src/object_gui.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file object_gui.cpp The GUI for objects. */
  11
  12 #include "stdafx.h"
  13 #include "command_func.h"
  14 #include "newgrf.h"
  15 #include "newgrf_object.h"
  16 #include "newgrf_text.h"
  17 #include "strings_func.h"
  18 #include "viewport_func.h"
  19 #include "tilehighlight_func.h"
  20 #include "window_gui.h"
  21 #include "window_func.h"
  22 #include "zoom_func.h"
  23
  24 #include "widgets/object_widget.h"
  25
  26 #include "table/strings.h"
  27
  28 #include "safeguards.h"
  29
  30 static ObjectClassID _selected_object_class; ///< the currently visible object class
  31 static int _selected_object_index;           ///< the index of the selected object in the current class or -1
  32 static uint8 _selected_object_view;          ///< the view of the selected object
  33
  34 /** The window used for building objects. */
  35 class BuildObjectWindow : public Window {
  36         static const int OBJECT_MARGIN = 4; ///< The margin (in pixels) around an object.
  37         int line_height;                    ///< The height of a single line.
  38         int info_height;                    ///< The height of the info box.
  39         Scrollbar *vscroll;                 ///< The scrollbar.
  40
  41         /** Scroll #WID_BO_CLASS_LIST so that the selected object class is visible. */
  42         void EnsureSelectedObjectClassIsVisible()
  43         {
  44                 uint pos = 0;
  45                 for (int i = 0; i < _selected_object_class; i++) {
  46                         if (ObjectClass::Get((ObjectClassID) i)->GetUISpecCount() == 0) continue;
  47                         pos++;
  48                 }
  49                 this->vscroll->ScrollTowards(pos);
  50         }
  51
  52         /**
  53          * Tests whether the previously selected object can be selected.
  54          * @return \c true if the selected object is available, \c false otherwise.
  55          */
  56         bool CanRestoreSelectedObject()
  57         {
  58                 if (_selected_object_index == -1) return false;
  59
  60                 ObjectClass *sel_objclass = ObjectClass::Get(_selected_object_class);
  61                 if ((int)sel_objclass->GetSpecCount() <= _selected_object_index) return false;
  62
  63                 return sel_objclass->GetSpec(_selected_object_index)->IsAvailable();
  64         }
  65
  66         /**
  67          * Calculate the number of columns of the #WID_BO_SELECT_MATRIX widget.
  68          * @return Number of columns in the matrix.
  69          */
  70         uint GetMatrixColumnCount()
  71         {
  72                 const NWidgetBase *matrix = this->GetWidget<NWidgetBase>(WID_BO_SELECT_MATRIX);
  73                 return 1 + (matrix->current_x - matrix->smallest_x) / matrix->resize_x;
  74         }
  75
  76 public:
  77         BuildObjectWindow(WindowDesc *desc, WindowNumber number) : Window(desc), info_height(1)
  78         {
  79                 this->CreateNestedTree();
  80                 this->vscroll = this->GetScrollbar(WID_BO_SCROLLBAR);
  81                 this->FinishInitNested(number);
  82
  83                 ResetObjectToPlace();
  84
  85                 this->vscroll->SetPosition(0);
  86                 this->vscroll->SetCount(ObjectClass::GetUIClassCount());
  87
  88                 NWidgetMatrix *matrix = this->GetWidget<NWidgetMatrix>(WID_BO_SELECT_MATRIX);
  89                 matrix->SetScrollbar(this->GetScrollbar(WID_BO_SELECT_SCROLL));
  90
  91                 this->SelectOtherClass(_selected_object_class);
  92                 if (this->CanRestoreSelectedObject()) {
  93                         this->SelectOtherObject(_selected_object_index);
  94                 } else {
