static inline void DrawLabel(const Rect &r, WidgetType type, bool clicked, StringID str)

{

	if (str == STR_NULL) return;

	if ((type & WWT_MASK) == WWT_TEXTBTN_2 && clicked) str++;

	Dimension d = GetStringBoundingBox(str);

	int offset = max(0, ((int)(r.bottom - r.top + 1) - (int)d.height) / 2); // Offset for rendering the text vertically centered

}

/**

 * Draw text.

 * @param r      Rectangle of the background.

 * @param colour Colour of the text.

 * @param scrollbar    Scrollbar size, offset, and capacity information.

 */

static inline void DrawVerticalScrollbar(const Rect &r, Colours colour, bool up_clicked, bool bar_dragged, bool down_clicked, const Scrollbar *scrollbar)

{

	/* draw up/down buttons */

	DrawFrameRect(r.left, r.top, r.right, r.top + 9, colour, (up_clicked) ? FR_LOWERED : FR_NONE);

	DrawFrameRect(r.left, r.bottom - 9, r.right, r.bottom, colour, (down_clicked) ? FR_LOWERED : FR_NONE);

	int c1 = _colour_gradient[colour & 0xF][3];

	int c2 = _colour_gradient[colour & 0xF][7];

	/* draw "shaded" background */

	GfxFillRect(r.left, r.top + 10, r.right, r.bottom - 10, c2);

 * @param str    Cross to draw (#STR_BLACK_CROSS or #STR_SILVER_CROSS).

 */

static inline void DrawCloseBox(const Rect &r, Colours colour, StringID str)

{

	assert(str == STR_BLACK_CROSS || str == STR_SILVER_CROSS); // black or silver cross

	DrawFrameRect(r.left, r.top, r.right, r.bottom, colour, FR_NONE);

}

/**

 * Draw a caption bar.

 * @param r      Rectangle of the bar.

 * @param colour Colour of the window.

	DrawFrameRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, colour, (owner == INVALID_OWNER) ? FR_LOWERED | FR_DARKENED : FR_LOWERED | FR_DARKENED | FR_BORDERONLY);

	if (owner != INVALID_OWNER) {

		GfxFillRect(r.left + 2, r.top + 2, r.right - 2, r.bottom - 2, _colour_gradient[_company_colours[owner]][4]);

	}

}

/**

 * 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.

 */

static inline void DrawButtonDropdown(const Rect &r, Colours colour, bool clicked_button, bool clicked_dropdown, StringID str)

{

	if (_dynlang.text_dir == TD_LTR) {

		DrawFrameRect(r.left, r.top, r.right - 12, r.bottom, colour, clicked_button ? FR_LOWERED : FR_NONE);

		DrawFrameRect(r.right - 11, r.top, r.right, r.bottom, colour, clicked_dropdown ? FR_LOWERED : FR_NONE);

		if (str != STR_NULL) DrawString(r.left + WD_DROPDOWNTEXT_LEFT + clicked_button, r.right - WD_DROPDOWNTEXT_RIGHT + clicked_button, r.top + WD_DROPDOWNTEXT_TOP + clicked_button, str, TC_BLACK);

	} else {

		DrawFrameRect(r.left + 12, r.top, r.right, r.bottom, colour, clicked_button ? FR_LOWERED : FR_NONE);

		DrawFrameRect(r.left, r.top, r.left + 11, r.bottom, colour, clicked_dropdown ? FR_LOWERED : FR_NONE);

		if (str != STR_NULL) DrawString(r.left + WD_DROPDOWNTEXT_RIGHT + clicked_button, r.right - WD_DROPDOWNTEXT_LEFT + clicked_button, r.top + WD_DROPDOWNTEXT_TOP + clicked_button, str, TC_BLACK);

	}

}

/**

 * Draw a dropdown #WWT_DROPDOWN widget.

	const NWidgetBase *nwid = this->GetWidget<NWidgetBase>(widget);

	int offset = this->IsWidgetLowered(widget) ? 1 : 0;

	int base = offset + nwid->pos_x + (_dynlang.text_dir == TD_LTR ? nwid->current_x - WD_SORTBUTTON_ARROW_WIDTH : 0);

	int top = nwid->pos_y;

}

/**

 * @defgroup NestedWidgets Hierarchical widgets

 * Hierarchical widgets, also known as nested widgets, are widgets stored in a tree. At the leafs of the tree are (mostly) the 'real' widgets