Function ScrollEditBoxTextRect

src/misc_gui.cpp:723–734

* Reposition edit text box rect based on textbuf length can caret position. * @param r Initial rect of edit text box. * @param tb The Textbuf being processed. * @return Updated rect. */

 * @return Updated rect.
 */
static Rect ScrollEditBoxTextRect(Rect r, const Textbuf &tb)
{
	const int linewidth = tb.pixels + GetCaretWidth();
	const int boxwidth = r.Width();
	if (linewidth <= boxwidth) return r;

	/* Extend to cover whole string. This is left-aligned, adjusted by caret position. */
	r = r.WithWidth(linewidth, false);

	/* Slide so that the caret is at the centre unless limited by bounds of the line, i.e. near either end. */
	return r.Translate(-std::clamp(tb.caretxoffs - (boxwidth / 2), 0, linewidth - boxwidth), 0);
}

void QueryString::DrawEditBox(const Window *w, WidgetID wid) const
{