param_info.empty());
 
    this->CreateNestedTree();
    this->GetWidget<NWidgetCore>(WID_NP_CAPTION)->SetStringTip(is_baseset ? STR_BASEGRF_PARAMETERS_CAPTION : STR_NEWGRF_PARAMETERS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS);
    this->vscroll = this->GetScrollbar(WID_NP_SCROLLBAR);
    this->GetWidget<NWidgetStacked>(WID_NP_SHOW_NUMPAR)->SetDisplayedPlane(this->action14present ? SZSP_HORIZONTAL : 0);
    this->GetWidget<NWidgetStacked>(WID_NP_SHOW_DESCRIPTION)->SetDisplayedPlane(this->action14present ? 0 : SZSP_HORIZONTAL);
    this->FinishInitNested();  // Initializes 'this->line_height' as side effect.
 
    this->SetWidgetDisabledState(WID_NP_RESET, !this->editable);
 
    this->InvalidateData();
  }
 
  static GRFParameterInfo &GetDummyParameterInfo(uint nr)
  {
    dummy_parameter_info.param_nr = nr;
    return dummy_parameter_info;
  }
 
  bool HasParameterInfo(uint nr) const
  {
    return nr < this->grf_config.param_info.size() && this->grf_config.param_info[nr].has_value();
  }
 
  GRFParameterInfo &GetParameterInfo(uint nr) const
  {
    return this->HasParameterInfo(nr) ? this->grf_config.param_info[nr].value() : GetDummyParameterInfo(nr);
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_NP_NUMPAR_DEC:
      case WID_NP_NUMPAR_INC: {
        size.width  = std::max(SETTING_BUTTON_WIDTH / 2, GetCharacterHeight(FS_NORMAL));
        size.height = std::max(SETTING_BUTTON_HEIGHT, GetCharacterHeight(FS_NORMAL));
        break;
      }
 
      case WID_NP_NUMPAR: {
        Dimension d = GetStringBoundingBox(GetString(this->GetWidget<NWidgetCore>(widget)->GetString(), GetParamMaxValue(GRFConfig::MAX_NUM_PARAMS)));
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
 
      case WID_NP_BACKGROUND:
        this->line_height = std::max(SETTING_BUTTON_HEIGHT, GetCharacterHeight(FS_NORMAL)) + padding.height;
 
        resize.width = 1;
        fill.height = resize.height = this->line_height;
        size.height = 5 * this->line_height;
        break;
 
      case WID_NP_DESCRIPTION:
        /* Minimum size of 4 lines. The 500 is the default size of the window. */
        Dimension suggestion = {500U - WidgetDimensions::scaled.frametext.Horizontal(), (uint)GetCharacterHeight(FS_NORMAL) * 4 + WidgetDimensions::scaled.frametext.Vertical()};
        for (const auto &par_info : this->grf_config.param_info) {
          if (!par_info.has_value()) continue;
          auto desc = GetGRFStringFromGRFText(par_info->desc);
          if (!desc.has_value()) continue;
          Dimension d = GetStringMultiLineBoundingBox(*desc, suggestion);
          d.height += WidgetDimensions::scaled.frametext.Vertical();
          suggestion = maxdim(d, suggestion);
        }
        size.height = suggestion.height;
        break;
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    switch (widget) {
      case WID_NP_NUMPAR:
        return GetString(STR_NEWGRF_PARAMETERS_NUM_PARAM, this->vscroll->GetCount());
 
      default:
        return this->Window::GetWidgetString(widget, stringid);
    }
  }
 
  std::pair<StringParameter, StringParameter> GetValueParams(const GRFParameterInfo &par_info, uint32_t value) const
  {
    if (par_info.type == PTYPE_BOOL) return {value != 0 ? STR_CONFIG_SETTING_ON : STR_CONFIG_SETTING_OFF, {}};
 
    auto it = std::ranges::lower_bound(par_info.value_names, value, std::less{}, &GRFParameterInfo::ValueName::first);
    if (it != std::end(par_info.value_names) && it->first == value) {
      if (auto label = GetGRFStringFromGRFText(it->second); label.has_value()) return {STR_JUST_RAW_STRING, *label};
    }
 
    return {STR_JUST_INT, value};
  }
 
  std::string GetSettingString(const GRFParameterInfo &par_info, int i, uint32_t value) const
  {
    auto [param1, param2] = this->GetValueParams(par_info, value);
    auto name = GetGRFStringFromGRFText(par_info.name);
    return name.has_value()
      ? GetString(STR_NEWGRF_PARAMETERS_SETTING, STR_JUST_RAW_STRING, std::string(*name), param1, param2)
      : GetString(STR_NEWGRF_PARAMETERS_SETTING, STR_NEWGRF_PARAMETERS_DEFAULT_NAME, i + 1, param1, param2);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    if (widget == WID_NP_DESCRIPTION) {
      if (!this->HasParameterInfo(this->clicked_row)) return;
      const GRFParameterInfo &par_info = this->GetParameterInfo(this->clicked_row);
      auto desc = GetGRFStringFromGRFText(par_info.desc);
      if (!desc.has_value()) return;
      DrawStringMultiLine(r.Shrink(WidgetDimensions::scaled.framerect), *desc, TC_BLACK);
      return;
    } else if (widget != WID_NP_BACKGROUND) {
      return;
    }
 
    Rect ir = r.Shrink(WidgetDimensions::scaled.frametext, RectPadding::zero);
    bool rtl = _current_text_dir == TD_RTL;
    uint buttons_left = rtl ? ir.right - SETTING_BUTTON_WIDTH : ir.left;
    Rect tr = ir.Indent(SETTING_BUTTON_WIDTH + WidgetDimensions::scaled.hsep_wide, rtl);
 
    int button_y_offset = (this->line_height - SETTING_BUTTON_HEIGHT) / 2;
    int text_y_offset = (this->line_height - GetCharacterHeight(FS_NORMAL)) / 2;
    for (int32_t i = this->vscroll->GetPosition(); this->vscroll->IsVisible(i) && i < this->vscroll->GetCount(); i++) {
      GRFParameterInfo &par_info = this->GetParameterInfo(i);
      uint32_t current_value = this->grf_config.GetValue(par_info);
      bool selected = (i == this->clicked_row);
 
      if (par_info.type == PTYPE_BOOL) {
        DrawBoolButton(buttons_left, ir.top + button_y_offset, COLOUR_YELLOW, COLOUR_MAUVE, current_value != 0, this->editable);
      } else if (par_info.type == PTYPE_UINT_ENUM) {
        if (par_info.complete_labels) {
          DrawDropDownButton(buttons_left, ir.top + button_y_offset, COLOUR_YELLOW, this->clicked_row == i && this->clicked_dropdown, this->editable);
        } else {
          DrawArrowButtons(buttons_left, ir.top + button_y_offset, COLOUR_YELLOW, (this->clicked_button == i) ? 1 + (this->clicked_increase != rtl) : 0, this->editable && current_value > par_info.min_value, this->editable && current_value < par_info.max_value);
        }
      }
 
      DrawString(tr.left, tr.right, ir.top + text_y_offset, this->GetSettingString(par_info, i, current_value), selected ? TC_WHITE : TC_LIGHT_BLUE);
      ir.top += this->line_height;
    }
  }
 
  void OnPaint() override
  {
    if (this->closing_dropdown) {
      this->closing_dropdown = false;
      this->clicked_dropdown = false;
    }
    this->DrawWidgets();
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_NP_NUMPAR_DEC:
        if (this->editable && !this->action14present && !this->grf_config.param.empty()) {
          this->grf_config.param.pop_back();
          this->InvalidateData();
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_NEWGRF_STATE);
        }
        break;
 
      case WID_NP_NUMPAR_INC:
        if (this->editable && !this->action14present && this->grf_config.param.size() < this->grf_config.num_valid_params) {
          this->grf_config.param.emplace_back(0);
          this->InvalidateData();
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_NEWGRF_STATE);
        }
        break;
 
      case WID_NP_BACKGROUND: {
        if (!this->editable) break;
        int32_t num = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NP_BACKGROUND);
        if (num >= this->vscroll->GetCount()) break;
 
        if (this->clicked_row != num) {
          this->CloseChildWindows(WC_QUERY_STRING);
          this->CloseChildWindows(WC_DROPDOWN_MENU);
          this->clicked_row = num;
          this->clicked_dropdown = false;
        }
 
        Rect r = this->GetWidget<NWidgetBase>(widget)->GetCurrentRect().Shrink(WidgetDimensions::scaled.frametext, RectPadding::zero);
        int x = pt.x - r.left;
        if (_current_text_dir == TD_RTL) x = r.Width() - 1 - x;
 
        GRFParameterInfo &par_info = this->GetParameterInfo(num);
 
        /* One of the arrows is clicked */
        uint32_t old_val = this->grf_config.GetValue(par_info);
        if (par_info.type != PTYPE_BOOL && IsInsideMM(x, 0, SETTING_BUTTON_WIDTH) && par_info.complete_labels) {
          if (this->clicked_dropdown) {
            /* unclick the dropdown */
            this->CloseChildWindows(WC_DROPDOWN_MENU);
            this->clicked_dropdown = false;
            this->closing_dropdown = false;
          } else {
            int rel_y = (pt.y - r.top) % this->line_height;
 
            Rect wi_rect;
            wi_rect.left = pt.x - (_current_text_dir == TD_RTL ? SETTING_BUTTON_WIDTH - 1 - x : x);;
            wi_rect.right = wi_rect.left + SETTING_BUTTON_WIDTH - 1;
            wi_rect.top = pt.y - rel_y + (this->line_height - SETTING_BUTTON_HEIGHT) / 2;
            wi_rect.bottom = wi_rect.top + SETTING_BUTTON_HEIGHT - 1;
 
            /* For dropdowns we also have to check the y position thoroughly, the mouse may not above the just opening dropdown */
            if (pt.y >= wi_rect.top && pt.y <= wi_rect.bottom) {
              this->clicked_dropdown = true;
              this->closing_dropdown = false;
 
              DropDownList list;
              for (const auto &[value, name] : par_info.value_names) {
                auto text = GetGRFStringFromGRFText(name);
                assert(text.has_value()); // ensured by "complete_labels"
                list.push_back(MakeDropDownListStringItem(GetString(STR_JUST_RAW_STRING, std::string(*text)), value));
              }
 
