ToggleComponent.java

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package com.sun.faces.test.servlet30.dynamic;

import javax.faces.component.FacesComponent;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PreRenderViewEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;

@FacesComponent(value = "com.sun.faces.test.servlet30.dynamic.ToggleComponent")
public class ToggleComponent extends UIComponentBase implements SystemEventListener {

    public ToggleComponent() {
        setRendererType("component");
        FacesContext context = FacesContext.getCurrentInstance();
        UIViewRoot root = context.getViewRoot();
        root.subscribeToViewEvent(PreRenderViewEvent.class, this);
    }

    @Override
    public String getFamily() {
        return "com.sun.faces.test.servlet30.dynamic";
    }

    public boolean isListenerForSource(Object source) {
        return (source instanceof UIViewRoot);
    }

    @Override
    public void processEvent(SystemEvent event) throws AbortProcessingException {
        UIComponent component = getChildren().remove(0);
        getChildren().add(component);
    }
}