public int ViewPointToItemIndex(Point viewPt)
{
if (!ViewRectangle.Contains(viewPt))
{
return(-1);
}
Size itemSize = ItemSize;
int index = viewPt.X / itemSize.Width;
return(index);
}
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
MouseDownButton = e.Button;
if (e.Button == MouseButtons.Left)
{
TempViewRectangle = ViewRectangle;
Capture = true;
MouseDownPoint = new Point(e.X, e.Y);
if (!ViewRectangle.Contains(e.X, e.Y))
{
int x = Math.Min(FullRectangle.X + FullRectangle.Width - ViewRectangle.Width,
Math.Max(FullRectangle.X, (e.X - ViewRectangle.Width / 2)));
int y = Math.Min(FullRectangle.Y + FullRectangle.Height - ViewRectangle.Height,
Math.Max(FullRectangle.Y, (e.Y - ViewRectangle.Height / 2)));
SetViewRectangle(new Rectangle(x, y, ViewRectangle.Width, ViewRectangle.Height));
}
MouseDownViewRectangle = ViewRectangle;
}
}
