Dynamically Modify CSS from GWT

for example I have a css in test.css given below.

.test {

开发者_运维百科  top:100px;

 }

how can i increment top property from GWT ?

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e.g. you can retrieve the Style of the element and alter that. other type of widgets might have other functionalities

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You can hold value in memory and just set it at any time you need it via runtime substitution which is built-in GWT feature.

@eval userBackground com.module.UserPreferences.getUserBackground();
div {
   background: userBackground;
}

public class UserPreferences {
    public static String getUserBackground() {
        return "#FF0000";
    }
}

Please check GWT specs: http://www.gwtproject.org/doc/latest/DevGuideClientBundle.html#Runtime_substitution