/// <summary>
/// Detect and show path when dragging
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void OnDragDelta_DetectPath(object sender, DragDeltaEventArgs e)
{
AdornerDataThumb <ModelItem, Connector> thumb = sender as AdornerDataThumb <ModelItem, Connector>;
Point currentPoint = thumb.Data.Position + new Vector(e.HorizontalChange, e.VerticalChange);
Connector target = HitTest(thumb, currentPoint);
ModelItem item = thumb.AdornedParent;
Canvas canvas = item.ContainerCanvas;
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} Dragging - connItem {1} ", System.DateTime.Now.Millisecond, drawingConn);
#endif
if (drawingConn == null)
{
// create new connection
drawingConn = new ConnectionItem();
// get current connection type
Window w = Window.GetWindow(canvas);
ConnectionType connType = (ConnectionType)(w.FindName("CurrentConnectionType") as ComboBox).SelectedIndex;
drawingConn.ContentObject.Type = connType.ToString();
drawingConn.ContentObject.Source = thumb.Data; // bind source here
Diagram diagram = Project.Current.Children.FindByCanvas(canvas);
diagram.Children.Add(drawingConn.ContentObject);
}
if ((drawingConn.ContentObject.Sink = target) != null)
{
drawingConn.UpdatePath();
}
else
{
drawingConn.UpdatePath(drawingConn.ContentObject.SinkPosition = currentPoint);
}
drawingConn.Draw();
e.Handled = true;
}
private AdornerDataThumb <ModelItem, Connector> GetConnectorThumb(Connector conn)
{
AdornerDataThumb <ModelItem, Connector> thumb = new AdornerDataThumb <ModelItem, Connector>(AdornedElement as ModelItem, conn);
thumb.Style = FindResource("ConnectorStyle_" + conn.Type.ToString()) as Style;
thumb.DragDelta += OnDragDelta_DetectPath;
thumb.DragCompleted += OnDragCompleted_Connect;
return(thumb);
}
/// <summary>
/// Do hit test, if the target is a thumb (another connector), then return it
/// </summary>
/// <param name="hitPoint"></param>
/// <returns></returns>
private static Connector HitTest(AdornerDataThumb <ModelItem, Connector> thumb, Point hitPoint)
{
ModelItem elem = thumb.AdornedParent; Canvas canvas = elem.ContainerCanvas; HitTestResult hitRes = VisualTreeHelper.HitTest(canvas, hitPoint); DependencyObject hitObj = null;
Model model = elem.ContentObject; ModelItem res = null;
if (hitRes != null)
{
hitObj = hitRes.VisualHit;
}
while (hitObj != null && hitObj != canvas && (res = hitObj as ModelItem) == null)
{
hitObj = VisualTreeHelper.GetParent(hitObj);
}
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} hitObj {1} ", System.DateTime.Now.Millisecond, hitObj.GetType());
#endif
// test fails
if (res == null || res == elem)
{
return(null);
}
// spilit the rectangle into four areas with two line: y=-h/w*x+h, y=h/w*x
double width = res.Size.Width, height = res.Size.Height;
Vector relativeVector = hitPoint - res.Position;
double y1 = relativeVector.X * height / width, y2 = -y1 + height;
ConnectorType type = ConnectorType.Center;
// now calculate which connector is that
if (relativeVector.Y < y1 && relativeVector.Y < y2)
{
type = ConnectorType.Top;
}
else if (relativeVector.Y > y1 && relativeVector.Y < y2)
{
type = ConnectorType.Left;
}
else if (relativeVector.Y > y1 && relativeVector.Y > y2)
{
type = ConnectorType.Bottom;
}
else if (relativeVector.Y < y1 && relativeVector.Y > y2)
{
type = ConnectorType.Right;
}
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} Connector.Type {1} width {2} height {3}", System.DateTime.Now.Millisecond, type.ToString(), width, height);
#endif
return(res.ContentObject.GetConnector(type));
}
/// <summary>
/// When drag is completed, i.e. mouse up
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void OnDragCompleted_Connect(object sender, DragCompletedEventArgs e)
{
AdornerDataThumb <ModelItem, Connector> thumb = sender as AdornerDataThumb <ModelItem, Connector>;
Point currentPoint = thumb.Data.Position + new Vector(e.HorizontalChange, e.VerticalChange);
Connector target = HitTest(thumb, currentPoint);
ModelItem item = thumb.AdornedParent;
Canvas canvas = item.ContainerCanvas;
#if DEBUG_ON
// test value
System.Console.WriteLine("{0} DragCompleted - connItem {1} ", System.DateTime.Now.Millisecond, drawingConn);
#endif
if (drawingConn != null)
{
// if target is empty, cancel the connection
if (drawingConn.ContentObject.Sink == null)
{
Diagram diagram = Project.Current.Children.FindByCanvas(canvas);
diagram.Children.Remove(drawingConn.ContentObject);
}
drawingConn = null;
}
e.Handled = true;
}