depot_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 "train.h"
#include "roadveh.h"
#include "ship.h"
#include "aircraft.h"
#include "gui.h"
#include "textbuf_gui.h"
#include "viewport_func.h"
#include "command_func.h"
#include "depot_base.h"
#include "spritecache.h"
#include "strings_func.h"
#include "vehicle_func.h"
#include "company_func.h"
#include "tilehighlight_func.h"
#include "window_gui.h"
#include "vehiclelist.h"
#include "vehicle_func.h"
#include "order_backup.h"
#include "zoom_func.h"
#include "error.h"
#include "depot_cmd.h"
#include "train_cmd.h"
#include "vehicle_cmd.h"
#include "core/geometry_func.hpp"
 
#include "widgets/depot_widget.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
/*
 * Since all depot window sizes aren't the same, we need to modify sizes a little.
 * It's done with the following arrays of widget indexes. Each of them tells if a widget side should be moved and in what direction.
 * How long they should be moved and for what window types are controlled in ShowDepotWindow()
 */
 
static constexpr NWidgetPart _nested_train_depot_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_D_SHOW_RENAME), SetAspect(WidgetDimensions::ASPECT_RENAME), // rename button
      NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_RENAME), SetAspect(WidgetDimensions::ASPECT_RENAME), SetDataTip(SPR_RENAME, STR_DEPOT_RENAME_TOOLTIP),
    EndContainer(),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_D_CAPTION), SetDataTip(STR_DEPOT_CAPTION, STR_NULL),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_LOCATION), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetDataTip(SPR_GOTO_LOCATION, STR_NULL),
    NWidget(WWT_SHADEBOX, COLOUR_GREY),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
    NWidget(WWT_STICKYBOX, COLOUR_GREY),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_VERTICAL),
      NWidget(WWT_MATRIX, COLOUR_GREY, WID_D_MATRIX), SetResize(1, 1), SetScrollbar(WID_D_V_SCROLL),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_D_SHOW_H_SCROLL),
        NWidget(NWID_HSCROLLBAR, COLOUR_GREY, WID_D_H_SCROLL),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(WWT_IMGBTN, COLOUR_GREY, WID_D_SELL), SetDataTip(0x0, STR_NULL), SetResize(0, 1), SetFill(0, 1),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_D_SHOW_SELL_CHAIN),
        NWidget(WWT_IMGBTN, COLOUR_GREY, WID_D_SELL_CHAIN), SetDataTip(SPR_SELL_CHAIN_TRAIN, STR_DEPOT_DRAG_WHOLE_TRAIN_TO_SELL_TOOLTIP), SetResize(0, 1), SetFill(0, 1),
      EndContainer(),
      NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_SELL_ALL), SetDataTip(0x0, STR_NULL),
      NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_AUTOREPLACE), SetDataTip(0x0, STR_NULL),
    EndContainer(),
    NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_D_V_SCROLL),
  EndContainer(),
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_D_BUILD), SetDataTip(0x0, STR_NULL), SetFill(1, 1), SetResize(1, 0),
    NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_D_CLONE), SetDataTip(0x0, STR_NULL), SetFill(1, 1), SetResize(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_D_VEHICLE_LIST), SetDataTip(0x0, STR_NULL), SetAspect(WidgetDimensions::ASPECT_VEHICLE_ICON), SetFill(0, 1),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_STOP_ALL), SetDataTip(SPR_FLAG_VEH_STOPPED, STR_NULL), SetAspect(WidgetDimensions::ASPECT_VEHICLE_FLAG), SetFill(0, 1),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_D_START_ALL), SetDataTip(SPR_FLAG_VEH_RUNNING, STR_NULL), SetAspect(WidgetDimensions::ASPECT_VEHICLE_FLAG), SetFill(0, 1),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
static WindowDesc _train_depot_desc(
  WDP_AUTO, "depot_train", 362, 123,
  WC_VEHICLE_DEPOT, WC_NONE,
  0,
  _nested_train_depot_widgets
);
 
static WindowDesc _road_depot_desc(
  WDP_AUTO, "depot_roadveh", 316, 97,
  WC_VEHICLE_DEPOT, WC_NONE,
  0,
  _nested_train_depot_widgets
);
 
static WindowDesc _ship_depot_desc(
  WDP_AUTO, "depot_ship", 306, 99,
  WC_VEHICLE_DEPOT, WC_NONE,
  0,
  _nested_train_depot_widgets
);
 
static WindowDesc _aircraft_depot_desc(
  WDP_AUTO, "depot_aircraft", 332, 99,
  WC_VEHICLE_DEPOT, WC_NONE,
  0,
  _nested_train_depot_widgets
);
 
extern void DepotSortList(VehicleList *list);
 
void CcCloneVehicle(Commands, const CommandCost &result, VehicleID veh_id)
{
  if (result.Failed()) return;
 
  const Vehicle *v = Vehicle::Get(veh_id);
 
  ShowVehicleViewWindow(v);
}
 
static void TrainDepotMoveVehicle(const Vehicle *wagon, VehicleID sel, const Vehicle *head)
{
  const Vehicle *v = Vehicle::Get(sel);
 
  if (v == wagon) return;
 
  if (wagon == nullptr) {
    if (head != nullptr) wagon = head->Last();
  } else {
    wagon = wagon->Previous();
    if (wagon == nullptr) return;
  }
 
  if (wagon == v) return;
 
  Command<CMD_MOVE_RAIL_VEHICLE>::Post(STR_ERROR_CAN_T_MOVE_VEHICLE, v->tile, v->index, wagon == nullptr ? INVALID_VEHICLE : wagon->index, _ctrl_pressed);
}
 
static VehicleCellSize _base_block_sizes_depot[VEH_COMPANY_END];    
static VehicleCellSize _base_block_sizes_purchase[VEH_COMPANY_END]; 
static uint _consistent_train_width;                                
 
VehicleCellSize GetVehicleImageCellSize(VehicleType type, EngineImageType image_type)
{
  switch (image_type) {
    case EIT_IN_DEPOT: return _base_block_sizes_depot[type];
    case EIT_PURCHASE: return _base_block_sizes_purchase[type];
    default: NOT_REACHED();
  }
}
 
static void InitBlocksizeForVehicles(VehicleType type, EngineImageType image_type)
{
  int max_extend_left  = 0;
  int max_extend_right = 0;
  uint max_height = 0;
 
  for (const Engine *e : Engine::IterateType(type)) {
    if (!e->IsEnabled()) continue;
 
