network_content_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 "../strings_func.h"
#include "../gfx_func.h"
#include "../window_func.h"
#include "../error.h"
#include "../ai/ai.hpp"
#include "../game/game.hpp"
#include "../base_media_base.h"
#include "../base_media_graphics.h"
#include "../base_media_music.h"
#include "../base_media_sounds.h"
#include "../openttd.h"
#include "../sortlist_type.h"
#include "../stringfilter_type.h"
#include "../querystring_gui.h"
#include "../core/geometry_func.hpp"
#include "../textfile_gui.h"
#include "../fios.h"
#include "network_content_gui.h"
 
 
#include "table/strings.h"
#include "../table/sprites.h"
 
#include "../safeguards.h"
 
 
static bool _accepted_external_search = false;
 
 
struct ContentTextfileWindow : public TextfileWindow {
  const ContentInfo *ci = nullptr; 
 
  ContentTextfileWindow(Window *parent, TextfileType file_type, const ContentInfo *ci) : TextfileWindow(parent, file_type), ci(ci)
  {
    this->ConstructWindow();
 
    auto textfile = this->ci->GetTextfile(file_type);
    this->LoadTextfile(textfile.value(), GetContentInfoSubDir(this->ci->type));
  }
 
  StringID GetTypeString() const
  {
    switch (this->ci->type) {
      case CONTENT_TYPE_NEWGRF:        return STR_CONTENT_TYPE_NEWGRF;
      case CONTENT_TYPE_BASE_GRAPHICS: return STR_CONTENT_TYPE_BASE_GRAPHICS;
      case CONTENT_TYPE_BASE_SOUNDS:   return STR_CONTENT_TYPE_BASE_SOUNDS;
      case CONTENT_TYPE_BASE_MUSIC:    return STR_CONTENT_TYPE_BASE_MUSIC;
      case CONTENT_TYPE_AI:            return STR_CONTENT_TYPE_AI;
      case CONTENT_TYPE_AI_LIBRARY:    return STR_CONTENT_TYPE_AI_LIBRARY;
      case CONTENT_TYPE_GAME:          return STR_CONTENT_TYPE_GAME_SCRIPT;
      case CONTENT_TYPE_GAME_LIBRARY:  return STR_CONTENT_TYPE_GS_LIBRARY;
      case CONTENT_TYPE_SCENARIO:      return STR_CONTENT_TYPE_SCENARIO;
      case CONTENT_TYPE_HEIGHTMAP:     return STR_CONTENT_TYPE_HEIGHTMAP;
      default: NOT_REACHED();
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_TF_CAPTION) {
      return GetString(stringid, this->GetTypeString(), this->ci->name);
    }
 
    return this->Window::GetWidgetString(widget, stringid);
  }
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override {…}
};
struct ContentTextfileWindow : public TextfileWindow {…};
 
static void ShowContentTextfileWindow(Window *parent, TextfileType file_type, const ContentInfo *ci)
{
  parent->CloseChildWindowById(WC_TEXTFILE, file_type);
  new ContentTextfileWindow(parent, file_type, ci);
}
 
static constexpr NWidgetPart _nested_network_content_download_status_window_widgets[] = {
  NWidget(WWT_CAPTION, COLOUR_GREY), SetStringTip(STR_CONTENT_DOWNLOAD_TITLE, 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_EMPTY, INVALID_COLOUR, WID_NCDS_PROGRESS_BAR), SetFill(1, 0),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_NCDS_PROGRESS_TEXT), SetFill(1, 0), SetMinimalSize(350, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCDS_CANCELOK), SetStringTip(STR_BUTTON_CANCEL), SetFill(1, 0),
    EndContainer(),
  EndContainer(),
};
static constexpr NWidgetPart _nested_network_content_download_status_window_widgets[] = {…};
 
static WindowDesc _network_content_download_status_window_desc(
  WDP_CENTER, {}, 0, 0,
  WC_NETWORK_STATUS_WINDOW, WC_NONE,
  WindowDefaultFlag::Modal,
  _nested_network_content_download_status_window_widgets
);
 
BaseNetworkContentDownloadStatusWindow::BaseNetworkContentDownloadStatusWindow(WindowDesc &desc) : Window(desc)
{
  _network_content_client.AddCallback(this);
  _network_content_client.DownloadSelectedContent(this->total_files, this->total_bytes);
 
  this->InitNested(WN_NETWORK_STATUS_WINDOW_CONTENT_DOWNLOAD);
}
BaseNetworkContentDownloadStatusWindow::BaseNetworkContentDownloadStatusWindow(WindowDesc &desc) : Window(desc) {…}
 
void BaseNetworkContentDownloadStatusWindow::Close([[maybe_unused]] int data)
{
  _network_content_client.RemoveCallback(this);
  this->Window::Close();
}
void BaseNetworkContentDownloadStatusWindow::Close([[maybe_unused]] int data) {…}
 
void BaseNetworkContentDownloadStatusWindow::UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize)
{
  switch (widget) {
    case WID_NCDS_PROGRESS_BAR: {
      auto max_value = GetParamMaxDigits(8);
      size = GetStringBoundingBox(GetString(STR_CONTENT_DOWNLOAD_PROGRESS_SIZE, max_value, max_value, max_value));
      /* We need some spacing for the 'border' */
      size.height += WidgetDimensions::scaled.frametext.Horizontal();
      size.width  += WidgetDimensions::scaled.frametext.Vertical();
      break;
    }
 
    case WID_NCDS_PROGRESS_TEXT:
      size.height = GetCharacterHeight(FS_NORMAL) * 2 + WidgetDimensions::scaled.vsep_normal;
      break;
  }
}
void BaseNetworkContentDownloadStatusWindow::UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) {…}
 
