(svn r26804) -Feature: Allow hiding of non-interesting engines in the build vehicle GUI.

6 files changed, 106 insertions, 12 deletions

diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
index 385f3829e..981f664c6 100644
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -58,13 +58,13 @@ static const NWidgetPart _nested_build_vehicle_widgets[] = {
 		NWidget(WWT_STICKYBOX, COLOUR_GREY),
 	EndContainer(),
 	NWidget(WWT_PANEL, COLOUR_GREY),
-		NWidget(NWID_HORIZONTAL),
-			NWidget(NWID_VERTICAL),
-				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_BV_SORT_ASSENDING_DESCENDING), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0),
-				NWidget(NWID_SPACER), SetFill(1, 1),
-			EndContainer(),
-			NWidget(NWID_VERTICAL),
+		NWidget(NWID_VERTICAL),
+			NWidget(NWID_HORIZONTAL),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_BV_SORT_ASSENDING_DESCENDING), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
 				NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_BV_SORT_DROPDOWN), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_SORT_CRITERIA),
+			EndContainer(),
+			NWidget(NWID_HORIZONTAL),
+				NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BV_SHOW_HIDDEN_ENGINES),
 				NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_BV_CARGO_FILTER_DROPDOWN), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_FILTER_CRITERIA),
 			EndContainer(),
 		EndContainer(),
@@ -81,6 +81,7 @@ static const NWidgetPart _nested_build_vehicle_widgets[] = {
 		NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BV_BUILD_SEL),
 			NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_BV_BUILD), SetResize(1, 0), SetFill(1, 0),
 		EndContainer(),
+		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_BV_SHOW_HIDE), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_JUST_STRING, STR_NULL),
 		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_BV_RENAME), SetResize(1, 0), SetFill(1, 0),
 		NWidget(WWT_RESIZEBOX, COLOUR_GREY),
 	EndContainer(),
@@ -93,6 +94,7 @@ static const CargoID CF_NONE = CT_INVALID;  ///< Show only vehicles which do not
 bool _engine_sort_direction; ///< \c false = descending, \c true = ascending.
 byte _engine_sort_last_criteria[]       = {0, 0, 0, 0};                 ///< Last set sort criteria, for each vehicle type.
 bool _engine_sort_last_order[]          = {false, false, false, false}; ///< Last set direction of the sort order, for each vehicle type.
+bool _engine_sort_show_hidden_engines[] = {false, false, false, false}; ///< Last set 'show hidden engines' setting for each vehicle type.
 static CargoID _engine_sort_last_cargo_criteria[] = {CF_ANY, CF_ANY, CF_ANY, CF_ANY}; ///< Last set filter criteria, for each vehicle type.
 
 /**
@@ -915,8 +917,13 @@ void DrawEngineList(VehicleType type, int l, int r, int y, const GUIEngineList *
 		/* Note: num_engines is only used in the autoreplace GUI, so it is correct to use _local_company here. */
 		const uint num_engines = GetGroupNumEngines(_local_company, selected_group, engine);
 
+		const Engine *e = Engine::Get(engine);
+		bool hidden = HasBit(e->company_hidden, _local_company);
+		StringID str = hidden ? STR_HIDDEN_ENGINE_NAME : STR_ENGINE_NAME;
+		TextColour tc = (engine == selected_id) ? TC_WHITE : (TC_NO_SHADE | (hidden ? TC_GREY : TC_BLACK));
+
 		SetDParam(0, engine);
-		DrawString(text_left, text_right, y + normal_text_y_offset, STR_ENGINE_NAME, engine == selected_id ? TC_WHITE : TC_BLACK);
+		DrawString(text_left, text_right, y + normal_text_y_offset, str, tc);
 		DrawVehicleEngine(l, r, sprite_x, y + sprite_y_offset, engine, (show_count && num_engines == 0) ? PALETTE_CRASH : GetEnginePalette(engine, _local_company), EIT_PURCHASE);
 		if (show_count) {
 			SetDParam(0, num_engines);
@@ -958,6 +965,7 @@ struct BuildVehicleWindow : Window {
 	} filter;                                   ///< Filter to apply.
 	bool descending_sort_order;                 ///< Sort direction, @see _engine_sort_direction
 	byte sort_criteria;                         ///< Current sort criterium.
+	bool show_hidden_engines;                   ///< State of the 'show hidden engines' button.
 	bool listview_mode;                         ///< If set, only display the available vehicles and do not show a 'build' button.
 	EngineID sel_engine;                        ///< Currently selected engine, or #INVALID_ENGINE
 	EngineID rename_engine;                     ///< Engine being renamed.
@@ -977,6 +985,7 @@ struct BuildVehicleWindow : Window {
 
