Re: CssResource - common style - good practice

If this is really for *every* button, then you can use the gwt-Button CSS class name, that's automatically added by each button in the constructor. In a CssResource, make sure you have an "@external .gwt-Button;" line to selectively disable obfuscation for that class name.

That way, you only ever have to inject your CssResource *once* for your whole app.

If you need to keep things "per button", then instead of using the same *.css source in many CssResource (<ui:style> generates a CssResource), which will result in your styles duplicated for each *.ui.xml file (CSS class names would be obfuscated with different names), then create a CssResource interface with the @Source("MyStyle.css"), put it in a ClientBundle, GWT.create() and ensureInjected() it somewhere (e.g. in your onModuleLoad), and then use it in your *.ui.xml with a <ui:with> (see http://code.google.com/webtoolkit/doc/latest/DevGuideUiBinder.html#Using_an_external_resource ).

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