Codechange: Use null pointer literal instead of the NULL macro

[openttd-github.git] / src / town_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 town_gui.cpp GUI for towns. */

#include "stdafx.h"
#include "town.h"
#include "viewport_func.h"
#include "error.h"
#include "gui.h"
#include "command_func.h"
#include "company_func.h"
#include "company_base.h"
#include "company_gui.h"
#include "network/network.h"
#include "string_func.h"
#include "strings_func.h"
#include "sound_func.h"
#include "tilehighlight_func.h"
#include "sortlist_type.h"
#include "road_cmd.h"
#include "landscape.h"
#include "querystring_gui.h"
#include "window_func.h"
#include "townname_func.h"
#include "core/geometry_func.hpp"
#include "genworld.h"
#include "widgets/dropdown_func.h"

#include "widgets/town_widget.h"

#include "table/strings.h"

#include "safeguards.h"

typedef GUIList<const Town*> GUITownList;

static const NWidgetPart _nested_town_authority_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TA_CAPTION), SetDataTip(STR_LOCAL_AUTHORITY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_BROWN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
                NWidget(WWT_STICKYBOX, COLOUR_BROWN),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_RATING_INFO), SetMinimalSize(317, 92), SetResize(1, 1), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_COMMAND_LIST), SetMinimalSize(305, 52), SetResize(1, 0), SetDataTip(0x0, STR_LOCAL_AUTHORITY_ACTIONS_TOOLTIP), SetScrollbar(WID_TA_SCROLLBAR), EndContainer(),
                NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_TA_SCROLLBAR),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_ACTION_INFO), SetMinimalSize(317, 52), SetResize(1, 0), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TA_EXECUTE),  SetMinimalSize(317, 12), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_LOCAL_AUTHORITY_DO_IT_BUTTON, STR_LOCAL_AUTHORITY_DO_IT_TOOLTIP),
                NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
        EndContainer()
};

/** Town authority window. */
struct TownAuthorityWindow : Window {
private:
        Town *town;    ///< Town being displayed.
        int sel_index; ///< Currently selected town action, \c 0 to \c TACT_COUNT-1, \c -1 means no action selected.
        Scrollbar *vscroll;
        uint displayed_actions_on_previous_painting; ///< Actions that were available on the previous call to OnPaint()

        /**
         * Get the position of the Nth set bit.
         *
         * If there is no Nth bit set return -1
         *
         * @param bits The value to search in
         * @param n The Nth set bit from which we want to know the position
         * @return The position of the Nth set bit
         */
        static int GetNthSetBit(uint32 bits, int n)
        {
                if (n >= 0) {
                        uint i;
                        FOR_EACH_SET_BIT(i, bits) {
                                n--;
                                if (n < 0) return i;
                        }
                }
                return -1;
        }

public:
        TownAuthorityWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc), sel_index(-1), displayed_actions_on_previous_painting(0)
        {
                this->town = Town::Get(window_number);
                this->InitNested(window_number);
                this->vscroll = this->GetScrollbar(WID_TA_SCROLLBAR);
                this->vscroll->SetCapacity((this->GetWidget<NWidgetBase>(WID_TA_COMMAND_LIST)->current_y - WD_FRAMERECT_TOP - WD_FRAMERECT_BOTTOM) / FONT_HEIGHT_NORMAL);
        }

        void OnPaint() override
        {
                int numact;
                uint buttons = GetMaskOfTownActions(&numact, _local_company, this->town);
                if (buttons != displayed_actions_on_previous_painting) this->SetDirty();
                displayed_actions_on_previous_painting = buttons;

                this->vscroll->SetCount(numact + 1);

                if (this->sel_index != -1 && !HasBit(buttons, this->sel_index)) {
                        this->sel_index = -1;
                }

                this->SetWidgetDisabledState(WID_TA_EXECUTE, this->sel_index == -1);

                this->DrawWidgets();
                if (!this->IsShaded()) this->DrawRatings();
        }

        /** Draw the contents of the ratings panel. May request a resize of the window if the contents does not fit. */
        void DrawRatings()
        {
                NWidgetBase *nwid = this->GetWidget<NWidgetBase>(WID_TA_RATING_INFO);
                uint left = nwid->pos_x + WD_FRAMERECT_LEFT;
                uint right = nwid->pos_x + nwid->current_x - 1 - WD_FRAMERECT_RIGHT;

                uint y = nwid->pos_y + WD_FRAMERECT_TOP;

                DrawString(left, right, y, STR_LOCAL_AUTHORITY_COMPANY_RATINGS);
                y += FONT_HEIGHT_NORMAL;

                Dimension icon_size = GetSpriteSize(SPR_COMPANY_ICON);
                int icon_width      = icon_size.width;
                int icon_y_offset   = (FONT_HEIGHT_NORMAL - icon_size.height) / 2;

                Dimension exclusive_size = GetSpriteSize(SPR_EXCLUSIVE_TRANSPORT);
                int exclusive_width      = exclusive_size.width;
                int exclusive_y_offset   = (FONT_HEIGHT_NORMAL - exclusive_size.height) / 2;

                bool rtl = _current_text_dir == TD_RTL;
                uint text_left      = left  + (rtl ? 0 : icon_width + exclusive_width + 4);
                uint text_right     = right - (rtl ? icon_width + exclusive_width + 4 : 0);
                uint icon_left      = rtl ? right - icon_width : left;
                uint exclusive_left = rtl ? right - icon_width - exclusive_width - 2 : left + icon_width + 2;

                /* Draw list of companies */
                const Company *c;
                FOR_ALL_COMPANIES(c) {
                        if ((HasBit(this->town->have_ratings, c->index) || this->town->exclusivity == c->index)) {
                                DrawCompanyIcon(c->index, icon_left, y + icon_y_offset);

                                SetDParam(0, c->index);
                                SetDParam(1, c->index);