  95                         this->SelectFirstAvailableObject(true);
  96                 }
  97                 assert(ObjectClass::Get(_selected_object_class)->GetUISpecCount() > 0); // object GUI should be disables elsewise
  98                 this->EnsureSelectedObjectClassIsVisible();
  99                 this->GetWidget<NWidgetMatrix>(WID_BO_OBJECT_MATRIX)->SetCount(4);
 100         }
 101
 102         virtual void SetStringParameters(int widget) const
 103         {
 104                 switch (widget) {
 105                         case WID_BO_OBJECT_NAME: {
 106                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 107                                 SetDParam(0, spec != NULL ? spec->name : STR_EMPTY);
 108                                 break;
 109                         }
 110
 111                         case WID_BO_OBJECT_SIZE: {
 112                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 113                                 int size = spec == NULL ? 0 : spec->size;
 114                                 SetDParam(0, GB(size, HasBit(_selected_object_view, 0) ? 4 : 0, 4));
 115                                 SetDParam(1, GB(size, HasBit(_selected_object_view, 0) ? 0 : 4, 4));
 116                                 break;
 117                         }
 118
 119                         default: break;
 120                 }
 121         }
 122
 123         virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
 124         {
 125                 switch (widget) {
 126                         case WID_BO_CLASS_LIST: {
 127                                 for (uint i = 0; i < ObjectClass::GetClassCount(); i++) {
 128                                         ObjectClass *objclass = ObjectClass::Get((ObjectClassID)i);
 129                                         if (objclass->GetUISpecCount() == 0) continue;
 130                                         size->width = max(size->width, GetStringBoundingBox(objclass->name).width);
 131                                 }
 132                                 size->width += padding.width;
 133                                 this->line_height = FONT_HEIGHT_NORMAL + WD_MATRIX_TOP + WD_MATRIX_BOTTOM;
 134                                 resize->height = this->line_height;
 135                                 size->height = 5 * this->line_height;
 136                                 break;
 137                         }
 138
 139                         case WID_BO_OBJECT_NAME:
 140                         case WID_BO_OBJECT_SIZE:
 141                                 /* We do not want the window to resize when selecting objects; better clip texts */
 142                                 size->width = 0;
 143                                 break;
 144
 145                         case WID_BO_OBJECT_MATRIX: {
 146                                 /* Get the right amount of buttons based on the current spec. */
 147                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 148                                 if (spec != NULL) {
 149                                         if (spec->views >= 2) size->width  += resize->width;
 150                                         if (spec->views >= 4) size->height += resize->height;
 151                                 }
 152                                 resize->width = 0;
 153                                 resize->height = 0;
 154                                 break;
 155                         }
 156
 157                         case WID_BO_OBJECT_SPRITE: {
 158                                 bool two_wide = false;  // Whether there will be two widgets next to each other in the matrix or not.
 159                                 int height[2] = {0, 0}; // The height for the different views; in this case views 1/2 and 4.