    EngineID eid = e->index;
    uint x, y;
    int x_offs, y_offs;
 
    switch (type) {
      default: NOT_REACHED();
      case VEH_TRAIN:    GetTrainSpriteSize(   eid, x, y, x_offs, y_offs, image_type); break;
      case VEH_ROAD:     GetRoadVehSpriteSize( eid, x, y, x_offs, y_offs, image_type); break;
      case VEH_SHIP:     GetShipSpriteSize(    eid, x, y, x_offs, y_offs, image_type); break;
      case VEH_AIRCRAFT: GetAircraftSpriteSize(eid, x, y, x_offs, y_offs, image_type); break;
    }
    if (y > max_height) max_height = y;
    if (-x_offs > max_extend_left) max_extend_left = -x_offs;
    if ((int)x + x_offs > max_extend_right) max_extend_right = x + x_offs;
  }
 
  int min_extend = ScaleSpriteTrad(16);
  int max_extend = ScaleSpriteTrad(98);
 
  switch (image_type) {
    case EIT_IN_DEPOT:
      _base_block_sizes_depot[type].height       = std::max<uint>(ScaleSpriteTrad(GetVehicleHeight(type)), max_height);
      _base_block_sizes_depot[type].extend_left  = Clamp(max_extend_left, min_extend, max_extend);
      _base_block_sizes_depot[type].extend_right = Clamp(max_extend_right, min_extend, max_extend);
      break;
    case EIT_PURCHASE:
      _base_block_sizes_purchase[type].height       = std::max<uint>(ScaleSpriteTrad(GetVehicleHeight(type)), max_height);
      _base_block_sizes_purchase[type].extend_left  = Clamp(max_extend_left, min_extend, max_extend);
      _base_block_sizes_purchase[type].extend_right = Clamp(max_extend_right, min_extend, max_extend);
      break;
 
    default: NOT_REACHED();
  }
}
 
void InitDepotWindowBlockSizes()
{
  for (VehicleType vt = VEH_BEGIN; vt < VEH_COMPANY_END; vt++) {
    InitBlocksizeForVehicles(vt, EIT_IN_DEPOT);
    InitBlocksizeForVehicles(vt, EIT_PURCHASE);
  }
 
  _consistent_train_width = TRAININFO_DEFAULT_VEHICLE_WIDTH;
  bool first = true;
  for (const Engine *e : Engine::IterateType(VEH_TRAIN)) {
    if (!e->IsEnabled()) continue;
 
    uint w = TRAININFO_DEFAULT_VEHICLE_WIDTH;
    if (e->GetGRF() != nullptr && is_custom_sprite(e->u.rail.image_index)) {
      w = e->GetGRF()->traininfo_vehicle_width;
      if (w != VEHICLEINFO_FULL_VEHICLE_WIDTH) {
        /* Hopeless.
         * This is a NewGRF vehicle that uses TRAININFO_DEFAULT_VEHICLE_WIDTH.
         * If the vehicles are shorter than 8/8 we have fractional lengths, which are not consistent after rounding.
         */
        _consistent_train_width = 0;
        break;
      }
    }
 
    if (first) {
      _consistent_train_width = w;
      first = false;
    } else if (w != _consistent_train_width) {
      _consistent_train_width = 0;
      break;
    }
  }
}
 
static void DepotSellAllConfirmationCallback(Window *w, bool confirmed);
const Sprite *GetAircraftSprite(EngineID engine);
 
struct DepotWindow : Window {
  VehicleID sel;
  VehicleID vehicle_over; 
  VehicleType type;
  bool generate_list;
  WidgetID hovered_widget; 
  VehicleList vehicle_list;
  VehicleList wagon_list;
  uint unitnumber_digits;
  uint num_columns;       
  Scrollbar *hscroll;     
  Scrollbar *vscroll;
 
  DepotWindow(WindowDesc &desc, TileIndex tile, VehicleType type) : Window(desc)
  {
    assert(IsCompanyBuildableVehicleType(type)); // ensure that we make the call with a valid type
 
    this->sel = INVALID_VEHICLE;
    this->vehicle_over = INVALID_VEHICLE;
    this->generate_list = true;
    this->hovered_widget = -1;
    this->type = type;
    this->num_columns = 1; // for non-trains this gets set in FinishInitNested()
    this->unitnumber_digits = 2;
 
    this->CreateNestedTree();
    this->hscroll = (this->type == VEH_TRAIN ? this->GetScrollbar(WID_D_H_SCROLL) : nullptr);
    this->vscroll = this->GetScrollbar(WID_D_V_SCROLL);
    /* Don't show 'rename button' of aircraft hangar */
    this->GetWidget<NWidgetStacked>(WID_D_SHOW_RENAME)->SetDisplayedPlane(type == VEH_AIRCRAFT ? SZSP_NONE : 0);
    /* Only train depots have a horizontal scrollbar and a 'sell chain' button */
    if (type == VEH_TRAIN) this->GetWidget<NWidgetCore>(WID_D_MATRIX)->widget_data = 1 << MAT_COL_START;
    this->GetWidget<NWidgetStacked>(WID_D_SHOW_H_SCROLL)->SetDisplayedPlane(type == VEH_TRAIN ? 0 : SZSP_HORIZONTAL);
    this->GetWidget<NWidgetStacked>(WID_D_SHOW_SELL_CHAIN)->SetDisplayedPlane(type == VEH_TRAIN ? 0 : SZSP_NONE);
    this->SetupWidgetData(type);
    this->FinishInitNested(tile);
 
    this->owner = GetTileOwner(tile);
    OrderBackup::Reset();
  }
 
  void Close([[maybe_unused]] int data = 0) override
  {
    CloseWindowById(WC_BUILD_VEHICLE, this->window_number);
    CloseWindowById(GetWindowClassForVehicleType(this->type), VehicleListIdentifier(VL_DEPOT_LIST, this->type, this->owner, this->GetDepotIndex()).Pack(), false);
    OrderBackup::Reset(this->window_number);
    this->Window::Close();
  }
 
  void DrawVehicleInDepot(const Vehicle *v, const Rect &r) const
  {
    bool free_wagon = false;
 
    bool rtl = _current_text_dir == TD_RTL;
    Rect text = r.Shrink(RectPadding::zero, WidgetDimensions::scaled.matrix);       /* Ract for text elements, horizontal is already applied. */
    Rect image = r.Indent(this->header_width, rtl).Indent(this->count_width, !rtl); /* Rect for vehicle images */
 
    switch (v->type) {
      case VEH_TRAIN: {
        const Train *u = Train::From(v);
        free_wagon = u->IsFreeWagon();
 
        uint x_space = free_wagon ?
            ScaleSpriteTrad(_consistent_train_width != 0 ? _consistent_train_width : TRAININFO_DEFAULT_VEHICLE_WIDTH) :
            0;
 