              ShowDropDownListAt(this, std::move(list), old_val, WID_NP_SETTING_DROPDOWN, wi_rect, COLOUR_ORANGE);
            }
          }
        } else if (IsInsideMM(x, 0, SETTING_BUTTON_WIDTH)) {
          uint32_t val = old_val;
          if (par_info.type == PTYPE_BOOL) {
            val = !val;
          } else {
            if (x >= SETTING_BUTTON_WIDTH / 2) {
              /* Increase button clicked */
              if (val < par_info.max_value) val++;
              this->clicked_increase = true;
            } else {
              /* Decrease button clicked */
              if (val > par_info.min_value) val--;
              this->clicked_increase = false;
            }
          }
          if (val != old_val) {
            this->grf_config.SetValue(par_info, val);
 
            this->clicked_button = num;
            this->unclick_timeout.Reset();
          }
        } else if (par_info.type == PTYPE_UINT_ENUM && !par_info.complete_labels && click_count >= 2) {
          /* Display a query box so users can enter a custom value. */
          ShowQueryString(GetString(STR_JUST_INT, old_val), STR_CONFIG_SETTING_QUERY_CAPTION, 10, this, CS_NUMERAL, {});
        }
        this->SetDirty();
        break;
      }
 
      case WID_NP_RESET:
        if (!this->editable) break;
        this->grf_config.SetParameterDefaults();
        this->InvalidateData();
        SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_NEWGRF_STATE);
        break;
    }
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    if (!str.has_value() || str->empty()) return;
    auto value = ParseInteger<int32_t>(*str, 10, true);
    if (!value.has_value()) return;
    GRFParameterInfo &par_info = this->GetParameterInfo(this->clicked_row);
    this->grf_config.SetValue(par_info, *value);
    this->SetDirty();
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    if (widget != WID_NP_SETTING_DROPDOWN) return;
    assert(this->clicked_dropdown);
    GRFParameterInfo &par_info = this->GetParameterInfo(this->clicked_row);
    this->grf_config.SetValue(par_info, index);
    this->SetDirty();
  }
 
  void OnDropdownClose(Point, WidgetID widget, int, int, bool) override
  {
    if (widget != WID_NP_SETTING_DROPDOWN) return;
    /* We cannot raise the dropdown button just yet. OnClick needs some hint, whether
     * the same dropdown button was clicked again, and then not open the dropdown again.
     * So, we only remember that it was closed, and process it on the next OnPaint, which is
     * after OnClick. */
    assert(this->clicked_dropdown);
    this->closing_dropdown = true;
    this->SetDirty();
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_NP_BACKGROUND);
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
    if (!this->action14present) {
      this->SetWidgetDisabledState(WID_NP_NUMPAR_DEC, !this->editable || this->grf_config.param.empty());
      this->SetWidgetDisabledState(WID_NP_NUMPAR_INC, !this->editable || std::size(this->grf_config.param) >= this->grf_config.num_valid_params);
    }
 
    this->vscroll->SetCount(this->action14present ? this->grf_config.num_valid_params : this->grf_config.param.size());
    if (this->clicked_row != INT32_MAX && this->clicked_row >= this->vscroll->GetCount()) {
      this->clicked_row = INT32_MAX;
      this->CloseChildWindows(WC_QUERY_STRING);
    }
  }
 
  TimeoutTimer<TimerWindow> unclick_timeout = {std::chrono::milliseconds(150), [this]() {
    this->clicked_button = INT32_MAX;
    this->SetDirty();
  }};
};
GRFParameterInfo NewGRFParametersWindow::dummy_parameter_info(0);
 
 
static constexpr NWidgetPart _nested_newgrf_parameter_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_MAUVE),
    NWidget(WWT_CAPTION, COLOUR_MAUVE, WID_NP_CAPTION),
    NWidget(WWT_DEFSIZEBOX, COLOUR_MAUVE),
  EndContainer(),
  NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NP_SHOW_NUMPAR),
    NWidget(WWT_PANEL, COLOUR_MAUVE), SetResize(1, 0), SetFill(1, 0), SetPIP(4, 0, 4),
      NWidget(NWID_HORIZONTAL), SetPIP(4, 0, 4),
        NWidget(WWT_PUSHARROWBTN, COLOUR_YELLOW, WID_NP_NUMPAR_DEC), SetMinimalSize(12, 12), SetArrowWidgetTypeTip(AWV_DECREASE),
        NWidget(WWT_PUSHARROWBTN, COLOUR_YELLOW, WID_NP_NUMPAR_INC), SetMinimalSize(12, 12), SetArrowWidgetTypeTip(AWV_INCREASE),
        NWidget(WWT_TEXT, INVALID_COLOUR, WID_NP_NUMPAR), SetResize(1, 0), SetFill(1, 0), SetPadding(0, 0, 0, 4),
      EndContainer(),
    EndContainer(),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_MATRIX, COLOUR_MAUVE, WID_NP_BACKGROUND), SetMinimalSize(188, 182), SetResize(1, 1), SetFill(1, 0), SetMatrixDataTip(1, 0), SetScrollbar(WID_NP_SCROLLBAR),
    NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, WID_NP_SCROLLBAR),
  EndContainer(),
  NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NP_SHOW_DESCRIPTION),
    NWidget(WWT_PANEL, COLOUR_MAUVE, WID_NP_DESCRIPTION), SetResize(1, 0), SetFill(1, 0),
    EndContainer(),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, WID_NP_RESET), SetStringTip(STR_NEWGRF_PARAMETERS_RESET, STR_NEWGRF_PARAMETERS_RESET_TOOLTIP),
    NWidget(WWT_PANEL, COLOUR_MAUVE), SetResize(1, 0), SetFill(1, 0),
    EndContainer(),
    NWidget(WWT_RESIZEBOX, COLOUR_MAUVE),
  EndContainer(),
};
 
static WindowDesc _newgrf_parameters_desc(
  WDP_CENTER, "settings_newgrf_config", 500, 208,
  WC_GRF_PARAMETERS, WC_NONE,
  {},
  _nested_newgrf_parameter_widgets
);
 
void OpenGRFParameterWindow(bool is_baseset, GRFConfig &c, bool editable)
{
  CloseWindowByClass(WC_GRF_PARAMETERS);
  new NewGRFParametersWindow(_newgrf_parameters_desc, is_baseset, c, editable);
}
 
struct NewGRFTextfileWindow : public TextfileWindow {
  const GRFConfig *grf_config = nullptr; 
 
  NewGRFTextfileWindow(Window *parent, TextfileType file_type, const GRFConfig *c) : TextfileWindow(parent, file_type), grf_config(c)
  {
    this->ConstructWindow();
 
    auto textfile = this->grf_config->GetTextfile(file_type);
    this->LoadTextfile(textfile.value(), NEWGRF_DIR);
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_TF_CAPTION) {
      return GetString(stringid, STR_CONTENT_TYPE_NEWGRF, this->grf_config->GetName());
    }
 
    return this->Window::GetWidgetString(widget, stringid);
  }
};
 
void ShowNewGRFTextfileWindow(Window *parent, TextfileType file_type, const GRFConfig *c)
{
  parent->CloseChildWindowById(WC_TEXTFILE, file_type);
  new NewGRFTextfileWindow(parent, file_type, c);
}
 
typedef std::map<uint32_t, const GRFConfig *> GrfIdMap; 
 
static void FillGrfidMap(const GRFConfigList &lst, GrfIdMap &grfid_map)
{
  for (const auto &c : lst) {
    grfid_map.emplace(c->ident.grfid, c.get());
  }
}
 
static void NewGRFConfirmationCallback(Window *w, bool confirmed);
static void ShowSavePresetWindow(std::string_view initial_text);
 
struct NewGRFWindow : public Window, NewGRFScanCallback {
  typedef GUIList<const GRFConfig *, std::nullptr_t, StringFilter &> GUIGRFConfigList;
 
  static const uint EDITBOX_MAX_SIZE   =  50;
 
  static Listing   last_sorting;   
  static Filtering last_filtering; 
  static const std::initializer_list<GUIGRFConfigList::SortFunction   * const> sorter_funcs; 
  static const std::initializer_list<GUIGRFConfigList::FilterFunction * const> filter_funcs; 
 
  GUIGRFConfigList avails{}; 
  const GRFConfig *avail_sel = nullptr; 
  int avail_pos = -1; 
  StringFilter string_filter{}; 
  QueryString filter_editbox; 
 
  StringList grf_presets{}; 
 
  GRFConfigList actives{}; 
  GRFConfig *active_sel = nullptr; 
 
  GRFConfigList &orig_list; 
  bool editable = false; 
  bool show_params = false; 
  bool execute = false; 
  int preset = -1; 
  int active_over = -1; 
  bool modified = false; 
 
  Scrollbar *vscroll = nullptr;
  Scrollbar *vscroll2 = nullptr;
 
  NewGRFWindow(WindowDesc &desc, bool editable, bool show_params, bool execute, GRFConfigList &orig_list) : Window(desc), filter_editbox(EDITBOX_MAX_SIZE), orig_list(orig_list)
  {
    this->editable    = editable;
    this->execute     = execute;
    this->show_params = show_params;
 
    CopyGRFConfigList(this->actives, orig_list, false);
    this->grf_presets = GetGRFPresetList();
 
    this->CreateNestedTree();
    this->vscroll = this->GetScrollbar(WID_NS_SCROLLBAR);
    this->vscroll2 = this->GetScrollbar(WID_NS_SCROLL2BAR);
 
    this->GetWidget<NWidgetStacked>(WID_NS_SHOW_REMOVE)->SetDisplayedPlane(this->editable ? 0 : 1);
    this->GetWidget<NWidgetStacked>(WID_NS_SHOW_EDIT)->SetDisplayedPlane(this->editable ? 0 : (this->show_params ? 1 : SZSP_HORIZONTAL));
    this->GetWidget<NWidgetStacked>(WID_NS_SHOW_APPLY)->SetDisplayedPlane(this->editable && this->execute ? 0 : SZSP_VERTICAL);
    this->FinishInitNested(WN_GAME_OPTIONS_NEWGRF_STATE);
 
    this->querystrings[WID_NS_FILTER] = &this->filter_editbox;
    this->filter_editbox.cancel_button = QueryString::ACTION_CLEAR;
    if (editable) {
      this->SetFocusedWidget(WID_NS_FILTER);
    } else {
      this->DisableWidget(WID_NS_FILTER);
    }
 
    this->avails.SetListing(this->last_sorting);
    this->avails.SetFiltering(this->last_filtering);
    this->avails.SetSortFuncs(this->sorter_funcs);
    this->avails.SetFilterFuncs(this->filter_funcs);
    this->avails.ForceRebuild();
 
    this->OnInvalidateData(GOID_NEWGRF_CURRENT_LOADED);
  }
 
  void Close([[maybe_unused]] int data = 0) override
  {
    CloseWindowByClass(WC_GRF_PARAMETERS);
    CloseWindowByClass(WC_SAVE_PRESET);
 
    if (this->editable && this->modified && !this->execute && !_exit_game) {
      CopyGRFConfigList(this->orig_list, this->actives, true);
      ResetGRFConfig(false);
      ReloadNewGRFData();
    }
 
