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[openttd/fttd.git] / src / rail_gui.cpp

/* $Id$ */

/*
 * 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 "tile_cmd.h"
#include "station_func.h"
#include "rail.h"
#include "font.h"

#include "map/rail.h"
#include "map/depot.h"
#include "map/bridge.h"

#include "widgets/rail_widget.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


/** Dragging actions in the rail toolbar. */
enum {
        DRAG_DEMOLISH_AREA,     ///< Clear area
        DRAG_BUILD_BRIDGE,      ///< Bridge placement
        DRAG_PLACE_RAIL,        ///< Rail placement
        DRAG_BUILD_SIGNALS,     ///< Signal placement
        DRAG_STATION,           ///< Station placement/removal
        DRAG_BUILD_WAYPOINT_X,  ///< Waypoint placement along AXIS_X
        DRAG_BUILD_WAYPOINT_Y,  ///< Waypoint placement along AXIS_Y
        DRAG_REMOVE_WAYPOINT,   ///< Waypoint removal
        DRAG_CONVERT_RAIL,      ///< Rail conversion
};


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 == NULL || !HasBit(statspec->callback_mask, CBM_STATION_AVAIL)) return true;

        uint16 cb_res = GetStationCallback (CBID_STATION_AVAILABILITY, 0, 0, statspec, _cur_railtype);
        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)
{
        if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_20_SPLAT_RAIL, tile);
}

void CcSingleRail(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        if (HasBit(p1, 31)) return;

        CcPlaySound_SPLAT_RAIL(result, tile, p1, p2);
}

StringID GetErrBuildSingleRail (TileIndex tile, uint32 p1, uint32 p2, const char *text)
{
        return HasBit(p1, 31) ? 0 : STR_ERROR_CAN_T_BUILD_RAILROAD_TRACK;
}

void CcRailDepot(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        struct PlaceDepotExtraData {
                DiagDirection dir;   ///< direction to check
                Track         track; ///< track to build
        };

        static const PlaceDepotExtraData place_depot_extra_data[4][3] = {
                { {DIAGDIR_SE, TRACK_LEFT }, {DIAGDIR_SW, TRACK_X}, {DIAGDIR_NW, TRACK_LOWER} },
                { {DIAGDIR_SW, TRACK_UPPER}, {DIAGDIR_NW, TRACK_Y}, {DIAGDIR_NE, TRACK_LEFT } },
                { {DIAGDIR_SE, TRACK_UPPER}, {DIAGDIR_NE, TRACK_X}, {DIAGDIR_NW, TRACK_RIGHT} },
                { {DIAGDIR_SW, TRACK_RIGHT}, {DIAGDIR_SE, TRACK_Y}, {DIAGDIR_NE, TRACK_LOWER} },
        };

        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) ResetPointerMode();

        tile += TileOffsByDiagDir(dir);

        if (IsNormalRailTile(tile) && !HasSignalOnTrack(tile, TRACK_UPPER) && !HasSignalOnTrack(tile, TRACK_LOWER)) {
                for (int i = 0; i < 3; i++) {
                        if ((GetTrackBits(tile) & DiagdirReachesTracks(place_depot_extra_data[dir][i].dir)) != TRACK_BIT_NONE) {
                                DoCommandP(tile, _cur_railtype | (1 << 31), place_depot_extra_data[dir][i].track, CMD_BUILD_SINGLE_RAIL);
                        }
                }
        }
}

/**
 * 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, DRAG_REMOVE_WAYPOINT);
                return;
        }

        switch (GetAxisForNewWaypoint(tile)) {
                case AXIS_X:
                        VpStartPlaceSizing (tile, VPM_Y, DRAG_BUILD_WAYPOINT_X);
                        break;

                case AXIS_Y:
                        VpStartPlaceSizing (tile, VPM_X, DRAG_BUILD_WAYPOINT_Y);
                        break;

                default:
                        /* 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);
                        return;
        }

        VpSetPlaceSizingLimit (_settings_game.station.station_spread);
}

void CcStation(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        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) ResetPointerMode();
}

/** Get the only allowed bit, or a default if several are available. */
static inline uint GetSingleAllowedValue (byte disallowed, uint def)
{
        /* Sign-extend bit 7. */
        uint allowed = (int)(int8)(~disallowed);
        return HasExactlyOneBit (allowed) ? (FindFirstBit (allowed) + 1) : def;
}

