[news.eclipse.platform] Re: enabledWhen for handlers and editors

[Karl Koster <klkoster@xxxxxxxxxxxxx>]

This is the contents of the expression definitions extension point:

There are property testers for the properties org.kdr.isNew, 
org.kdr.isDirty, and org.kdr.isAllowed.

The org.kdr.isDirty simply examines the isDirty method of the 
IEditorPart. org.kdr.isNew examines the model contained by the 
associated IEditorPart.getEditorInput() which all have the method 
isNew(). org.kdr.isAllowed checks permissions for the specific operation 
(the first parameter) for the given object (the object contained in the 
<with> tag or the class evaluated from the second parameter). If the 
<with> tag is an ISelection or a collection and does not have an 
<iterate> tag, it is iterated by the property tester and every object's 
permission is checked. If not object is supplied by <with> the second 
parameter is used to determine the class of the object and used to check 
permissions (e.g. used for an add operation).


   <extension
         point="org.eclipse.core.expressions.definitions">
      <definition
            id="org.kdr.risk.definition.portfolio.view">
         <and>
            <with
                  variable="activeContexts">
               <iterate
                     ifEmpty="false"
                     operator="or">
                  <or>
                     <equals
                           value="org.kdr.risk.context.portfolio">
                     </equals>
                  </or>
               </iterate>
            </with>
            <with
                  variable="activePartId">
               <equals
                     value="view.portfolio">
               </equals>
            </with>
         </and>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.editor">
         <and>
            <with
                  variable="activeContexts">
               <iterate
                     ifEmpty="false"
                     operator="or">
                  <or>
                     <equals
                           value="org.kdr.risk.context.portfolio">
                     </equals>
                  </or>
               </iterate>
            </with>
            <with
                  variable="activeEditorId">
               <equals
                     value="editor.portfolio">
               </equals>
            </with>
         </and>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.editor.focus">
         <and>
            <with
                  variable="activeContexts">
               <iterate
                     ifEmpty="false"
                     operator="or">
                  <or>
                     <equals
                           value="org.kdr.risk.context.portfolio">
                     </equals>
                  </or>
               </iterate>
            </with>
            <with
                  variable="activePartId">
               <equals
                     value="editor.portfolio">
               </equals>
            </with>
         </and>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.not.new">
         <with
               variable="activeEditor">
            <test
                  property="org.kdr.isNew"
                  value="false">
            </test>
         </with>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.dirty">
         <with
               variable="activeEditor">
            <test
                  property="org.kdr.isDirty"
                  value="true">
            </test>
         </with>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.selected">
         <with
               variable="selection">
            <and>
               <count
                     value="+">
               </count>
               <iterate>
                  <or>
                     <instanceof
                           value="org.kdr.portfolio.Portfolio">
                     </instanceof>
                  </or>
               </it0erate>
            </and>
         </with>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.security.add">
         <with
               variable="selection">
            <and>
               <test
                     args="add,org.kdr.portfolio.Portfolio"
                     property="org.kdr.isAllowed"
                     value="true">
               </test>
            </and>
         </with>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.security.change">
         <with
               variable="selection">
            <iterate>
               <and>
                  <test
                        args="change"
                        property="org.kdr.isAllowed"
                        value="true">
                  </test>
               </and>
            </iterate>
         </with>
      </definition>
      <definition
            id="org.kdr.risk.definition.portfolio.security.delete">
         <or>
            <with
                  variable="selection">
               <iterate>
                  <and>
                     <test
                           args="remove"
                           property="org.kdr.isAllowed"
                           value="true">
                     </test>
                  </and>
               </iterate>
            </with>
            <and>
               <reference

definitionId="org.kdr.risk.definition.portfolio.editor">
               </reference>
               <with
                     variable="activeEditor">
                  <test
                        args="remove,org.kdr.portfolio.Portfolio"
                        property="org.kdr.isAllowed"
                        value="true">
                  </test>
               </with>
            </and>
         </or>
      </definition>
   </extension>

Paul Webster wrote:
> What do the expression definitions look like?  The variables used in the 
> definition (in <with/> elements) will determine when the expressions get 
> re-evaluated.
>
> are you using property testers?
>
> PW
> >