Assign WritableBitmap to an ImageBrush.ImageSource property

Question

I want to have an animated panorama control background in Windows Phone application.

I have an algorithm that constantly draws onto the WritableBitmap the desired image.

I have bound the Panoramas' background property to ViewModels' BackgroundImageBrush property.

Then at construction time of my ViewModel I assign

BackgroundImageBrush = new ImageBrush {ImageSource = _outputWriteableBitmap};

I get no Binding errors in output and when I check the binding at with the debugger, I get the correct linkage of BackgroundImageBrush.ImageSource to a WritableBitmap.

Every time I redraw the _outputWriteableBitmap I do call Invalidate.

Still my panorama background is blank!

What am I doing wrong in theory? Is it even possible to have an animated background in Windows Phone's Panorama?

Thanks.

Answer 1

A way offered in the comments below the question has the potential answer.

This blog post shows how to at least change the panorama background at runtime, tough I didn't manage get it to play animation generated at runtime.

Answer 2

The first step here is to make sure that the binding is actually working. Try creating a static image brush and binding your panorama background to that. If that works, then the issue is with the way you're updating the image--either the image isn't rendering properly or you're not calling PropertyChanged correctly.

I've bound a panorama background image to a property in a viewmodel before, so it is doable.

Incidentally, how often will you be updating this image? It could be brutal on your performance if it happens frequently.