public EdgeViewModel(ClassBoxViewModel souce, ClassBoxViewModel sink)
{
edge = new Edge();
sink.connectedEdges.Add(this);
souce.connectedEdges.Add(this);
Sink = sink.classBox;
Source = souce.classBox;
}
// There are two reasons for doing a 'MouseUp'.
// Either a Line is being drawn, and the second Shape has just been chosen
// or a Shape is being moved and the move is now done.
// This uses 'var' which is an implicit type variable (https://msdn.microsoft.com/en-us/library/bb383973.aspx).
private void MouseUpShape(MouseButtonEventArgs e)
{
// Used for adding a Line.
if (isAddingLine)
{
// Get source
if (addingLineFrom != null)
{
undoRedoController.AddAndExecute(new AddEdgeCommand(Lines, new EdgeViewModel(addingLineFrom, TargetShape(e))));
addingLineFrom = null;
isAddingLine = false;
}
else
{
addingLineFrom = TargetShape(e);
}
}
else
{
// The Shape is gotten from the mouse event.
var shape = TargetShape(e);
// The mouse position relative to the target of the mouse event.
var mousePosition = RelativeMousePosition(e);
// The Shape is moved back to its original position, so the offset given to the move command works.
shape.X = initialShapePosition.X;
shape.Y = initialShapePosition.Y;
// Now that the Move Shape operation is over, the Shape is moved to the final position,
// by using a MoveNodeCommand to move it.
// The MoveNodeCommand is given the offset that it should be moved relative to its original position,
// and with respect to the Undo/Redo functionality the Shape has only been moved once, with this Command.
undoRedoController.AddAndExecute(new MoveShapeCommand(shape, mousePosition.X - initialMousePosition.X, mousePosition.Y - initialMousePosition.Y));
// The mouse is released, as the move operation is done, so it can be used by other controls.
e.MouseDevice.Target.ReleaseMouseCapture();
}
}