 160
 161                                 /* Get the height and view information. */
 162                                 for (int i = 0; i < NUM_OBJECTS; i++) {
 163                                         const ObjectSpec *spec = ObjectSpec::Get(i);
 164                                         if (!spec->IsEverAvailable()) continue;
 165                                         two_wide |= spec->views >= 2;
 166                                         height[spec->views / 4] = max<int>(ObjectSpec::Get(i)->height, height[spec->views / 4]);
 167                                 }
 168
 169                                 /* Determine the pixel heights. */
 170                                 for (size_t i = 0; i < lengthof(height); i++) {
 171                                         height[i] *= ScaleGUITrad(TILE_HEIGHT);
 172                                         height[i] += ScaleGUITrad(TILE_PIXELS) + 2 * OBJECT_MARGIN;
 173                                 }
 174
 175                                 /* Now determine the size of the minimum widgets. When there are two columns, then
 176                                  * we want these columns to be slightly less wide. When there are two rows, then
 177                                  * determine the size of the widgets based on the maximum size for a single row
 178                                  * of widgets, or just the twice the widget height of the two row ones. */
 179                                 size->height = max(height[0], height[1] * 2 + 2);
 180                                 if (two_wide) {
 181                                         size->width  = (3 * ScaleGUITrad(TILE_PIXELS) + 2 * OBJECT_MARGIN) * 2 + 2;
 182                                 } else {
 183                                         size->width  = 4 * ScaleGUITrad(TILE_PIXELS) + 2 * OBJECT_MARGIN;
 184                                 }
 185
 186                                 /* Get the right size for the single widget based on the current spec. */
 187                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 188                                 if (spec != NULL) {
 189                                         if (spec->views >= 2) size->width  = size->width  / 2 - 1;
 190                                         if (spec->views >= 4) size->height = size->height / 2 - 1;
 191                                 }
 192                                 break;
 193                         }
 194
 195                         case WID_BO_INFO:
 196                                 size->height = this->info_height;
 197                                 break;
 198
 199                         case WID_BO_SELECT_MATRIX:
 200                                 fill->height = 1;
 201                                 resize->height = 1;
 202                                 break;
 203
 204                         case WID_BO_SELECT_IMAGE:
 205                                 size->width  = ScaleGUITrad(64) + 2;
 206                                 size->height = ScaleGUITrad(58) + 2;
 207                                 break;
 208
 209                         default: break;
 210                 }
 211         }
 212
 213         virtual void DrawWidget(const Rect &r, int widget) const
 214         {
 215                 switch (GB(widget, 0, 16)) {
 216                         case WID_BO_CLASS_LIST: {
 217                                 int y = r.top;
 218                                 uint pos = 0;
 219                                 for (uint i = 0; i < ObjectClass::GetClassCount(); i++) {
 220                                         ObjectClass *objclass = ObjectClass::Get((ObjectClassID)i);
 221                                         if (objclass->GetUISpecCount() == 0) continue;
 222                                         if (!this->vscroll->IsVisible(pos++)) continue;
 223                                         DrawString(r.left + WD_MATRIX_LEFT, r.right - WD_MATRIX_RIGHT, y + WD_MATRIX_TOP, objclass->name,
 224                                                         ((int)i == _selected_object_class) ? TC_WHITE : TC_BLACK);
 225                                         y += this->line_height;
 226                                 }
 227                                 break;
 228                         }
 229
 230                         case WID_BO_OBJECT_SPRITE: {
 231                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 232                                 if (spec == NULL) break;
 233
 234                                 /* Height of the selection matrix.
 235                                  * Depending on the number of views, the matrix has a 1x1, 1x2, 2x1 or 2x2 layout. To make the previews
 236                                  * look nice in all layouts, we use the 4x4 layout (smallest previews) as starting point. For the bigger
 237                                  * previews in the layouts with less views we add space homogeneously on all sides, so the 4x4 preview-rectangle
 238                                  * is centered in the 2x1, 1x2 resp. 1x1 buttons. */
 239                                 uint matrix_height = this->GetWidget<NWidgetMatrix>(WID_BO_OBJECT_MATRIX)->current_y;
 240
 241                                 DrawPixelInfo tmp_dpi;
 242                                 /* Set up a clipping area for the preview. */
 243                                 if (FillDrawPixelInfo(&tmp_dpi, r.left, r.top, r.right - r.left + 1, r.bottom - r.top + 1)) {
 244                                         DrawPixelInfo *old_dpi = _cur_dpi;
 245                                         _cur_dpi = &tmp_dpi;
 246                                         if (spec->grf_prop.grffile == NULL) {
 247                                                 extern const DrawTileSprites _objects[];
