text: /*
   * 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/>.
   */
  
  /** @file rail_gui.cpp %File for dealing with rail construction user interface */
  
  #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 "station_map.h"
  #include "tunnelbridge_map.h"
  
  #include "widgets/rail_widget.h"
  
  #include "safeguards.h"
  
  
  static RailType _cur_railtype;               ///< Rail type of the current build-rail toolbar.
  static bool _remove_button_clicked;          ///< Flag whether 'remove' toggle-button is currently enabled
  static DiagDirection _build_depot_direction; ///< Currently selected depot direction
  static byte _waypoint_count = 1;             ///< Number of waypoint types
  static byte _cur_waypoint_type;              ///< Currently selected waypoint type
  static bool _convert_signal_button;          ///< convert signal button in the signal GUI pressed
  static SignalVariant _cur_signal_variant;    ///< set the signal variant (for signal GUI)
  static SignalType _cur_signal_type;          ///< set the signal type (for signal GUI)
  
  /* Map the setting: default_signal_type to the corresponding signal type */
  static const SignalType _default_signal_type[] = {SIGTYPE_NORMAL, SIGTYPE_PBS, SIGTYPE_PBS_ONEWAY};
  
  struct RailStationGUISettings {
  	Axis orientation;                 ///< Currently selected rail station orientation
  
  	bool newstations;                 ///< Are custom station definitions available?
  	StationClassID station_class;     ///< Currently selected custom station class (if newstations is \c true )
  	byte station_type;                ///< %Station type within the currently selected custom station class (if newstations is \c true )
  	byte station_count;               ///< Number of custom stations (if newstations is \c true )
  };
  static RailStationGUISettings _railstation; ///< Settings of the station builder GUI
  
  
  static void HandleStationPlacement(TileIndex start, TileIndex end);
  static void ShowBuildTrainDepotPicker(Window *parent);
  static void ShowBuildWaypointPicker(Window *parent);
  static void ShowStationBuilder(Window *parent);
  static void ShowSignalBuilder(Window *parent);
  
  /**
   * Check whether a station type can be build.
   * @return true if building is allowed.
   */
  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_SPLAT_RAIL(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, uint32 cmd)
  {
  	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_20_SPLAT_RAIL, tile);
  }
  
  static void GenericPlaceRail(TileIndex tile, int cmd)
  {
  	DoCommandP(tile, _cur_railtype, cmd,
  			_remove_button_clicked ?
  			CMD_REMOVE_SINGLE_RAIL | CMD_MSG(STR_ERROR_CAN_T_REMOVE_RAILROAD_TRACK) :
  			CMD_BUILD_SINGLE_RAIL | CMD_MSG(STR_ERROR_CAN_T_BUILD_RAILROAD_TRACK),
  			CcPlaySound_SPLAT_RAIL);
  }
  
  /**
   * Try to add an additional rail-track at the entrance of a depot
   * @param tile  Tile to use for adding the rail-track
   * @param dir   Direction to check for already present tracks
   * @param track Track to add
   * @see CcRailDepot()
   */
  static void PlaceExtraDepotRail(TileIndex tile, DiagDirection dir, Track track)
  {
  	if (GetRailTileType(tile) != RAIL_TILE_NORMAL) return;
  	if ((GetTrackBits(tile) & DiagdirReachesTracks(dir)) == 0) return;
  
  	DoCommandP(tile, _cur_railtype, track, CMD_BUILD_SINGLE_RAIL);
  }
  
  /** Additional pieces of track to add at the entrance of a depot. */
  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
  };
  
  /** Direction to check for existing track pieces. */
  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(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, uint32 cmd)
  {
  	if (result.Failed()) return;
  
  	DiagDirection dir = (DiagDirection)p2;
  
  	if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_SPLAT_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]);
  	}
  }
  
