Function DrawButtonDropdown

src/widget.cpp:766–779

* Draw a button with a dropdown (#WWT_DROPDOWN and #NWID_BUTTON_DROPDOWN). * @param r Rectangle containing the widget. * @param colour Background colour of the widget. * @param clicked_button The button-part is clicked. * @param clicked_dropdown The drop-down part is clicked. * @param str Text of the button. * @param align Alignment of the t

 * @note Magic constants are also used in #NWidgetLeaf::ButtonHit.
 */
static inline void DrawButtonDropdown(const Rect &r, Colours colour, bool clicked_button, bool clicked_dropdown, std::string_view str, StringAlignment align)
{
	bool rtl = _current_text_dir == TD_RTL;

	Rect text = r.Indent(NWidgetLeaf::dropdown_dimension.width, !rtl);
	DrawFrameRect(text, colour, clicked_button ? FrameFlag::Lowered : FrameFlags{});
	if (!str.empty()) {
		text = text.CentreToHeight(GetCharacterHeight(FS_NORMAL)).Shrink(WidgetDimensions::scaled.dropdowntext, RectPadding::zero);
		DrawString(text, str, TC_BLACK, align);
	}

	Rect button = r.WithWidth(NWidgetLeaf::dropdown_dimension.width, !rtl);
	DrawImageButtons(button, WWT_DROPDOWN, colour, clicked_dropdown, SPR_ARROW_DOWN, SA_CENTER);
}

/**
 * Paint all widgets of a window.