        DrawTrainImage(u, image.Indent(x_space, rtl), this->sel, EIT_IN_DEPOT, free_wagon ? 0 : this->hscroll->GetPosition(), this->vehicle_over);
 
        /* Length of consist in tiles with 1 fractional digit (rounded up) */
        SetDParam(0, CeilDiv(u->gcache.cached_total_length * 10, TILE_SIZE));
        SetDParam(1, 1);
        Rect count = text.WithWidth(this->count_width - WidgetDimensions::scaled.hsep_normal, !rtl);
        DrawString(count.left, count.right, count.bottom - GetCharacterHeight(FS_SMALL) + 1, STR_JUST_DECIMAL, TC_BLACK, SA_RIGHT, false, FS_SMALL); // Draw the counter
        break;
      }
 
      case VEH_ROAD:     DrawRoadVehImage( v, image, this->sel, EIT_IN_DEPOT); break;
      case VEH_SHIP:     DrawShipImage(    v, image, this->sel, EIT_IN_DEPOT); break;
      case VEH_AIRCRAFT: DrawAircraftImage(v, image, this->sel, EIT_IN_DEPOT); break;
      default: NOT_REACHED();
    }
 
    uint diff_x, diff_y;
    if (v->IsGroundVehicle()) {
      /* Arrange unitnumber and flag horizontally */
      diff_x = this->flag_size.width + WidgetDimensions::scaled.hsep_normal;
      diff_y = WidgetDimensions::scaled.matrix.top;
    } else {
      /* Arrange unitnumber and flag vertically */
      diff_x = 0;
      diff_y = WidgetDimensions::scaled.matrix.top + GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal;
    }
 
    text = text.WithWidth(this->header_width - WidgetDimensions::scaled.hsep_normal, rtl).WithHeight(GetCharacterHeight(FS_NORMAL)).Indent(diff_x, rtl);
    if (free_wagon) {
      DrawString(text, STR_DEPOT_NO_ENGINE);
    } else {
      Rect flag = r.WithWidth(this->flag_size.width, rtl).WithHeight(this->flag_size.height).Translate(0, diff_y);
      DrawSpriteIgnorePadding((v->vehstatus & VS_STOPPED) ? SPR_FLAG_VEH_STOPPED : SPR_FLAG_VEH_RUNNING, PAL_NONE, flag, SA_CENTER);
 
      SetDParam(0, v->unitnumber);
      DrawString(text, STR_JUST_COMMA, (v->max_age - CalendarTime::DAYS_IN_LEAP_YEAR) >= v->age ? TC_BLACK : TC_RED);
    }
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    if (widget != WID_D_MATRIX) return;
 
    bool rtl = _current_text_dir == TD_RTL;
 
    /* Set the row and number of boxes in each row based on the number of boxes drawn in the matrix */
    const NWidgetCore *wid = this->GetWidget<NWidgetCore>(WID_D_MATRIX);
 
    /* Set up rect for each cell */
    Rect ir = r.WithHeight(this->resize.step_height);
    if (this->num_columns != 1) ir = ir.WithWidth(this->resize.step_width, rtl);
    ir = ir.Shrink(WidgetDimensions::scaled.framerect, RectPadding::zero);
 
    /* Draw vertical separators at whole tiles.
     * This only works in two cases:
     *  - All vehicles use VEHICLEINFO_FULL_VEHICLE_WIDTH as reference width.
     *  - All vehicles are 8/8. This cannot be checked for NewGRF, so instead we check for "all vehicles are original vehicles".
     */
    if (this->type == VEH_TRAIN && _consistent_train_width != 0) {
      int w = ScaleSpriteTrad(2 * _consistent_train_width);
      int col = GetColourGradient(wid->colour, SHADE_NORMAL);
      Rect image = ir.Indent(this->header_width, rtl).Indent(this->count_width, !rtl);
      int first_line = w + (-this->hscroll->GetPosition()) % w;
      if (rtl) {
        for (int x = image.right - first_line; x >= image.left; x -= w) {
          GfxDrawLine(x, r.top, x, r.bottom, col, ScaleGUITrad(1), ScaleGUITrad(3));
        }
      } else {
        for (int x = image.left + first_line; x <= image.right; x += w) {
          GfxDrawLine(x, r.top, x, r.bottom, col, ScaleGUITrad(1), ScaleGUITrad(3));
        }
      }
    }
 
    uint16_t rows_in_display = wid->current_y / wid->resize_y;
 
    uint num = this->vscroll->GetPosition() * this->num_columns;
    uint maxval = static_cast<uint>(std::min<size_t>(this->vehicle_list.size(), num + (rows_in_display * this->num_columns)));
    for (; num < maxval; ir = ir.Translate(0, this->resize.step_height)) { // Draw the rows
      Rect cell = ir; /* Keep track of horizontal cells */
      for (uint i = 0; i < this->num_columns && num < maxval; i++, num++) {
        /* Draw all vehicles in the current row */
        const Vehicle *v = this->vehicle_list[num];
        this->DrawVehicleInDepot(v, cell);
        cell = cell.Translate(rtl ? -(int)this->resize.step_width : (int)this->resize.step_width, 0);
      }
    }
 
    maxval = static_cast<uint>(std::min<size_t>(this->vehicle_list.size() + this->wagon_list.size(), (this->vscroll->GetPosition() * this->num_columns) + (rows_in_display * this->num_columns)));
 
