[news.eclipse.platform] Re: ActionSet visibility

[Paul Webster <pwebster@xxxxxxxxxx>]

reindheer wrote:
> But when the user selects th perspective when he is not connected to a database, all the views are empty. Now i want the db actions except connect to be disabled. We initially thought of using an Action registry to enable\disable actions. 

With no action registry, some of the other options available are:
1) have your IActionDelegates check for DB connection on every 
selectionChange(*) call to have them enabled when connected

2) move your DB-connect actions into a different action set, and use 
IWorkbenchPage show and hide action set methods to make them show up 
when your DB is connected.  This will make them appear/disappear

3) if using commands/handlers, you can write a property tester applied 
to the current selection to check if your DB is connected ... that can 
then be used in org.eclipse.ui.handlers - activeWhen/enabledWhen to 
enable/disable the commands or in org.eclipse.ui.menus - visibleWhen to 
make them appear/disappear.

Later,
PW

--
Paul Webster
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