SavingNSSplitViewPosition

Here’s some simple code to save and restore the position of an NSSplitView (which unfortunately don’t save their position). You can call these from your window controller’s awakeFromNib/windowDidLoad and termination code.

@interface NSSplitView (Defaults)

- (void) saveLayoutWithName: (NSString *) defaultName;
- (void) loadLayoutWithName: (NSString *) defaultName;

@end

@implementation NSSplitView (Defaults)

- (void) saveLayoutWithName: (NSString *) defaultName
{
    NSMutableArray *rectstrs = [NSMutableArray array];
    for (NSView *view in self.subviews)
        [rectstrs addObject: NSStringFromRect(view.frame)];
    [[NSUserDefaults standardUserDefaults] setObject: rectstrs forKey: defaultName];
}

- (void) loadLayoutWithName: (NSString *) defaultName
{
    NSMutableArray *rectstrs = [[NSUserDefaults standardUserDefaults] objectForKey: defaultName];
    if (rectstrs == nil) return;

    for (NSView *view in self.subviews) {
        view.frame = NSRectFromString([rectstrs objectAtIndex:0]);
        [rectstrs removeObjectAtIndex:0];
    }
    
    [self adjustSubviews];
}

@end

Too much work to change, easier to rewrite. This also handles collapsed views:

This only sort of handles collapsed views. “Collapsed” state is different from just zero height (or width). In a freshly loaded layout with this code, no subview will report YES for -[splitView isSubviewCollapsed:subview].

@interface NSSplitView (CCDLayoutAdditions)

- (void)storeLayoutWithName: (NSString*)name;
- (void)loadLayoutWithName: (NSString*)name;

@end    

@implementation NSSplitView (CCDLayoutAdditions)

- (NSString*)ccd__keyForLayoutName: (NSString*)name
{
	return [NSString stringWithFormat: @"CCDNSSplitView Layout %@", name];
}

- (void)storeLayoutWithName: (NSString*)name
{
	NSString*		key = [self ccd__keyForLayoutName: name];
	NSMutableArray*	viewRects = [NSMutableArray array];
	NSEnumerator*	viewEnum = self subviews] objectEnumerator];
	[[NSView*			view;
	NSRect			frame;
	
	while( (view = [viewEnum nextObject]) != nil )
	{
		if( [self isSubviewCollapsed: view] )
			frame = NSZeroRect;
		else
			frame = [view frame];
			
		[viewRects addObject: NSStringFromRect( frame )];
	}
	
	[[NSUserDefaults standardUserDefaults] setObject: viewRects forKey: key];
}

- (void)loadLayoutWithName: (NSString*)name
{
	NSString*		key = [self ccd__keyForLayoutName: name];
	NSMutableArray*	viewRects = [[NSUserDefaults standardUserDefaults] objectForKey: key];
	NSArray*		views = [self subviews];
	int				i, count;
	NSRect			frame;
		
	count = MIN( [viewRects count], [views count] );
	
	for( i = 0; i < count; i++ )
	{
		frame = NSRectFromString( [viewRects objectAtIndex: i] );
		if( NSIsEmptyRect( frame ) )
		{
			frame = views objectAtIndex: i] frame];
			if( [self isVertical] )
				frame.size.width = 0;
			else
				frame.size.height = 0;
		}
			
		[[views objectAtIndex: i] setFrame: frame];
	}
}

@end

I’ve got code similar to ones above that set the position of a split view. Now this works fine for a normal split view, but for a split view inside another split view, this doesn’t work. Can anyone see why it might not work? I’ve tried using setNeedsDisplay: and adjustSubviews but neither worked. Thanks.

- (void)setPositionUsingAutosaveName:([[NSString *)name
{
	NSArray *s = [[NSUserDefaults standardUserDefaults] objectForKey:name];;
	if (s == nil || [s isKindOfClass:[NSArray class]] == NO)
		return;
	
	NSArray *subviews = [self subviews];
	int i;
	for (i=0; i<[subviews count] && i<[s count]; i++)
	{
		NSRect newRect = NSRectFromString([s objectAtIndex:i]);
		[[subviews objectAtIndex:i] setFrame:newRect];
	}
}

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