intro_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 "gui.h"
#include "window_gui.h"
#include "window_func.h"
#include "textbuf_gui.h"
#include "network/network.h"
#include "genworld.h"
#include "network/network_gui.h"
#include "network/network_content.h"
#include "landscape_type.h"
#include "landscape.h"
#include "strings_func.h"
#include "fios.h"
#include "ai/ai_gui.hpp"
#include "game/game_gui.hpp"
#include "gfx_func.h"
#include "core/geometry_func.hpp"
#include "language.h"
#include "rev.h"
#include "highscore.h"
#include "signs_base.h"
#include "viewport_func.h"
#include "vehicle_base.h"
#include <regex>
 
#include "widgets/intro_widget.h"
 
#include "table/strings.h"
#include "table/sprites.h"
 
#include "safeguards.h"
 
 
struct IntroGameViewportCommand {
  enum AlignmentH : byte {
    LEFT,
    CENTRE,
    RIGHT,
  };
  enum AlignmentV : byte {
    TOP,
    MIDDLE,
    BOTTOM,
  };
 
  int command_index = 0;               
  Point position{ 0, 0 };              
  VehicleID vehicle = INVALID_VEHICLE; 
  uint delay = 0;                      
  int zoom_adjust = 0;                 
  bool pan_to_next = false;            
  AlignmentH align_h = CENTRE;         
  AlignmentV align_v = MIDDLE;         
 
  Point PositionForViewport(const Viewport *vp)
  {
    if (this->vehicle != INVALID_VEHICLE) {
      const Vehicle *v = Vehicle::Get(this->vehicle);
      this->position = RemapCoords(v->x_pos, v->y_pos, v->z_pos);
    }
 
    Point p;
    switch (this->align_h) {
      case LEFT: p.x = this->position.x; break;
      case CENTRE: p.x = this->position.x - vp->virtual_width / 2; break;
      case RIGHT: p.x = this->position.x - vp->virtual_width; break;
    }
    switch (this->align_v) {
      case TOP: p.y = this->position.y; break;
      case MIDDLE: p.y = this->position.y - vp->virtual_height / 2; break;
      case BOTTOM: p.y = this->position.y - vp->virtual_height; break;
    }
    return p;
  }
};
 
 
struct SelectGameWindow : public Window {
  std::vector<IntroGameViewportCommand> intro_viewport_commands;
  size_t cur_viewport_command_index;
  uint cur_viewport_command_time;
  uint mouse_idle_time;
  Point mouse_idle_pos;
 
  void ReadIntroGameViewportCommands()
  {
    intro_viewport_commands.clear();
 
    /* Regular expression matching the commands: T, spaces, integer, spaces, flags, spaces, integer */
    const char *sign_langauge = "^T\\s*([0-9]+)\\s*([-+A-Z0-9]+)\\s*([0-9]+)";
    std::regex re(sign_langauge, std::regex_constants::icase);
 
    /* List of signs successfully parsed to delete afterwards. */
    std::vector<SignID> signs_to_delete;
 
    for (const Sign *sign : Sign::Iterate()) {
      std::smatch match;
      if (std::regex_search(sign->name, match, re)) {
        IntroGameViewportCommand vc;
        /* Sequence index from the first matching group. */
        vc.command_index = std::stoi(match[1].str());
        /* Sign coordinates for positioning. */
        vc.position = RemapCoords(sign->x, sign->y, sign->z);
        /* Delay from the third matching group. */
        vc.delay = std::stoi(match[3].str()) * 1000; // milliseconds
 
        /* Parse flags from second matching group. */
        enum IdType {
          ID_NONE, ID_VEHICLE
        } id_type = ID_NONE;
        for (char c : match[2].str()) {
          if (isdigit(c)) {
            if (id_type == ID_VEHICLE) {
              vc.vehicle = vc.vehicle * 10 + (c - '0');
            }
          } else {
            id_type = ID_NONE;
            switch (toupper(c)) {
              case '-': vc.zoom_adjust = +1; break;
              case '+': vc.zoom_adjust = -1; break;
              case 'T': vc.align_v = IntroGameViewportCommand::TOP; break;
              case 'M': vc.align_v = IntroGameViewportCommand::MIDDLE; break;
              case 'B': vc.align_v = IntroGameViewportCommand::BOTTOM; break;
              case 'L': vc.align_h = IntroGameViewportCommand::LEFT; break;
              case 'C': vc.align_h = IntroGameViewportCommand::CENTRE; break;
              case 'R': vc.align_h = IntroGameViewportCommand::RIGHT; break;
              case 'P': vc.pan_to_next = true; break;
              case 'V': id_type = ID_VEHICLE; vc.vehicle = 0; break;
            }
          }
        }
 