void BaseNetworkContentDownloadStatusWindow::DrawWidget(const Rect &r, WidgetID widget) const
{
  switch (widget) {
    case WID_NCDS_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);
      DrawFrameRect(ir.WithWidth((uint64_t)ir.Width() * this->downloaded_bytes / this->total_bytes, _current_text_dir == TD_RTL), COLOUR_MAUVE, {});
      DrawString(ir.left, ir.right, CentreBounds(ir.top, ir.bottom, GetCharacterHeight(FS_NORMAL)),
        GetString(STR_CONTENT_DOWNLOAD_PROGRESS_SIZE, this->downloaded_bytes, this->total_bytes, this->downloaded_bytes * 100LL / this->total_bytes),
        TC_FROMSTRING, SA_HOR_CENTER);
      break;
    }
 
    case WID_NCDS_PROGRESS_TEXT:
      if (this->downloaded_bytes == this->total_bytes) {
        DrawStringMultiLine(r, STR_CONTENT_DOWNLOAD_COMPLETE, TC_FROMSTRING, SA_CENTER);
      } else if (!this->name.empty()) {
        DrawStringMultiLine(r,
          GetString(STR_CONTENT_DOWNLOAD_FILE, this->name, this->downloaded_files, this->total_files),
          TC_FROMSTRING, SA_CENTER);
      } else {
        DrawStringMultiLine(r, STR_CONTENT_DOWNLOAD_INITIALISE, TC_FROMSTRING, SA_CENTER);
      }
      break;
  }
}
void BaseNetworkContentDownloadStatusWindow::DrawWidget(const Rect &r, WidgetID widget) const {…}
 
void BaseNetworkContentDownloadStatusWindow::OnDownloadProgress(const ContentInfo &ci, int bytes)
{
  if (ci.id != this->cur_id) {
    this->name = ci.filename;
    this->cur_id = ci.id;
    this->downloaded_files++;
  }
 
  /* A negative value means we are resetting; for example, when retrying or using a fallback. */
  if (bytes < 0) {
    this->downloaded_bytes = 0;
  } else {
    this->downloaded_bytes += bytes;
  }
 
  this->SetDirty();
}
void BaseNetworkContentDownloadStatusWindow::OnDownloadProgress(const ContentInfo &ci, int bytes) {…}
 
 
struct NetworkContentDownloadStatusWindow : public BaseNetworkContentDownloadStatusWindow {
private:
  ContentTypes received_types{}; 
 
public:
  NetworkContentDownloadStatusWindow() : BaseNetworkContentDownloadStatusWindow(_network_content_download_status_window_desc)
  {
    this->parent = FindWindowById(WC_NETWORK_WINDOW, WN_NETWORK_WINDOW_CONTENT_LIST);
  }
  NetworkContentDownloadStatusWindow() : BaseNetworkContentDownloadStatusWindow(_network_content_download_status_window_desc) {…}
 
  void Close([[maybe_unused]] int data = 0) override
  {
    TarScanner::Modes modes{};
    for (auto ctype : this->received_types) {
      switch (ctype) {
        case CONTENT_TYPE_AI:
        case CONTENT_TYPE_AI_LIBRARY:
          /* AI::Rescan calls the scanner. */
          break;
        case CONTENT_TYPE_GAME:
        case CONTENT_TYPE_GAME_LIBRARY:
          /* Game::Rescan calls the scanner. */
          break;
 
        case CONTENT_TYPE_BASE_GRAPHICS:
        case CONTENT_TYPE_BASE_SOUNDS:
        case CONTENT_TYPE_BASE_MUSIC:
          modes.Set(TarScanner::Mode::Baseset);
          break;
 
        case CONTENT_TYPE_NEWGRF:
          /* ScanNewGRFFiles calls the scanner. */
          break;
 
        case CONTENT_TYPE_SCENARIO:
        case CONTENT_TYPE_HEIGHTMAP:
          modes.Set(TarScanner::Mode::Scenario);
          break;
 
        default:
          break;
      }
    }
 
    TarScanner::DoScan(modes);
 
    /* Tell all the backends about what we've downloaded */
    for (auto ctype : this->received_types) {
      switch (ctype) {
        case CONTENT_TYPE_AI:
        case CONTENT_TYPE_AI_LIBRARY:
          AI::Rescan();
          break;
 
        case CONTENT_TYPE_GAME:
        case CONTENT_TYPE_GAME_LIBRARY:
          Game::Rescan();
          break;
 
        case CONTENT_TYPE_BASE_GRAPHICS:
          BaseGraphics::FindSets();
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_OPTIONS);
          break;
 
        case CONTENT_TYPE_BASE_SOUNDS:
          BaseSounds::FindSets();
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_OPTIONS);
          break;
 
        case CONTENT_TYPE_BASE_MUSIC:
          BaseMusic::FindSets();
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_OPTIONS);
          break;
 
        case CONTENT_TYPE_NEWGRF:
          RequestNewGRFScan();
          break;
 
        case CONTENT_TYPE_SCENARIO:
        case CONTENT_TYPE_HEIGHTMAP:
          ScanScenarios();
          InvalidateWindowData(WC_SAVELOAD, 0, 0);
          break;
 
        default:
          break;
      }
    }
 
    /* Always invalidate the download window; tell it we are going to be gone */
    InvalidateWindowData(WC_NETWORK_WINDOW, WN_NETWORK_WINDOW_CONTENT_LIST, 2);
 
    this->BaseNetworkContentDownloadStatusWindow::Close();
  }
  void Close([[maybe_unused]] int data = 0) override {…}
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    if (widget == WID_NCDS_CANCELOK) {
      if (this->downloaded_bytes != this->total_bytes) {
        _network_content_client.Cancel();
        this->Close();
      } else {
        /* If downloading succeeded, close the online content window. This will close
         * the current window as well. */
        CloseWindowById(WC_NETWORK_WINDOW, WN_NETWORK_WINDOW_CONTENT_LIST);
      }
    }
  }
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override {…}
 
  void OnDownloadProgress(const ContentInfo &ci, int bytes) override
  {
    BaseNetworkContentDownloadStatusWindow::OnDownloadProgress(ci, bytes);
    this->received_types.Set(ci.type);
 