    this->Window::Close();
  }
 
  int GetCurrentActivePosition() const
  {
    if (this->active_sel != nullptr) {
      auto it = std::ranges::find_if(this->actives, [this](const auto &c) { return c.get() == this->active_sel; });
      if (it != std::end(this->actives)) return static_cast<int>(std::distance(std::begin(this->actives), it));
    }
    return -1;
  }
 
  bool CanUpgradeCurrent()
  {
    GrfIdMap grfid_map;
    FillGrfidMap(this->actives, grfid_map);
 
    for (const auto &a : _all_grfs) {
      GrfIdMap::const_iterator iter = grfid_map.find(a->ident.grfid);
      if (iter != grfid_map.end() && a->version > iter->second->version) return true;
    }
    return false;
  }
 
  void UpgradeCurrent()
  {
    GrfIdMap grfid_map;
    FillGrfidMap(this->actives, grfid_map);
 
    for (const auto &a : _all_grfs) {
      GrfIdMap::iterator iter = grfid_map.find(a->ident.grfid);
      if (iter == grfid_map.end() || iter->second->version >= a->version) continue;
 
      auto c = std::ranges::find_if(this->actives, [&iter](const auto &grfconfig) { return grfconfig.get() == iter->second; });
      assert(c != std::end(this->actives));
      auto d = std::make_unique<GRFConfig>(*a);
      if (d->IsCompatible((*c)->version)) {
        d->CopyParams(**c);
      } else {
        d->SetParameterDefaults();
      }
      if (this->active_sel == c->get()) {
        CloseWindowByClass(WC_GRF_PARAMETERS);
        this->CloseChildWindows(WC_TEXTFILE);
        this->active_sel = nullptr;
      }
      *c = std::move(d);
      iter->second = c->get();
    }
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_NS_FILE_LIST:
      {
        Dimension d = maxdim(GetScaledSpriteSize(SPR_SQUARE), GetScaledSpriteSize(SPR_WARNING_SIGN));
        fill.height = resize.height = std::max<uint>(d.height + 2U, GetCharacterHeight(FS_NORMAL));
        size.height = std::max(size.height, padding.height + 6 * resize.height);
        break;
      }
 
      case WID_NS_AVAIL_LIST:
      {
        Dimension d = maxdim(GetScaledSpriteSize(SPR_SQUARE), GetScaledSpriteSize(SPR_WARNING_SIGN));
        fill.height = resize.height = std::max<uint>(d.height + 2U, GetCharacterHeight(FS_NORMAL));
        size.height = std::max(size.height, padding.height + 8 * resize.height);
        break;
      }
 
      case WID_NS_NEWGRF_INFO_TITLE: {
        Dimension dim = GetStringBoundingBox(STR_NEWGRF_SETTINGS_INFO_TITLE);
        size.height = std::max(size.height, dim.height + WidgetDimensions::scaled.frametext.Vertical());
        size.width  = std::max(size.width,  dim.width  + WidgetDimensions::scaled.frametext.Horizontal());
        break;
      }
 
      case WID_NS_NEWGRF_INFO:
        size.height = std::max<uint>(size.height, WidgetDimensions::scaled.framerect.Vertical() + 10 * GetCharacterHeight(FS_NORMAL));
        break;
 
      case WID_NS_PRESET_LIST: {
        Dimension d = GetStringBoundingBox(STR_NUM_CUSTOM);
        for (const auto &i : this->grf_presets) {
          d = maxdim(d, GetStringBoundingBox(GetString(STR_JUST_RAW_STRING, i)));
        }
        d.width += padding.width;
        size = maxdim(d, size);
        break;
      }
 
      case WID_NS_CONTENT_DOWNLOAD:
      case WID_NS_CONTENT_DOWNLOAD2: {
        Dimension d = GetStringBoundingBox(STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON);
        size = maxdim(d, GetStringBoundingBox(STR_INTRO_ONLINE_CONTENT));
        size.width  += padding.width;
        size.height += padding.height;
        break;
      }
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_NS_FILE_LIST, WidgetDimensions::scaled.framerect.Vertical());
    this->vscroll2->SetCapacityFromWidget(this, WID_NS_AVAIL_LIST, WidgetDimensions::scaled.framerect.Vertical());
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    switch (widget) {
      case WID_NS_PRESET_LIST:
        if (this->preset == -1) return GetString(STR_NUM_CUSTOM);
 
        return this->grf_presets[this->preset];
 
      default:
        return this->Window::GetWidgetString(widget, stringid);
    }
  }
 
  inline PaletteID GetPalette(const GRFConfig &c) const
  {
    PaletteID pal;
 
    /* Pick a colour */
    switch (c.status) {
      case GCS_NOT_FOUND:
      case GCS_DISABLED:
        pal = PALETTE_TO_RED;
        break;
      case GCS_ACTIVATED:
        pal = PALETTE_TO_GREEN;
        break;
      default:
        pal = PALETTE_TO_BLUE;
        break;
    }
 
    /* Do not show a "not-failure" colour when it actually failed to load */
    if (pal != PALETTE_TO_RED) {
      if (c.flags.Test(GRFConfigFlag::Static)) {
        pal = PALETTE_TO_GREY;
      } else if (c.flags.Test(GRFConfigFlag::Compatible)) {
        pal = PALETTE_TO_ORANGE;
      }
    }
 
    return pal;
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_NS_FILE_LIST: {
        const Rect br = r.Shrink(WidgetDimensions::scaled.bevel);
        GfxFillRect(br, PC_BLACK);
 
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
        uint step_height = this->GetWidget<NWidgetBase>(WID_NS_FILE_LIST)->resize_y;
        Dimension square = GetSpriteSize(SPR_SQUARE);
        Dimension warning = GetSpriteSize(SPR_WARNING_SIGN);
        int square_offset_y = (step_height - square.height) / 2;
        int warning_offset_y = (step_height - warning.height) / 2;
        int offset_y = (step_height - GetCharacterHeight(FS_NORMAL)) / 2;
 
        bool rtl = _current_text_dir == TD_RTL;
        uint text_left    = rtl ? tr.left : tr.left + square.width + 13;
        uint text_right   = rtl ? tr.right - square.width - 13 : tr.right;
        uint square_left  = rtl ? tr.right - square.width - 3 : tr.left + 3;
        uint warning_left = rtl ? tr.right - square.width - warning.width - 8 : tr.left + square.width + 8;
 
        int i = 0;
        for (const auto &c : this->actives) {
          if (this->vscroll->IsVisible(i)) {
            std::string text = c->GetName();
            bool h = (this->active_sel == c.get());
            PaletteID pal = this->GetPalette(*c);
 
            if (h) {
              GfxFillRect(br.left, tr.top, br.right, tr.top + step_height - 1, PC_DARK_BLUE);
            } else if (i == this->active_over) {
              /* Get index of current selection. */
              int active_sel_pos = this->GetCurrentActivePosition();
              if (active_sel_pos != this->active_over) {
                uint top = (active_sel_pos < 0 || this->active_over < active_sel_pos) ? tr.top + 1 : tr.top + step_height - 2;
                GfxFillRect(tr.left, top - 1, tr.right, top + 1, PC_GREY);
              }
            }
            DrawSprite(SPR_SQUARE, pal, square_left, tr.top + square_offset_y);
            if (!c->errors.empty()) DrawSprite(SPR_WARNING_SIGN, 0, warning_left, tr.top + warning_offset_y);
            uint txtoffset = c->errors.empty() ? 0 : warning.width;
            DrawString(text_left + (rtl ? 0 : txtoffset), text_right - (rtl ? txtoffset : 0), tr.top + offset_y, std::move(text), h ? TC_WHITE : TC_ORANGE);
            tr.top += step_height;
          }
          i++;
        }
        if (i == this->active_over && this->vscroll->IsVisible(i)) { // Highlight is after the last GRF entry.
          GfxFillRect(tr.left, tr.top, tr.right, tr.top + 2, PC_GREY);
        }
        break;
      }
 
      case WID_NS_AVAIL_LIST: {
        const Rect br = r.Shrink(WidgetDimensions::scaled.bevel);
        GfxFillRect(br, this->active_over == -2 ? PC_DARK_GREY : PC_BLACK);
 
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
        uint step_height = this->GetWidget<NWidgetBase>(WID_NS_AVAIL_LIST)->resize_y;
        int offset_y = (step_height - GetCharacterHeight(FS_NORMAL)) / 2;
 
        auto [first, last] = this->vscroll2->GetVisibleRangeIterators(this->avails);
        for (auto it = first; it != last; ++it) {
          const GRFConfig *c = *it;
          bool h = (c == this->avail_sel);
          std::string text = c->GetName();
 
          if (h) GfxFillRect(br.left, tr.top, br.right, tr.top + step_height - 1, PC_DARK_BLUE);
          DrawString(tr.left, tr.right, tr.top + offset_y, std::move(text), h ? TC_WHITE : TC_SILVER);
          tr.top += step_height;
        }
        break;
      }
 
      case WID_NS_NEWGRF_INFO_TITLE: {
        /* Create the nice darker rectangle at the details top. */
        GfxFillRect(r.Shrink(WidgetDimensions::scaled.bevel), GetColourGradient(COLOUR_MAUVE, SHADE_NORMAL));
        DrawString(r.left, r.right, CentreBounds(r.top, r.bottom, GetCharacterHeight(FS_NORMAL)), STR_NEWGRF_SETTINGS_INFO_TITLE, TC_FROMSTRING, SA_HOR_CENTER);
        break;
      }
 
      case WID_NS_NEWGRF_INFO: {
        const GRFConfig *selected = this->active_sel;
        if (selected == nullptr) selected = this->avail_sel;
        if (selected != nullptr) {
          ShowNewGRFInfo(*selected, r, this->show_params);
        }
        break;
      }
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    if (widget >= WID_NS_NEWGRF_TEXTFILE && widget < WID_NS_NEWGRF_TEXTFILE + TFT_CONTENT_END) {
      if (this->active_sel == nullptr && this->avail_sel == nullptr) return;
 
      ShowNewGRFTextfileWindow(this, (TextfileType)(widget - WID_NS_NEWGRF_TEXTFILE), this->active_sel != nullptr ? this->active_sel : this->avail_sel);
      return;
    }
 
    switch (widget) {
      case WID_NS_PRESET_LIST: {
        DropDownList list;
 
