airport_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "economy_func.h"
#include "window_gui.h"
#include "station_gui.h"
#include "terraform_gui.h"
#include "sound_func.h"
#include "window_func.h"
#include "strings_func.h"
#include "viewport_func.h"
#include "company_func.h"
#include "tilehighlight_func.h"
#include "company_base.h"
#include "station_type.h"
#include "newgrf_airport.h"
#include "newgrf_callbacks.h"
#include "widgets/dropdown_type.h"
#include "core/geometry_func.hpp"
#include "hotkeys.h"
#include "vehicle_func.h"
#include "gui.h"
#include "command_func.h"
#include "airport_cmd.h"
#include "station_cmd.h"
#include "zoom_func.h"
 
#include "widgets/airport_widget.h"
 
#include "safeguards.h"
 
 
static AirportClassID _selected_airport_class; 
static int _selected_airport_index;            
static byte _selected_airport_layout;          
 
static void ShowBuildAirportPicker(Window *parent);
 
SpriteID GetCustomAirportSprite(const AirportSpec *as, byte layout);
 
void CcBuildAirport(Commands cmd, const CommandCost &result, TileIndex tile)
{
  if (result.Failed()) return;
 
  if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
  if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
}
 
static void PlaceAirport(TileIndex tile)
{
  if (_selected_airport_index == -1) return;
 
  byte airport_type = AirportClass::Get(_selected_airport_class)->GetSpec(_selected_airport_index)->GetIndex();
  byte layout = _selected_airport_layout;
  bool adjacent = _ctrl_pressed;
 
  auto proc = [=](bool test, StationID to_join) -> bool {
    if (test) {
      return Command<CMD_BUILD_AIRPORT>::Do(CommandFlagsToDCFlags(GetCommandFlags<CMD_BUILD_AIRPORT>()), tile, airport_type, layout, INVALID_STATION, adjacent).Succeeded();
    } else {
      return Command<CMD_BUILD_AIRPORT>::Post(STR_ERROR_CAN_T_BUILD_AIRPORT_HERE, CcBuildAirport, tile, airport_type, layout, to_join, adjacent);
    }
  };
 
  ShowSelectStationIfNeeded(TileArea(tile, _thd.size.x / TILE_SIZE, _thd.size.y / TILE_SIZE), proc);
}
 
struct BuildAirToolbarWindow : Window {
  int last_user_action; // Last started user action.
 
  BuildAirToolbarWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
  {
    this->InitNested(window_number);
    this->OnInvalidateData();
    if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
    this->last_user_action = WIDGET_LIST_END;
  }
 
  void Close() override
  {
    if (this->IsWidgetLowered(WID_AT_AIRPORT)) SetViewportCatchmentStation(nullptr, true);
    if (_settings_client.gui.link_terraform_toolbar) CloseWindowById(WC_SCEN_LAND_GEN, 0, false);
    this->Window::Close();
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    if (!gui_scope) return;
 
    bool can_build = CanBuildVehicleInfrastructure(VEH_AIRCRAFT);
    this->SetWidgetsDisabledState(!can_build,
      WID_AT_AIRPORT,
      WIDGET_LIST_END);
    if (!can_build) {
      CloseWindowById(WC_BUILD_STATION, TRANSPORT_AIR);
 
      /* Show in the tooltip why this button is disabled. */
      this->GetWidget<NWidgetCore>(WID_AT_AIRPORT)->SetToolTip(STR_TOOLBAR_DISABLED_NO_VEHICLE_AVAILABLE);
    } else {
      this->GetWidget<NWidgetCore>(WID_AT_AIRPORT)->SetToolTip(STR_TOOLBAR_AIRCRAFT_BUILD_AIRPORT_TOOLTIP);
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (widget) {
      case WID_AT_AIRPORT:
        if (HandlePlacePushButton(this, WID_AT_AIRPORT, SPR_CURSOR_AIRPORT, HT_RECT)) {
          ShowBuildAirportPicker(this);
          this->last_user_action = widget;
        }
        break;
 
      case WID_AT_DEMOLISH:
        HandlePlacePushButton(this, WID_AT_DEMOLISH, ANIMCURSOR_DEMOLISH, HT_RECT | HT_DIAGONAL);
        this->last_user_action = widget;
        break;
 
