Respond to modifier key press in Preference Pane

I've been trying to get my NSPreferencePane to change the text on a
button in response to the user pressing the option key. From my
understanding of the documentation, the best way to do this in
Cocoa is to implement the

- (void)flagsChanged:(NSEvent *)theEvent

method of the relevant responder. I've added this method to my
NSPreferencePane subclass, set the Custom Class of my nib file
to my subclass, and wired the delegate of the Pref Pane window
to the File's Owner of that nib.

Stil, my flagsChanged method doesn't get called (as tested by
NSLog call amongst other things).

Any other suggestions for getting my PrefPane to respond to the
Option key? This idea is that if the user holds option, the
function of a button in the pane changes. The text on the
button should dynamically update and the action of the button
should pick up the modifier key press.

Surely I don't have to subclass NSWindow as well, set the NIB's
window to that subclass and implement the function in there?

--
*--------------------------------------------------------*
| ^Nothing is foolproof to a sufficiently talented fool^ |
| Heath Raftery, HRSoftWorks _\|/_ |
*______________________________________m_('.')_m_________*

Heath Raftery wrote:

> I've been trying to get my NSPreferencePane to change the text on a
> button in response to the user pressing the option key. From my
> understanding of the documentation, the best way to do this in
> Cocoa is to implement the
>
> - (void)flagsChanged:(NSEvent *)theEvent
>
> method of the relevant responder. I've added this method to my
> NSPreferencePane subclass, set the Custom Class of my nib file
> to my subclass, and wired the delegate of the Pref Pane window
> to the File's Owner of that nib.
>
> Stil, my flagsChanged method doesn't get called (as tested by
> NSLog call amongst other things).

The thing to remember about pref panes is that the 'window' that
contains your UI in the nib won't be shown in the System Preferences
application. Instead its content (view?) will be displayed in the System
Preferences app's window. You might try:

1) creating a custom view implementing flagsChanged: and set that as
your nib window's content view. (you can do this in IB).

2) making your NSPreferencePane subclass a delegate of the System
Preferences window at runtime. Try 'mainViewDidLoad' or 'didSelect'.

Not sure which approach works (best) so you'll have to experiment a bit.

patrick