        /* Add 'None' option for clearing list */
        list.push_back(MakeDropDownListStringItem(STR_NONE, -1));
 
        for (uint i = 0; i < this->grf_presets.size(); i++) {
          list.push_back(MakeDropDownListStringItem(std::string{this->grf_presets[i]}, i));
        }
 
        this->CloseChildWindows(WC_QUERY_STRING); // Remove the parameter query window
        ShowDropDownList(this, std::move(list), this->preset, WID_NS_PRESET_LIST);
        break;
      }
 
      case WID_NS_OPEN_URL: {
        const GRFConfig *c = (this->avail_sel == nullptr) ? this->active_sel : this->avail_sel;
        auto url = c->GetURL();
        if (url.has_value()) OpenBrowser(std::move(*url));
        break;
      }
 
      case WID_NS_PRESET_SAVE:
        ShowSavePresetWindow((this->preset == -1) ? std::string_view{} : this->grf_presets[this->preset]);
        break;
 
      case WID_NS_PRESET_DELETE:
        if (this->preset == -1) return;
 
        DeleteGRFPresetFromConfig(this->grf_presets[this->preset]);
        this->grf_presets = GetGRFPresetList();
        this->preset = -1;
        this->InvalidateData();
        this->CloseChildWindows(WC_QUERY_STRING); // Remove the parameter query window
        break;
 
      case WID_NS_MOVE_UP: { // Move GRF up
        if (this->active_sel == nullptr || !this->editable) break;
 
        int pos = this->GetCurrentActivePosition();
        if (pos <= 0) break;
 
        std::swap(this->actives[pos - 1], this->actives[pos]);
 
        this->vscroll->ScrollTowards(pos - 1);
        this->preset = -1;
        this->InvalidateData(GOID_NEWGRF_LIST_EDITED);
        break;
      }
 
      case WID_NS_MOVE_DOWN: { // Move GRF down
        if (this->active_sel == nullptr || !this->editable) break;
 
        int pos = this->GetCurrentActivePosition();
        if (pos == -1 || static_cast<size_t>(pos) >= this->actives.size() - 1) break;
 
        std::swap(this->actives[pos], this->actives[pos + 1]);
 
        this->vscroll->ScrollTowards(pos + 1);
        this->preset = -1;
        this->InvalidateData(GOID_NEWGRF_LIST_EDITED);
        break;
      }
 
      case WID_NS_FILE_LIST: { // Select an active GRF.
        ResetObjectToPlace();
 
        const GRFConfig *old_sel = this->active_sel;
        uint i = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NS_FILE_LIST, WidgetDimensions::scaled.framerect.top);
        if (i < this->actives.size()) {
          this->active_sel = this->actives[i].get();
        } else {
          this->active_sel = nullptr;
        }
        if (this->active_sel != old_sel) {
          CloseWindowByClass(WC_GRF_PARAMETERS);
          this->CloseChildWindows(WC_TEXTFILE);
        }
        this->avail_sel = nullptr;
        this->avail_pos = -1;
 
        this->InvalidateData();
        if (click_count == 1) {
          if (this->editable && this->active_sel != nullptr) SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
          break;
        }
        /* With double click, continue */
        [[fallthrough]];
      }
 
      case WID_NS_REMOVE: { // Remove GRF
        if (this->active_sel == nullptr || !this->editable) break;
        CloseWindowByClass(WC_GRF_PARAMETERS);
        this->CloseChildWindows(WC_TEXTFILE);
 
        /* Choose the next GRF file to be the selected file. */
        int pos = this->GetCurrentActivePosition();
        if (pos < 0) break;
 
        auto it = std::next(std::begin(this->actives), pos);
        it = this->actives.erase(it);
        if (this->actives.empty()) {
          this->active_sel = nullptr;
        } else if (it == std::end(this->actives)) {
          this->active_sel = this->actives.back().get();
        } else {
          this->active_sel = it->get();
        }
        this->preset = -1;
        this->avail_pos = -1;
        this->avail_sel = nullptr;
        this->avails.ForceRebuild();
        this->InvalidateData(GOID_NEWGRF_LIST_EDITED);
        break;
      }
 
      case WID_NS_UPGRADE: { // Upgrade GRF.
        if (!this->editable || this->actives.empty()) break;
        UpgradeCurrent();
        this->InvalidateData(GOID_NEWGRF_LIST_EDITED);
        break;
      }
 
      case WID_NS_AVAIL_LIST: { // Select a non-active GRF.
        ResetObjectToPlace();
 
        auto it = this->vscroll2->GetScrolledItemFromWidget(this->avails, pt.y, this, WID_NS_AVAIL_LIST, WidgetDimensions::scaled.framerect.top);
        this->active_sel = nullptr;
        CloseWindowByClass(WC_GRF_PARAMETERS);
        if (it != std::end(this->avails)) {
          if (this->avail_sel != *it) this->CloseChildWindows(WC_TEXTFILE);
          this->avail_sel = *it;
          this->avail_pos = static_cast<int>(std::distance(std::begin(this->avails), it));
        }
        this->InvalidateData();
        if (click_count == 1) {
          if (this->editable && this->avail_sel != nullptr && !this->avail_sel->flags.Test(GRFConfigFlag::Invalid)) SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
          break;
        }
        /* With double click, continue */
        [[fallthrough]];
      }
 
      case WID_NS_ADD:
        if (this->avail_sel == nullptr || !this->editable || this->avail_sel->flags.Test(GRFConfigFlag::Invalid)) break;
 
        this->AddGRFToActive();
        break;
 
      case WID_NS_APPLY_CHANGES: // Apply changes made to GRF list
        if (!this->editable) break;
 
        ShowQuery(
          GetEncodedString(STR_NEWGRF_POPUP_CAUTION_CAPTION),
          GetEncodedString(STR_NEWGRF_CONFIRMATION_TEXT),
          this,
          NewGRFConfirmationCallback
        );
 
        this->CloseChildWindows(WC_QUERY_STRING); // Remove the parameter query window
        break;
 
      case WID_NS_VIEW_PARAMETERS:
      case WID_NS_SET_PARAMETERS: { // Edit parameters
        if (this->active_sel == nullptr || !this->show_params || this->active_sel->num_valid_params == 0) break;
 
        OpenGRFParameterWindow(false, *this->active_sel, this->editable);
        this->InvalidateData(GOID_NEWGRF_CHANGES_MADE);
        break;
      }
 
      case WID_NS_TOGGLE_PALETTE:
        if (this->active_sel != nullptr && this->editable) {
          this->active_sel->palette ^= GRFP_USE_MASK;
          this->SetDirty();
          this->InvalidateData(GOID_NEWGRF_CHANGES_MADE);
        }
        break;
 
      case WID_NS_CONTENT_DOWNLOAD:
      case WID_NS_CONTENT_DOWNLOAD2:
        if (!_network_available) {
          ShowErrorMessage(GetEncodedString(STR_NETWORK_ERROR_NOTAVAILABLE), {}, WL_ERROR);
        } else {
          this->CloseChildWindows(WC_QUERY_STRING); // Remove the parameter query window
 
          ShowMissingContentWindow(this->actives);
        }
        break;
 
      case WID_NS_RESCAN_FILES:
      case WID_NS_RESCAN_FILES2:
        RequestNewGRFScan(this);
        break;
    }
  }
 
  void OnNewGRFsScanned() override
  {
    if (this->active_sel == nullptr) this->CloseChildWindows(WC_TEXTFILE);
    this->avail_sel = nullptr;
    this->avail_pos = -1;
    this->avails.ForceRebuild();
    this->CloseChildWindows(WC_QUERY_STRING); // Remove the parameter query window
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    if (widget != WID_NS_PRESET_LIST) return;
    if (!this->editable) return;
 
    ClearGRFConfigList(this->actives);
    this->preset = index;
 
    if (index != -1) {
      this->actives = LoadGRFPresetFromConfig(this->grf_presets[index]);
    }
    this->avails.ForceRebuild();
 
    ResetObjectToPlace();
    CloseWindowByClass(WC_GRF_PARAMETERS);
    this->CloseChildWindows(WC_TEXTFILE);
    this->active_sel = nullptr;
    this->InvalidateData(GOID_NEWGRF_CHANGES_MADE);
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    if (!str.has_value()) return;
 
    SaveGRFPresetToConfig(*str, this->actives);
    this->grf_presets = GetGRFPresetList();
 
    /* Switch to this preset */
    for (uint i = 0; i < this->grf_presets.size(); i++) {
      if (this->grf_presets[i] == str) {
        this->preset = i;
        break;
      }
    }
 
    this->InvalidateData();
  }
 
  void UpdateScrollBars()
  {
    /* Update scrollbars */
    this->vscroll->SetCount(this->actives.size() + 1); // Reserve empty space for drag and drop handling.
 
    if (this->avail_pos >= 0) this->vscroll2->ScrollTowards(this->avail_pos);
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
    switch (data) {
      default:
        /* Nothing important to do */
        break;
 
      case GOID_NEWGRF_RESCANNED:
        /* Search the list for items that are now found and mark them as such. */
        for (auto &c : this->actives) {
          bool compatible = c->flags.Test(GRFConfigFlag::Compatible);
          if (c->status != GCS_NOT_FOUND && !compatible) continue;
 
          const GRFConfig *f = FindGRFConfig(c->ident.grfid, FGCM_EXACT, compatible ? &c->original_md5sum : &c->ident.md5sum);
          if (f == nullptr || f->flags.Test(GRFConfigFlag::Invalid)) continue;
 
          c = std::make_unique<GRFConfig>(*f);
        }
 
        this->avails.ForceRebuild();
        [[fallthrough]];
 
      case GOID_NEWGRF_CURRENT_LOADED:
        this->modified = false;
        UpdateScrollBars();
        break;
 
      case GOID_NEWGRF_LIST_EDITED:
        this->preset = -1;
        [[fallthrough]];
 
      case GOID_NEWGRF_CHANGES_MADE:
        UpdateScrollBars();
 
