Implementing A Static NSOutlineView
- by spamguy
I'm having a hard time scraping together enough snippets of knowledge to implement an NSOutlineView with a static, never-changing structure defined in an NSArray. This link has been great, but it's not helping me grasp submenus. I'm thinking they're just nested NSArrays, but I have no clear idea.
Let's say we have an NSArray inside an NSArray, defined as
NSArray *subarray = [[NSArray alloc] initWithObjects:@"2.1", @"2.2", @"2.3", @"2.4", @"2.5", nil];
NSArray *ovStructure = [[NSArray alloc] initWithObjects:@"1", subarray, @"3", nil];
The text is defined in outlineView:objectValueForTableColumn:byItem:.
- (id)outlineView:(NSOutlineView *)ov objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)ovItem
{
if ([[[tableColumn headerCell] stringValue] compare:@"Key"] == NSOrderedSame)
{
// Return the key for this item. First, get the parent array or dictionary.
// If the parent is nil, then that must be root, so we'll get the root
// dictionary.
id parentObject = [ov parentForItem:ovItem] ? [ov parentForItem:ovItem] : ovStructure;
if ([parentObject isKindOfClass:[NSArray class]])
{
// Arrays don't have keys (usually), so we have to use a name
// based on the index of the object.
NSLog([NSString stringWithFormat:@"%@", ovItem]);
//return [NSString stringWithFormat:@"Item %d", [parentObject indexOfObject:ovItem]];
return (NSString *) [ovStructure objectAtIndex:[ovStructure indexOfObject:ovItem]];
}
}
else
{
// Return the value for the key. If this is a string, just return that.
if ([ovItem isKindOfClass:[NSString class]])
{
return ovItem;
}
else if ([ovItem isKindOfClass:[NSDictionary class]])
{
return [NSString stringWithFormat:@"%d items", [ovItem count]];
}
else if ([ovItem isKindOfClass:[NSArray class]])
{
return [NSString stringWithFormat:@"%d items", [ovItem count]];
}
}
return nil;
}
The result is '1', '(' (expandable), and '3'. NSLog shows the array starting with '(', hence the second item. Expanding it causes a crash due to going 'beyond bounds.' I tried using parentForItem: but couldn't figure out what to compare the result to.
What am I missing?
