/// <summary>
/// Detects whether an item is being dragged over a legend item and
/// selects the owner series as the drop target.
/// </summary>
/// <param name="args">Information about the drag event.</param>
/// <returns>The drop target.</returns>
protected override DataPointSeries GetDropTarget(SW.DragEventArgs args)
{
DependencyObject originalSource = (DependencyObject)args.OriginalSource;
LegendItem legendItem = originalSource.GetVisualAncestorsAndSelf().OfType <LegendItem>().FirstOrDefault();
if (legendItem != null)
{
DataPointSeries dataPointSeries = legendItem.Owner as DataPointSeries;
if (dataPointSeries != null)
{
return(dataPointSeries);
}
}
DataPointSeries seriesAncestor = GetItemsControlAncestor(originalSource);
if (seriesAncestor != null)
{
return(seriesAncestor);
}
if (Chart != null)
{
return(Chart.Series.OfType <DataPointSeries>().LastOrDefault());
}
return(null);
}
/// <summary>
/// Initializes a new instance of the SeriesDefinition class.
/// </summary>
public SeriesDefinition()
{
_legendItem = new LegendItem { Owner = this };
_legendItem.SetBinding(LegendItem.ContentProperty, new Binding("ActualTitle") { Source = this });
_legendItem.SetBinding(LegendItem.StyleProperty, new Binding("ActualLegendItemStyle") { Source = this });
_legendItems.Add(_legendItem);
}
/// <summary>
/// Creates a legend item.
/// </summary>
/// <returns>A legend item for insertion in the legend items collection.
/// </returns>
protected virtual LegendItem CreateLegendItem()
{
LegendItem legendItem = new LegendItem();
legendItem.SetStyle(LegendItemStyle);
return(legendItem);
}
/// <summary>
/// Updates the indexes of all legend items when a change is made to the collection.
/// </summary>
private void UpdateLegendItemIndexes()
{
int index = 0;
foreach (DataPoint dataPoint in ActiveDataPoints)
{
LegendItem legendItem = _dataPointLegendItems[dataPoint];
legendItem.Content = dataPoint.IndependentValue ?? (index + 1);
index++;
}
}
/// <summary>
/// Removes data point's legend item when the data point is removed.
/// </summary>
/// <param name="dataPoint">The data point to remove.</param>
protected override void RemoveDataPoint(DataPoint dataPoint)
{
base.RemoveDataPoint(dataPoint);
if (dataPoint != null)
{
LegendItem legendItem = _dataPointLegendItems[dataPoint];
_dataPointLegendItems.Remove(dataPoint);
LegendItems.Remove(legendItem);
UpdateLegendItemIndexes();
}
}
/// <summary>
/// Initializes a new instance of the SeriesDefinition class.
/// </summary>
public SeriesDefinition()
{
_legendItem = new LegendItem {
Owner = this
};
_legendItem.SetBinding(LegendItem.ContentProperty, new Binding("ActualTitle")
{
Source = this
});
_legendItem.SetBinding(LegendItem.StyleProperty, new Binding("ActualLegendItemStyle")
{
Source = this
});
_legendItems.Add(_legendItem);
}
/// <summary>
/// Creates a legend item for each data point.
/// </summary>
/// <param name="dataPoint">The data point added.</param>
protected override void AddDataPoint(DataPoint dataPoint)
{
base.AddDataPoint(dataPoint);
var pieDataPoint = (PieDataPoint)dataPoint;
int index = ActiveDataPoints.IndexOf(dataPoint) + 1;
LegendItem legendItem = CreatePieLegendItem(dataPoint, index);
// Grab a style enumerator if we don't have one already.
if (_resourceDictionaryEnumerator == null)
{
_resourceDictionaryEnumerator = GetResourceDictionaryWithTargetType(this, typeof(PieDataPoint), true);
}
if (_resourceDictionaryEnumerator.MoveNext())
{
ResourceDictionary paletteResources =
#if SILVERLIGHT
_resourceDictionaryEnumerator.Current.ShallowCopy();
#else
_resourceDictionaryEnumerator.Current;
#endif
pieDataPoint.PaletteResources = paletteResources;
pieDataPoint.Resources.MergedDictionaries.Add(paletteResources);
}
else
{
pieDataPoint.PaletteResources = null;
}
pieDataPoint.ActualDataPointStyle = DataPointStyle ?? pieDataPoint.Resources[DataPointStyleName] as Style;
pieDataPoint.SetBinding(StyleProperty,
new Binding(PieDataPoint.ActualDataPointStyleName)
{
Source = pieDataPoint
});
pieDataPoint.ActualLegendItemStyle = LegendItemStyle ??
