rail_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 "gui.h"
#include "window_gui.h"
#include "station_gui.h"
#include "terraform_gui.h"
#include "viewport_func.h"
#include "command_func.h"
#include "waypoint_func.h"
#include "newgrf_station.h"
#include "company_base.h"
#include "strings_func.h"
#include "window_func.h"
#include "date_func.h"
#include "sound_func.h"
#include "company_func.h"
#include "widgets/dropdown_type.h"
#include "tunnelbridge.h"
#include "tilehighlight_func.h"
#include "spritecache.h"
#include "core/geometry_func.hpp"
#include "hotkeys.h"
#include "engine_base.h"
#include "vehicle_func.h"
#include "zoom_func.h"
#include "rail_gui.h"
#include "querystring_gui.h"
#include "sortlist_type.h"
#include "stringfilter_type.h"
#include "string_func.h"
#include "station_cmd.h"
#include "tunnelbridge_cmd.h"
#include "waypoint_cmd.h"
#include "rail_cmd.h"
 
#include "station_map.h"
#include "tunnelbridge_map.h"
 
#include "widgets/rail_widget.h"
 
#include "safeguards.h"
 
 
static RailType _cur_railtype;               
static bool _remove_button_clicked;          
static DiagDirection _build_depot_direction; 
static byte _waypoint_count = 1;             
static byte _cur_waypoint_type;              
static bool _convert_signal_button;          
static SignalVariant _cur_signal_variant;    
static SignalType _cur_signal_type;          
 
struct RailStationGUISettings {
  Axis orientation;                 
 
  bool newstations;                 
  StationClassID station_class;     
  byte station_type;                
  byte station_count;               
};
static RailStationGUISettings _railstation; 
 
 
static void HandleStationPlacement(TileIndex start, TileIndex end);
static void ShowBuildTrainDepotPicker(Window *parent);
static void ShowBuildWaypointPicker(Window *parent);
static Window *ShowStationBuilder(Window *parent);
static void ShowSignalBuilder(Window *parent);
 
static bool IsStationAvailable(const StationSpec *statspec)
{
  if (statspec == nullptr || !HasBit(statspec->callback_mask, CBM_STATION_AVAIL)) return true;
 
  uint16 cb_res = GetStationCallback(CBID_STATION_AVAILABILITY, 0, 0, statspec, nullptr, INVALID_TILE);
  if (cb_res == CALLBACK_FAILED) return true;
 
  return Convert8bitBooleanCallback(statspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res);
}
 
void CcPlaySound_CONSTRUCTION_RAIL(Commands cmd, const CommandCost &result, TileIndex tile)
{
  if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
}
 
static void GenericPlaceRail(TileIndex tile, Track track)
{
  if (_remove_button_clicked) {
    Command<CMD_REMOVE_SINGLE_RAIL>::Post(STR_ERROR_CAN_T_REMOVE_RAILROAD_TRACK, CcPlaySound_CONSTRUCTION_RAIL,
        tile, track);
  } else {
    Command<CMD_BUILD_SINGLE_RAIL>::Post(STR_ERROR_CAN_T_BUILD_RAILROAD_TRACK, CcPlaySound_CONSTRUCTION_RAIL,
        tile, _cur_railtype, track, _settings_client.gui.auto_remove_signals);
  }
}
 
static void PlaceExtraDepotRail(TileIndex tile, DiagDirection dir, Track track)
{
  if (GetRailTileType(tile) == RAIL_TILE_DEPOT) return;
  if (GetRailTileType(tile) == RAIL_TILE_SIGNALS && !_settings_client.gui.auto_remove_signals) return;
  if ((GetTrackBits(tile) & DiagdirReachesTracks(dir)) == 0) return;
 
  Command<CMD_BUILD_SINGLE_RAIL>::Post(tile, _cur_railtype, track, _settings_client.gui.auto_remove_signals);
}
 
static const Track _place_depot_extra_track[12] = {
  TRACK_LEFT,  TRACK_UPPER, TRACK_UPPER, TRACK_RIGHT, // First additional track for directions 0..3
  TRACK_X,     TRACK_Y,     TRACK_X,     TRACK_Y,     // Second additional track
  TRACK_LOWER, TRACK_LEFT,  TRACK_RIGHT, TRACK_LOWER, // Third additional track
};
 
static const DiagDirection _place_depot_extra_dir[12] = {
  DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE, DIAGDIR_SW,
  DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_SE,
  DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_NW, DIAGDIR_NE,
};
 
void CcRailDepot(Commands cmd, const CommandCost &result, TileIndex tile, RailType rt, DiagDirection dir)
{
  if (result.Failed()) return;
 
  if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
  if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
 
  tile += TileOffsByDiagDir(dir);
 
  if (IsTileType(tile, MP_RAILWAY)) {
    PlaceExtraDepotRail(tile, _place_depot_extra_dir[dir], _place_depot_extra_track[dir]);
    PlaceExtraDepotRail(tile, _place_depot_extra_dir[dir + 4], _place_depot_extra_track[dir + 4]);
    PlaceExtraDepotRail(tile, _place_depot_extra_dir[dir + 8], _place_depot_extra_track[dir + 8]);
  }
}
 
static void PlaceRail_Waypoint(TileIndex tile)
{
  if (_remove_button_clicked) {
    VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_REMOVE_STATION);
    return;
  }
 
  Axis axis = GetAxisForNewWaypoint(tile);
  if (IsValidAxis(axis)) {
    /* Valid tile for waypoints */
    VpStartPlaceSizing(tile, axis == AXIS_X ? VPM_X_LIMITED : VPM_Y_LIMITED, DDSP_BUILD_STATION);
    VpSetPlaceSizingLimit(_settings_game.station.station_spread);
  } else {
    /* Tile where we can't build rail waypoints. This is always going to fail,
     * but provides the user with a proper error message. */
    Command<CMD_BUILD_RAIL_WAYPOINT>::Post(STR_ERROR_CAN_T_BUILD_TRAIN_WAYPOINT, tile, AXIS_X, 1, 1, STAT_CLASS_WAYP, 0, INVALID_STATION, false);
  }
}
 
void CcStation(Commands cmd, const CommandCost &result, TileIndex tile)
{
  if (result.Failed()) return;
 
  if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
  /* Only close the station builder window if the default station and non persistent building is chosen. */
  if (_railstation.station_class == STAT_CLASS_DFLT && _railstation.station_type == 0 && !_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
}
 
static void PlaceRail_Station(TileIndex tile)
{
  if (_remove_button_clicked) {
    VpStartPlaceSizing(tile, VPM_X_AND_Y_LIMITED, DDSP_REMOVE_STATION);
    VpSetPlaceSizingLimit(-1);
  } else if (_settings_client.gui.station_dragdrop) {
    VpStartPlaceSizing(tile, VPM_X_AND_Y_LIMITED, DDSP_BUILD_STATION);
    VpSetPlaceSizingLimit(_settings_game.station.station_spread);
  } else {
    int w = _settings_client.gui.station_numtracks;
    int h = _settings_client.gui.station_platlength;
    if (!_railstation.orientation) Swap(w, h);
 
    RailStationGUISettings params = _railstation;
    RailType rt = _cur_railtype;
    byte numtracks = _settings_client.gui.station_numtracks;
    byte platlength = _settings_client.gui.station_platlength;
    bool adjacent = _ctrl_pressed;
 
    auto proc = [=](bool test, StationID to_join) -> bool {
      if (test) {
        return Command<CMD_BUILD_RAIL_STATION>::Do(CommandFlagsToDCFlags(GetCommandFlags<CMD_BUILD_RAIL_STATION>()), tile, rt, params.orientation, numtracks, platlength, params.station_class, params.station_type, INVALID_STATION, adjacent).Succeeded();
      } else {
        return Command<CMD_BUILD_RAIL_STATION>::Post(STR_ERROR_CAN_T_BUILD_RAILROAD_STATION, CcStation, tile, rt, params.orientation, numtracks, platlength, params.station_class, params.station_type, to_join, adjacent);
      }
    };
 
    ShowSelectStationIfNeeded(TileArea(tile, w, h), proc);
  }
}
 
static void GenericPlaceSignals(TileIndex tile)
{
  TrackBits trackbits = TrackStatusToTrackBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0));
 
  if (trackbits & TRACK_BIT_VERT) { // N-S direction
    trackbits = (_tile_fract_coords.x <= _tile_fract_coords.y) ? TRACK_BIT_RIGHT : TRACK_BIT_LEFT;
  }
 
  if (trackbits & TRACK_BIT_HORZ) { // E-W direction
    trackbits = (_tile_fract_coords.x + _tile_fract_coords.y <= 15) ? TRACK_BIT_UPPER : TRACK_BIT_LOWER;
  }
 
  Track track = FindFirstTrack(trackbits);
 
  if (_remove_button_clicked) {
    Command<CMD_REMOVE_SIGNALS>::Post(STR_ERROR_CAN_T_REMOVE_SIGNALS_FROM, CcPlaySound_CONSTRUCTION_RAIL, tile, track);
  } else {
    /* Which signals should we cycle through? */
    SignalType cycle_start = _settings_client.gui.cycle_signal_types == SIGNAL_CYCLE_ALL && _settings_client.gui.signal_gui_mode == SIGNAL_GUI_ALL ? SIGTYPE_NORMAL : SIGTYPE_PBS;
 
    if (FindWindowById(WC_BUILD_SIGNAL, 0) != nullptr) {
      /* signal GUI is used */
      Command<CMD_BUILD_SIGNALS>::Post(_convert_signal_button ? STR_ERROR_SIGNAL_CAN_T_CONVERT_SIGNALS_HERE : STR_ERROR_CAN_T_BUILD_SIGNALS_HERE, CcPlaySound_CONSTRUCTION_RAIL,
        tile, track, _cur_signal_type, _cur_signal_variant, _convert_signal_button, false, _ctrl_pressed, cycle_start, SIGTYPE_LAST, 0, 0);
    } else {
      SignalVariant sigvar = _cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC;
      Command<CMD_BUILD_SIGNALS>::Post(STR_ERROR_CAN_T_BUILD_SIGNALS_HERE, CcPlaySound_CONSTRUCTION_RAIL,
        tile, track, _settings_client.gui.default_signal_type, sigvar, false, false, _ctrl_pressed, cycle_start, SIGTYPE_LAST, 0, 0);
 
    }
  }
}
 
static void PlaceRail_Bridge(TileIndex tile, Window *w)
{
  if (IsBridgeTile(tile)) {
    TileIndex other_tile = GetOtherTunnelBridgeEnd(tile);
    Point pt = {0, 0};
    w->OnPlaceMouseUp(VPM_X_OR_Y, DDSP_BUILD_BRIDGE, pt, other_tile, tile);
  } else {
    VpStartPlaceSizing(tile, VPM_X_OR_Y, DDSP_BUILD_BRIDGE);
  }
}
 
void CcBuildRailTunnel(Commands cmd, const CommandCost &result, TileIndex tile)
{
  if (result.Succeeded()) {
    if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
    if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
  } else {
    SetRedErrorSquare(_build_tunnel_endtile);
  }
}
 
static void ToggleRailButton_Remove(Window *w)
{
  CloseWindowById(WC_SELECT_STATION, 0);
  w->ToggleWidgetLoweredState(WID_RAT_REMOVE);
  w->SetWidgetDirty(WID_RAT_REMOVE);
  _remove_button_clicked = w->IsWidgetLowered(WID_RAT_REMOVE);
  SetSelectionRed(_remove_button_clicked);
}
 
static bool RailToolbar_CtrlChanged(Window *w)
{
  if (w->IsWidgetDisabled(WID_RAT_REMOVE)) return false;
 