    /* When downloading is finished change cancel in ok */
    if (this->downloaded_bytes == this->total_bytes) {
      this->GetWidget<NWidgetCore>(WID_NCDS_CANCELOK)->SetString(STR_BUTTON_OK);
    }
  }
  void OnDownloadProgress(const ContentInfo &ci, int bytes) override {…}
};
struct NetworkContentDownloadStatusWindow : public BaseNetworkContentDownloadStatusWindow {…};
 
struct ContentListFilterData {
  StringFilter string_filter; 
  ContentTypes types; 
};
struct ContentListFilterData {…};
 
enum ContentListFilterCriteria : uint8_t {
  CONTENT_FILTER_TEXT = 0,        
  CONTENT_FILTER_TYPE_OR_SELECTED,
};
enum ContentListFilterCriteria : uint8_t {…};
 
class NetworkContentListWindow : public Window, ContentCallback {
  typedef GUIList<const ContentInfo *, std::nullptr_t, ContentListFilterData &> GUIContentList;
 
  static const uint EDITBOX_MAX_SIZE   =  50; 
 
  static Listing last_sorting;     
  static Filtering last_filtering; 
  static const std::initializer_list<GUIContentList::SortFunction * const> sorter_funcs;   
  static const std::initializer_list<GUIContentList::FilterFunction * const> filter_funcs; 
  GUIContentList content{}; 
  bool auto_select = false; 
  ContentListFilterData filter_data{}; 
  QueryString filter_editbox; 
  Dimension checkbox_size{}; 
 
  const ContentInfo *selected = nullptr; 
  int list_pos = 0; 
  uint filesize_sum = 0; 
  Scrollbar *vscroll = nullptr; 
 
  static std::string content_type_strs[CONTENT_TYPE_END]; 
 
  void OpenExternalSearch()
  {
    std::string url;
    url.reserve(1024);
 
    url += "https://grfsearch.openttd.org/?";
 
    if (this->auto_select) {
      url += "do=searchgrfid&q=";
 
      bool first = true;
      for (const ContentInfo *ci : this->content) {
        if (ci->state != ContentInfo::State::DoesNotExist) continue;
 
        if (!first) url.push_back(',');
        first = false;
 
        format_append(url, "{:08X}:{}", ci->unique_id, FormatArrayAsHex(ci->md5sum));
      }
    } else {
      url += "do=searchtext&q=";
 
      /* Escape search term */
      for (char search : this->filter_editbox.text.GetText()) {
        /* Remove quotes */
        if (search == '\'' || search == '"') continue;
 
        /* Escape special chars, such as &%,= */
        if (static_cast<unsigned char>(search) < 0x30) {
          format_append(url, "%{:02X}", search);
        } else {
          url.push_back(search);
        }
      }
    }
 
    OpenBrowser(url);
  }
  void OpenExternalSearch() {…}
 
  static void ExternalSearchDisclaimerCallback(Window *w, bool accepted)
  {
    if (accepted) {
      _accepted_external_search = true;
      ((NetworkContentListWindow*)w)->OpenExternalSearch();
    }
  }
  static void ExternalSearchDisclaimerCallback(Window *w, bool accepted) {…}
 
  void BuildContentList()
  {
    if (!this->content.NeedRebuild()) return;
 
    /* Create temporary array of games to use for listing */
    this->content.clear();
 
    bool all_available = true;
 
    for (const ContentInfo &ci : _network_content_client.Info()) {
      if (ci.state == ContentInfo::State::DoesNotExist) all_available = false;
      this->content.push_back(&ci);
    }
 
    this->SetWidgetDisabledState(WID_NCL_SEARCH_EXTERNAL, this->auto_select && all_available);
 
    this->FilterContentList();
    this->content.RebuildDone();
    this->SortContentList();
 
    this->vscroll->SetCount(this->content.size()); // Update the scrollbar
    this->ScrollToSelected();
  }
  void BuildContentList() {…}
 
  static bool NameSorter(const ContentInfo * const &a, const ContentInfo * const &b)
  {
    return StrNaturalCompare(a->name, b->name, true) < 0; // Sort by name (natural sorting).
  }
  static bool NameSorter(const ContentInfo * const &a, const ContentInfo * const &b) {…}
 
  static bool TypeSorter(const ContentInfo * const &a, const ContentInfo * const &b)
  {
    int r = 0;
    if (a->type != b->type) {
      r = StrNaturalCompare(content_type_strs[a->type], content_type_strs[b->type]);
    }
    if (r == 0) return NameSorter(a, b);
    return r < 0;
  }
  static bool TypeSorter(const ContentInfo * const &a, const ContentInfo * const &b) {…}
 
  static bool StateSorter(const ContentInfo * const &a, const ContentInfo * const &b)
  {
    int r = to_underlying(a->state) - to_underlying(b->state);
    if (r == 0) return TypeSorter(a, b);
    return r < 0;
  }
  static bool StateSorter(const ContentInfo * const &a, const ContentInfo * const &b) {…}
 
  void SortContentList()
  {
    if (!this->content.Sort()) return;
 
    int idx = find_index(this->content, this->selected);
    if (idx >= 0) this->list_pos = idx;
  }
  void SortContentList() {…}
 
