gwt - How to add a generic "All" value in GXT ComboBox -


i have generic gxt3 combobox display available values enums :

public static <t extends enum<t>> combobox<t> buildenumcombo(class<t> t){    liststore<t> liststore=new liststore<t>(new enummodelkeyprovider<t>());    for(t e:t.getenumconstants()){     liststore.add(e);   }    combobox<t> combo= new combobox<t>(liststore, new enumlabelprovider<t>());   combo.settriggeraction(comboboxcell.triggeraction.all);    return combo; }

this combo works fine.

what need : able add "all" value.

i tried add "null" in store , customize labelprovider display "all" particular case not work expected : combo contains expected line displays empty text instead of "all" , line not have correct size.

here generic modelkeyprovider enums

public class enummodelkeyprovider<t extends enum> implements modelkeyprovider<t> {  @override public string getkey(t item) {   if(item==null){     return null;   }else{     return item.name();   } }

and generic labelprovider : 

public class enumlabelprovider<t extends enum<t>> implements labelprovider<t> {    @override   public string getlabel(t item) {     if(item==null){       return "all";     }else{       return i18nenum.i18nenum(item);     }   } }

maybe not solution looking for, solved setting emptytext of combobox "all".


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