Re: How to use different CSS/Code for different browsers/devices/os?

I use Google Gin and switch Ginjectors based on a form factor property in my module XML so its basically the factory approach.

interface AppInjector extends Ginjector {

  App getApp();

}

@GinModule(DesktopModule.class)

interface DesktopAppInjector extends AppInjector {}

// just for illustration you can also use custom multi valued config properties of your *.gwt.xml file that contain full qualified class names of gin modules

@GinModules(value = { TabletModule.class }, properties = {"common.config", "tablet.config"})

interface TabletAppInjector extends AppInjector {}

Because you can not use GWT.create(AppInjector.class) to initialize GIN (because of the GinModule annotations being defined on sub interfaces) you need additional classes for deferred binding:

interface AppInjectorProvider {

  AppInjector get();

}

class DesktopAppInjectorProvider implements AppInjectorProvider {

  public AppInjector get() {

     return GWT.create(DesktopAppInjector.class);

  }

}

class TabletAppInjectorProvider implements AppInjectorProvider {

  public AppInjector get() {

     return GWT.create(TabletAppInjector.class);

  }

}

And finally the entry point

class AppEntryPoint implements EntryPoint {

  void onModuleLoad() {

    AppInjectorProvider injector = GWT.create(AppInjectorProvider.class);

    injector.get().getApp().start();

  }

}

With the code above I can pretty much configure everything inside gin modules. 

For high resolution images its a lot better to extend the ClientBundle mechanism. An example for retina images can be found at https://github.com/kDCYorke/RetinaImages

In general I would recommend using vector icons (e.g. "Font Awesome" or http://glyphicons.com/) so you don't need that retina image thing just for icons.

-- J.

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