/// <summary>
/// Delegate called when the control is initialized.
/// </summary>
/// <param name="pEventArgs">The event arguments.</param>
protected override void OnInitialized(EventArgs pEventArgs)
{
PortViewModel lPortViewModel = this.DataContext as PortViewModel;
if (lPortViewModel == null)
{
return;
}
PortContainer lParentContainer = this.FindVisualParent <PortContainer>();
if (lParentContainer == null)
{
return;
}
PortView lPortView = lParentContainer.GetContainerForViewModel(lPortViewModel);
if (lPortView != null)
{
AdornerLayeredCanvas lCanvas = this.FindVisualParent <AdornerLayeredCanvas>();
if (lCanvas != null)
{
// Creating the adorner layer.
AdornerLayer lLayer = lCanvas.AdornerLayer;
// Creating the adorner and propagating this control background.
this.mAdorner = new ConnectorAdorner(lPortView);
this.UpdateConnectorsBackground();
// Adding the adorner to the layer.
lLayer.Add(this.mAdorner);
}
}
}
/// <summary>
/// Arranges the port views by taking in account the computed size of the panel viewport.
/// </summary>
/// <param name="pFinalSize">The available size.</param>
/// <returns>The size used (here equals to the available size).</returns>
protected override Size ArrangeOverride(Size pFinalSize)
{
// (1) Calling this base method is the key for the width of each port view to be well computed !!!
base.ArrangeOverride(pFinalSize);
int lInputPortsIndex = 0;
int lOutputPortsIndex = 0;
if (this.InternalChildren.Count > 0)
{
// Using the ActualWidth computed by the base arrange (1) method to have the good column width.
double lInputPortsWidth = -1;
PortView[] lInputPorts = this.InternalChildren.Cast <PortView>().Where(pPort => pPort.Direction == PortDirection.Input).ToArray();
if (lInputPorts.Any())
{
lInputPortsWidth = Math.Round(lInputPorts.Max(pPort => pPort.ActualWidth) - this.LineWidth / 2.0);
}
double lOutputPortsWidth = -1;
PortView[] lOutputPorts = this.InternalChildren.Cast <PortView>().Where(pPort => pPort.Direction == PortDirection.Output).ToArray();
if (lOutputPorts.Any())
{
lOutputPortsWidth = Math.Round(lOutputPorts.Max(pPort => pPort.ActualWidth) - this.LineWidth / 2.0);
}
if (lInputPortsWidth == -1 && lOutputPortsWidth != -1)
{
lInputPortsWidth = lOutputPortsWidth;
}
if (lInputPortsWidth != -1 && lOutputPortsWidth == -1)
{
lOutputPortsWidth = lInputPortsWidth;
}
for (int i = 0, lCount = this.InternalChildren.Count; i < lCount; ++i)
{
PortView lPort = this.InternalChildren[i] as PortView;
if (lPort != null)
{
if (lPort.Direction == PortDirection.Input)
{
// Input ports are in the first column.
lPort.Arrange(new Rect(0.0, lInputPortsIndex * (lPort.DesiredSize.Height + this.LineWidth), lInputPortsWidth, lPort.DesiredSize.Height));
lInputPortsIndex++;
}
else
{
// Output ports are in the second column.
lPort.Arrange(new Rect(lInputPortsWidth + this.LineWidth, lOutputPortsIndex * (lPort.DesiredSize.Height + this.LineWidth), lOutputPortsWidth, lPort.DesiredSize.Height));
lOutputPortsIndex++;
}
}
}
}
return(pFinalSize);
}
/// <summary>
/// Innitializes a new instance of the <see cref="ConnectorsAdorner"/> class.