        /* Changes have been made to the list of active NewGRFs */
        this->modified = true;
 
        break;
    }
 
    this->BuildAvailables();
 
    this->SetWidgetDisabledState(WID_NS_APPLY_CHANGES, !((this->editable && this->modified) || _settings_client.gui.newgrf_developer_tools));
    this->SetWidgetsDisabledState(!this->editable,
      WID_NS_PRESET_LIST,
      WID_NS_TOGGLE_PALETTE
    );
    this->SetWidgetDisabledState(WID_NS_ADD, !this->editable || this->avail_sel == nullptr || this->avail_sel->flags.Test(GRFConfigFlag::Invalid));
    this->SetWidgetDisabledState(WID_NS_UPGRADE, !this->editable || this->actives.empty() || !this->CanUpgradeCurrent());
 
    bool disable_all = this->active_sel == nullptr || !this->editable;
    this->SetWidgetsDisabledState(disable_all,
      WID_NS_REMOVE,
      WID_NS_MOVE_UP,
      WID_NS_MOVE_DOWN
    );
 
    const GRFConfig *selected_config = (this->avail_sel == nullptr) ? this->active_sel : this->avail_sel;
    for (TextfileType tft = TFT_CONTENT_BEGIN; tft < TFT_CONTENT_END; tft++) {
      this->SetWidgetDisabledState(WID_NS_NEWGRF_TEXTFILE + tft, selected_config == nullptr || !selected_config->GetTextfile(tft).has_value());
    }
    this->SetWidgetDisabledState(WID_NS_OPEN_URL, selected_config == nullptr || !selected_config->GetURL().has_value());
 
    this->SetWidgetDisabledState(WID_NS_SET_PARAMETERS, !this->show_params || this->active_sel == nullptr || this->active_sel->num_valid_params == 0);
    this->SetWidgetDisabledState(WID_NS_VIEW_PARAMETERS, !this->show_params || this->active_sel == nullptr || this->active_sel->num_valid_params == 0);
    this->SetWidgetDisabledState(WID_NS_TOGGLE_PALETTE, disable_all ||
        (!(_settings_client.gui.newgrf_developer_tools || _settings_client.gui.scenario_developer) && ((selected_config->palette & GRFP_GRF_MASK) != GRFP_GRF_UNSET)));
 
    if (!disable_all) {
      /* All widgets are now enabled, so disable widgets we can't use */
      if (this->active_sel == this->actives.front().get()) this->DisableWidget(WID_NS_MOVE_UP);
      if (this->active_sel == this->actives.back().get()) this->DisableWidget(WID_NS_MOVE_DOWN);
    }
 
    this->SetWidgetDisabledState(WID_NS_PRESET_DELETE, this->preset == -1);
 
    bool has_missing = false;
    bool has_compatible = false;
    for (const auto &c : this->actives) {
      has_missing    |= c->status == GCS_NOT_FOUND;
      has_compatible |= c->flags.Test(GRFConfigFlag::Compatible);
    }
    StringID text;
    StringID tool_tip;
    if (has_missing || has_compatible) {
      text = STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON;
      tool_tip = STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_TOOLTIP;
    } else {
      text = STR_INTRO_ONLINE_CONTENT;
      tool_tip = STR_INTRO_TOOLTIP_ONLINE_CONTENT;
    }
    this->GetWidget<NWidgetCore>(WID_NS_CONTENT_DOWNLOAD)->SetStringTip(text, tool_tip);
    this->GetWidget<NWidgetCore>(WID_NS_CONTENT_DOWNLOAD2)->SetStringTip(text, tool_tip);
 
    this->SetWidgetDisabledState(WID_NS_PRESET_SAVE, has_missing);
  }
 
  EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
  {
    if (!this->editable) return ES_NOT_HANDLED;
 
    if (this->vscroll2->UpdateListPositionOnKeyPress(this->avail_pos, keycode) == ES_NOT_HANDLED) return ES_NOT_HANDLED;
 
    if (this->avail_pos >= 0) {
      this->active_sel = nullptr;
      CloseWindowByClass(WC_GRF_PARAMETERS);
      if (this->avail_sel != this->avails[this->avail_pos]) this->CloseChildWindows(WC_TEXTFILE);
      this->avail_sel = this->avails[this->avail_pos];
      this->vscroll2->ScrollTowards(this->avail_pos);
      this->InvalidateData(0);
    }
 
    return ES_HANDLED;
  }
 
  void OnEditboxChanged(WidgetID widget) override
  {
    if (!this->editable) return;
 
    if (widget == WID_NS_FILTER) {
      string_filter.SetFilterTerm(this->filter_editbox.text.GetText());
      this->avails.SetFilterState(!string_filter.IsEmpty());
      this->avails.ForceRebuild();
      this->InvalidateData(0);
    }
  }
 
  void OnDragDrop(Point pt, WidgetID widget) override
  {
    if (!this->editable) return;
 
    if (widget == WID_NS_FILE_LIST) {
      if (this->active_sel != nullptr) {
        int from_pos = this->GetCurrentActivePosition();
 
        /* Gets the drag-and-drop destination offset. Ignore the last dummy line. */
        int to_pos = std::min(this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NS_FILE_LIST, WidgetDimensions::scaled.framerect.top), this->vscroll->GetCount() - 2);
        if (to_pos != from_pos) { // Don't move NewGRF file over itself.
          if (to_pos > from_pos) ++to_pos;
 
          auto from = std::next(std::begin(this->actives), from_pos);
          auto to = std::next(std::begin(this->actives), to_pos);
          Slide(from, std::next(from), to);
 
          this->vscroll->ScrollTowards(to_pos);
          this->preset = -1;
          this->InvalidateData();
        }
      } else if (this->avail_sel != nullptr) {
        int to_pos = std::min(this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NS_FILE_LIST, WidgetDimensions::scaled.framerect.top), this->vscroll->GetCount() - 1);
        this->AddGRFToActive(to_pos);
      }
    } else if (widget == WID_NS_AVAIL_LIST && this->active_sel != nullptr) {
      /* Remove active NewGRF file by dragging it over available list. */
      Point dummy = {-1, -1};
      this->OnClick(dummy, WID_NS_REMOVE, 1);
    }
 
    ResetObjectToPlace();
 
    if (this->active_over != -1) {
      /* End of drag-and-drop, hide dragged destination highlight. */
      this->SetWidgetDirty(this->active_over == -2 ? WID_NS_AVAIL_LIST : WID_NS_FILE_LIST);
      this->active_over = -1;
    }
  }
 
  void OnMouseDrag(Point pt, WidgetID widget) override
  {
    if (!this->editable) return;
 
    if (widget == WID_NS_FILE_LIST && (this->active_sel != nullptr || this->avail_sel != nullptr)) {
      /* An NewGRF file is dragged over the active list. */
      int to_pos = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NS_FILE_LIST, WidgetDimensions::scaled.framerect.top);
      /* Skip the last dummy line if the source is from the active list. */
      to_pos = std::min(to_pos, this->vscroll->GetCount() - (this->active_sel != nullptr ? 2 : 1));
 
      if (to_pos != this->active_over) {
        this->active_over = to_pos;
        this->SetWidgetDirty(WID_NS_FILE_LIST);
      }
    } else if (widget == WID_NS_AVAIL_LIST && this->active_sel != nullptr) {
      this->active_over = -2;
      this->SetWidgetDirty(WID_NS_AVAIL_LIST);
    } else if (this->active_over != -1) {
      this->SetWidgetDirty(this->active_over == -2 ? WID_NS_AVAIL_LIST : WID_NS_FILE_LIST);
      this->active_over = -1;
    }
  }
 
private:
  static bool NameSorter(const GRFConfig * const &a, const GRFConfig * const &b)
  {
    std::string name_a = StrMakeValid(a->GetName(), {}); // Make a copy without control codes.
    std::string name_b = StrMakeValid(b->GetName(), {}); // Make a copy without control codes.
    int i = StrNaturalCompare(name_a, name_b, true); // Sort by name (natural sorting).
    if (i != 0) return i < 0;
 
    i = a->version - b->version;
    if (i != 0) return i < 0;
 
    return a->ident.md5sum < b->ident.md5sum;
  }
 
  static bool TagNameFilter(const GRFConfig * const *a, StringFilter &filter)
  {
    filter.ResetState();
    filter.AddLine((*a)->GetName());
    filter.AddLine((*a)->filename);
    if (auto desc = (*a)->GetDescription(); desc.has_value()) filter.AddLine(*desc);
    return filter.GetState();;
  }
 
  void BuildAvailables()
  {
    if (!this->avails.NeedRebuild()) return;
 
    this->avails.clear();
 
    for (const auto &c : _all_grfs) {
      if (std::ranges::any_of(this->actives, [&c](const auto &gc) { return gc->ident.HasGrfIdentifier(c->ident.grfid, &c->ident.md5sum); })) continue;
 
      if (_settings_client.gui.newgrf_show_old_versions) {
        this->avails.push_back(c.get());
      } else {
        const GRFConfig *best = FindGRFConfig(c->ident.grfid, c->flags.Test(GRFConfigFlag::Invalid) ? FGCM_NEWEST : FGCM_NEWEST_VALID);
        /* Never triggers; FindGRFConfig returns either c, or a newer version of c. */
        assert(best != nullptr);
 
        /*
         * If the best version is 0, then all NewGRF with this GRF ID
         * have version 0, so for backward compatibility reasons we
         * want to show them all.
         * If we are the best version, then we definitely want to
         * show that NewGRF!.
         */
        if (best->version == 0 || best->ident.HasGrfIdentifier(c->ident.grfid, &c->ident.md5sum)) {
          this->avails.push_back(c.get());
        }
      }
    }
 
    this->avails.Filter(this->string_filter);
    this->avails.RebuildDone();
    this->avails.Sort();
 
    if (this->avail_sel != nullptr) {
      this->avail_pos = find_index(this->avails, this->avail_sel);
      if (this->avail_pos == -1) {
        this->avail_sel = nullptr;
      }
    }
 
    this->vscroll2->SetCount(this->avails.size()); // Update the scrollbar
  }
 
  bool AddGRFToActive(int ins_pos = -1)
  {
    if (this->avail_sel == nullptr || !this->editable || this->avail_sel->flags.Test(GRFConfigFlag::Invalid)) return false;
 
    this->CloseChildWindows(WC_TEXTFILE);
 
    /* Get number of non-static NewGRFs. */
    size_t count = std::ranges::count_if(this->actives, [](const auto &gc) { return !gc->flags.Test(GRFConfigFlag::Static); });
    if (count >= NETWORK_MAX_GRF_COUNT) {
      ShowErrorMessage(GetEncodedString(STR_NEWGRF_TOO_MANY_NEWGRFS), {}, WL_INFO);
      return false;
    }
 
    /* Check for duplicate GRF ID. */
    if (std::ranges::any_of(this->actives, [&grfid = this->avail_sel->ident.grfid](const auto &gc)  { return gc->ident.grfid == grfid; })) {
      ShowErrorMessage(GetEncodedString(STR_NEWGRF_DUPLICATE_GRFID), {}, WL_INFO);
      return false;
    }
 
    auto entry = (ins_pos >= 0 && static_cast<size_t>(ins_pos) < std::size(this->actives))
      ? std::next(std::begin(this->actives), ins_pos)
      : std::end(this->actives);
 
    /* Copy GRF details from scanned list. */
    entry = this->actives.insert(entry, std::make_unique<GRFConfig>(*this->avail_sel));
    (*entry)->SetParameterDefaults();
 
