WP8.1 Storyboard Scale while Translate Manipulation

Question

I'm using C# for Windows Phone 8.1.

What I have: I drag an transparent (not visible, but accessible) slider and a Grid follows the path of the slider with TranslateX Manipulation:

<Grid Opacity="1" x:Name="innerGrid" HorizontalAlignment="Left" Margin="4,0,0,0">
  <Grid.RenderTransform>
     <CompositeTransform TranslateX="{Binding transXexact}" />
  </Grid.RenderTransform>

  [... stuff inside Grid ...]

</Grid>
<Slider x:Name="sliderPercent2" Minimum="0" Maximum="100" Value="0" Opacity="0" Style="{StaticResource customSliderBigOverlay}" ValueChanged="sliderPercent_ValueChanged" ManipulationMode="TranslateX" ManipulationStarted="sliderPercent2_ManipulationStarted" ManipulationCompleted="sliderPercent2_ManipulationCompleted" />

and the code side:

private void sliderPercent_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
{
    if (sender != null)
    {
        myPercView.transX = Convert.ToInt32(e.NewValue);
        myPercView.transXexact = e.NewValue * (Window.Current.Bounds.Width - 38 - 40 - 10) / 100;
    }
}

private void sliderPercent2_ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)
{
    Storyboard s = new Storyboard();

    DoubleAnimation doubleAni = new DoubleAnimation();
    doubleAni.To = 0;
    doubleAni.Duration = new Duration(TimeSpan.FromMilliseconds(200));
    Storyboard.SetTarget(doubleAni, innerGrid);
    Storyboard.SetTargetProperty(doubleAni, "Opacity");

    s.Children.Add(doubleAni);

    s.Begin();
}

private void sliderPercent2_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
    Storyboard s = new Storyboard();

    DoubleAnimation doubleAni = new DoubleAnimation();
    doubleAni.To = 1;
    doubleAni.Duration = new Duration(TimeSpan.FromMilliseconds(300));
    Storyboard.SetTarget(doubleAni, innerGrid);
    Storyboard.SetTargetProperty(doubleAni, "Opacity");

    s.Children.Add(doubleAni);

    s.Begin();
}

now this works all fine, but I want to go further. Now I also want the innerGrid to Zoom into 0. Thatfore I need ScaleX and ScaleY. I can add it to the Storyboard with this code:

var xAnim = new DoubleAnimation();
var yAnim = new DoubleAnimation();
xAnim.Duration = TimeSpan.FromMilliseconds(300);
yAnim.Duration = TimeSpan.FromMilliseconds(300);
xAnim.To = 1;
yAnim.To = 1;
Storyboard.SetTarget(xAnim, innerGrid);
Storyboard.SetTarget(yAnim, innerGrid);
Storyboard.SetTargetProperty(xAnim, "(UIElement.RenderTransform).(CompositeTransform.ScaleX)");
Storyboard.SetTargetProperty(yAnim, "(UIElement.RenderTransform).(CompositeTransform.ScaleY)");

BUT then it does NOT translate in X direction, when I move the slider, but just zoom into 0 on the position it was, when I started the manipulation.

What I want: Scale the Grid into 0 with animation while still applying TranslateX Manipulation, so the Grid follows my movement while zooming out.

Answer 1

The trick was simpler as expected - One must just put another Grid over the fading out Grid and animate those Grids seperately.