  static bool TagNameFilter(const ContentInfo * const *a, ContentListFilterData &filter)
  {
    if ((*a)->state == ContentInfo::State::Selected || (*a)->state == ContentInfo::State::Autoselected) return true;
 
    filter.string_filter.ResetState();
    for (auto &tag : (*a)->tags) filter.string_filter.AddLine(tag);
 
    filter.string_filter.AddLine((*a)->name);
    return filter.string_filter.GetState();
  }
  static bool TagNameFilter(const ContentInfo * const *a, ContentListFilterData &filter) {…}
 
  static bool TypeOrSelectedFilter(const ContentInfo * const *a, ContentListFilterData &filter)
  {
    if (filter.types.None()) return true;
    if (filter.types.Test((*a)->type)) return true;
    return ((*a)->state == ContentInfo::State::Selected || (*a)->state == ContentInfo::State::Autoselected);
  }
  static bool TypeOrSelectedFilter(const ContentInfo * const *a, ContentListFilterData &filter) {…}
 
  void FilterContentList()
  {
    /* Apply filters. */
    bool changed = false;
    if (!this->filter_data.string_filter.IsEmpty()) {
      this->content.SetFilterType(CONTENT_FILTER_TEXT);
      changed |= this->content.Filter(this->filter_data);
    }
    if (this->filter_data.types.Any()) {
      this->content.SetFilterType(CONTENT_FILTER_TYPE_OR_SELECTED);
      changed |= this->content.Filter(this->filter_data);
    }
    if (!changed) return;
 
    /* update list position */
    int idx = find_index(this->content, this->selected);
    if (idx >= 0) {
      this->list_pos = idx;
      return;
    }
 
    /* previously selected item not in list anymore */
    this->selected = nullptr;
    this->list_pos = 0;
  }
  void FilterContentList() {…}
 
  bool UpdateFilterState()
  {
    Filtering old_params = this->content.GetFiltering();
    bool new_state = !this->filter_data.string_filter.IsEmpty() || this->filter_data.types.Any();
    if (new_state != old_params.state) {
      this->content.SetFilterState(new_state);
    }
    return new_state != old_params.state;
  }
  bool UpdateFilterState() {…}
 
  void ScrollToSelected()
  {
    if (this->selected == nullptr) return;
 
    this->vscroll->ScrollTowards(this->list_pos);
  }
  void ScrollToSelected() {…}
 
  friend void BuildContentTypeStringList();
public:
  NetworkContentListWindow(WindowDesc &desc, bool select_all, ContentTypes types) :
      Window(desc),
      auto_select(select_all),
      filter_editbox(EDITBOX_MAX_SIZE)
  {
    this->CreateNestedTree();
    this->vscroll = this->GetScrollbar(WID_NCL_SCROLLBAR);
    this->FinishInitNested(WN_NETWORK_WINDOW_CONTENT_LIST);
 
    this->GetWidget<NWidgetStacked>(WID_NCL_SEL_ALL_UPDATE)->SetDisplayedPlane(select_all);
 
    this->querystrings[WID_NCL_FILTER] = &this->filter_editbox;
    this->filter_editbox.cancel_button = QueryString::ACTION_CLEAR;
    this->SetFocusedWidget(WID_NCL_FILTER);
    this->SetWidgetDisabledState(WID_NCL_SEARCH_EXTERNAL, this->auto_select);
    this->filter_data.types = types;
 
    _network_content_client.AddCallback(this);
    this->content.SetListing(this->last_sorting);
    this->content.SetFiltering(this->last_filtering);
    this->content.SetSortFuncs(this->sorter_funcs);
    this->content.SetFilterFuncs(this->filter_funcs);
    this->UpdateFilterState();
    this->content.ForceRebuild();
    this->FilterContentList();
    this->SortContentList();
    this->InvalidateData();
  }
  NetworkContentListWindow(WindowDesc &desc, bool select_all, ContentTypes types) : {…}
 
  void Close([[maybe_unused]] int data = 0) override
  {
    _network_content_client.RemoveCallback(this);
    this->Window::Close();
  }
  void Close([[maybe_unused]] int data = 0) override {…}
 
  void OnInit() override
  {
    this->checkbox_size = maxdim(maxdim(GetScaledSpriteSize(SPR_BOX_EMPTY), GetScaledSpriteSize(SPR_BOX_CHECKED)), GetScaledSpriteSize(SPR_BLOT));
  }
  void OnInit() override {…}
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_NCL_CHECKBOX:
        size.width = this->checkbox_size.width + padding.width;
        break;
 
      case WID_NCL_TYPE: {
        Dimension d = size;
        for (int i = CONTENT_TYPE_BEGIN; i < CONTENT_TYPE_END; i++) {
          d = maxdim(d, GetStringBoundingBox(STR_CONTENT_TYPE_BASE_GRAPHICS + i - CONTENT_TYPE_BASE_GRAPHICS));
        }
        size.width = d.width + padding.width;
        break;
      }
 
      case WID_NCL_MATRIX:
        resize.height = std::max(this->checkbox_size.height, (uint)GetCharacterHeight(FS_NORMAL)) + padding.height;
        size.height = 10 * resize.height;
        break;
    }
  }
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override {…}
 