  /**
   * Place a rail waypoint.
   * @param tile Position to start dragging a waypoint.
   */
  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. */
  		DoCommandP(tile, 1 << 8 | 1 << 16, STAT_CLASS_WAYP | INVALID_STATION << 16, CMD_BUILD_RAIL_WAYPOINT | CMD_MSG(STR_ERROR_CAN_T_BUILD_TRAIN_WAYPOINT));
  	}
  }
  
  void CcStation(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, uint32 cmd)
  {
  	if (result.Failed()) return;
  
  	if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_SPLAT_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();
  }
  
  /**
   * Place a rail station.
   * @param tile Position to place or start dragging a station.
   */
  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 {
  		uint32 p1 = _cur_railtype | _railstation.orientation << 6 | _settings_client.gui.station_numtracks << 8 | _settings_client.gui.station_platlength << 16 | _ctrl_pressed << 24;
  		uint32 p2 = _railstation.station_class | _railstation.station_type << 8 | INVALID_STATION << 16;
  
  		int w = _settings_client.gui.station_numtracks;
  		int h = _settings_client.gui.station_platlength;
  		if (!_railstation.orientation) Swap(w, h);
  
  		CommandContainer cmdcont = { tile, p1, p2, CMD_BUILD_RAIL_STATION | CMD_MSG(STR_ERROR_CAN_T_BUILD_RAILROAD_STATION), CcStation, "" };
  		ShowSelectStationIfNeeded(cmdcont, TileArea(tile, w, h));
  	}
  }
  
  /**
   * Build a new signal or edit/remove a present signal, use CmdBuildSingleSignal() or CmdRemoveSingleSignal() in rail_cmd.cpp
   *
   * @param tile The tile where the signal will build or edit
   */
  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) {
  		DoCommandP(tile, track, 0, CMD_REMOVE_SIGNALS | CMD_MSG(STR_ERROR_CAN_T_REMOVE_SIGNALS_FROM), CcPlaySound_SPLAT_RAIL);
  	} else {
  		const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
  
  		/* Map the setting cycle_signal_types to the lower and upper allowed signal type. */
  		static const uint cycle_bounds[] = {SIGTYPE_NORMAL | (SIGTYPE_LAST_NOPBS << 3), SIGTYPE_PBS | (SIGTYPE_LAST << 3), SIGTYPE_NORMAL | (SIGTYPE_LAST << 3)};
  
  		/* various bitstuffed elements for CmdBuildSingleSignal() */
  		uint32 p1 = track;
  
  		if (w != nullptr) {
  			/* signal GUI is used */
  			SB(p1, 3, 1, _ctrl_pressed);
  			SB(p1, 4, 1, _cur_signal_variant);
  			SB(p1, 5, 3, _cur_signal_type);
  			SB(p1, 8, 1, _convert_signal_button);
  			SB(p1, 9, 6, cycle_bounds[_settings_client.gui.cycle_signal_types]);
  		} else {
  			SB(p1, 3, 1, _ctrl_pressed);
  			SB(p1, 4, 1, (_cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC));
  			SB(p1, 5, 3, _default_signal_type[_settings_client.gui.default_signal_type]);
  			SB(p1, 8, 1, 0);
  			SB(p1, 9, 6, cycle_bounds[_settings_client.gui.cycle_signal_types]);
  		}
  
  		DoCommandP(tile, p1, 0, CMD_BUILD_SIGNALS |
  				CMD_MSG((w != nullptr && _convert_signal_button) ? STR_ERROR_SIGNAL_CAN_T_CONVERT_SIGNALS_HERE : STR_ERROR_CAN_T_BUILD_SIGNALS_HERE),
  				CcPlaySound_SPLAT_RAIL);
  	}
  }
  
  /**
   * Start placing a rail bridge.
   * @param tile Position of the first tile of the bridge.
   * @param w    Rail toolbar window.
   */
  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);
  	}
  }
  
  /** Command callback for building a tunnel */
  void CcBuildRailTunnel(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, uint32 cmd)
  {
  	if (result.Succeeded()) {
  		if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_SPLAT_RAIL, tile);
  		if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
  	} else {
  		SetRedErrorSquare(_build_tunnel_endtile);
  	}
  }
  