(pieDataPoint.Resources[LegendItemStyleName] as Style);
legendItem.SetBinding(StyleProperty, new Binding(ActualLegendItemStyleName)
{
Source = pieDataPoint
});
_dataPointLegendItems[dataPoint] = legendItem;
LegendItems.Add(legendItem);
UpdateLegendItemIndexes();
}
/// <summary>
/// Creates a legend item from a data point.
/// </summary>
/// <param name="dataPoint">The data point to use to create the legend item.</param>
/// <param name="index">The 1-based index of the Control.</param>
/// <returns>The series host legend item.</returns>
private LegendItem CreatePieLegendItem(DataPoint dataPoint, int index)
{
LegendItem legendItem = CreateLegendItem();
// Set the Content of the LegendItem
legendItem.Content = dataPoint.IndependentValue ?? index;
// Create a representative DataPoint for access to styled properties
DataPoint legendDataPoint = CreateDataPoint();
legendDataPoint.DataContext = dataPoint.DataContext;
if (null != PlotArea)
{
// Bounce into the visual tree to get default Style applied
PlotArea.Children.Add(legendDataPoint);
PlotArea.Children.Remove(legendDataPoint);
}
legendDataPoint.SetStyle(dataPoint.Style);
legendItem.DataContext = legendDataPoint;
return(legendItem);
}
/// <summary>
/// Creates a legend item from a data point.
/// </summary>
/// <param name="dataPoint">The data point to use to create the legend item.</param>
/// <param name="index">The 1-based index of the Control.</param>
/// <returns>The series host legend item.</returns>
protected virtual LegendItem CreatePieLegendItem(DataPoint dataPoint, int index)
{
LegendItem legendItem = CreateLegendItem(this);
// Set the Content of the LegendItem
legendItem.Content = dataPoint.IndependentValue ?? index;
// Create a representative DataPoint for access to styled properties
DataPoint legendDataPoint = CreateDataPoint();
legendDataPoint.DataContext = dataPoint.DataContext;
if (null != PlotArea)
{
// Bounce into the visual tree to get default Style applied
PlotArea.Children.Add(legendDataPoint);
PlotArea.Children.Remove(legendDataPoint);
}
legendDataPoint.SetBinding(DataPoint.StyleProperty, new Binding(PieDataPoint.ActualDataPointStyleName)
{
Source = dataPoint
});
legendItem.DataContext = legendDataPoint;
return(legendItem);
}
/// <summary>
/// Creates a legend item for each data point.
/// </summary>
/// <param name="dataPoint">The data point added.</param>
protected override void AddDataPoint(DataPoint dataPoint)
{
base.AddDataPoint(dataPoint);
int index = ActiveDataPoints.IndexOf(dataPoint) + 1;
// Grab a style enumerator if we don't have one already.
if (_styleEnumerator == null)
{
_styleEnumerator = this.GetStylesWithTargetType(typeof(PieDataPoint), true);
}
if (_styleEnumerator.MoveNext())
{
Style style = _styleEnumerator.Current;
dataPoint.SetStyle(style);
}
LegendItem legendItem = CreatePieLegendItem(dataPoint, index);
_dataPointLegendItems[dataPoint] = legendItem;
LegendItems.Add(legendItem);
UpdateLegendItemIndexes();
}
/// <summary>
/// Creates a legend item.
/// </summary>
/// <returns>A legend item for insertion in the legend items collection.
/// </returns>
protected virtual LegendItem CreateLegendItem()
{
LegendItem legendItem = new LegendItem();
legendItem.SetStyle(LegendItemStyle);
return legendItem;
}
/// <summary>
/// Initializes a new instance of the FunctionSeries class.
/// </summary>
public FunctionSeries()
{
LegendItem = new LegendItem();
LegendItems.Add(LegendItem);
Clip = ClipGeometry = new RectangleGeometry();
SizeChanged += OnSizeChanged;
// Explicitly load the default template since the samples project
// is an application and does not have a generic.xaml file.
Template = XamlReader.Load(DefaultTemplate) as ControlTemplate;
LineBrush = new SolidColorBrush(Colors.Purple);
}
/// <summary>
/// Creates a legend item.
/// </summary>
/// <returns>A legend item for insertion in the legend items collection.
/// </returns>
/// <param name="owner">The owner of the new LegendItem.</param>
protected virtual LegendItem CreateLegendItem(DataPointSeries owner)
{
LegendItem legendItem = new LegendItem() { Owner = owner };
legendItem.SetBinding(LegendItem.StyleProperty, new Binding(ActualLegendItemStyleName) { Source = this });
legendItem.SetBinding(LegendItem.ContentProperty, new Binding(TitleName) { Source = this });
return legendItem;
}
