/// <summary>
/// Adds the labels to each of its PieDataPoints.
/// </summary>
protected override void OnAfterUpdateDataPoints()
{
LabeledPieChart chart = this.SeriesHost as LabeledPieChart;
if (chart != null)
{
Panel labelArea = TreeHelper.FindDescendent(chart, "LabelArea_PART") as Panel;
if (labelArea != null && this.ItemsSource != null)
{
foreach (object dataItem in this.ItemsSource)
{
PieDataPoint pieDataPoint = this.GetDataPoint(dataItem) as PieDataPoint;
if (pieDataPoint != null)
{
this.AddLabelPieDataPoint(pieDataPoint, labelArea);
}
}
}
}
}
/// <summary>
/// Creates a new PieChartLabel control and adds it to the "LabelArea_PART" canvas.
/// </summary>
/// <param name="pieDataPoint">PieDataPoint that corresponds to PieChartLabel.</param>
/// <param name="labelStyle">The style to be applied to the PieChartLabel.</param>
/// <param name="labelArea">The canvas where PieChartLabel will be added.</param>
private static void AddLabel(PieDataPoint pieDataPoint, Panel labelArea)
{
PieChartLabel label = new PieChartLabel();
Style pieChartLabelStyle;
DataTemplate pieChartLabelItemTemplate;
LabeledPieChart chart = TreeHelper.FindAncestor <LabeledPieChart>(pieDataPoint);
if (chart != null)
{
pieChartLabelStyle = chart.PieChartLabelStyle;
if (pieChartLabelStyle != null)
{
label.Style = pieChartLabelStyle;
}
pieChartLabelItemTemplate = chart.PieChartLabelItemTemplate;
if (pieChartLabelItemTemplate != null)
{
label.ContentTemplate = pieChartLabelItemTemplate;
}
}
Binding contentBinding = new Binding("DataContext")
{
Source = pieDataPoint
};
label.SetBinding(ContentControl.ContentProperty, contentBinding);
Binding dataContextBinding = new Binding("DataContext")
{
Source = pieDataPoint
};
label.SetBinding(ContentControl.DataContextProperty, contentBinding);
Binding formattedRatioBinding = new Binding("FormattedRatio")
{
Source = pieDataPoint
};
label.SetBinding(PieChartLabel.FormattedRatioProperty, formattedRatioBinding);
Binding visibilityBinding = new Binding("Ratio")
{
Source = pieDataPoint, Converter = new DoubleToVisibilityConverter()
};
label.SetBinding(PieChartLabel.VisibilityProperty, visibilityBinding);
Binding geometryBinding = new Binding("Geometry")
{
Source = pieDataPoint
};
label.SetBinding(PieChartLabel.GeometryProperty, geometryBinding);
Binding displayModeBinding = new Binding("LabelDisplayMode")
{
Source = chart
};
label.SetBinding(PieChartLabel.DisplayModeProperty, displayModeBinding);
labelArea.Children.Add(label);
pieDataPoint.Loaded += delegate
{
if (label.Parent == null)
{
labelArea.Children.Add(label);
}
};
pieDataPoint.LayoutUpdated += delegate
{
if (!pieDataPoint.IsInTree())
{
labelArea.Children.Remove(label);
}
};
//pieDataPoint.Unloaded += delegate
//{
// labelArea.Children.Remove(label);
//};
}
