/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TickDragScroll(object sender, EventArgs e)
{
bool isDone = true;
if (this.IsLoaded)
{
Rect bounds = new Rect(RenderSize);
Point p = MouseUtilities.GetMousePosition(this);
if (bounds.Contains(p))
{
int dir = 0;
if (p.X < DragMargin)
{
dir |= (int)DragDirection.Left;
isDone = false;
}
else if (p.X > RenderSize.Width - DragMargin)
{
dir |= (int)DragDirection.Right;
isDone = false;
}
if (p.Y < DragMargin)
{
dir |= (int)DragDirection.Up;
isDone = false;
}
else if (p.Y > RenderSize.Height - DragMargin)
{
dir |= (int)DragDirection.Down;
isDone = false;
}
if (dir != 0)
{
DragScroll(dir);
}
}
}
if (isDone)
{
CancelDrag();
}
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
public void DoMouseDown()
{
Point p = MouseUtilities.GetMousePosition(this);
if ((p.Y < DragMargin) || (p.Y > RenderSize.Height - DragMargin) ||
(p.X < DragMargin) || (p.X > RenderSize.Width - DragMargin))
{
if (_dragScrollTimer == null)
{
_dragVelocity = DragInitialVelocity;
_dragScrollTimer = new DispatcherTimer();
_dragScrollTimer.Tick += TickDragScroll;
_dragScrollTimer.Interval = new TimeSpan(0, 0, 0, 0, (int)DragInterval);
_dragScrollTimer.Start();
}
}
}