  /**
   * Toggles state of the Remove button of Build rail toolbar
   * @param w window the button belongs to
   */
  static void ToggleRailButton_Remove(Window *w)
  {
  	DeleteWindowById(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);
  }
  
  /**
   * Updates the Remove button because of Ctrl state change
   * @param w window the button belongs to
   * @return true iff the remove button was changed
   */
  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;
  }
  
  
  /**
   * The "remove"-button click proc of the build-rail toolbar.
   * @param w Build-rail toolbar window
   * @see BuildRailToolbarWindow::OnClick()
   */
  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(int mode)
  {
  	DoCommandP(TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y), _cur_railtype | (mode << 6),
  			_remove_button_clicked ?
  			CMD_REMOVE_RAILROAD_TRACK | CMD_MSG(STR_ERROR_CAN_T_REMOVE_RAILROAD_TRACK) :
  			CMD_BUILD_RAILROAD_TRACK  | CMD_MSG(STR_ERROR_CAN_T_BUILD_RAILROAD_TRACK),
  			CcPlaySound_SPLAT_RAIL);
  }
  
  static void HandleAutodirPlacement()
  {
  	int trackstat = _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);
  }
  
  /**
   * Build new signals or remove signals or (if only one tile marked) edit a signal.
   *
   * If one tile marked abort and use GenericPlaceSignals()
   * else use CmdBuildSingleSignal() or CmdRemoveSingleSignal() in rail_cmd.cpp to build many signals
   */
  static void HandleAutoSignalPlacement()
  {
  	uint32 p2 = 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;
  	}
  
  	const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
  
  	if (w != nullptr) {
  		/* signal GUI is used */
  		SB(p2,  3, 1, 0);
  		SB(p2,  4, 1, _cur_signal_variant);
  		SB(p2,  6, 1, _ctrl_pressed);
  		SB(p2,  7, 3, _cur_signal_type);
  		SB(p2, 24, 8, _settings_client.gui.drag_signals_density);
  		SB(p2, 10, 1, !_settings_client.gui.drag_signals_fixed_distance);
  	} else {
  		SB(p2,  3, 1, 0);
  		SB(p2,  4, 1, (_cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC));
  		SB(p2,  6, 1, _ctrl_pressed);
  		SB(p2,  7, 3, _default_signal_type[_settings_client.gui.default_signal_type]);
  		SB(p2, 24, 8, _settings_client.gui.drag_signals_density);
  		SB(p2, 10, 1, !_settings_client.gui.drag_signals_fixed_distance);
  	}
  
  	/* _settings_client.gui.drag_signals_density is given as a parameter such that each user
  	 * in a network game can specify his/her own signal density */
  	DoCommandP(TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y), p2,
  			_remove_button_clicked ?
  			CMD_REMOVE_SIGNAL_TRACK | CMD_MSG(STR_ERROR_CAN_T_REMOVE_SIGNALS_FROM) :
  			CMD_BUILD_SIGNAL_TRACK  | CMD_MSG(STR_ERROR_CAN_T_BUILD_SIGNALS_HERE),
  			CcPlaySound_SPLAT_RAIL);
  }
  
  
  /** Rail toolbar management class. */
  struct BuildRailToolbarWindow : Window {
  	RailType railtype;    ///< Rail type to build.
  	int last_user_action; ///< Last started 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);
  	}
  
  	~BuildRailToolbarWindow()
  	{
  		if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) SetViewportCatchmentStation(nullptr, true);
  		if (_settings_client.gui.link_terraform_toolbar) DeleteWindowById(WC_SCEN_LAND_GEN, 0, false);
  	}
  
  	/**
  	 * Some data on this window has become invalid.
  	 * @param data Information about the changed data.
  	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
  	 */
  	void OnInvalidateData(int data = 0, bool gui_scope = true) override
  	{
  		if (!gui_scope) return;
  
  		if (!CanBuildVehicleInfrastructure(VEH_TRAIN)) delete this;
  	}
  
  	/**
  	 * Configures the rail toolbar for railtype given
  	 * @param railtype the railtype to display
  	 */
  	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;
  	}
  
