Function ScrollRect

src/widget.cpp:2544–2564

* Apply 'scroll' to a rect to be drawn in. * @param r Rect to be 'scrolled'. * @param sb The scrollbar affecting the scroll. * @param resize_step Resize step of the widget/scrollbar (1 if the scrollbar is pixel-based.) * @returns Scrolled rect. */

 * @returns Scrolled rect.
 */
Rect ScrollRect(Rect r, const Scrollbar &sb, int resize_step)
{
	const int count = sb.GetCount() * resize_step;
	const int position = sb.GetPosition() * resize_step;

	if (sb.IsVertical()) {
		r.top -= position;
		r.bottom = r.top + count;
	} else {
		bool rtl = _current_text_dir == TD_RTL;
		if (rtl) {
			r.right += position;
			r.left = r.right - count;
		} else {
			r.left -= position;
			r.right = r.left + count;
		}
	}

	return r;
}

/**
 * Scrollbar widget.