protected virtual void ClearDnDState()
{
_isStarted = false;
_dragStartPoint = Point.Empty;
_dragStartRect = Rectangle.Empty;
_dragStartMouseEventArgs = null;
}
// ------------------------------
// protected
// ------------------------------
protected virtual void OnMouseDown(MouseEventArgs e)
{
_dragStartPoint = e.Location;
_dragStartRect = new Rectangle(
new Point(e.X - _dragSize.Width / 2, e.Y - _dragSize.Height / 2),
_dragSize
);
_dragStartMouseEventArgs = new CancelMouseEventArgs(e);
if (_isStarted && e.Button == MouseButtons.Right)
{
CancelDrag();
}
ProcessClickCount(e);
if (e.Clicks != _clickCount)
{
e = new MouseEventArgs(e.Button, _clickCount, e.X, e.Y, e.Delta);
}
var handler = MouseDown;
if (handler != null)
{
handler(_eventSender, e);
}
}