 		this->sort_criteria         = _engine_sort_last_criteria[type];
 		this->descending_sort_order = _engine_sort_last_order[type];
+		this->show_hidden_engines   = _engine_sort_show_hidden_engines[type];
 
 		switch (type) {
 			default: NOT_REACHED();
@@ -1006,6 +1015,9 @@ struct BuildVehicleWindow : Window {
 		NWidgetCore *widget = this->GetWidget<NWidgetCore>(WID_BV_LIST);
 		widget->tool_tip = STR_BUY_VEHICLE_TRAIN_LIST_TOOLTIP + type;
 
+		widget = this->GetWidget<NWidgetCore>(WID_BV_SHOW_HIDE);
+		widget->tool_tip = STR_BUY_VEHICLE_TRAIN_HIDE_SHOW_TOGGLE_TOOLTIP + type;
+
 		widget = this->GetWidget<NWidgetCore>(WID_BV_BUILD);
 		widget->widget_data = STR_BUY_VEHICLE_TRAIN_BUY_VEHICLE_BUTTON + type;
 		widget->tool_tip    = STR_BUY_VEHICLE_TRAIN_BUY_VEHICLE_TOOLTIP + type;
@@ -1014,6 +1026,11 @@ struct BuildVehicleWindow : Window {
 		widget->widget_data = STR_BUY_VEHICLE_TRAIN_RENAME_BUTTON + type;
 		widget->tool_tip    = STR_BUY_VEHICLE_TRAIN_RENAME_TOOLTIP + type;
 
+		widget = this->GetWidget<NWidgetCore>(WID_BV_SHOW_HIDDEN_ENGINES);
+		widget->widget_data = STR_SHOW_HIDDEN_ENGINES_VEHICLE_TRAIN + type;
+		widget->tool_tip    = STR_SHOW_HIDDEN_ENGINES_VEHICLE_TRAIN_TOOLTIP + type;
+		widget->SetLowered(this->show_hidden_engines);
+
 		this->details_height = ((this->vehicle_type == VEH_TRAIN) ? 10 : 9) * FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
 
 		this->FinishInitNested(tile == INVALID_TILE ? (int)type : tile);
@@ -1110,6 +1127,7 @@ struct BuildVehicleWindow : Window {
 		 * when engines become obsolete and are removed */
 		const Engine *e;
 		FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
+			if (!this->show_hidden_engines && e->IsHidden(_local_company)) continue;
 			EngineID eid = e->index;
 			const RailVehicleInfo *rvi = &e->u.rail;
 
@@ -1153,6 +1171,7 @@ struct BuildVehicleWindow : Window {
 
 		const Engine *e;
 		FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
+			if (!this->show_hidden_engines && e->IsHidden(_local_company)) continue;
 			EngineID eid = e->index;
 			if (!IsEngineBuildable(eid, VEH_ROAD, _local_company)) continue;
 			if (!HasBit(this->filter.roadtypes, HasBit(EngInfo(eid)->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD)) continue;
@@ -1171,6 +1190,7 @@ struct BuildVehicleWindow : Window {
 