/**
 * 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, DRAG_STATION);
                return;
        }

        uint w, h;
        if (_settings_client.gui.station_dragdrop) {
                const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
                if (statspec == NULL) {
                        w = h = 0;
                } else {
                        w = GetSingleAllowedValue (statspec->disallowed_platforms, 0);
                        h = GetSingleAllowedValue (statspec->disallowed_lengths, 0);
                }

                ViewportPlaceMethod method;
                if (w == 0 || h == 0) {
                        if (w != 0) {
                                /* fixed number of tracks */
                                method = _railstation.orientation ? VPM_Y : VPM_X;
                        } else if (h != 0) {
                                /* fixed platform length */
                                method = _railstation.orientation ? VPM_X : VPM_Y;
                        } else {
                                method = VPM_X_AND_Y;
                        }
                        VpStartPlaceSizing (tile, method, DRAG_STATION, _settings_game.station.station_spread);
                        return;
                }
        } else {
                w = _settings_client.gui.station_numtracks;
                h = _settings_client.gui.station_platlength;
        }

        uint32 p1 = _cur_railtype | _railstation.orientation << 4 | w << 8 | h << 16 | _ctrl_pressed << 24;
        uint32 p2 = _railstation.station_class | _railstation.station_type << 8 | INVALID_STATION << 16;

        if (!_railstation.orientation) Swap (w, h);

        Command cmdcont (tile, p1, p2, CMD_BUILD_RAIL_STATION);
        ShowSelectStationIfNeeded (&cmdcont, TileArea (tile, w, h));
}

StringID GetErrBuildSignals (TileIndex tile, uint32 p1, uint32 p2, const char *text)
{
        switch (GB(p1, 17, 3)) {
                case SIGNALS_CONVERT:
                case SIGNALS_TOGGLE_VARIANT:
                        return STR_ERROR_SIGNAL_CAN_T_CONVERT_SIGNALS_HERE;

                default:
                        return STR_ERROR_CAN_T_BUILD_SIGNALS_HERE;
        }
}

/**
 * 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(GetTileRailwayStatus(tile));

        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);
        } else {
                const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);

                /* Map the setting cycle_signal_types to the allowed signal bitmask. */
                static const uint signal_mask[] = {
                        (1 << SIGTYPE_PBS) - 1,
                        (1 << SIGTYPE_END) - (1 << SIGTYPE_PBS),
                        (1 << SIGTYPE_END) - 1,
                };

                /* various bitstuffed elements for CmdBuildSingleSignal() */
                uint32 p1 = track;

                if (w == NULL) {
                        /* signal GUI not used */
                        SB(p1, 4, 1, ((_cur_year < _settings_client.gui.semaphore_build_before) ^ _ctrl_pressed) ? SIG_SEMAPHORE : SIG_ELECTRIC);
                        SB(p1, 5, 3, _default_signal_type[_settings_client.gui.default_signal_type]);
                        SB(p1, 17, 3, _ctrl_pressed ? SIGNALS_CYCLE_TYPE : SIGNALS_BUILD);
                } else if (!_convert_signal_button) {
                        /* signal GUI is used, not converting */
                        SB(p1, 4, 1, _cur_signal_variant ^ _ctrl_pressed);
                        SB(p1, 5, 3, _cur_signal_type);
                        SB(p1, 17, 3, _ctrl_pressed ? SIGNALS_CYCLE_TYPE : SIGNALS_BUILD);
                } else {
                        /* signal GUI is used, converting */
                        SB(p1, 4, 1, _cur_signal_variant ^ _ctrl_pressed);
                        SB(p1, 5, 3, _cur_signal_type);
                        SB(p1, 17, 3, _ctrl_pressed ? SIGNALS_TOGGLE_VARIANT : SIGNALS_CONVERT);
                }

                DoCommandP(tile, p1, signal_mask[_settings_client.gui.cycle_signal_types], CMD_BUILD_SIGNALS);
        }
}

/** Show the bridge building window between a pair of tiles. */
static void HandleBuildRailBridge (TileIndex start_tile, TileIndex end_tile)
{
        if (!_settings_client.gui.persistent_buildingtools) ResetPointerMode();
        ShowBuildBridgeWindow (start_tile, end_tile, TRANSPORT_RAIL, _cur_railtype);
}

