gistfile1.txt

package com.google.gwt.user.client.ui;

/**
 * Simple panel that wraps a GWT simple panel to be replaced by the widgetToAttach we set while updating the references.
 * <p/>
 * The result of this will be to have a better, cleaner, dom.
 */
public class ReplacePanel implements IsWidget, HasOneWidget {
    private IsWidget widget;

    public ReplacePanel() {
        this.widget = new com.google.gwt.user.client.ui.SimplePanel();
    }

    @Override
    public Widget asWidget() {
        return widget.asWidget();
    }

    @Override
    public Widget getWidget() {
        return widget.asWidget();
    }

    @Override
    public void setWidget(Widget widgetToAttach) {
        Widget parentAsWidget = widget.asWidget().getParent();

        if (parentAsWidget != null && parentAsWidget instanceof HTMLPanel) {
            HTMLPanel parent = (HTMLPanel) parentAsWidget;

            parent.addAndReplaceElement(widgetToAttach, widget.asWidget().getElement());

            widget = widgetToAttach;
        }
    }

    @Override
    public void setWidget(IsWidget widget) {
        setWidget(widget.asWidget());
    }
}