 		const Engine *e;
 		FOR_ALL_ENGINES_OF_TYPE(e, VEH_SHIP) {
+			if (!this->show_hidden_engines && e->IsHidden(_local_company)) continue;
 			EngineID eid = e->index;
 			if (!IsEngineBuildable(eid, VEH_SHIP, _local_company)) continue;
 			*this->eng_list.Append() = eid;
@@ -1195,6 +1215,7 @@ struct BuildVehicleWindow : Window {
 		 * when planes become obsolete and are removed */
 		const Engine *e;
 		FOR_ALL_ENGINES_OF_TYPE(e, VEH_AIRCRAFT) {
+			if (!this->show_hidden_engines && e->IsHidden(_local_company)) continue;
 			EngineID eid = e->index;
 			if (!IsEngineBuildable(eid, VEH_AIRCRAFT, _local_company)) continue;
 			/* First VEH_END window_numbers are fake to allow a window open for all different types at once */
@@ -1248,12 +1269,24 @@ struct BuildVehicleWindow : Window {
 				this->SetDirty();
 				break;
 
+			case WID_BV_SHOW_HIDDEN_ENGINES:
+				this->show_hidden_engines ^= true;
+				_engine_sort_show_hidden_engines[this->vehicle_type] = this->show_hidden_engines;
+				this->eng_list.ForceRebuild();
+				this->SetWidgetLoweredState(widget, this->show_hidden_engines);
+				this->SetDirty();
+				break;
+
 			case WID_BV_LIST: {
 				uint i = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_BV_LIST);
 				size_t num_items = this->eng_list.Length();
 				this->sel_engine = (i < num_items) ? this->eng_list[i] : INVALID_ENGINE;
 				this->SetDirty();
-				if (click_count > 1 && !this->listview_mode) this->OnClick(pt, WID_BV_BUILD, 1);
+				if (_ctrl_pressed) {
+					this->OnClick(pt, WID_BV_SHOW_HIDE, 1);
+				} else if (click_count > 1 && !this->listview_mode) {
+					this->OnClick(pt, WID_BV_BUILD, 1);
+				}
 				break;
 			}
 
@@ -1265,6 +1298,14 @@ struct BuildVehicleWindow : Window {
 				ShowDropDownMenu(this, this->cargo_filter_texts, this->cargo_filter_criteria, WID_BV_CARGO_FILTER_DROPDOWN, 0, 0);
 				break;
 
+			case WID_BV_SHOW_HIDE: {
+				const Engine *e = (this->sel_engine == INVALID_ENGINE) ? NULL : Engine::Get(this->sel_engine);
+				if (e != NULL) {
+					DoCommandP(0, 0, this->sel_engine | (e->IsHidden(_current_company) ? 0 : (1u << 31)), CMD_SET_VEHICLE_VISIBILITY);
+				}
+				break;
+			}
+
 			case WID_BV_BUILD: {
 				EngineID sel_eng = this->sel_engine;
 				if (sel_eng != INVALID_ENGINE) {
@@ -1323,6 +1364,16 @@ struct BuildVehicleWindow : Window {
 			case WID_BV_CARGO_FILTER_DROPDOWN:
 				SetDParam(0, this->cargo_filter_texts[this->cargo_filter_criteria]);
 				break;
+
+			case WID_BV_SHOW_HIDE: {
+				const Engine *e = (this->sel_engine == INVALID_ENGINE) ? NULL : Engine::Get(this->sel_engine);
+				if (e != NULL && e->IsHidden(_local_company)) {
+					SetDParam(0, STR_BUY_VEHICLE_TRAIN_SHOW_TOGGLE_BUTTON + this->vehicle_type);
+				} else {
+					SetDParam(0, STR_BUY_VEHICLE_TRAIN_HIDE_TOGGLE_BUTTON + this->vehicle_type);
+				}
+				break;
+			}
 		}
 	}
 
@@ -1345,6 +1396,13 @@ struct BuildVehicleWindow : Window {
 				*size = maxdim(*size, d);
 				break;
 			}
+
+			case WID_BV_SHOW_HIDE:
+				*size = GetStringBoundingBox(STR_BUY_VEHICLE_TRAIN_HIDE_TOGGLE_BUTTON + this->vehicle_type);
+				*size = maxdim(*size, GetStringBoundingBox(STR_BUY_VEHICLE_TRAIN_SHOW_TOGGLE_BUTTON + this->vehicle_type));
+				size->width += padding.width;
+				size->height += padding.height;
+				break;
 		}
 	}
 
