source: Dev/trunk/src/client/dojox/treemap/GroupLabel.js

define(["dojo/_base/declare", "dojo/dom-construct", "dojo/dom-style"],
        function(declare, domConstruct, domStyle) {

        return declare("dojox.treemap.GroupLabel", null, {
                // summary:
                //              Specializes TreeMap to remove leaf labels and display group labels centered on group
                //              content instead of display them in headers.

                createRenderer: function(item, level, kind){
                        var renderer = this.inherited(arguments);
                        if(kind == "content" || kind == "leaf"){
                                var p = domConstruct.create("div");
                                domStyle.set(p, {
                                        "zIndex": 30,
                                        "position": "relative",
                                        "height": "100%",
                                        "textAlign": "center",
                                        "top": "50%",
                                        "marginTop": "-.5em"
                                });
                                domConstruct.place(p, renderer);
                        }
                        return renderer;
                },

                styleRenderer: function(renderer, item, level, kind){
                        switch(kind){
                                case "leaf":
                                        domStyle.set(renderer, "background", this.getColorForItem(item).toHex());
                                case "content":
                                        if(level == 0){
                                                renderer.firstChild.innerHTML = this.getLabelForItem(item);
                                        }else{
                                                renderer.firstChild.innerHTML = null;
                                        }
                                        break;
                                case "header":
                                        domStyle.set(renderer, "display", "none");
                        }
                }
        });
});