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