  	/**
  	 * Switch to another rail type.
  	 * @param railtype New rail type.
  	 */
  	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 && _settings_client.gui.enable_signal_gui != _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:
  				DoCommandP(tile, _cur_railtype, _build_depot_direction,
  						CMD_BUILD_TRAIN_DEPOT | CMD_MSG(STR_ERROR_CAN_T_BUILD_TRAIN_DEPOT),
  						CcRailDepot);
  				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:
  				DoCommandP(tile, _cur_railtype | (TRANSPORT_RAIL << 8), 0, CMD_BUILD_TUNNEL | CMD_MSG(STR_ERROR_CAN_T_BUILD_TUNNEL_HERE), CcBuildRailTunnel);
  				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:
  					DoCommandP(end_tile, start_tile, _cur_railtype | (_ctrl_pressed ? 1 << 6 : 0), CMD_CONVERT_RAIL | CMD_MSG(STR_ERROR_CAN_T_CONVERT_RAIL), CcPlaySound_SPLAT_RAIL);
  					break;
  
  				case DDSP_REMOVE_STATION:
  				case DDSP_BUILD_STATION:
  					if (this->IsWidgetLowered(WID_RAT_BUILD_STATION)) {
  						/* Station */
  						if (_remove_button_clicked) {
  							DoCommandP(end_tile, start_tile, _ctrl_pressed ? 0 : 1, CMD_REMOVE_FROM_RAIL_STATION | CMD_MSG(STR_ERROR_CAN_T_REMOVE_PART_OF_STATION), CcPlaySound_SPLAT_RAIL);
  						} else {
  							HandleStationPlacement(start_tile, end_tile);
  						}
  					} else {
  						/* Waypoint */
  						if (_remove_button_clicked) {
  							DoCommandP(end_tile, start_tile, _ctrl_pressed ? 0 : 1, CMD_REMOVE_FROM_RAIL_WAYPOINT | CMD_MSG(STR_ERROR_CAN_T_REMOVE_TRAIN_WAYPOINT), CcPlaySound_SPLAT_RAIL);
  						} else {
  							TileArea ta(start_tile, end_tile);
  							uint32 p1 = _cur_railtype | (select_method == VPM_X_LIMITED ? AXIS_X : AXIS_Y) << 6 | ta.w << 8 | ta.h << 16 | _ctrl_pressed << 24;
  							uint32 p2 = STAT_CLASS_WAYP | _cur_waypoint_type << 8 | INVALID_STATION << 16;
  
  							CommandContainer cmdcont = { ta.tile, p1, p2, CMD_BUILD_RAIL_WAYPOINT | CMD_MSG(STR_ERROR_CAN_T_BUILD_TRAIN_WAYPOINT), CcPlaySound_SPLAT_RAIL, "" };
  							ShowSelectWaypointIfNeeded(cmdcont, ta);
  						}
  					}
  					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);
  
  		DeleteWindowById(WC_BUILD_SIGNAL, TRANSPORT_RAIL);
  		DeleteWindowById(WC_BUILD_STATION, TRANSPORT_RAIL);
  		DeleteWindowById(WC_BUILD_DEPOT, TRANSPORT_RAIL);
  		DeleteWindowById(WC_BUILD_WAYPOINT, TRANSPORT_RAIL);
  		DeleteWindowById(WC_SELECT_STATION, 0);
  		DeleteWindowByClass(WC_BUILD_BRIDGE);
  	}
  
  	void OnPlacePresize(Point pt, TileIndex tile) override
  	{
  		DoCommand(tile, _cur_railtype | (TRANSPORT_RAIL << 8), 0, DC_AUTO, CMD_BUILD_TUNNEL);
  		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;
  };
  
  /**
   * Handler for global hotkeys of the BuildRailToolbarWindow.
   * @param hotkey Hotkey
   * @return ES_HANDLED if hotkey was accepted.
   */
  static EventState RailToolbarGlobalHotkeys(int hotkey)
  {
  	if (_game_mode != GM_NORMAL || !CanBuildVehicleInfrastructure(VEH_TRAIN)) 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), SetDataTip(0x0, STR_NULL), 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
  );
  