      default: break;
    }
  }
 
 
  void OnPlaceObject(Point pt, TileIndex tile) override
  {
    switch (this->last_user_action) {
      case WID_AT_AIRPORT:
        PlaceAirport(tile);
        break;
 
      case WID_AT_DEMOLISH:
        PlaceProc_DemolishArea(tile);
        break;
 
      default: NOT_REACHED();
    }
  }
 
  void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
  {
    VpSelectTilesWithMethod(pt.x, pt.y, select_method);
  }
 
  void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
  {
    if (pt.x != -1 && select_proc == DDSP_DEMOLISH_AREA) {
      GUIPlaceProcDragXY(select_proc, start_tile, end_tile);
    }
  }
 
  void OnPlaceObjectAbort() override
  {
    if (this->IsWidgetLowered(WID_AT_AIRPORT)) SetViewportCatchmentStation(nullptr, true);
 
    this->RaiseButtons();
 
    CloseWindowById(WC_BUILD_STATION, TRANSPORT_AIR);
    CloseWindowById(WC_SELECT_STATION, 0);
  }
 
  static HotkeyList hotkeys;
};
 
static EventState AirportToolbarGlobalHotkeys(int hotkey)
{
  if (_game_mode != GM_NORMAL) return ES_NOT_HANDLED;
  Window *w = ShowBuildAirToolbar();
  if (w == nullptr) return ES_NOT_HANDLED;
  return w->OnHotkey(hotkey);
}
 
static Hotkey airtoolbar_hotkeys[] = {
  Hotkey('1', "airport", WID_AT_AIRPORT),
  Hotkey('2', "demolish", WID_AT_DEMOLISH),
  HOTKEY_LIST_END
};
HotkeyList BuildAirToolbarWindow::hotkeys("airtoolbar", airtoolbar_hotkeys, AirportToolbarGlobalHotkeys);
 
static const NWidgetPart _nested_air_toolbar_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_TOOLBAR_AIRCRAFT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_AT_AIRPORT), SetFill(0, 1), SetMinimalSize(42, 22), SetDataTip(SPR_IMG_AIRPORT, STR_TOOLBAR_AIRCRAFT_BUILD_AIRPORT_TOOLTIP),
    NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetMinimalSize(4, 22), SetFill(1, 1), EndContainer(),
    NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_AT_DEMOLISH), SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
  EndContainer(),
};
 
static WindowDesc _air_toolbar_desc(
  WDP_ALIGN_TOOLBAR, "toolbar_air", 0, 0,
  WC_BUILD_TOOLBAR, WC_NONE,
  WDF_CONSTRUCTION,
  _nested_air_toolbar_widgets, lengthof(_nested_air_toolbar_widgets),
  &BuildAirToolbarWindow::hotkeys
);
 
Window *ShowBuildAirToolbar()
{
  if (!Company::IsValidID(_local_company)) return nullptr;
 
  CloseWindowByClass(WC_BUILD_TOOLBAR);
  return AllocateWindowDescFront<BuildAirToolbarWindow>(&_air_toolbar_desc, TRANSPORT_AIR);
}
 
class BuildAirportWindow : public PickerWindowBase {
  SpriteID preview_sprite; 
  int line_height;
  Scrollbar *vscroll;
 
  static DropDownList BuildAirportClassDropDown()
  {
    DropDownList list;
 
    for (uint i = 0; i < AirportClass::GetClassCount(); i++) {
      list.emplace_back(new DropDownListStringItem(AirportClass::Get((AirportClassID)i)->name, i, false));
    }
 
    return list;
  }
 
public:
  BuildAirportWindow(WindowDesc *desc, Window *parent) : PickerWindowBase(desc, parent)
  {
    this->CreateNestedTree();
 
    this->vscroll = this->GetScrollbar(WID_AP_SCROLLBAR);
    this->vscroll->SetCapacity(5);
    this->vscroll->SetPosition(0);
 
    this->FinishInitNested(TRANSPORT_AIR);
 
    this->SetWidgetLoweredState(WID_AP_BTN_DONTHILIGHT, !_settings_client.gui.station_show_coverage);
    this->SetWidgetLoweredState(WID_AP_BTN_DOHILIGHT, _settings_client.gui.station_show_coverage);
    this->OnInvalidateData();
 
