XTF factories

Factory interface

[scriptable, uuid(27c10dca-2efc-416b-ae36-9794380a661e)]
interface nsIXTFElementFactory : nsISupports
{
  nsIXTFElement createElement(in AString tagName);
};

Sample implementation in JS module:

//----------------------------------------------------------------------
// xtfShapesFactory

const XTF_SHAPE_FACTORY_CID = Components.ID("{42575fd0-256d-42e5-abe7-cc0b9464503f}");
const XTF_SHAPE_FACTORY_PROGID = "@mozilla.org/xtf/element-factory;1?namespace=urn:mozilla:xtf:tests:shapes";

function xtfShapeFactory() { }

xtfShapeFactory.prototype = {
    // nsISupports implementation:
    QueryInterface: function (iid) {
      if (!iid.equals(Components.interfaces.nsIXTFElementFactory) &&
          !iid.equals(Components.interfaces.nsISupports)) {
        throw Components.results.NS_ERROR_NO_INTERFACE;
      }
      return this;
    },

    // nsIXTFElementFactory implementation:
    createElement: function (tagName) {
      if (tagName=="canvas")
        return new xtfCanvas();
      if (tagName=="shape")
        return new xtfShape();
      else if (tagName=="smiley")
        return new xtfSmiley();
      else
        throw Components.results.NS_ERROR_FAILURE;
    }
};