  
  /**
   * Open the build rail toolbar window for a specific rail type.
   *
   * If the terraform toolbar is linked to the toolbar, that window is also opened.
   *
   * @param railtype Rail type to open the window for
   * @return newly opened rail toolbar, or nullptr if the toolbar could not be opened.
   */
  Window *ShowBuildRailToolbar(RailType railtype)
  {
  	if (!Company::IsValidID(_local_company)) return nullptr;
  	if (!ValParamRailtype(railtype)) return nullptr;
  
  	DeleteWindowByClass(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);
  
  	uint32 p1 = _cur_railtype | _railstation.orientation << 6 | numtracks << 8 | platlength << 16 | _ctrl_pressed << 24;
  	uint32 p2 = _railstation.station_class | _railstation.station_type << 8 | INVALID_STATION << 16;
  
  	CommandContainer cmdcont = { ta.tile, p1, p2, CMD_BUILD_RAIL_STATION | CMD_MSG(STR_ERROR_CAN_T_BUILD_RAILROAD_STATION), CcStation, "" };
  	ShowSelectStationIfNeeded(cmdcont, ta);
  }
  
  struct BuildRailStationWindow : public PickerWindowBase {
  private:
  	uint line_height;     ///< Height of a single line in the newstation selection matrix (#WID_BRAS_NEWST_LIST widget).
  	uint coverage_height; ///< Height of the coverage texts.
  	Scrollbar *vscroll;   ///< Vertical scrollbar of the new station list.
  	Scrollbar *vscroll2;  ///< Vertical scrollbar of the matrix with new stations.
  
  	/**
  	 * Verify whether the currently selected station size is allowed after selecting a new station class/type.
  	 * If not, change the station size variables ( _settings_client.gui.station_numtracks and _settings_client.gui.station_platlength ).
  	 * @param statspec Specification of the new station class/type
  	 */
  	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)
  	{
  		this->coverage_height = 2 * FONT_HEIGHT_NORMAL + 3 * WD_PAR_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);
  		if (newstation) {
  			this->vscroll = this->GetScrollbar(WID_BRAS_NEWST_SCROLL);
  			this->vscroll2 = this->GetScrollbar(WID_BRAS_MATRIX_SCROLL);
  		}
  		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 >= (int)StationClass::GetClassCount()) {
  			/* New stations are not available or changed, so ensure the default station
  			 * type is 'selected'. */
  			_railstation.station_class = STAT_CLASS_DFLT;
  			_railstation.station_type = 0;
  			this->vscroll2 = nullptr;
  		}
  		if (newstation) {
  			_railstation.station_count = StationClass::Get(_railstation.station_class)->GetSpecCount();
  			_railstation.station_type = min(_railstation.station_type, _railstation.station_count - 1);
  
  			int count = 0;
  			for (uint i = 0; i < StationClass::GetClassCount(); i++) {
  				if (i == STAT_CLASS_WAYP) continue;
  				count++;
  			}
  			this->vscroll->SetCount(count);
  			this->vscroll->SetPosition(Clamp(_railstation.station_class - 2, 0, max(this->vscroll->GetCount() - this->vscroll->GetCapacity(), 0)));
  
  			NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BRAS_MATRIX);
  			matrix->SetScrollbar(this->vscroll2);
  			matrix->SetCount(_railstation.station_count);
  			matrix->SetClicked(_railstation.station_type);
  		}
  	}
  
  	virtual ~BuildRailStationWindow()
  	{
  		DeleteWindowById(WC_SELECT_STATION, 0);
  	}
  
