TBTR: Add train tooltips (right click and hover) in template edit window

src/tbtr_template_gui_create.cpp

@@ -78,7 +78,7 @@ static const NWidgetPart _widgets[] = {
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL),
 		NWidget(NWID_VERTICAL),
-			NWidget(WWT_PANEL, COLOUR_GREY, TCW_NEW_TMPL_PANEL), SetMinimalSize(250, 30), SetResize(1, 0), SetScrollbar(TCW_SCROLLBAR_H_NEW_TMPL), EndContainer(),
+			NWidget(WWT_PANEL, COLOUR_GREY, TCW_NEW_TMPL_PANEL), SetMinimalSize(250, 30), SetResize(1, 0), SetScrollbar(TCW_SCROLLBAR_H_NEW_TMPL), SetDataTip(STR_NULL, STR_DEPOT_TRAIN_LIST_TOOLTIP), EndContainer(),
 			NWidget(WWT_PANEL, COLOUR_GREY, TCW_INFO_PANEL), SetMinimalSize(250, 100), SetResize(1, 1), SetScrollbar(TCW_SCROLLBAR_V_NEW_TMPL), EndContainer(),
 			NWidget(NWID_HSCROLLBAR, COLOUR_GREY, TCW_SCROLLBAR_H_NEW_TMPL),
 		EndContainer(),
@@ -388,6 +388,61 @@ public:
 		}
 	}
 
+	virtual bool OnRightClick(Point pt, int widget) override
+	{
+		if (widget != TCW_NEW_TMPL_PANEL) return false;
+
+		GetDepotVehiclePtData gdvp = { nullptr, nullptr };
+		const Vehicle *v = nullptr;
+		NWidgetBase *nwi = this->GetWidget<NWidgetBase>(TCW_NEW_TMPL_PANEL);
+		DepotGUIAction mode = this->GetVehicleFromDepotWndPt(pt.x - nwi->pos_x, pt.y - nwi->pos_y, &v, &gdvp);
+		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 = _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 char details[1024];
+		details[0] = '\0';
+		char *pos = details;
+
+		for (CargoID cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
+			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
+			pos = GetString(pos, STR_DEPOT_VEHICLE_TOOLTIP_CARGO, lastof(details));
+		}
+
+		/* Show tooltip window */
+		uint64 args[2];
+		args[0] = (whole_chain ? num : v->engine_type);
+		args[1] = (uint64)(size_t)details;
+		GuiShowTooltips(this, whole_chain ? STR_DEPOT_VEHICLE_TOOLTIP_CHAIN : STR_DEPOT_VEHICLE_TOOLTIP, 2, args, TCC_RIGHT_CLICK);
+
+		return true;
+	}
+
 	virtual void OnDragDrop(Point pt, int widget) override
 	{
 		switch (widget) {