  /* allow ctrl to switch remove mode only for these widgets */
  for (uint i = WID_RAT_BUILD_NS; i <= WID_RAT_BUILD_STATION; i++) {
    if ((i <= WID_RAT_AUTORAIL || i >= WID_RAT_BUILD_WAYPOINT) && w->IsWidgetLowered(i)) {
      ToggleRailButton_Remove(w);
      return true;
    }
  }
 
  return false;
}
 
 
static void BuildRailClick_Remove(Window *w)
{
  if (w->IsWidgetDisabled(WID_RAT_REMOVE)) return;
  ToggleRailButton_Remove(w);
  if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
 
  /* handle station builder */
  if (w->IsWidgetLowered(WID_RAT_BUILD_STATION)) {
    if (_remove_button_clicked) {
      /* starting drag & drop remove */
      if (!_settings_client.gui.station_dragdrop) {
        SetTileSelectSize(1, 1);
      } else {
        VpSetPlaceSizingLimit(-1);
      }
    } else {
      /* starting station build mode */
      if (!_settings_client.gui.station_dragdrop) {
        int x = _settings_client.gui.station_numtracks;
        int y = _settings_client.gui.station_platlength;
        if (_railstation.orientation == 0) Swap(x, y);
        SetTileSelectSize(x, y);
      } else {
        VpSetPlaceSizingLimit(_settings_game.station.station_spread);
      }
    }
  }
}
 
static void DoRailroadTrack(Track track)
{
  if (_remove_button_clicked) {
    Command<CMD_REMOVE_RAILROAD_TRACK>::Post(STR_ERROR_CAN_T_REMOVE_RAILROAD_TRACK, CcPlaySound_CONSTRUCTION_RAIL,
        TileVirtXY(_thd.selend.x, _thd.selend.y), TileVirtXY(_thd.selstart.x, _thd.selstart.y), track);
  } else {
    Command<CMD_BUILD_RAILROAD_TRACK>::Post(STR_ERROR_CAN_T_BUILD_RAILROAD_TRACK, CcPlaySound_CONSTRUCTION_RAIL,
        TileVirtXY(_thd.selend.x, _thd.selend.y), TileVirtXY(_thd.selstart.x, _thd.selstart.y),  _cur_railtype, track, _settings_client.gui.auto_remove_signals, false);
  }
}
 
static void HandleAutodirPlacement()
{
  Track trackstat = static_cast<Track>( _thd.drawstyle & HT_DIR_MASK); // 0..5
 
  if (_thd.drawstyle & HT_RAIL) { // one tile case
    GenericPlaceRail(TileVirtXY(_thd.selend.x, _thd.selend.y), trackstat);
    return;
  }
 
  DoRailroadTrack(trackstat);
}
 
static void HandleAutoSignalPlacement()
{
  Track track = (Track)GB(_thd.drawstyle, 0, 3); // 0..5
 
  if ((_thd.drawstyle & HT_DRAG_MASK) == HT_RECT) { // one tile case
    GenericPlaceSignals(TileVirtXY(_thd.selend.x, _thd.selend.y));
    return;
  }
 
  /* _settings_client.gui.drag_signals_density is given as a parameter such that each user
   * in a network game can specify their own signal density */
  if (_remove_button_clicked) {
    Command<CMD_REMOVE_SIGNAL_TRACK>::Post(STR_ERROR_CAN_T_REMOVE_SIGNALS_FROM, CcPlaySound_CONSTRUCTION_RAIL,
        TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y), track, _ctrl_pressed);
  } else {
    bool sig_gui = FindWindowById(WC_BUILD_SIGNAL, 0) != nullptr;
    SignalType sigtype = sig_gui ? _cur_signal_type : _settings_client.gui.default_signal_type;
    SignalVariant sigvar = sig_gui ? _cur_signal_variant : (_cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC);
    Command<CMD_BUILD_SIGNAL_TRACK>::Post(STR_ERROR_CAN_T_BUILD_SIGNALS_HERE, CcPlaySound_CONSTRUCTION_RAIL,
        TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y), track, sigtype, sigvar, false, _ctrl_pressed, !_settings_client.gui.drag_signals_fixed_distance, _settings_client.gui.drag_signals_density);
  }
}
 
 
struct BuildRailToolbarWindow : Window {
  RailType railtype;    
  int last_user_action; 
 
  BuildRailToolbarWindow(WindowDesc *desc, RailType railtype) : Window(desc)
  {
    this->InitNested(TRANSPORT_RAIL);
    this->SetupRailToolbar(railtype);
    this->DisableWidget(WID_RAT_REMOVE);
    this->last_user_action = WIDGET_LIST_END;
 
    if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
  }
 
  void Close() override
  {
    if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) SetViewportCatchmentStation(nullptr, true);
    if (_settings_client.gui.link_terraform_toolbar) CloseWindowById(WC_SCEN_LAND_GEN, 0, false);
    this->Window::Close();
  }
 
  void SetupRailToolbar(RailType railtype)
  {
    this->railtype = railtype;
    const RailtypeInfo *rti = GetRailTypeInfo(railtype);
 
    assert(railtype < RAILTYPE_END);
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_NS)->widget_data     = rti->gui_sprites.build_ns_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_X)->widget_data      = rti->gui_sprites.build_x_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_EW)->widget_data     = rti->gui_sprites.build_ew_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_Y)->widget_data      = rti->gui_sprites.build_y_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_AUTORAIL)->widget_data     = rti->gui_sprites.auto_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_DEPOT)->widget_data  = rti->gui_sprites.build_depot;
    this->GetWidget<NWidgetCore>(WID_RAT_CONVERT_RAIL)->widget_data = rti->gui_sprites.convert_rail;
    this->GetWidget<NWidgetCore>(WID_RAT_BUILD_TUNNEL)->widget_data = rti->gui_sprites.build_tunnel;
  }
 
  void ModifyRailType(RailType railtype)
  {
    this->SetupRailToolbar(railtype);
    this->ReInit();
  }
 
  void UpdateRemoveWidgetStatus(int clicked_widget)
  {
    switch (clicked_widget) {
      case WID_RAT_REMOVE:
        /* If it is the removal button that has been clicked, do nothing,
         * as it is up to the other buttons to drive removal status */
        return;
 
      case WID_RAT_BUILD_NS:
      case WID_RAT_BUILD_X:
      case WID_RAT_BUILD_EW:
      case WID_RAT_BUILD_Y:
      case WID_RAT_AUTORAIL:
      case WID_RAT_BUILD_WAYPOINT:
      case WID_RAT_BUILD_STATION:
      case WID_RAT_BUILD_SIGNALS:
        /* Removal button is enabled only if the rail/signal/waypoint/station
         * button is still lowered.  Once raised, it has to be disabled */
        this->SetWidgetDisabledState(WID_RAT_REMOVE, !this->IsWidgetLowered(clicked_widget));
        break;
 
      default:
        /* When any other buttons than rail/signal/waypoint/station, raise and
         * disable the removal button */
        this->DisableWidget(WID_RAT_REMOVE);
        this->RaiseWidget(WID_RAT_REMOVE);
        break;
    }
  }
 
  void SetStringParameters(int widget) const override
  {
    if (widget == WID_RAT_CAPTION) {
      const RailtypeInfo *rti = GetRailTypeInfo(this->railtype);
      if (rti->max_speed > 0) {
        SetDParam(0, STR_TOOLBAR_RAILTYPE_VELOCITY);
        SetDParam(1, rti->strings.toolbar_caption);
        SetDParam(2, rti->max_speed);
      } else {
        SetDParam(0, rti->strings.toolbar_caption);
      }
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    if (widget < WID_RAT_BUILD_NS) return;
 
    _remove_button_clicked = false;
    switch (widget) {
      case WID_RAT_BUILD_NS:
        HandlePlacePushButton(this, WID_RAT_BUILD_NS, GetRailTypeInfo(_cur_railtype)->cursor.rail_ns, HT_LINE | HT_DIR_VL);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_BUILD_X:
        HandlePlacePushButton(this, WID_RAT_BUILD_X, GetRailTypeInfo(_cur_railtype)->cursor.rail_swne, HT_LINE | HT_DIR_X);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_BUILD_EW:
        HandlePlacePushButton(this, WID_RAT_BUILD_EW, GetRailTypeInfo(_cur_railtype)->cursor.rail_ew, HT_LINE | HT_DIR_HL);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_BUILD_Y:
        HandlePlacePushButton(this, WID_RAT_BUILD_Y, GetRailTypeInfo(_cur_railtype)->cursor.rail_nwse, HT_LINE | HT_DIR_Y);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_AUTORAIL:
        HandlePlacePushButton(this, WID_RAT_AUTORAIL, GetRailTypeInfo(_cur_railtype)->cursor.autorail, HT_RAIL);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_DEMOLISH:
        HandlePlacePushButton(this, WID_RAT_DEMOLISH, ANIMCURSOR_DEMOLISH, HT_RECT | HT_DIAGONAL);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_BUILD_DEPOT:
        if (HandlePlacePushButton(this, WID_RAT_BUILD_DEPOT, GetRailTypeInfo(_cur_railtype)->cursor.depot, HT_RECT)) {
          ShowBuildTrainDepotPicker(this);
          this->last_user_action = widget;
        }
        break;
 
      case WID_RAT_BUILD_WAYPOINT:
        this->last_user_action = widget;
        _waypoint_count = StationClass::Get(STAT_CLASS_WAYP)->GetSpecCount();
        if (HandlePlacePushButton(this, WID_RAT_BUILD_WAYPOINT, SPR_CURSOR_WAYPOINT, HT_RECT) && _waypoint_count > 1) {
          ShowBuildWaypointPicker(this);
        }
        break;
 
      case WID_RAT_BUILD_STATION:
        if (HandlePlacePushButton(this, WID_RAT_BUILD_STATION, SPR_CURSOR_RAIL_STATION, HT_RECT)) {
          ShowStationBuilder(this);
          this->last_user_action = widget;
        }
        break;
 
      case WID_RAT_BUILD_SIGNALS: {
        this->last_user_action = widget;
        bool started = HandlePlacePushButton(this, WID_RAT_BUILD_SIGNALS, ANIMCURSOR_BUILDSIGNALS, HT_RECT);
        if (started != _ctrl_pressed) {
          ShowSignalBuilder(this);
        }
        break;
      }
 
      case WID_RAT_BUILD_BRIDGE:
        HandlePlacePushButton(this, WID_RAT_BUILD_BRIDGE, SPR_CURSOR_BRIDGE, HT_RECT);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_BUILD_TUNNEL:
        HandlePlacePushButton(this, WID_RAT_BUILD_TUNNEL, GetRailTypeInfo(_cur_railtype)->cursor.tunnel, HT_SPECIAL);
        this->last_user_action = widget;
        break;
 
      case WID_RAT_REMOVE:
        BuildRailClick_Remove(this);
        break;
 
      case WID_RAT_CONVERT_RAIL:
        HandlePlacePushButton(this, WID_RAT_CONVERT_RAIL, GetRailTypeInfo(_cur_railtype)->cursor.convert, HT_RECT | HT_DIAGONAL);
        this->last_user_action = widget;
        break;
 
      default: NOT_REACHED();
    }
    this->UpdateRemoveWidgetStatus(widget);
    if (_ctrl_pressed) RailToolbar_CtrlChanged(this);
  }
 