                                int r = this->town->ratings[c->index];
                                StringID str = STR_CARGO_RATING_APPALLING;
                                if (r > RATING_APPALLING) str++;
                                if (r > RATING_VERYPOOR)  str++;
                                if (r > RATING_POOR)      str++;
                                if (r > RATING_MEDIOCRE)  str++;
                                if (r > RATING_GOOD)      str++;
                                if (r > RATING_VERYGOOD)  str++;
                                if (r > RATING_EXCELLENT) str++;

                                SetDParam(2, str);
                                if (this->town->exclusivity == c->index) {
                                        DrawSprite(SPR_EXCLUSIVE_TRANSPORT, COMPANY_SPRITE_COLOUR(c->index), exclusive_left, y + exclusive_y_offset);
                                }

                                DrawString(text_left, text_right, y, STR_LOCAL_AUTHORITY_COMPANY_RATING);
                                y += FONT_HEIGHT_NORMAL;
                        }
                }

                y = y + WD_FRAMERECT_BOTTOM - nwid->pos_y; // Compute needed size of the widget.
                if (y > nwid->current_y) {
                        /* If the company list is too big to fit, mark ourself dirty and draw again. */
                        ResizeWindow(this, 0, y - nwid->current_y, false);
                }
        }

        void SetStringParameters(int widget) const override
        {
                if (widget == WID_TA_CAPTION) SetDParam(0, this->window_number);
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                switch (widget) {
                        case WID_TA_ACTION_INFO:
                                if (this->sel_index != -1) {
                                        SetDParam(0, _price[PR_TOWN_ACTION] * _town_action_costs[this->sel_index] >> 8);
                                        DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, r.bottom - WD_FRAMERECT_BOTTOM,
                                                                STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_SMALL_ADVERTISING + this->sel_index);
                                }
                                break;
                        case WID_TA_COMMAND_LIST: {
                                int numact;
                                uint buttons = GetMaskOfTownActions(&numact, _local_company, this->town);
                                int y = r.top + WD_FRAMERECT_TOP;
                                int pos = this->vscroll->GetPosition();

                                if (--pos < 0) {
                                        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_LOCAL_AUTHORITY_ACTIONS_TITLE);
                                        y += FONT_HEIGHT_NORMAL;
                                }

                                for (int i = 0; buttons; i++, buttons >>= 1) {
                                        if (pos <= -5) break; ///< Draw only the 5 fitting lines

                                        if ((buttons & 1) && --pos < 0) {
                                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y,
                                                                STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + i, this->sel_index == i ? TC_WHITE : TC_ORANGE);
                                                y += FONT_HEIGHT_NORMAL;
                                        }
                                }
                                break;
                        }
                }
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_TA_ACTION_INFO: {
                                assert(size->width > padding.width && size->height > padding.height);
                                size->width -= WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                size->height -= WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
                                Dimension d = {0, 0};
                                for (int i = 0; i < TACT_COUNT; i++) {
                                        SetDParam(0, _price[PR_TOWN_ACTION] * _town_action_costs[i] >> 8);
                                        d = maxdim(d, GetStringMultiLineBoundingBox(STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_SMALL_ADVERTISING + i, *size));
                                }
                                *size = maxdim(*size, d);
                                size->width += WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                size->height += WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
                                break;
                        }

                        case WID_TA_COMMAND_LIST:
                                size->height = WD_FRAMERECT_TOP + 5 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM;
                                size->width = GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTIONS_TITLE).width;
                                for (uint i = 0; i < TACT_COUNT; i++ ) {
                                        size->width = max(size->width, GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + i).width);
                                }
                                size->width += WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                break;

                        case WID_TA_RATING_INFO:
                                resize->height = FONT_HEIGHT_NORMAL;
                                size->height = WD_FRAMERECT_TOP + 9 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM;
                                break;
                }
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_TA_COMMAND_LIST: {
                                int y = this->GetRowFromWidget(pt.y, WID_TA_COMMAND_LIST, 1, FONT_HEIGHT_NORMAL);
                                if (!IsInsideMM(y, 0, 5)) return;

                                y = GetNthSetBit(GetMaskOfTownActions(nullptr, _local_company, this->town), y + this->vscroll->GetPosition() - 1);
                                if (y >= 0) {
                                        this->sel_index = y;
                                        this->SetDirty();
                                }
                                /* When double-clicking, continue */
                                if (click_count == 1 || y < 0) break;
                                FALLTHROUGH;
                        }

                        case WID_TA_EXECUTE:
                                DoCommandP(this->town->xy, this->window_number, this->sel_index, CMD_DO_TOWN_ACTION | CMD_MSG(STR_ERROR_CAN_T_DO_THIS));
                                break;
                }
        }

        void OnHundredthTick() override
        {
                this->SetDirty();
        }
};

static WindowDesc _town_authority_desc(
        WDP_AUTO, "view_town_authority", 317, 222,
        WC_TOWN_AUTHORITY, WC_NONE,
        0,
        _nested_town_authority_widgets, lengthof(_nested_town_authority_widgets)
);

static void ShowTownAuthorityWindow(uint town)
{
        AllocateWindowDescFront<TownAuthorityWindow>(&_town_authority_desc, town);
}


/* Town view window. */
struct TownViewWindow : Window {
private:
        Town *town; ///< Town displayed by the window.

public:
        static const int WID_TV_HEIGHT_NORMAL = 150;

        TownViewWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
        {
                this->CreateNestedTree();

                this->town = Town::Get(window_number);
                if (this->town->larger_town) this->GetWidget<NWidgetCore>(WID_TV_CAPTION)->widget_data = STR_TOWN_VIEW_CITY_CAPTION;

                this->FinishInitNested(window_number);

                this->flags |= WF_DISABLE_VP_SCROLL;
                NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_TV_VIEWPORT);
                nvp->InitializeViewport(this, this->town->xy, ZOOM_LVL_NEWS);

                /* disable renaming town in network games if you are not the server */
                this->SetWidgetDisabledState(WID_TV_CHANGE_NAME, _networking && !_network_server);
        }

        void SetStringParameters(int widget) const override
        {
                if (widget == WID_TV_CAPTION) SetDParam(0, this->town->index);
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                if (widget != WID_TV_INFO) return;

                uint y = r.top + WD_FRAMERECT_TOP;