/**
 * 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;
}


/** Set the selection size for building a station. */
static void SetStationTileSelectSize (void)
{
        uint x, y;
        if (_settings_client.gui.station_dragdrop) {
                const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
                if (statspec == NULL) {
                        x = y = 1;
                } else {
                        x = GetSingleAllowedValue (statspec->disallowed_platforms, 1);
                        y = GetSingleAllowedValue (statspec->disallowed_lengths, 1);
                }
        } else {
                x = _settings_client.gui.station_numtracks;
                y = _settings_client.gui.station_platlength;
        }

        if (_railstation.orientation == AXIS_X) Swap(x, y);
        SetTileSelectSize (x, y);
        VpSetPlaceSizingLimit (_settings_game.station.station_spread);
}

/**
 * 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 */
                        SetTileSelectSize(1, 1);
                        VpSetPlaceSizingLimit (0);
                } else {
                        /* starting station build mode */
                        SetStationTileSelectSize();
                }
        } else if (w->IsWidgetLowered(WID_RAT_BUILD_WAYPOINT)) {
                /* Dragging is different for waypoints when removing,
                 * so reset it. */
                VpStopPlaceSizing();
        }
}

static void HandleAutodirPlacement (TileIndex start, TileIndex end)
{
        Track track = (Track)(_thd.drawstyle & HT_TRACK_MASK); // 0..5
        assert (IsValidTrack (track));

        if (start == end) { // one-tile case
                DoCommandP (end, _cur_railtype, track,
                                _remove_button_clicked ? CMD_REMOVE_SINGLE_RAIL : CMD_BUILD_SINGLE_RAIL);
                return;
        }

        DoCommandP (start, end, _cur_railtype | (track << 4),
                        _remove_button_clicked ? CMD_REMOVE_RAILROAD_TRACK : CMD_BUILD_RAILROAD_TRACK);
}

/**
 * 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 (TileIndex start, TileIndex end)
{
        uint32 p2 = GB(_thd.drawstyle, 0, 3); // 0..5

        if (start == end) { // one-tile case
                GenericPlaceSignals (end);
                return;
        }

        const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);

        if (w != NULL) {
                /* signal GUI is used */
                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,  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 (start, end, p2,
                        _remove_button_clicked ? CMD_REMOVE_SIGNAL_TRACK : CMD_BUILD_SIGNAL_TRACK);
}


/** Rail toolbar management class. */
struct BuildRailToolbarWindow : Window {
        RailType railtype;    ///< Rail type to build.
        int last_user_action; ///< Last started user action.

        BuildRailToolbarWindow (const WindowDesc *desc, RailType railtype) :
                Window (desc), railtype ((RailType)0),
                last_user_action (WIDGET_LIST_END)
        {
                this->InitNested(TRANSPORT_RAIL);
                this->SetupRailToolbar(railtype);
                this->DisableWidget(WID_RAT_REMOVE);

                if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
        }

        void OnDelete (void) FINAL_OVERRIDE
        {
                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.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                if (!gui_scope) return;

                if (!CanBuildVehicleInfrastructure(VEH_TRAIN)) this->Delete();
        }

        /**
         * 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;
                }
        }

        virtual void SetStringParameters(int widget) const
        {
                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);
                        }
                }
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                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, POINTER_RAIL_V);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_BUILD_X:
                                HandlePlacePushButton (this, WID_RAT_BUILD_X, GetRailTypeInfo(_cur_railtype)->cursor.rail_swne, POINTER_RAIL_X);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_BUILD_EW:
                                HandlePlacePushButton (this, WID_RAT_BUILD_EW, GetRailTypeInfo(_cur_railtype)->cursor.rail_ew, POINTER_RAIL_H);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_BUILD_Y:
                                HandlePlacePushButton (this, WID_RAT_BUILD_Y, GetRailTypeInfo(_cur_railtype)->cursor.rail_nwse, POINTER_RAIL_Y);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_AUTORAIL:
                                HandlePlacePushButton (this, WID_RAT_AUTORAIL, GetRailTypeInfo(_cur_railtype)->cursor.autorail, POINTER_RAIL_AUTO);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_DEMOLISH:
                                HandlePlacePushButton (this, WID_RAT_DEMOLISH, ANIMCURSOR_DEMOLISH, POINTER_TILE);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_BUILD_DEPOT:
                                if (HandlePlacePushButton (this, WID_RAT_BUILD_DEPOT, GetRailTypeInfo(_cur_railtype)->cursor.depot, POINTER_TILE)) {
                                        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, POINTER_TILE) && _waypoint_count > 1) {
                                        ShowBuildWaypointPicker(this);
                                }
                                break;

