On Jun 10, 2010, at 9:43 AM, Michael Hanna wrote:
> OK I'm really stumped on this one. I want to make a checkbox with a
> NSTextFieldCell combined together. It's important that the checkbox
> goes ON if the mouse hits the box, NOT the text. I've accomplished
> this, more or less, but the issue is receiving the mouse event because
> I click one checkbox in a row, but ALL of them turn to NSOnState. I
> will show what I've done and my various failed attempts in order to
> get this to work.
>
> So this is how I've done it so far:
>
> header:
> @interface MyCheckboxCellToo : NSTextFieldCell {
> NSButtonCell *_checkboxCell;
> }
>
> implementation:
<snip>
You're missing an implementation of copyWithZone that copies the _checkboxCell
ivar.
Hence, all use the same instance and show the same stuff. You'll also
eventually get a crash because the default implementation of copyWithZone is
just a bitwise copy of the class.
corbin
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