(svn r20856) -Fix [FS#4141]: Road/water toolbars did not get updated when the first vehicle of their type becomes available.

src/dock_gui.cpp

@@ -173,6 +173,7 @@ struct BuildDocksToolbarWindow : Window {
 	BuildDocksToolbarWindow(const WindowDesc *desc, WindowNumber window_number) : Window()
 	{
 		this->InitNested(desc, window_number);
+		this->OnInvalidateData();
 		if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
 	}
 
@@ -181,9 +182,17 @@ struct BuildDocksToolbarWindow : Window {
 		if (_settings_client.gui.link_terraform_toolbar) DeleteWindowById(WC_SCEN_LAND_GEN, 0, false);
 	}
 
+	void OnInvalidateData(int data = 0)
+	{
+		this->SetWidgetsDisabledState(!CanBuildVehicleInfrastructure(VEH_SHIP),
+			DTW_DEPOT,
+			DTW_STATION,
+			DTW_BUOY,
+			WIDGET_LIST_END);
+	}
+
 	virtual void OnPaint()
 	{
-		this->SetWidgetsDisabledState(!CanBuildVehicleInfrastructure(VEH_SHIP), DTW_DEPOT, DTW_STATION, DTW_BUOY, WIDGET_LIST_END);
 		this->DrawWidgets();
 	}
 

src/engine.cpp

@@ -605,6 +605,10 @@ static void AcceptEnginePreview(EngineID eid, CompanyID company)
 	if (company == _local_company) {
 		AddRemoveEngineFromAutoreplaceAndBuildWindows(e->type);
 	}
+
+	/* Update the toolbar. */
+	if (e->type == VEH_ROAD) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_ROAD);
+	if (e->type == VEH_SHIP) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_WATER);
 }
 
 /**
@@ -749,6 +753,10 @@ static void NewVehicleAvailable(Engine *e)
 	SetDParam(0, GetEngineCategoryName(index));
 	SetDParam(1, index);
 	AddNewsItem(STR_NEWS_NEW_VEHICLE_NOW_AVAILABLE_WITH_TYPE, NS_NEW_VEHICLES, NR_ENGINE, index);
+
+	/* Update the toolbar. */
+	if (e->type == VEH_ROAD) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_ROAD);
+	if (e->type == VEH_SHIP) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_WATER);
 }
 
 void EnginesMonthlyLoop()

src/road_gui.cpp

@@ -457,11 +457,7 @@ struct BuildRoadToolbarWindow : Window {
 			RTW_ONE_WAY,
 			WIDGET_LIST_END);
 
-		this->SetWidgetsDisabledState(!CanBuildVehicleInfrastructure(VEH_ROAD),
-			RTW_DEPOT,
-			RTW_BUS_STATION,
-			RTW_TRUCK_STATION,
-			WIDGET_LIST_END);
+		this->OnInvalidateData();
 
 		if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
 	}
@@ -471,6 +467,15 @@ struct BuildRoadToolbarWindow : Window {
 		if (_settings_client.gui.link_terraform_toolbar) DeleteWindowById(WC_SCEN_LAND_GEN, 0, false);
 	}
 
+	void OnInvalidateData(int data = 0)
+	{
+		this->SetWidgetsDisabledState(!CanBuildVehicleInfrastructure(VEH_ROAD),
+			RTW_DEPOT,
+			RTW_BUS_STATION,
+			RTW_TRUCK_STATION,
+			WIDGET_LIST_END);
+	}
+
 	/**
 	 * Update the remove button lowered state of the road toolbar
 	 *