LegendItem Text Color

[Jeroen]

Hello,

I'm trying to change the Legenditem text color without expression blend.
When the enduser clicks a button the foreground color of the legenditem needs to go black, another button turns it white.

Kind regards,

Jeroen

[Lancelot]

 

[Lancelot]

Hi Jeroen,

Here is a list of the properties that make up the ChartLegendStyle:

LegendForeground - a brush, that represent the foreground color of the ChartLegend.

LegendBackground - a brush, that represents the background color of the ChartLegend.

LegendBorderBrush - a brush, that represents the border color of the ChartLegend.

LegendBorderThickness - represents the thickness of the border around the ChartLegend.

LegendItemMarkerShape - represents the shape of the marker inside the ChartLegend's item.

ChartLegendStyle - the Style, applied to the ChartLegend control.

 

And here is the list of properties that make up the ChartLegendItemStyle:

LegendForeground - a brush, that represents the foreground color of the ChartLegendItem.

LegendItemMarkerMask - a brush, that represents the background of the mask element for the ChatLegendItem's marker.

LegendItemMarkerMaskStroke - a brush, that represents the border color of the mask element for the ChatLegendItem's marker.

LegendItemMarkerMaskStrokeThickness - that represents the thickness of the border of the mask element for the ChatLegendItem's marker.

LegendItemMarkerMaskStroke - a brush, that represents the opacity mask of the mask element for the ChatLegendItem's marker.

LegendItemMarkerMask - a brush, that represents the background of the secondary mask element for the ChatLegendItem's marker.

ChartLegendItemStyle - the Style, applied to the ChartLegendItem control.

You can access them from the code behind in a button_click event by iterating through the visual tree for the type Telerik.Windows.Controls.Charting.ChartLegend  and then the legend items with Telerik.Windows.Controls.Charting.LegendItem.


Once you iterate for each type, you can then assign a brush to it. in your case it would be

legendItem.Foreground = new SolidcolorBrush(Colors.Black);

and also

legendItem.Foreground = new SolidcolorBrush(Colors.White);

I hope this helps, good luck!

Lancelot

[Rosko]

Hi Jeroen,

There are two possible ways to solve your issue. The first one is to make your own style where you bind the Foreground color to a property in your object. 
The other way is what Lancelot suggested -  to set it through the visual tree. Here's an example:

private void Button_Click(object sender, RoutedEventArgs e)
        {
            var legend = this.radChart.FindChildByType<Telerik.Windows.Controls.Charting.ChartLegend>();
            var legendItems = legend.ItemsSource.Cast<Telerik.Windows.Controls.Charting.ChartLegendItem>();

            foreach (var item in legendItems)
            {
                item.Background = new SolidColorBrush(Colors.Red);
            }

        }

Greetings,

Rosko

the Telerik team