 248                                                 const DrawTileSprites *dts = &_objects[spec->grf_prop.local_id];
 249                                                 DrawOrigTileSeqInGUI((r.right - r.left) / 2 - 1, (r.bottom - r.top + matrix_height / 2) / 2 - OBJECT_MARGIN - ScaleGUITrad(TILE_PIXELS), dts, PAL_NONE);
 250                                         } else {
 251                                                 DrawNewObjectTileInGUI((r.right - r.left) / 2 - 1, (r.bottom - r.top + matrix_height / 2) / 2 - OBJECT_MARGIN - ScaleGUITrad(TILE_PIXELS), spec, GB(widget, 16, 16));
 252                                         }
 253                                         _cur_dpi = old_dpi;
 254                                 }
 255                                 break;
 256                         }
 257
 258                         case WID_BO_SELECT_IMAGE: {
 259                                 ObjectClass *objclass = ObjectClass::Get(_selected_object_class);
 260                                 int obj_index = objclass->GetIndexFromUI(GB(widget, 16, 16));
 261                                 if (obj_index < 0) break;
 262                                 const ObjectSpec *spec = objclass->GetSpec(obj_index);
 263                                 if (spec == NULL) break;
 264
 265                                 if (!spec->IsAvailable()) {
 266                                         GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK, FILLRECT_CHECKER);
 267                                 }
 268                                 DrawPixelInfo tmp_dpi;
 269                                 /* Set up a clipping area for the preview. */
 270                                 if (FillDrawPixelInfo(&tmp_dpi, r.left + 1, r.top, (r.right - 1) - (r.left + 1) + 1, r.bottom - r.top + 1)) {
 271                                         DrawPixelInfo *old_dpi = _cur_dpi;
 272                                         _cur_dpi = &tmp_dpi;
 273                                         if (spec->grf_prop.grffile == NULL) {
 274                                                 extern const DrawTileSprites _objects[];
 275                                                 const DrawTileSprites *dts = &_objects[spec->grf_prop.local_id];
 276                                                 DrawOrigTileSeqInGUI((r.right - r.left) / 2 - 1, r.bottom - r.top - OBJECT_MARGIN - ScaleGUITrad(TILE_PIXELS), dts, PAL_NONE);
 277                                         } else {
 278                                                 DrawNewObjectTileInGUI((r.right - r.left) / 2 - 1, r.bottom - r.top - OBJECT_MARGIN - ScaleGUITrad(TILE_PIXELS), spec,
 279                                                                 min(_selected_object_view, spec->views - 1));
 280                                         }
 281                                         _cur_dpi = old_dpi;
 282                                 }
 283                                 break;
 284                         }
 285
 286                         case WID_BO_INFO: {
 287                                 const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 288                                 if (spec == NULL) break;
 289
 290                                 /* Get the extra message for the GUI */
 291                                 if (HasBit(spec->callback_mask, CBM_OBJ_FUND_MORE_TEXT)) {
 292                                         uint16 callback_res = GetObjectCallback(CBID_OBJECT_FUND_MORE_TEXT, 0, 0, spec, NULL, INVALID_TILE, _selected_object_view);
 293                                         if (callback_res != CALLBACK_FAILED && callback_res != 0x400) {
 294                                                 if (callback_res > 0x400) {
 295                                                         ErrorUnknownCallbackResult(spec->grf_prop.grffile->grfid, CBID_OBJECT_FUND_MORE_TEXT, callback_res);
 296                                                 } else {
 297                                                         StringID message = GetGRFStringID(spec->grf_prop.grffile->grfid, 0xD000 + callback_res);
 298                                                         if (message != STR_NULL && message != STR_UNDEFINED) {
 299                                                                 StartTextRefStackUsage(spec->grf_prop.grffile, 6);
 300                                                                 /* Use all the available space left from where we stand up to the
 301                                                                  * end of the window. We ALSO enlarge the window if needed, so we
 302                                                                  * can 'go' wild with the bottom of the window. */
 303                                                                 int y = DrawStringMultiLine(r.left, r.right, r.top, UINT16_MAX, message, TC_ORANGE) - r.top;
 304                                                                 StopTextRefStackUsage();
 305                                                                 if (y > this->info_height) {
 306                                                                         BuildObjectWindow *bow = const_cast<BuildObjectWindow *>(this);
 307                                                                         bow->info_height = y + 2;
 308                                                                         bow->ReInit();
 309                                                                 }
 310                                                         }
 311                                                 }
 312                                         }
 313                                 }
 314                         }
 315                 }
 316         }
 317
 318         /**
 319          * Select the specified object class.