    /* Draw the train wagons without an engine in front. */
    for (; num < maxval; num++, ir = ir.Translate(0, this->resize.step_height)) {
      const Vehicle *v = this->wagon_list[num - this->vehicle_list.size()];
      this->DrawVehicleInDepot(v, ir);
    }
  }
 
  void SetStringParameters(WidgetID widget) const override
  {
    if (widget != WID_D_CAPTION) return;
 
    SetDParam(0, this->type);
    SetDParam(1, this->GetDepotIndex());
  }
 
  struct GetDepotVehiclePtData {
    const Vehicle *head;
    const Vehicle *wagon;
  };
 
  enum DepotGUIAction {
    MODE_ERROR,
    MODE_DRAG_VEHICLE,
    MODE_SHOW_VEHICLE,
    MODE_START_STOP,
  };
 
  DepotGUIAction GetVehicleFromDepotWndPt(int x, int y, const Vehicle **veh, GetDepotVehiclePtData *d) const
  {
    const NWidgetCore *matrix_widget = this->GetWidget<NWidgetCore>(WID_D_MATRIX);
    /* Make X relative to widget. Y is left alone for GetScrolledRowFromWidget(). */
    x -= matrix_widget->pos_x;
    /* In case of RTL the widgets are swapped as a whole */
    if (_current_text_dir == TD_RTL) x = matrix_widget->current_x - x;
 
    uint xt = 0, xm = 0, ym = 0;
    if (this->type == VEH_TRAIN) {
      xm = x;
    } else {
      xt = x / this->resize.step_width;
      xm = x % this->resize.step_width;
      if (xt >= this->num_columns) return MODE_ERROR;
    }
    ym = (y - matrix_widget->pos_y) % this->resize.step_height;
 
    int32_t row = this->vscroll->GetScrolledRowFromWidget(y, this, WID_D_MATRIX);
    uint pos = (row * this->num_columns) + xt;
 
    if (row == INT32_MAX || this->vehicle_list.size() + this->wagon_list.size() <= pos) {
      /* Clicking on 'line' / 'block' without a vehicle */
      if (this->type == VEH_TRAIN) {
        /* End the dragging */
        d->head  = nullptr;
        d->wagon = nullptr;
        return MODE_DRAG_VEHICLE;
      } else {
        return MODE_ERROR; // empty block, so no vehicle is selected
      }
    }
 
    bool wagon = false;
    if (this->vehicle_list.size() > pos) {
      *veh = this->vehicle_list[pos];
      /* Skip vehicles that are scrolled off the list */
      if (this->type == VEH_TRAIN) x += this->hscroll->GetPosition();
    } else {
      pos -= (uint)this->vehicle_list.size();
      *veh = this->wagon_list[pos];
      /* free wagons don't have an initial loco. */
      x -= ScaleSpriteTrad(VEHICLEINFO_FULL_VEHICLE_WIDTH);
      wagon = true;
    }
 
    const Train *v = nullptr;
    if (this->type == VEH_TRAIN) {
      v = Train::From(*veh);
      d->head = d->wagon = v;
    }
 
    if (xm <= this->header_width) {
      switch (this->type) {
        case VEH_TRAIN:
          if (wagon) return MODE_ERROR;
          [[fallthrough]];
 
        case VEH_ROAD:
          if (xm <= this->flag_size.width) return MODE_START_STOP;
          break;
 
        case VEH_SHIP:
        case VEH_AIRCRAFT:
          if (xm <= this->flag_size.width && ym >= (uint)(GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal)) return MODE_START_STOP;
          break;
 
        default: NOT_REACHED();
      }
      return MODE_SHOW_VEHICLE;
    }
 
    if (this->type != VEH_TRAIN) return MODE_DRAG_VEHICLE;
 
    /* Clicking on the counter */
    if (xm >= matrix_widget->current_x - this->count_width) return wagon ? MODE_ERROR : MODE_SHOW_VEHICLE;
 
    /* Account for the header */
    x -= this->header_width;
 
    /* find the vehicle in this row that was clicked */
    for (; v != nullptr; v = v->Next()) {
      x -= v->GetDisplayImageWidth();
      if (x < 0) break;
    }
 
    d->wagon = (v != nullptr ? v->GetFirstEnginePart() : nullptr);
 
    return MODE_DRAG_VEHICLE;
  }
 
  void DepotClick(int x, int y)
  {
    GetDepotVehiclePtData gdvp = { nullptr, nullptr };
    const Vehicle *v = nullptr;
    DepotGUIAction mode = this->GetVehicleFromDepotWndPt(x, y, &v, &gdvp);
 
    if (this->type == VEH_TRAIN) v = gdvp.wagon;
 
    switch (mode) {
      case MODE_ERROR: // invalid
        return;
 
      case MODE_DRAG_VEHICLE: { // start dragging of vehicle
        if (v != nullptr && VehicleClicked(v)) return;
 
        VehicleID sel = this->sel;
 
        if (this->type == VEH_TRAIN && sel != INVALID_VEHICLE) {
          this->sel = INVALID_VEHICLE;
          TrainDepotMoveVehicle(v, sel, gdvp.head);
        } else if (v != nullptr) {
          SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
          SetMouseCursorVehicle(v, EIT_IN_DEPOT);
          _cursor.vehchain = _ctrl_pressed;
 
          this->sel = v->index;
          this->SetDirty();
        }
        break;
      }
 
      case MODE_SHOW_VEHICLE: // show info window
        ShowVehicleViewWindow(v);
        break;
 
      case MODE_START_STOP: // click start/stop flag
        StartStopVehicle(v, false);
        break;
 
      default: NOT_REACHED();
    }
  }
 
  void SetupWidgetData(VehicleType type)
  {
    this->GetWidget<NWidgetCore>(WID_D_STOP_ALL)->tool_tip     = STR_DEPOT_MASS_STOP_DEPOT_TRAIN_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_START_ALL)->tool_tip    = STR_DEPOT_MASS_START_DEPOT_TRAIN_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_SELL)->tool_tip         = STR_DEPOT_TRAIN_SELL_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_SELL_ALL)->tool_tip     = STR_DEPOT_SELL_ALL_BUTTON_TRAIN_TOOLTIP + type;
 