                SetDParam(0, this->town->cache.population);
                SetDParam(1, this->town->cache.num_houses);
                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y, STR_TOWN_VIEW_POPULATION_HOUSES);

                SetDParam(0, 1 << CT_PASSENGERS);
                SetDParam(1, this->town->supplied[CT_PASSENGERS].old_act);
                SetDParam(2, this->town->supplied[CT_PASSENGERS].old_max);
                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_CARGO_LAST_MONTH_MAX);

                SetDParam(0, 1 << CT_MAIL);
                SetDParam(1, this->town->supplied[CT_MAIL].old_act);
                SetDParam(2, this->town->supplied[CT_MAIL].old_max);
                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_CARGO_LAST_MONTH_MAX);

                bool first = true;
                for (int i = TE_BEGIN; i < TE_END; i++) {
                        if (this->town->goal[i] == 0) continue;
                        if (this->town->goal[i] == TOWN_GROWTH_WINTER && (TileHeight(this->town->xy) < LowestSnowLine() || this->town->cache.population <= 90)) continue;
                        if (this->town->goal[i] == TOWN_GROWTH_DESERT && (GetTropicZone(this->town->xy) != TROPICZONE_DESERT || this->town->cache.population <= 60)) continue;

                        if (first) {
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH);
                                first = false;
                        }

                        bool rtl = _current_text_dir == TD_RTL;
                        uint cargo_text_left = r.left + WD_FRAMERECT_LEFT + (rtl ? 0 : 20);
                        uint cargo_text_right = r.right - WD_FRAMERECT_RIGHT - (rtl ? 20 : 0);

                        const CargoSpec *cargo = FindFirstCargoWithTownEffect((TownEffect)i);
                        assert(cargo != nullptr);

                        StringID string;

                        if (this->town->goal[i] == TOWN_GROWTH_DESERT || this->town->goal[i] == TOWN_GROWTH_WINTER) {
                                /* For 'original' gameplay, don't show the amount required (you need 1 or more ..) */
                                string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_DELIVERED_GENERAL;
                                if (this->town->received[i].old_act == 0) {
                                        string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED_GENERAL;

                                        if (this->town->goal[i] == TOWN_GROWTH_WINTER && TileHeight(this->town->xy) < GetSnowLine()) {
                                                string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED_WINTER;
                                        }
                                }

                                SetDParam(0, cargo->name);
                        } else {
                                string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_DELIVERED;
                                if (this->town->received[i].old_act < this->town->goal[i]) {
                                        string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED;
                                }

                                SetDParam(0, cargo->Index());
                                SetDParam(1, this->town->received[i].old_act);
                                SetDParam(2, cargo->Index());
                                SetDParam(3, this->town->goal[i]);
                        }
                        DrawString(cargo_text_left, cargo_text_right, y += FONT_HEIGHT_NORMAL, string);
                }

                if (HasBit(this->town->flags, TOWN_IS_GROWING)) {
                        SetDParam(0, RoundDivSU(this->town->growth_rate + 1, DAY_TICKS));
                        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, this->town->fund_buildings_months == 0 ? STR_TOWN_VIEW_TOWN_GROWS_EVERY : STR_TOWN_VIEW_TOWN_GROWS_EVERY_FUNDED);
                } else {
                        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_TOWN_GROW_STOPPED);
                }

                /* only show the town noise, if the noise option is activated. */
                if (_settings_game.economy.station_noise_level) {
                        SetDParam(0, this->town->noise_reached);
                        SetDParam(1, this->town->MaxTownNoise());
                        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_LEFT, y += FONT_HEIGHT_NORMAL, STR_TOWN_VIEW_NOISE_IN_TOWN);
                }

                if (this->town->text != nullptr) {
                        SetDParamStr(0, this->town->text);
                        DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y += FONT_HEIGHT_NORMAL, UINT16_MAX, STR_JUST_RAW_STRING, TC_BLACK);
                }
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_TV_CENTER_VIEW: // scroll to location
                                if (_ctrl_pressed) {
                                        ShowExtraViewPortWindow(this->town->xy);
                                } else {
                                        ScrollMainWindowToTile(this->town->xy);
                                }
                                break;

                        case WID_TV_SHOW_AUTHORITY: // town authority
                                ShowTownAuthorityWindow(this->window_number);
                                break;

                        case WID_TV_CHANGE_NAME: // rename
                                SetDParam(0, this->window_number);
                                ShowQueryString(STR_TOWN_NAME, STR_TOWN_VIEW_RENAME_TOWN_BUTTON, MAX_LENGTH_TOWN_NAME_CHARS, this, CS_ALPHANUMERAL, QSF_ENABLE_DEFAULT | QSF_LEN_IN_CHARS);
                                break;

                        case WID_TV_EXPAND: { // expand town - only available on Scenario editor
                                /* Warn the user if towns are not allowed to build roads, but do this only once per OpenTTD run. */
                                static bool _warn_town_no_roads = false;

                                if (!_settings_game.economy.allow_town_roads && !_warn_town_no_roads) {
                                        ShowErrorMessage(STR_ERROR_TOWN_EXPAND_WARN_NO_ROADS, INVALID_STRING_ID, WL_WARNING);
                                        _warn_town_no_roads = true;
                                }

                                DoCommandP(0, this->window_number, 0, CMD_EXPAND_TOWN | CMD_MSG(STR_ERROR_CAN_T_EXPAND_TOWN));
                                break;
                        }

                        case WID_TV_DELETE: // delete town - only available on Scenario editor
                                DoCommandP(0, this->window_number, 0, CMD_DELETE_TOWN | CMD_MSG(STR_ERROR_TOWN_CAN_T_DELETE));
                                break;
                }
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_TV_INFO:
                                size->height = GetDesiredInfoHeight(size->width);
                                break;
                }
        }

