Method GetScrolledRowFromWidget

src/widget.cpp:2453–2458

* Compute the row of a scrolled widget that a user clicked in. * @param clickpos Vertical position of the mouse click (without taking scrolling into account). * @param w The window the click was in. * @param widget Widget number of the widget clicked in. * @param padding Amount of empty space between the widget edge and the top of the first row. Default value is \c 0. *

 * @return Row number clicked at. If clicked at a wrong position, #Scrollbar::npos is returned.
 */
Scrollbar::size_type Scrollbar::GetScrolledRowFromWidget(int clickpos, const Window * const w, WidgetID widget, int padding, int line_height) const
{
	int pos = w->GetRowFromWidget(clickpos, widget, padding, line_height);
	if (pos != INT_MAX) pos += this->GetPosition();
	return (pos < 0 || pos >= this->GetCount()) ? Scrollbar::npos : pos;
}

/**
 * Update the given list position as if it were on this scroll bar when the given keycode was pressed.