I have a tree-like model I'd like to show in an NSOutlineView using an NSTreeController.
I was able to set up the bindings and everything works fine as long as I use the NSTreeController's insert and remove functions to change my model tree. If I try to insert or remove from the model tree directly, in some cases the NSOutlineView isn't updating.
If I insert an object into an expanded group of objects, it works:
But if I try to add the first object to a node, that had no children before, nothing happens. The disclosure triangle isn't appearing, so I can't expand it to see the new node.
If I hover over that node with a new object, it is expanded and I can add the second child with no problems. But the triangle is still invisible:
Finally if I close the parent of all these nodes and open them again (triggering a reload) the triangle suddenly appears:
That's why I was wondering if I had to manually reload the NSOutlineView's rows to make the triangle visible, or if I'm messing up something? Thanks!!
UPDATE:
In my Node class I add a new child like this:
- (void)addChild:(MyNode *)child {
[self willChangeValueForKey:@"childNodes"];
[children addObject:child];
[self didChangeValueForKey:@"childNodes"];
}
And I implemented these too (which I set in IB for my NSTreeController):
- (NSArray *)childNodes {
return [NSArray arrayWithArray:children];
}
- (NSInteger)countOfChildNodes {
return [children count];
}
- (BOOL)nodeIsLeaf {
return [children count] < 1;
}
I know that this (especially childNodes) aren't very optimized, but I'm only experimenting at the moment as in the final version my children will be stored in a C array.
UPDATE 2:
I also tried sending KVO notifications for the other 2 properties too, but that didn't help either.
- (void)addChild:(MyNode *)child {
NSLog(@"%@", NSStringFromSelector(_cmd));
[self willChangeValueForKey:@"nodeIsLeaf"];
[self willChangeValueForKey:@"countOfChildNodes"];
[self willChangeValueForKey:@"childNodes"];
[children addObject:child];
[self didChangeValueForKey:@"childNodes"];
[self didChangeValueForKey:@"countOfChildNodes"];
[self didChangeValueForKey:@"nodeIsLeaf"];
}
