Method DropdownWindow

src/dropdown.cpp:102–123

* Create a dropdown menu. * @param parent Parent window. * @param list Dropdown item list. * @param selected Initial selected result of the list. * @param button Widget of the parent window doing the dropdown. * @param wi_rect Rect of the button that opened the dropdown. * @param wi_colour Colour of the parent widget. * @param options Drop Down o

	 * @param options Drop Down options for this menu.
	 */
	DropdownWindow(Window *parent, DropDownList &&list, int selected, WidgetID button, const Rect wi_rect, Colours wi_colour, DropDownOptions options)
			: Window(_dropdown_desc)
			, parent_button(button)
			, wi_rect(wi_rect)
			, list(std::move(list))
			, selected_result(selected)
			, options(options)
	{
		assert(!this->list.empty());

		this->parent = parent;

		this->CreateNestedTree();

		this->GetWidget<NWidgetCore>(WID_DM_ITEMS)->colour = wi_colour;
		this->GetWidget<NWidgetCore>(WID_DM_SCROLL)->colour = wi_colour;
		this->vscroll = this->GetScrollbar(WID_DM_SCROLL);
		this->UpdateSizeAndPosition();

		this->FinishInitNested(0);
		this->flags.Reset(WindowFlag::WhiteBorder);
	}

	void Close([[maybe_unused]] int data = 0) override
	{