 320          * @param object_class_index Object class index to select.
 321          */
 322         void SelectOtherClass(ObjectClassID object_class_index)
 323         {
 324                 _selected_object_class = object_class_index;
 325                 this->GetWidget<NWidgetMatrix>(WID_BO_SELECT_MATRIX)->SetCount(ObjectClass::Get(_selected_object_class)->GetUISpecCount());
 326         }
 327
 328         /**
 329          * Select the specified object in #_selected_object_class class.
 330          * @param object_index Object index to select, \c -1 means select nothing.
 331          */
 332         void SelectOtherObject(int object_index)
 333         {
 334                 _selected_object_index = object_index;
 335                 if (_selected_object_index != -1) {
 336                         const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 337                         _selected_object_view = min(_selected_object_view, spec->views - 1);
 338                         this->ReInit();
 339                 } else {
 340                         _selected_object_view = 0;
 341                 }
 342
 343                 if (_selected_object_index != -1) {
 344                         SetObjectToPlaceWnd(SPR_CURSOR_TRANSMITTER, PAL_NONE, HT_RECT, this);
 345                 }
 346
 347                 this->UpdateButtons(_selected_object_class, _selected_object_index, _selected_object_view);
 348         }
 349
 350         void UpdateSelectSize()
 351         {
 352                 if (_selected_object_index == -1) {
 353                         SetTileSelectSize(1, 1);
 354                 } else {
 355                         const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 356                         int w = GB(spec->size, HasBit(_selected_object_view, 0) ? 4 : 0, 4);
 357                         int h = GB(spec->size, HasBit(_selected_object_view, 0) ? 0 : 4, 4);
 358                         SetTileSelectSize(w, h);
 359                 }
 360         }
 361
 362         /**
 363          * Update buttons to show the selection to the user.
 364          * @param sel_class The class of the selected object.
 365          * @param sel_index Index of the object to select, or \c -1 .
 366          * @param sel_view View of the object to select.
 367          */
 368         void UpdateButtons(ObjectClassID sel_class, int sel_index, uint sel_view)
 369         {
 370                 int view_number, object_number;
 371                 if (sel_index == -1) {
 372                         view_number = -1; // If no object selected, also hide the selected view.
 373                         object_number = -1;
 374                 } else {
 375                         view_number = sel_view;
 376                         object_number = ObjectClass::Get(sel_class)->GetUIFromIndex(sel_index);
 377                 }
 378
 379                 this->GetWidget<NWidgetMatrix>(WID_BO_OBJECT_MATRIX)->SetClicked(view_number);
 380                 this->GetWidget<NWidgetMatrix>(WID_BO_SELECT_MATRIX)->SetClicked(object_number);
 381                 this->UpdateSelectSize();
 382                 this->SetDirty();
 383         }
 384
 385         virtual void OnResize()
 386         {
 387                 this->vscroll->SetCapacityFromWidget(this, WID_BO_CLASS_LIST);
 388         }
 389
 390         virtual void OnClick(Point pt, int widget, int click_count)
 391         {
 392                 switch (GB(widget, 0, 16)) {
 393                         case WID_BO_CLASS_LIST: {
 394                                 int num_clicked = this->vscroll->GetPosition() + (pt.y - this->nested_array[widget]->pos_y) / this->line_height;
 395                                 if (num_clicked >= (int)ObjectClass::GetUIClassCount()) break;
 396
 397                                 this->SelectOtherClass(ObjectClass::GetUIClass(num_clicked));
 398                                 this->SelectFirstAvailableObject(false);
 399                                 break;
 400                         }
 401
 402                         case WID_BO_SELECT_IMAGE: {
 403                                 ObjectClass *objclass = ObjectClass::Get(_selected_object_class);
 404                                 int num_clicked = objclass->GetIndexFromUI(GB(widget, 16, 16));
 405                                 if (num_clicked >= 0 && objclass->GetSpec(num_clicked)->IsAvailable()) this->SelectOtherObject(num_clicked);
 406                                 break;
 407                         }
 408
 409                         case WID_BO_OBJECT_SPRITE:
 410                                 if (_selected_object_index != -1) {
 411                                         _selected_object_view = GB(widget, 16, 16);
 412                                         this->SelectOtherObject(_selected_object_index); // Re-select the object for a different view.
