Canvas is clipped when size is too big - wpf

Question

I am using a canvas with the an ImageBrush to dispaly an image. I am setting the size of the canvas to the original size of the image so I can get the coordinates when I move the mouse etc.
The problem is that when I put the canvas in a control (Grid for example) with a smaller size the Canvas is clipped.
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
Is there a way to keep the canvas size without being clipped?

Answer 1

I've been meaning to dig deeper in to the source to work out where the clipping occurs for a while now, but never get around to doing it. I've been using a not-so-nice trick of inserting a Canvas into the visual tree when this happens as a workaround.
There are a number of controls that clip the child visuals; Grid, StackPanel, etc. As I mentioned the usual quick fix is to use a Canvas after the container that causes the clip.
In your snippet are there more containers higher up the visual tree?
If the depth was actually something like this:-
<StackPanel>
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
</StackPanel>
Then this might cause clipping. If you insert another Canvas further up the visual tree then this clipping is removed.
<StackPanel>
<Canvas>
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
</Canvas>
</StackPanel>
This workaround can then become problematic if it alters other layout needs for other controls.