        /* Successfully parsed, store. */
        intro_viewport_commands.push_back(vc);
        signs_to_delete.push_back(sign->index);
      }
    }
 
    /* Sort the commands by sequence index. */
    std::sort(intro_viewport_commands.begin(), intro_viewport_commands.end(), [](const IntroGameViewportCommand &a, const IntroGameViewportCommand &b) { return a.command_index < b.command_index; });
 
    /* Delete all the consumed signs, from last ID to first ID. */
    std::sort(signs_to_delete.begin(), signs_to_delete.end(), [](SignID a, SignID b) { return a > b; });
    for (SignID sign_id : signs_to_delete) {
      delete Sign::Get(sign_id);
    }
  }
 
  SelectGameWindow(WindowDesc *desc) : Window(desc)
  {
    this->CreateNestedTree();
    this->FinishInitNested(0);
    this->OnInvalidateData();
 
    this->ReadIntroGameViewportCommands();
 
    this->cur_viewport_command_index = (size_t)-1;
    this->cur_viewport_command_time = 0;
    this->mouse_idle_time = 0;
    this->mouse_idle_pos = _cursor.pos;
  }
 
  void OnRealtimeTick(uint delta_ms) override
  {
    /* Move the main game viewport according to intro viewport commands. */
 
    if (intro_viewport_commands.empty()) return;
 
    bool suppress_panning = true;
    if (this->mouse_idle_pos.x != _cursor.pos.x || this->mouse_idle_pos.y != _cursor.pos.y) {
      this->mouse_idle_pos = _cursor.pos;
      this->mouse_idle_time = 2000;
    } else if (this->mouse_idle_time > delta_ms) {
      this->mouse_idle_time -= delta_ms;
    } else {
      this->mouse_idle_time = 0;
      suppress_panning = false;
    }
 
    /* Determine whether to move to the next command or stay at current. */
    bool changed_command = false;
    if (this->cur_viewport_command_index >= intro_viewport_commands.size()) {
      /* Reached last, rotate back to start of the list. */
      this->cur_viewport_command_index = 0;
      changed_command = true;
    } else {
      /* Check if current command has elapsed and switch to next. */
      this->cur_viewport_command_time += delta_ms;
      if (this->cur_viewport_command_time >= intro_viewport_commands[this->cur_viewport_command_index].delay) {
        this->cur_viewport_command_index = (this->cur_viewport_command_index + 1) % intro_viewport_commands.size();
        this->cur_viewport_command_time = 0;
        changed_command = true;
      }
    }
 
    IntroGameViewportCommand &vc = intro_viewport_commands[this->cur_viewport_command_index];
    Window *mw = FindWindowByClass(WC_MAIN_WINDOW);
    Viewport *vp = mw->viewport;
 
    /* Early exit if the current command hasn't elapsed and isn't animated. */
    if (!changed_command && !vc.pan_to_next && vc.vehicle == INVALID_VEHICLE) return;
 
    /* Suppress panning commands, while user interacts with GUIs. */
    if (!changed_command && suppress_panning) return;
 
    /* Reset the zoom level. */
    if (changed_command) FixTitleGameZoom(vc.zoom_adjust);
 
    /* Calculate current command position (updates followed vehicle coordinates). */
    Point pos = vc.PositionForViewport(vp);
 
    /* Calculate panning (linear interpolation between current and next command position). */
    if (vc.pan_to_next) {
      size_t next_command_index = (this->cur_viewport_command_index + 1) % intro_viewport_commands.size();
      IntroGameViewportCommand &nvc = intro_viewport_commands[next_command_index];
      Point pos2 = nvc.PositionForViewport(vp);
      const double t = this->cur_viewport_command_time / (double)vc.delay;
      pos.x = pos.x + (int)(t * (pos2.x - pos.x));
      pos.y = pos.y + (int)(t * (pos2.y - pos.y));
    }
 
