Binding between two xaml windows

Question

I have the following slider:

<Slider x:Name="uiScaleSlider" Value="1" Minimum="0.5" Maximum="1.5" />

Which affects a scale transformation:

 <ScaleTransform  
      CenterX="0" 
      CenterY="0" 
      ScaleX="{Binding ElementName=uiScaleSlider,Path=Value}"  
      ScaleY="{Binding ElementName=uiScaleSlider,Path=Value}" />

However they each are on seperate windows (ie the slider is on an 'options' screen and the scaletransform is on the main window).

How do I bind the two windows so the slider and scaletransform can connect and therefore operate?

Answer 1

You can manage to have App variable, which can be shared among the views. I'm not sure its cleaner way. But i have something similar in the production.

In you App.xaml.cs

Create your model for the binding.

private static int _minimumValue;
public static int MinimumValue
 {
        get
        {
            return _minimumValue;
        }
        set
        {
            _minimumValue = value;
            RaisePropertyChangedStatic("MinimumValue");
        }
}

Option Screen Xaml should look like this

<Slider x:Name="uiScaleSlider" Value="1" 
        Minimum={Binding MinimumValue, Source="{x:Static Application.Current}" />

MainWindow.Xaml

<ScaleTransform  
  CenterX="0" 
  CenterY="0" 
  ScaleX={Binding MinimumValue, Source="{x:Static Application.Current}" />