    /* Ensure airport class is valid (changing NewGRFs). */
    _selected_airport_class = Clamp(_selected_airport_class, APC_BEGIN, (AirportClassID)(AirportClass::GetClassCount() - 1));
    const AirportClass *ac = AirportClass::Get(_selected_airport_class);
    this->vscroll->SetCount(ac->GetSpecCount());
 
    /* Ensure the airport index is valid for this class (changing NewGRFs). */
    _selected_airport_index = Clamp(_selected_airport_index, -1, ac->GetSpecCount() - 1);
 
    /* Only when no valid airport was selected, we want to select the first airport. */
    bool selectFirstAirport = true;
    if (_selected_airport_index != -1) {
      const AirportSpec *as = ac->GetSpec(_selected_airport_index);
      if (as->IsAvailable()) {
        /* Ensure the airport layout is valid. */
        _selected_airport_layout = Clamp(_selected_airport_layout, 0, as->num_table - 1);
        selectFirstAirport = false;
        this->UpdateSelectSize();
      }
    }
 
    if (selectFirstAirport) this->SelectFirstAvailableAirport(true);
  }
 
  void Close() override
  {
    CloseWindowById(WC_SELECT_STATION, 0);
    this->PickerWindowBase::Close();
  }
 
  void SetStringParameters(int widget) const override
  {
    switch (widget) {
      case WID_AP_CLASS_DROPDOWN:
        SetDParam(0, AirportClass::Get(_selected_airport_class)->name);
        break;
 
      case WID_AP_LAYOUT_NUM:
        SetDParam(0, STR_EMPTY);
        if (_selected_airport_index != -1) {
          const AirportSpec *as = AirportClass::Get(_selected_airport_class)->GetSpec(_selected_airport_index);
          StringID string = GetAirportTextCallback(as, _selected_airport_layout, CBID_AIRPORT_LAYOUT_NAME);
          if (string != STR_UNDEFINED) {
            SetDParam(0, string);
          } else if (as->num_table > 1) {
            SetDParam(0, STR_STATION_BUILD_AIRPORT_LAYOUT_NAME);
            SetDParam(1, _selected_airport_layout + 1);
          }
        }
        break;
 
      default: break;
    }
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    switch (widget) {
      case WID_AP_CLASS_DROPDOWN: {
        Dimension d = {0, 0};
        for (uint i = 0; i < AirportClass::GetClassCount(); i++) {
          SetDParam(0, AirportClass::Get((AirportClassID)i)->name);
          d = maxdim(d, GetStringBoundingBox(STR_BLACK_STRING));
        }
        d.width += padding.width;
        d.height += padding.height;
        *size = maxdim(*size, d);
        break;
      }
 
      case WID_AP_AIRPORT_LIST: {
        for (int i = 0; i < NUM_AIRPORTS; i++) {
          const AirportSpec *as = AirportSpec::Get(i);
          if (!as->enabled) continue;
 
          size->width = std::max(size->width, GetStringBoundingBox(as->name).width + padding.width);
        }
 
        this->line_height = FONT_HEIGHT_NORMAL + padding.height;
        size->height = 5 * this->line_height;
        break;
      }
 
      case WID_AP_AIRPORT_SPRITE:
        for (int i = 0; i < NUM_AIRPORTS; i++) {
          const AirportSpec *as = AirportSpec::Get(i);
          if (!as->enabled) continue;
          for (byte layout = 0; layout < as->num_table; layout++) {
            SpriteID sprite = GetCustomAirportSprite(as, layout);
            if (sprite != 0) {
              Dimension d = GetSpriteSize(sprite);
              d.width += WidgetDimensions::scaled.framerect.Horizontal();
              d.height += WidgetDimensions::scaled.framerect.Vertical();
              *size = maxdim(d, *size);
            }
          }
        }
        break;
 
      case WID_AP_EXTRA_TEXT:
        for (int i = NEW_AIRPORT_OFFSET; i < NUM_AIRPORTS; i++) {
          const AirportSpec *as = AirportSpec::Get(i);
          if (!as->enabled) continue;
          for (byte layout = 0; layout < as->num_table; layout++) {
            StringID string = GetAirportTextCallback(as, layout, CBID_AIRPORT_ADDITIONAL_TEXT);
            if (string == STR_UNDEFINED) continue;
 
