protected virtual RectangleF GetScrollThumbRectangle()
{
int areaLength = GeometryHelper.GetDimension(ClientRectangle, Orientation) - 2 * GeometryHelper.GetDimension(ButtonSize, Orientation);
float thumbLength = areaLength * areaLength / (float)ScrollDistance;
float offset = ScrollValue / (float)ScrollDistance * (areaLength - thumbLength) + GeometryHelper.GetDimension(ButtonSize, Orientation);
switch (Orientation)
{
case Orientation.Horizontal:
return(new RectangleF(
ClientRectangle.Left + offset,
ClientRectangle.Top,
thumbLength,
Thickness
));
case Orientation.Vertical:
return(new RectangleF(
ClientRectangle.Left,
ClientRectangle.Top + offset,
Thickness,
thumbLength
));
}
throw new NotSupportedException();
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (isDragging)
{
int pixelDistance = GeometryHelper.GetDimension(e.Location, Orientation) - GeometryHelper.GetDimension(lastDraggingPoint, Orientation);
int areaLength = GeometryHelper.GetDimension(ClientSize, Orientation) - 2 * GeometryHelper.GetDimension(ButtonSize, Orientation);
int scrollDelta = (int)(pixelDistance / (float)areaLength * ScrollDistance);
ScrollValue = Math.Min(Math.Max(ScrollValue + scrollDelta, MinimumValue), MaximumValue);
lastDraggingPoint = e.Location;
}
base.OnMouseMove(e);
}