  EventState OnHotkey(int hotkey) override
  {
    MarkTileDirtyByTile(TileVirtXY(_thd.pos.x, _thd.pos.y)); // redraw tile selection
    return Window::OnHotkey(hotkey);
  }
 
  void OnPlaceObject(Point pt, TileIndex tile) override
  {
    switch (this->last_user_action) {
      case WID_RAT_BUILD_NS:
        VpStartPlaceSizing(tile, VPM_FIX_VERTICAL | VPM_RAILDIRS, DDSP_PLACE_RAIL);
        break;
 
      case WID_RAT_BUILD_X:
        VpStartPlaceSizing(tile, VPM_FIX_Y | VPM_RAILDIRS, DDSP_PLACE_RAIL);
        break;
 
      case WID_RAT_BUILD_EW:
        VpStartPlaceSizing(tile, VPM_FIX_HORIZONTAL | VPM_RAILDIRS, DDSP_PLACE_RAIL);
        break;
 
      case WID_RAT_BUILD_Y:
        VpStartPlaceSizing(tile, VPM_FIX_X | VPM_RAILDIRS, DDSP_PLACE_RAIL);
        break;
 
      case WID_RAT_AUTORAIL:
        VpStartPlaceSizing(tile, VPM_RAILDIRS, DDSP_PLACE_RAIL);
        break;
 
      case WID_RAT_DEMOLISH:
        PlaceProc_DemolishArea(tile);
        break;
 
      case WID_RAT_BUILD_DEPOT:
        Command<CMD_BUILD_TRAIN_DEPOT>::Post(STR_ERROR_CAN_T_BUILD_TRAIN_DEPOT, CcRailDepot, tile, _cur_railtype, _build_depot_direction);
        break;
 
      case WID_RAT_BUILD_WAYPOINT:
        PlaceRail_Waypoint(tile);
        break;
 
      case WID_RAT_BUILD_STATION:
        PlaceRail_Station(tile);
        break;
 
      case WID_RAT_BUILD_SIGNALS:
        VpStartPlaceSizing(tile, VPM_SIGNALDIRS, DDSP_BUILD_SIGNALS);
        break;
 
      case WID_RAT_BUILD_BRIDGE:
        PlaceRail_Bridge(tile, this);
        break;
 
      case WID_RAT_BUILD_TUNNEL:
        Command<CMD_BUILD_TUNNEL>::Post(STR_ERROR_CAN_T_BUILD_TUNNEL_HERE, CcBuildRailTunnel, tile, TRANSPORT_RAIL, _cur_railtype);
        break;
 
      case WID_RAT_CONVERT_RAIL:
        VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_CONVERT_RAIL);
        break;
 
      default: NOT_REACHED();
    }
  }
 
  void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
  {
    /* no dragging if you have pressed the convert button */
    if (FindWindowById(WC_BUILD_SIGNAL, 0) != nullptr && _convert_signal_button && this->IsWidgetLowered(WID_RAT_BUILD_SIGNALS)) return;
 
    VpSelectTilesWithMethod(pt.x, pt.y, select_method);
  }
 
  void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
  {
    if (pt.x != -1) {
      switch (select_proc) {
        default: NOT_REACHED();
        case DDSP_BUILD_BRIDGE:
          if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
          ShowBuildBridgeWindow(start_tile, end_tile, TRANSPORT_RAIL, _cur_railtype);
          break;
 
        case DDSP_PLACE_RAIL:
          HandleAutodirPlacement();
          break;
 
        case DDSP_BUILD_SIGNALS:
          HandleAutoSignalPlacement();
          break;
 
        case DDSP_DEMOLISH_AREA:
          GUIPlaceProcDragXY(select_proc, start_tile, end_tile);
          break;
 
        case DDSP_CONVERT_RAIL:
          Command<CMD_CONVERT_RAIL>::Post(STR_ERROR_CAN_T_CONVERT_RAIL, CcPlaySound_CONSTRUCTION_RAIL, end_tile, start_tile, _cur_railtype, _ctrl_pressed);
          break;
 
        case DDSP_REMOVE_STATION:
        case DDSP_BUILD_STATION:
          if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) {
            /* Station */
            if (_remove_button_clicked) {
              bool keep_rail = !_ctrl_pressed;
              Command<CMD_REMOVE_FROM_RAIL_STATION>::Post(STR_ERROR_CAN_T_REMOVE_PART_OF_STATION, CcPlaySound_CONSTRUCTION_RAIL, end_tile, start_tile, keep_rail);
            } else {
              HandleStationPlacement(start_tile, end_tile);
            }
          } else {
            /* Waypoint */
            if (_remove_button_clicked) {
              bool keep_rail = !_ctrl_pressed;
              Command<CMD_REMOVE_FROM_RAIL_WAYPOINT>::Post(STR_ERROR_CAN_T_REMOVE_TRAIN_WAYPOINT, CcPlaySound_CONSTRUCTION_RAIL, end_tile, start_tile, keep_rail);
            } else {
              TileArea ta(start_tile, end_tile);
              Axis axis = select_method == VPM_X_LIMITED ? AXIS_X : AXIS_Y;
              bool adjacent = _ctrl_pressed;
              byte waypoint_type = _cur_waypoint_type;
 
              auto proc = [=](bool test, StationID to_join) -> bool {
                if (test) {
                  return Command<CMD_BUILD_RAIL_WAYPOINT>::Do(CommandFlagsToDCFlags(GetCommandFlags<CMD_BUILD_RAIL_WAYPOINT>()), ta.tile, axis, ta.w, ta.h, STAT_CLASS_WAYP, waypoint_type, INVALID_STATION, adjacent).Succeeded();
                } else {
                  return Command<CMD_BUILD_RAIL_WAYPOINT>::Post(STR_ERROR_CAN_T_BUILD_TRAIN_WAYPOINT, CcPlaySound_CONSTRUCTION_RAIL, ta.tile, axis, ta.w, ta.h, STAT_CLASS_WAYP, waypoint_type, to_join, adjacent);
                }
              };
 
              ShowSelectWaypointIfNeeded(ta, proc);
            }
          }
          break;
      }
    }
  }
 
  void OnPlaceObjectAbort() override
  {
    if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) SetViewportCatchmentStation(nullptr, true);
 
    this->RaiseButtons();
    this->DisableWidget(WID_RAT_REMOVE);
    this->SetWidgetDirty(WID_RAT_REMOVE);
 
    CloseWindowById(WC_BUILD_SIGNAL, TRANSPORT_RAIL);
    CloseWindowById(WC_BUILD_STATION, TRANSPORT_RAIL);
    CloseWindowById(WC_BUILD_DEPOT, TRANSPORT_RAIL);
    CloseWindowById(WC_BUILD_WAYPOINT, TRANSPORT_RAIL);
    CloseWindowById(WC_SELECT_STATION, 0);
    CloseWindowByClass(WC_BUILD_BRIDGE);
  }
 
  void OnPlacePresize(Point pt, TileIndex tile) override
  {
    Command<CMD_BUILD_TUNNEL>::Do(DC_AUTO, tile, TRANSPORT_RAIL, _cur_railtype);
    VpSetPresizeRange(tile, _build_tunnel_endtile == 0 ? tile : _build_tunnel_endtile);
  }
 
  EventState OnCTRLStateChange() override
  {
    /* do not toggle Remove button by Ctrl when placing station */
    if (!this->IsWidgetLowered(WID_RAT_BUILD_STATION) && !this->IsWidgetLowered(WID_RAT_BUILD_WAYPOINT) && RailToolbar_CtrlChanged(this)) return ES_HANDLED;
    return ES_NOT_HANDLED;
  }
 
  static HotkeyList hotkeys;
};
 
static EventState RailToolbarGlobalHotkeys(int hotkey)
{
  if (_game_mode != GM_NORMAL) return ES_NOT_HANDLED;
  extern RailType _last_built_railtype;
  Window *w = ShowBuildRailToolbar(_last_built_railtype);
  if (w == nullptr) return ES_NOT_HANDLED;
  return w->OnHotkey(hotkey);
}
 
const uint16 _railtoolbar_autorail_keys[] = {'5', 'A' | WKC_GLOBAL_HOTKEY, 0};
 
static Hotkey railtoolbar_hotkeys[] = {
  Hotkey('1', "build_ns", WID_RAT_BUILD_NS),
  Hotkey('2', "build_x", WID_RAT_BUILD_X),
  Hotkey('3', "build_ew", WID_RAT_BUILD_EW),
  Hotkey('4', "build_y", WID_RAT_BUILD_Y),
  Hotkey(_railtoolbar_autorail_keys, "autorail", WID_RAT_AUTORAIL),
  Hotkey('6', "demolish", WID_RAT_DEMOLISH),
  Hotkey('7', "depot", WID_RAT_BUILD_DEPOT),
  Hotkey('8', "waypoint", WID_RAT_BUILD_WAYPOINT),
  Hotkey('9', "station", WID_RAT_BUILD_STATION),
  Hotkey('S', "signal", WID_RAT_BUILD_SIGNALS),
  Hotkey('B', "bridge", WID_RAT_BUILD_BRIDGE),
  Hotkey('T', "tunnel", WID_RAT_BUILD_TUNNEL),
  Hotkey('R', "remove", WID_RAT_REMOVE),
  Hotkey('C', "convert", WID_RAT_CONVERT_RAIL),
  HOTKEY_LIST_END
};
HotkeyList BuildRailToolbarWindow::hotkeys("railtoolbar", railtoolbar_hotkeys, RailToolbarGlobalHotkeys);
 
static const NWidgetPart _nested_build_rail_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN, WID_RAT_CAPTION), SetDataTip(STR_WHITE_STRING, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_NS),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_RAIL_NS, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_TRACK),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_X),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_RAIL_NE, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_TRACK),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_EW),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_RAIL_EW, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_TRACK),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_Y),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_RAIL_NW, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_TRACK),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_AUTORAIL),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_AUTORAIL, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_AUTORAIL),
 
    NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetMinimalSize(4, 22), EndContainer(),
 
