/// <summary>
/// Initializes a new instance of the <see cref="ConnectionCreationBehavior"/> class.
/// </summary>
/// <param name="pParent">The behavior parent view.</param>
/// <param name="pWorkingCanvas">The canvas containing the connection line to work with.</param>
public ConnectionCreationBehavior(SimpleGraphView pParent, Canvas pWorkingCanvas)
: base(pParent)
{
this.WorkingCanvas = pWorkingCanvas;
this.WorkingCanvas.Visibility = Visibility.Collapsed;
this.ConnectingLine.Visibility = Visibility.Collapsed;
this.mSourceConnector = null;
this.mTargetConnector = null;
}
/// <summary>
/// Initializes a new instance of the <see cref="ConnectingLineAdorner"/> class.
/// </summary>
/// <param name="pElement">The parent element.</param>
/// <param name="pSourceConnector">The source connector.</param>
public ConnectingLineAdorner(UIElement pElement, OutputConnector pSourceConnector)
: base(pElement)
{
this.Cursor = Cursors.Cross;
this.mSourceConnector = pSourceConnector;
// Creating the line contained in the adorner.
this.mVisualChildren = new VisualCollection(this);
this.mVisualChildren.Add(new ConnectingLine() { From = pSourceConnector.Position });
}
/// <summary>
/// Initializes a new instance of the <see cref="ConnectingLineAdorner"/> class.
/// </summary>
/// <param name="pElement">The parent element.</param>
/// <param name="pSourceConnector">The source connector.</param>
public ConnectingLineAdorner(UIElement pElement, OutputConnector pSourceConnector)
: base(pElement)
{
this.Cursor = Cursors.Cross;
this.mSourceConnector = pSourceConnector;
// Creating the line contained in the adorner.
this.mVisualChildren = new VisualCollection(this);
this.mVisualChildren.Add(new ConnectingLine()
{
From = pSourceConnector.Position
});
}
/// <summary>
/// Starts the connection creation process from the given source connector.
/// </summary>
/// <param name="pSource">The source connector.</param>
public void StartCreation(OutputConnector pSource)
{
// Updating the source.
this.mSourceConnector = pSource;
// Making the working canvas visible and updating the line position.
this.ConnectingLine.From = this.mSourceConnector.Position;
this.ConnectingLine.To = this.mSourceConnector.Position;
this.WorkingCanvas.Visibility = Visibility.Visible;
this.ConnectingLine.Visibility = Visibility.Visible;
// Listening to the mouse move and up of the canvas to update the line.
this.WorkingCanvas.CaptureMouse();
this.WorkingCanvas.MouseMove -= this.OnWorkingCanvasMouseMove;
this.WorkingCanvas.MouseMove += this.OnWorkingCanvasMouseMove;
this.WorkingCanvas.MouseUp -= this.OnWorkingCanvasMouseUp;
this.WorkingCanvas.MouseUp += this.OnWorkingCanvasMouseUp;
}
/// <summary>
/// Delegate called when the mouse isup on the working canvas.
/// </summary>
/// <param name="pSender">The event sender.</param>
/// <param name="pEventArgs">The event arguments.</param>
private void OnWorkingCanvasMouseUp(object pSender, MouseButtonEventArgs pEventArgs)
{
// Release the mouse capture.
this.WorkingCanvas.ReleaseMouseCapture();
this.WorkingCanvas.MouseMove -= this.OnWorkingCanvasMouseMove;
this.WorkingCanvas.MouseUp -= this.OnWorkingCanvasMouseUp;
this.WorkingCanvas.Visibility = Visibility.Collapsed;
this.ConnectingLine.Visibility = Visibility.Collapsed;
// Trying to create the final connection.
if (this.mSourceConnector != null && this.mTargetConnector != null)
{
// Both defined means the connection can be created. Test have been made in the mouse move event handler.
GraphViewModel lGraphViewModel = this.ParentView.DataContext as GraphViewModel;
if (lGraphViewModel == null)
{
return;
}
PortViewModel lSourceViewModel = this.mSourceConnector.ParentPort.Content as PortViewModel;
PortViewModel lTargetViewModel = this.mTargetConnector.ParentPort.Content as PortViewModel;
ConnectionViewModel lConnectionViewModel = new ConnectionViewModel();
lConnectionViewModel.Output = lSourceViewModel;
lConnectionViewModel.Input = lTargetViewModel;
lGraphViewModel.AddConnection(lConnectionViewModel);
}
// Forget the reference on connectors.
this.mSourceConnector = null;
this.mTargetConnector = null;
}
