Enum-based ComboBox?

[bpossolo]

The solutions above all sound pretty overkill however they may be a bit outdated.

You can simply leverage SimpleComboBox to list enums as follows:

public enum Condition {

New,
Used,
Damaged

}

SimpleComboBox<Condition> conditionCombo = new SimpleComboBox<Condition>();

for( Condition condition : Condition.values() )

conditionCombo.add(condition);

You can control the text that renders by overriding the Condition.toString() method.

if you need more power over what is displayed (for example, multilingual apps), then you can either override the SimpleComboBox methods (or provide a property editor) or with some clever tricks on the SimpleComboValue class (which the SimpleComboBox uses internally)

[Colin Alworth]

The code really hasn't changed too much, and while you could override those things, they would inevitably need a switch case, or a map lookup, or something to finally get the i18n'd value. If you have many enums throughout your app, it quickly becomes clear that the i18n has to be on the data side of things, not just in subclassing the view over and over.

[The_Jackal]

I had a case where I didn't want to use the enum's toString() method, rather I wanted to call a getLabel() method that does my GWT.create() call for i18n.

I didn't want to use toString() for the i18n as I want toString() to still work on the server side.

Here's the code to make to call a different method to get the text representation. It does the following:

• Convert the value in the ComboBox with a property editor to call getLabel()
• Convert the values in the list with a ModelProcessor to call getLabel() and Template

The ComboBox that uses Condition enum (with a getLabel() method for i18n)

final SimpleComboBox<Condition> combo = new SimpleComboBox<Condition>();
combo.setFieldLabel("Condition");
combo.setName("condition");
combo.add(Arrays.asList(Condition.values()));        
combo.setEditable(false);
combo.setAllowBlank(false);
combo.setTriggerAction(TriggerAction.ALL);
combo.setSimpleValue(Condition.NEW);

// Replace the text in the box with the enums label
ListModelPropertyEditor<SimpleComboValue<Condition>> propEditor = 
    new ListModelPropertyEditor<SimpleComboValue<Condition>>()
    {
         public String getStringValue(SimpleComboValue<Condition> value) {
             return value.getValue().getLabel();
         }
};

propEditor.setDisplayProperty("label");
combo.setPropertyEditor(propEditor);
        
// Replace the text in the list with the enums labels
combo.getView().setModelProcessor(new ModelProcessor<SimpleComboValue<Condition>>() {
    public SimpleComboValue<Condition> prepareData(SimpleComboValue<Condition> model) {
        model.set("label", model.getValue().getLabel());
        return model;
    }
});
        
// Use getLabel in list (by default SimpleComboBox displayProperty "value" is used - calls enum toString)
String html = "<tpl for=\".\"><div role=\"listitem\" class=\"" + combo.getListStyle() + "-item\">{" + "label" + "}</div></tpl>";
combo.setTemplate(html);

Verbose, but not too tricky. Hope this helps someone do the same.