/// <summary>
/// Process selection operation
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
// if mouse button is not pressed we have no drag operation, ...
if (e.LeftButton != MouseButtonState.Pressed)
{
this.dragStartPoint = null;
}
// but if mouse button is pressed and start point value is set we do have one
if (this.dragStartPoint.HasValue)
{
// create connection adorner
DesignerCanvas designer = DiagramHelper.GetDiagramDesigner(this);
if (designer != null)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(designer);
if (adornerLayer != null)
{
DiagramConnectorAdorner adorner = new DiagramConnectorAdorner(designer, this, this.dragStartPoint.Value);
if (adorner != null)
{
adornerLayer.Add(adorner);
e.Handled = true;
}
}
}
}
}
/// <summary>
/// Get start point of the possible selection operation.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
DesignerCanvas designer = DiagramHelper.GetDiagramDesigner(this);
if (designer != null)
{
// position relative to DesignerCanvas
this.dragStartPoint = new Point?(e.GetPosition(designer));
e.Handled = true;
}
}