    /* Select next (or previous, if last one) item in the list. */
    int new_pos = this->avail_pos + 1;
    if (new_pos >= (int)this->avails.size()) new_pos = this->avail_pos - 1;
    this->avail_pos = new_pos;
    if (new_pos >= 0) this->avail_sel = this->avails[new_pos];
 
    this->avails.ForceRebuild();
    this->InvalidateData(GOID_NEWGRF_LIST_EDITED);
    return true;
  }
};
 
void ShowMissingContentWindow(const GRFConfigList &list)
{
  /* Only show the things in the current list, or everything when nothing's selected */
  ContentVector cv;
  for (const auto &c : list) {
    if (c->status != GCS_NOT_FOUND && !c->flags.Test(GRFConfigFlag::Compatible)) continue;
 
    auto ci = std::make_unique<ContentInfo>();
    ci->type = CONTENT_TYPE_NEWGRF;
    ci->state = ContentInfo::State::DoesNotExist;
    ci->name = c->GetName();
    ci->unique_id = std::byteswap(c->ident.grfid);
    ci->md5sum = c->flags.Test(GRFConfigFlag::Compatible) ? c->original_md5sum : c->ident.md5sum;
    cv.push_back(std::move(ci));
  }
  ShowNetworkContentListWindow(cv.empty() ? nullptr : &cv, CONTENT_TYPE_NEWGRF);
}
 
Listing NewGRFWindow::last_sorting     = {false, 0};
Filtering NewGRFWindow::last_filtering = {false, 0};
 
const std::initializer_list<NewGRFWindow::GUIGRFConfigList::SortFunction * const> NewGRFWindow::sorter_funcs = {
  &NameSorter,
};
 
const std::initializer_list<NewGRFWindow::GUIGRFConfigList::FilterFunction * const> NewGRFWindow::filter_funcs = {
  &TagNameFilter,
};
 
class NWidgetNewGRFDisplay : public NWidgetBase {
public:
  static const uint MAX_EXTRA_INFO_WIDTH;    
  static const uint MIN_EXTRA_FOR_3_COLUMNS; 
 
  std::unique_ptr<NWidgetBase> avs{}; 
  std::unique_ptr<NWidgetBase> acs{}; 
  std::unique_ptr<NWidgetBase> inf{}; 
  bool editable = true; 
 
  NWidgetNewGRFDisplay(std::unique_ptr<NWidgetBase> &&avs, std::unique_ptr<NWidgetBase> &&acs, std::unique_ptr<NWidgetBase> &&inf) : NWidgetBase(NWID_CUSTOM)
    , avs(std::move(avs))
    , acs(std::move(acs))
    , inf(std::move(inf))
  {
  }
 
  void SetupSmallestSize(Window *w) override
  {
    /* Copy state flag from the window. */
    assert(dynamic_cast<NewGRFWindow *>(w) != nullptr);
    NewGRFWindow *ngw = (NewGRFWindow *)w;
    this->editable = ngw->editable;
 
    this->avs->SetupSmallestSize(w);
    this->acs->SetupSmallestSize(w);
    this->inf->SetupSmallestSize(w);
 
    uint min_avs_width = this->avs->smallest_x + this->avs->padding.Horizontal();
    uint min_acs_width = this->acs->smallest_x + this->acs->padding.Horizontal();
    uint min_inf_width = this->inf->smallest_x + this->inf->padding.Horizontal();
 
    uint min_avs_height = this->avs->smallest_y + this->avs->padding.Vertical();
    uint min_acs_height = this->acs->smallest_y + this->acs->padding.Vertical();
    uint min_inf_height = this->inf->smallest_y + this->inf->padding.Vertical();
 
    /* Smallest window is in two column mode. */
    this->smallest_x = std::max(min_avs_width, min_acs_width) + WidgetDimensions::scaled.hsep_wide + min_inf_width;
    this->smallest_y = std::max(min_inf_height, min_acs_height + WidgetDimensions::scaled.vsep_wide + min_avs_height);
 
    /* Filling. */
    this->fill_x = std::lcm(this->avs->fill_x, this->acs->fill_x);
    if (this->inf->fill_x > 0 && (this->fill_x == 0 || this->fill_x > this->inf->fill_x)) this->fill_x = this->inf->fill_x;
 
    this->fill_y = this->avs->fill_y;
    if (this->acs->fill_y > 0 && (this->fill_y == 0 || this->fill_y > this->acs->fill_y)) this->fill_y = this->acs->fill_y;
    this->fill_y = std::lcm(this->fill_y, this->inf->fill_y);
 
    /* Resizing. */
    this->resize_x = std::lcm(this->avs->resize_x, this->acs->resize_x);
    if (this->inf->resize_x > 0 && (this->resize_x == 0 || this->resize_x > this->inf->resize_x)) this->resize_x = this->inf->resize_x;
 
    this->resize_y = this->avs->resize_y;
    if (this->acs->resize_y > 0 && (this->resize_y == 0 || this->resize_y > this->acs->resize_y)) this->resize_y = this->acs->resize_y;
    this->resize_y = std::lcm(this->resize_y, this->inf->resize_y);
 
    /* Make sure the height suits the 3 column (resp. not-editable) format; the 2 column format can easily fill space between the lists */
    this->smallest_y = ComputeMaxSize(min_acs_height, this->smallest_y + this->resize_y - 1, this->resize_y);
  }
 
  void AssignSizePosition(SizingType sizing, int x, int y, uint given_width, uint given_height, bool rtl) override
  {
    this->StoreSizePosition(sizing, x, y, given_width, given_height);
 
    uint min_avs_width = this->avs->smallest_x + this->avs->padding.Horizontal();
    uint min_acs_width = this->acs->smallest_x + this->acs->padding.Horizontal();
    uint min_inf_width = this->inf->smallest_x + this->inf->padding.Horizontal();
 
    uint min_list_width = std::max(min_avs_width, min_acs_width); // Smallest width of the lists such that they have equal width (incl padding).
    uint avs_extra_width = min_list_width - min_avs_width;   // Additional width needed for avs to reach min_list_width.
    uint acs_extra_width = min_list_width - min_acs_width;   // Additional width needed for acs to reach min_list_width.
 
    /* Use 2 or 3 columns? */
    uint min_three_columns = min_avs_width + min_acs_width + min_inf_width + 2 * WidgetDimensions::scaled.hsep_wide;
    uint min_two_columns   = min_list_width + min_inf_width + WidgetDimensions::scaled.hsep_wide;
    bool use_three_columns = this->editable && (min_three_columns + ScaleGUITrad(MIN_EXTRA_FOR_3_COLUMNS) <= given_width);
 
    /* Info panel is a separate column in both modes. Compute its width first. */
    uint extra_width, inf_width;
    if (use_three_columns) {
      extra_width = given_width - min_three_columns;
      inf_width = std::min<uint>(ScaleGUITrad(MAX_EXTRA_INFO_WIDTH), extra_width / 2);
    } else {
      extra_width = given_width - min_two_columns;
      inf_width = std::min<uint>(ScaleGUITrad(MAX_EXTRA_INFO_WIDTH), extra_width / 2);
    }
    inf_width = ComputeMaxSize(this->inf->smallest_x, this->inf->smallest_x + inf_width, this->inf->GetHorizontalStepSize(sizing));
    extra_width -= inf_width - this->inf->smallest_x;
 
    uint inf_height = ComputeMaxSize(this->inf->smallest_y, given_height, this->inf->GetVerticalStepSize(sizing));
 
    if (use_three_columns) {
      /* Three column display, first make both lists equally wide, then divide whatever is left between both lists.
       * Only keep track of what avs gets, all other space goes to acs. */
      uint avs_width = std::min(avs_extra_width, extra_width);
      extra_width -= avs_width;
      extra_width -= std::min(acs_extra_width, extra_width);
      avs_width += extra_width / 2;
 
      avs_width = ComputeMaxSize(this->avs->smallest_x, this->avs->smallest_x + avs_width, this->avs->GetHorizontalStepSize(sizing));
 
      uint acs_width = given_width - // Remaining space, including horizontal padding.
          inf_width - this->inf->padding.Horizontal() -
          avs_width - this->avs->padding.Horizontal() - 2 * WidgetDimensions::scaled.hsep_wide;
      acs_width = ComputeMaxSize(min_acs_width, acs_width, this->acs->GetHorizontalStepSize(sizing)) -
          this->acs->padding.Horizontal();
 
      /* Never use fill_y on these; the minimal size is chosen, so that the 3 column view looks nice */
      uint avs_height = ComputeMaxSize(this->avs->smallest_y, given_height, this->avs->resize_y);
      uint acs_height = ComputeMaxSize(this->acs->smallest_y, given_height, this->acs->resize_y);
 
      /* Assign size and position to the children. */
      if (rtl) {
        x += this->inf->padding.left;
        this->inf->AssignSizePosition(sizing, x, y + this->inf->padding.top, inf_width, inf_height, rtl);
        x += inf_width + this->inf->padding.right + WidgetDimensions::scaled.hsep_wide;
      } else {
        x += this->avs->padding.left;
        this->avs->AssignSizePosition(sizing, x, y + this->avs->padding.top, avs_width, avs_height, rtl);
        x += avs_width + this->avs->padding.right + WidgetDimensions::scaled.hsep_wide;
      }
 
      x += this->acs->padding.left;
      this->acs->AssignSizePosition(sizing, x, y + this->acs->padding.top, acs_width, acs_height, rtl);
      x += acs_width + this->acs->padding.right + WidgetDimensions::scaled.hsep_wide;
 
      if (rtl) {
        x += this->avs->padding.left;
        this->avs->AssignSizePosition(sizing, x, y + this->avs->padding.top, avs_width, avs_height, rtl);
      } else {
        x += this->inf->padding.left;
        this->inf->AssignSizePosition(sizing, x, y + this->inf->padding.top, inf_width, inf_height, rtl);
      }
    } else {
      /* Two columns, all space in extra_width goes to both lists. Since the lists are underneath each other,
       * the column is min_list_width wide at least. */
      uint avs_width = ComputeMaxSize(this->avs->smallest_x, this->avs->smallest_x + avs_extra_width + extra_width,
          this->avs->GetHorizontalStepSize(sizing));
      uint acs_width = ComputeMaxSize(this->acs->smallest_x, this->acs->smallest_x + acs_extra_width + extra_width,
          this->acs->GetHorizontalStepSize(sizing));
 
      uint min_avs_height = (!this->editable) ? 0 : this->avs->smallest_y + this->avs->padding.Vertical() + WidgetDimensions::scaled.vsep_wide;
      uint min_acs_height = this->acs->smallest_y + this->acs->padding.Vertical();
      uint extra_height = given_height - min_acs_height - min_avs_height;
 
      /* Never use fill_y on these; instead use WidgetDimensions::scaled.vsep_wide as filler */
      uint avs_height = ComputeMaxSize(this->avs->smallest_y, this->avs->smallest_y + extra_height / 2, this->avs->resize_y);
      if (this->editable) extra_height -= avs_height - this->avs->smallest_y;
      uint acs_height = ComputeMaxSize(this->acs->smallest_y, this->acs->smallest_y + extra_height, this->acs->resize_y);
 
