CODEWITHSUNDEEP
c#wpfslider
Taufiq Abdur Rahman
Taufiq Abdur Rahman

Reputation: 1388

WPF: Slider Thumb Outside the SliderControl

I need to extend a slider thumb to stick out of its control. Is that possible then how? If not how can i achieve this? Please Help.

For e.g My slider's height is 50 but the thumb must start -50px outside the control and have 100 height.

Here yellow is the slider control, red is the thumb now I need the thumb to extend add the orange part to the same thumb.

Thanks

Upvotes: 0

Views: 2050

Answers (3)

Sergey Grischenko
Sergey Grischenko

Reputation: 31

Wrap thumb by Canvas Control and set ClipToBOunds= "False" like this

 <Style x:Key="SliderThumbStyle"
        TargetType="{x:Type Thumb}">
         <Setter Property="SnapsToDevicePixels"
           Value="true" />
         <Setter Property="OverridesDefaultStyle"
           Value="true" />
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type Thumb}">
                     <Canvas>
                         <Border Width="16" Height="16" Canvas.Top="-3" ClipToBounds="False" Background="Black" />
                     </Canvas>
                  </ControlTemplate>
             </Setter.Value>
         </Setter>
     </Style>

Upvotes: 0

Sheridan
Sheridan

Reputation: 69959

If you can build a UI using WPF controls, then you can define a new ControlTemplate... it really is no different. Here is how... always start by implementing the default ControlTemplate so that your object initially looks 'normal'. Then simply locate the part you want to change... and change it:

enter image description here

The trick with this one is that the Thumb does not stick out of the control, instead the whole control is enlarged. Now the default ControlTemplate is so large that I'm not going to add all of the XAML here. Start with the default one that @VimalCK kindly added a link to (don't forget to include the Resources) and then add these changes (hopefully I've remembered all that I changed:

    <Style x:Key="SliderThumbStyle" TargetType="{x:Type Thumb}">
        <Setter Property="SnapsToDevicePixels" Value="true" />
        <Setter Property="OverridesDefaultStyle" Value="true" />
        <Setter Property="Height" Value="200" />
        <Setter Property="Width" Value="14" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <Grid>
                        <Ellipse x:Name="Ellipse" StrokeThickness="1" Height="14" 
                            VerticalAlignment="Bottom">
                            ...  <!--Use default XAML here-->
                        </Ellipse>
                        <Rectangle Height="200" Width="2" Stroke="Red" />
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Then inside the HorizontalSlider ControlTemplate, change the TrackBackground Border definition to this:

<Border x:Name="TrackBackground" VerticalAlignment="Bottom" Margin="0,0,0,5" 
    CornerRadius="2" Height="4" Grid.Row="1" BorderThickness="1">
    ...  <!--Use default XAML here-->
</Border>

Then use it with a Height like this:

<Slider Height="210" Maximum="100" Minimum="0" TickPlacement="BottomRight"
VerticalAlignment="Bottom" />

I think I documented all the changes that I made... if not, you might need to set a Height, or a VerticalAlignment to Bottom on something... either way, just experiment until you get what you want. Exploring how the default ControlTemplates have been defined is a great way to learn WPF.

Upvotes: 1

Vimal CK
Vimal CK

Reputation: 3563

The WPF controls provided by Microsoft has a default style and template which is available in MSDN and you can modify this based on your requirements. For Slider control Style and Template please visit below link

http://msdn.microsoft.com/en-us/library/ms753256(v=vs.110).aspx

Upvotes: 0

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