    /* Update the viewport position. */
    mw->viewport->dest_scrollpos_x = mw->viewport->scrollpos_x = pos.x;
    mw->viewport->dest_scrollpos_y = mw->viewport->scrollpos_y = pos.y;
    UpdateViewportPosition(mw);
    mw->SetDirty(); // Required during panning, otherwise logo graphics disappears
 
    /* If there is only one command, we just executed it and don't need to do any more */
    if (intro_viewport_commands.size() == 1 && vc.vehicle == INVALID_VEHICLE) intro_viewport_commands.clear();
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    if (!gui_scope) return;
    this->SetWidgetLoweredState(WID_SGI_TEMPERATE_LANDSCAPE, _settings_newgame.game_creation.landscape == LT_TEMPERATE);
    this->SetWidgetLoweredState(WID_SGI_ARCTIC_LANDSCAPE,    _settings_newgame.game_creation.landscape == LT_ARCTIC);
    this->SetWidgetLoweredState(WID_SGI_TROPIC_LANDSCAPE,    _settings_newgame.game_creation.landscape == LT_TROPIC);
    this->SetWidgetLoweredState(WID_SGI_TOYLAND_LANDSCAPE,   _settings_newgame.game_creation.landscape == LT_TOYLAND);
  }
 
  void OnInit() override
  {
    bool missing_sprites = _missing_extra_graphics > 0 && !IsReleasedVersion();
    this->GetWidget<NWidgetStacked>(WID_SGI_BASESET_SELECTION)->SetDisplayedPlane(missing_sprites ? 0 : SZSP_NONE);
 
    bool missing_lang = _current_language->missing >= _settings_client.gui.missing_strings_threshold && !IsReleasedVersion();
    this->GetWidget<NWidgetStacked>(WID_SGI_TRANSLATION_SELECTION)->SetDisplayedPlane(missing_lang ? 0 : SZSP_NONE);
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    switch (widget) {
      case WID_SGI_BASESET:
        SetDParam(0, _missing_extra_graphics);
        DrawStringMultiLine(r.left, r.right, r.top,  r.bottom, STR_INTRO_BASESET, TC_FROMSTRING, SA_CENTER);
        break;
 
      case WID_SGI_TRANSLATION:
        SetDParam(0, _current_language->missing);
        DrawStringMultiLine(r.left, r.right, r.top,  r.bottom, STR_INTRO_TRANSLATION, TC_FROMSTRING, SA_CENTER);
        break;
    }
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    StringID str = 0;
    switch (widget) {
      case WID_SGI_BASESET:
        SetDParam(0, _missing_extra_graphics);
        str = STR_INTRO_BASESET;
        break;
 
      case WID_SGI_TRANSLATION:
        SetDParam(0, _current_language->missing);
        str = STR_INTRO_TRANSLATION;
        break;
    }
 
    if (str != 0) {
      int height = GetStringHeight(str, size->width);
      if (height > 3 * FONT_HEIGHT_NORMAL) {
        /* Don't let the window become too high. */
        Dimension textdim = GetStringBoundingBox(str);
        textdim.height *= 3;
        textdim.width -= textdim.width / 2;
        *size = maxdim(*size, textdim);
      } else {
        size->height = height + padding.height;
      }
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    /* Do not create a network server when you (just) have closed one of the game
     * creation/load windows for the network server. */
    if (IsInsideMM(widget, WID_SGI_GENERATE_GAME, WID_SGI_EDIT_SCENARIO + 1)) _is_network_server = false;
 
    switch (widget) {
      case WID_SGI_GENERATE_GAME:
        if (_ctrl_pressed) {
          StartNewGameWithoutGUI(GENERATE_NEW_SEED);
        } else {
          ShowGenerateLandscape();
        }
        break;
 
