/// <summary>
/// Updates the labels of a given owner.
/// </summary>
/// <param name="graph">The graph the owner belongs to.</param>
/// <param name="labelDefaults">The defaults to create the labels with.</param>
/// <param name="item">The owner of the label.</param>
/// <param name="labelData">The data to create the labels from.</param>
private static void UpdateLabels(IGraph graph, ILabelDefaults labelDefaults, ILabelOwner item, object labelData)
{
var labels = item.Labels;
if (labelData == null)
{
while (labels.Count > 0)
{
graph.Remove(labels[labels.Count - 1]);
}
}
else if (labels.Count == 0)
{
var layoutParameter = labelDefaults.GetLayoutParameterInstance(item);
var labelStyle = labelDefaults.GetStyleInstance(item);
graph.AddLabel(item, labelData.ToString(), layoutParameter, labelStyle, null, labelData);
}
else if (labels.Count > 0)
{
var label = labels[0];
if (label.Text != labelData.ToString())
{
graph.SetLabelText(label, labelData.ToString());
}
if (label.Tag != labelData)
{
label.Tag = labelData;
}
}
}
/// <summary>
/// Copy one edge label.
/// </summary>
/// <param name="pageView">The view (i.e. target) graph.</param>
/// <param name="edgeLabelLayout">The layout of the label.</param>
/// <param name="modelLabel">The original label.</param>
/// <param name="viewEdge">The copied edge (from the view graph).</param>
/// <param name="labelDefaults"></param>
/// <returns>The copied label.</returns>
private ILabel CopyEdgeLabel(IGraph pageView, IEdgeLabelLayout edgeLabelLayout, ILabel modelLabel, IEdge viewEdge, ILabelDefaults labelDefaults)
{
// get the style from edgeLabelStyle property. If none is set get it from the original (model) label.
ILabelStyle style = (ILabelStyle)(labelDefaults.Style != NullLabelStyle ?
labelDefaults.GetStyleInstance(viewEdge) :
modelLabel.Style.Clone());
ILabelModelParameter parameter = labelDefaults.LayoutParameter != NullLabelModelParameter
? labelDefaults.GetLayoutParameterInstance(viewEdge)
: (ILabelModelParameter)edgeLabelLayout.ModelParameter;
// create a new label in the view graph using the style,
// the text from the original label and the layout from the layout graph
ILabel viewLabel = pageView.AddLabel(viewEdge, modelLabel.Text, parameter, style);
viewLabel.Tag = modelLabel.Tag;
return(viewLabel);
}
/// <summary>
/// Copy all labels of the given edge.
/// </summary>
private void CopyEdgeLabels(LayoutGraph pageLayoutGraph, IGraph pageView, Edge layoutEdge, IEdge copiedEdge, IEdge modelEdge, ILabelDefaults labelDefaults)
{
IEdgeLabelLayout[] edgeLabels = pageLayoutGraph.GetLabelLayout(layoutEdge);
for (int i = 0; i < edgeLabels.Length; i++)
{
// get the label layout from the layout graph
IEdgeLabelLayout edgeLabelLayout = edgeLabels[i];
// get the original label from the model graph
ILabel edgeModelLabel = modelEdge.Labels[i];
CopyEdgeLabel(pageView, edgeLabelLayout, edgeModelLabel, copiedEdge, labelDefaults);
}
}