            /* STR_BLACK_STRING is used to start the string with {BLACK} */
            SetDParam(0, string);
            Dimension d = GetStringMultiLineBoundingBox(STR_BLACK_STRING, *size);
            *size = maxdim(d, *size);
          }
        }
        break;
 
      default: break;
    }
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    switch (widget) {
      case WID_AP_AIRPORT_LIST: {
        Rect row = r.WithHeight(this->line_height).Shrink(WidgetDimensions::scaled.bevel);
        Rect text = r.WithHeight(this->line_height).Shrink(WidgetDimensions::scaled.matrix);
        AirportClass *apclass = AirportClass::Get(_selected_airport_class);
        for (uint i = this->vscroll->GetPosition(); this->vscroll->IsVisible(i) && i < apclass->GetSpecCount(); i++) {
          const AirportSpec *as = apclass->GetSpec(i);
          if (!as->IsAvailable()) {
            GfxFillRect(row, PC_BLACK, FILLRECT_CHECKER);
          }
          DrawString(text, as->name, ((int)i == _selected_airport_index) ? TC_WHITE : TC_BLACK);
          row = row.Translate(0, this->line_height);
          text = text.Translate(0, this->line_height);
        }
        break;
      }
 
      case WID_AP_AIRPORT_SPRITE:
        if (this->preview_sprite != 0) {
          Dimension d = GetSpriteSize(this->preview_sprite);
          DrawSprite(this->preview_sprite, COMPANY_SPRITE_COLOUR(_local_company), CenterBounds(r.left, r.right, d.width), CenterBounds(r.top, r.bottom, d.height));
        }
        break;
 
      case WID_AP_EXTRA_TEXT:
        if (_selected_airport_index != -1) {
          const AirportSpec *as = AirportClass::Get(_selected_airport_class)->GetSpec(_selected_airport_index);
          StringID string = GetAirportTextCallback(as, _selected_airport_layout, CBID_AIRPORT_ADDITIONAL_TEXT);
          if (string != STR_UNDEFINED) {
            SetDParam(0, string);
            DrawStringMultiLine(r.left, r.right, r.top, r.bottom, STR_BLACK_STRING);
          }
        }
        break;
    }
  }
 
  void OnPaint() override
  {
    this->DrawWidgets();
 
    Rect r = this->GetWidget<NWidgetBase>(WID_AP_ACCEPTANCE)->GetCurrentRect();
    int top = r.top + WidgetDimensions::scaled.vsep_normal;
 
    if (_selected_airport_index != -1) {
      const AirportSpec *as = AirportClass::Get(_selected_airport_class)->GetSpec(_selected_airport_index);
      int rad = _settings_game.station.modified_catchment ? as->catchment : (uint)CA_UNMODIFIED;
 
      /* only show the station (airport) noise, if the noise option is activated */
      if (_settings_game.economy.station_noise_level) {
        /* show the noise of the selected airport */
        SetDParam(0, as->noise_level);
        DrawString(r.left, r.right, top, STR_STATION_BUILD_NOISE);
        top += FONT_HEIGHT_NORMAL + WidgetDimensions::scaled.vsep_normal;
      }
 
      if (_settings_game.economy.infrastructure_maintenance) {
        Money monthly = _price[PR_INFRASTRUCTURE_AIRPORT] * as->maintenance_cost >> 3;
        SetDParam(0, monthly * 12);
        DrawString(r.left, r.right, top, STR_STATION_BUILD_INFRASTRUCTURE_COST);
        top += FONT_HEIGHT_NORMAL + WidgetDimensions::scaled.vsep_normal;
      }
 
      /* strings such as 'Size' and 'Coverage Area' */
      top = DrawStationCoverageAreaText(r.left, r.right, top, SCT_ALL, rad, false) + WidgetDimensions::scaled.vsep_normal;
      top = DrawStationCoverageAreaText(r.left, r.right, top, SCT_ALL, rad, true) + WidgetDimensions::scaled.vsep_normal;
    }
 
