public void ScrollPanel(ScrollEventType type, ScrollOrientation orientation, int sign)
{
if (sign != 0)
{
ScrollProperties scroll;
Func <Point, int, int, Point> func;
if (orientation == ScrollOrientation.VerticalScroll)
{
scroll = VerticalScroll;
func = (p, sgn, stp) => new Point(-p.X, -p.Y + stp * sgn);
}
else
{
scroll = HorizontalScroll;
func = (p, sgn, stp) => new Point(-p.X + stp * sgn, -p.Y);
}
var step = type.HasFlag(ScrollEventType.LargeIncrement) || type.HasFlag(ScrollEventType.LargeDecrement)
? scroll.LargeChange
: scroll.SmallChange;
var oldValue = scroll.Value;
AutoScrollPosition = func(AutoScrollPosition, sign, step);
OnScroll(new ScrollEventArgs(type, oldValue, scroll.Value, orientation));
}
}
/// <summary>TODO</summary>
private void ScrollPanelCommon(ScrollEventType type, int sign, ScrollProperties scroll)
{
if (sign == 0)
{
return;
}
Func <Point, int, Point> func = (p, step) => new Point(-p.X, -p.Y + step * sign);
AutoScrollPosition = func(AutoScrollPosition,
type.HasFlag(ScrollEventType.LargeDecrement) ? scroll.LargeChange : scroll.SmallChange);
}
/// <summary>TODO</summary>
public void ScrollPanel(ScrollEventType type, ScrollOrientation orientation, int sign)
{
if (sign != 0)
{
ScrollProperties scroll;
Func<Point, int, int, Point> func;
if (orientation == ScrollOrientation.VerticalScroll)
{
scroll = VerticalScroll;
func = (p, sgn, stp) => new Point(-p.X, -p.Y + stp * sgn);
}
else
{
scroll = HorizontalScroll;
func = (p, sgn, stp) => new Point(-p.X + stp * sgn, -p.Y);
}
var step = type.HasFlag(ScrollEventType.LargeIncrement) || type.HasFlag(ScrollEventType.LargeDecrement)
? scroll.LargeChange
: scroll.SmallChange;
var oldValue = scroll.Value;
AutoScrollPosition = func(AutoScrollPosition, sign, step);
OnScroll(new ScrollEventArgs(type, oldValue, scroll.Value, orientation));
}
}
private static int ScrollActionIndex(ScrollEventType type, ScrollOrientation orientation, int sign) => (type.HasFlag(ScrollEventType.SmallDecrement) ? 4 : 0) + ((orientation == ScrollOrientation.HorizontalScroll) ? 2 : 0) + ((sign == +1) ? 1 : 0);
