I have an app in which I sometimes want to grey out images that are not the
current images "of interest". So I'm using a GrayscaleDecorator, which
works fine for solid images. But if the images have transparent parts, I
want the decorator to leave them unaffected, so that the background shows
through, rather than turning those pixels black. Is there any way to do
that? Is this a bug in the decorator?
Example -- fill in your favorite test image that uses transparency:
<Window
xmlns:effects="org.apache.pivot.wtk.effects"
xmlns="org.apache.pivot.wtk">
<BoxPane styles="{backgroundColor:'white'}">
<ImageView image="@test.png" styles="{backgroundColor:null}" />
<ImageView image="@test.png" styles="{backgroundColor:null}">
<decorators>
<effects:GrayscaleDecorator />
</decorators>
</ImageView>
</BoxPane>
</Window>
In this particular example, I could have set the background of the ImageView
to be white instead of null and it would look fine, but in general the
background won't be white, and I don't want the decorator to modify those
background pixels.
