internal override void ArrangeLabel(FrameworkElement visual, ChartSeriesLabelUpdateContext context)
{
RadSize size = MeasureVisual(visual);
PieDataPoint piePoint = context.Point as PieDataPoint;
double radius = this.updateContext.Radius;
double offsetFromCenter = radius * piePoint.OffsetFromCenter;
double offset = context.Definition.Margin.Left;
// calculate the position of the label, depending on its size
this.updateContext.Radius = radius - offset + offsetFromCenter;
this.updateContext.StartAngle = piePoint.startAngle;
double angle = piePoint.startAngle;
if (this.AngleRange.SweepDirection == ChartSweepDirection.Clockwise)
{
angle += piePoint.sweepAngle / 2;
}
else
{
angle -= piePoint.sweepAngle / 2;
}
Point middlePoint = this.updateContext.CalculateArcPoint(angle);
middlePoint.X += size.Width * Math.Cos(angle * RadMath.DegToRadFactor) / 2;
middlePoint.Y += size.Height * Math.Sin(angle * RadMath.DegToRadFactor) / 2;
RadRect labelRect = RadRect.Round(new RadRect(middlePoint.X - (size.Width / 2), middlePoint.Y - (size.Height / 2), size.Width, size.Height));
this.ArrangeUIElement(visual, labelRect);
this.updateContext.Radius = radius;
}
internal virtual void SetLabelContent(FrameworkElement visual, ChartSeriesLabelUpdateContext context)
{
if (context.Definition.Strategy != null)
{
if ((context.Definition.Strategy.Options & LabelStrategyOptions.DefaultVisual) == LabelStrategyOptions.DefaultVisual)
{
context.Definition.Strategy.SetLabelContent(context.Point, visual, context.DefinitionIndex);
}
}
}
internal virtual RadSize MeasureLabel(FrameworkElement visual, ChartSeriesLabelUpdateContext context)
{
if (context.Definition.Strategy != null)
{
if ((context.Definition.Strategy.Options & LabelStrategyOptions.Measure) == LabelStrategyOptions.Measure)
{
return(context.Definition.Strategy.GetLabelDesiredSize(context.Point, visual, context.DefinitionIndex));
}
}
return(PresenterBase.MeasureVisual(visual));
}
internal virtual DataTemplate GetLabelTemplate(ChartSeriesLabelUpdateContext context)
{
DataTemplate template = null;
if (context.Definition.Template != null)
{
template = context.Definition.Template;
}
else if (context.Definition.TemplateSelector != null)
{
template = context.Definition.TemplateSelector.SelectTemplate(context.Point, this);
}
return(template);
}
internal virtual FrameworkElement CreateDefaultLabelVisual(ChartSeriesLabelUpdateContext context)
{
if (context.Definition.Strategy != null)
{
if ((context.Definition.Strategy.Options & LabelStrategyOptions.DefaultVisual) == LabelStrategyOptions.DefaultVisual)
{
return(context.Definition.Strategy.CreateDefaultVisual(context.Point, context.DefinitionIndex));
}
}
TextBlock block = new TextBlock();
block.Style = context.Definition.DefaultVisualStyle;
return(block);
}
private void ProcessDataPointLabels(ChartSeriesLabelUpdateContext context)
{
// we have user-defined definition(s)
if (this.labelDefinitions.Count > 0)
{
int index = 0;
foreach (ChartSeriesLabelDefinition definition in this.labelDefinitions)
{
context.Definition = definition;
context.DefinitionIndex = index;
this.ProcessLabelDefinition(context);
index++;
}
}
else
{
context.Definition = CreateDefaultLabelDefinition(context.PlotDirection);
this.ProcessLabelDefinition(context);
}
}
internal virtual object GetLabelContent(ChartSeriesLabelUpdateContext context)
{
// we have a custom strategy that will provide a label content
if (context.Definition.Strategy != null)
{
if ((context.Definition.Strategy.Options & LabelStrategyOptions.Content) == LabelStrategyOptions.Content)
{
return(context.Definition.Strategy.GetLabelContent(context.Point, context.DefinitionIndex));
}
}
object label = null;
// we have a label binding - it will work if we are data-bound (run-time only)
if (context.Definition.Binding != null && !DesignMode.DesignModeEnabled)
{
if (!this.Model.isDataBound)
{