 413                                 }
 414                                 break;
 415                 }
 416         }
 417
 418         virtual void OnPlaceObject(Point pt, TileIndex tile)
 419         {
 420                 DoCommandP(tile, ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index)->Index(),
 421                                 _selected_object_view, CMD_BUILD_OBJECT | CMD_MSG(STR_ERROR_CAN_T_BUILD_OBJECT), CcTerraform);
 422         }
 423
 424         virtual void OnPlaceObjectAbort()
 425         {
 426                 this->UpdateButtons(_selected_object_class, -1, _selected_object_view);
 427         }
 428
 429         /**
 430          * Select the first available object.
 431          * @param change_class If true, change the class if no object in the current
 432          *   class is available.
 433          */
 434         void SelectFirstAvailableObject(bool change_class)
 435         {
 436                 /* First try to select an object in the selected class. */
 437                 ObjectClass *sel_objclass = ObjectClass::Get(_selected_object_class);
 438                 for (uint i = 0; i < sel_objclass->GetSpecCount(); i++) {
 439                         const ObjectSpec *spec = sel_objclass->GetSpec(i);
 440                         if (spec->IsAvailable()) {
 441                                 this->SelectOtherObject(i);
 442                                 return;
 443                         }
 444                 }
 445                 if (change_class) {
 446                         /* If that fails, select the first available object
 447                          * from a random class. */
 448                         for (ObjectClassID j = OBJECT_CLASS_BEGIN; j < OBJECT_CLASS_MAX; j++) {
 449                                 ObjectClass *objclass = ObjectClass::Get(j);
 450                                 for (uint i = 0; i < objclass->GetSpecCount(); i++) {
 451                                         const ObjectSpec *spec = objclass->GetSpec(i);
 452                                         if (spec->IsAvailable()) {
 453                                                 this->SelectOtherClass(j);
 454                                                 this->SelectOtherObject(i);
 455                                                 return;
 456                                         }
 457                                 }
 458                         }
 459                 }
 460                 /* If all objects are unavailable, select nothing... */
 461                 if (ObjectClass::Get(_selected_object_class)->GetUISpecCount() == 0) {
 462                         /* ... but make sure that the class is not empty. */
 463                         for (ObjectClassID j = OBJECT_CLASS_BEGIN; j < OBJECT_CLASS_MAX; j++) {
 464                                 if (ObjectClass::Get(j)->GetUISpecCount() > 0) {
 465                                         this->SelectOtherClass(j);
 466                                         break;
 467                                 }
 468                         }
 469                 }
 470                 this->SelectOtherObject(-1);
 471         }
 472 };
 473
 474 static const NWidgetPart _nested_build_object_widgets[] = {
 475         NWidget(NWID_HORIZONTAL),
 476                 NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
 477                 NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_OBJECT_BUILD_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
 478                 NWidget(WWT_DEFSIZEBOX, COLOUR_DARK_GREEN),
 479         EndContainer(),
 480         NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
 481                 NWidget(NWID_HORIZONTAL), SetPadding(2, 0, 0, 0),