        /**
         * Gets the desired height for the information panel.
         * @return the desired height in pixels.
         */
        uint GetDesiredInfoHeight(int width) const
        {
                uint aimed_height = 3 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;

                bool first = true;
                for (int i = TE_BEGIN; i < TE_END; i++) {
                        if (this->town->goal[i] == 0) continue;
                        if (this->town->goal[i] == TOWN_GROWTH_WINTER && (TileHeight(this->town->xy) < LowestSnowLine() || this->town->cache.population <= 90)) continue;
                        if (this->town->goal[i] == TOWN_GROWTH_DESERT && (GetTropicZone(this->town->xy) != TROPICZONE_DESERT || this->town->cache.population <= 60)) continue;

                        if (first) {
                                aimed_height += FONT_HEIGHT_NORMAL;
                                first = false;
                        }
                        aimed_height += FONT_HEIGHT_NORMAL;
                }
                aimed_height += FONT_HEIGHT_NORMAL;

                if (_settings_game.economy.station_noise_level) aimed_height += FONT_HEIGHT_NORMAL;

                if (this->town->text != nullptr) {
                        SetDParamStr(0, this->town->text);
                        aimed_height += GetStringHeight(STR_JUST_RAW_STRING, width - WD_FRAMERECT_LEFT - WD_FRAMERECT_RIGHT);
                }

                return aimed_height;
        }

        void ResizeWindowAsNeeded()
        {
                const NWidgetBase *nwid_info = this->GetWidget<NWidgetBase>(WID_TV_INFO);
                uint aimed_height = GetDesiredInfoHeight(nwid_info->current_x);
                if (aimed_height > nwid_info->current_y || (aimed_height < nwid_info->current_y && nwid_info->current_y > nwid_info->smallest_y)) {
                        this->ReInit();
                }
        }

        void OnResize() override
        {
                if (this->viewport != nullptr) {
                        NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_TV_VIEWPORT);
                        nvp->UpdateViewportCoordinates(this);

                        ScrollWindowToTile(this->town->xy, this, true); // Re-center viewport.
                }
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (!gui_scope) return;
                /* Called when setting station noise or required cargoes have changed, in order to resize the window */
                this->SetDirty(); // refresh display for current size. This will allow to avoid glitches when downgrading
                this->ResizeWindowAsNeeded();
        }

        void OnQueryTextFinished(char *str) override
        {
                if (str == nullptr) return;

                DoCommandP(0, this->window_number, 0, CMD_RENAME_TOWN | CMD_MSG(STR_ERROR_CAN_T_RENAME_TOWN), nullptr, str);
        }
};

static const NWidgetPart _nested_town_game_view_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION), SetDataTip(STR_TOWN_VIEW_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_BROWN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
                NWidget(WWT_STICKYBOX, COLOUR_BROWN),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN),
                NWidget(WWT_INSET, COLOUR_BROWN), SetPadding(2, 2, 2, 2),
                        NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_TV_VIEWPORT), SetMinimalSize(254, 86), SetFill(1, 0), SetResize(1, 1), SetPadding(1, 1, 1, 1),
                EndContainer(),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN, WID_TV_INFO), SetMinimalSize(260, 32), SetResize(1, 0), SetFill(1, 0), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_BUTTON_LOCATION, STR_TOWN_VIEW_CENTER_TOOLTIP),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_SHOW_AUTHORITY), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_TOWN_VIEW_LOCAL_AUTHORITY_BUTTON, STR_TOWN_VIEW_LOCAL_AUTHORITY_TOOLTIP),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_CHANGE_NAME), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_BUTTON_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
                EndContainer(),
                NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
        EndContainer(),
};

static WindowDesc _town_game_view_desc(
        WDP_AUTO, "view_town", 260, TownViewWindow::WID_TV_HEIGHT_NORMAL,
        WC_TOWN_VIEW, WC_NONE,
        0,
        _nested_town_game_view_widgets, lengthof(_nested_town_game_view_widgets)
);

static const NWidgetPart _nested_town_editor_view_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION), SetDataTip(STR_TOWN_VIEW_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_CHANGE_NAME), SetMinimalSize(76, 14), SetDataTip(STR_BUTTON_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
                NWidget(WWT_SHADEBOX, COLOUR_BROWN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
                NWidget(WWT_STICKYBOX, COLOUR_BROWN),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN),
                NWidget(WWT_INSET, COLOUR_BROWN), SetPadding(2, 2, 2, 2),
                        NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_TV_VIEWPORT), SetMinimalSize(254, 86), SetFill(1, 1), SetResize(1, 1), SetPadding(1, 1, 1, 1),
                EndContainer(),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_BROWN, WID_TV_INFO), SetMinimalSize(260, 32), SetResize(1, 0), SetFill(1, 0), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_BUTTON_LOCATION, STR_TOWN_VIEW_CENTER_TOOLTIP),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_EXPAND), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_TOWN_VIEW_EXPAND_BUTTON, STR_TOWN_VIEW_EXPAND_TOOLTIP),
                        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_DELETE), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_TOWN_VIEW_DELETE_BUTTON, STR_TOWN_VIEW_DELETE_TOOLTIP),
                EndContainer(),
                NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
        EndContainer(),
};

static WindowDesc _town_editor_view_desc(
        WDP_AUTO, "view_town_scen", 260, TownViewWindow::WID_TV_HEIGHT_NORMAL,
        WC_TOWN_VIEW, WC_NONE,
        0,
        _nested_town_editor_view_widgets, lengthof(_nested_town_editor_view_widgets)
);

void ShowTownViewWindow(TownID town)
{
        if (_game_mode == GM_EDITOR) {
                AllocateWindowDescFront<TownViewWindow>(&_town_editor_view_desc, town);
        } else {
                AllocateWindowDescFront<TownViewWindow>(&_town_game_view_desc, town);
        }
}

