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enabling menu items dynamically [message #466606]

Sun, 22 April 2007 15:53

Eclipse User

Originally posted by: mash_909.yahoo.co.uk

I have what I would think is a fairly standard use case.
I would like menu and toolbar items to become enabled / disabled in
response to user selections (ie in a TreeViewer).

I Googled round but could find nothing specific on this. The best way I
could think of doing it was to make my ActionBarAdvisor subclass
implement ISelectionListener. The logic being that the ActionBarAdvisor
subclass has references to all menu items and can therefore easily
enable/disable them with calls to setEnabled(boolean).

This works but it seems like the wrong way to do this. Is there a
better way of doing this?

thanks
Matt

Re: enabling menu items dynamically [message #466774 is a reply to message #466606]

Tue, 24 April 2007 14:08

Eclipse User

Matt Hegarty wrote:
> I have what I would think is a fairly standard use case.
> I would like menu and toolbar items to become enabled / disabled in
> response to user selections (ie in a TreeViewer).

Actions provided through XML (actionSets, editorActions, viewActions,
popupMenus) and command handlers provided through
org.eclipse.ui.handlers have XML ways to specify their enablement,
almost always tied to the current selection. They are also implemented
as a flavour of IActionDelegate, and so can update their enablement in
their selectionChanged(*) method.

If you are contributing a JFace Action, you have to update the action
enabled state yourself (using a combination of a selection listener and
IAction#setEnabled(*)).

PW

Re: enabling menu items dynamically [message #466979 is a reply to message #466774]

Thu, 26 April 2007 16:41

Eclipse User

Originally posted by: mash_909.yahoo.co.uk

Thanks - this makes much more sense.

Paul Webster wrote:
> Matt Hegarty wrote:
>> I have what I would think is a fairly standard use case.
>> I would like menu and toolbar items to become enabled / disabled in
>> response to user selections (ie in a TreeViewer).
>
> Actions provided through XML (actionSets, editorActions, viewActions,
> popupMenus) and command handlers provided through
> org.eclipse.ui.handlers have XML ways to specify their enablement,
> almost always tied to the current selection. They are also implemented
> as a flavour of IActionDelegate, and so can update their enablement in
> their selectionChanged(*) method.
>
> If you are contributing a JFace Action, you have to update the action
> enabled state yourself (using a combination of a selection listener and
> IAction#setEnabled(*)).
>
> PW

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