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_DEMOLISH),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_DEPOT),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DEPOT_RAIL, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_TRAIN_DEPOT_FOR_BUILDING),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_WAYPOINT),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_WAYPOINT, STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL_TO_WAYPOINT),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_STATION),
            SetFill(0, 1), SetMinimalSize(42, 22), SetDataTip(SPR_IMG_RAIL_STATION, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_STATION),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_SIGNALS),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_RAIL_SIGNALS, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_SIGNALS),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_BRIDGE),
            SetFill(0, 1), SetMinimalSize(42, 22), SetDataTip(SPR_IMG_BRIDGE, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_BRIDGE),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_BUILD_TUNNEL),
            SetFill(0, 1), SetMinimalSize(20, 22), SetDataTip(SPR_IMG_TUNNEL_RAIL, STR_RAIL_TOOLBAR_TOOLTIP_BUILD_RAILROAD_TUNNEL),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_REMOVE),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_REMOVE, STR_RAIL_TOOLBAR_TOOLTIP_TOGGLE_BUILD_REMOVE_FOR),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_RAT_CONVERT_RAIL),
            SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_CONVERT_RAIL, STR_RAIL_TOOLBAR_TOOLTIP_CONVERT_RAIL),
  EndContainer(),
};
 
static WindowDesc _build_rail_desc(
  WDP_ALIGN_TOOLBAR, "toolbar_rail", 0, 0,
  WC_BUILD_TOOLBAR, WC_NONE,
  WDF_CONSTRUCTION,
  _nested_build_rail_widgets, lengthof(_nested_build_rail_widgets),
  &BuildRailToolbarWindow::hotkeys
);
 
 
Window *ShowBuildRailToolbar(RailType railtype)
{
  if (!Company::IsValidID(_local_company)) return nullptr;
  if (!ValParamRailtype(railtype)) return nullptr;
 
  CloseWindowByClass(WC_BUILD_TOOLBAR);
  _cur_railtype = railtype;
  _remove_button_clicked = false;
  return new BuildRailToolbarWindow(&_build_rail_desc, railtype);
}
 
/* TODO: For custom stations, respect their allowed platforms/lengths bitmasks!
 * --pasky */
 
static void HandleStationPlacement(TileIndex start, TileIndex end)
{
  TileArea ta(start, end);
  uint numtracks = ta.w;
  uint platlength = ta.h;
 
  if (_railstation.orientation == AXIS_X) Swap(numtracks, platlength);
 
  RailStationGUISettings params = _railstation;
  RailType rt = _cur_railtype;
  bool adjacent = _ctrl_pressed;
 
  auto proc = [=](bool test, StationID to_join) -> bool {
    if (test) {
      return Command<CMD_BUILD_RAIL_STATION>::Do(CommandFlagsToDCFlags(GetCommandFlags<CMD_BUILD_RAIL_STATION>()), ta.tile, rt, params.orientation, numtracks, platlength, params.station_class, params.station_type, INVALID_STATION, adjacent).Succeeded();
    } else {
      return Command<CMD_BUILD_RAIL_STATION>::Post(STR_ERROR_CAN_T_BUILD_RAILROAD_STATION, CcStation, ta.tile, rt, params.orientation, numtracks, platlength, params.station_class, params.station_type, to_join, adjacent);
    }
  };
 
  ShowSelectStationIfNeeded(ta, proc);
}
 
enum BuildRalStationHotkeys {
  BRASHK_FOCUS_FILTER_BOX, 
};
 
struct BuildRailStationWindow : public PickerWindowBase {
private:
  uint line_height;     
  uint coverage_height; 
  Scrollbar *vscroll;   
  Scrollbar *vscroll2;  
 
  typedef GUIList<StationClassID, StringFilter &> GUIStationClassList; 
 
  static const uint EDITBOX_MAX_SIZE = 16; 
 
  static Listing   last_sorting;           
  static Filtering last_filtering;         
  static GUIStationClassList::SortFunction * const sorter_funcs[];   
  static GUIStationClassList::FilterFunction * const filter_funcs[]; 
  GUIStationClassList station_classes;     
  StringFilter string_filter;              
  QueryString filter_editbox;              
 
  void EnsureSelectedStationClassIsVisible()
  {
    uint pos = 0;
    for (auto station_class : this->station_classes) {
      if (station_class == _railstation.station_class) break;
      pos++;
    }
    this->vscroll->SetCount((int)this->station_classes.size());
    this->vscroll->ScrollTowards(pos);
  }
 
  void CheckSelectedSize(const StationSpec *statspec)
  {
    if (statspec == nullptr || _settings_client.gui.station_dragdrop) return;
 
    /* If current number of tracks is not allowed, make it as big as possible */
    if (HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
      this->RaiseWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
      _settings_client.gui.station_numtracks = 1;
      if (statspec->disallowed_platforms != UINT8_MAX) {
        while (HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
          _settings_client.gui.station_numtracks++;
        }
        this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
      }
    }
 
    if (HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
      this->RaiseWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
      _settings_client.gui.station_platlength = 1;
      if (statspec->disallowed_lengths != UINT8_MAX) {
        while (HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
          _settings_client.gui.station_platlength++;
        }
        this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
      }
    }
  }
 
public:
  BuildRailStationWindow(WindowDesc *desc, Window *parent, bool newstation) : PickerWindowBase(desc, parent), filter_editbox(EDITBOX_MAX_SIZE * MAX_CHAR_LENGTH, EDITBOX_MAX_SIZE)
  {
    this->coverage_height = 2 * FONT_HEIGHT_NORMAL + 3 * WidgetDimensions::scaled.vsep_normal;
    this->vscroll = nullptr;
    _railstation.newstations = newstation;
 
    this->CreateNestedTree();
    NWidgetStacked *newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_ADDITIONS);
    newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
    newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_MATRIX);
    newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
    newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_DEFSIZE);
    newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
    newst_additions = this->GetWidget<NWidgetStacked>(WID_BRAS_SHOW_NEWST_RESIZE);
    newst_additions->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
    /* Hide the station class filter if no stations other than the default one are available. */
    this->GetWidget<NWidgetStacked>(WID_BRAS_FILTER_CONTAINER)->SetDisplayedPlane(newstation ? 0 : SZSP_NONE);
    if (newstation) {
      this->vscroll = this->GetScrollbar(WID_BRAS_NEWST_SCROLL);
      this->vscroll2 = this->GetScrollbar(WID_BRAS_MATRIX_SCROLL);
 
      this->querystrings[WID_BRAS_FILTER_EDITBOX] = &this->filter_editbox;
      this->station_classes.SetListing(this->last_sorting);
      this->station_classes.SetFiltering(this->last_filtering);
      this->station_classes.SetSortFuncs(this->sorter_funcs);
      this->station_classes.SetFilterFuncs(this->filter_funcs);
    }
 
    this->station_classes.ForceRebuild();
 
    BuildStationClassesAvailable();
    SelectClassAndStation();
 
    this->FinishInitNested(TRANSPORT_RAIL);
 
    this->LowerWidget(_railstation.orientation + WID_BRAS_PLATFORM_DIR_X);
    if (_settings_client.gui.station_dragdrop) {
      this->LowerWidget(WID_BRAS_PLATFORM_DRAG_N_DROP);
    } else {
      this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
      this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
    }
    this->SetWidgetLoweredState(WID_BRAS_HIGHLIGHT_OFF, !_settings_client.gui.station_show_coverage);
    this->SetWidgetLoweredState(WID_BRAS_HIGHLIGHT_ON, _settings_client.gui.station_show_coverage);
 
    if (!newstation) {
      _railstation.station_class = StationClassID::STAT_CLASS_DFLT;
      _railstation.station_type = 0;
      this->vscroll2 = nullptr;
    } else {
      _railstation.station_count = StationClass::Get(_railstation.station_class)->GetSpecCount();
      _railstation.station_type = std::min<int>(_railstation.station_type, _railstation.station_count - 1);
 
      NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BRAS_MATRIX);
      matrix->SetScrollbar(this->vscroll2);
      matrix->SetCount(_railstation.station_count);
      matrix->SetClicked(_railstation.station_type);
 
      EnsureSelectedStationClassIsVisible();
    }
 
    this->InvalidateData();
  }
 
  void Close() override
  {
    CloseWindowById(WC_SELECT_STATION, 0);
    this->PickerWindowBase::Close();
  }
 
  static bool StationClassIDSorter(StationClassID const &a, StationClassID const &b)
  {
    return a < b;
  }
 
  static bool CDECL TagNameFilter(StationClassID const * sc, StringFilter &filter)
  {
    char buffer[DRAW_STRING_BUFFER];
    GetString(buffer, StationClass::Get(*sc)->name, lastof(buffer));
 
    filter.ResetState();
    filter.AddLine(buffer);
    return filter.GetState();
  }
 
  void BuildStationClassesAvailable()
  {
    if (!this->station_classes.NeedRebuild()) return;
 
    this->station_classes.clear();
 
    for (uint i = 0; i < StationClass::GetClassCount(); i++) {
      StationClassID station_class_id = (StationClassID)i;
      if (station_class_id == StationClassID::STAT_CLASS_WAYP) {
        // Skip waypoints.
        continue;
      }
      StationClass *station_class = StationClass::Get(station_class_id);
      if (station_class->GetUISpecCount() == 0) continue;
      station_classes.push_back(station_class_id);
    }
 
    if (_railstation.newstations) {
      this->station_classes.Filter(this->string_filter);
      this->station_classes.shrink_to_fit();
      this->station_classes.RebuildDone();
      this->station_classes.Sort();
 
      this->vscroll->SetCount((uint)this->station_classes.size());
    }
  }
 
  void SelectClassAndStation()
  {
    if (_railstation.station_class == StationClassID::STAT_CLASS_DFLT) {
      /* This happens during the first time the window is open during the game life cycle. */
      this->SelectOtherClass(StationClassID::STAT_CLASS_DFLT);
    } else {
      /* Check if the previously selected station class is not available anymore as a
       * result of starting a new game without the corresponding NewGRF. */
      bool available = false;
      for (uint i = 0; i < StationClass::GetClassCount(); ++i) {
        if ((StationClassID)i == _railstation.station_class) {
          available = true;
          break;
        }
      }
 
      this->SelectOtherClass(available ? _railstation.station_class : StationClassID::STAT_CLASS_DFLT);
    }
  }
 
  void SelectOtherClass(StationClassID station_class)
  {
    _railstation.station_class = station_class;
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    if (!gui_scope) return;
 
    this->BuildStationClassesAvailable();
  }
 
  EventState OnHotkey(int hotkey) override
  {
    switch (hotkey) {
      case BRASHK_FOCUS_FILTER_BOX:
        this->SetFocusedWidget(WID_BRAS_FILTER_EDITBOX);
        SetFocusedWindow(this); // The user has asked to give focus to the text box, so make sure this window is focused.
        break;
 
      default:
        return ES_NOT_HANDLED;
    }
 
    return ES_HANDLED;
  }
 
  void OnEditboxChanged(int wid) override
  {
    string_filter.SetFilterTerm(this->filter_editbox.text.buf);
    this->station_classes.SetFilterState(!string_filter.IsEmpty());
    this->station_classes.ForceRebuild();
    this->InvalidateData();
  }
 
  void OnPaint() override
  {
    bool newstations = _railstation.newstations;
    const StationSpec *statspec = newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
 
    if (_settings_client.gui.station_dragdrop) {
      SetTileSelectSize(1, 1);
    } else {
      int x = _settings_client.gui.station_numtracks;
      int y = _settings_client.gui.station_platlength;
      if (_railstation.orientation == AXIS_X) Swap(x, y);
      if (!_remove_button_clicked) {
        SetTileSelectSize(x, y);
      }
    }
 
    int rad = (_settings_game.station.modified_catchment) ? CA_TRAIN : CA_UNMODIFIED;
 
    if (_settings_client.gui.station_show_coverage) SetTileSelectBigSize(-rad, -rad, 2 * rad, 2 * rad);
 