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_NCL_DETAILS:
        this->DrawDetails(r);
        break;
 
      case WID_NCL_MATRIX:
        this->DrawMatrix(r);
        break;
    }
  }
  void DrawWidget(const Rect &r, WidgetID widget) const override {…}
 
  void OnPaint() override
  {
    const SortButtonState arrow = this->content.IsDescSortOrder() ? SBS_DOWN : SBS_UP;
 
    if (this->content.NeedRebuild()) {
      this->BuildContentList();
    }
 
    this->DrawWidgets();
 
    switch (this->content.SortType()) {
      case WID_NCL_CHECKBOX - WID_NCL_CHECKBOX: this->DrawSortButtonState(WID_NCL_CHECKBOX, arrow); break;
      case WID_NCL_TYPE     - WID_NCL_CHECKBOX: this->DrawSortButtonState(WID_NCL_TYPE,     arrow); break;
      case WID_NCL_NAME     - WID_NCL_CHECKBOX: this->DrawSortButtonState(WID_NCL_NAME,     arrow); break;
    }
  }
  void OnPaint() override {…}
 
  void DrawMatrix(const Rect &r) const
  {
    const Rect checkbox = this->GetWidget<NWidgetBase>(WID_NCL_CHECKBOX)->GetCurrentRect();
    const Rect name = this->GetWidget<NWidgetBase>(WID_NCL_NAME)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
    const Rect type = this->GetWidget<NWidgetBase>(WID_NCL_TYPE)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
 
    /* Fill the matrix with the information */
    const uint step_height = this->GetWidget<NWidgetBase>(WID_NCL_MATRIX)->resize_y;
    const int text_y_offset = WidgetDimensions::scaled.matrix.top + (step_height - WidgetDimensions::scaled.matrix.Vertical() - GetCharacterHeight(FS_NORMAL)) / 2;
 
    Rect mr = r.WithHeight(step_height);
    auto [first, last] = this->vscroll->GetVisibleRangeIterators(this->content);
    for (auto iter = first; iter != last; iter++) {
      const ContentInfo *ci = *iter;
 
      if (ci == this->selected) GfxFillRect(mr.Shrink(WidgetDimensions::scaled.bevel), PC_GREY);
 
      SpriteID sprite;
      SpriteID pal = PAL_NONE;
      switch (ci->state) {
        case ContentInfo::State::Unselected: sprite = SPR_BOX_EMPTY; break;
        case ContentInfo::State::Selected: sprite = SPR_BOX_CHECKED; break;
        case ContentInfo::State::Autoselected: sprite = SPR_BOX_CHECKED; break;
        case ContentInfo::State::AlreadyHere: sprite = SPR_BLOT; pal = PALETTE_TO_GREEN; break;
        case ContentInfo::State::DoesNotExist: sprite = SPR_BLOT; pal = PALETTE_TO_RED; break;
        default: NOT_REACHED();
      }
      DrawSpriteIgnorePadding(sprite, pal, {checkbox.left, mr.top, checkbox.right, mr.bottom}, SA_CENTER);
 
      StringID str = STR_CONTENT_TYPE_BASE_GRAPHICS + ci->type - CONTENT_TYPE_BASE_GRAPHICS;
      DrawString(type.left, type.right, mr.top + text_y_offset, str, TC_BLACK, SA_HOR_CENTER);
 
      DrawString(name.left, name.right, mr.top + text_y_offset, ci->name, TC_BLACK);
      mr = mr.Translate(0, step_height);
    }
  }
  void DrawMatrix(const Rect &r) const {…}
 
  void DrawDetails(const Rect &r) const
  {
    /* Height for the title banner */
    int HEADER_HEIGHT = 3 * GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.frametext.Vertical();
 
    Rect hr = r.WithHeight(HEADER_HEIGHT).Shrink(WidgetDimensions::scaled.frametext);
    Rect tr = r.Shrink(WidgetDimensions::scaled.frametext);
    tr.top += HEADER_HEIGHT;
 
    /* Create the nice darker rectangle at the details top */
    GfxFillRect(r.WithHeight(HEADER_HEIGHT).Shrink(WidgetDimensions::scaled.bevel.left, WidgetDimensions::scaled.bevel.top, WidgetDimensions::scaled.bevel.right, 0), GetColourGradient(COLOUR_LIGHT_BLUE, SHADE_NORMAL));
    DrawString(hr.left, hr.right, hr.top, STR_CONTENT_DETAIL_TITLE, TC_FROMSTRING, SA_HOR_CENTER);
 
    /* Draw the total download size */
    DrawString(tr.left, tr.right, tr.bottom - GetCharacterHeight(FS_NORMAL) + 1, GetString(STR_CONTENT_TOTAL_DOWNLOAD_SIZE, this->filesize_sum));
 
    if (this->selected == nullptr) return;
 
    /* And fill the rest of the details when there's information to place there */
    DrawStringMultiLine(hr.left, hr.right, hr.top + GetCharacterHeight(FS_NORMAL), hr.bottom, STR_CONTENT_DETAIL_SUBTITLE_UNSELECTED + to_underlying(this->selected->state), TC_FROMSTRING, SA_CENTER);
 
    /* Also show the total download size, so keep some space from the bottom */
    tr.bottom -= GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_wide;
 
    if (this->selected->upgrade) {
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_UPDATE, STR_CONTENT_TYPE_BASE_GRAPHICS + this->selected->type - CONTENT_TYPE_BASE_GRAPHICS));
      tr.top += WidgetDimensions::scaled.vsep_wide;
    }
 
    tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_NAME, this->selected->name));
 
    if (!this->selected->version.empty()) {
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_VERSION, this->selected->version));
    }
 
    if (!this->selected->description.empty()) {
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_DESCRIPTION, this->selected->description));
    }
 
    if (!this->selected->url.empty()) {
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_URL, this->selected->url));
    }
 
    tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_TYPE, STR_CONTENT_TYPE_BASE_GRAPHICS + this->selected->type - CONTENT_TYPE_BASE_GRAPHICS));
 
    tr.top += WidgetDimensions::scaled.vsep_wide;
    tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_FILESIZE, this->selected->filesize));
 
    std::string_view list_separator = GetListSeparator();
    if (!this->selected->dependencies.empty()) {
      /* List dependencies */
      std::string buf;
      for (auto &cid : this->selected->dependencies) {
        /* Try to find the dependency */
        for (const ContentInfo &ci : _network_content_client.Info()) {
          if (ci.id != cid) continue;
 