throw new ArgumentException("ChartSeriesLabelDefinition.Binding is valid when owning series is data-bound.");
}
object dataItem = context.Point.dataItem;
if (dataItem == null)
{
Debug.Assert(false, string.Format("Failed to retrieve data item for data point at index {0}", context.Point.CollectionIndex));
return(null);
}
label = context.Definition.Binding.GetValue(dataItem);
}
else
{
label = context.Point.Label;
}
if (label != null && !string.IsNullOrEmpty(context.Definition.Format))
{
return(string.Format(CultureInfo.CurrentUICulture, context.Definition.Format, label));
}
return(label);
}
private void ProcessLabelDefinition(ChartSeriesLabelUpdateContext context)
{
FrameworkElement visual = this.GetLabelVisual(context);
if (visual == null)
{
Debug.Assert(false, "No label visual created.");
return;
}
if (context.Definition.Strategy != null)
{
if ((context.Definition.Strategy.Options & LabelStrategyOptions.Arrange) == LabelStrategyOptions.Arrange)
{
RadRect labelSlot = context.Definition.Strategy.GetLabelLayoutSlot(context.Point, visual, context.DefinitionIndex);
this.ArrangeUIElement(visual, labelSlot);
return;
}
}
this.ArrangeLabel(visual, context);
}
private FrameworkElement CreateLabelVisual(ChartSeriesLabelUpdateContext context)
{
FrameworkElement visual;
DataTemplate template = this.GetLabelTemplate(context);
if (template != null)
{
visual = new ContentPresenter();
}
else
{
visual = this.CreateDefaultLabelVisual(context);
if (visual == null)
{
throw new ArgumentNullException("Label default visual cannot be null.");
}
}
this.labelLayer.Children.Add(visual);
return(visual);
}
private void UpdateLabels(ChartLayoutContext context)
{
int index = 0;
ChartSeriesModel series = this.Model;
ChartSeriesLabelUpdateContext labelContext = new ChartSeriesLabelUpdateContext();
labelContext.PlotDirection = this.Model.GetTypedValue <AxisPlotDirection>(AxisModel.PlotDirectionPropertyKey, AxisPlotDirection.Vertical);
labelContext.IsPlotInverse = this.Model.GetIsPlotInverse(labelContext.PlotDirection);
if (this.showLabelsCache)
{
foreach (DataPoint point in series.DataPointsInternal)
{
// point is empty or is laid-out outside the clip area, skip it from visualization.
if (point.isEmpty || !context.ClipRect.IntersectsWith(point.layoutSlot))
{
continue;
}
labelContext.Point = point;
labelContext.PointVirtualIndex = index;
this.ProcessDataPointLabels(labelContext);
index++;
}
}
while (index < this.labels.Count)
{
List <FrameworkElement> pointLabels = this.labels[index].Value;
foreach (FrameworkElement label in pointLabels)
{
label.Visibility = Visibility.Collapsed;
}
index++;
}
}
private FrameworkElement GetLabelVisual(ChartSeriesLabelUpdateContext context)
{
FrameworkElement element;
List <FrameworkElement> pointLabels;
if (context.PointVirtualIndex < this.labels.Count)
{
pointLabels = this.labels[context.PointVirtualIndex].Value;
if (pointLabels == null)
{
Debug.Assert(false, "Must have list of label visuals created at this point");
return(null);
}
if (pointLabels.Count > context.DefinitionIndex)
{
element = pointLabels[context.DefinitionIndex];
element.Visibility = Visibility.Visible;
}
else
{
element = this.CreateLabelVisual(context);
pointLabels.Add(element);
}
if (IsDefaultLabelVisual(element))
{
element.Style = context.Definition.DefaultVisualStyle;
}
}
else
{
element = this.CreateLabelVisual(context);
pointLabels = new List <FrameworkElement>();
pointLabels.Add(element);
this.labels.Add(new KeyValuePair <DataPoint, List <FrameworkElement> >(context.Point, pointLabels));
}
DataTemplate labelTemplate = this.GetLabelTemplate(context);
// NOTE: When Template or TemplateSelector is defined, the DataContext of the item labels' DataTemplate
// should be the respective DataPoint and not just calculated value.
if (labelTemplate != null)
{
// Assumes ContentPresenter has been created to handle this case.