  	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. */
  		NWidgetBase *cov = this->GetWidget<NWidgetBase>(WID_BRAS_COVERAGE_TEXTS);
  		int top = cov->pos_y + WD_PAR_VSEP_NORMAL;
  		int left = cov->pos_x + WD_FRAMERECT_LEFT;
  		int right = cov->pos_x + cov->current_x - WD_FRAMERECT_RIGHT;
  		int bottom = cov->pos_y + cov->current_y;
  		top = DrawStationCoverageAreaText(left, right, top, SCT_ALL, rad, false) + WD_PAR_VSEP_NORMAL;
  		top = DrawStationCoverageAreaText(left, right, top, SCT_ALL, rad, true) + WD_PAR_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 > bottom) {
  			this->coverage_height += top - 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 (uint i = 0; i < StationClass::GetClassCount(); i++) {
  					if (i == STAT_CLASS_WAYP) continue;
  					d = maxdim(d, GetStringBoundingBox(StationClass::Get((StationClassID)i)->name));
  				}
  				size->width = max(size->width, d.width + padding.width);
  				this->line_height = FONT_HEIGHT_NORMAL + WD_MATRIX_TOP + WD_MATRIX_BOTTOM;
  				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 (StationClassID statclass = STAT_CLASS_BEGIN; statclass < (StationClassID)StationClass::GetClassCount(); statclass++) {
  					if (statclass == STAT_CLASS_WAYP) continue;
  					StationClass *stclass = StationClass::Get(statclass);
  					for (uint16 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 = 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) + 2;
  				size->height = ScaleGUITrad(58) + 2;
  				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.right - r.left + 1, r.bottom - r.top + 1)) {
  					DrawPixelInfo *old_dpi = _cur_dpi;
  					_cur_dpi = &tmp_dpi;
  					int x = ScaleGUITrad(31) + 1;
  					int y = r.bottom - r.top - ScaleGUITrad(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.right - r.left + 1, r.bottom - r.top + 1)) {
  					DrawPixelInfo *old_dpi = _cur_dpi;
  					_cur_dpi = &tmp_dpi;
  					int x = ScaleGUITrad(31) + 1;
  					int y = r.bottom - r.top - ScaleGUITrad(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: {
  				uint statclass = 0;
  				uint row = 0;
  				for (uint i = 0; i < StationClass::GetClassCount(); i++) {
  					if (i == STAT_CLASS_WAYP) continue;
  					if (this->vscroll->IsVisible(statclass)) {
  						DrawString(r.left + WD_MATRIX_LEFT, r.right - WD_MATRIX_RIGHT, row * this->line_height + r.top + WD_MATRIX_TOP,
  								StationClass::Get((StationClassID)i)->name,
  								(StationClassID)i == _railstation.station_class ? TC_WHITE : TC_BLACK);
  						row++;
  					}
  					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.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK, FILLRECT_CHECKER);
  				}
  
  				/* Set up a clipping area for the station preview. */
  				if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.right - r.left + 1, r.bottom - r.top + 1)) {
  					DrawPixelInfo *old_dpi = _cur_dpi;
  					_cur_dpi = &tmp_dpi;
  					int x = ScaleGUITrad(31) + 1;
  					int y = r.bottom - r.top - ScaleGUITrad(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();
  				DeleteWindowById(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();
  				DeleteWindowById(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();
  				DeleteWindowById(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();
  				DeleteWindowById(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, 0, this->line_height);
  				if (y >= (int)StationClass::GetClassCount()) return;
  				for (uint i = 0; i < StationClass::GetClassCount(); i++) {
  					if (i == STAT_CLASS_WAYP) continue;
  					if (y == 0) {
  						if (_railstation.station_class != (StationClassID)i) {
  							_railstation.station_class = (StationClassID)i;
  							StationClass *stclass = StationClass::Get(_railstation.station_class);
  							_railstation.station_count = stclass->GetSpecCount();
  							_railstation.station_type  = min((int)_railstation.station_type, max(0, (int)_railstation.station_count - 1));
  
  							this->CheckSelectedSize(stclass->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();
  						DeleteWindowById(WC_SELECT_STATION, 0);
  						break;
  					}
  					y--;
  				}
  				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();
  				DeleteWindowById(WC_SELECT_STATION, 0);
  				break;
  			}
  		}
  	}
  
  	void OnRealtimeTick(uint delta_ms) override
  	{
  		CheckRedrawStationCoverage(this);
  	}
  };
  
