CODEWITHSUNDEEP
objective-ccocoa-bindingsnsoutlineviewnstreecontroller
user2985886
user2985886

Reputation: 1

NStreeController - NSoutlineView get cell binding object

I have the following scenario in a NSoutlineView:

ParentObject            [checkbox]
  - ChildObject 1       [checkbox]
  - ChildObject 2       [checkbox]

Each checkbox has a binding set up to a bool value of the respective object in a NSTreeController. When a user selects the parentObject checkbox, the respective children checkboxes should also be set. However, when a child object checkbox is set, the parent checkbox should not be affected. I cannot seem to get the parent functionality working properly.

My current attempted solution to the problem is: when the checkbox is set call:

-(IBAction)CheckSelected:(NSButtonCell *)sender 
 {
     // Somehow access the cells bound object in the NSTreeController ?????
 }

However from my research I have not been able to find a way to get access to the cell's respective object in the NSTreeController.

Any insight on the problem would be greatly appreciated. I feel like this is a common problem that people would run into using an NStreeController and I am curious if I am taking the proper approach.

Thanks :)

Upvotes: 0

Views: 346

Answers (1)

Wil Shipley
Wil Shipley

Reputation: 9553

The checkboxes shouldn’t be set up to call an action—they should be bound to a property, like, say, “isChecked”.

In your ParentObject you’ll have code similar to:

- (void)setIsChecked:(BOOL)isChecked;
{
    _isChecked = isChecked;
    for (ChildObject *childObject in self.children)
        childObject.isChecked = isChecked;
}

Since the children’s checkboxes are also bound, the children’s new state will be reflected in the outline view immediately.

Upvotes: 1

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