/// <summary>
/// Removes the element from <see cref="XCaseCanvas"/>.
/// </summary>
public void DeleteFromCanvas()
{
AssociationName = null;
foreach (KeyValuePair <AssociationEnd, XCaseJunction> pair in associationJunctions)
{
pair.Value.DeleteFromCanvas();
}
if (simpleAssociationJunction != null)
{
simpleAssociationJunction.DeleteFromCanvas();
}
if (Diamond != null)
{
Diamond.DeleteFromCanvas();
}
this.CloseBindings();
Controller.Association.Ends.CollectionChanged -= AssociationEnds_CollectionChanged;
}
private void InitializeFromViewHelper()
{
if (ViewHelper.AssociationEndsViewHelpers.Count != Association.Ends.Count)
{
ViewHelper.CreateEndsViewHelpers(this.Association);
}
if (ViewHelper.ForceUseDiamond)
{
ViewHelper.UseDiamond = true;
}
ViewHelper.ForceUseDiamond = false;
participantElements = new Dictionary <AssociationEndViewHelper, IConnectable>();
foreach (AssociationEndViewHelper endViewHelper in ViewHelper.AssociationEndsViewHelpers)
{
if (!(XCaseCanvas.ElementRepresentations[endViewHelper.AssociationEnd.Class] is IConnectable))
{
throw new InvalidOperationException("One of the association ends is not visualized as IConnectable");
}
participantElements[endViewHelper]
= XCaseCanvas.ElementRepresentations[endViewHelper.AssociationEnd.Class] as IConnectable;
}
foreach (Control c in subControls)
{
if (c != null)
{
c.MouseEnter -= junction_MouseEnter;
c.MouseLeave -= junction_MouseLeave;
}
}
if (ViewHelper.UseDiamond)
{
// simpleAssociationJunction field won't be used if diamond is used
if (simpleAssociationJunction != null)
{
simpleAssociationJunction.DeleteFromCanvas();
ViewHelper.AssociationEndsViewHelpers[0].Points.Clear();
}
// prepare the diamond
if (Diamond == null)
{
Diamond = new AssociationDiamond(XCaseCanvas, this, ViewHelper);
XCaseCanvas.Children.Add(Diamond);
}
Rect r = RectExtensions.GetEncompassingRectangle(participantElements.Values);
if (ViewHelper.X == 0 && ViewHelper.Y == 0)
{
Diamond.X = r.GetCenter().X - Diamond.ActualWidth / 2;
Diamond.Y = r.GetCenter().Y - Diamond.ActualHeight / 2;
ViewHelper.X = Diamond.X;
ViewHelper.Y = Diamond.Y;
}
Diamond.UpdateLayout();
/*
* for each association end there will be one junction between the diamond and the
* participating element. Start point of the junction will lay on the diamond, end
* point of the junction will lay on the participating element and will be bound to
* an association end.
*/
foreach (AssociationEndViewHelper endViewHelper in ViewHelper.AssociationEndsViewHelpers)
{
//compute the start and end point of each junction if they are not already computed
if (endViewHelper.Points.Count < 2)
{
endViewHelper.Points.Clear();
endViewHelper.Points.AppendRange(JunctionGeometryHelper.ComputeOptimalConnection(Diamond, participantElements[endViewHelper]));
if (!Diamond.IsMeasureValid || !participantElements[endViewHelper].IsMeasureValid)
{
endViewHelper.Points.PointsInvalid = true;
}
}
XCaseJunction junction = new XCaseJunction(XCaseCanvas, this, endViewHelper.Points);
junction.NewConnection(Diamond, null, participantElements[endViewHelper], endViewHelper, endViewHelper.Points);
junction.StartPoint.Movable = false;
junction.StartPoint.Visibility = Visibility.Hidden;
associationJunctions[endViewHelper.AssociationEnd] = junction;
XCaseCanvas.Children.Add(junction);
}
}
else
{
foreach (XCaseJunction junction in associationJunctions.Values)
{
junction.DeleteFromCanvas();
}
if (Diamond != null)
{
Diamond.DeleteFromCanvas();
Diamond = null;
}
associationJunctions.Clear();
IConnectable SourceElement = (IConnectable)XCaseCanvas.ElementRepresentations[ViewHelper.AssociationEndsViewHelpers[0].AssociationEnd.Class];
IConnectable TargetElement;
if (ViewHelper.AssociationEndsViewHelpers.Count == 2 &&
ViewHelper.AssociationEndsViewHelpers[0].AssociationEnd.Class == ViewHelper.AssociationEndsViewHelpers[1].AssociationEnd.Class)
{
TargetElement = SourceElement;
if (ViewHelper.Points.Count == 0)
{
ViewHelper.Points.AppendRange(JunctionGeometryHelper.ComputePointsForSelfAssociation(SourceElement.GetBounds()));
if (!SourceElement.IsMeasureValid)
{
ViewHelper.Points.PointsInvalid = true;
}
}
}
/*
* two different classes are connected directly without using central diamond,
* association will consist of two points
* in optimal position to connect two rectangles.
*/
else if (ViewHelper.AssociationEndsViewHelpers.Count == 2)
{
TargetElement = (IConnectable)XCaseCanvas.ElementRepresentations[ViewHelper.AssociationEndsViewHelpers[1].AssociationEnd.Class];
if (ViewHelper.Points.Count < 2)
{
ViewHelper.Points.Clear();
ViewHelper.Points.AppendRange(JunctionGeometryHelper.ComputeOptimalConnection(SourceElement, TargetElement));
if (!SourceElement.IsMeasureValid)
{
ViewHelper.Points.PointsInvalid = true;
}
}
}
else
{
throw new InvalidOperationException("UseDiamond must be true if there are more association ends than 2");
}
/*
* diamond is not used, simpleAssociationJunction field will be used to
* represent the junction
*/
if (simpleAssociationJunction != null)
{
simpleAssociationJunction.DeleteFromCanvas();
}
simpleAssociationJunction = new XCaseJunction(XCaseCanvas, this, ViewHelper.Points);
if (Association.Ends.Count == 1)
{
simpleAssociationJunction.NewConnection(SourceElement, null, TargetElement, ViewHelper.AssociationEndsViewHelpers[0], ViewHelper.Points);
}
else
{
simpleAssociationJunction.NewConnection(SourceElement, ViewHelper.AssociationEndsViewHelpers[0], TargetElement, ViewHelper.AssociationEndsViewHelpers[1], ViewHelper.Points);
}
XCaseCanvas.Children.Add(simpleAssociationJunction);
}
foreach (Control c in subControls)
{
if (c != null)
{
c.MouseEnter += junction_MouseEnter;
c.MouseLeave += junction_MouseLeave;
}
}
}