                        case WID_RAT_BUILD_STATION:
                                if (HandlePlacePushButton (this, WID_RAT_BUILD_STATION, SPR_CURSOR_RAIL_STATION, POINTER_TILE)) {
                                        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, POINTER_TILE);
                                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, POINTER_TILE);
                                this->last_user_action = widget;
                                break;

                        case WID_RAT_BUILD_TUNNEL:
                                HandlePlacePushButton (this, WID_RAT_BUILD_TUNNEL, GetRailTypeInfo(_cur_railtype)->cursor.tunnel, POINTER_AREA);
                                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, POINTER_TILE);
                                this->last_user_action = widget;
                                break;

                        default: NOT_REACHED();
                }
                this->UpdateRemoveWidgetStatus(widget);
                if (_ctrl_pressed) RailToolbar_CtrlChanged(this);
        }

        virtual EventState OnHotkey(int hotkey)
        {
                MarkTileDirtyByTile(TileVirtXY(_thd.pos.x, _thd.pos.y)); // redraw tile selection
                return Window::OnHotkey(hotkey);
        }

        virtual void OnPlaceObject(Point pt, TileIndex tile)
        {
                switch (this->last_user_action) {
                        case WID_RAT_BUILD_NS:
                        case WID_RAT_BUILD_X:
                        case WID_RAT_BUILD_EW:
                        case WID_RAT_BUILD_Y:
                        case WID_RAT_AUTORAIL:
                                VpStartPlaceSizing(tile, VPM_RAILDIRS, DRAG_PLACE_RAIL);
                                break;

                        case WID_RAT_DEMOLISH:
                                VpStartPlaceSizing(tile, VPM_X_AND_Y_ROTATED, DRAG_DEMOLISH_AREA);
                                break;

                        case WID_RAT_BUILD_DEPOT:
                                DoCommandP(tile, _cur_railtype, _build_depot_direction, CMD_BUILD_TRAIN_DEPOT);
                                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_RAILDIRS, DRAG_BUILD_SIGNALS);
                                break;

                        case WID_RAT_BUILD_BRIDGE:
                                if (IsBridgeHeadTile(tile)) {
                                        TileIndex other_tile = GetOtherBridgeEnd (tile);
                                        HandleBuildRailBridge (other_tile, tile);
                                } else {
                                        VpStartPlaceSizing (tile, VPM_X_OR_Y, DRAG_BUILD_BRIDGE);
                                }
                                break;

                        case WID_RAT_BUILD_TUNNEL:
                                DoCommandP(tile, _cur_railtype | (TRANSPORT_RAIL << 8), 0, CMD_BUILD_TUNNEL);
                                break;

                        case WID_RAT_CONVERT_RAIL:
                                VpStartPlaceSizing(tile, VPM_X_AND_Y_ROTATED, DRAG_CONVERT_RAIL);
                                break;

                        default: NOT_REACHED();
                }
        }

        bool OnPlaceDrag (int userdata, Point pt) OVERRIDE
        {
                /* no dragging if you have pressed the convert button */
                return (FindWindowById (WC_BUILD_SIGNAL, 0) == NULL)
                                || !_convert_signal_button
                                || !this->IsWidgetLowered (WID_RAT_BUILD_SIGNALS);
        }

        void OnPlaceMouseUp (int userdata, Point pt, TileIndex start_tile, TileIndex end_tile) OVERRIDE
        {
                if (pt.x != -1) {
                        switch (userdata) {
                                default: NOT_REACHED();
                                case DRAG_BUILD_BRIDGE:
                                        HandleBuildRailBridge (start_tile, end_tile);
                                        break;

