NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_DM_ITEMS);

		nwi->SetMinimalSizeAbsolute(items_width, size.height + WidgetDimensions::scaled.fullbevel.Vertical() * 2);

		nwi->colour = wi_colour;

		nwi = this->GetWidget<NWidgetCore>(WID_DM_SCROLL);

		nwi->colour = wi_colour;

		this->GetWidget<NWidgetStacked>(WID_DM_SHOW_SCROLL)->SetDisplayedPlane(scroll ? 0 : SZSP_NONE);

		this->FinishInitNested(0);

		CLRBITS(this->flags, WF_WHITE_BORDER);

		/* Total length of list */

		int list_height = 0;

		for (const auto &item : this->list) {

			list_height += item->Height(items_width);

		}

		/* Capacity is the average number of items visible */

		this->vscroll->SetCapacity(size.height * this->list.size() / list_height);

		this->vscroll->SetCount(this->list.size());

		this->parent           = parent;

		this->parent_button    = button;

		this->selected_index   = selected;

		this->click_delay      = 0;

		this->drag_mode        = true;

		this->instant_close    = instant_close;

	}

	void Close() override

	{

		/* Finish closing the dropdown, so it doesn't affect new window placement.

		 * Also mark it dirty in case the callback deals with the screen. (e.g. screenshots). */

		this->Window::Close();

		Point pt = _cursor.pos;

		pt.x -= this->parent->left;

		pt.y -= this->parent->top;

		this->parent->OnDropdownClose(pt, this->parent_button, this->selected_index, this->instant_close);

		/* Set flag on parent widget to indicate that we have just closed. */

		NWidgetCore *nwc = this->parent->GetWidget<NWidgetCore>(this->parent_button);

		if (nwc != nullptr) SetBit(nwc->disp_flags, NDB_DROPDOWN_CLOSED);

	}

	void OnFocusLost(bool closing) override

	{

	}

	Point OnInitialPosition(int16 sm_width, int16 sm_height, int window_number) override

	{

		return this->position;

	}

	/**

	 * Find the dropdown item under the cursor.

	 * @param[out] value Selected item, if function returns \c true.

	 * @return Cursor points to a dropdown item.

	 */

	bool GetDropDownItem(int &value)

	{

		if (GetWidgetFromPos(this, _cursor.pos.x - this->left, _cursor.pos.y - this->top) < 0) return false;

		const Rect &r = this->GetWidget<NWidgetBase>(WID_DM_ITEMS)->GetCurrentRect().Shrink(WidgetDimensions::scaled.fullbevel);

		int y     = _cursor.pos.y - this->top - r.top - WidgetDimensions::scaled.fullbevel.top;

		int width = r.Width();

		int pos   = this->vscroll->GetPosition();

		for (const auto &item : this->list) {

			/* Skip items that are scrolled up */

			if (--pos >= 0) continue;

			int item_height = item->Height(width);

			if (y < item_height) {

				if (item->masked || !item->Selectable()) return false;

				value = item->result;

				return true;

			}

			y -= item_height;

		}

		return false;

	}

	void DrawWidget(const Rect &r, int widget) const override

	{

		if (widget != WID_DM_ITEMS) return;

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

		Rect ir = r.Shrink(WidgetDimensions::scaled.fullbevel).Shrink(RectPadding::zero, WidgetDimensions::scaled.fullbevel);

		int y = ir.top;

		int pos = this->vscroll->GetPosition();