static const NWidgetPart _nested_town_directory_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_TOWN_DIRECTORY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_BROWN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
                NWidget(WWT_STICKYBOX, COLOUR_BROWN),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_HORIZONTAL),
                                NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TD_SORT_ORDER), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
                                NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_TD_SORT_CRITERIA), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_SORT_CRITERIA),
                                NWidget(WWT_PANEL, COLOUR_BROWN), SetResize(1, 0), EndContainer(),
                        EndContainer(),
                        NWidget(WWT_PANEL, COLOUR_BROWN, WID_TD_LIST), SetMinimalSize(196, 0), SetDataTip(0x0, STR_TOWN_DIRECTORY_LIST_TOOLTIP),
                                                        SetFill(1, 0), SetResize(0, 10), SetScrollbar(WID_TD_SCROLLBAR), EndContainer(),
                        NWidget(WWT_PANEL, COLOUR_BROWN),
                                NWidget(WWT_TEXT, COLOUR_BROWN, WID_TD_WORLD_POPULATION), SetPadding(2, 0, 0, 2), SetMinimalSize(196, 12), SetFill(1, 0), SetDataTip(STR_TOWN_POPULATION, STR_NULL),
                        EndContainer(),
                EndContainer(),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_TD_SCROLLBAR),
                        NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
                EndContainer(),
        EndContainer(),
};

/** Town directory window class. */
struct TownDirectoryWindow : public Window {
private:
        /* Runtime saved values */
        static Listing last_sorting;
        static const Town *last_town;

        /* Constants for sorting towns */
        static const StringID sorter_names[];
        static GUITownList::SortFunction * const sorter_funcs[];

        GUITownList towns;

        Scrollbar *vscroll;

        void BuildSortTownList()
        {
                if (this->towns.NeedRebuild()) {
                        this->towns.clear();

                        const Town *t;
                        FOR_ALL_TOWNS(t) {
                                this->towns.push_back(t);
                        }

                        this->towns.shrink_to_fit();
                        this->towns.RebuildDone();
                        this->vscroll->SetCount((uint)this->towns.size()); // Update scrollbar as well.
                }
                /* Always sort the towns. */
                this->last_town = nullptr;
                this->towns.Sort();
                this->SetWidgetDirty(WID_TD_LIST); // Force repaint of the displayed towns.
        }

        /** Sort by town name */
        static int CDECL TownNameSorter(const Town * const *a, const Town * const *b)
        {
                static char buf_cache[64];
                const Town *ta = *a;
                const Town *tb = *b;
                char buf[64];

                SetDParam(0, ta->index);
                GetString(buf, STR_TOWN_NAME, lastof(buf));

                /* If 'b' is the same town as in the last round, use the cached value
                 * We do this to speed stuff up ('b' is called with the same value a lot of
                 * times after each other) */
                if (tb != last_town) {
                        last_town = tb;
                        SetDParam(0, tb->index);
                        GetString(buf_cache, STR_TOWN_NAME, lastof(buf_cache));
                }

                return strnatcmp(buf, buf_cache); // Sort by name (natural sorting).
        }

        /** Sort by population (default descending, as big towns are of the most interest). */
        static int CDECL TownPopulationSorter(const Town * const *a, const Town * const *b)
        {
                uint32 a_population = (*a)->cache.population;
                uint32 b_population = (*b)->cache.population;
                if (a_population == b_population) return TownDirectoryWindow::TownNameSorter(a, b);
                return (a_population < b_population) ? -1 : 1;
        }

        /** Sort by town rating */
        static int CDECL TownRatingSorter(const Town * const *a, const Town * const *b)
        {
                int before = TownDirectoryWindow::last_sorting.order ? 1 : -1; // Value to get 'a' before 'b'.

                /* Towns without rating are always after towns with rating. */
                if (HasBit((*a)->have_ratings, _local_company)) {
                        if (HasBit((*b)->have_ratings, _local_company)) {
                                int16 a_rating = (*a)->ratings[_local_company];
                                int16 b_rating = (*b)->ratings[_local_company];
                                if (a_rating == b_rating) return TownDirectoryWindow::TownNameSorter(a, b);
                                return (a_rating < b_rating) ? -1 : 1;
                        }
                        return before;
                }
                if (HasBit((*b)->have_ratings, _local_company)) return -before;
                return -before * TownDirectoryWindow::TownNameSorter(a, b); // Sort unrated towns always on ascending town name.
        }

public:
        TownDirectoryWindow(WindowDesc *desc) : Window(desc)
        {
                this->CreateNestedTree();

                this->vscroll = this->GetScrollbar(WID_TD_SCROLLBAR);

                this->towns.SetListing(this->last_sorting);
                this->towns.SetSortFuncs(TownDirectoryWindow::sorter_funcs);
                this->towns.ForceRebuild();
                this->BuildSortTownList();

                this->FinishInitNested(0);
        }

        void SetStringParameters(int widget) const override
        {
                switch (widget) {
                        case WID_TD_WORLD_POPULATION:
                                SetDParam(0, GetWorldPopulation());
                                break;

                        case WID_TD_SORT_CRITERIA:
                                SetDParam(0, TownDirectoryWindow::sorter_names[this->towns.SortType()]);
                                break;
                }
        }

        /**
         * Get the string to draw the town name.
         * @param t Town to draw.
         * @return The string to use.
         */
        static StringID GetTownString(const Town *t)
        {
                return t->larger_town ? STR_TOWN_DIRECTORY_CITY : STR_TOWN_DIRECTORY_TOWN;
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                switch (widget) {
                        case WID_TD_SORT_ORDER:
                                this->DrawSortButtonState(widget, this->towns.IsDescSortOrder() ? SBS_DOWN : SBS_UP);
                                break;

                        case WID_TD_LIST: {
                                int n = 0;
                                int y = r.top + WD_FRAMERECT_TOP;
                                if (this->towns.size() == 0) { // No towns available.
                                        DrawString(r.left + WD_FRAMERECT_LEFT, r.right, y, STR_TOWN_DIRECTORY_NONE);
                                        break;
                                }