  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),
  			NWidget(NWID_VERTICAL),
  				NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_ADDITIONS),
  					NWidget(NWID_HORIZONTAL), SetPIP(7, 0, 7), SetPadding(2, 0, 1, 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, 2),
  				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), SetMinimalSize(144, 11), SetDataTip(STR_STATION_BUILD_COVERAGE_AREA_TITLE, STR_NULL), SetPadding(3, 2, 0, 2),
  				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), SetPadding(2, 0, 0, 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), 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(),
  };
  
  /** High level window description of the station-build window (default & newGRF) */
  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)
  );
  
  /** Open station build window */
  static void ShowStationBuilder(Window *parent)
  {
  	bool newstations = StationClass::GetClassCount() > 2 || StationClass::Get(STAT_CLASS_DFLT)->GetSpecCount() != 1;
  	new BuildRailStationWindow(&_station_builder_desc, parent, newstations);
  }
  
  struct BuildSignalWindow : public PickerWindowBase {
  private:
  	Dimension sig_sprite_size;     ///< Maximum size of signal GUI sprites.
  	int sig_sprite_bottom_offset;  ///< Maximum extent of signal GUI sprite from reference point towards bottom.
  
  	/**
  	 * Draw dynamic a signal-sprite in a button in the signal GUI
  	 * Draw the sprite +1px to the right and down if the button is lowered
  	 *
  	 * @param widget_index index of this widget in the window
  	 * @param image        the sprite to draw
  	 */
  	void DrawSignalSprite(byte widget_index, SpriteID image) const
  	{
  		Point offset;
  		Dimension sprite_size = GetSpriteSize(image, &offset);
  		const NWidgetBase *widget = this->GetWidget<NWidgetBase>(widget_index);
  		int x = widget->pos_x - offset.x +
  				(widget->current_x - sprite_size.width + offset.x) / 2;  // centered
  		int y = widget->pos_y - sig_sprite_bottom_offset + WD_IMGBTN_TOP +
  				(widget->current_y - WD_IMGBTN_TOP - WD_IMGBTN_BOTTOM + sig_sprite_size.height) / 2; // aligned to bottom
  
  		DrawSprite(image, PAL_NONE,
  				x + this->IsWidgetLowered(widget_index),
  				y + this->IsWidgetLowered(widget_index));
  	}
  
  public:
  	BuildSignalWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
  	{
  		this->InitNested(TRANSPORT_RAIL);
  		this->OnInvalidateData();
  	}
  
  	~BuildSignalWindow()
  	{
  		_convert_signal_button = false;
  	}
  
  	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 = max<int>(this->sig_sprite_bottom_offset, sprite_size.height);
  					this->sig_sprite_size.width = max<int>(this->sig_sprite_size.width, sprite_size.width - offset.x);
  					this->sig_sprite_size.height = 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 = max(size->width, 2 * GetDigitWidth() + padding.width + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT);
  		} else if (IsInsideMM(widget, WID_BS_SEMAPHORE_NORM, WID_BS_ELECTRIC_PBS_OWAY + 1)) {
  			size->width = max(size->width, this->sig_sprite_size.width + WD_IMGBTN_LEFT + WD_IMGBTN_RIGHT);
  			size->height = max(size->height, this->sig_sprite_size.height + WD_IMGBTN_TOP + WD_IMGBTN_BOTTOM);
  		}
  	}
  
  	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(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;
  
  				/* 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;
  
  			default: break;
  		}
  
  		this->InvalidateData();
  	}
  
  	/**
  	 * Some data on this window has become invalid.
  	 * @param data Information about the changed data.
  	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
  	 */
  	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);
  	}
  };
  
