How to Customize the Default Tooltip Background in WPF Chart?
The WPF Chart is used to show the y-value or the data point value of related ChartSegment, when the user moves the mouse pointer over any chart segment. Chart tooltip is enabled by setting the ShowTooltip property of ChartSeries to true.
The following steps explains how to customize the default tooltip arrow pointer background:
Step 1: Create an instance of ChartTooltipBehavior class and add it to the SfChart Behaviors collection.
<chart:SfChart.Behaviors> <chart:ChartTooltipBehavior Position="Pointer"/> </chart:SfChart.Behaviors>
Step 2: Create a style with TargetType as Path and set the setter values for Fill and Stroke property as Transparent to customize the arrow pointer background in the tooltip. Apply this path style value for the Style property of ChartTooltipBehavior as shown in the following code example.
<chart:SfChart.Resources>
<Style TargetType="Path" x:Key="tooltipStyle">
<Setter Property="Stroke" Value="Transparent"/>
<Setter Property="Fill" Value="Transparent"/>
</Style>
</chart:SfChart.Resources>
…
<chart:SfChart.Behaviors>
<chart:ChartTooltipBehavior Style="{StaticResource tooltipStyle}"
Position="Pointer"/>
</chart:SfChart.Behaviors>
Step 3: Create a custom tooltip template and set it to the TooltipTemplate property of ChartSeries.
The following code example illustrates how to customize the chart tooltip arrow pointer background.
<chart:SfChart x:Name="Chart" Palette="BlueChrome">
<chart:SfChart.Resources>
<DataTemplate x:Key="tooltipTemplate">
<Border Background="Black" Margin="0,0,0,-10"
Padding="4" CornerRadius="3">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Item.Demand}" Foreground="White"/>
<TextBlock Text=" : " Foreground="White" />
<TextBlock Text="{Binding Item.Year2010}" Foreground="White"/>
</StackPanel>
</Border>
</DataTemplate>
<Style TargetType="Path" x:Key="tooltipStyle">
<Setter Property="Stroke" Value="Transparent"/>
<Setter Property="Fill" Value="Transparent"/>
</Style>
</chart:SfChart.Resources>
…
<chart:ColumnSeries ItemsSource="{Binding Demands}"
XBindingPath="Demand"
YBindingPath="Year2010"
ShowTooltip="True"
TooltipTemplate="{StaticResource tooltipTemplate}"/>
<chart:SfChart.Behaviors>
<chart:ChartTooltipBehavior Style="{StaticResource tooltipStyle}"
Position="Pointer"/>
</chart:SfChart.Behaviors>
</chart:SfChart>
Output
See also
How to customize the tooltip in chart
How to display the tooltip when the mouse is in any region of the FastLineBitmapSeries in WPF Charts
How to set the duration for chart tooltip
Conclusion
I hope you enjoyed learning about how to customize the default tooltip background in WPF Chart.
You can refer to our WPF Chart feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our WPF Chart example to understand how to create and manipulate data.
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