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Select command handler based on where it's triggered from? [message #337039]

Thu, 23 July 2009 00:07

Eric Jain

Messages: 266
Registered: July 2009

Senior Member

Can I assign a different handler to a command, depending on where it was
triggered from (e.g. from a specific toolbar icon vs from a menu item)?

I know how to override handlers when specific parts are in focus:

<handler class="test.FooHandler" commandId="testCommand">
<activeWhen>
<with variable="activePartId">
<equals value="testView"/>
</with>
</activeWhen>
</handler>

...but this approach has some limitations (for example I'd like to
override the org.eclipse.ui.newWizard command when a specific view is in
focus, but the default handler should be used when the command is
triggered via the top-level menu, even if the view is still active).

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Re: Select command handler based on where it's triggered from? [message #452927 is a reply to message #337039]

Sat, 01 August 2009 14:33

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

The short answer is no. The application state determines which handler is active. A command executed from a key, menu, or toolbar should work correctly based on the application context (not the placement of the command).

The only exception is context menus. When you open a context menu, activeMenu is a collection of string context menuIds. It would be possible to execute a different handler from a context menu. But that's about it.

PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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