                                case DRAG_PLACE_RAIL:
                                        HandleAutodirPlacement (start_tile, end_tile);
                                        break;

                                case DRAG_BUILD_SIGNALS:
                                        HandleAutoSignalPlacement (start_tile, end_tile);
                                        break;

                                case DRAG_DEMOLISH_AREA:
                                        HandleDemolishMouseUp (start_tile, end_tile);
                                        break;

                                case DRAG_CONVERT_RAIL:
                                        DoCommandP(end_tile, start_tile, _cur_railtype | (_ctrl_pressed ? 0x10 : 0), CMD_CONVERT_RAIL);
                                        break;

                                case DRAG_STATION:
                                        if (_remove_button_clicked) {
                                                DoCommandP (end_tile, start_tile, _ctrl_pressed ? 0 : 1, CMD_REMOVE_FROM_RAIL_STATION);
                                        } else {
                                                HandleStationPlacement (start_tile, end_tile);
                                        }
                                        break;

                                case DRAG_BUILD_WAYPOINT_X:
                                case DRAG_BUILD_WAYPOINT_Y: {
                                        TileArea ta (start_tile, end_tile);
                                        uint32 p1 = _cur_railtype | (userdata == DRAG_BUILD_WAYPOINT_X ? AXIS_X : AXIS_Y) << 4 | ta.w << 8 | ta.h << 16 | _ctrl_pressed << 24;
                                        uint32 p2 = STAT_CLASS_WAYP | _cur_waypoint_type << 8 | INVALID_STATION << 16;

                                        Command cmdcont (ta.tile, p1, p2, CMD_BUILD_RAIL_WAYPOINT);
                                        ShowSelectWaypointIfNeeded (&cmdcont, ta);
                                        break;
                                }

                                case DRAG_REMOVE_WAYPOINT:
                                        DoCommandP (end_tile, start_tile, _ctrl_pressed ? 0 : 1, CMD_REMOVE_FROM_RAIL_WAYPOINT);
                                        break;
                        }
                }
        }

        virtual void OnPlaceObjectAbort()
        {
                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 (TileIndex *tile, TileIndex *tile2) OVERRIDE
        {
                DoCommand (*tile, _cur_railtype | (TRANSPORT_RAIL << 8), 0, DC_AUTO, CMD_BUILD_TUNNEL);
                if (_build_tunnel_endtile != 0) *tile2 = _build_tunnel_endtile;
        }

        virtual EventState OnCTRLStateChange()
        {
                /* 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 == NULL) return ES_NOT_HANDLED;
        return w->OnHotkey(hotkey);
}

static const Hotkey railtoolbar_hotkeys[] = {
        Hotkey ("build_ns", WID_RAT_BUILD_NS,       '1'),
        Hotkey ("build_x",  WID_RAT_BUILD_X,        '2'),
        Hotkey ("build_ew", WID_RAT_BUILD_EW,       '3'),
        Hotkey ("build_y",  WID_RAT_BUILD_Y,        '4'),
        Hotkey ("autorail", WID_RAT_AUTORAIL,       '5', 'A' | WKC_GLOBAL_HOTKEY),
        Hotkey ("demolish", WID_RAT_DEMOLISH,       '6'),
        Hotkey ("depot",    WID_RAT_BUILD_DEPOT,    '7'),
        Hotkey ("waypoint", WID_RAT_BUILD_WAYPOINT, '8'),
        Hotkey ("station",  WID_RAT_BUILD_STATION,  '9'),
        Hotkey ("signal",   WID_RAT_BUILD_SIGNALS,  'S'),
        Hotkey ("bridge",   WID_RAT_BUILD_BRIDGE,   'B'),
        Hotkey ("tunnel",   WID_RAT_BUILD_TUNNEL,   'T'),
        Hotkey ("remove",   WID_RAT_REMOVE,         'R'),
        Hotkey ("convert",  WID_RAT_CONVERT_RAIL,   'C'),
};
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::Prefs _build_rail_prefs ("toolbar_rail");

static const WindowDesc _build_rail_desc(
        WDP_ALIGN_TOOLBAR, 0, 0,
        WC_BUILD_TOOLBAR, WC_NONE,
        WDF_CONSTRUCTION,
        _nested_build_rail_widgets, lengthof(_nested_build_rail_widgets),
        &_build_rail_prefs, &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 NULL if the toolbar could not be opened.
 */
Window *ShowBuildRailToolbar(RailType railtype)
{
        if (!Company::IsValidID(_local_company)) return NULL;
        if (!ValParamRailtype(railtype)) return NULL;