          if (!buf.empty()) buf += list_separator;
          buf += ci.name;
          break;
        }
      }
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_DEPENDENCIES, std::move(buf)));
    }
 
    if (!this->selected->tags.empty()) {
      /* List all tags */
      std::string buf;
      for (auto &tag : this->selected->tags) {
        if (!buf.empty()) buf += list_separator;
        buf += tag;
      }
      tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_TAGS, std::move(buf)));
    }
 
    if (this->selected->IsSelected()) {
      /* When selected show all manually selected content that depends on this */
      ConstContentVector tree;
      _network_content_client.ReverseLookupTreeDependency(tree, this->selected);
 
      std::string buf;
      for (const ContentInfo *ci : tree) {
        if (ci == this->selected || ci->state != ContentInfo::State::Selected) continue;
 
        if (!buf.empty()) buf += list_separator;
        buf += ci->name;
      }
      if (!buf.empty()) {
        tr.top = DrawStringMultiLine(tr, GetString(STR_CONTENT_DETAIL_SELECTED_BECAUSE_OF, std::move(buf)));
      }
    }
  }
  void DrawDetails(const Rect &r) const {…}
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    if (widget >= WID_NCL_TEXTFILE && widget < WID_NCL_TEXTFILE + TFT_CONTENT_END) {
      if (this->selected == nullptr || this->selected->state != ContentInfo::State::AlreadyHere) return;
 
      ShowContentTextfileWindow(this, (TextfileType)(widget - WID_NCL_TEXTFILE), this->selected);
      return;
    }
 
    switch (widget) {
      case WID_NCL_MATRIX: {
        auto it = this->vscroll->GetScrolledItemFromWidget(this->content, pt.y, this, WID_NCL_MATRIX);
        if (it == this->content.end()) return; // click out of bounds
 
        const NWidgetBase *checkbox = this->GetWidget<NWidgetBase>(WID_NCL_CHECKBOX);
        if (click_count > 1 || IsInsideBS(pt.x, checkbox->pos_x, checkbox->current_x)) {
          _network_content_client.ToggleSelectedState(**it);
          this->content.ForceResort();
          this->content.ForceRebuild();
        } else {
          this->selected = *it;
          this->list_pos = it - this->content.begin();
        }
 
        if (this->filter_data.types.Any()) {
          this->content.ForceRebuild();
        }
 
        this->InvalidateData();
        break;
      }
 
      case WID_NCL_CHECKBOX:
      case WID_NCL_TYPE:
      case WID_NCL_NAME:
        if (this->content.SortType() == widget - WID_NCL_CHECKBOX) {
          this->content.ToggleSortOrder();
          if (!this->content.empty()) this->list_pos = (int)this->content.size() - this->list_pos - 1;
        } else {
          this->content.SetSortType(widget - WID_NCL_CHECKBOX);
          this->content.ForceResort();
          this->SortContentList();
        }
        this->ScrollToSelected();
        this->InvalidateData();
        break;
 
      case WID_NCL_SELECT_ALL:
        _network_content_client.SelectAll();
        this->InvalidateData();
        break;
 
      case WID_NCL_SELECT_UPDATE:
        _network_content_client.SelectUpgrade();
        this->InvalidateData();
        break;
 
      case WID_NCL_UNSELECT:
        _network_content_client.UnselectAll();
        this->InvalidateData();
        break;
 
      case WID_NCL_OPEN_URL:
        if (this->selected != nullptr) {
          OpenBrowser(this->selected->url);
        }
        break;
 
      case WID_NCL_DOWNLOAD:
        if (BringWindowToFrontById(WC_NETWORK_STATUS_WINDOW, WN_NETWORK_STATUS_WINDOW_CONTENT_DOWNLOAD) == nullptr) new NetworkContentDownloadStatusWindow();
        break;
 
      case WID_NCL_SEARCH_EXTERNAL:
        if (_accepted_external_search) {
          this->OpenExternalSearch();
        } else {
          ShowQuery(
            GetEncodedString(STR_CONTENT_SEARCH_EXTERNAL_DISCLAIMER_CAPTION),
            GetEncodedString(STR_CONTENT_SEARCH_EXTERNAL_DISCLAIMER),
            this, ExternalSearchDisclaimerCallback);
        }
        break;
    }
  }
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override {…}
 
  EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
  {
    if (this->vscroll->UpdateListPositionOnKeyPress(this->list_pos, keycode) == ES_NOT_HANDLED) {
      switch (keycode) {
        case WKC_SPACE:
        case WKC_RETURN:
          if (keycode == WKC_RETURN || !IsWidgetFocused(WID_NCL_FILTER)) {
            if (this->selected != nullptr) {
              _network_content_client.ToggleSelectedState(*this->selected);
              this->content.ForceResort();
              this->InvalidateData();
            }
            if (this->filter_data.types.Any()) {
              this->content.ForceRebuild();
              this->InvalidateData();
            }
            return ES_HANDLED;
          }
          /* space is pressed and filter is focused. */
          [[fallthrough]];
 
        default:
          return ES_NOT_HANDLED;
      }
    }
 
    if (this->content.empty()) {
      if (this->UpdateFilterState()) {
        this->content.ForceRebuild();
        this->InvalidateData();
      }
      return ES_HANDLED;
    }
 
    this->selected = this->content[this->list_pos];
 
    if (this->UpdateFilterState()) {
      this->content.ForceRebuild();
    } else {
      /* Scroll to the new content if it is outside the current range. */
      this->ScrollToSelected();
    }
 