    for (uint bits = 0; bits < 7; bits++) {
      bool disable = bits >= _settings_game.station.station_spread;
      if (statspec == nullptr) {
        this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_NUM_1, disable);
        this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_LEN_1, disable);
      } else {
        this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_NUM_1, HasBit(statspec->disallowed_platforms, bits) || disable);
        this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_LEN_1, HasBit(statspec->disallowed_lengths,   bits) || disable);
      }
    }
 
    this->DrawWidgets();
 
    if (this->IsShaded()) return;
    /* 'Accepts' and 'Supplies' texts. */
    Rect r = this->GetWidget<NWidgetBase>(WID_BRAS_COVERAGE_TEXTS)->GetCurrentRect();
    int top = r.top + WidgetDimensions::scaled.vsep_normal;
    top = DrawStationCoverageAreaText(r.left, r.right, top, SCT_ALL, rad, false) + WidgetDimensions::scaled.vsep_normal;
    top = DrawStationCoverageAreaText(r.left, r.right, top, SCT_ALL, rad, true) + WidgetDimensions::scaled.vsep_normal;
    /* Resize background if the window is too small.
     * Never make the window smaller to avoid oscillating if the size change affects the acceptance.
     * (This is the case, if making the window bigger moves the mouse into the window.) */
    if (top > r.bottom) {
      this->coverage_height += top - r.bottom;
      this->ReInit();
    }
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    switch (widget) {
      case WID_BRAS_NEWST_LIST: {
        Dimension d = {0, 0};
        for (auto station_class : this->station_classes) {
          d = maxdim(d, GetStringBoundingBox(StationClass::Get(station_class)->name));
        }
        size->width = std::max(size->width, d.width + padding.width);
        this->line_height = FONT_HEIGHT_NORMAL + padding.height;
        size->height = 5 * this->line_height;
        resize->height = this->line_height;
        break;
      }
 
      case WID_BRAS_SHOW_NEWST_TYPE: {
        if (!_railstation.newstations) {
          size->width = 0;
          size->height = 0;
          break;
        }
 
        /* If newstations exist, compute the non-zero minimal size. */
        Dimension d = {0, 0};
        StringID str = this->GetWidget<NWidgetCore>(widget)->widget_data;
        for (auto station_class : this->station_classes) {
          StationClass *stclass = StationClass::Get(station_class);
          for (uint j = 0; j < stclass->GetSpecCount(); j++) {
            const StationSpec *statspec = stclass->GetSpec(j);
            SetDParam(0, (statspec != nullptr && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
            d = maxdim(d, GetStringBoundingBox(str));
          }
        }
        size->width = std::max(size->width, d.width + padding.width);
        break;
      }
 
      case WID_BRAS_PLATFORM_DIR_X:
      case WID_BRAS_PLATFORM_DIR_Y:
      case WID_BRAS_IMAGE:
        size->width  = ScaleGUITrad(64) + WidgetDimensions::scaled.fullbevel.Horizontal();
        size->height = ScaleGUITrad(58) + WidgetDimensions::scaled.fullbevel.Vertical();
        break;
 
      case WID_BRAS_COVERAGE_TEXTS:
        size->height = this->coverage_height;
        break;
 
      case WID_BRAS_MATRIX:
        fill->height = 1;
        resize->height = 1;
        break;
    }
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    DrawPixelInfo tmp_dpi;
 
    switch (GB(widget, 0, 16)) {
      case WID_BRAS_PLATFORM_DIR_X:
        /* Set up a clipping area for the '/' station preview */
        if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.Width(), r.Height())) {
          DrawPixelInfo *old_dpi = _cur_dpi;
          _cur_dpi = &tmp_dpi;
          int x = (r.Width()  - ScaleSpriteTrad(64)) / 2 + ScaleSpriteTrad(31);
          int y = (r.Height() + ScaleSpriteTrad(58)) / 2 - ScaleSpriteTrad(31);
          if (!DrawStationTile(x, y, _cur_railtype, AXIS_X, _railstation.station_class, _railstation.station_type)) {
            StationPickerDrawSprite(x, y, STATION_RAIL, _cur_railtype, INVALID_ROADTYPE, 2);
          }
          _cur_dpi = old_dpi;
        }
        break;
 
      case WID_BRAS_PLATFORM_DIR_Y:
        /* Set up a clipping area for the '\' station preview */
        if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.Width(), r.Height())) {
          DrawPixelInfo *old_dpi = _cur_dpi;
          _cur_dpi = &tmp_dpi;
          int x = (r.Width()  - ScaleSpriteTrad(64)) / 2 + ScaleSpriteTrad(31);
          int y = (r.Height() + ScaleSpriteTrad(58)) / 2 - ScaleSpriteTrad(31);
          if (!DrawStationTile(x, y, _cur_railtype, AXIS_Y, _railstation.station_class, _railstation.station_type)) {
            StationPickerDrawSprite(x, y, STATION_RAIL, _cur_railtype, INVALID_ROADTYPE, 3);
          }
          _cur_dpi = old_dpi;
        }
        break;
 
      case WID_BRAS_NEWST_LIST: {
        Rect ir = r.Shrink(WidgetDimensions::scaled.matrix);
        uint statclass = 0;
        for (auto station_class : this->station_classes) {
          if (this->vscroll->IsVisible(statclass)) {
            DrawString(ir,
                StationClass::Get(station_class)->name,
                station_class == _railstation.station_class ? TC_WHITE : TC_BLACK);
            ir.top += this->line_height;
          }
          statclass++;
        }
        break;
      }
 
      case WID_BRAS_IMAGE: {
        byte type = GB(widget, 16, 16);
        assert(type < _railstation.station_count);
        /* Check station availability callback */
        const StationSpec *statspec = StationClass::Get(_railstation.station_class)->GetSpec(type);
        if (!IsStationAvailable(statspec)) {
          GfxFillRect(r.Shrink(WidgetDimensions::scaled.bevel), PC_BLACK, FILLRECT_CHECKER);
        }
 
        /* Set up a clipping area for the station preview. */
        if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.Width(), r.Height())) {
          DrawPixelInfo *old_dpi = _cur_dpi;
          _cur_dpi = &tmp_dpi;
          int x = (r.Width()  - ScaleSpriteTrad(64)) / 2 + ScaleSpriteTrad(31);
          int y = (r.Height() + ScaleSpriteTrad(58)) / 2 - ScaleSpriteTrad(31);
          if (!DrawStationTile(x, y, _cur_railtype, _railstation.orientation, _railstation.station_class, type)) {
            StationPickerDrawSprite(x, y, STATION_RAIL, _cur_railtype, INVALID_ROADTYPE, 2 + _railstation.orientation);
          }
          _cur_dpi = old_dpi;
        }
        break;
      }
    }
  }
 
  void OnResize() override
  {
    if (this->vscroll != nullptr) { // New stations available.
      this->vscroll->SetCapacityFromWidget(this, WID_BRAS_NEWST_LIST);
    }
  }
 
  void SetStringParameters(int widget) const override
  {
    if (widget == WID_BRAS_SHOW_NEWST_TYPE) {
      const StationSpec *statspec = StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type);
      SetDParam(0, (statspec != nullptr && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (GB(widget, 0, 16)) {
      case WID_BRAS_PLATFORM_DIR_X:
      case WID_BRAS_PLATFORM_DIR_Y:
        this->RaiseWidget(_railstation.orientation + WID_BRAS_PLATFORM_DIR_X);
        _railstation.orientation = (Axis)(widget - WID_BRAS_PLATFORM_DIR_X);
        this->LowerWidget(_railstation.orientation + WID_BRAS_PLATFORM_DIR_X);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
 
      case WID_BRAS_PLATFORM_NUM_1:
      case WID_BRAS_PLATFORM_NUM_2:
      case WID_BRAS_PLATFORM_NUM_3:
      case WID_BRAS_PLATFORM_NUM_4:
      case WID_BRAS_PLATFORM_NUM_5:
      case WID_BRAS_PLATFORM_NUM_6:
      case WID_BRAS_PLATFORM_NUM_7: {
        this->RaiseWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
        this->RaiseWidget(WID_BRAS_PLATFORM_DRAG_N_DROP);
 
        _settings_client.gui.station_numtracks = widget - WID_BRAS_PLATFORM_NUM_BEGIN;
        _settings_client.gui.station_dragdrop = false;
 
        _settings_client.gui.station_dragdrop = false;
 
        const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
        if (statspec != nullptr && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
          /* The previously selected number of platforms in invalid */
          for (uint i = 0; i < 7; i++) {
            if (!HasBit(statspec->disallowed_lengths, i)) {
              this->RaiseWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
              _settings_client.gui.station_platlength = i + 1;
              break;
            }
          }
        }
 
        this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
        this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
      }
 
      case WID_BRAS_PLATFORM_LEN_1:
      case WID_BRAS_PLATFORM_LEN_2:
      case WID_BRAS_PLATFORM_LEN_3:
      case WID_BRAS_PLATFORM_LEN_4:
      case WID_BRAS_PLATFORM_LEN_5:
      case WID_BRAS_PLATFORM_LEN_6:
      case WID_BRAS_PLATFORM_LEN_7: {
        this->RaiseWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
        this->RaiseWidget(WID_BRAS_PLATFORM_DRAG_N_DROP);
 
        _settings_client.gui.station_platlength = widget - WID_BRAS_PLATFORM_LEN_BEGIN;
        _settings_client.gui.station_dragdrop = false;
 
        _settings_client.gui.station_dragdrop = false;
 
        const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
        if (statspec != nullptr && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
          /* The previously selected number of tracks in invalid */
          for (uint i = 0; i < 7; i++) {
            if (!HasBit(statspec->disallowed_platforms, i)) {
              this->RaiseWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
              _settings_client.gui.station_numtracks = i + 1;
              break;
            }
          }
        }
 
        this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
        this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
      }
 
      case WID_BRAS_PLATFORM_DRAG_N_DROP: {
        _settings_client.gui.station_dragdrop ^= true;
 
        this->ToggleWidgetLoweredState(WID_BRAS_PLATFORM_DRAG_N_DROP);
 
        /* get the first allowed length/number of platforms */
        const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
        if (statspec != nullptr && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
          for (uint i = 0; i < 7; i++) {
            if (!HasBit(statspec->disallowed_lengths, i)) {
              this->RaiseWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
              _settings_client.gui.station_platlength = i + 1;
              break;
            }
          }
        }
        if (statspec != nullptr && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
          for (uint i = 0; i < 7; i++) {
            if (!HasBit(statspec->disallowed_platforms, i)) {
              this->RaiseWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
              _settings_client.gui.station_numtracks = i + 1;
              break;
            }
          }
        }
 
        this->SetWidgetLoweredState(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN, !_settings_client.gui.station_dragdrop);
        this->SetWidgetLoweredState(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN, !_settings_client.gui.station_dragdrop);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
      }
 
      case WID_BRAS_HIGHLIGHT_OFF:
      case WID_BRAS_HIGHLIGHT_ON:
        _settings_client.gui.station_show_coverage = (widget != WID_BRAS_HIGHLIGHT_OFF);
 
        this->SetWidgetLoweredState(WID_BRAS_HIGHLIGHT_OFF, !_settings_client.gui.station_show_coverage);
        this->SetWidgetLoweredState(WID_BRAS_HIGHLIGHT_ON, _settings_client.gui.station_show_coverage);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        SetViewportCatchmentStation(nullptr, true);
        break;
 
      case WID_BRAS_NEWST_LIST: {
        int y = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_BRAS_NEWST_LIST);
        if (y >= (int)this->station_classes.size()) return;
        StationClassID station_class_id = this->station_classes[y];
        if (_railstation.station_class != station_class_id) {
          StationClass *station_class = StationClass::Get(station_class_id);
          _railstation.station_class = station_class_id;
          _railstation.station_count = station_class->GetSpecCount();
          _railstation.station_type  = 0;
 
          this->CheckSelectedSize(station_class->GetSpec(_railstation.station_type));
 
          NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BRAS_MATRIX);
          matrix->SetCount(_railstation.station_count);
          matrix->SetClicked(_railstation.station_type);
        }
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
      }
 
      case WID_BRAS_IMAGE: {
        int y = GB(widget, 16, 16);
        if (y >= _railstation.station_count) return;
 
        /* Check station availability callback */
        const StationSpec *statspec = StationClass::Get(_railstation.station_class)->GetSpec(y);
        if (!IsStationAvailable(statspec)) return;
 
        _railstation.station_type = y;
 
        this->CheckSelectedSize(statspec);
        this->GetWidget<NWidgetMatrix>(WID_BRAS_MATRIX)->SetClicked(_railstation.station_type);
 
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        CloseWindowById(WC_SELECT_STATION, 0);
        break;
      }
    }
  }
 
  void OnRealtimeTick(uint delta_ms) override
  {
    CheckRedrawStationCoverage(this);
  }
 
  static HotkeyList hotkeys;
};
 
static EventState BuildRailStationGlobalHotkeys(int hotkey)
{
  if (_game_mode == GM_MENU) return ES_NOT_HANDLED;
  Window *w = ShowStationBuilder(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
  if (w == nullptr) return ES_NOT_HANDLED;
  return w->OnHotkey(hotkey);
}
 
static Hotkey buildrailstation_hotkeys[] = {
  Hotkey('F', "focus_filter_box", BRASHK_FOCUS_FILTER_BOX),
  HOTKEY_LIST_END
};
HotkeyList BuildRailStationWindow::hotkeys("buildrailstation", buildrailstation_hotkeys, BuildRailStationGlobalHotkeys);
 
Listing BuildRailStationWindow::last_sorting = { false, 0 };
Filtering BuildRailStationWindow::last_filtering = { false, 0 };
 
BuildRailStationWindow::GUIStationClassList::SortFunction * const BuildRailStationWindow::sorter_funcs[] = {
  &StationClassIDSorter,
};
 
BuildRailStationWindow::GUIStationClassList::FilterFunction * const BuildRailStationWindow::filter_funcs[] = {
  &TagNameFilter,
};
 
static const NWidgetPart _nested_station_builder_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_STATION_BUILD_RAIL_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_DEFSIZE),
      NWidget(WWT_DEFSIZEBOX, COLOUR_DARK_GREEN),
    EndContainer(),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
    NWidget(NWID_HORIZONTAL), SetPadding(2, 0, 0, 2),
      NWidget(NWID_VERTICAL),
        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_FILTER_CONTAINER),
          NWidget(NWID_HORIZONTAL), SetPadding(0, 5, 2, 0),
            NWidget(WWT_TEXT, COLOUR_DARK_GREEN), SetFill(0, 1), SetDataTip(STR_LIST_FILTER_TITLE, STR_NULL),
            NWidget(WWT_EDITBOX, COLOUR_GREY, WID_BRAS_FILTER_EDITBOX), SetFill(1, 0), SetResize(1, 0),
                SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
          EndContainer(),
        EndContainer(),
        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_ADDITIONS),
          NWidget(NWID_HORIZONTAL), SetPadding(0, 5, 2, 0),
            NWidget(WWT_MATRIX, COLOUR_GREY, WID_BRAS_NEWST_LIST), SetMinimalSize(122, 71), SetFill(1, 0),
                SetMatrixDataTip(1, 0, STR_STATION_BUILD_STATION_CLASS_TOOLTIP), SetScrollbar(WID_BRAS_NEWST_SCROLL),
            NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_BRAS_NEWST_SCROLL),
          EndContainer(),
        EndContainer(),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(144, 11), SetDataTip(STR_STATION_BUILD_ORIENTATION, STR_NULL), SetPadding(1, 2, 0, 0),
        NWidget(NWID_HORIZONTAL),
          NWidget(NWID_SPACER), SetMinimalSize(7, 0), SetFill(1, 0),
          NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAS_PLATFORM_DIR_X), SetMinimalSize(66, 60), SetFill(0, 0), SetDataTip(0x0, STR_STATION_BUILD_RAILROAD_ORIENTATION_TOOLTIP), EndContainer(),
          NWidget(NWID_SPACER), SetMinimalSize(2, 0), SetFill(1, 0),
          NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAS_PLATFORM_DIR_Y), SetMinimalSize(66, 60), SetFill(0, 0), SetDataTip(0x0, STR_STATION_BUILD_RAILROAD_ORIENTATION_TOOLTIP), EndContainer(),
          NWidget(NWID_SPACER), SetMinimalSize(7, 0), SetFill(1, 0),
        EndContainer(),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN, WID_BRAS_SHOW_NEWST_TYPE), SetMinimalSize(144, 11), SetDataTip(STR_ORANGE_STRING, STR_NULL), SetPadding(1, 2, 4, 2),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(144, 11), SetDataTip(STR_STATION_BUILD_NUMBER_OF_TRACKS, STR_NULL), SetPadding(0, 2, 0, 2),
        NWidget(NWID_HORIZONTAL),
          NWidget(NWID_SPACER), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_1), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_1, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_2), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_2, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_3), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_3, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_4), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_4, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_5), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_5, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_6), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_6, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_NUM_7), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_7, STR_STATION_BUILD_NUMBER_OF_TRACKS_TOOLTIP),
          NWidget(NWID_SPACER), SetFill(1, 0),
        EndContainer(),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(144, 11), SetDataTip(STR_STATION_BUILD_PLATFORM_LENGTH, STR_NULL), SetPadding(2, 2, 0, 2),
        NWidget(NWID_HORIZONTAL),
          NWidget(NWID_SPACER), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_1), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_1, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_2), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_2, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_3), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_3, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_4), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_4, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_5), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_5, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_6), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_6, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_LEN_7), SetMinimalSize(15, 12), SetDataTip(STR_BLACK_7, STR_STATION_BUILD_PLATFORM_LENGTH_TOOLTIP),
          NWidget(NWID_SPACER), SetFill(1, 0),
        EndContainer(),
        NWidget(NWID_SPACER), SetMinimalSize(0, 2),
        NWidget(NWID_HORIZONTAL),
          NWidget(NWID_SPACER), SetMinimalSize(2, 0), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_PLATFORM_DRAG_N_DROP), SetMinimalSize(75, 12), SetDataTip(STR_STATION_BUILD_DRAG_DROP, STR_STATION_BUILD_DRAG_DROP_TOOLTIP),
          NWidget(NWID_SPACER), SetMinimalSize(2, 0), SetFill(1, 0),
        EndContainer(),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetDataTip(STR_STATION_BUILD_COVERAGE_AREA_TITLE, STR_NULL), SetPadding(WidgetDimensions::unscaled.framerect), SetFill(1, 0),
        NWidget(NWID_HORIZONTAL),
          NWidget(NWID_SPACER), SetMinimalSize(2, 0), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_HIGHLIGHT_OFF), SetMinimalSize(60, 12),
                        SetDataTip(STR_STATION_BUILD_COVERAGE_OFF, STR_STATION_BUILD_COVERAGE_AREA_OFF_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BRAS_HIGHLIGHT_ON), SetMinimalSize(60, 12),
                        SetDataTip(STR_STATION_BUILD_COVERAGE_ON, STR_STATION_BUILD_COVERAGE_AREA_ON_TOOLTIP),
          NWidget(NWID_SPACER), SetMinimalSize(2, 0), SetFill(1, 0),
        EndContainer(),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_MATRIX),
        /* We need an additional background for the matrix, as the matrix cannot handle the scrollbar due to not being an NWidgetCore. */
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BRAS_MATRIX_SCROLL),
          NWidget(NWID_HORIZONTAL),
            NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BRAS_MATRIX), SetScrollbar(WID_BRAS_MATRIX_SCROLL), SetPIP(0, 2, 0),
              NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BRAS_IMAGE), SetMinimalSize(66, 60),
                  SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BRAS_MATRIX_SCROLL),
              EndContainer(),
            EndContainer(),
            NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_BRAS_MATRIX_SCROLL),
          EndContainer(),
        EndContainer(),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_BRAS_COVERAGE_TEXTS), SetPadding(WidgetDimensions::unscaled.framerect), SetFill(1, 1), SetResize(1, 0),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_RESIZE),
        NWidget(NWID_VERTICAL),
          NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetFill(0, 1), EndContainer(),
          NWidget(WWT_RESIZEBOX, COLOUR_DARK_GREEN),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _station_builder_desc(
  WDP_AUTO, "build_station_rail", 350, 0,
  WC_BUILD_STATION, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_station_builder_widgets, lengthof(_nested_station_builder_widgets),
  &BuildRailStationWindow::hotkeys
);
 
static Window *ShowStationBuilder(Window *parent)
{
  bool newstations = StationClass::GetClassCount() > 2 || StationClass::Get(STAT_CLASS_DFLT)->GetSpecCount() != 1;
  return new BuildRailStationWindow(&_station_builder_desc, parent, newstations);
}
 
struct BuildSignalWindow : public PickerWindowBase {
private:
  Dimension sig_sprite_size;     
  int sig_sprite_bottom_offset;  
 
  void DrawSignalSprite(const Rect &r, int widget_index, SpriteID image) const
  {
    Point offset;
    Dimension sprite_size = GetSpriteSize(image, &offset);
    Rect ir = r.Shrink(WidgetDimensions::scaled.imgbtn);
    int x = CenterBounds(ir.left, ir.right, sprite_size.width - offset.x) - offset.x; // centered
    int y = ir.top - sig_sprite_bottom_offset +
        (ir.Height() + sig_sprite_size.height) / 2; // aligned to bottom
 
