如何将 ScaleTransformation.X 绑定到 Silverlight 3 中的滑块 [英] How to bind ScaleTransformation.X to slider in Silverlight 3

问题描述

我需要缩放 Canvas.在 WPF 中，可以将 ScaleTransformation.X 绑定到 slider.Value.

I need to zoom Canvas. In WPF it is possible to bind ScaleTransformation.X to slider.Value.

我无法在 Silverlight 中做同样的事情 - 一些错误.

I'm not able to do the same in Silverlight - some errors.

SL3 支持吗?

谢谢.

推荐答案

这不起作用的原因是在 SL3 中绑定目标需要是 FrameworkElement.(此限制已在 SL4 中解除，但目前无济于事).

The reason this doesn't work is that in SL3 the binding target needs to be a FrameworkElement. (This restriction is lifted in SL4 but that doesn't help right now).

然而，解决方案只需要一点横向思维(或在这种情况下向后思维).源对象不需要是框架元素.所以答案是反向绑定，即将绑定放在 Slider Value 属性上，并将其置于 TwoWay 模式.

However the solution just takes a little lateral thinking (or in this case backward thinking). The source object does not need to be a Framework element. So the answer is reverse the binding, that is put the binding on the Slider Value property and put it in to TwoWay mode.

<Border Width="200" Height="200">
    <Border.RenderTransform>
        <ScaleTransform x:Name="TargetTransform" />
    </Border.RenderTransform>
    <!-- Some Content Here -->
</Border>

<Slider Value="{Binding ScaleX, ElementName=TargetTransform, Mode=TwoWay}"
    Width="200" Canvas.Top="250" 
    Minimum="0.1" Maximum="2.0" />

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