                                /* At least one town available. */
                                bool rtl = _current_text_dir == TD_RTL;
                                Dimension icon_size = GetSpriteSize(SPR_TOWN_RATING_GOOD);
                                int text_left  = r.left + WD_FRAMERECT_LEFT + (rtl ? 0 : icon_size.width + 2);
                                int text_right = r.right - WD_FRAMERECT_RIGHT - (rtl ? icon_size.width + 2 : 0);
                                int icon_x = rtl ? r.right - WD_FRAMERECT_RIGHT - icon_size.width : r.left + WD_FRAMERECT_LEFT;

                                for (uint i = this->vscroll->GetPosition(); i < this->towns.size(); i++) {
                                        const Town *t = this->towns[i];
                                        assert(t->xy != INVALID_TILE);

                                        /* Draw rating icon. */
                                        if (_game_mode == GM_EDITOR || !HasBit(t->have_ratings, _local_company)) {
                                                DrawSprite(SPR_TOWN_RATING_NA, PAL_NONE, icon_x, y + (this->resize.step_height - icon_size.height) / 2);
                                        } else {
                                                SpriteID icon = SPR_TOWN_RATING_APALLING;
                                                if (t->ratings[_local_company] > RATING_VERYPOOR) icon = SPR_TOWN_RATING_MEDIOCRE;
                                                if (t->ratings[_local_company] > RATING_GOOD)     icon = SPR_TOWN_RATING_GOOD;
                                                DrawSprite(icon, PAL_NONE, icon_x, y + (this->resize.step_height - icon_size.height) / 2);
                                        }

                                        SetDParam(0, t->index);
                                        SetDParam(1, t->cache.population);
                                        DrawString(text_left, text_right, y + (this->resize.step_height - FONT_HEIGHT_NORMAL) / 2, GetTownString(t));

                                        y += this->resize.step_height;
                                        if (++n == this->vscroll->GetCapacity()) break; // max number of towns in 1 window
                                }
                                break;
                        }
                }
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_TD_SORT_ORDER: {
                                Dimension d = GetStringBoundingBox(this->GetWidget<NWidgetCore>(widget)->widget_data);
                                d.width += padding.width + Window::SortButtonWidth() * 2; // Doubled since the string is centred and it also looks better.
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }
                        case WID_TD_SORT_CRITERIA: {
                                Dimension d = {0, 0};
                                for (uint i = 0; TownDirectoryWindow::sorter_names[i] != INVALID_STRING_ID; i++) {
                                        d = maxdim(d, GetStringBoundingBox(TownDirectoryWindow::sorter_names[i]));
                                }
                                d.width += padding.width;
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }
                        case WID_TD_LIST: {
                                Dimension d = GetStringBoundingBox(STR_TOWN_DIRECTORY_NONE);
                                for (uint i = 0; i < this->towns.size(); i++) {
                                        const Town *t = this->towns[i];

                                        assert(t != nullptr);

                                        SetDParam(0, t->index);
                                        SetDParamMaxDigits(1, 8);
                                        d = maxdim(d, GetStringBoundingBox(GetTownString(t)));
                                }
                                Dimension icon_size = GetSpriteSize(SPR_TOWN_RATING_GOOD);
                                d.width += icon_size.width + 2;
                                d.height = max(d.height, icon_size.height);
                                resize->height = d.height;
                                d.height *= 5;
                                d.width += padding.width + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                d.height += padding.height + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
                                *size = maxdim(*size, d);
                                break;
                        }
                        case WID_TD_WORLD_POPULATION: {
                                SetDParamMaxDigits(0, 10);
                                Dimension d = GetStringBoundingBox(STR_TOWN_POPULATION);
                                d.width += padding.width;
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }
                }
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_TD_SORT_ORDER: // Click on sort order button
                                if (this->towns.SortType() != 2) { // A different sort than by rating.
                                        this->towns.ToggleSortOrder();
                                        this->last_sorting = this->towns.GetListing(); // Store new sorting order.
                                } else {
                                        /* Some parts are always sorted ascending on name. */
                                        this->last_sorting.order = !this->last_sorting.order;
                                        this->towns.SetListing(this->last_sorting);
                                        this->towns.ForceResort();
                                        this->towns.Sort();
                                }
                                this->SetDirty();
                                break;

                        case WID_TD_SORT_CRITERIA: // Click on sort criteria dropdown
                                ShowDropDownMenu(this, TownDirectoryWindow::sorter_names, this->towns.SortType(), WID_TD_SORT_CRITERIA, 0, 0);
                                break;

                        case WID_TD_LIST: { // Click on Town Matrix
                                uint id_v = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_TD_LIST, WD_FRAMERECT_TOP);
                                if (id_v >= this->towns.size()) return; // click out of town bounds

                                const Town *t = this->towns[id_v];
                                assert(t != nullptr);
                                if (_ctrl_pressed) {
                                        ShowExtraViewPortWindow(t->xy);
                                } else {
                                        ScrollMainWindowToTile(t->xy);
                                }
                                break;
                        }
                }
        }

        void OnDropdownSelect(int widget, int index) override
        {
                if (widget != WID_TD_SORT_CRITERIA) return;

                if (this->towns.SortType() != index) {
                        this->towns.SetSortType(index);
                        this->last_sorting = this->towns.GetListing(); // Store new sorting order.
                        this->BuildSortTownList();
                }
        }

        void OnPaint() override
        {
                if (this->towns.NeedRebuild()) this->BuildSortTownList();
                this->DrawWidgets();
        }

        void OnHundredthTick() override
        {
                this->BuildSortTownList();
                this->SetDirty();
        }

        void OnResize() override
        {
                this->vscroll->SetCapacityFromWidget(this, WID_TD_LIST);
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (data == 0) {
                        /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
                        this->towns.ForceRebuild();
                } else {
                        this->towns.ForceResort();
                }
        }
};

Listing TownDirectoryWindow::last_sorting = {false, 0};
const Town *TownDirectoryWindow::last_town = nullptr;

