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Using Tapestry 2.2
I have a component (Misko's TreeComponent actually) that I am attempting to
add a parameter to. Not to hard methinks. Well, perhaps I should think again!
(no fault of Misko's might I add)
The problem is that the listener I am adding is NEVER set.
The tree component is used like this:
<component id="sourceProperties" type="Tree:Tree">
<binding name="tree" expression='propertiesModel'/>
<binding name="treeEventListener"
expression='components.propertiesEditor'/>
</component>
components.propertiesEditor implements the listener interface, the idea being
that as I click and use the tree, the other thing recieves the events and
"does stuff". The fault is that no listener instance is EVER set in the tree
itself.
I've used a very basic implementation for the tree property, as follows:
<parameter
name="treeEventListener"
java-type="net.sf.tapestry.contrib.tree.ITreeEvents"
direction="in"
required="no">
<description>
<![CDATA[ open/click and close events can be sent to this
listener ]]>
</description>
</parameter>
With java code as follows:
/**
* Returns the treeEventsListener.
* @return ITreeEvents
*/
public ITreeEvents getTreeEventsListener() {
if (log.isDebugEnabled()) {
log.debug("Trying to return the tree events listener. The
member var is : "
+ treeEventsListener);
}
if (treeEventsListener == null) {
IBinding binding = getBinding("treeEventsListener");
if (log.isDebugEnabled()) {
log.debug("Member var is null, binding is " + binding);
}
if (binding != null) {
if(log.isDebugEnabled()) {
log.debug("The object in the binding is " +
binding.getObject());
}
return (ITreeEvents) binding.getObject();
}
}
return treeEventsListener;
}
/**
* Sets the treeEventsListener.
* @param treeEventsListener The treeEventsListener to set
*/
public void setTreeEventsListener(ITreeEvents treeEventsListener) {
if (log.isDebugEnabled()) {
log.debug("Setting the tree events listener to " +
treeEventsListener);
}
this.treeEventsListener = treeEventsListener;
}
The output when I perform an action on the tree is:
[exec] 22:16:59,498 DEBUG [net.sf.tapestry.contrib.tree.TreeComponent]
Trying to return the tree events listener. The member var is : null
[exec] 22:16:59,499 DEBUG [net.sf.tapestry.contrib.tree.TreeComponent]
Member var is null, binding is null
[exec] 22:16:59,499 DEBUG [net.sf.tapestry.contrib.tree.TreeComponent]
Not calling tree event listener because it is not set
Looks like there's NO binding at all.
WEEEIRD.
What have I done wrong?
I've been staring at this for quite a while now. Time for bed!
- --
Regards,
Neil Clayton
(PS: If you see strange text you don't understand underneath my email, don't
worry - it's just my PGP signature)
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