Method DrawWidget

src/dropdown.cpp:259–293

	}

	void DrawWidget(const Rect &r, WidgetID widget) const override
	{
		if (widget != WID_DM_ITEMS) return;

		Colours colour = this->GetWidget<NWidgetCore>(widget)->colour;

		Rect ir = r.Shrink(WidgetDimensions::scaled.dropdownlist);

		/* Setup a clipping rectangle... */
		DrawPixelInfo tmp_dpi;
		if (!FillDrawPixelInfo(&tmp_dpi, ir)) return;
		/* ...but keep coordinates relative to the window. */
		tmp_dpi.left += ir.left;
		tmp_dpi.top += ir.top;
		AutoRestoreBackup dpi_backup(_cur_dpi, &tmp_dpi);

		int y = -this->vscroll->GetPosition();
		int y_end = ir.Height();

		for (const auto &item : this->list) {
			int item_height = item->Height();

			/* Skip items that are scrolled up */
			if (y > y_end) break;
			if (y > -item_height) {
				Rect full = ir.Translate(0, y).WithHeight(item_height);

				bool selected = (this->selected_result == item->result) && item->Selectable() && this->selected_click_result < 0;
				if (selected) GfxFillRect(full, PC_BLACK);

				item->Draw(full, full.Shrink(WidgetDimensions::scaled.dropdowntext, RectPadding::zero), selected, selected ? this->selected_click_result : -1, colour);
			}
			y += item_height;
		}
	}

	void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
	{