    /* Resize background if the window is too small.
     * Never make the window smaller to avoid oscillating if the size change affects the acceptance.
     * (This is the case, if making the window bigger moves the mouse into the window.) */
    if (top > r.bottom) {
      ResizeWindow(this, 0, top - r.bottom, false);
    }
  }
 
  void SelectOtherAirport(int airport_index)
  {
    _selected_airport_index = airport_index;
    _selected_airport_layout = 0;
 
    this->UpdateSelectSize();
    this->SetDirty();
  }
 
  void UpdateSelectSize()
  {
    if (_selected_airport_index == -1) {
      SetTileSelectSize(1, 1);
      this->DisableWidget(WID_AP_LAYOUT_DECREASE);
      this->DisableWidget(WID_AP_LAYOUT_INCREASE);
    } else {
      const AirportSpec *as = AirportClass::Get(_selected_airport_class)->GetSpec(_selected_airport_index);
      int w = as->size_x;
      int h = as->size_y;
      Direction rotation = as->rotation[_selected_airport_layout];
      if (rotation == DIR_E || rotation == DIR_W) Swap(w, h);
      SetTileSelectSize(w, h);
 
      this->preview_sprite = GetCustomAirportSprite(as, _selected_airport_layout);
 
      this->SetWidgetDisabledState(WID_AP_LAYOUT_DECREASE, _selected_airport_layout == 0);
      this->SetWidgetDisabledState(WID_AP_LAYOUT_INCREASE, _selected_airport_layout + 1 >= as->num_table);
 
      int rad = _settings_game.station.modified_catchment ? as->catchment : (uint)CA_UNMODIFIED;
      if (_settings_client.gui.station_show_coverage) SetTileSelectBigSize(-rad, -rad, 2 * rad, 2 * rad);
    }
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (widget) {
      case WID_AP_CLASS_DROPDOWN:
        ShowDropDownList(this, BuildAirportClassDropDown(), _selected_airport_class, WID_AP_CLASS_DROPDOWN);
        break;
 
      case WID_AP_AIRPORT_LIST: {
        int num_clicked = this->vscroll->GetPosition() + (pt.y - this->GetWidget<NWidgetBase>(widget)->pos_y) / this->line_height;
        if (num_clicked >= this->vscroll->GetCount()) break;
        const AirportSpec *as = AirportClass::Get(_selected_airport_class)->GetSpec(num_clicked);
        if (as->IsAvailable()) this->SelectOtherAirport(num_clicked);
        break;
      }
 
      case WID_AP_BTN_DONTHILIGHT: case WID_AP_BTN_DOHILIGHT:
        _settings_client.gui.station_show_coverage = (widget != WID_AP_BTN_DONTHILIGHT);
        this->SetWidgetLoweredState(WID_AP_BTN_DONTHILIGHT, !_settings_client.gui.station_show_coverage);
        this->SetWidgetLoweredState(WID_AP_BTN_DOHILIGHT, _settings_client.gui.station_show_coverage);
        this->SetDirty();
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        this->UpdateSelectSize();
        SetViewportCatchmentStation(nullptr, true);
        break;
 
      case WID_AP_LAYOUT_DECREASE:
        _selected_airport_layout--;
        this->UpdateSelectSize();
        this->SetDirty();
        break;
 
      case WID_AP_LAYOUT_INCREASE:
        _selected_airport_layout++;
        this->UpdateSelectSize();
        this->SetDirty();
        break;
    }
  }
 
  void SelectFirstAvailableAirport(bool change_class)
  {
    /* First try to select an airport in the selected class. */
    AirportClass *sel_apclass = AirportClass::Get(_selected_airport_class);
    for (uint i = 0; i < sel_apclass->GetSpecCount(); i++) {
      const AirportSpec *as = sel_apclass->GetSpec(i);
      if (as->IsAvailable()) {
        this->SelectOtherAirport(i);
        return;
      }
    }
    if (change_class) {
      /* If that fails, select the first available airport
       * from a random class. */
      for (AirportClassID j = APC_BEGIN; j < APC_MAX; j++) {
        AirportClass *apclass = AirportClass::Get(j);
        for (uint i = 0; i < apclass->GetSpecCount(); i++) {
          const AirportSpec *as = apclass->GetSpec(i);
          if (as->IsAvailable()) {
            _selected_airport_class = j;
            this->SelectOtherAirport(i);
            return;
          }
        }
      }
    }
    /* If all airports are unavailable, select nothing. */
    this->SelectOtherAirport(-1);
  }
 