      /* Assign size and position to the children. */
      if (rtl) {
        x += this->inf->padding.left;
        this->inf->AssignSizePosition(sizing, x, y + this->inf->padding.top, inf_width, inf_height, rtl);
        x += inf_width + this->inf->padding.right + WidgetDimensions::scaled.hsep_wide;
 
        this->acs->AssignSizePosition(sizing, x + this->acs->padding.left, y + this->acs->padding.top, acs_width, acs_height, rtl);
        if (this->editable) {
          this->avs->AssignSizePosition(sizing, x + this->avs->padding.left, y + given_height - avs_height - this->avs->padding.bottom, avs_width, avs_height, rtl);
        } else {
          this->avs->AssignSizePosition(sizing, 0, 0, this->avs->smallest_x, this->avs->smallest_y, rtl);
        }
      } else {
        this->acs->AssignSizePosition(sizing, x + this->acs->padding.left, y + this->acs->padding.top, acs_width, acs_height, rtl);
        if (this->editable) {
          this->avs->AssignSizePosition(sizing, x + this->avs->padding.left, y + given_height - avs_height - this->avs->padding.bottom, avs_width, avs_height, rtl);
        } else {
          this->avs->AssignSizePosition(sizing, 0, 0, this->avs->smallest_x, this->avs->smallest_y, rtl);
        }
        uint dx = this->acs->current_x + this->acs->padding.Horizontal();
        if (this->editable) {
          dx = std::max(dx, this->avs->current_x + this->avs->padding.Horizontal());
        }
        x += dx + WidgetDimensions::scaled.hsep_wide + this->inf->padding.left;
        this->inf->AssignSizePosition(sizing, x, y + this->inf->padding.top, inf_width, inf_height, rtl);
      }
    }
  }
 
  void FillWidgetLookup(WidgetLookup &widget_lookup) override
  {
    this->NWidgetBase::FillWidgetLookup(widget_lookup);
    this->avs->FillWidgetLookup(widget_lookup);
    this->acs->FillWidgetLookup(widget_lookup);
    this->inf->FillWidgetLookup(widget_lookup);
  }
 
  NWidgetCore *GetWidgetFromPos(int x, int y) override
  {
    if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
 
    NWidgetCore *nw = (this->editable) ? this->avs->GetWidgetFromPos(x, y) : nullptr;
    if (nw == nullptr) nw = this->acs->GetWidgetFromPos(x, y);
    if (nw == nullptr) nw = this->inf->GetWidgetFromPos(x, y);
    return nw;
  }
 
  void Draw(const Window *w) override
  {
    if (this->editable) this->avs->Draw(w);
    this->acs->Draw(w);
    this->inf->Draw(w);
  }
};
 
const uint NWidgetNewGRFDisplay::MAX_EXTRA_INFO_WIDTH    = 150;
const uint NWidgetNewGRFDisplay::MIN_EXTRA_FOR_3_COLUMNS = 50;
 
static constexpr NWidgetPart _nested_newgrf_actives_widgets[] = {
  NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0),
    /* Left side, presets. */
    NWidget(NWID_VERTICAL),
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_TEXT, INVALID_COLOUR), SetStringTip(STR_NEWGRF_SETTINGS_SELECT_PRESET),
            SetPadding(0, WidgetDimensions::unscaled.hsep_wide, 0, 0),
        NWidget(WWT_DROPDOWN, COLOUR_YELLOW, WID_NS_PRESET_LIST), SetFill(1, 0), SetResize(1, 0),
            SetToolTip(STR_NEWGRF_SETTINGS_PRESET_LIST_TOOLTIP),
      EndContainer(),
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_PRESET_SAVE), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_NEWGRF_SETTINGS_PRESET_SAVE, STR_NEWGRF_SETTINGS_PRESET_SAVE_TOOLTIP),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_PRESET_DELETE), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_NEWGRF_SETTINGS_PRESET_DELETE, STR_NEWGRF_SETTINGS_PRESET_DELETE_TOOLTIP),
      EndContainer(),
    EndContainer(),
 
    NWidget(WWT_FRAME, COLOUR_MAUVE), SetStringTip(STR_NEWGRF_SETTINGS_ACTIVE_LIST), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0),
      /* Left side, active grfs. */
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PANEL, COLOUR_MAUVE),
          NWidget(WWT_INSET, COLOUR_MAUVE, WID_NS_FILE_LIST), SetMinimalSize(100, 1), SetPadding(2),
              SetFill(1, 1), SetResize(1, 1), SetScrollbar(WID_NS_SCROLLBAR), SetToolTip(STR_NEWGRF_SETTINGS_FILE_TOOLTIP),
          EndContainer(),
        EndContainer(),
        NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, WID_NS_SCROLLBAR),
      EndContainer(),
 
      /* Buttons. */
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NS_SHOW_REMOVE),
        NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_REMOVE), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_REMOVE, STR_NEWGRF_SETTINGS_REMOVE_TOOLTIP),
          NWidget(NWID_VERTICAL),
            NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_MOVE_UP), SetFill(1, 0), SetResize(1, 0),
                SetStringTip(STR_NEWGRF_SETTINGS_MOVEUP, STR_NEWGRF_SETTINGS_MOVEUP_TOOLTIP),
            NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_MOVE_DOWN), SetFill(1, 0), SetResize(1, 0),
                SetStringTip(STR_NEWGRF_SETTINGS_MOVEDOWN, STR_NEWGRF_SETTINGS_MOVEDOWN_TOOLTIP),
          EndContainer(),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_UPGRADE), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_UPGRADE, STR_NEWGRF_SETTINGS_UPGRADE_TOOLTIP),
        EndContainer(),
 
        NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_RESCAN_FILES2), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_CONTENT_DOWNLOAD2), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static constexpr NWidgetPart _nested_newgrf_availables_widgets[] = {
  NWidget(WWT_FRAME, COLOUR_MAUVE), SetStringTip(STR_NEWGRF_SETTINGS_INACTIVE_LIST), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0),
    /* Left side, available grfs, filter edit box. */
    NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
      NWidget(WWT_TEXT, INVALID_COLOUR), SetFill(0, 1), SetStringTip(STR_NEWGRF_FILTER_TITLE),
      NWidget(WWT_EDITBOX, COLOUR_MAUVE, WID_NS_FILTER), SetFill(1, 0), SetResize(1, 0),
          SetStringTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
    EndContainer(),
 
    /* Left side, available grfs. */
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_PANEL, COLOUR_MAUVE),
        NWidget(WWT_INSET, COLOUR_MAUVE, WID_NS_AVAIL_LIST), SetMinimalSize(100, 1), SetPadding(2),
            SetFill(1, 1), SetResize(1, 1), SetScrollbar(WID_NS_SCROLL2BAR),
        EndContainer(),
      EndContainer(),
      NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, WID_NS_SCROLL2BAR),
    EndContainer(),
 
    /* Left side, available grfs, buttons. */
    NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_ADD), SetFill(1, 0), SetResize(1, 0),
          SetStringTip(STR_NEWGRF_SETTINGS_ADD, STR_NEWGRF_SETTINGS_ADD_FILE_TOOLTIP),
      NWidget(NWID_VERTICAL),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_RESCAN_FILES), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_CONTENT_DOWNLOAD), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static constexpr NWidgetPart _nested_newgrf_infopanel_widgets[] = {
  NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0),
    /* Right side, info panel. */
    NWidget(WWT_PANEL, COLOUR_MAUVE),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_NS_NEWGRF_INFO_TITLE), SetFill(1, 0), SetResize(1, 0),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_NS_NEWGRF_INFO), SetFill(1, 1), SetResize(1, 1), SetMinimalSize(150, 100),
    EndContainer(),
 
    /* Right side, info buttons. */
    NWidget(NWID_VERTICAL),
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_OPEN_URL), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_CONTENT_OPEN_URL, STR_CONTENT_OPEN_URL_TOOLTIP),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_NEWGRF_TEXTFILE + TFT_README), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_TEXTFILE_VIEW_README, STR_TEXTFILE_VIEW_README_TOOLTIP),
      EndContainer(),
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_NEWGRF_TEXTFILE + TFT_CHANGELOG), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_TEXTFILE_VIEW_CHANGELOG, STR_TEXTFILE_VIEW_CHANGELOG_TOOLTIP),
        NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_NEWGRF_TEXTFILE + TFT_LICENSE), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_TEXTFILE_VIEW_LICENCE, STR_TEXTFILE_VIEW_LICENCE_TOOLTIP),
      EndContainer(),
    EndContainer(),
 
    /* Right side, config buttons. */
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NS_SHOW_EDIT),
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
        NWidget(NWID_VERTICAL),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_SET_PARAMETERS), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_SET_PARAMETERS),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_TOGGLE_PALETTE), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_TOGGLE_PALETTE, STR_NEWGRF_SETTINGS_TOGGLE_PALETTE_TOOLTIP),
        EndContainer(),
        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NS_SHOW_APPLY),
          NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_APPLY_CHANGES), SetFill(1, 0), SetResize(1, 0),
              SetStringTip(STR_NEWGRF_SETTINGS_APPLY_CHANGES),
        EndContainer(),
      EndContainer(),
      NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_VIEW_PARAMETERS), SetFill(1, 0), SetResize(1, 0),
          SetStringTip(STR_NEWGRF_SETTINGS_SHOW_PARAMETERS),
    EndContainer(),
  EndContainer(),
};
 
std::unique_ptr<NWidgetBase> NewGRFDisplay()
{
  std::unique_ptr<NWidgetBase> avs = MakeNWidgets(_nested_newgrf_availables_widgets, nullptr);
  std::unique_ptr<NWidgetBase> acs = MakeNWidgets(_nested_newgrf_actives_widgets, nullptr);
  std::unique_ptr<NWidgetBase> inf = MakeNWidgets(_nested_newgrf_infopanel_widgets, nullptr);
 
  return std::make_unique<NWidgetNewGRFDisplay>(std::move(avs), std::move(acs), std::move(inf));
}
 
/* Widget definition of the manage newgrfs window */
static constexpr NWidgetPart _nested_newgrf_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_MAUVE),
    NWidget(WWT_CAPTION, COLOUR_MAUVE), SetStringTip(STR_NEWGRF_SETTINGS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_DEFSIZEBOX, COLOUR_MAUVE),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_MAUVE),
    NWidgetFunction(NewGRFDisplay), SetPadding(WidgetDimensions::unscaled.sparse_resize),
    /* Resize button. */
    NWidget(NWID_HORIZONTAL),
      NWidget(NWID_SPACER), SetFill(1, 0), SetResize(1, 0),
      NWidget(WWT_RESIZEBOX, COLOUR_MAUVE), SetResizeWidgetTypeTip(RWV_HIDE_BEVEL, STR_TOOLTIP_RESIZE),
    EndContainer(),
  EndContainer(),
};
 