        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 << 4 | numtracks << 8 | platlength << 16 | _ctrl_pressed << 24;
        uint32 p2 = _railstation.station_class | _railstation.station_type << 8 | INVALID_STATION << 16;

        Command cmdcont (ta.tile, p1, p2, CMD_BUILD_RAIL_STATION);
        ShowSelectStationIfNeeded (&cmdcont, ta);
}

/** Check the selected number of tracks when turning drag&drop off. */
static void CheckPlatformWidth (const StationSpec *statspec)
{
        byte disallowed = statspec->disallowed_platforms;
        if (HasBit(disallowed, _settings_client.gui.station_numtracks - 1)) {
                /* The previously selected number of tracks is invalid. */
                for (uint i = 0; i < 7; i++) {
                        if (!HasBit(disallowed, i)) {
                                _settings_client.gui.station_numtracks = i + 1;
                                break;
                        }
                }
        }
}

/** Check the selected platform length when turning drag&drop off. */
static void CheckPlatformLength (const StationSpec *statspec)
{
        byte disallowed = statspec->disallowed_lengths;
        if (HasBit(disallowed, _settings_client.gui.station_platlength - 1)) {
                /* The previously selected number of platforms is invalid. */
                for (uint i = 0; i < 7; i++) {
                        if (!HasBit(disallowed, i)) {
                                _settings_client.gui.station_platlength = i + 1;
                                break;
                        }
                }
        }
}

/** Draw a station preview in a widget. */
static void DrawStationPreview (BlitArea *dpi, const Rect &r,
        StationClassID cls, uint type, uint image, bool check_avail)
{
        /* Set up a clipping area for the station preview. */
        BlitArea tmp_dpi;
        if (InitBlitArea (dpi, &tmp_dpi, r.left, r.top, r.right - r.left + 1, r.bottom - r.top + 1)) {
                int x = ScaleGUITrad(31) + 1;
                int y = r.bottom - r.top - ScaleGUITrad(31);
                if (!DrawStationTile (&tmp_dpi, x, y, _cur_railtype, (Axis)(image % 2), cls, type)) {
                        RailStationPickerDrawSprite (&tmp_dpi, x, y, cls == STAT_CLASS_WAYP, _cur_railtype, image);
                }
        }

        /* Check station availability callback */
        if (check_avail && !IsStationAvailable (StationClass::Get(cls)->GetSpec(type))) {
                GfxFillRect (dpi, r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK, FILLRECT_CHECKER);
        }
}

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 == NULL || _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 (const WindowDesc *desc, Window *parent, bool newstation) :
                PickerWindowBase (desc, parent), line_height (0),
                coverage_height (2 * FONT_HEIGHT_NORMAL + 3 * WD_PAR_VSEP_NORMAL),
                vscroll (NULL), vscroll2 (NULL)
        {
                _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->InitNested(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 = NULL;
                }
                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);
                }
        }

        void OnDelete (void) FINAL_OVERRIDE
        {
                DeleteWindowById(WC_SELECT_STATION, 0);
                this->PickerWindowBase::OnDelete();
        }

        void OnPaint (BlitArea *dpi) OVERRIDE
        {
                bool newstations = _railstation.newstations;
                const StationSpec *statspec = newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;

                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 == NULL) {
                                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 (dpi);

                /* '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 (dpi, left, right, top, rad);
                /* 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();
                }
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                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 != NULL && 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 (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                int widn = GB(widget, 0, 16);
                switch (widn) {
                        case WID_BRAS_PLATFORM_DIR_X:
                        case WID_BRAS_PLATFORM_DIR_Y:
                                assert_compile (WID_BRAS_PLATFORM_DIR_X == 0);
                                assert_compile (WID_BRAS_PLATFORM_DIR_Y == 1);
                                DrawStationPreview (dpi, r, _railstation.station_class, _railstation.station_type, 2 + widn, false);
                                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 (dpi, 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);
                                DrawStationPreview (dpi, r, _railstation.station_class, type, 2 + _railstation.orientation, true);
                                break;
                        }
                }
        }

