On Tue, Apr 28, 2009 at 1:12 PM, Chris Tracewell <ch...@thinkcl.com> 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.
Hm. I'm conflicted as to whether or not from a usability standpoint
you should prefer to display a disabled cell or none at all.
NSTableView has a -tableView:dataCellForTableColumn:row: delegate
method, so you don't need to subclass NSTableColumn. Perhaps the
better approach is to subclass NSButtonCell and implement
-drawWithFrame:inView: somewhat like this:
-(void)drawWithFrame:(NSRect)frame inView:(NSView *)view {
if([self shouldDisplayCheckboxForObject:[self objectValue]])
[super drawWithFrame:frame inView:view];
}
Then, of course, you need to implement
-shouldDisplayCheckboxForObject, set an instance of this cell as the
cell for your table column, and bind the column to your model objects
instead of an attribute thereof.
--Kyle Sluder
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