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From a command handler how can I know if it is invoked? [message #660927]

Tue, 22 March 2011 11:53

David Pérez

Messages: 228
Registered: July 2009

Senior Member

I need to know from a command handler if it is invoked from the keyboard or other means (menu item, mouse, ....).

Why?

Because if it is invoked from the keyboard, which control has the focus matters.

Example:

I have a view with a table and a text field for searching inside the table.

Suppose that Ctrl+C is the shorcut for the command that copies the contents of the current row in the table to the clipboard.

If I select this command from a toolbar, focus doesn't matter.
But if I press Ctrl+C, I would like the behaviour to be adjusted:
- If the text field has the focus
- Or some other control like the table has the focus

I've checked HandlerUtil but haven't seen anything useful.

Any idea?

David

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Re: From a command handler how can I know if it is invoked? [message #661103 is a reply to message #660927]

Wed, 23 March 2011 08:18

Prakash G.R.

Messages: 621
Registered: July 2009

Senior Member

On 22/03/11 5:23 PM, David PÃ©rez wrote:
> I need to know from a command handler if it is invoked from the keyboard
> or other means (menu item, mouse, ....).

The ExecutionEvent passed to the handler has the getTrigger() method.
You can examine it to get the details you want.

--
- Prakash
Platform UI Team, IBM

www.eclipse-tips.com

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Re: From a command handler how can I know if it is invoked? [message #661206 is a reply to message #661103]

Wed, 23 March 2011 15:17

David Pérez

Messages: 228
Registered: July 2009

Senior Member

Thanks Prakash.
Commands are powerful.
Without your help, it would have been hard to discover this by myself, as it isn't very documented.

David

Prakash G.R. wrote on Wed, 23 March 2011 04:18

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Re: From a command handler how can I know if it is invoked? [message #661424 is a reply to message #661103]

Thu, 24 March 2011 15:37

David Pérez

Messages: 228
Registered: July 2009

Senior Member

Hi Prakash,

I would consider adding this method in HanderUtil:

    public static boolean isFromKeyboard(ExecutionEve nt e) {
        Object trig = e.getTrigger();
        if (trig instanceof Event) {
            Event ev = (Event) trig;
            return ev.type == SWT.KeyDown || ev.type == SWT.KeyUp || ev.type == SWT.HardKeyDown || ev.type == SWT.HardKeyUp;
        }
        return false;
    }

What do you think?

BTW, your tips from your blog are really very valuable. Razz

Prakash G.R. wrote on Wed, 23 March 2011 04:18

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Re: From a command handler how can I know if it is invoked? [message #661521 is a reply to message #661424]

Fri, 25 March 2011 04:55

Prakash G.R.

Messages: 621
Registered: July 2009

Senior Member

On 24/03/11 9:07 PM, David PÃ©rez wrote:
> Hi Prakash,
>
> I would consider adding this method in HanderUtil:
>
> public static boolean isFromKeyboard(ExecutionEve nt e) {
> Object trig = e.getTrigger();
> if (trig instanceof Event) {
> Event ev = (Event) trig;
> return ev.type == SWT.KeyDown ||
> ev.type == SWT.KeyUp || ev.type == SWT.HardKeyDown
> || ev.type == SWT.HardKeyUp;
> }
> return false;
> }
>
> What do you think?

Please raise a bug. We can discuss there: http://bit.ly/NewBugInPlatformUI

--
- Prakash
Platform UI Team, IBM

www.eclipse-tips.com

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