Hi,
I have a set of static objects which are retrieved from the server and
rendered in a custom widget on the client. Each of these objects has
an image associated with it. I want these images to be themeable,
such that the entire set of images used for these objects can be
swapped out. For example, say there is a Cat object and a Dog object,
and there is a 'domestic' theme and a 'wild' theme. The theme is a
user option. If the wild theme is selected, the images should be a
cheetah and a dingo. With the domestic theme they would be a calico
cat and a golden retriever.
My thought was that I could distribute these image themes as
ClientBundles. So I implemented something like this:
public interface ImageTheme {
ImageResource cat();
ImageResource dog();
}
public interface WildImageTheme extends ClientBundle, ImageTheme {
@Source("cheetah.jpg")
ImageResource cat();
@Source("dingo.jpg")
ImageResource dog();
}
public interface DomesticImageTheme extends ClientBundle, ImageTheme {
@Source("calico.jpg")
ImageResource cat();
@Source("golden-retriever.jpg")
ImageResource dog();
}
But then I end up needing some ugly and hard-to-maintain binding code
on the client like this:
public static ImageTheme CURRENT_THEME = (ImageTheme) GWT.create
(DomesticImageTheme.class)
public ImageResource getImageResource(String animalName) {
if ("Cat".equals(animalName)) {
return CURRENT_THEME.cat();
} else if ("Dog".equals(animalName)) {
return CURRENT_THEME.dog();
}
[...]
}
If it were available to me, I could use reflection to bind the animal
names to matching method names, but obviously it isn't. Deferred
binding is described as GWT's answer to reflection, but does it fit
here? Is my ClientBundle as theme pack paradigm flawed? Does anyone
have a suggestion for a better way to accomplish this?
Thanks,
Bob
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