/** Names of the sorting functions. */
const StringID TownDirectoryWindow::sorter_names[] = {
        STR_SORT_BY_NAME,
        STR_SORT_BY_POPULATION,
        STR_SORT_BY_RATING,
        INVALID_STRING_ID
};

/** Available town directory sorting functions. */
GUITownList::SortFunction * const TownDirectoryWindow::sorter_funcs[] = {
        &TownNameSorter,
        &TownPopulationSorter,
        &TownRatingSorter,
};

static WindowDesc _town_directory_desc(
        WDP_AUTO, "list_towns", 208, 202,
        WC_TOWN_DIRECTORY, WC_NONE,
        0,
        _nested_town_directory_widgets, lengthof(_nested_town_directory_widgets)
);

void ShowTownDirectory()
{
        if (BringWindowToFrontById(WC_TOWN_DIRECTORY, 0)) return;
        new TownDirectoryWindow(&_town_directory_desc);
}

void CcFoundTown(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        if (result.Failed()) return;

        if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_SPLAT_OTHER, tile);
        if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
}

void CcFoundRandomTown(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        if (result.Succeeded()) ScrollMainWindowToTile(Town::Get(_new_town_id)->xy);
}

static const NWidgetPart _nested_found_town_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
                NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_FOUND_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
                NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
        EndContainer(),
        /* Construct new town(s) buttons. */
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
                NWidget(NWID_SPACER), SetMinimalSize(0, 2),
                NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_NEW_TOWN), SetMinimalSize(156, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_NEW_TOWN_BUTTON, STR_FOUND_TOWN_NEW_TOWN_TOOLTIP), SetPadding(0, 2, 1, 2),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_RANDOM_TOWN), SetMinimalSize(156, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_RANDOM_TOWN_BUTTON, STR_FOUND_TOWN_RANDOM_TOWN_TOOLTIP), SetPadding(0, 2, 1, 2),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_MANY_RANDOM_TOWNS), SetMinimalSize(156, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_MANY_RANDOM_TOWNS, STR_FOUND_TOWN_RANDOM_TOWNS_TOOLTIP), SetPadding(0, 2, 0, 2),
                /* Town name selection. */
                NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(156, 14), SetPadding(0, 2, 0, 2), SetDataTip(STR_FOUND_TOWN_NAME_TITLE, STR_NULL),
                NWidget(WWT_EDITBOX, COLOUR_GREY, WID_TF_TOWN_NAME_EDITBOX), SetMinimalSize(156, 12), SetPadding(0, 2, 3, 2),
                                                                                SetDataTip(STR_FOUND_TOWN_NAME_EDITOR_TITLE, STR_FOUND_TOWN_NAME_EDITOR_HELP),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_TOWN_NAME_RANDOM), SetMinimalSize(78, 12), SetPadding(0, 2, 0, 2), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_NAME_RANDOM_BUTTON, STR_FOUND_TOWN_NAME_RANDOM_TOOLTIP),
                /* Town size selection. */
                NWidget(NWID_HORIZONTAL), SetPIP(2, 0, 2),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(148, 14), SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_TITLE, STR_NULL),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                EndContainer(),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(2, 0, 2),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_SMALL), SetMinimalSize(78, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_SMALL_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_MEDIUM), SetMinimalSize(78, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_MEDIUM_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP),
                EndContainer(),
                NWidget(NWID_SPACER), SetMinimalSize(0, 1),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(2, 0, 2),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_LARGE), SetMinimalSize(78, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_LARGE_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_RANDOM), SetMinimalSize(78, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_SIZE_RANDOM, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP),
                EndContainer(),
                NWidget(NWID_SPACER), SetMinimalSize(0, 3),
                NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_CITY), SetPadding(0, 2, 0, 2), SetMinimalSize(156, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_CITY, STR_FOUND_TOWN_CITY_TOOLTIP), SetFill(1, 0),
                /* Town roads selection. */
                NWidget(NWID_HORIZONTAL), SetPIP(2, 0, 2),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                        NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetMinimalSize(148, 14), SetDataTip(STR_FOUND_TOWN_ROAD_LAYOUT, STR_NULL),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                EndContainer(),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(2, 0, 2),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_ORIGINAL), SetMinimalSize(78, 12), SetFill(1, 0), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_ORIGINAL, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_BETTER), SetMinimalSize(78, 12), SetFill(1, 0), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_BETTER_ROADS, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT),
                EndContainer(),
                NWidget(NWID_SPACER), SetMinimalSize(0, 1),
                NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(2, 0, 2),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID2), SetMinimalSize(78, 12), SetFill(1, 0), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_2X2_GRID, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT),
                        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID3), SetMinimalSize(78, 12), SetFill(1, 0), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_3X3_GRID, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT),
                EndContainer(),
                NWidget(NWID_SPACER), SetMinimalSize(0, 1),
                NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_RANDOM), SetPadding(0, 2, 0, 2), SetMinimalSize(0, 12), SetFill(1, 0),
                                                                                SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_RANDOM, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
                NWidget(NWID_SPACER), SetMinimalSize(0, 2),
        EndContainer(),
};

/** Found a town window class. */
struct FoundTownWindow : Window {
private:
        TownSize town_size;     ///< Selected town size
        TownLayout town_layout; ///< Selected town layout
        bool city;              ///< Are we building a city?
        QueryString townname_editbox; ///< Townname editbox
        bool townnamevalid;     ///< Is generated town name valid?
        uint32 townnameparts;   ///< Generated town name
        TownNameParams params;  ///< Town name parameters

public:
        FoundTownWindow(WindowDesc *desc, WindowNumber window_number) :
                        Window(desc),
                        town_size(TSZ_MEDIUM),
                        town_layout(_settings_game.economy.town_layout),
                        townname_editbox(MAX_LENGTH_TOWN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_TOWN_NAME_CHARS),
                        params(_settings_game.game_creation.town_name)
        {
                this->InitNested(window_number);
                this->querystrings[WID_TF_TOWN_NAME_EDITBOX] = &this->townname_editbox;
                this->RandomTownName();
                this->UpdateButtons(true);
        }

