Re: Why does my menu have mutually exclusive states?
Re: Why does my menu have mutually exclusive states?
- Subject: Re: Why does my menu have mutually exclusive states?
- From: Peter Ammon <email@hidden>
- Date: Fri, 15 Jan 2010 11:50:37 -0800
On Jan 15, 2010, at 11:41 AM, Eric Gorr wrote:
> I have some sample code at:
>
> http://ericgorr.net/cocoadev/UtilityMenu.zip
>
> According to the documentation in "Application Menu and Pop-up List Programming Topics for Cocoa", to get mutually exclusive states, one my manage this oneself:
>
>
>
> You can use states to implement a group of mutually exclusive menu items, much like a group of radio buttons. For example, a game could have three menu items to show the level of play: Beginner, Intermediate, and Advanced. To implement a such a group, create one action message that they all use. This action message changes the appropriate setting, and then reflects that change by unchecking the currently checked item and checking the newly selected item.
> In an action method that responds to all commands in the group use setState: to uncheck the menu item that is currently marked:
> [curItem setState:NSOffState];
> Then mark the newly selected command:
> [sender setState:NSOnState];
>
>
>
> However, when my menu item is selected, I just turn it's state on and do nothing else (for now).
>
> Why is the state of the previously selected items being set to off?
Hi Eric,
Your menu is in an NSPopUpButtonCell, and by default popups set the state of the selected item, and clear the state of other items. You can disable this behavior by calling [cell setAltersStateOfSelectedItem:NO] on the popup button cell.
-Peter
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