 482                         NWidget(NWID_VERTICAL),
 483                                 NWidget(NWID_HORIZONTAL), SetPadding(0, 5, 2, 5),
 484                                         NWidget(WWT_MATRIX, COLOUR_GREY, WID_BO_CLASS_LIST), SetFill(1, 0), SetMatrixDataTip(1, 0, STR_OBJECT_BUILD_CLASS_TOOLTIP), SetScrollbar(WID_BO_SCROLLBAR),
 485                                         NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_BO_SCROLLBAR),
 486                                 EndContainer(),
 487                                 NWidget(NWID_HORIZONTAL), SetPadding(0, 5, 0, 5),
 488                                         NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BO_OBJECT_MATRIX), SetPIP(0, 2, 0),
 489                                                 NWidget(WWT_PANEL, COLOUR_GREY, WID_BO_OBJECT_SPRITE), SetDataTip(0x0, STR_OBJECT_BUILD_PREVIEW_TOOLTIP), EndContainer(),
 490                                         EndContainer(),
 491                                 EndContainer(),
 492                                 NWidget(WWT_TEXT, COLOUR_DARK_GREEN, WID_BO_OBJECT_NAME), SetDataTip(STR_ORANGE_STRING, STR_NULL), SetPadding(2, 5, 2, 5),
 493                                 NWidget(WWT_TEXT, COLOUR_DARK_GREEN, WID_BO_OBJECT_SIZE), SetDataTip(STR_OBJECT_BUILD_SIZE, STR_NULL), SetPadding(2, 5, 2, 5),
 494                         EndContainer(),
 495                         NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BO_SELECT_SCROLL),
 496                                 NWidget(NWID_HORIZONTAL),
 497                                         NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BO_SELECT_MATRIX), SetFill(0, 1), SetPIP(0, 2, 0),
 498                                                 NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BO_SELECT_IMAGE), SetMinimalSize(66, 60), SetDataTip(0x0, STR_OBJECT_BUILD_TOOLTIP),
 499                                                                 SetFill(0, 0), SetResize(0, 0), SetScrollbar(WID_BO_SELECT_SCROLL),
 500                                                 EndContainer(),
 501                                         EndContainer(),
 502                                         NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_BO_SELECT_SCROLL),
 503                                 EndContainer(),
 504                         EndContainer(),
 505                 EndContainer(),
 506                 NWidget(NWID_HORIZONTAL),
 507                         NWidget(WWT_EMPTY, INVALID_COLOUR, WID_BO_INFO), SetPadding(2, 5, 0, 5), SetFill(1, 0), SetResize(1, 0),
 508                         NWidget(NWID_VERTICAL),
 509                                 NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetFill(0, 1), EndContainer(),
 510                                 NWidget(WWT_RESIZEBOX, COLOUR_DARK_GREEN),
 511                         EndContainer(),
 512                 EndContainer(),
 513         EndContainer(),
 514 };
 515
 516 static WindowDesc _build_object_desc(
 517         WDP_AUTO, "build_object", 0, 0,
 518         WC_BUILD_OBJECT, WC_BUILD_TOOLBAR,
 519         WDF_CONSTRUCTION,
 520         _nested_build_object_widgets, lengthof(_nested_build_object_widgets)
 521 );
 522
 523 /**
 524  * Show our object picker.
 525  * @param w The toolbar window we're associated with.
 526  */
 527 void ShowBuildObjectPicker()
 528 {
 529         /* Don't show the place object button when there are no objects to place. */
 530         if (ObjectClass::GetUIClassCount() > 0) {
 531                 AllocateWindowDescFront<BuildObjectWindow>(&_build_object_desc, 0);
 532         }
 533 }
 534
 535 /** Reset all data of the object GUI. */
 536 void InitializeObjectGui()
 537 {
 538         _selected_object_class = (ObjectClassID)0;
 539 }