        virtual void OnResize()
        {
                if (this->vscroll != NULL) { // New stations available.
                        this->vscroll->SetCapacityFromWidget(this, WID_BRAS_NEWST_LIST);
                }
        }

        virtual void SetStringParameters(int widget) const
        {
                if (widget == WID_BRAS_SHOW_NEWST_TYPE) {
                        const StationSpec *statspec = StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type);
                        SetDParam(0, (statspec != NULL && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
                }
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                enum {
                        CHANGED_NONE,  ///< Nothing changed.
                        CHANGED_DIRTY, ///< Play a sound and mark window dirty.
                        CHANGED_RESET, ///< The same, plus reset construction.
                } changed = CHANGED_NONE;

                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);
                                changed = CHANGED_RESET;
                                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) : NULL;
                                if (statspec != NULL) CheckPlatformLength (statspec);

                                this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
                                this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
                                changed = CHANGED_RESET;
                                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) : NULL;
                                if (statspec != NULL) CheckPlatformWidth (statspec);

                                this->LowerWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
                                this->LowerWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
                                changed = CHANGED_RESET;
                                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) : NULL;
                                if (statspec != NULL) {
                                        CheckPlatformLength (statspec);
                                        CheckPlatformWidth (statspec);
                                }

                                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);
                                changed = CHANGED_RESET;
                                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);
                                changed = CHANGED_DIRTY;
                                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);
                                                }
                                                changed = CHANGED_RESET;
                                                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);

                                changed = CHANGED_RESET;
                                break;
                        }
                }

                switch (changed) {
                        case CHANGED_RESET:
                                DeleteWindowById (WC_SELECT_STATION, 0);
                                SetStationTileSelectSize();
                                /* fall through */
                        case CHANGED_DIRTY:
                                if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
                                this->SetDirty();
                                /* fall through */
                        default: ;
                }
        }

        virtual void OnTick()
        {
                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(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(),
};

/** Window preferences of the station-build window (default & newGRF) */
static WindowDesc::Prefs _station_builder_prefs ("build_station_rail");

/** High level window description of the station-build window (default & newGRF) */
static const WindowDesc _station_builder_desc(
        WDP_AUTO, 350, 0,
        WC_BUILD_STATION, WC_BUILD_TOOLBAR,
        WDF_CONSTRUCTION,
        _nested_station_builder_widgets, lengthof(_nested_station_builder_widgets),
        &_station_builder_prefs
);

/** 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 (BlitArea *dpi, 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 (dpi, image, PAL_NONE,
                                x + this->IsWidgetLowered(widget_index),
                                y + this->IsWidgetLowered(widget_index));
        }

public:
        BuildSignalWindow (const WindowDesc *desc, Window *parent) :
                PickerWindowBase (desc, parent), sig_sprite_bottom_offset (0)
        {
                this->sig_sprite_size.width  = 0;
                this->sig_sprite_size.height = 0;

                this->InitNested(TRANSPORT_RAIL);
                this->OnInvalidateData();
        }

        void OnDelete (void) FINAL_OVERRIDE
        {
                _convert_signal_button = false;
                this->PickerWindowBase::OnDelete();
        }

        virtual void OnInit()
        {
                /* 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);
                                }
                        }
                }
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                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);
                }
        }

        virtual void SetStringParameters(int widget) const
        {
                switch (widget) {
                        case WID_BS_DRAG_SIGNALS_DENSITY_LABEL:
                                SetDParam(0, _settings_client.gui.drag_signals_density);
                                break;
                }
        }

        void DrawWidget (BlitArea *dpi, 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 (dpi, widget, sprite);
                }
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                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_END));
                                _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 != NULL) 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.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                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 preferences */
static WindowDesc::Prefs _signal_builder_prefs ("build_signal");

/** Signal selection window description */
static const WindowDesc _signal_builder_desc(
        WDP_AUTO, 0, 0,
        WC_BUILD_SIGNAL, WC_BUILD_TOOLBAR,
        WDF_CONSTRUCTION,
        _nested_signal_builder_widgets, lengthof(_nested_signal_builder_widgets),
        &_signal_builder_prefs
);

