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[news.eclipse.platform.ua] Re: Enabling commands for particular file types only
Cross posting to eclipse.platform where you are more likely to find someone who is an expert on commands.

Patrick Könemann wrote: 
Dear newsgroup,

I am not really sure whether this is the right newsgroup to ask, please tell me then whether there is a more appropriate one.

When defining actions in Eclipse, you can enable them only for particular file types in the extension definition (e.g. nameFilter="*.txt" in the objectContribution).
Following the command framework [1], restrictions can be modeled in the activeWhen clause of the handler, however, I cannot figure out how to restrict the handler to particular file types only.

I could not find any documentation for doing that.
Here is my extension so far:

   <extension
         point="org.eclipse.ui.handlers">
      <handler
            class="mypackage.MyHandler"
            commandId="myCommand">
         <activeWhen>
            <with
                  variable="selection">
               <iterate
                     operator="and">
                  <instanceof
                        value="org.eclipse.core.resources.IFile">
                  </instanceof>
[I guess the file type restriction has to go here]
               </iterate>
            </with>
         </activeWhen>
      </handler>
   </extension>


Any help appreciated.

Best regards
Patrick


[1] http://wiki.eclipse.org/Platform_Command_Framework