      case WID_SGI_LOAD_GAME:      ShowSaveLoadDialog(FT_SAVEGAME, SLO_LOAD); break;
      case WID_SGI_PLAY_SCENARIO:  ShowSaveLoadDialog(FT_SCENARIO, SLO_LOAD); break;
      case WID_SGI_PLAY_HEIGHTMAP: ShowSaveLoadDialog(FT_HEIGHTMAP,SLO_LOAD); break;
      case WID_SGI_EDIT_SCENARIO:  StartScenarioEditor(); break;
 
      case WID_SGI_PLAY_NETWORK:
        if (!_network_available) {
          ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, WL_ERROR);
        } else {
          ShowNetworkGameWindow();
        }
        break;
 
      case WID_SGI_TEMPERATE_LANDSCAPE: case WID_SGI_ARCTIC_LANDSCAPE:
      case WID_SGI_TROPIC_LANDSCAPE: case WID_SGI_TOYLAND_LANDSCAPE:
        SetNewLandscapeType(widget - WID_SGI_TEMPERATE_LANDSCAPE);
        break;
 
      case WID_SGI_OPTIONS:         ShowGameOptions(); break;
      case WID_SGI_HIGHSCORE:       ShowHighscoreTable(); break;
      case WID_SGI_SETTINGS_OPTIONS:ShowGameSettings(); break;
      case WID_SGI_GRF_SETTINGS:    ShowNewGRFSettings(true, true, false, &_grfconfig_newgame); break;
      case WID_SGI_CONTENT_DOWNLOAD:
        if (!_network_available) {
          ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, WL_ERROR);
        } else {
          ShowNetworkContentListWindow();
        }
        break;
      case WID_SGI_AI_SETTINGS:     ShowAIConfigWindow(); break;
      case WID_SGI_GS_SETTINGS:     ShowGSConfigWindow(); break;
      case WID_SGI_EXIT:            HandleExitGameRequest(); break;
    }
  }
};
 
static const NWidgetPart _nested_select_game_widgets[] = {
  NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_INTRO_CAPTION, STR_NULL),
  NWidget(WWT_PANEL, COLOUR_BROWN),
  NWidget(NWID_SPACER), SetMinimalSize(0, 8),
 
  /* 'New Game' and 'Load Game' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_GENERATE_GAME), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_NEW_GAME, STR_INTRO_TOOLTIP_NEW_GAME), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_LOAD_GAME), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_LOAD_GAME, STR_INTRO_TOOLTIP_LOAD_GAME), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'Play Scenario' and 'Play Heightmap' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_PLAY_SCENARIO), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_PLAY_SCENARIO, STR_INTRO_TOOLTIP_PLAY_SCENARIO), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_PLAY_HEIGHTMAP), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_PLAY_HEIGHTMAP, STR_INTRO_TOOLTIP_PLAY_HEIGHTMAP), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'Scenario Editor' and 'Multiplayer' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_EDIT_SCENARIO), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_SCENARIO_EDITOR, STR_INTRO_TOOLTIP_SCENARIO_EDITOR), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_PLAY_NETWORK), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_MULTIPLAYER, STR_INTRO_TOOLTIP_MULTIPLAYER), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 7),
 
  /* Climate selection buttons */
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_SPACER), SetMinimalSize(10, 0), SetFill(1, 0),
    NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_SGI_TEMPERATE_LANDSCAPE), SetMinimalSize(77, 55),
              SetDataTip(SPR_SELECT_TEMPERATE, STR_INTRO_TOOLTIP_TEMPERATE),
    NWidget(NWID_SPACER), SetMinimalSize(3, 0), SetFill(1, 0),
    NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_SGI_ARCTIC_LANDSCAPE), SetMinimalSize(77, 55),
              SetDataTip(SPR_SELECT_SUB_ARCTIC, STR_INTRO_TOOLTIP_SUB_ARCTIC_LANDSCAPE),
    NWidget(NWID_SPACER), SetMinimalSize(3, 0), SetFill(1, 0),
    NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_SGI_TROPIC_LANDSCAPE), SetMinimalSize(77, 55),
              SetDataTip(SPR_SELECT_SUB_TROPICAL, STR_INTRO_TOOLTIP_SUB_TROPICAL_LANDSCAPE),
    NWidget(NWID_SPACER), SetMinimalSize(3, 0), SetFill(1, 0),
    NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_SGI_TOYLAND_LANDSCAPE), SetMinimalSize(77, 55),
              SetDataTip(SPR_SELECT_TOYLAND, STR_INTRO_TOOLTIP_TOYLAND_LANDSCAPE),
    NWidget(NWID_SPACER), SetMinimalSize(10, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 7),
  NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SGI_BASESET_SELECTION),
    NWidget(NWID_VERTICAL),
      NWidget(WWT_EMPTY, COLOUR_ORANGE, WID_SGI_BASESET), SetMinimalSize(316, 12), SetFill(1, 0), SetPadding(0, 10, 7, 10),
    EndContainer(),
  EndContainer(),
  NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SGI_TRANSLATION_SELECTION),
    NWidget(NWID_VERTICAL),
      NWidget(WWT_EMPTY, COLOUR_ORANGE, WID_SGI_TRANSLATION), SetMinimalSize(316, 12), SetFill(1, 0), SetPadding(0, 10, 7, 10),
    EndContainer(),
  EndContainer(),
 