    DrawSprite(image, PAL_NONE,
        x + this->IsWidgetLowered(widget_index),
        y + this->IsWidgetLowered(widget_index));
  }
 
  void SetSignalUIMode()
  {
    bool show_non_path_signals = (_settings_client.gui.signal_gui_mode == SIGNAL_GUI_ALL);
 
    this->GetWidget<NWidgetStacked>(WID_BS_SEMAPHORE_NORM_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_ELECTRIC_NORM_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_SEMAPHORE_ENTRY_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_ELECTRIC_ENTRY_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_SEMAPHORE_EXIT_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_ELECTRIC_EXIT_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_SEMAPHORE_COMBO_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
    this->GetWidget<NWidgetStacked>(WID_BS_ELECTRIC_COMBO_SEL)->SetDisplayedPlane(show_non_path_signals ? 0 : SZSP_NONE);
  }
 
public:
  BuildSignalWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
  {
    this->CreateNestedTree();
    this->SetSignalUIMode();
    this->FinishInitNested(TRANSPORT_RAIL);
    this->OnInvalidateData();
  }
 
  void Close() override
  {
    _convert_signal_button = false;
    this->PickerWindowBase::Close();
  }
 
  void OnInit() override
  {
    /* Calculate maximum signal sprite size. */
    this->sig_sprite_size.width = 0;
    this->sig_sprite_size.height = 0;
    this->sig_sprite_bottom_offset = 0;
    const RailtypeInfo *rti = GetRailTypeInfo(_cur_railtype);
    for (uint type = SIGTYPE_NORMAL; type < SIGTYPE_END; type++) {
      for (uint variant = SIG_ELECTRIC; variant <= SIG_SEMAPHORE; variant++) {
        for (uint lowered = 0; lowered < 2; lowered++) {
          Point offset;
          Dimension sprite_size = GetSpriteSize(rti->gui_sprites.signals[type][variant][lowered], &offset);
          this->sig_sprite_bottom_offset = std::max<int>(this->sig_sprite_bottom_offset, sprite_size.height);
          this->sig_sprite_size.width = std::max<int>(this->sig_sprite_size.width, sprite_size.width - offset.x);
          this->sig_sprite_size.height = std::max<int>(this->sig_sprite_size.height, sprite_size.height - offset.y);
        }
      }
    }
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    if (widget == WID_BS_DRAG_SIGNALS_DENSITY_LABEL) {
      /* Two digits for signals density. */
      size->width = std::max(size->width, 2 * GetDigitWidth() + padding.width + WidgetDimensions::scaled.framerect.Horizontal());
    } else if (IsInsideMM(widget, WID_BS_SEMAPHORE_NORM, WID_BS_ELECTRIC_PBS_OWAY + 1)) {
      size->width = std::max(size->width, this->sig_sprite_size.width + padding.width);
      size->height = std::max(size->height, this->sig_sprite_size.height + padding.height);
    } else if (widget == WID_BS_CAPTION) {
      size->width += WidgetDimensions::scaled.frametext.Horizontal();
    }
  }
 
  void SetStringParameters(int widget) const override
  {
    switch (widget) {
      case WID_BS_DRAG_SIGNALS_DENSITY_LABEL:
        SetDParam(0, _settings_client.gui.drag_signals_density);
        break;
    }
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    if (IsInsideMM(widget, WID_BS_SEMAPHORE_NORM, WID_BS_ELECTRIC_PBS_OWAY + 1)) {
      /* Extract signal from widget number. */
      int type = (widget - WID_BS_SEMAPHORE_NORM) % SIGTYPE_END;
      int var = SIG_SEMAPHORE - (widget - WID_BS_SEMAPHORE_NORM) / SIGTYPE_END; // SignalVariant order is reversed compared to the widgets.
      SpriteID sprite = GetRailTypeInfo(_cur_railtype)->gui_sprites.signals[type][var][this->IsWidgetLowered(widget)];
 
      this->DrawSignalSprite(r, widget, sprite);
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (widget) {
      case WID_BS_SEMAPHORE_NORM:
      case WID_BS_SEMAPHORE_ENTRY:
      case WID_BS_SEMAPHORE_EXIT:
      case WID_BS_SEMAPHORE_COMBO:
      case WID_BS_SEMAPHORE_PBS:
      case WID_BS_SEMAPHORE_PBS_OWAY:
      case WID_BS_ELECTRIC_NORM:
      case WID_BS_ELECTRIC_ENTRY:
      case WID_BS_ELECTRIC_EXIT:
      case WID_BS_ELECTRIC_COMBO:
      case WID_BS_ELECTRIC_PBS:
      case WID_BS_ELECTRIC_PBS_OWAY:
        this->RaiseWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);
 
        _cur_signal_type = (SignalType)((uint)((widget - WID_BS_SEMAPHORE_NORM) % (SIGTYPE_LAST + 1)));
        _cur_signal_variant = widget >= WID_BS_ELECTRIC_NORM ? SIG_ELECTRIC : SIG_SEMAPHORE;
 
        /* Update default (last-used) signal type in config file. */
        _settings_client.gui.default_signal_type = _cur_signal_type;
 
        /* If 'remove' button of rail build toolbar is active, disable it. */
        if (_remove_button_clicked) {
          Window *w = FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL);
          if (w != nullptr) ToggleRailButton_Remove(w);
        }
 
        break;
 
      case WID_BS_CONVERT:
        _convert_signal_button = !_convert_signal_button;
        break;
 
      case WID_BS_DRAG_SIGNALS_DENSITY_DECREASE:
        if (_settings_client.gui.drag_signals_density > 1) {
          _settings_client.gui.drag_signals_density--;
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_SETTINGS);
        }
        break;
 
      case WID_BS_DRAG_SIGNALS_DENSITY_INCREASE:
        if (_settings_client.gui.drag_signals_density < 20) {
          _settings_client.gui.drag_signals_density++;
          SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_SETTINGS);
        }
        break;
 
      case WID_BS_TOGGLE_SIZE:
        _settings_client.gui.signal_gui_mode = (_settings_client.gui.signal_gui_mode == SIGNAL_GUI_ALL) ? SIGNAL_GUI_PATH : SIGNAL_GUI_ALL;
        this->SetSignalUIMode();
        this->ReInit();
        break;
 
      default: break;
    }
 
    this->InvalidateData();
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    if (!gui_scope) return;
    this->LowerWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);
 
    this->SetWidgetLoweredState(WID_BS_CONVERT, _convert_signal_button);
 
    this->SetWidgetDisabledState(WID_BS_DRAG_SIGNALS_DENSITY_DECREASE, _settings_client.gui.drag_signals_density == 1);
    this->SetWidgetDisabledState(WID_BS_DRAG_SIGNALS_DENSITY_INCREASE, _settings_client.gui.drag_signals_density == 20);
  }
};
 
static const NWidgetPart _nested_signal_builder_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN, WID_BS_CAPTION), SetDataTip(STR_BUILD_SIGNAL_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_BS_TOGGLE_SIZE), SetDataTip(SPR_LARGE_SMALL_WINDOW, STR_BUILD_SIGNAL_TOGGLE_ADVANCED_SIGNAL_TOOLTIP),
  EndContainer(),
  NWidget(NWID_VERTICAL, NC_EQUALSIZE),
    NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_SEMAPHORE_NORM_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_NORM), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_NORM_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_SEMAPHORE_ENTRY_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_ENTRY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_ENTRY_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_SEMAPHORE_EXIT_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_EXIT), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_EXIT_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_SEMAPHORE_COMBO_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_COMBO), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_COMBO_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_PBS), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_PBS_TOOLTIP), EndContainer(), SetFill(1, 1),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_PBS_OWAY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_PBS_OWAY_TOOLTIP), EndContainer(), SetFill(1, 1),
      NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_BS_CONVERT), SetDataTip(SPR_IMG_SIGNAL_CONVERT, STR_BUILD_SIGNAL_CONVERT_TOOLTIP), SetFill(1, 1),
    EndContainer(),
    NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_ELECTRIC_NORM_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_NORM), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_NORM_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_ELECTRIC_ENTRY_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_ENTRY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_ENTRY_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_ELECTRIC_EXIT_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_EXIT), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_EXIT_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BS_ELECTRIC_COMBO_SEL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_COMBO), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_COMBO_TOOLTIP), EndContainer(), SetFill(1, 1),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_PBS), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_PBS_TOOLTIP), EndContainer(), SetFill(1, 1),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_PBS_OWAY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_PBS_OWAY_TOOLTIP), EndContainer(), SetFill(1, 1),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_DRAG_SIGNALS_DENSITY_TOOLTIP), SetFill(1, 1),
        NWidget(WWT_LABEL, COLOUR_DARK_GREEN, WID_BS_DRAG_SIGNALS_DENSITY_LABEL), SetDataTip(STR_ORANGE_INT, STR_BUILD_SIGNAL_DRAG_SIGNALS_DENSITY_TOOLTIP), SetFill(1, 1),
        NWidget(NWID_HORIZONTAL), SetPIP(2, 0, 2),
          NWidget(NWID_SPACER), SetFill(1, 0),
          NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_BS_DRAG_SIGNALS_DENSITY_DECREASE), SetMinimalSize(9, 12), SetDataTip(AWV_DECREASE, STR_BUILD_SIGNAL_DRAG_SIGNALS_DENSITY_DECREASE_TOOLTIP),
          NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_BS_DRAG_SIGNALS_DENSITY_INCREASE), SetMinimalSize(9, 12), SetDataTip(AWV_INCREASE, STR_BUILD_SIGNAL_DRAG_SIGNALS_DENSITY_INCREASE_TOOLTIP),
          NWidget(NWID_SPACER), SetFill(1, 0),
        EndContainer(),
        NWidget(NWID_SPACER), SetMinimalSize(0, 2), SetFill(1, 0),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _signal_builder_desc(
  WDP_AUTO, "build_signal", 0, 0,
  WC_BUILD_SIGNAL, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_signal_builder_widgets, lengthof(_nested_signal_builder_widgets)
);
 
static void ShowSignalBuilder(Window *parent)
{
  new BuildSignalWindow(&_signal_builder_desc, parent);
}
 
struct BuildRailDepotWindow : public PickerWindowBase {
  BuildRailDepotWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
  {
    this->InitNested(TRANSPORT_RAIL);
    this->LowerWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    if (!IsInsideMM(widget, WID_BRAD_DEPOT_NE, WID_BRAD_DEPOT_NW + 1)) return;
 
    size->width  = ScaleGUITrad(64) + WidgetDimensions::scaled.fullbevel.Horizontal();
    size->height = ScaleGUITrad(48) + WidgetDimensions::scaled.fullbevel.Vertical();
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    if (!IsInsideMM(widget, WID_BRAD_DEPOT_NE, WID_BRAD_DEPOT_NW + 1)) return;
 
