Re: NSButtonCell visibility binding in NSOutlineView
Re: NSButtonCell visibility binding in NSOutlineView
- Subject: Re: NSButtonCell visibility binding in NSOutlineView
- From: Chris Tracewell <email@hidden>
- Date: Wed, 29 Apr 2009 09:46:13 -0700
On Apr 29, 2009, at 8:13 AM, Ashley Clark wrote:
On Apr 28, 2009, at 12:12 PM, Chris Tracewell wrote:
I am looking for the best method of turning off the visibility of
an NSButtonCell object for individual rows in an OutlineView/
TableView. I have an OutlineView that is bound to a TreeController.
There are two columns. In the last column I am using a checkbox
cell that should only be visible to the user when a
representedObject in the TreeController has a certain property
value. There is no Visibility binding only Enabled which does not
hide the control but just dims it.
I am using bindings to return a custom image for setImage and
setAlternateImage to display a custom NSImage instead of the
regular checkbox. It works nicely. I tried using conditional logic
to return a transparent image when I want to hide the control but
that affects the entire column. If I need to subclass I am
suspecting I need to override NSTableColumn's dataCellForRow, but
then how do I obtain the representedObject for that row?
Why not just implement -
outlineView:willDisplayCell:forTableColumn:item: on your delegate
and then set your images there depending on what item is about to be
displayed?
Ashley
I tried that by setting the image but I need 3 states for the checkbox
- OFF, ON, HIDDEN. Whenever I set a certain row to a HIDDEN image to
hide that row it would affect the image for all other items too. So it
looked like I would need to subclass, however I found the solution and
just posted about it before your email came in...
-(NSCell *)outlineView:(NSOutlineView *)outlineView
dataCellForTableColumn:(NSTableColumn *)tableColumn item:(id)item
Thanks
Chris
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