Re: Select model objects with NSTableView using cocoa bindings
Re: Select model objects with NSTableView using cocoa bindings
- Subject: Re: Select model objects with NSTableView using cocoa bindings
- From: Luc Van Bogaert <email@hidden>
- Date: Thu, 13 Oct 2011 22:44:03 +0200
On 12 Oct 2011, at 23:22, Quincey Morris wrote:
> On Oct 12, 2011, at 13:31 , Luc Van Bogaert wrote:
>
>> I'm wondering if I should create a NSIndexSet property in my model object and bind it to the NSArrayController's 'selectedIndexes' key?
>
> Yes, but you've got the terminology wrong. The relevant concept here is a binding name, and it's "selectionIndexes", not "selectedIndexes". NSArrayController also has a "selectionIndexes" property, but that's what the table view binds to, and is not involved here (except as an "intermediary" property between the table view and the data model -- which is why a NSArrayController is a "mediating" controller.) Also, binding actually goes in the other direction -- you bind the object with the binding (the array controller) to the object with the property (the model). But I'm pretty sure that's what you meant. :)
>
Thanks, I got this working in one 'direction', ie. when the selection in the table is changed, this is reflected in my UI and the 'selected' Dot objects are drawn in a different color. For this, I decided to use a NSMutableIndexSet 'dotSelectionIndexes' property in my model object, bound to the array controller's 'selectionIndexes' binding.
But I'm afraid this still remains a little blurry on how to get the binding work in the other direction. Meaning, I would like to click a Dot object in my UI to select it, and this should change the selection in the table, resulting in turn in the Dot being redrawn with a different color.
I was hoping that by just adding or replacing the contents of my 'dotSelectionIndexes' ivar (hence the choice for a NSMutableIndexSet) with the index of the clicked Dot, would trigger a selection change in the table because of the binding. It seems this doesn't work. So, obviously I'm still missing something.
--
Luc.
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