@@ -1366,6 +1424,8 @@ struct BuildVehicleWindow : Window {
 		this->GenerateBuildList();
 		this->vscroll->SetCount(this->eng_list.Length());
 
+		this->SetWidgetDisabledState(WID_BV_SHOW_HIDE, this->sel_engine == INVALID_ENGINE);
+
 		this->DrawWidgets();
 
 		if (!this->IsShaded()) {
diff --git a/src/engine_gui.h b/src/engine_gui.h
index 4fe88ec2c..fc0b7ad7d 100644
--- a/src/engine_gui.h
+++ b/src/engine_gui.h
@@ -35,6 +35,7 @@ void DrawAircraftEngine(int left, int right, int preferred_x, int y, EngineID en
 extern bool _engine_sort_direction;
 extern byte _engine_sort_last_criteria[];
 extern bool _engine_sort_last_order[];
+extern bool _engine_sort_show_hidden_engines[];
 extern const StringID _engine_sort_listing[][12];
 extern EngList_SortTypeFunction * const _engine_sort_functions[][11];
 
diff --git a/src/lang/english.txt b/src/lang/english.txt
index 31635ff0c..03795a935 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -248,6 +248,17 @@ STR_TOOLTIP_VSCROLL_BAR_SCROLLS_LIST                            :{BLACK}Scroll b
 STR_TOOLTIP_HSCROLL_BAR_SCROLLS_LIST                            :{BLACK}Scroll bar - scrolls list left/right
 STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC                              :{BLACK}Demolish buildings etc. on a square of land. Ctrl selects the area diagonally. Shift toggles building/showing cost estimate
 
+# Show engines button
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_TRAIN                           :{BLACK}Show hidden
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_ROAD_VEHICLE                    :{BLACK}Show hidden
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_SHIP                            :{BLACK}Show hidden
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_AIRCRAFT                        :{BLACK}Show hidden
+
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_TRAIN_TOOLTIP                   :{BLACK}By enabling this button, the hidden train vehicles are also displayed
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_ROAD_VEHICLE_TOOLTIP            :{BLACK}By enabling this button, the hidden road vehicles are also displayed
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_SHIP_TOOLTIP                    :{BLACK}By enabling this button, the hidden ships are also displayed
+STR_SHOW_HIDDEN_ENGINES_VEHICLE_AIRCRAFT_TOOLTIP                :{BLACK}By enabling this button, the hidden aircraft are also displayed
+
 # Query window
 STR_BUTTON_DEFAULT                                              :{BLACK}Default
 STR_BUTTON_CANCEL                                               :{BLACK}Cancel
@@ -3365,10 +3376,10 @@ STR_PURCHASE_INFO_ALL_BUT                                       :All but {CARGO_
 STR_PURCHASE_INFO_MAX_TE                                        :{BLACK}Max. Tractive Effort: {GOLD}{FORCE}
 STR_PURCHASE_INFO_AIRCRAFT_RANGE                                :{BLACK}Range: {GOLD}{COMMA} tiles
 
-STR_BUY_VEHICLE_TRAIN_LIST_TOOLTIP                              :{BLACK}Train vehicle selection list - click on vehicle for information
-STR_BUY_VEHICLE_ROAD_VEHICLE_LIST_TOOLTIP                       :{BLACK}Road vehicle selection list - click on vehicle for information
-STR_BUY_VEHICLE_SHIP_LIST_TOOLTIP                               :{BLACK}Ship selection list - click on ship for information
-STR_BUY_VEHICLE_AIRCRAFT_LIST_TOOLTIP                           :{BLACK}Aircraft selection list - click on aircraft for information
+STR_BUY_VEHICLE_TRAIN_LIST_TOOLTIP                              :{BLACK}Train vehicle selection list. Click on vehicle for information. Ctrl+Click for toggling hiding of the vehicle type
+STR_BUY_VEHICLE_ROAD_VEHICLE_LIST_TOOLTIP                       :{BLACK}Road vehicle selection list. Click on vehicle for information. Ctrl+Click for toggling hiding of the vehicle type
+STR_BUY_VEHICLE_SHIP_LIST_TOOLTIP                               :{BLACK}Ship selection list. Click on ship for information. Ctrl+Click for toggling hiding of the ship type
+STR_BUY_VEHICLE_AIRCRAFT_LIST_TOOLTIP                           :{BLACK}Aircraft selection list. Click on aircraft for information. Ctrl+Click for toggling hiding of the aircraft type
 