  /** Nested widget definition of the build signal window */
  static const NWidgetPart _nested_signal_builder_widgets[] = {
  	NWidget(NWID_HORIZONTAL),
  		NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
  		NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_BUILD_SIGNAL_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
  	EndContainer(),
  	NWidget(NWID_VERTICAL, NC_EQUALSIZE),
  		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_NORM), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_NORM_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_ENTRY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_ENTRY_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_EXIT), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_EXIT_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_SEMAPHORE_COMBO), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_SEMAPHORE_COMBO_TOOLTIP), EndContainer(), SetFill(1, 1),
  			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(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_NORM), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_NORM_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_ENTRY), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_ENTRY_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_EXIT), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_EXIT_TOOLTIP), EndContainer(), SetFill(1, 1),
  			NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BS_ELECTRIC_COMBO), SetDataTip(STR_NULL, STR_BUILD_SIGNAL_ELECTRIC_COMBO_TOOLTIP), EndContainer(), SetFill(1, 1),
  			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(),
  };
  
  /** Signal selection window description */
  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)
  );
  
  /**
   * Open the signal selection window
   */
  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) + 2;
  		size->height = ScaleGUITrad(48) + 2;
  	}
  
  	void DrawWidget(const Rect &r, int widget) const override
  	{
  		if (!IsInsideMM(widget, WID_BRAD_DEPOT_NE, WID_BRAD_DEPOT_NW + 1)) return;
  
  		DrawTrainDepotSprite(r.left + 1 + ScaleGUITrad(31), r.bottom - ScaleGUITrad(31), widget - WID_BRAD_DEPOT_NE + DIAGDIR_NE, _cur_railtype);
  	}
  
  	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;
  		}
  	}
  };
  
  /** Nested widget definition of the build rail depot window */
  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);
  		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) + 2;
  				size->height = ScaleGUITrad(58) + 2;
  				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);
  				DrawWaypointSprite(r.left + 1 + ScaleGUITrad(31), r.bottom - ScaleGUITrad(31), type, _cur_railtype);
  
  				if (!IsStationAvailable(statspec)) {
  					GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, 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;
  			}
  		}
  	}
  };
  
  /** Nested widget definition for the build NewGRF rail waypoint window */
  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(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BRW_WAYPOINT_MATRIX), SetPIP(3, 2, 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(),
  		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);
  }
  
  /**
   * Initialize rail building GUI settings
   */
  void InitializeRailGui()
  {
  	_build_depot_direction = DIAGDIR_NW;
  }
  
  /**
   * Re-initialize rail-build toolbar after toggling support for electric trains
   * @param disable Boolean whether electric trains are disabled (removed from the game)
   */
  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();
  }
  
  /** Set the initial (default) railtype to use */
  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);
  }
  
  /**
   * Updates the current signal variant used in the signal GUI
   * to the one adequate to current year.
   * @param p needed to be called when a setting changes
   * @return success, needed for settings
   */
  bool ResetSignalVariant(int32 p)
  {
  	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;
  	}
  
  	return true;
  }
  
  /**
   * Resets the rail GUI - sets default railtype to build
   * and resets the signal GUI
   */
  void InitializeRailGUI()
  {
  	SetDefaultRailGui();
  
  	_convert_signal_button = false;
  	_cur_signal_type = _default_signal_type[_settings_client.gui.default_signal_type];
  	ResetSignalVariant();
  }
  
  /**
   * Create a drop down list for all the rail types of the local company.
   * @param for_replacement Whether this list is for the replacement window.
   * @param all_option Whether to add an 'all types' item.
   * @return The populated and sorted #DropDownList.
   */
  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 };
  	RailType rt;
  	/* Get largest icon size, to ensure text is aligned on each menu item. */
  	if (!for_replacement) {
  		FOR_ALL_SORTED_RAILTYPES(rt) {
  			if (!HasBit(used_railtypes, rt)) continue;
  			const RailtypeInfo *rti = GetRailTypeInfo(rt);
  			d = maxdim(d, GetSpriteSize(rti->gui_sprites.build_x_rail));
  		}
  	}
  
  	FOR_ALL_SORTED_RAILTYPES(rt) {
  		/* 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;
  }
  