    this->GetWidget<NWidgetCore>(WID_D_BUILD)->SetDataTip(STR_DEPOT_TRAIN_NEW_VEHICLES_BUTTON + type, STR_DEPOT_TRAIN_NEW_VEHICLES_TOOLTIP + type);
    this->GetWidget<NWidgetCore>(WID_D_CLONE)->SetDataTip(STR_DEPOT_CLONE_TRAIN + type, STR_DEPOT_CLONE_TRAIN_DEPOT_INFO + type);
 
    this->GetWidget<NWidgetCore>(WID_D_LOCATION)->tool_tip     = STR_DEPOT_TRAIN_LOCATION_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_VEHICLE_LIST)->tool_tip = STR_DEPOT_VEHICLE_ORDER_LIST_TRAIN_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_AUTOREPLACE)->tool_tip  = STR_DEPOT_AUTOREPLACE_TRAIN_TOOLTIP + type;
    this->GetWidget<NWidgetCore>(WID_D_MATRIX)->tool_tip       = STR_DEPOT_TRAIN_LIST_TOOLTIP + this->type;
 
    switch (type) {
      default: NOT_REACHED();
 
      case VEH_TRAIN:
        this->GetWidget<NWidgetCore>(WID_D_VEHICLE_LIST)->widget_data = STR_TRAIN;
 
        /* Sprites */
        this->GetWidget<NWidgetCore>(WID_D_SELL)->widget_data        = SPR_SELL_TRAIN;
        this->GetWidget<NWidgetCore>(WID_D_SELL_ALL)->widget_data    = SPR_SELL_ALL_TRAIN;
        this->GetWidget<NWidgetCore>(WID_D_AUTOREPLACE)->widget_data = SPR_REPLACE_TRAIN;
        break;
 
      case VEH_ROAD:
        this->GetWidget<NWidgetCore>(WID_D_VEHICLE_LIST)->widget_data = STR_LORRY;
 
        /* Sprites */
        this->GetWidget<NWidgetCore>(WID_D_SELL)->widget_data        = SPR_SELL_ROADVEH;
        this->GetWidget<NWidgetCore>(WID_D_SELL_ALL)->widget_data    = SPR_SELL_ALL_ROADVEH;
        this->GetWidget<NWidgetCore>(WID_D_AUTOREPLACE)->widget_data = SPR_REPLACE_ROADVEH;
        break;
 
      case VEH_SHIP:
        this->GetWidget<NWidgetCore>(WID_D_VEHICLE_LIST)->widget_data = STR_SHIP;
 
        /* Sprites */
        this->GetWidget<NWidgetCore>(WID_D_SELL)->widget_data        = SPR_SELL_SHIP;
        this->GetWidget<NWidgetCore>(WID_D_SELL_ALL)->widget_data    = SPR_SELL_ALL_SHIP;
        this->GetWidget<NWidgetCore>(WID_D_AUTOREPLACE)->widget_data = SPR_REPLACE_SHIP;
        break;
 
      case VEH_AIRCRAFT:
        this->GetWidget<NWidgetCore>(WID_D_VEHICLE_LIST)->widget_data = STR_PLANE;
 
        /* Sprites */
        this->GetWidget<NWidgetCore>(WID_D_SELL)->widget_data        = SPR_SELL_AIRCRAFT;
        this->GetWidget<NWidgetCore>(WID_D_SELL_ALL)->widget_data    = SPR_SELL_ALL_AIRCRAFT;
        this->GetWidget<NWidgetCore>(WID_D_AUTOREPLACE)->widget_data = SPR_REPLACE_AIRCRAFT;
        break;
    }
  }
 
  uint count_width;          
  uint header_width;         
  Dimension flag_size;       
  VehicleCellSize cell_size; 
 
  void OnInit() override
  {
    this->cell_size = GetVehicleImageCellSize(this->type, EIT_IN_DEPOT);
    this->flag_size = maxdim(GetScaledSpriteSize(SPR_FLAG_VEH_STOPPED), GetScaledSpriteSize(SPR_FLAG_VEH_RUNNING));
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_D_MATRIX: {
        uint min_height = 0;
 
        if (this->type == VEH_TRAIN) {
          SetDParamMaxValue(0, 1000, 0, FS_SMALL);
          SetDParam(1, 1);
          this->count_width = GetStringBoundingBox(STR_JUST_DECIMAL, FS_SMALL).width + WidgetDimensions::scaled.hsep_normal;
        } else {
          this->count_width = 0;
        }
 
        SetDParamMaxDigits(0, this->unitnumber_digits);
        Dimension unumber = GetStringBoundingBox(STR_JUST_COMMA);
 
        if (this->type == VEH_TRAIN || this->type == VEH_ROAD) {
          min_height = std::max<uint>(unumber.height, this->flag_size.height);
          this->header_width = unumber.width + WidgetDimensions::scaled.hsep_normal + this->flag_size.width + WidgetDimensions::scaled.hsep_normal;
        } else {
          min_height = unumber.height + WidgetDimensions::scaled.vsep_normal + this->flag_size.height;
          this->header_width = std::max<uint>(unumber.width, this->flag_size.width) + WidgetDimensions::scaled.hsep_normal;
        }
        int base_width = this->count_width + this->header_width + padding.width;
 
        resize.height = std::max<uint>(this->cell_size.height, min_height + padding.height);
        if (this->type == VEH_TRAIN) {
          resize.width = 1;
          size.width = base_width + 2 * ScaleSpriteTrad(29); // about 2 parts
          size.height = resize.height * 6;
        } else {
          resize.width = base_width + this->cell_size.extend_left + this->cell_size.extend_right;
          size.width = resize.width * (this->type == VEH_ROAD ? 5 : 3);
          size.height = resize.height * (this->type == VEH_ROAD ? 5 : 3);
        }
        fill.width = resize.width;
        fill.height = resize.height;
        break;
      }
    }
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    this->generate_list = true;
  }
 
  void OnPaint() override
  {
    if (this->generate_list) {
      /* Generate the vehicle list
       * It's ok to use the wagon pointers for non-trains as they will be ignored */
      BuildDepotVehicleList(this->type, this->window_number, &this->vehicle_list, &this->wagon_list);
      this->generate_list = false;
      DepotSortList(&this->vehicle_list);
 
      uint new_unitnumber_digits = GetUnitNumberDigits(this->vehicle_list);
      /* Only increase the size; do not decrease to prevent constant changes */
      if (this->unitnumber_digits < new_unitnumber_digits) {
        this->unitnumber_digits = new_unitnumber_digits;
        this->ReInit();
      }
    }
 
