Question

When an instance of my portlet is going to be removed from a page, I want to capture that event to get some preference values from that portlet, and to do something.

Is there anything like interfaces or hooks to do that in Liferay?

Answer 1

You can define your own PortletLayoutListener in liferay-portlet.xml:

<portlet>
        <portlet-name>xxyyzz</portlet-name>
...
        <portlet-layout-listener-class>com.myCompany.MyLayoutTypePortletListener</portlet-layout-listener-class>
...
</portlet>

And your MyLayoutTypePortletListener may be similar to:

public class MyLayoutTypePortletListener
    implements PortletLayoutListener {

    public void onRemoveFromLayout(String portletId, long plid)
        throws PortletLayoutListenerException {
        // ***** ... your LOGIC HERE *****
    }

    public void onMoveInLayout(String portletId, long plid)
        throws PortletLayoutListenerException {

    }

    public void onAddToLayout(String portletId, long plid)
        throws PortletLayoutListenerException {
    }

}

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See the journal content portlet for an example and that Liferay’s Forum Post.