/// <summary>
/// Changes the <see cref="TargetElement"/> from current target element to
/// <paramref name="targetElement"/>
/// </summary>
/// <param name="targetElement">new target element.</param>
internal void ReconnectTargetElement(IConnectable targetElement)
{
if (targetElement == TargetElement)
{
return;
}
if (Points.Count < 2 /*|| EndPoint.Parent == null*/)
{
return;
}
if (TargetElement != null)
{
TargetElement.SizeChanged -= TargetElement_SizeChanged;
((IConnectable)TargetElement).UnHighlight();
TargetElement = null;
}
Points.RemoveAt(Points.Count - 1);
TargetElement = (Control)targetElement;
((IConnectable)TargetElement).Highlight();
JunctionPoint endPoint = targetElement.CreateJunctionEnd();
endPoint.Junction = this;
endPoint.OrderInJunction = 1;
endPoint.ContextMenu = null;
Points.Add(endPoint);
//TargetElement.SizeChanged += TargetElement_SizeChanged;
Cursor = Cursors.Hand;
InvalidateGeometry();
}
/// <summary>
/// Draws junction between <paramref name="c1"/> and <paramref name="endPoint"/>. This method is supposed
/// to be used when connection is dragged between two elements (one of them is <paramref name="c1"/>)
/// and <paramref name="endPoint"/> is being dragged "on the way" to the second element.
/// </summary>
/// <param name="c1">connected element</param>
/// <param name="endPoint">dragged point</param>
/// <param name="canvas">canvas where the junction is created</param>
internal void DragConnection(IConnectable c1, JunctionPoint endPoint, XCaseCanvas canvas)
{
SourceElement = c1 as Control;
JunctionPoint startPoint = c1.CreateJunctionEnd();
startPoint.Junction = this;
startPoint.OrderInJunction = 0;
endPoint.Junction = this;
endPoint.OrderInJunction = 1;
Points.Add(startPoint);
Points.Add(endPoint);
TargetElement = null;
}
/// <summary>
/// News the connection.
/// </summary>
/// <param name="sourceElement">source element</param>
/// <param name="sourceViewHelper">view helper for the association end that is related to <paramref name="sourceElement"/>,
/// can be set to null if <paramref name="sourceElement"/> has not an association end for this connection.</param>
/// <param name="targetElement">target element</param>
/// <param name="targetViewHelper">view helper for the association end that is related to <paramref name="targetElement"/>,
/// can be set to null if <paramref name="targetElement"/> has not an association end for this connection.</param>
/// <param name="points">collection of points for the junction (usually part of some ViewHelper), the junction reflects
/// all changes in the collection</param>
public void NewConnection(
IConnectable sourceElement,
AssociationEndViewHelper sourceViewHelper,
IConnectable targetElement,
AssociationEndViewHelper targetViewHelper,
ObservablePointCollection points)
{
foreach (JunctionPoint point in Points)
{
point.DeleteFromCanvas();
}
Points.Clear();
if (points == null)
{
throw new ArgumentNullException("points");
}
if (points.Count < 2)
{
throw new ArgumentException("There must be at last two points to set a connection.", "points");
}
SourceElement = (Control)sourceElement;
TargetElement = (Control)targetElement;
JunctionPoint startPoint;
if (sourceViewHelper != null)
{
startPoint = ((ICreatesAssociationEnd)sourceElement).CreateAssociationEnd(points.First(), sourceViewHelper, sourceViewHelper.AssociationEnd);
((PIM_AssociationEnd)startPoint).Association = Association;
}
else
{
startPoint = (sourceElement).CreateJunctionEnd(points.First());
}
startPoint.ContextMenu = null;
startPoint.Junction = this;
startPoint.OrderInJunction = 0;
Points.Add(startPoint);
JunctionPoint endPoint;
if (targetViewHelper != null)
{
endPoint = ((ICreatesAssociationEnd)targetElement).CreateAssociationEnd(points.Last(), targetViewHelper, targetViewHelper.AssociationEnd);
((PIM_AssociationEnd)endPoint).Association = Association;
}
else
{
endPoint = targetElement.CreateJunctionEnd(points.Last());
}
endPoint.ContextMenu = null;
endPoint.Junction = this;
endPoint.OrderInJunction = 1;
Points.Add(endPoint);
if (startPoint is PIM_AssociationEnd)
{
((PIM_AssociationEnd)startPoint).StartBindings();
}
if (endPoint is PIM_AssociationEnd)
{
((PIM_AssociationEnd)endPoint).StartBindings();
}
int zindex = Math.Min(Panel.GetZIndex(SourceElement), Panel.GetZIndex(TargetElement));
zindex--;
Canvas.SetZIndex(this, zindex - 1);
UpdateLayout();
for (int i = 1; i < points.Count - 1; i++)
{
Point point = points[i];
BreakLine(point, i);
}
SourceElement.SizeChanged += SourceElement_SizeChanged;
TargetElement.SizeChanged += TargetElement_SizeChanged;
AutoPosModeOnly = AutoPosModeOnly;
InvalidateGeometry();
}