    /* redraw window */
    this->InvalidateData();
    return ES_HANDLED;
  }
  EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override {…}
 
  void OnEditboxChanged(WidgetID wid) override
  {
    if (wid == WID_NCL_FILTER) {
      this->filter_data.string_filter.SetFilterTerm(this->filter_editbox.text.GetText());
      this->UpdateFilterState();
      this->content.ForceRebuild();
      this->InvalidateData();
    }
  }
  void OnEditboxChanged(WidgetID wid) override {…}
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_NCL_MATRIX);
  }
  void OnResize() override {…}
 
  void OnReceiveContentInfo(const ContentInfo &rci) override
  {
    if (this->auto_select && !rci.IsSelected()) _network_content_client.ToggleSelectedState(rci);
    this->content.ForceRebuild();
    this->InvalidateData(0, false);
  }
  void OnReceiveContentInfo(const ContentInfo &rci) override {…}
 
  void OnDownloadComplete(ContentID) override
  {
    this->content.ForceResort();
    this->InvalidateData();
  }
  void OnDownloadComplete(ContentID) override {…}
 
  void OnConnect(bool success) override
  {
    if (!success) {
      ShowErrorMessage(GetEncodedString(STR_CONTENT_ERROR_COULD_NOT_CONNECT), {}, WL_ERROR);
      this->Close();
      return;
    }
 
    this->InvalidateData();
  }
  void OnConnect(bool success) override {…}
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
    if (this->content.NeedRebuild()) this->BuildContentList();
 
    /* To sum all the bytes we intend to download */
    this->filesize_sum = 0;
    bool show_select_all = false;
    bool show_select_upgrade = false;
    for (const ContentInfo *ci : this->content) {
      switch (ci->state) {
        case ContentInfo::State::Selected:
        case ContentInfo::State::Autoselected:
          this->filesize_sum += ci->filesize;
          break;
 
        case ContentInfo::State::Unselected:
          show_select_all = true;
          show_select_upgrade |= ci->upgrade;
          break;
 
        default:
          break;
      }
    }
 
    /* If data == 2 then the status window caused this OnInvalidate */
    this->SetWidgetDisabledState(WID_NCL_DOWNLOAD, this->filesize_sum == 0 || (FindWindowById(WC_NETWORK_STATUS_WINDOW, WN_NETWORK_STATUS_WINDOW_CONTENT_DOWNLOAD) != nullptr && data != 2));
    this->SetWidgetDisabledState(WID_NCL_UNSELECT, this->filesize_sum == 0);
    this->SetWidgetDisabledState(WID_NCL_SELECT_ALL, !show_select_all);
    this->SetWidgetDisabledState(WID_NCL_SELECT_UPDATE, !show_select_upgrade || !this->filter_data.string_filter.IsEmpty());
    this->SetWidgetDisabledState(WID_NCL_OPEN_URL, this->selected == nullptr || this->selected->url.empty());
    for (TextfileType tft = TFT_CONTENT_BEGIN; tft < TFT_CONTENT_END; tft++) {
      this->SetWidgetDisabledState(WID_NCL_TEXTFILE + tft, this->selected == nullptr || this->selected->state != ContentInfo::State::AlreadyHere || !this->selected->GetTextfile(tft).has_value());
    }
  }
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override {…}
};
 
Listing NetworkContentListWindow::last_sorting = {false, 1};
Filtering NetworkContentListWindow::last_filtering = {false, 0};
 
const std::initializer_list<NetworkContentListWindow::GUIContentList::SortFunction * const> NetworkContentListWindow::sorter_funcs = {
  &StateSorter,
  &TypeSorter,
  &NameSorter,
};
const std::initializer_list<NetworkContentListWindow::GUIContentList::SortFunction * const> NetworkContentListWindow::sorter_funcs = {…};
 
const std::initializer_list<NetworkContentListWindow::GUIContentList::FilterFunction * const> NetworkContentListWindow::filter_funcs = {
  &TagNameFilter,
  &TypeOrSelectedFilter,
};
const std::initializer_list<NetworkContentListWindow::GUIContentList::FilterFunction * const> NetworkContentListWindow::filter_funcs = {…};
 
std::string NetworkContentListWindow::content_type_strs[CONTENT_TYPE_END];
 
void BuildContentTypeStringList()
{
  for (int i = CONTENT_TYPE_BEGIN; i < CONTENT_TYPE_END; i++) {
    NetworkContentListWindow::content_type_strs[i] = GetString(STR_CONTENT_TYPE_BASE_GRAPHICS + i - CONTENT_TYPE_BASE_GRAPHICS);
  }
}
void BuildContentTypeStringList() {…};
  friend void BuildContentTypeStringList(); {…}
 
