How to add VLayout and HLayout subclass to Visual Builder component pallet?

[wil.pannell]

CODE shows simple subclasses that would allow for use of gwt-2.3 activities/places/history management within smartgwt. As I understand it, java classes cannot be added to the visual builder component pallet, but the following approach seemed to get close:

http://forums.smartclient.com/showth...nent+schema%22.

Is there a recommended approach to adding classes like these to the component pallet?

package com.smartgwt.client.widgets.layout;

import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.gwt.user.client.ui.IsWidget;

public class HSimpleLayoutPanel extends HLayout implements AcceptsOneWidget{

  @Override
  public void setWidget(IsWidget widget) {
    clear();
    addMember(asWidgetOrNull(widget));
  }
}

package com.smartgwt.client.widgets.layout;

import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.gwt.user.client.ui.IsWidget;

public class VSimpleLayoutPanel extends VLayout implements AcceptsOneWidget{
  @Override
  public void setWidget(IsWidget widget) {
    clear();
    addMember(asWidgetOrNull(widget));
  }
}

Edit: Instead of, clear(), in the above code use:

  for (Canvas child : getChildren())
    removeChild(child);

[Isomorphic]

This is completely supported for SmartClient. For SmartGWT, GWT technology introduces hurdles because of the lack of support for Java reflection - you cannot, for example, create a Java class based on an XML description in the palette file because there's no Class.forName(), class.newInstance() etc in GWT's subset of Java.

You can get around this by introducing a GWT compiler extension that introduces limited reflection capabilities, such that you end up with a JavaScript API that can be called to create GWT components with specific properties. This is on our roadmap and therefore a valid Feature Sponsorship if it's a key capability for you.

[wil.pannell]

Gotcha. As always, thanks for your thorough and authoritative reply.