        void RandomTownName()
        {
                this->townnamevalid = GenerateTownName(&this->townnameparts);

                if (!this->townnamevalid) {
                        this->townname_editbox.text.DeleteAll();
                } else {
                        GetTownName(this->townname_editbox.text.buf, &this->params, this->townnameparts, &this->townname_editbox.text.buf[this->townname_editbox.text.max_bytes - 1]);
                        this->townname_editbox.text.UpdateSize();
                }
                UpdateOSKOriginalText(this, WID_TF_TOWN_NAME_EDITBOX);

                this->SetWidgetDirty(WID_TF_TOWN_NAME_EDITBOX);
        }

        void UpdateButtons(bool check_availability)
        {
                if (check_availability && _game_mode != GM_EDITOR) {
                        this->SetWidgetsDisabledState(true, WID_TF_RANDOM_TOWN, WID_TF_MANY_RANDOM_TOWNS, WID_TF_SIZE_LARGE, WIDGET_LIST_END);
                        this->SetWidgetsDisabledState(_settings_game.economy.found_town != TF_CUSTOM_LAYOUT,
                                        WID_TF_LAYOUT_ORIGINAL, WID_TF_LAYOUT_BETTER, WID_TF_LAYOUT_GRID2, WID_TF_LAYOUT_GRID3, WID_TF_LAYOUT_RANDOM, WIDGET_LIST_END);
                        if (_settings_game.economy.found_town != TF_CUSTOM_LAYOUT) town_layout = _settings_game.economy.town_layout;
                }

                for (int i = WID_TF_SIZE_SMALL; i <= WID_TF_SIZE_RANDOM; i++) {
                        this->SetWidgetLoweredState(i, i == WID_TF_SIZE_SMALL + this->town_size);
                }

                this->SetWidgetLoweredState(WID_TF_CITY, this->city);

                for (int i = WID_TF_LAYOUT_ORIGINAL; i <= WID_TF_LAYOUT_RANDOM; i++) {
                        this->SetWidgetLoweredState(i, i == WID_TF_LAYOUT_ORIGINAL + this->town_layout);
                }

                this->SetDirty();
        }

        void ExecuteFoundTownCommand(TileIndex tile, bool random, StringID errstr, CommandCallback cc)
        {
                const char *name = nullptr;

                if (!this->townnamevalid) {
                        name = this->townname_editbox.text.buf;
                } else {
                        /* If user changed the name, send it */
                        char buf[MAX_LENGTH_TOWN_NAME_CHARS * MAX_CHAR_LENGTH];
                        GetTownName(buf, &this->params, this->townnameparts, lastof(buf));
                        if (strcmp(buf, this->townname_editbox.text.buf) != 0) name = this->townname_editbox.text.buf;
                }

                bool success = DoCommandP(tile, this->town_size | this->city << 2 | this->town_layout << 3 | random << 6,
                                townnameparts, CMD_FOUND_TOWN | CMD_MSG(errstr), cc, name);

                /* Rerandomise name, if success and no cost-estimation. */
                if (success && !_shift_pressed) this->RandomTownName();
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_TF_NEW_TOWN:
                                HandlePlacePushButton(this, WID_TF_NEW_TOWN, SPR_CURSOR_TOWN, HT_RECT);
                                break;

                        case WID_TF_RANDOM_TOWN:
                                this->ExecuteFoundTownCommand(0, true, STR_ERROR_CAN_T_GENERATE_TOWN, CcFoundRandomTown);
                                break;

                        case WID_TF_TOWN_NAME_RANDOM:
                                this->RandomTownName();
                                this->SetFocusedWidget(WID_TF_TOWN_NAME_EDITBOX);
                                break;

                        case WID_TF_MANY_RANDOM_TOWNS:
                                _generating_world = true;
                                UpdateNearestTownForRoadTiles(true);
                                if (!GenerateTowns(this->town_layout)) {
                                        ShowErrorMessage(STR_ERROR_CAN_T_GENERATE_TOWN, STR_ERROR_NO_SPACE_FOR_TOWN, WL_INFO);
                                }
                                UpdateNearestTownForRoadTiles(false);
                                _generating_world = false;
                                break;

                        case WID_TF_SIZE_SMALL: case WID_TF_SIZE_MEDIUM: case WID_TF_SIZE_LARGE: case WID_TF_SIZE_RANDOM:
                                this->town_size = (TownSize)(widget - WID_TF_SIZE_SMALL);
                                this->UpdateButtons(false);
                                break;

                        case WID_TF_CITY:
                                this->city ^= true;
                                this->SetWidgetLoweredState(WID_TF_CITY, this->city);
                                this->SetDirty();
                                break;

                        case WID_TF_LAYOUT_ORIGINAL: case WID_TF_LAYOUT_BETTER: case WID_TF_LAYOUT_GRID2:
                        case WID_TF_LAYOUT_GRID3: case WID_TF_LAYOUT_RANDOM:
                                this->town_layout = (TownLayout)(widget - WID_TF_LAYOUT_ORIGINAL);
                                this->UpdateButtons(false);
                                break;
                }
        }

        void OnPlaceObject(Point pt, TileIndex tile) override
        {
                this->ExecuteFoundTownCommand(tile, false, STR_ERROR_CAN_T_FOUND_TOWN_HERE, CcFoundTown);
        }

        void OnPlaceObjectAbort() override
        {
                this->RaiseButtons();
                this->UpdateButtons(false);
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (!gui_scope) return;
                this->UpdateButtons(true);
        }
};

static WindowDesc _found_town_desc(
        WDP_AUTO, "build_town", 160, 162,
        WC_FOUND_TOWN, WC_NONE,
        WDF_CONSTRUCTION,
        _nested_found_town_widgets, lengthof(_nested_found_town_widgets)
);

void ShowFoundTownWindow()
{
        if (_game_mode != GM_EDITOR && !Company::IsValidID(_local_company)) return;
        AllocateWindowDescFront<FoundTownWindow>(&_found_town_desc, 0);
}