Question

wpf 这种形变的属性，如何用后台实现绑定啊～～

<Canvas >
<Slider Name="s1" />
<Slider Name="s2" />
<Thumb x:Name="t1" >
<Thumb.RenderTransform>
<TransformGroup>
<RotateTransform Angle="{Binding ElementName=s1,Path=Value}" />
<ScaleTransform ScaleX="{Binding ElementName=s2,Path=Value}" ScaleY="{Binding ElementName=s2,Path=Value}"/>
</TransformGroup>
</Thumb.RenderTransform>
</Thumb>
</Canvas>

Answer 1

Transform后台只提供了SetValue和SetCurrentValue没有提供SetBinding。建议用Slider事件去做。
前台：
<Slider Name="s1" ValueChanged="s1_ValueChanged"/>
<Slider Name="s2" ValueChanged="s2_ValueChanged"/>
<Thumb x:Name="t1">
<Thumb.RenderTransform>
<TransformGroup x:Name="transGroup">
<!--<RotateTransform Angle="{Binding ElementName=s1, Path=Value}" />
<ScaleTransform ScaleX="{Binding ElementName=s2, Path=Value}" ScaleY="{Binding ElementName=s2, Path=Value}"/>-->
<RotateTransform x:Name="Trans1"/>
<ScaleTransform x:Name="Trans2"/>
</TransformGroup>
</Thumb.RenderTransform>
</Thumb>
后台：
private void s1_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Trans1.Angle = s1.Value;
}
private void s2_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Trans2.ScaleX = s2.Value;
Trans2.ScaleY = s2.Value;
}