Lazy Notification and Command Undo/Redo

Question

I have a two-part CS3 plug-in (model and UI).<br /><br />When I click on one of the checkboxes in the UI, it causes a command to be executed that highlights certain fields in the document and sets a persistent boolean indicating the state of the higlighting.<br /><br />I want to be able to uncheck the checkbox when an Edit > Undo is done using lazy notification, but I've been working on this for a few days now and I can't get it to work.<br /><br />I've made the following changes to the model plug-in code:<br /><br />1. In the .fr file, I added this:<br />AddIn<br />{<br />     kDocWorkspaceBoss,<br />     kInvalidClass,<br />     {<br />          // Interface to the persistent prefs implementation<br />          IID_IVIPREFERENCES, kVIPrefsImpl,<br />               <br />          // Interface to the Toggle Highlighting command<br />          IID_IVIHIGHLIGHTCHANGE, kVISetHighlightDisplayedCmdImpl,<br />     }<br />},<br /><br />2. In the command's DoNotify method, I do a ModelChange call with an 'interestedIn' parameter of IID_IVIHIGHLIGHTCHANGE. I've tried invoking this method on various subjects, e.g., document subject, document workspace subject, document preferences subject (i.e., getting my persistent interface on the workspace and then getting an ISubject interface on it), all to no apparent avail.<br /><br />I've made the following changes to the UI plug-in code:<br /><br />1. In the .fr file, I added this:<br /><br />AddIn<br />{<br />     kDocWorkspaceBoss,<br />     kInvalidClass,<br />     {<br />          // Interface to the preference change observer<br />          IID_IPREFSOBSERVER, kVIPUIPrefsObserverImpl,<br />     }<br />},<br /><br />2. In the preference change observer's AutoAttach method, I do the following (with error checking removed here for clarity). I've tried various subjects besides the document workspace subject here as well...<br /><br />InterfacePtr<IActiveContext><br />    ac(gSession->GetActiveContext(), UseDefaultIID());<br />IDocument *doc = ac->GetContextDocument();<br />InterfacePtr<ISubject> subject(doc->GetDocWorkSpace(), UseDefaultIID());<br /><br />if (!subject->IsAttached(ISubject::kLazyAttachment, this,<br />    IID_IVIHIGHLIGHTCHANGE, IID_IPREFSOBSERVER)<br />) {<br />    subject->AttachObserver(ISubject::kLazyAttachment, this,<br />        IID_IVIHIGHLIGHTCHANGE, IID_IPREFSOBSERVER);<br />}<br /><br />I've implemented a LazyUpdate method in the preference change observer, but it never gets called -- not when the checkbox is checked, and not when an Undo or Redo is done. I've verified that the observer's AutoAttach method is getting called, and that the ModelChange method inside the command's DoNotify method is being called.<br /><br />Has anyone gotten lazy notification on command undo/redo to work? If so, can you tell me what I might be doing wrong?

Answer 1

Don't post the same question repeatedly. I've removed the thread you started 4 days after this one with the identical same question.
db