Method OnDropdownSelect

src/build_vehicle_gui.cpp:1899–1949

	}

	void OnDropdownSelect(WidgetID widget, int index, int click_result) override
	{
		switch (widget) {
			case WID_BV_SORT_DROPDOWN:
				if (this->sort_criteria != index) {
					this->sort_criteria = index;
					_engine_sort_last_criteria[this->vehicle_type] = this->sort_criteria;
					this->eng_list.ForceRebuild();
				}
				break;

			case WID_BV_CARGO_FILTER_DROPDOWN: // Select a cargo filter criteria
				if (this->cargo_filter_criteria != index) {
					this->cargo_filter_criteria = index;
					_engine_sort_last_cargo_criteria[this->vehicle_type] = this->cargo_filter_criteria;
					/* deactivate filter if criteria is 'Show All', activate it otherwise */
					this->eng_list.SetFilterState(this->cargo_filter_criteria != CargoFilterCriteria::CF_ANY);
					this->eng_list.ForceRebuild();
					this->SelectEngine(this->sel_engine);
				}
				break;

			case WID_BV_CONFIGURE_BADGES: {
				bool reopen = HandleBadgeConfigurationDropDownClick(static_cast<GrfSpecFeature>(GSF_TRAINS + this->vehicle_type), BADGE_COLUMNS, index, click_result, this->badge_filter_choices);

				this->ReInit();

				if (reopen) {
					ReplaceDropDownList(this, this->BuildBadgeConfigurationList(), -1);
				} else {
					this->CloseChildWindows(WC_DROPDOWN_MENU);
				}

				/* We need to refresh if a filter is removed. */
				this->eng_list.ForceRebuild();
				break;
			}

			default:
				if (IsInsideMM(widget, this->badge_filters.first, this->badge_filters.second)) {
					if (index < 0) {
						ResetBadgeFilter(this->badge_filter_choices, this->GetWidget<NWidgetBadgeFilter>(widget)->GetBadgeClassID());
					} else {
						SetBadgeFilter(this->badge_filter_choices, BadgeID(index));
					}
					this->eng_list.ForceRebuild();
				}
				break;
		}
		this->SetDirty();
	}

	void OnResize() override
	{