    DrawPixelInfo tmp_dpi;
    if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.Width(), r.Height())) {
      DrawPixelInfo *old_dpi = _cur_dpi;
      _cur_dpi = &tmp_dpi;
      int x = (r.Width()  - ScaleSpriteTrad(64)) / 2 + ScaleSpriteTrad(31);
      int y = (r.Height() + ScaleSpriteTrad(48)) / 2 - ScaleSpriteTrad(31);
      DrawTrainDepotSprite(x, y, widget - WID_BRAD_DEPOT_NE + DIAGDIR_NE, _cur_railtype);
      _cur_dpi = old_dpi;
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (widget) {
      case WID_BRAD_DEPOT_NE:
      case WID_BRAD_DEPOT_SE:
      case WID_BRAD_DEPOT_SW:
      case WID_BRAD_DEPOT_NW:
        this->RaiseWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
        _build_depot_direction = (DiagDirection)(widget - WID_BRAD_DEPOT_NE);
        this->LowerWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        break;
    }
  }
};
 
static const NWidgetPart _nested_build_depot_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_BUILD_DEPOT_TRAIN_ORIENTATION_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
    NWidget(NWID_SPACER), SetMinimalSize(0, 3),
    NWidget(NWID_HORIZONTAL_LTR),
      NWidget(NWID_SPACER), SetMinimalSize(3, 0), SetFill(1, 0),
      NWidget(NWID_VERTICAL),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAD_DEPOT_NW), SetMinimalSize(66, 50), SetDataTip(0x0, STR_BUILD_DEPOT_TRAIN_ORIENTATION_TOOLTIP),
        EndContainer(),
        NWidget(NWID_SPACER), SetMinimalSize(0, 2),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAD_DEPOT_SW), SetMinimalSize(66, 50), SetDataTip(0x0, STR_BUILD_DEPOT_TRAIN_ORIENTATION_TOOLTIP),
        EndContainer(),
      EndContainer(),
      NWidget(NWID_SPACER), SetMinimalSize(2, 0),
      NWidget(NWID_VERTICAL),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAD_DEPOT_NE), SetMinimalSize(66, 50), SetDataTip(0x0, STR_BUILD_DEPOT_TRAIN_ORIENTATION_TOOLTIP),
        EndContainer(),
        NWidget(NWID_SPACER), SetMinimalSize(0, 2),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_BRAD_DEPOT_SE), SetMinimalSize(66, 50), SetDataTip(0x0, STR_BUILD_DEPOT_TRAIN_ORIENTATION_TOOLTIP),
        EndContainer(),
      EndContainer(),
      NWidget(NWID_SPACER), SetMinimalSize(3, 0), SetFill(1, 0),
    EndContainer(),
    NWidget(NWID_SPACER), SetMinimalSize(0, 3),
  EndContainer(),
};
 
static WindowDesc _build_depot_desc(
  WDP_AUTO, nullptr, 0, 0,
  WC_BUILD_DEPOT, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_build_depot_widgets, lengthof(_nested_build_depot_widgets)
);
 
static void ShowBuildTrainDepotPicker(Window *parent)
{
  new BuildRailDepotWindow(&_build_depot_desc, parent);
}
 
struct BuildRailWaypointWindow : PickerWindowBase {
  BuildRailWaypointWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
  {
    this->CreateNestedTree();
 
    NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BRW_WAYPOINT_MATRIX);
    matrix->SetScrollbar(this->GetScrollbar(WID_BRW_SCROLL));
 
    this->FinishInitNested(TRANSPORT_RAIL);
 
    matrix->SetCount(_waypoint_count);
    if (_cur_waypoint_type >= _waypoint_count) _cur_waypoint_type = 0;
    matrix->SetClicked(_cur_waypoint_type);
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    switch (widget) {
      case WID_BRW_WAYPOINT_MATRIX:
        /* Three blobs high and wide. */
        size->width  += resize->width  * 2;
        size->height += resize->height * 2;
 
        /* Resizing in X direction only at blob size, but at pixel level in Y. */
        resize->height = 1;
        break;
 
      case WID_BRW_WAYPOINT:
        size->width  = ScaleGUITrad(64) + WidgetDimensions::scaled.fullbevel.Horizontal();
        size->height = ScaleGUITrad(58) + WidgetDimensions::scaled.fullbevel.Vertical();
        break;
    }
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    switch (GB(widget, 0, 16)) {
      case WID_BRW_WAYPOINT: {
        byte type = GB(widget, 16, 16);
        const StationSpec *statspec = StationClass::Get(STAT_CLASS_WAYP)->GetSpec(type);
 
        DrawPixelInfo tmp_dpi;
        if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.Width(), r.Height())) {
          DrawPixelInfo *old_dpi = _cur_dpi;
          _cur_dpi = &tmp_dpi;
          int x = (r.Width()  - ScaleSpriteTrad(64)) / 2 + ScaleSpriteTrad(31);
          int y = (r.Height() + ScaleSpriteTrad(58)) / 2 - ScaleSpriteTrad(31);
          DrawWaypointSprite(x, y, type, _cur_railtype);
          _cur_dpi = old_dpi;
        }
 
        if (!IsStationAvailable(statspec)) {
          GfxFillRect(r.Shrink(WidgetDimensions::scaled.bevel), PC_BLACK, FILLRECT_CHECKER);
        }
      }
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (GB(widget, 0, 16)) {
      case WID_BRW_WAYPOINT: {
        byte type = GB(widget, 16, 16);
        this->GetWidget<NWidgetMatrix>(WID_BRW_WAYPOINT_MATRIX)->SetClicked(_cur_waypoint_type);
 
        /* Check station availability callback */
        const StationSpec *statspec = StationClass::Get(STAT_CLASS_WAYP)->GetSpec(type);
        if (!IsStationAvailable(statspec)) return;
 
        _cur_waypoint_type = type;
        this->GetWidget<NWidgetMatrix>(WID_BRW_WAYPOINT_MATRIX)->SetClicked(_cur_waypoint_type);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->SetDirty();
        break;
      }
    }
  }
};
 
static const NWidgetPart _nested_build_waypoint_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_WAYPOINT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_DEFSIZEBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
      NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BRW_WAYPOINT_MATRIX), SetPIP(0, 2, 0),  SetPadding(3), SetScrollbar(WID_BRW_SCROLL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BRW_WAYPOINT), SetMinimalSize(66, 60), SetDataTip(0x0, STR_WAYPOINT_GRAPHICS_TOOLTIP), SetScrollbar(WID_BRW_SCROLL), EndContainer(),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_BRW_SCROLL),
      NWidget(WWT_RESIZEBOX, COLOUR_DARK_GREEN),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _build_waypoint_desc(
  WDP_AUTO, "build_waypoint", 0, 0,
  WC_BUILD_WAYPOINT, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_build_waypoint_widgets, lengthof(_nested_build_waypoint_widgets)
);
 
static void ShowBuildWaypointPicker(Window *parent)
{
  new BuildRailWaypointWindow(&_build_waypoint_desc, parent);
}
 
void InitializeRailGui()
{
  _build_depot_direction = DIAGDIR_NW;
  _railstation.station_class = StationClassID::STAT_CLASS_DFLT;
}
 
void ReinitGuiAfterToggleElrail(bool disable)
{
  extern RailType _last_built_railtype;
  if (disable && _last_built_railtype == RAILTYPE_ELECTRIC) {
    _last_built_railtype = _cur_railtype = RAILTYPE_RAIL;
    BuildRailToolbarWindow *w = dynamic_cast<BuildRailToolbarWindow *>(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
    if (w != nullptr) w->ModifyRailType(_cur_railtype);
  }
  MarkWholeScreenDirty();
}
 
static void SetDefaultRailGui()
{
  if (_local_company == COMPANY_SPECTATOR || !Company::IsValidID(_local_company)) return;
 
  extern RailType _last_built_railtype;
  RailType rt;
  switch (_settings_client.gui.default_rail_type) {
    case 2: {
      /* Find the most used rail type */
      uint count[RAILTYPE_END];
      memset(count, 0, sizeof(count));
      for (TileIndex t = 0; t < MapSize(); t++) {
        if (IsTileType(t, MP_RAILWAY) || IsLevelCrossingTile(t) || HasStationTileRail(t) ||
            (IsTileType(t, MP_TUNNELBRIDGE) && GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL)) {
          count[GetRailType(t)]++;
        }
      }
 
      rt = static_cast<RailType>(std::max_element(count + RAILTYPE_BEGIN, count + RAILTYPE_END) - count);
      if (count[rt] > 0) break;
 
      /* No rail, just get the first available one */
      FALLTHROUGH;
    }
    case 0: {
      /* Use first available type */
      std::vector<RailType>::const_iterator it = std::find_if(_sorted_railtypes.begin(), _sorted_railtypes.end(),
          [](RailType r){ return HasRailtypeAvail(_local_company, r); });
      rt = it != _sorted_railtypes.end() ? *it : RAILTYPE_BEGIN;
      break;
    }
    case 1: {
      /* Use last available type */
      std::vector<RailType>::const_reverse_iterator it = std::find_if(_sorted_railtypes.rbegin(), _sorted_railtypes.rend(),
          [](RailType r){ return HasRailtypeAvail(_local_company, r); });
      rt = it != _sorted_railtypes.rend() ? *it : RAILTYPE_BEGIN;
      break;
    }
    default:
      NOT_REACHED();
  }
 
  _last_built_railtype = _cur_railtype = rt;
  BuildRailToolbarWindow *w = dynamic_cast<BuildRailToolbarWindow *>(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
  if (w != nullptr) w->ModifyRailType(_cur_railtype);
}
 
void ResetSignalVariant(int32 new_value)
{
  SignalVariant new_variant = (_cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC);
 
  if (new_variant != _cur_signal_variant) {
    Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
    if (w != nullptr) {
      w->SetDirty();
      w->RaiseWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);
    }
    _cur_signal_variant = new_variant;
  }
}
 
void InitializeRailGUI()
{
  SetDefaultRailGui();
 
  _convert_signal_button = false;
  _cur_signal_type = _settings_client.gui.default_signal_type;
  ResetSignalVariant();
}
 
DropDownList GetRailTypeDropDownList(bool for_replacement, bool all_option)
{
  RailTypes used_railtypes;
  RailTypes avail_railtypes;
 
  const Company *c = Company::Get(_local_company);
 
  /* Find the used railtypes. */
  if (for_replacement) {
    avail_railtypes = GetCompanyRailtypes(c->index, false);
    used_railtypes  = GetRailTypes(false);
  } else {
    avail_railtypes = c->avail_railtypes;
    used_railtypes  = GetRailTypes(true);
  }
 
  DropDownList list;
 
  if (all_option) {
    list.emplace_back(new DropDownListStringItem(STR_REPLACE_ALL_RAILTYPE, INVALID_RAILTYPE, false));
  }
 
  Dimension d = { 0, 0 };
  /* Get largest icon size, to ensure text is aligned on each menu item. */
  if (!for_replacement) {
    for (const auto &rt : _sorted_railtypes) {
      if (!HasBit(used_railtypes, rt)) continue;
      const RailtypeInfo *rti = GetRailTypeInfo(rt);
      d = maxdim(d, GetSpriteSize(rti->gui_sprites.build_x_rail));
    }
  }
 
  for (const auto &rt : _sorted_railtypes) {
    /* If it's not used ever, don't show it to the user. */
    if (!HasBit(used_railtypes, rt)) continue;
 
    const RailtypeInfo *rti = GetRailTypeInfo(rt);
 
    StringID str = for_replacement ? rti->strings.replace_text : (rti->max_speed > 0 ? STR_TOOLBAR_RAILTYPE_VELOCITY : STR_JUST_STRING);
    DropDownListParamStringItem *item;
    if (for_replacement) {
      item = new DropDownListParamStringItem(str, rt, !HasBit(avail_railtypes, rt));
    } else {
      DropDownListIconItem *iconitem = new DropDownListIconItem(rti->gui_sprites.build_x_rail, PAL_NONE, str, rt, !HasBit(avail_railtypes, rt));
      iconitem->SetDimension(d);
      item = iconitem;
    }
    item->SetParam(0, rti->strings.menu_text);
    item->SetParam(1, rti->max_speed);
    list.emplace_back(item);
  }
 
  if (list.size() == 0) {
    /* Empty dropdowns are not allowed */
    list.emplace_back(new DropDownListStringItem(STR_NONE, INVALID_RAILTYPE, true));
  }
 
  return list;
}