  /* 'Game Options' and 'Settings' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_OPTIONS), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_GAME_OPTIONS, STR_INTRO_TOOLTIP_GAME_OPTIONS), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_SETTINGS_OPTIONS), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_CONFIG_SETTINGS_TREE, STR_INTRO_TOOLTIP_CONFIG_SETTINGS_TREE), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'AI Settings' and 'Game Script Settings' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_AI_SETTINGS), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_AI_SETTINGS, STR_INTRO_TOOLTIP_AI_SETTINGS), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_GS_SETTINGS), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_GAMESCRIPT_SETTINGS, STR_INTRO_TOOLTIP_GAMESCRIPT_SETTINGS), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'Check Online Content' and 'NewGRF Settings' buttons */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_CONTENT_DOWNLOAD), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT), SetPadding(0, 0, 0, 10), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_GRF_SETTINGS), SetMinimalSize(158, 12),
              SetDataTip(STR_INTRO_NEWGRF_SETTINGS, STR_INTRO_TOOLTIP_NEWGRF_SETTINGS), SetPadding(0, 10, 0, 0), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'Highscore Table' button */
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_HIGHSCORE), SetMinimalSize(316, 12),
              SetDataTip(STR_INTRO_HIGHSCORE, STR_INTRO_TOOLTIP_HIGHSCORE), SetPadding(0, 10, 0, 10), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 6),
 
  /* 'Exit' button */
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_SPACER), SetFill(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_EXIT), SetMinimalSize(128, 12),
              SetDataTip(STR_INTRO_QUIT, STR_INTRO_TOOLTIP_QUIT),
    NWidget(NWID_SPACER), SetFill(1, 0),
  EndContainer(),
 
  NWidget(NWID_SPACER), SetMinimalSize(0, 8),
 
  EndContainer(),
};
 
static WindowDesc _select_game_desc(
  WDP_CENTER, nullptr, 0, 0,
  WC_SELECT_GAME, WC_NONE,
  0,
  _nested_select_game_widgets, lengthof(_nested_select_game_widgets)
);
 
void ShowSelectGameWindow()
{
  new SelectGameWindow(&_select_game_desc);
}
 
static void AskExitGameCallback(Window *w, bool confirmed)
{
  if (confirmed) _exit_game = true;
}
 
void AskExitGame()
{
  ShowQuery(
    STR_QUIT_CAPTION,
    STR_QUIT_ARE_YOU_SURE_YOU_WANT_TO_EXIT_OPENTTD,
    nullptr,
    AskExitGameCallback
  );
}
 
 
static void AskExitToGameMenuCallback(Window *w, bool confirmed)
{
  if (confirmed) {
    _switch_mode = SM_MENU;
    ClearErrorMessages();
  }
}
 
void AskExitToGameMenu()
{
  ShowQuery(
    STR_ABANDON_GAME_CAPTION,
    (_game_mode != GM_EDITOR) ? STR_ABANDON_GAME_QUERY : STR_ABANDON_SCENARIO_QUERY,
    nullptr,
    AskExitToGameMenuCallback
  );
}