/// <summary>
/// When a label is clicked, the corresponding PieDataPoint becomes selected.
/// This enables master-detail scenario driven by clicking on labels.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
Chart chart = TreeHelper.FindAncestor <Chart>(this);
if (chart != null)
{
PieSeries pieSeries = chart.Series.OfType <PieSeries>().FirstOrDefault();
if (pieSeries != null)
{
pieSeries.SelectedItem = this.Content;
}
}
}
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var currentElement = value as TextBlock;
if (currentElement != null)
{
var label = TreeHelper.FindAncestor <PieChartLabel>(currentElement);
if (label != null)
{
return(label.FormattedRatio);
}
}
return(null);
}
/// <summary>
/// If at least one arc is small, all labels are displayed connected by a line. Otherwise, they're positioned
/// in the arc midpoint.
/// </summary>
private void PositionAuto()
{
Chart chart = TreeHelper.FindAncestor <Chart>(this);
if (chart != null)
{
PieChartLabelArea labelArea = chart.Template.FindName("LabelArea_PART", chart) as PieChartLabelArea;
if (labelArea != null && labelArea.HasSmallArc)
{
this.PositionConnected();
}
else
{
this.PositionArcMidpoint();
}
}
}
private static void IsLabeledPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
bool isLabeled = (bool)e.NewValue;
if (isLabeled == true)
{
PieDataPoint pieDataPoint = obj as PieDataPoint;
if (pieDataPoint != null)
{
Chart chart = TreeHelper.FindAncestor <Chart>(pieDataPoint.Parent as DependencyObject);
if (chart != null)
{
Canvas labelArea = chart.Template.FindName("LabelArea_PART", chart) as Canvas;
if (labelArea != null)
{
AddLabel(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);
//};
}