static constexpr NWidgetPart _nested_network_content_list_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_LIGHT_BLUE),
    NWidget(WWT_CAPTION, COLOUR_LIGHT_BLUE), SetStringTip(STR_CONTENT_TITLE),
    NWidget(WWT_DEFSIZEBOX, COLOUR_LIGHT_BLUE),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_LIGHT_BLUE, WID_NCL_BACKGROUND),
    NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_wide, 0), SetPadding(WidgetDimensions::unscaled.sparse_resize),
      /* Top */
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
        NWidget(WWT_TEXT, INVALID_COLOUR, WID_NCL_FILTER_CAPT), SetFill(1, 0), SetResize(1, 0), SetStringTip(STR_CONTENT_FILTER_TITLE), SetAlignment(SA_RIGHT | SA_VERT_CENTER),
        NWidget(WWT_EDITBOX, COLOUR_LIGHT_BLUE, WID_NCL_FILTER), SetFill(1, 0), SetResize(1, 0),
            SetStringTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
      EndContainer(),
      /* Lists and info. */
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
        /* Left side. */
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_sparse, 0),
          NWidget(NWID_HORIZONTAL),
            NWidget(NWID_VERTICAL),
              NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_CHECKBOX), SetStringTip(STR_EMPTY),
                NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_TYPE),
                    SetStringTip(STR_CONTENT_TYPE_CAPTION, STR_CONTENT_TYPE_CAPTION_TOOLTIP),
                NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_NAME), SetResize(1, 0), SetFill(1, 0),
                    SetStringTip(STR_CONTENT_NAME_CAPTION, STR_CONTENT_NAME_CAPTION_TOOLTIP),
              EndContainer(),
              NWidget(WWT_MATRIX, COLOUR_LIGHT_BLUE, WID_NCL_MATRIX), SetResize(1, 1), SetFill(1, 1), SetScrollbar(WID_NCL_SCROLLBAR), SetMatrixDataTip(1, 0, STR_CONTENT_MATRIX_TOOLTIP),
            EndContainer(),
            NWidget(NWID_VSCROLLBAR, COLOUR_LIGHT_BLUE, WID_NCL_SCROLLBAR),
          EndContainer(),
          NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
            NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NCL_SEL_ALL_UPDATE),
              NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_SELECT_UPDATE), SetResize(1, 0), SetFill(1, 0),
                  SetStringTip(STR_CONTENT_SELECT_UPDATES_CAPTION, STR_CONTENT_SELECT_UPDATES_CAPTION_TOOLTIP),
              NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_SELECT_ALL), SetResize(1, 0), SetFill(1, 0),
                  SetStringTip(STR_CONTENT_SELECT_ALL_CAPTION, STR_CONTENT_SELECT_ALL_CAPTION_TOOLTIP),
            EndContainer(),
            NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_UNSELECT), SetResize(1, 0), SetFill(1, 0),
                  SetStringTip(STR_CONTENT_UNSELECT_ALL_CAPTION, STR_CONTENT_UNSELECT_ALL_CAPTION_TOOLTIP),
          EndContainer(),
        EndContainer(),
        /* Right side. */
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_sparse, 0),
          NWidget(WWT_PANEL, COLOUR_LIGHT_BLUE, WID_NCL_DETAILS), SetResize(1, 1), SetFill(1, 1),
          EndContainer(),
          NWidget(NWID_VERTICAL),
            NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
              NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_OPEN_URL), SetResize(1, 0), SetFill(1, 0), SetStringTip(STR_CONTENT_OPEN_URL, STR_CONTENT_OPEN_URL_TOOLTIP),
              NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_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_WHITE, WID_NCL_TEXTFILE + TFT_CHANGELOG), SetFill(1, 0), SetResize(1, 0), SetStringTip(STR_TEXTFILE_VIEW_CHANGELOG, STR_TEXTFILE_VIEW_CHANGELOG_TOOLTIP),
              NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_TEXTFILE + TFT_LICENSE), SetFill(1, 0), SetResize(1, 0), SetStringTip(STR_TEXTFILE_VIEW_LICENCE, STR_TEXTFILE_VIEW_LICENCE_TOOLTIP),
            EndContainer(),
          EndContainer(),
        EndContainer(),
      EndContainer(),
      /* Bottom. */
      NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_SEARCH_EXTERNAL), SetResize(1, 0), SetFill(1, 0),
            SetStringTip(STR_CONTENT_SEARCH_EXTERNAL, STR_CONTENT_SEARCH_EXTERNAL_TOOLTIP),
        NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NCL_DOWNLOAD), SetResize(1, 0), SetFill(1, 0),
            SetStringTip(STR_CONTENT_DOWNLOAD_CAPTION, STR_CONTENT_DOWNLOAD_CAPTION_TOOLTIP),
      EndContainer(),
    EndContainer(),
    /* Resize button. */
    NWidget(NWID_HORIZONTAL),
      NWidget(NWID_SPACER), SetFill(1, 0), SetResize(1, 0),
      NWidget(WWT_RESIZEBOX, COLOUR_LIGHT_BLUE), SetResizeWidgetTypeTip(RWV_HIDE_BEVEL, STR_TOOLTIP_RESIZE),
    EndContainer(),
  EndContainer(),
};
static constexpr NWidgetPart _nested_network_content_list_widgets[] = {…};
 
static WindowDesc _network_content_list_desc(
  WDP_CENTER, "list_content", 630, 460,
  WC_NETWORK_WINDOW, WC_NONE,
  {},
  _nested_network_content_list_widgets
);
 
void ShowNetworkContentListWindow(ContentVector *cv, ContentType type1, ContentType type2)
{
#if defined(WITH_ZLIB)
  ContentTypes types{};
  _network_content_client.Clear();
  if (cv == nullptr) {
    assert(type1 != CONTENT_TYPE_END || type2 == CONTENT_TYPE_END);
    assert(type1 == CONTENT_TYPE_END || type1 != type2);
    _network_content_client.RequestContentList(type1);
    if (type2 != CONTENT_TYPE_END) _network_content_client.RequestContentList(type2);
 
    if (type1 != CONTENT_TYPE_END) types.Set(type1);
    if (type2 != CONTENT_TYPE_END) types.Set(type2);
  } else {
    _network_content_client.RequestContentList(cv, true);
  }
 
  CloseWindowById(WC_NETWORK_WINDOW, WN_NETWORK_WINDOW_CONTENT_LIST);
  new NetworkContentListWindow(_network_content_list_desc, cv != nullptr, types);
#else
  ShowErrorMessage(
    GetEncodedString(STR_CONTENT_NO_ZLIB),
    GetEncodedString(STR_CONTENT_NO_ZLIB_SUB),
    WL_ERROR);
#endif /* WITH_ZLIB */
}
void ShowNetworkContentListWindow(ContentVector *cv, ContentType type1, ContentType type2) {…}
class NetworkContentListWindow : public Window, ContentCallback {…};