  void OnDropdownSelect(int widget, int index) override
  {
    assert(widget == WID_AP_CLASS_DROPDOWN);
    _selected_airport_class = (AirportClassID)index;
    this->vscroll->SetCount(AirportClass::Get(_selected_airport_class)->GetSpecCount());
    this->SelectFirstAvailableAirport(false);
  }
 
  void OnRealtimeTick(uint delta_ms) override
  {
    CheckRedrawStationCoverage(this);
  }
};
 
static const NWidgetPart _nested_build_airport_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_STATION_BUILD_AIRPORT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetFill(1, 0), SetPIP(2, 0, 2),
    NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetDataTip(STR_STATION_BUILD_AIRPORT_CLASS_LABEL, STR_NULL), SetFill(1, 0),
    NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_AP_CLASS_DROPDOWN), SetFill(1, 0), SetDataTip(STR_BLACK_STRING, STR_STATION_BUILD_AIRPORT_TOOLTIP),
    NWidget(WWT_EMPTY, COLOUR_DARK_GREEN, WID_AP_AIRPORT_SPRITE), SetFill(1, 0),
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_MATRIX, COLOUR_GREY, WID_AP_AIRPORT_LIST), SetFill(1, 0), SetMatrixDataTip(1, 5, STR_STATION_BUILD_AIRPORT_TOOLTIP), SetScrollbar(WID_AP_SCROLLBAR),
      NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_AP_SCROLLBAR),
    EndContainer(),
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_AP_LAYOUT_DECREASE), SetMinimalSize(12, 0), SetDataTip(AWV_DECREASE, STR_NULL),
      NWidget(WWT_LABEL, COLOUR_GREY, WID_AP_LAYOUT_NUM), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_BLACK_STRING, STR_NULL),
      NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_AP_LAYOUT_INCREASE), SetMinimalSize(12, 0), SetDataTip(AWV_INCREASE, STR_NULL),
    EndContainer(),
    NWidget(WWT_EMPTY, COLOUR_DARK_GREEN, WID_AP_EXTRA_TEXT), SetFill(1, 0), SetMinimalSize(150, 0),
  EndContainer(),
  /* Bottom panel. */
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_AP_BOTTOMPANEL),
    NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetPadding(WidgetDimensions::unscaled.framerect), SetDataTip(STR_STATION_BUILD_COVERAGE_AREA_TITLE, STR_NULL), SetFill(1, 0),
    NWidget(NWID_HORIZONTAL),
      NWidget(NWID_SPACER), SetMinimalSize(14, 0), SetFill(1, 0),
      NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_AP_BTN_DONTHILIGHT), SetMinimalSize(60, 12), SetFill(1, 0),
                      SetDataTip(STR_STATION_BUILD_COVERAGE_OFF, STR_STATION_BUILD_COVERAGE_AREA_OFF_TOOLTIP),
        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_AP_BTN_DOHILIGHT), SetMinimalSize(60, 12), SetFill(1, 0),
                      SetDataTip(STR_STATION_BUILD_COVERAGE_ON, STR_STATION_BUILD_COVERAGE_AREA_ON_TOOLTIP),
      EndContainer(),
      NWidget(NWID_SPACER), SetMinimalSize(14, 0), SetFill(1, 0),
    EndContainer(),
    NWidget(WWT_EMPTY, COLOUR_DARK_GREEN, WID_AP_ACCEPTANCE), SetPadding(WidgetDimensions::unscaled.framerect), SetResize(0, 1), SetFill(1, 0),
  EndContainer(),
};
 
static WindowDesc _build_airport_desc(
  WDP_AUTO, "build_station_air", 0, 0,
  WC_BUILD_STATION, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_build_airport_widgets, lengthof(_nested_build_airport_widgets)
);
 
static void ShowBuildAirportPicker(Window *parent)
{
  new BuildAirportWindow(&_build_airport_desc, parent);
}
 
void InitializeAirportGui()
{
  _selected_airport_class = APC_BEGIN;
  _selected_airport_index = -1;
}