Thumb and Thumb Overlay in WinUI Slider

26 May 202110 minutes to read

This section explains how to customize the thumb and thumb overlay in the Slider.

Thumb - It is one of the elements of Slider, which is used to drag and change the selected values of the Slider.
Thumb overlay - It is rendered around the thumb and it will be displayed, while interacting with thumb.

Thumb Type

You can change the thumb type using the ThumbType property. The default value of ThumbType is ThumbType.Circle.

<slider:SfSlider Value="50"
                 ThumbType="Oval" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbType = ThumbType.Oval;
this.Content = sfSlider;

Slider with thumb type customization

Thumb Height and Width

You can change the thumb height and width of the slider using the ThumbHeight and ThumbWidth properties respectively. The default values of both properties are 20.

<slider:SfSlider Value="50"
                 ThumbHeight="30"
                 ThumbWidth="30"
                 ActiveTrackHeight="8"
                 InactiveTrackHeight="8" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbHeight = 30;
sfSlider.ThumbWidth = 30;
sfSlider.ActiveTrackHeight = 8;
sfSlider.InactiveTrackHeight = 8;
this.Content = sfSlider;

Slider with thumb height and width customization

Thumb Background

You can change the thumb background of the slider using the ThumbBackground property.

<slider:SfSlider Value="50"
                 ThumbBackground="#2A934D" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbBackground = new SolidColorBrush(ColorHelper.FromArgb(255, 42, 147, 77));;
this.Content = sfSlider;

Slider with thumb background customization

Thumb Hover Background

You can change the thumb hover background of the slider using the SyncfusionSliderThumbBackgroundPointerOver resource key.

<Page.Resources>
    <SolidColorBrush x:Key="SyncfusionSliderThumbBackgroundPointerOver">#009688</SolidColorBrush>
</Page.Resources>

<slider:SfSlider Value="50"
                 ThumbBackground="#33b35c" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbBackground = new SolidColorBrush(ColorHelper.FromArgb(255, 42, 147, 77));
this.Content = sfSlider;

Slider with thumb hover background customization

Thumb Pressed Background

You can change the thumb pressed background of the slider using the SyncfusionSliderThumbBackgroundPressed resource key.

<Page.Resources>
    <SolidColorBrush x:Key="SyncfusionSliderThumbBackgroundPointerOver">#009688</SolidColorBrush>
    <SolidColorBrush x:Key="SyncfusionSliderThumbBackgroundPressed">#288e49</SolidColorBrush>
</Page.Resources>

<slider:SfSlider Value="50"
                 ThumbBackground="#33b35c" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbBackground = new SolidColorBrush(ColorHelper.FromArgb(255, 42, 147, 77));
this.Content = sfSlider;

Slider with thumb pressed background customization

Thumb Style

The ThumbStyle property allows you to define the style for the thumb as shown in the following code example.

<coreconverters:FormatStringConverter x:Key="FormatStringConverter" />

<Style x:Name="thumbStyle"
       TargetType="Thumb">
    <Setter Property="BorderBrush"
            Value="WhiteSmoke" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Thumb">
                <Grid>
                    <Ellipse Height="{TemplateBinding Height}"
                             Width="{TemplateBinding Width}"
                             Fill="{TemplateBinding BorderBrush}"
                             Stroke="{TemplateBinding Background}"
                             StrokeThickness="2" />
                    <TextBlock Text="{Binding Converter={StaticResource FormatStringConverter},
                                              ConverterParameter='N0'}"
                               FontSize="14"
                               Margin="0,0,0,2"
                               HorizontalTextAlignment="Center"
                               VerticalAlignment="Center" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
    
<slider:SfSlider Value="50"
                 ShowToolTip="False"
                 ThumbHeight="30"
                 ThumbWidth="30"
                 ThumbStyle="{StaticResource thumbStyle}" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ShowToolTip = false;
sfSlider.ThumbHeight = 30;
sfSlider.ThumbHeight = 30;
sfSlider.ThumbStyle = this.Resources["thumbStyle"] as Style;
this.Content = sfSlider;

slider with thumb style customization

NOTE

Its DataContext is current value of thumb.

Thumb Overlay Radius

The ThumbOverlayRadius property allows you to define the radius for the overlay as shown in the following code example. The default value of ThumbOverlayRadius property is 10.

<slider:SfSlider Value="50"
                 ShowToolTip="False"
                 ThumbOverlayRadius="20" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ShowToolTip = false;
sfSlider.ThumbOverlayRadius = 20;
this.Content = sfSlider;

slider with overlay radius customization

Thumb Overlay Fill

The ThumbOverlayFill property allows you to define the fill color for the overlay as shown in the following code example.

<slider:SfSlider Value="50"
                 ThumbOverlayFill="Red" />
SfSlider sfSlider = new SfSlider();
sfSlider.Value = 50;
sfSlider.ThumbOverlayFill = new SolidColorBrush(Colors.Red);
this.Content = sfSlider;

slider with overlay fill customization

NOTE

Overlay effects displayed with 0.3 opacity.

Events

ThumbDragStarted

The ThumbDragStarted event raised when the thumb drag is started.

<slider:SfSlider Value="50"
                 ThumbDragStarted="SfSlider_ThumbDragStarted" />
private void SfSlider_ThumbDragStarted(object sender, DragStartedEventArgs e)
{
    //Perform action here.
}

ThumbDragCompleted

The ThumbDragCompleted event raised when the thumb drag is completed.

<slider:SfSlider Value="70"
                 ThumbDragCompleted="SfSlider_ThumbDragCompleted" />
private void SfSlider_ThumbDragCompleted(object sender, DragCompletedEventArgs e)
{
    //Perform action here.
}