/// </summary>
/// <param name="pAdornedElement">The orned prot view.</param>
public ConnectorsAdorner(PortView pAdornedElement)
: base(pAdornedElement)
{
// Creating the connectors contained in the adorner.
this.mVisualChildren = new VisualCollection(this);
this.mVisualChildren.Add(new InputConnector(pAdornedElement));
this.mVisualChildren.Add(new OutputConnector(pAdornedElement));
// Ensuring the measure is well computed.
this.AdornedPortView.SizeChanged += new SizeChangedEventHandler(this.OnPortViewSizeChanged);
}
/// <summary>
/// Innitializes a new instance of the <see cref="ConnectorsAdorner"/> class.
/// </summary>
/// <param name="pAdornedElement">The orned prot view.</param>
public ConnectorsAdorner(PortView pAdornedElement)
: base(pAdornedElement)
{
// Creating the connectors contained in the adorner.
this.mVisualChildren = new VisualCollection(this);
this.mVisualChildren.Add(new InputConnector(pAdornedElement));
this.mVisualChildren.Add(new OutputConnector(pAdornedElement));
// Ensuring the measure is well computed.
this.AdornedPortView.SizeChanged += new SizeChangedEventHandler(this.OnPortViewSizeChanged);
}
/// <summary>
/// Prespares the container for the given item.
/// </summary>
/// <param name="pElement">The item container.</param>
/// <param name="pItem">The contained item.</param>
protected override void PrepareContainerForItemOverride(DependencyObject pElement, object pItem)
{
base.PrepareContainerForItemOverride(pElement, pItem);
PortView lContainer = pElement as PortView;
if (lContainer != null)
{
// Updating the background.
lContainer.Background = this.Background;
}
}
/// <summary>
/// Updates the items background brush by applying the background of this container.
/// </summary>
private void UpdateItemsBackground()
{
if (this.ItemsSource != null)
{
foreach (PortViewModel lItem in this.ItemsSource)
{
PortView lPortView = this.ItemContainerGenerator.ContainerFromItem(lItem) as PortView;
if (lPortView != null)
{
lPortView.Background = this.Background;
}
}
}
}
/// <summary>
/// Delegate called when the control is initialized.
/// </summary>
/// <param name="pEventArgs">The event arguments.</param>
protected override void OnInitialized(EventArgs pEventArgs)
{
// The adorned port view is given to the control by the DataContext property.
PortView lPortView = this.DataContext as PortView;
if (lPortView != null)
{
AdornerLayeredCanvas lCanvas = this.FindVisualParent <AdornerLayeredCanvas>();
if (lCanvas != null)
{
// Creating the adorner layer.
AdornerLayer lLayer = lCanvas.AdornerLayer;
// Creating the adorner and propagating this control background.
this.Adorner = new ConnectorsAdorner(lPortView);
this.UpdateConnectorsBackground();
// Adding the adorner to the layer.
lLayer.Add(this.Adorner);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="OutputConnector"/> class.
/// </summary>
/// <param name="pParentPort">The connector parent port.</param>
public OutputConnector(PortView pParentPort)
: base(pParentPort)
{
}
/// <summary>
/// Method called when the control content changed.
/// </summary>
/// <param name="pOldContent">The previous content.</param>
/// <param name="pNewContent">The new content.</param>
protected override void OnContentChanged(object pOldContent, object pNewContent)
{
// Calling ancestor methods.
base.OnContentChanged(pOldContent, pNewContent);
BindingOperations.ClearAllBindings(this);
// The content is the view model.
ConnectionViewModel lViewModel = pNewContent as ConnectionViewModel;
if (lViewModel == null)
{
// Unreferencing the connectors to avoid memory leaks.
this.OutputConnector.ConnectionsCount--;
this.InputConnector.ConnectionsCount--;
this.OutputConnector.PositionChanged -= this.OnConnectorPositionChanged;
this.InputConnector.PositionChanged -= this.OnConnectorPositionChanged;
this.OutputConnector = null;
this.InputConnector = null;
}
else
{
// Binding the Background property.
Binding lBackgroundBinding = new Binding("Brush");
lBackgroundBinding.Source = lViewModel;
lBackgroundBinding.Mode = BindingMode.OneWay;
this.SetBinding(Connection.BackgroundProperty, lBackgroundBinding);
// Filling the output and input connectors.