/**
 * Open the signal selection window
 */
static void ShowSignalBuilder(Window *parent)
{
        new BuildSignalWindow(&_signal_builder_desc, parent);
}

struct BuildRailDepotWindow : public PickerWindowBase {
        BuildRailDepotWindow (const WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
        {
                this->InitNested(TRANSPORT_RAIL);
                this->LowerWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                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 (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                if (!IsInsideMM(widget, WID_BRAD_DEPOT_NE, WID_BRAD_DEPOT_NW + 1)) return;

                DrawTrainDepotSprite (dpi, r.left + 1 + ScaleGUITrad(31), r.bottom - ScaleGUITrad(31), widget - WID_BRAD_DEPOT_NE + DIAGDIR_NE, _cur_railtype);
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                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 const WindowDesc _build_depot_desc(
        WDP_AUTO, 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 (const 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->InitNested(TRANSPORT_RAIL);

                matrix->SetCount(_waypoint_count);
                matrix->SetClicked(_cur_waypoint_type);
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                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 (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                switch (GB(widget, 0, 16)) {
                        case WID_BRW_WAYPOINT: {
                                byte type = GB(widget, 16, 16);
                                DrawStationPreview (dpi, r, STAT_CLASS_WAYP, type, AXIS_X, true);
                                break;
                        }
                }
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                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::Prefs _build_waypoint_prefs ("build_waypoint");

static const WindowDesc _build_waypoint_desc(
        WDP_AUTO, 0, 0,
        WC_BUILD_WAYPOINT, WC_BUILD_TOOLBAR,
        WDF_CONSTRUCTION,
        _nested_build_waypoint_widgets, lengthof(_nested_build_waypoint_widgets),
        &_build_waypoint_prefs
);

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 != NULL) 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 = (RailType)(_settings_client.gui.default_rail_type + RAILTYPE_END);
        if (rt == DEF_RAILTYPE_MOST_USED) {
                /* Find the most used rail type */
                RailType count[RAILTYPE_END];
                memset(count, 0, sizeof(count));
                for (TileIndex t = 0; t < MapSize(); t++) {
                        if (IsRailwayTile(t) || IsRailDepotTile(t) || IsLevelCrossingTile(t) || HasStationTileRail(t) ||
                                        maptile_is_rail_tunnel(t)) {
                                count[GetRailType(t)]++;
                        }
                }

                rt = RAILTYPE_RAIL;
                for (RailType r = RAILTYPE_ELECTRIC; r < RAILTYPE_END; r++) {
                        if (count[r] >= count[rt]) rt = r;
                }

                /* No rail, just get the first available one */
                if (count[rt] == 0) rt = DEF_RAILTYPE_FIRST;
        }
        switch (rt) {
                case DEF_RAILTYPE_FIRST:
                        rt = RAILTYPE_RAIL;
                        while (rt < RAILTYPE_END && !HasRailtypeAvail(_local_company, rt)) rt++;
                        break;

                case DEF_RAILTYPE_LAST:
                        rt = GetBestRailtype(_local_company);
                        break;

                default:
                        break;
        }

        _last_built_railtype = _cur_railtype = rt;
        BuildRailToolbarWindow *w = dynamic_cast<BuildRailToolbarWindow *>(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
        if (w != NULL) 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 != NULL) {
                        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_NONE;

        /* Find the used railtypes. */
        Engine *e;
        FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
                if (!HasBit(e->info.climates, _settings_game.game_creation.landscape)) continue;

                used_railtypes |= GetRailTypeInfo(e->u.rail.railtype)->introduces_railtypes;
        }

        /* Get the date introduced railtypes as well. */
        used_railtypes = AddDateIntroducedRailTypes(used_railtypes, MAX_DAY);

        const Company *c = Company::Get(_local_company);
        DropDownList *list = new DropDownList();

        if (all_option) {
                DropDownListStringItem *item = new DropDownListStringItem(STR_REPLACE_ALL_RAILTYPE, INVALID_RAILTYPE, false);
                *list->Append() = item;
        }

        RailType rt;
        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 = new DropDownListParamStringItem(str, rt, !HasBit(c->avail_railtypes, rt));
                item->SetParam(0, rti->strings.menu_text);
                item->SetParam(1, rti->max_speed);
                *list->Append() = item;
        }
        return list;
}