/// <summary>
/// Adds a mapper with a <see cref="PreferredPlacementDescriptor"/> that matches the given settings to the mapper
/// registry of the given graph. In addition, sets the label model of all edge labels to free since that model
/// can realizes any label placement calculated by a layout algorithm.
/// </summary>
public LayoutData CreateLabelingLayoutData(
IGraph graph, EnumLabelPlacementAlongEdge placeAlongEdge, EnumLabelPlacementSideOfEdge sideOfEdge,
EnumLabelPlacementOrientation orientation, double distanceToEdge)
{
var descriptor = CreatePreferredPlacementDescriptor(
placeAlongEdge,
sideOfEdge,
orientation,
distanceToEdge
);
// change to a free edge label model to support integrated edge labeling
var model = new FreeEdgeLabelModel();
foreach (var label in graph.GetEdgeLabels())
{
if (!(label.LayoutParameter.Model is FreeEdgeLabelModel))
{
graph.SetLabelLayoutParameter(label, model.FindBestParameter(label, model, label.GetLayout()));
}
}
var layoutData = new GenericLayoutData();
layoutData.AddItemMapping(LayoutGraphAdapter.EdgeLabelLayoutPreferredPlacementDescriptorDpKey,
new ItemMapping <ILabel, PreferredPlacementDescriptor>(label => descriptor));
return(layoutData);
}
private static void AddNodeHalos(GenericLayoutData data, IGraph graph, ISelectionModel <IModelItem> selection, bool layoutOnlySelection)
{
var nodeHalos = new DictionaryMapper <INode, NodeHalo>();
foreach (var node in graph.Nodes)
{
var top = 0.0;
var left = 0.0;
var bottom = 0.0;
var right = 0.0;
// for each port with an EventPortStyle extend the node halo to cover the ports render size
foreach (var port in node.Ports)
{
var eventPortStyle = port.Style as EventPortStyle;
if (eventPortStyle != null)
{
var renderSize = eventPortStyle.RenderSize;
var location = port.GetLocation();
top = Math.Max(top, node.Layout.Y - location.Y - renderSize.Height / 2);
left = Math.Max(left, node.Layout.X - location.X - renderSize.Width / 2);
bottom = Math.Max(bottom, location.Y + renderSize.Height / 2 - node.Layout.GetMaxY());
right = Math.Max(right, location.X + renderSize.Width / 2 - node.Layout.GetMaxX());
}
}
// for each node without incoming or outgoing edges reserve space for laid out exterior labels
if (graph.InDegree(node) == 0 || graph.OutDegree(node) == 0)
{
foreach (var label in node.Labels)
{
if (IsNodeLabelAffected(graph, selection, label, layoutOnlySelection))
{
var labelBounds = label.GetLayout().GetBounds();
if (graph.InDegree(node) == 0)
{
left = Math.Max(left, labelBounds.Width);
top = Math.Max(top, labelBounds.Height);
}
if (graph.OutDegree(node) == 0)
{
right = Math.Max(right, labelBounds.Width);
bottom = Math.Max(bottom, labelBounds.Height);
}
}
}
}
nodeHalos[node] = NodeHalo.Create(top, left, bottom, right);
}
data.AddItemMapping(NodeHalo.NodeHaloDpKey).Mapper = nodeHalos;
}
private static void AddEdgeLabelPlacementDescriptors(GenericLayoutData data)
{
var atSourceDescriptor = new PreferredPlacementDescriptor {
PlaceAlongEdge = LabelPlacements.AtSourcePort,
SideOfEdge = LabelPlacements.LeftOfEdge | LabelPlacements.RightOfEdge,
};
data.AddItemMapping(LayoutGraphAdapter.EdgeLabelLayoutPreferredPlacementDescriptorDpKey).Delegate =
label => {
var edgeType = ((BpmnEdgeStyle)((IEdge)label.Owner).Style).Type;
if (edgeType == EdgeType.SequenceFlow || edgeType == EdgeType.DefaultFlow || edgeType == EdgeType.ConditionalFlow)
{
// labels on sequence, default and conditional flow edges should be placed at the source side.
return(atSourceDescriptor);
}
return(null);
};
}
private static void MarkFixedAndAffectedItems(GenericLayoutData data, HierarchicLayoutData hierarchicLayoutData, ISelectionModel <IModelItem> graphSelection,
bool layoutOnlySelection)
{
if (layoutOnlySelection)
{
var affectedEdges = Mappers.FromDelegate((IEdge edge) =>
graphSelection.IsSelected(edge) ||
graphSelection.IsSelected(edge.GetSourceNode()) ||
graphSelection.IsSelected(edge.GetTargetNode()));
data.AddItemCollection(LayoutKeys.AffectedEdgesDpKey).Mapper = affectedEdges;
// fix ports of unselected edges and edges at event ports
data.AddItemMapping(PortConstraintKeys.SourcePortConstraintDpKey).Delegate =
edge =>
(!affectedEdges[edge] || edge.SourcePort.Style is EventPortStyle)
? PortConstraint.Create(GetSide(edge, true))
: null;
data.AddItemMapping(PortConstraintKeys.TargetPortConstraintDpKey).Delegate =
edge => !affectedEdges[edge] ? PortConstraint.Create(GetSide(edge, false)) : null;
// give core layout hints that selected nodes and edges should be incremental
hierarchicLayoutData.IncrementalHints.ContextDelegate = (item, factory) => {
if (item is INode && graphSelection.IsSelected(item))
{
return(factory.CreateLayerIncrementallyHint(item));
}
else if (item is IEdge && affectedEdges[(IEdge)item])
{
return(factory.CreateSequenceIncrementallyHint(item));
}
return(null);
};
data.AddItemCollection(BpmnLayout.AffectedLabelsDpKey).Delegate = label => {
var edge = label.Owner as IEdge;
if (edge != null)
{
return(affectedEdges[edge]);
}
var node = label.Owner as INode;
if (node != null)
{
var isInnerLabel = node.Layout.Contains(label.GetLayout().GetCenter());
bool isPool = node.Style is PoolNodeStyle;
bool isChoreography = node.Style is ChoreographyNodeStyle;
return(!isInnerLabel && !isPool && !isChoreography && graphSelection.IsSelected(node));
}
return(false);
};
}
else
{
// fix source port of edges at event ports
data.AddItemMapping(PortConstraintKeys.SourcePortConstraintDpKey).Delegate =
edge => edge.SourcePort.Style is EventPortStyle?PortConstraint.Create(GetSide(edge, true)) : null;
data.AddItemCollection(BpmnLayout.AffectedLabelsDpKey).Delegate = label => {
if (label.Owner is IEdge)
{
return(true);
}
var node = label.Owner as INode;
if (node != null)
{
var isInnerLabel = node.Layout.Contains(label.GetLayout().GetCenter());
bool isPool = node.Style is PoolNodeStyle;
bool isChoreography = node.Style is ChoreographyNodeStyle;
return(!isInnerLabel && !isPool && !isChoreography);
}
return(false);
};
}
}