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

Tue, 22 March 2011 07:53

Eclipse User

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

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 04:18

Eclipse User

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

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 11:17

Eclipse User

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

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 11:37

Eclipse User

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

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 00:55

Eclipse User

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

Re: From a command handler how can I know if it is invoked? [message #661923 is a reply to message #661424]

Mon, 28 March 2011 10:18

Eclipse User

If you have a view and your handling of a command (like copy) changes
depending on which control has focus, use the IFocusService. That
allows you to specify a different handler when your text widget has
focus (as opposed to using your view's normal handler when anything else
has focus, for example).

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Platform_Expression_Framework
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse. platform.doc.isv/guide/workbench.htm

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