I decompiled the class file for this tag (tomahawk v1.1.3) and found that
there are only two places where casting is done (don't know the line numbers
as it's decompiled code).
1. TabChangeListener listener =
(TabChangeListener)ClassUtils.newInstance(className);
2. ((HtmlPanelTabbedPane)component).addTabChangeListener(listener);
Clearly my tab listener won't result in a ClassCastException, because it
implements TabChangeListener, which leaves the HtmlPanelTabbedPane cast.
This doesn't appear possible either since the following code is being used:
<t:panelTabbedPane id="tabbedPane" width="650" serverSideTabSwitch="true"
selectedIndex="#{editProfileAction.selectedTab}" >
...
<t:tabChangeListener
type="com.nemoves.pipeline.util.EditUserRecordTabListener"/>
</t:panelTabbedPane>
monkeyden wrote:
>
> Thanks for the reply Jeff.
>
> I am currently trying this but getting a ClassCastException when the
> tabChangeListener tag is encountered. Does anyone know where I can find
> the source for tomahawk, so I can step through int he debugger? Only bin
> is available here: http://www.wmwweb.com/apache/myfaces/
> http://www.wmwweb.com/apache/myfaces/
>
> java.lang.ClassCastException: com.site.util.EditUserRecordTabListener
> at
> org.apache.myfaces.custom.tabbedpane.TabChangeListenerTag.doStartTag(TabChangeListenerTag.java:82)
>
> Here is the code:
>
> package com.site.util;
>
> import javax.faces.context.FacesContext;
> import javax.faces.el.ValueBinding;
> import javax.faces.event.AbortProcessingException;
>
> import org.apache.myfaces.custom.tabbedpane.TabChangeEvent;
> import org.apache.myfaces.custom.tabbedpane.TabChangeListener;
>
> import com.site.actions.EditUserRecordAction;
>
> public class EditUserRecordTabListener implements TabChangeListener {
>
> public void processTabChange(TabChangeEvent event) throws
> AbortProcessingException {
> int newIndex = event.getNewTabIndex();
> int oldIndex = event.getNewTabIndex();
> EditUserRecordAction action =
> (EditUserRecordAction)getManagedBean("editProfileAction");
> action.setSelectedTab(newIndex);
> }
>
> public static Object getManagedBean(String ref) {
> // Find or create the web-tier data object
> // ref like "#{myBean}"
> FacesContext context = FacesContext.getCurrentInstance();
> ValueBinding binding =
> context.getApplication().createValueBinding(ref);
> Object result = binding.getValue(context);
> return result;
> }
>
> }
>
>
> Jeff Bischoff wrote:
>>
>> Monkeyden,
>>
>> See [1]. This is from the front page of the wiki.
>>
>> Alternatively, all managed beans can be accessed directly from the
>> appropriate scope (i.e. request, session).
>>
>> I found the following utility method (based on the wiki page) useful in
>> my application:
>>
>> /**
>> * Look up a managed bean by JSP-EL value-binding expression
>> * @param ref a value-binding expression to lookup
>> * @return the managed bean referenced by the expression
>> */
>> public static Object getManagedBean(String ref) {
>> // Find or create the web-tier data object
>> // ref like "#{myBean}"
>> FacesContext context = FacesContext.getCurrentInstance();
>> ValueBinding binding = context.getApplication().createValueBinding(ref);
>> return binding.getValue(context);
>> }
>>
>> [1] http://wiki.apache.org/myfaces/AccessingOneManagedBeanFromAnother
>>
>> Regards,
>>
>> Jeff Bischoff
>> Kenneth L Kurz & Associates, Inc.
>>
>> monkeyden wrote:
>>> Im using a Tomahawk tabbedPane in my JSP
>>>
>>> <t:panelTabbedPane id="tabbedPane" bgcolor="#ffffff" width="650"
>>> serverSideTabSwitch="true" selectedIndex="#{myBackingBean.selectedTab}">
>>>
>>> I want to implement a TabChangeListener, to set the "selectedTab" value
>>> of
>>> the backing bean. I don't need to change the view of the component at
>>> all,
>>> since that's handled automatically. I just need to know what the
>>> currently
>>> selected tab is. Looking at the hierarchy, there doesn't seem to be a
>>> way
>>> to get my backing bean instance from session to set the value. This is
>>> how
>>> I would expect this to be done. Please tell me if I'm way off base or
>>> not.
>>>
>>> processTabChange(TabChangeEvent tabChangeEvent){
>>> MyBackingBean myBean = [get the bean somehow];
>>> myBean.setSelectedTab(tabChangeEvent.getNewTabIndex());
>>> }
>>
>>
>>
>>
>
>
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