    /* determine amount of items for scroller */
    if (this->type == VEH_TRAIN) {
      uint max_width = ScaleSpriteTrad(VEHICLEINFO_FULL_VEHICLE_WIDTH);
      for (uint num = 0; num < this->vehicle_list.size(); num++) {
        uint width = 0;
        for (const Train *v = Train::From(this->vehicle_list[num]); v != nullptr; v = v->Next()) {
          width += v->GetDisplayImageWidth();
        }
        max_width = std::max(max_width, width);
      }
      /* Always have 1 empty row, so people can change the setting of the train */
      this->vscroll->SetCount(this->vehicle_list.size() + this->wagon_list.size() + 1);
      /* Always make it longer than the longest train, so you can attach vehicles at the end, and also see the next vertical tile separator line */
      this->hscroll->SetCount(max_width + ScaleSpriteTrad(2 * VEHICLEINFO_FULL_VEHICLE_WIDTH + 1));
    } else {
      this->vscroll->SetCount(CeilDiv((uint)this->vehicle_list.size(), this->num_columns));
    }
 
    /* Setup disabled buttons. */
    TileIndex tile = this->window_number;
    this->SetWidgetsDisabledState(!IsTileOwner(tile, _local_company),
      WID_D_STOP_ALL,
      WID_D_START_ALL,
      WID_D_SELL,
      WID_D_SELL_CHAIN,
      WID_D_SELL_ALL,
      WID_D_BUILD,
      WID_D_CLONE,
      WID_D_RENAME,
      WID_D_AUTOREPLACE);
 
    this->DrawWidgets();
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_D_MATRIX: // List
        this->DepotClick(pt.x, pt.y);
        break;
 
      case WID_D_BUILD: // Build vehicle
        ResetObjectToPlace();
        ShowBuildVehicleWindow(this->window_number, this->type);
        break;
 
      case WID_D_CLONE: // Clone button
        this->SetWidgetDirty(WID_D_CLONE);
        this->ToggleWidgetLoweredState(WID_D_CLONE);
 
        if (this->IsWidgetLowered(WID_D_CLONE)) {
          static const CursorID clone_icons[] = {
            SPR_CURSOR_CLONE_TRAIN, SPR_CURSOR_CLONE_ROADVEH,
            SPR_CURSOR_CLONE_SHIP, SPR_CURSOR_CLONE_AIRPLANE
          };
 
          SetObjectToPlaceWnd(clone_icons[this->type], PAL_NONE, HT_VEHICLE, this);
        } else {
          ResetObjectToPlace();
        }
        break;
 
      case WID_D_LOCATION:
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(this->window_number);
        } else {
          ScrollMainWindowToTile(this->window_number);
        }
        break;
 
      case WID_D_RENAME: // Rename button
        SetDParam(0, this->type);
        SetDParam(1, Depot::GetByTile((TileIndex)this->window_number)->index);
        ShowQueryString(STR_DEPOT_NAME, STR_DEPOT_RENAME_DEPOT_CAPTION, MAX_LENGTH_DEPOT_NAME_CHARS, this, CS_ALPHANUMERAL, QSF_ENABLE_DEFAULT | QSF_LEN_IN_CHARS);
        break;
 
      case WID_D_STOP_ALL:
      case WID_D_START_ALL: {
        VehicleListIdentifier vli(VL_DEPOT_LIST, this->type, this->owner);
        Command<CMD_MASS_START_STOP>::Post(this->window_number, widget == WID_D_START_ALL, false, vli);
        break;
      }
 
      case WID_D_SELL_ALL:
        /* Only open the confirmation window if there are anything to sell */
        if (!this->vehicle_list.empty() || !this->wagon_list.empty()) {
          SetDParam(0, this->type);
          SetDParam(1, this->GetDepotIndex());
          ShowQuery(
            STR_DEPOT_CAPTION,
            STR_DEPOT_SELL_CONFIRMATION_TEXT,
            this,
            DepotSellAllConfirmationCallback
          );
        }
        break;
 
      case WID_D_VEHICLE_LIST:
        ShowVehicleListWindow(GetTileOwner(this->window_number), this->type, (TileIndex)this->window_number);
        break;
 
      case WID_D_AUTOREPLACE:
        Command<CMD_DEPOT_MASS_AUTOREPLACE>::Post(this->window_number, this->type);
        break;
 
    }
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    if (!str.has_value()) return;
 
    /* Do depot renaming */
    Command<CMD_RENAME_DEPOT>::Post(STR_ERROR_CAN_T_RENAME_DEPOT, this->GetDepotIndex(), *str);
  }
 
  bool OnRightClick([[maybe_unused]] Point pt, WidgetID widget) override
  {
    if (widget != WID_D_MATRIX) return false;
 
    GetDepotVehiclePtData gdvp = { nullptr, nullptr };
    const Vehicle *v = nullptr;
    DepotGUIAction mode = this->GetVehicleFromDepotWndPt(pt.x, pt.y, &v, &gdvp);
 
    if (this->type == VEH_TRAIN) v = gdvp.wagon;
 
    if (v == nullptr || mode != MODE_DRAG_VEHICLE) return false;
 
    CargoArray capacity{}, loaded{};
 
    /* Display info for single (articulated) vehicle, or for whole chain starting with selected vehicle */
    bool whole_chain = (this->type == VEH_TRAIN && _ctrl_pressed);
 
    /* loop through vehicle chain and collect cargoes */
    uint num = 0;
    for (const Vehicle *w = v; w != nullptr; w = w->Next()) {
      if (w->cargo_cap > 0 && w->cargo_type < NUM_CARGO) {
        capacity[w->cargo_type] += w->cargo_cap;
        loaded  [w->cargo_type] += w->cargo.StoredCount();
      }
 
      if (w->type == VEH_TRAIN && !w->HasArticulatedPart()) {
        num++;
        if (!whole_chain) break;
      }
    }
 
