isEnabled on AjaxSelfUpdatingTimerBehavior.

[Graeme Knight <gr...@gmail.com>]

Hi.

I have looked at removing the timer from a component when a condition is not
true, but according to the forums this is not possible. 

Recommended is the use of isEnabled. I have the following code, but
isEnabled doesn't appear to be working. 

I'm after a way of allowing a user to start a process by pressing a link,
then as the process continues over several minutes the WebMarkupContainer is
updated (every 5 seconds using an AjaxSelfUpdatingTimerBehavior) and when
the process finishes, stopping the timerbahavior until the link is next
pressed. I think this must be a common thing to do so any information would
be most welcome.

My refresh link that the user presses to render an indicator and a
percentage based on the fact a refresh is occuring:

public final class RefreshLink extends AbstractAjaxFallbackButtonLink
{
    private static final long serialVersionUID = 1825145981122180572L;

    @Override
    public void onClick( AjaxRequestTarget target )
    {
        // create the refresh process worker
        RefreshWorker refreshWorker = new RefreshWorker();

        // execute the refresh thread
        refreshWorker.refresh( Visit.get() );
        
        // get the page
        AccountViewPage page = AccountViewPage.class.cast( getPage() );

        // get a reference to the markup container component containing a
refresh indicator and percentage complete
        Component container = page.get( RefreshPanel.CONTAINER_ID_PATH );
        
        target.addComponent( container );        
    }
}

In the panel containing the indicator (shown as the process continues along
with a percentage complete):

                      :
        WebMarkupContainer container = new WebMarkupContainer( CONTAINER );

        Image refreshIndicator = new Image( REFRESH_INDICATOR,
IconFactory.getSmallGIF( REFRESH_INDICATOR ) );

        AttributeModifier attributeModifier = new
RefreshImageAttributeModifier();

        Label percentageCompleteLabel = new Label(
PERCENTAGE_COMPLETE_LABEL, new RefreshLabelReadOnlyModel() );

        container.add( percentageLabel );
        container.add( refreshIndicator );
        container.add( attributeModifier );

        container.setOutputMarkupId( true );

        container.add( new RefreshTimerBehavior() );

        add( refreshButton );
        add( container );
                             :

And the refresh timer:

public final class RefreshTimerBehavior extends
AjaxSelfUpdatingTimerBehavior
{
    private static final long serialVersionUID = -6061033495202259806L;

    private static final int FIVE_SECONDS = 5;

    /**
     * @param updateInterval
     */
    public RefreshTimerBehavior()
    {
        super( Duration.seconds( FIVE_SECONDS ) );
    }

    /*
     * (non-Javadoc)
     * 
     * @see
org.apache.wicket.behavior.AbstractBehavior#isEnabled(org.apache.wicket.Component)
     */
    @Override
    public boolean isEnabled( Component component )
    {
        boolean isEnabled = false;

        if( Visit.get().isRefreshing() )
        {
            isEnabled = true;
        }

        return isEnabled;
    }
}

Now, isEnabled is getting called, but the base class method onTimer is also
getting called - indicating to me that the value of isEnabled is being
ignored - I was hoping that a return value of false would tell the timer to
stop, but it keeps ticking away every five seconds. I obviously can't remove
the timer behavior but I would like to disable and enable it in the
following conditions:

     1) Enable: The timer gets enabled (i.e. isEnabled is true?) on
Visit.get().isRefreshing() equal to 'true'.

     2) Disable: The timer gets disabled (i.e. isEnabled is false?) on
Visit.get().isRefreshing() equal to 'false'.

I simply only want the timer to tick when the refreshing process via the
worker is occuring and not otherwise.

I hope this is clear... Any thoughts? This is with 1.3.5 Wicket.

Many thanks for your time, Graeme.
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