// NOTE: this will override any ChartSeriesLabelDefinition.Binding logic now (if both Binding and Template/TemplateSelector are set)
ContentPresenter presenter = element as ContentPresenter;
presenter.Content = context.Point;
presenter.ContentTemplate = labelTemplate;
}
else
{
TextBlock textblock = element as TextBlock;
if (textblock != null)
{
// Assumes TextBlock has been created to handle the default case.
object label = this.GetLabelContent(context);
textblock.Text = label == null ? string.Empty : label.ToString();
}
else
{
// Assumes if user-defined label strategy is involved in visual creation (even if the strategy creates ContentPresenters),
// the strategy should be responsible for setting its content (via ChartSeriesLabelStrategy.SetLabelContent(...) method override)
this.SetLabelContent(element, context);
}
}
return(element);
}
private static RadRect GetLabelSlot(RadSize labelSize, ChartSeriesLabelUpdateContext context)
{
double x = double.NaN;
double y = double.NaN;
Thickness margin = context.Definition.Margin;
RadRect pointSlot = context.Point.layoutSlot;
switch (context.Definition.HorizontalAlignment)
{
case HorizontalAlignment.Center:
x = pointSlot.X + ((pointSlot.Width - labelSize.Width) / 2) + margin.Left - margin.Right;
break;
case HorizontalAlignment.Stretch:
x = pointSlot.X + ((pointSlot.Width - labelSize.Width) / 2);
break;
case HorizontalAlignment.Left:
// positive point with regular axis is equivalent to negative point with inverse axis
if (context.PlotDirection == AxisPlotDirection.Horizontal && !(context.Point.isPositive ^ context.IsPlotInverse))
{
// swap Left with Right due to negative values
x = pointSlot.Right - margin.Left + margin.Right;
}
else
{
x = pointSlot.X - labelSize.Width - margin.Right + margin.Left;
}
break;
case HorizontalAlignment.Right:
// positive point with regular axis is equivalent to negative point with inverse axis
if (context.PlotDirection == AxisPlotDirection.Horizontal && !(context.Point.isPositive ^ context.IsPlotInverse))
{
// swap Left with Right due to negative values
x = pointSlot.X - labelSize.Width - margin.Left + margin.Right;
}
else
{
x = pointSlot.Right + margin.Left - margin.Right;
}
break;
}
switch (context.Definition.VerticalAlignment)
{
case VerticalAlignment.Center:
y = pointSlot.Y + ((pointSlot.Height - labelSize.Height) / 2) + margin.Top - margin.Bottom;
break;
case VerticalAlignment.Stretch:
y = pointSlot.Y + ((pointSlot.Height - labelSize.Height) / 2);
break;
case VerticalAlignment.Bottom:
// positive point with regular axis is equivalent to negative point with inverse axis
if (context.PlotDirection == AxisPlotDirection.Vertical && !(context.Point.isPositive ^ context.IsPlotInverse))
{
// swap Bottom with Top due to negative values
y = pointSlot.Y - labelSize.Height - margin.Top + margin.Bottom;
}
else
{
y = pointSlot.Bottom + margin.Top - margin.Bottom;
}
break;
case VerticalAlignment.Top:
// positive point with regular axis is equivalent to negative point with inverse axis
if (context.PlotDirection == AxisPlotDirection.Vertical && !(context.Point.isPositive ^ context.IsPlotInverse))
{
// swap Top with Bottom due to negative values
y = pointSlot.Bottom + margin.Bottom - margin.Top;
}
else
{
y = pointSlot.Y - labelSize.Height - margin.Bottom + margin.Top;
}
break;
}
return(new RadRect(x, y, labelSize.Width, labelSize.Height));
}
internal virtual void ArrangeLabel(FrameworkElement visual, ChartSeriesLabelUpdateContext context)
{
RadSize size = this.MeasureLabel(visual, context);
this.ArrangeUIElement(visual, GetLabelSlot(size, context));
}