在WPF中将滑块值绑定到其拇指的高度

I have a databinding problem in WPF.

我在WPF中有一个数据绑定问题。

I would like to "customise" a slider in a way that the thumb grows when you move the slider to the right and the thumb shrinks when you move the slider to the left.

当您将滑块向右移动时，我希望以拇指增长的方式“自定义”滑块，当您将滑块向左移动时，拇指会缩小。

So I edited the template for the slider and changed the look of the slider so the slider looks like I want it to.

所以我编辑了滑块的模板并更改了滑块的外观，因此滑块看起来像我想要的那样。

But now I have to bind the height of the thumb to the value of the slider but I do not know how that works.

但现在我必须将拇指的高度绑定到滑块的值，但我不知道它是如何工作的。

I did some simple data binding things but I cannot figure out how I can bind this "thumb height" that's inside of my slider's template to the slider's value that's inside the User Control where my slider is in.

我做了一些简单的数据绑定，但我无法弄清楚如何将滑块模板内部的“拇指高度”绑定到我的滑块所在的用户控件内的滑块值。

So how can I do it?

那我该怎么办呢？

2 个解决方案

#1

You can use RelativeSource binding (Height="{Binding Value, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Slider}}}").

您可以使用RelativeSource绑定（Height =“{Binding Value，RelativeSource = {RelativeSource FindAncestor，AncestorType = {x：Type Slider}}}”）。

Here is an example of the thumb style, that depends on Slider.Value:

这是一个拇指样式的例子，取决于Slider.Value：

<Style x:Key="SliderThumbStyle" TargetType="{x:Type Thumb}">
  <Setter Property="SnapsToDevicePixels" Value="true"/>
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="Width" Value="14"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Thumb}">
        <Ellipse 
          Name="Ellipse" 
          Fill="#C0C0C0"
          Stroke="#404040" 
          Height="{Binding Value, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Slider}}}"
          StrokeThickness="1" />
        <ControlTemplate.Triggers>
          <Trigger Property="IsMouseOver" Value="True">
            <Setter TargetName="Ellipse" Property="Fill" Value="#808080"/>
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter TargetName="Ellipse" Property="Fill" Value="#EEEEEE"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

Hope this helps.

希望这可以帮助。

Cheers Anvaka

干杯安瓦卡

#2

Check my question and answer here -

在这里查看我的问题和答案 -

In WPF/XAML how do I change the size of a paragraph of text using a scroll bar?

在WPF / XAML中，如何使用滚动条更改文本段落的大小？

If you have something like this:

如果您有这样的事情：

<ScrollBar x:Name="scroll1"></ScrollBar>

<Image Height="{Binding ElementName=scroll1, Path=Value}" />

NB I'm not 100% sure of the syntax for the image, so you'll need to take this as pseudo code.

NB我不是100％确定图像的语法，所以你需要将它作为伪代码。

#1