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how bind commands to buttons with enabled state [message #645894]

Tue, 21 December 2010 00:59

Thomas F

Messages: 7
Registered: December 2010

Junior Member

Hi,

I've got the issue to add buttons in views - not just in toolbars, but e.g. next to input fields... Those buttons might be enabled if any input is given or not... In traditional programming I would enable/disable the buttons out of listeners of other fields. Currently I use properties like "isMyButtonEnabled" which return the value via getIsMyButtonEnabled(). If I do any changes I fire a prop change and the binding of button.enabled to this property does the update automatically. The action listeners of button perform the exectuable. Not fairly nice but works.

Nevertheless there is RCP and a framework with commands. I found how to execute commands out of buttons. BUT how to bind the enabled or visible state of a button to the command handler. For toolbar contributions e.g. the button becomes disabled if the handler is deactivated (activeWhen) or invisible (visibleWhen). How can I do this with traditional SWT buttons? And maybe how can I do this using WindowBuilder ?

Thx

Thomas

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Re: how bind commands to buttons with enabled state [message #645905 is a reply to message #645894]

Tue, 21 December 2010 06:23

Prakash G.R.

Messages: 621
Registered: July 2009

Senior Member

On 21/12/10 6:29 AM, Thomas F wrote:
> I've got the issue to add buttons in views - not just in toolbars, but
> e.g. next to input fields... Those buttons might be enabled if any input
> is given or not... In traditional programming I would enable/disable the
> buttons out of listeners of other fields. Currently I use properties
> like "isMyButtonEnabled" which return the value via
> getIsMyButtonEnabled(). If I do any changes I fire a prop change and the
> binding of button.enabled to this property does the update
> automatically. The action listeners of button perform the exectuable.
> Not fairly nice but works.
>
> Nevertheless there is RCP and a framework with commands. I found how to
> execute commands out of buttons. BUT how to bind the enabled or visible
> state of a button to the command handler. For toolbar contributions e.g.
> the button becomes disabled if the handler is deactivated (activeWhen)
> or invisible (visibleWhen). How can I do this with traditional SWT
> buttons? And maybe how can I do this using WindowBuilder ?

You can use property testers/contexts in the visibleWhen & enabledWhen
elements in the plugin.xml and then update the visibility/enablement of
a contribution.

Commands are more of a metadata. They suit well when you need to
abstract the actual work from the representation (think of Copy/Paste
and how the implementations will be differ in various views & editor,
yet its presented as the same operation to the user) If you all need is
a button to be visible and enabled in a view/form, then you could
consider doing it without commands.

--
- Prakash
Platform UI Team, IBM

www.eclipse-tips.com

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Re: how bind commands to buttons with enabled state [message #645990 is a reply to message #645894]

Tue, 21 December 2010 13:45

Davy Meers

Messages: 2
Registered: December 2010

Junior Member

As Prakash stated, there is no need to use commands.

The jface databinding framework is better suited for what you want to achieve.

Have a look at the jface data binding framework.

The following tutorial might give you a head start:

http://community.jboss.org/wiki/Eclipsewizardswithjfacedatab indinginDeltacloudTools1

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