    /* Build tooltipstring */
    static std::string details;
    details.clear();
 
    for (const CargoSpec *cs : _sorted_cargo_specs) {
      CargoID cargo_type = cs->Index();
      if (capacity[cargo_type] == 0) continue;
 
      SetDParam(0, cargo_type);           // {CARGO} #1
      SetDParam(1, loaded[cargo_type]);   // {CARGO} #2
      SetDParam(2, cargo_type);           // {SHORTCARGO} #1
      SetDParam(3, capacity[cargo_type]); // {SHORTCARGO} #2
      details += GetString(STR_DEPOT_VEHICLE_TOOLTIP_CARGO);
    }
 
    /* Show tooltip window */
    SetDParam(0, whole_chain ? num : v->engine_type);
    SetDParamStr(1, details);
    GuiShowTooltips(this, whole_chain ? STR_DEPOT_VEHICLE_TOOLTIP_CHAIN : STR_DEPOT_VEHICLE_TOOLTIP, TCC_RIGHT_CLICK, 2);
 
    return true;
  }
 
  bool OnVehicleSelect(const Vehicle *v) override
  {
    if (_ctrl_pressed) {
      /* Share-clone, do not open new viewport, and keep tool active */
      Command<CMD_CLONE_VEHICLE>::Post(STR_ERROR_CAN_T_BUY_TRAIN + v->type, this->window_number, v->index, true);
    } else {
      /* Copy-clone, open viewport for new vehicle, and deselect the tool (assume player wants to change things on new vehicle) */
      if (Command<CMD_CLONE_VEHICLE>::Post(STR_ERROR_CAN_T_BUY_TRAIN + v->type, CcCloneVehicle, this->window_number, v->index, false)) {
        ResetObjectToPlace();
      }
    }
 
    return true;
  }
 
  bool OnVehicleSelect(VehicleList::const_iterator begin, VehicleList::const_iterator end) override
  {
    if (!_ctrl_pressed) {
      /* If CTRL is not pressed: If all the vehicles in this list have the same orders, then copy orders */
      if (AllEqual(begin, end, [](const Vehicle *v1, const Vehicle *v2) {
        return VehiclesHaveSameEngineList(v1, v2);
      })) {
        if (AllEqual(begin, end, [](const Vehicle *v1, const Vehicle *v2) {
          return VehiclesHaveSameOrderList(v1, v2);
        })) {
          OnVehicleSelect(*begin);
        } else {
          ShowErrorMessage(STR_ERROR_CAN_T_BUY_TRAIN + (*begin)->type, STR_ERROR_CAN_T_COPY_ORDER_VEHICLE_LIST, WL_INFO);
        }
      } else {
        ShowErrorMessage(STR_ERROR_CAN_T_BUY_TRAIN + (*begin)->type, STR_ERROR_CAN_T_CLONE_VEHICLE_LIST, WL_INFO);
      }
    } else {
      /* If CTRL is pressed: If all the vehicles in this list share orders, then copy orders */
      if (AllEqual(begin, end, [](const Vehicle *v1, const Vehicle *v2) {
        return VehiclesHaveSameEngineList(v1, v2);
      })) {
        if (AllEqual(begin, end, [](const Vehicle *v1, const Vehicle *v2) {
          return v1->FirstShared() == v2->FirstShared();
        })) {
          OnVehicleSelect(*begin);
        } else {
          ShowErrorMessage(STR_ERROR_CAN_T_BUY_TRAIN + (*begin)->type, STR_ERROR_CAN_T_SHARE_ORDER_VEHICLE_LIST, WL_INFO);
        }
      } else {
        ShowErrorMessage(STR_ERROR_CAN_T_BUY_TRAIN + (*begin)->type, STR_ERROR_CAN_T_CLONE_VEHICLE_LIST, WL_INFO);
      }
    }
 
    return true;
  }
 
  void OnPlaceObjectAbort() override
  {
    /* abort clone */
    this->RaiseWidget(WID_D_CLONE);
    this->SetWidgetDirty(WID_D_CLONE);
 
    /* abort drag & drop */
    this->sel = INVALID_VEHICLE;
    this->vehicle_over = INVALID_VEHICLE;
    this->SetWidgetDirty(WID_D_MATRIX);
 
    if (this->hovered_widget != -1) {
      this->SetWidgetLoweredState(this->hovered_widget, false);
      this->SetWidgetDirty(this->hovered_widget);
      this->hovered_widget = -1;
    }
  }
 
  void OnMouseDrag(Point pt, WidgetID widget) override
  {
    if (this->sel == INVALID_VEHICLE) return;
    if (widget != this->hovered_widget) {
      if (this->hovered_widget == WID_D_SELL || this->hovered_widget == WID_D_SELL_CHAIN) {
        this->SetWidgetLoweredState(this->hovered_widget, false);
        this->SetWidgetDirty(this->hovered_widget);
      }
      this->hovered_widget = widget;
      if (this->hovered_widget == WID_D_SELL || this->hovered_widget == WID_D_SELL_CHAIN) {
        this->SetWidgetLoweredState(this->hovered_widget, true);
        this->SetWidgetDirty(this->hovered_widget);
      }
    }
    if (this->type != VEH_TRAIN) return;
 
    /* A rail vehicle is dragged.. */
    if (widget != WID_D_MATRIX) { // ..outside of the depot matrix.
      if (this->vehicle_over != INVALID_VEHICLE) {
        this->vehicle_over = INVALID_VEHICLE;
        this->SetWidgetDirty(WID_D_MATRIX);
      }
      return;
    }
 
    const Vehicle *v = nullptr;
    GetDepotVehiclePtData gdvp = {nullptr, nullptr};
 
    if (this->GetVehicleFromDepotWndPt(pt.x, pt.y, &v, &gdvp) != MODE_DRAG_VEHICLE) return;
 