 STR_BUY_VEHICLE_TRAIN_BUY_VEHICLE_BUTTON                        :{BLACK}Buy Vehicle
 STR_BUY_VEHICLE_ROAD_VEHICLE_BUY_VEHICLE_BUTTON                 :{BLACK}Buy Vehicle
@@ -3390,6 +3401,21 @@ STR_BUY_VEHICLE_ROAD_VEHICLE_RENAME_TOOLTIP                     :{BLACK}Rename r
 STR_BUY_VEHICLE_SHIP_RENAME_TOOLTIP                             :{BLACK}Rename ship type
 STR_BUY_VEHICLE_AIRCRAFT_RENAME_TOOLTIP                         :{BLACK}Rename aircraft type
 
+STR_BUY_VEHICLE_TRAIN_HIDE_TOGGLE_BUTTON                        :{BLACK}Hide
+STR_BUY_VEHICLE_ROAD_VEHICLE_HIDE_TOGGLE_BUTTON                 :{BLACK}Hide
+STR_BUY_VEHICLE_SHIP_HIDE_TOGGLE_BUTTON                         :{BLACK}Hide
+STR_BUY_VEHICLE_AIRCRAFT_HIDE_TOGGLE_BUTTON                     :{BLACK}Hide
+
+STR_BUY_VEHICLE_TRAIN_SHOW_TOGGLE_BUTTON                        :{BLACK}Display
+STR_BUY_VEHICLE_ROAD_VEHICLE_SHOW_TOGGLE_BUTTON                 :{BLACK}Display
+STR_BUY_VEHICLE_SHIP_SHOW_TOGGLE_BUTTON                         :{BLACK}Display
+STR_BUY_VEHICLE_AIRCRAFT_SHOW_TOGGLE_BUTTON                     :{BLACK}Display
+
+STR_BUY_VEHICLE_TRAIN_HIDE_SHOW_TOGGLE_TOOLTIP                  :{BLACK}Toggle hiding/displaying of the train vehicle type
+STR_BUY_VEHICLE_ROAD_VEHICLE_HIDE_SHOW_TOGGLE_TOOLTIP           :{BLACK}Toggle hiding/displaying of the road vehicle type
+STR_BUY_VEHICLE_SHIP_HIDE_SHOW_TOGGLE_TOOLTIP                   :{BLACK}Toggle hiding/displaying of the ship type
+STR_BUY_VEHICLE_AIRCRAFT_HIDE_SHOW_TOGGLE_TOOLTIP               :{BLACK}Toggle hiding/displaying of the aircraft type
+
 STR_QUERY_RENAME_TRAIN_TYPE_CAPTION                             :{WHITE}Rename train vehicle type
 STR_QUERY_RENAME_ROAD_VEHICLE_TYPE_CAPTION                      :{WHITE}Rename road vehicle type
 STR_QUERY_RENAME_SHIP_TYPE_CAPTION                              :{WHITE}Rename ship type
@@ -4851,6 +4877,7 @@ STR_COMPANY_NAME                                                :{COMPANY}
 STR_COMPANY_NAME_COMPANY_NUM                                    :{COMPANY} {COMPANY_NUM}
 STR_DEPOT_NAME                                                  :{DEPOT}
 STR_ENGINE_NAME                                                 :{ENGINE}
+STR_HIDDEN_ENGINE_NAME                                          :{ENGINE} (hidden)
 STR_GROUP_NAME                                                  :{GROUP}
 STR_INDUSTRY_NAME                                               :{INDUSTRY}
 STR_PRESIDENT_NAME                                              :{PRESIDENT_NAME}
diff --git a/src/script/api/game/game_window.hpp.sq b/src/script/api/game/game_window.hpp.sq
index 174d4ecbc..14328ec00 100644
--- a/src/script/api/game/game_window.hpp.sq
+++ b/src/script/api/game/game_window.hpp.sq
@@ -242,10 +242,12 @@ void SQGSWindow_Register(Squirrel *engine)
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_SORT_ASSENDING_DESCENDING,          "WID_BV_SORT_ASSENDING_DESCENDING");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_SORT_DROPDOWN,                      "WID_BV_SORT_DROPDOWN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_CARGO_FILTER_DROPDOWN,              "WID_BV_CARGO_FILTER_DROPDOWN");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_SHOW_HIDDEN_ENGINES,                "WID_BV_SHOW_HIDDEN_ENGINES");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_LIST,                               "WID_BV_LIST");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_SCROLLBAR,                          "WID_BV_SCROLLBAR");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_PANEL,                              "WID_BV_PANEL");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_BUILD,                              "WID_BV_BUILD");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_SHOW_HIDE,                          "WID_BV_SHOW_HIDE");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_BUILD_SEL,                          "WID_BV_BUILD_SEL");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_BV_RENAME,                             "WID_BV_RENAME");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_C_PANEL,                               "WID_C_PANEL");
diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
index b42401f47..417283fd0 100644
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -978,10 +978,12 @@ public:
 		WID_BV_SORT_ASSENDING_DESCENDING             = ::WID_BV_SORT_ASSENDING_DESCENDING,             ///< Sort direction.
 		WID_BV_SORT_DROPDOWN                         = ::WID_BV_SORT_DROPDOWN,                         ///< Criteria of sorting dropdown.
 		WID_BV_CARGO_FILTER_DROPDOWN                 = ::WID_BV_CARGO_FILTER_DROPDOWN,                 ///< Cargo filter dropdown.
+		WID_BV_SHOW_HIDDEN_ENGINES                   = ::WID_BV_SHOW_HIDDEN_ENGINES,                   ///< Toggle whether to display the hidden vehicles.
 		WID_BV_LIST                                  = ::WID_BV_LIST,                                  ///< List of vehicles.
 		WID_BV_SCROLLBAR                             = ::WID_BV_SCROLLBAR,                             ///< Scrollbar of list.
 		WID_BV_PANEL                                 = ::WID_BV_PANEL,                                 ///< Button panel.
 		WID_BV_BUILD                                 = ::WID_BV_BUILD,                                 ///< Build panel.
+		WID_BV_SHOW_HIDE                             = ::WID_BV_SHOW_HIDE,                             ///< Button to hide or show the selected engine.
 		WID_BV_BUILD_SEL                             = ::WID_BV_BUILD_SEL,                             ///< Build button.
 		WID_BV_RENAME                                = ::WID_BV_RENAME,                                ///< Rename button.
 	};
diff --git a/src/widgets/build_vehicle_widget.h b/src/widgets/build_vehicle_widget.h
index 6acad3f81..142653ac6 100644
--- a/src/widgets/build_vehicle_widget.h
+++ b/src/widgets/build_vehicle_widget.h
@@ -18,10 +18,12 @@ enum BuildVehicleWidgets {
 	WID_BV_SORT_ASSENDING_DESCENDING, ///< Sort direction.
 	WID_BV_SORT_DROPDOWN,             ///< Criteria of sorting dropdown.
 	WID_BV_CARGO_FILTER_DROPDOWN,     ///< Cargo filter dropdown.
+	WID_BV_SHOW_HIDDEN_ENGINES,       ///< Toggle whether to display the hidden vehicles.
 	WID_BV_LIST,                      ///< List of vehicles.
 	WID_BV_SCROLLBAR,                 ///< Scrollbar of list.
 	WID_BV_PANEL,                     ///< Button panel.
 	WID_BV_BUILD,                     ///< Build panel.
+	WID_BV_SHOW_HIDE,                 ///< Button to hide or show the selected engine.
 	WID_BV_BUILD_SEL,                 ///< Build button.
 	WID_BV_RENAME,                    ///< Rename button.
 };