SimpleGraphView lParentCanvas = this.FindVisualParent <SimpleGraphView>();
if (lViewModel != null && lParentCanvas != null)
{
NodeView lOutputNode = lParentCanvas.GetContainerForViewModel <NodeViewModel, NodeView>(lViewModel.Output.ParentNode);
if (lOutputNode != null)
{
PortView lOutputPort = lOutputNode.GetContainerForPortViewModel(lViewModel.Output);
if (lOutputPort != null)
{
this.OutputConnector = lOutputPort.Connector as OutputConnector;
if (this.OutputConnector != null)
{
this.OutputConnector.PositionChanged += this.OnConnectorPositionChanged;
this.OutputConnector.ConnectionsCount++;
}
}
}
NodeView lInputNode = lParentCanvas.GetContainerForViewModel <NodeViewModel, NodeView>(lViewModel.Input.ParentNode);
if (lInputNode != null)
{
PortView lInputPort = lInputNode.GetContainerForPortViewModel(lViewModel.Input);
if (lInputPort != null)
{
this.InputConnector = lInputPort.Connector as InputConnector;
if (this.InputConnector != null)
{
this.InputConnector.PositionChanged += this.OnConnectorPositionChanged;
this.InputConnector.ConnectionsCount++;
}
}
}
}
}
this.UpdateRendering();
}
/// <summary>
/// Computes the size of the panel viewport.
/// </summary>
/// <param name="pAvailableSize">The initial available size.</param>
/// <returns>The viewport desired size.</returns>
protected override Size MeasureOverride(Size pAvailableSize)
{
Size lColumnSize = base.MeasureOverride(pAvailableSize);
Size lInputPortsSize = new Size();
Size lOutputPortsSize = new Size();
int lInputPortsIndex = 0;
int lOutputPortsIndex = 0;
int lInputPortsCount = this.InternalChildren.Cast <PortView>().Where(lPort => lPort.Direction == PortDirection.Input).Count();
int lOutputPortsCount = this.InternalChildren.Cast <PortView>().Where(lPort => lPort.Direction == PortDirection.Output).Count();
// Width is the column width.
lInputPortsSize.Width = lColumnSize.Width + this.LineWidth / 2.0;
lOutputPortsSize.Width = lColumnSize.Width + this.LineWidth / 2.0;
// Iterating threw the ports to compute the height.
for (int i = 0, lCount = this.InternalChildren.Count; i < lCount; ++i)
{
PortView lPort = this.InternalChildren[i] as PortView;
if (lPort != null)
{
lPort.Measure(pAvailableSize);
if (lPort.Direction == PortDirection.Input)
{
if (lInputPortsIndex == 0 || lInputPortsIndex == lInputPortsCount - 1)
{
lInputPortsSize.Height += lPort.DesiredSize.Height + this.LineWidth / 2.0;
}
else
{
lInputPortsSize.Height += lPort.DesiredSize.Height + this.LineWidth;
}
lInputPortsIndex++;
}
else
{
if (lOutputPortsIndex == 0 || lOutputPortsIndex == lOutputPortsCount - 1)
{
lOutputPortsSize.Height += lPort.DesiredSize.Height + this.LineWidth / 2.0;
}
else
{
lOutputPortsSize.Height += lPort.DesiredSize.Height + this.LineWidth;
}
lOutputPortsIndex++;
}
}
}
// Computing the size of the panel.
Size lAvailableSize = new Size
{
Height = Math.Max(lInputPortsSize.Height, lOutputPortsSize.Height),
Width = lInputPortsSize.Width + lOutputPortsSize.Width
};
// This is the minimum size the control must have.
return(lAvailableSize);
}
/// <summary>
/// Initializes a new instance of the <see cref="AConnector"/> class.
/// </summary>
/// <param name="pParentPort">The connector parent port.</param>
protected AConnector(PortView pParentPort)
{
this.ParentPort = pParentPort;
this.LayoutUpdated += this.OnLayoutUpdated;
}