    VehicleID new_vehicle_over = INVALID_VEHICLE;
    if (gdvp.head != nullptr) {
      if (gdvp.wagon == nullptr && gdvp.head->Last()->index != this->sel) { // ..at the end of the train.
        /* NOTE: As a wagon can't be moved at the begin of a train, head index isn't used to mark a drag-and-drop
         * destination inside a train. This head index is then used to indicate that a wagon is inserted at
         * the end of the train.
         */
        new_vehicle_over = gdvp.head->index;
      } else if (gdvp.wagon != nullptr && gdvp.head != gdvp.wagon &&
          gdvp.wagon->index != this->sel &&
          gdvp.wagon->Previous()->index != this->sel) { // ..over an existing wagon.
        new_vehicle_over = gdvp.wagon->index;
      }
    }
 
    if (this->vehicle_over == new_vehicle_over) return;
 
    this->vehicle_over = new_vehicle_over;
    this->SetWidgetDirty(widget);
  }
 
  void OnDragDrop(Point pt, WidgetID widget) override
  {
    switch (widget) {
      case WID_D_MATRIX: {
        const Vehicle *v = nullptr;
        VehicleID sel = this->sel;
 
        this->sel = INVALID_VEHICLE;
        this->SetDirty();
 
        if (this->type == VEH_TRAIN) {
          GetDepotVehiclePtData gdvp = { nullptr, nullptr };
 
          if (this->GetVehicleFromDepotWndPt(pt.x, pt.y, &v, &gdvp) == MODE_DRAG_VEHICLE && sel != INVALID_VEHICLE) {
            if (gdvp.wagon != nullptr && gdvp.wagon->index == sel && _ctrl_pressed) {
              Command<CMD_REVERSE_TRAIN_DIRECTION>::Post(STR_ERROR_CAN_T_REVERSE_DIRECTION_RAIL_VEHICLE, Vehicle::Get(sel)->tile, Vehicle::Get(sel)->index, true);
            } else if (gdvp.wagon == nullptr || gdvp.wagon->index != sel) {
              this->vehicle_over = INVALID_VEHICLE;
              TrainDepotMoveVehicle(gdvp.wagon, sel, gdvp.head);
            } else if (gdvp.head != nullptr && gdvp.head->IsFrontEngine()) {
              ShowVehicleViewWindow(gdvp.head);
            }
          }
        } else if (this->GetVehicleFromDepotWndPt(pt.x, pt.y, &v, nullptr) == MODE_DRAG_VEHICLE && v != nullptr && sel == v->index) {
          ShowVehicleViewWindow(v);
        }
        break;
      }
 
      case WID_D_SELL: case WID_D_SELL_CHAIN: {
        if (this->IsWidgetDisabled(widget)) return;
        if (this->sel == INVALID_VEHICLE) return;
 
        this->HandleButtonClick(widget);
 
        const Vehicle *v = Vehicle::Get(this->sel);
        this->sel = INVALID_VEHICLE;
        this->SetDirty();
 
        bool sell_cmd = (v->type == VEH_TRAIN && (widget == WID_D_SELL_CHAIN || _ctrl_pressed));
        Command<CMD_SELL_VEHICLE>::Post(GetCmdSellVehMsg(v->type), v->tile, v->index, sell_cmd, true, INVALID_CLIENT_ID);
        break;
      }
 
      default:
        this->sel = INVALID_VEHICLE;
        this->SetDirty();
        break;
    }
    this->hovered_widget = -1;
    _cursor.vehchain = false;
  }
 
  void OnTimeout() override
  {
    if (!this->IsWidgetDisabled(WID_D_SELL)) {
      this->RaiseWidget(WID_D_SELL);
      this->SetWidgetDirty(WID_D_SELL);
    }
    if (this->GetWidget<NWidgetBase>(WID_D_SELL) != nullptr && !this->IsWidgetDisabled(WID_D_SELL_CHAIN)) {
      this->RaiseWidget(WID_D_SELL_CHAIN);
      this->SetWidgetDirty(WID_D_SELL_CHAIN);
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_D_MATRIX);
    NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_D_MATRIX);
    if (this->type == VEH_TRAIN) {
      this->hscroll->SetCapacity(nwi->current_x - this->header_width - this->count_width);
    } else {
      this->num_columns = nwi->current_x / nwi->resize_x;
    }
  }
 
  EventState OnCTRLStateChange() override
  {
    if (this->sel != INVALID_VEHICLE) {
      _cursor.vehchain = _ctrl_pressed;
      this->SetWidgetDirty(WID_D_MATRIX);
      return ES_HANDLED;
    }
 
    return ES_NOT_HANDLED;
  }
 
  inline uint16_t GetDepotIndex() const
  {
    return (this->type == VEH_AIRCRAFT) ? ::GetStationIndex(this->window_number) : ::GetDepotIndex(this->window_number);
  }
};
 
static void DepotSellAllConfirmationCallback(Window *win, bool confirmed)
{
  if (confirmed) {
    DepotWindow *w = (DepotWindow*)win;
    TileIndex tile = w->window_number;
    VehicleType vehtype = w->type;
    Command<CMD_DEPOT_SELL_ALL_VEHICLES>::Post(tile, vehtype);
  }
}
 
void ShowDepotWindow(TileIndex tile, VehicleType type)
{
  if (BringWindowToFrontById(WC_VEHICLE_DEPOT, tile) != nullptr) return;
 
  switch (type) {
    default: NOT_REACHED();
    case VEH_TRAIN:    new DepotWindow(_train_depot_desc, tile, type);    break;
    case VEH_ROAD:     new DepotWindow(_road_depot_desc, tile, type);     break;
    case VEH_SHIP:     new DepotWindow(_ship_depot_desc, tile, type);     break;
    case VEH_AIRCRAFT: new DepotWindow(_aircraft_depot_desc, tile, type); break;
  }
}
 
void DeleteDepotHighlightOfVehicle(const Vehicle *v)
{
  DepotWindow *w;
 
  /* If we haven't got any vehicles on the mouse pointer, we haven't got any highlighted in any depots either
   * If that is the case, we can skip looping though the windows and save time
   */
  if (_special_mouse_mode != WSM_DRAGDROP) return;
 
  w = dynamic_cast<DepotWindow*>(FindWindowById(WC_VEHICLE_DEPOT, v->tile));
  if (w != nullptr) {
    if (w->sel == v->index) ResetObjectToPlace();
  }
}