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Enabling/Disabling a command [message #559076]

Wed, 15 September 2010 14:17

Giddi Ohm

Messages: 10
Registered: September 2010

Junior Member

I'm new to SWT so please bare with me.

How do I disable a command based on a state in my program? I have PLAY command which puts my application in a play-state after the command has been confirmed by the user. I've created a STOP command and put it on a toolbar and assigned a handler to it, but the isEnabled() method isn't called often enough.

The STOP command's isEnabled() method is invoked immediately before and after the dialog is shown (most likely a result of the application window losing and gaining focus), but not after my code has regained control. Hence the stop button is never enabled.

I want to achieve something like this in my PLAY handler:
//state == IDLE;
if(openQuestion(...))
{
setState(PLAYING);
// somehow enable the STOP command
}

I have looked at the command service class but there seems to be no method of triggering an enable-evaluation of all commands. I've tried with and without enabledWhen to no avail.

I have no problems doing this with actions or action delegates, but I want to learn how to use commands from the beginning even though the framework seems overly complex for standard applications.

Please advice.

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