/* Window definition of the manage newgrfs window */
static WindowDesc _newgrf_desc(
  WDP_CENTER, "settings_newgrf", 300, 263,
  WC_GAME_OPTIONS, WC_NONE,
  {},
  _nested_newgrf_widgets
);
 
static void NewGRFConfirmationCallback(Window *w, bool confirmed)
{
  if (confirmed) {
    CloseWindowByClass(WC_GRF_PARAMETERS);
    w->CloseChildWindows(WC_TEXTFILE);
    NewGRFWindow *nw = dynamic_cast<NewGRFWindow*>(w);
    assert(nw != nullptr);
 
    _gamelog.StartAction(GLAT_GRF);
    _gamelog.GRFUpdate(_grfconfig, nw->actives); // log GRF changes
    CopyGRFConfigList(nw->orig_list, nw->actives, false);
    ReloadNewGRFData();
    _gamelog.StopAction();
 
    /* Show new, updated list */
    int pos = nw->GetCurrentActivePosition();
 
    CopyGRFConfigList(nw->actives, nw->orig_list, false);
 
    if (nw->active_sel != nullptr) {
      /* Set current selection from position */
      if (static_cast<size_t>(pos) >= nw->actives.size()) {
        nw->active_sel = nw->actives.back().get();
      } else {
        auto it = std::next(std::begin(nw->actives), pos);
        nw->active_sel = it->get();
      }
    }
    nw->avails.ForceRebuild();
    nw->modified = false;
 
    w->InvalidateData();
 
    ReInitAllWindows(false);
    CloseWindowByClass(WC_BUILD_OBJECT);
  }
}
 
 
 
void ShowNewGRFSettings(bool editable, bool show_params, bool exec_changes, GRFConfigList &config)
{
  CloseWindowByClass(WC_GAME_OPTIONS);
  new NewGRFWindow(_newgrf_desc, editable, show_params, exec_changes, config);
}
 
static constexpr NWidgetPart _nested_save_preset_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY), SetStringTip(STR_SAVE_PRESET_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY),
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_INSET, COLOUR_GREY, WID_SVP_PRESET_LIST), SetPadding(2, 1, 2, 2),
          SetToolTip(STR_SAVE_PRESET_LIST_TOOLTIP), SetResize(1, 10), SetScrollbar(WID_SVP_SCROLLBAR), EndContainer(),
      NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_SVP_SCROLLBAR),
    EndContainer(),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY),
    NWidget(WWT_EDITBOX, COLOUR_GREY, WID_SVP_EDITBOX), SetPadding(2, 2, 2, 2), SetFill(1, 0), SetResize(1, 0),
        SetStringTip(STR_SAVE_PRESET_TITLE, STR_SAVE_PRESET_EDITBOX_TOOLTIP),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SVP_SAVE), SetStringTip(STR_SAVE_PRESET_SAVE, STR_SAVE_PRESET_SAVE_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
static WindowDesc _save_preset_desc(
  WDP_CENTER, "save_preset", 140, 110,
  WC_SAVE_PRESET, WC_GAME_OPTIONS,
  WindowDefaultFlag::Modal,
  _nested_save_preset_widgets
);
 
struct SavePresetWindow : public Window {
  QueryString presetname_editbox; 
  StringList presets{}; 
  Scrollbar *vscroll = nullptr; 
  int selected = -1; 
 
  SavePresetWindow(std::string_view initial_text) : Window(_save_preset_desc), presetname_editbox(32)
  {
    this->presets = GetGRFPresetList();
    if (!initial_text.empty()) {
      for (uint i = 0; i < this->presets.size(); i++) {
        if (this->presets[i] == initial_text) {
          this->selected = i;
          break;
        }
      }
    }
 
    this->querystrings[WID_SVP_EDITBOX] = &this->presetname_editbox;
    this->presetname_editbox.ok_button = WID_SVP_SAVE;
 
    this->CreateNestedTree();
    this->vscroll = this->GetScrollbar(WID_SVP_SCROLLBAR);
    this->FinishInitNested(0);
 
    this->vscroll->SetCount(this->presets.size());
    this->SetFocusedWidget(WID_SVP_EDITBOX);
    this->presetname_editbox.text.Assign(initial_text);
  }
 
  ~SavePresetWindow()
  {
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_SVP_PRESET_LIST: {
        fill.height = resize.height = GetCharacterHeight(FS_NORMAL);
        size.height = 0;
        for (uint i = 0; i < this->presets.size(); i++) {
          Dimension d = GetStringBoundingBox(this->presets[i]);
          size.width = std::max(size.width, d.width + padding.width);
        }
        size.height = ClampU((uint)this->presets.size(), 5, 20) * resize.height + padding.height;
        break;
      }
    }
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_SVP_PRESET_LIST: {
        const Rect br = r.Shrink(WidgetDimensions::scaled.bevel);
        GfxFillRect(br, PC_BLACK);
 
        uint step_height = this->GetWidget<NWidgetBase>(WID_SVP_PRESET_LIST)->resize_y;
        int offset_y = (step_height - GetCharacterHeight(FS_NORMAL)) / 2;
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
        auto [first, last] = this->vscroll->GetVisibleRangeIterators(this->presets);
        for (auto it = first; it != last; ++it) {
          int row = static_cast<int>(std::distance(std::begin(this->presets), it));
          if (row == this->selected) GfxFillRect(br.left, tr.top, br.right, tr.top + step_height - 1, PC_DARK_BLUE);
 
          DrawString(tr.left, tr.right, tr.top + offset_y, *it, (row == this->selected) ? TC_WHITE : TC_SILVER);
          tr.top += step_height;
        }
        break;
      }
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_SVP_PRESET_LIST: {
        auto it = this->vscroll->GetScrolledItemFromWidget(this->presets, pt.y, this, WID_SVP_PRESET_LIST);
        if (it != this->presets.end()) {
          this->selected = it - this->presets.begin();
          this->presetname_editbox.text.Assign(*it);
          this->SetWidgetDirty(WID_SVP_PRESET_LIST);
          this->SetWidgetDirty(WID_SVP_EDITBOX);
        }
        break;
      }
 
      case WID_SVP_SAVE: {
        Window *w = FindWindowById(WC_GAME_OPTIONS, WN_GAME_OPTIONS_NEWGRF_STATE);
        if (w != nullptr) {
          auto text = this->presetname_editbox.text.GetText();
          if (!text.empty()) w->OnQueryTextFinished(std::string{text});
        }
        this->Close();
        break;
      }
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_SVP_PRESET_LIST, WidgetDimensions::scaled.framerect.Vertical());
  }
};
 
static void ShowSavePresetWindow(std::string_view initial_text)
{
  CloseWindowByClass(WC_SAVE_PRESET);
  new SavePresetWindow(initial_text);
}
 
static constexpr NWidgetPart _nested_scan_progress_widgets[] = {
  NWidget(WWT_CAPTION, COLOUR_GREY), SetStringTip(STR_NEWGRF_SCAN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
  NWidget(WWT_PANEL, COLOUR_GREY),
    NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0), SetPadding(WidgetDimensions::unscaled.modalpopup),
      NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_NEWGRF_SCAN_MESSAGE), SetFill(1, 0),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_SP_PROGRESS_BAR), SetFill(1, 0),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_SP_PROGRESS_TEXT), SetFill(1, 0), SetMinimalSize(400, 0),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _scan_progress_desc(
  WDP_CENTER, {}, 0, 0,
  WC_MODAL_PROGRESS, WC_NONE,
  {},
  _nested_scan_progress_widgets
);
 
struct ScanProgressWindow : public Window {
  std::string last_name{}; 
  int scanned = 0; 
 
  ScanProgressWindow() : Window(_scan_progress_desc)
  {
    this->InitNested(1);
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_SP_PROGRESS_BAR:
        size = GetStringBoundingBox(GetString(STR_GENERATION_PROGRESS, GetParamMaxValue(100)));
        /* We need some spacing for the 'border' */
        size.height += WidgetDimensions::scaled.frametext.Horizontal();
        size.width  += WidgetDimensions::scaled.frametext.Vertical();
        break;
 
      case WID_SP_PROGRESS_TEXT: {
        uint64_t max_digits = GetParamMaxDigits(4);
        /* We really don't know the width. We could determine it by scanning the NewGRFs,
         * but this is the status window for scanning them... */
        size.width = std::max<uint>(size.width, GetStringBoundingBox(GetString(STR_NEWGRF_SCAN_STATUS, max_digits, max_digits)).width + padding.width);
        size.height = GetCharacterHeight(FS_NORMAL) * 2 + WidgetDimensions::scaled.vsep_normal;
        break;
      }
    }
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_SP_PROGRESS_BAR: {
        /* Draw the % complete with a bar and a text */
        DrawFrameRect(r, COLOUR_GREY, {FrameFlag::BorderOnly, FrameFlag::Lowered});
        Rect ir = r.Shrink(WidgetDimensions::scaled.bevel);
        uint percent = scanned * 100 / std::max(1U, _settings_client.gui.last_newgrf_count);
        DrawFrameRect(ir.WithWidth(ir.Width() * percent / 100, _current_text_dir == TD_RTL), COLOUR_MAUVE, {});
        DrawString(ir.left, ir.right, CentreBounds(ir.top, ir.bottom, GetCharacterHeight(FS_NORMAL)), GetString(STR_GENERATION_PROGRESS, percent), TC_FROMSTRING, SA_HOR_CENTER);
        break;
      }
 
      case WID_SP_PROGRESS_TEXT:
        DrawString(r.left, r.right, r.top, GetString(STR_NEWGRF_SCAN_STATUS, this->scanned, _settings_client.gui.last_newgrf_count), TC_FROMSTRING, SA_HOR_CENTER);
 
        DrawString(r.left, r.right, r.top + GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal, this->last_name, TC_BLACK, SA_HOR_CENTER);
        break;
    }
  }
 
  void UpdateNewGRFScanStatus(uint num, std::string &&name)
  {
    this->last_name = std::move(name);
    this->scanned = num;
    if (num > _settings_client.gui.last_newgrf_count) _settings_client.gui.last_newgrf_count = num;
 
    this->SetDirty();
  }
};
 
void UpdateNewGRFScanStatus(uint num, std::string &&name)
{
  ScanProgressWindow *w  = dynamic_cast<ScanProgressWindow *>(FindWindowByClass(WC_MODAL_PROGRESS));
  if (w == nullptr) w = new ScanProgressWindow();
  w->UpdateNewGRFScanStatus(num, std::move(name));
}