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
DiagramCanvas canvas = GetDiagramCanvas(this);
if (canvas != null)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(canvas);
if (adornerLayer != null)
{
ConnectionNodeAdorner adorner = new ConnectionNodeAdorner(canvas, this);
if (adorner != null)
{
adornerLayer.Add(adorner);
e.Handled = true;
}
}
}
}
}
protected override void OnMouseDown(System.Windows.Input.MouseButtonEventArgs e)
{
base.OnMouseDown(e);
// usual selection business
DiagramCanvas designer = VisualTreeHelper.GetParent(this) as DiagramCanvas;
if (designer != null)
{
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != ModifierKeys.None)
{
if (this.IsSelected)
{
designer.SelectionService.RemoveFromSelection(this);
}
else
{
designer.SelectionService.AddToSelection(this);
}
}
else if (!this.IsSelected)
{
designer.SelectionService.SelectItem(this);
}
Focus();
}
e.Handled = false;
}
public SelectionAdorner(DiagramCanvas DiagramCanvas, Point?dragStartPoint)
: base(DiagramCanvas)
{
this.DiagramCanvas = DiagramCanvas;
this.startPoint = dragStartPoint;
SelectionPen = new Pen(Brushes.LightSlateGray, 1);
SelectionPen.DashStyle = new DashStyle(new double[] { 2 }, 1);
}
public ConnectionNodeAdorner(DiagramCanvas designer, ConnectionNode sourceConnectionNode)
: base(designer)
{
this.DiagramCanvas = designer;
this.sourceConnectionNode = sourceConnectionNode;
drawingPen = new Pen(Brushes.LightSlateGray, 1);
drawingPen.LineJoin = PenLineJoin.Round;
this.Cursor = Cursors.Cross;
}
void System.Windows.Markup.IComponentConnector.Connect(int connectionId, object target)
{
switch (connectionId)
{
case 1:
this.DiagramDesigner = ((DiagramDesigner.DiagramCanvas)(target));
return;
}
this._contentLoaded = true;
}
// when the layout changes we update the position property
void ConnectionNode_LayoutUpdated(object sender, EventArgs e)
{
DiagramCanvas designer = GetDiagramCanvas(this);
if (designer != null)
{
//get centre position of this ConnectionNode relative to the DiagramCanvas
this.Position = this.TransformToAncestor(designer).Transform(new Point(this.Width / 2, this.Height / 2));
}
}
internal ConnectionNodeInfo GetInfo()
{
ConnectionNodeInfo info = new ConnectionNodeInfo();
info.DiagramElementLeft = DiagramCanvas.GetLeft(this.ParentDiagramElement);
info.DiagramElementTop = DiagramCanvas.GetTop(this.ParentDiagramElement);
info.DiagramElementSize = new Size(this.ParentDiagramElement.ActualWidth, this.ParentDiagramElement.ActualHeight);
info.Orientation = this.Orientation;
info.Position = this.Position;
return(info);
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
DiagramCanvas canvas = GetDiagramCanvas(this);
if (canvas != null)
{
// position relative to DiagramCanvas
this.dragStartPoint = new Point?(e.GetPosition(canvas));
e.Handled = true;
}
}
private void ShowAdorner()
{
// the ConnectionAdorner is created once for each Connection
if (this.connectionAdorner == null)
{
DiagramCanvas designer = VisualTreeHelper.GetParent(this) as DiagramCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
this.connectionAdorner = new ConnectionAdorner(designer, this);
adornerLayer.Add(this.connectionAdorner);
}
}
this.connectionAdorner.Visibility = Visibility.Visible;
}
public ConnectionAdorner(DiagramCanvas designer, Connection connection)
: base(designer)
{
this.DiagramCanvas = designer;
adornerCanvas = new Canvas();
this.visualChildren = new VisualCollection(this);
this.visualChildren.Add(adornerCanvas);
this.connection = connection;
this.connection.PropertyChanged += new PropertyChangedEventHandler(AnchorPositionChanged);
InitializeDragControls();
drawingPen = new Pen(Brushes.LightSlateGray, 1);
drawingPen.LineJoin = PenLineJoin.Round;
base.Unloaded += new RoutedEventHandler(ConnectionAdorner_Unloaded);
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
DragObject dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null && !String.IsNullOrEmpty(dragObject.Xaml))
{
DiagramElement newItem = null;
Object content = XamlReader.Load(XmlReader.Create(new StringReader(dragObject.Xaml)));
if (content != null)
{
newItem = new DiagramElement();
newItem.Content = content;
Point position = e.GetPosition(this);
if (dragObject.DesiredSize.HasValue)
{
Size desiredSize = dragObject.DesiredSize.Value;
newItem.Width = desiredSize.Width;
newItem.Height = desiredSize.Height;
DiagramCanvas.SetLeft(newItem, Math.Max(0, position.X - newItem.Width / 2));
DiagramCanvas.SetTop(newItem, Math.Max(0, position.Y - newItem.Height / 2));
}
else
{
DiagramCanvas.SetLeft(newItem, Math.Max(0, position.X));
DiagramCanvas.SetTop(newItem, Math.Max(0, position.Y));
}
Canvas.SetZIndex(newItem, this.Children.Count);
this.Children.Add(newItem);
SetConnectionNodeDecoratorTemplate(newItem);
//update selection
this.SelectionService.SelectItem(newItem);
newItem.Focus();
}
e.Handled = true;
}
}
void Connection_Unloaded(object sender, RoutedEventArgs e)
{
// do some housekeeping when Connection is unloaded
// remove event handler
this.Source = null;
this.Target = null;
// remove adorner
if (this.connectionAdorner != null)
{
DiagramCanvas designer = VisualTreeHelper.GetParent(this) as DiagramCanvas;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Remove(this.connectionAdorner);
this.connectionAdorner = null;
}
}
}
public Selection(DiagramCanvas canvas)
{
this.DiagramCanvas = canvas;
}
