Storing expanded state part I

baRSS/NewsController.m

@@ -32,6 +32,7 @@
 @property (weak) IBOutlet NSMenuItem *openUnreadItem;
 
 @property (strong) NSArray<NSTreeNode*> *currentlyDraggedNodes;
+@property (strong) NSMutableSet<NSIndexPath*> *expandedItems;
 @end
 
 @implementation NewsController
@@ -41,11 +42,41 @@ static NSString *dragNodeType = @"baRSS-feed-type";
 
 - (void)awakeFromNib {
     [super awakeFromNib];
+	self.expandedItems = [NSMutableSet set];
+	NSArray *storedExpansions = [[NSUserDefaults standardUserDefaults] arrayForKey:@"pups"];
+	NSLog(@"%lu", storedExpansions.count);
+	for (NSString *str in storedExpansions) {
+		if (str.length == 0)
+			continue;
+		NSIndexPath *path = [NSIndexPath new];
+		for (NSString *idx in [str componentsSeparatedByString:@","]) {
+			path = [path indexPathByAddingIndex:(NSUInteger)[idx integerValue]];
+		}
+		NSLog(@"%@", path);
+	}
+	NSLog(@"%@", self.arrangedObjects.childNodes);
+//	[self.expandedItems bind:NSContentArrayBinding toObject:[NSUserDefaultsController sharedUserDefaultsController] withKeyPath:@"values.pups" options:nil];
+//	[self.expandedItems addObject:[self indexPathToString:[NSIndexPath indexPathWithIndex:4]]];
+//	self.expandedItems = [NSMutableSet set];
+//	[self.expandedItems bind:@"values" toObject:[NSUserDefaults standardUserDefaults]
+//	   withKeyPath:@"extensio" options:@{ NSContinuouslyUpdatesValueBindingOption : @YES,
+//										  NSRaisesForNotApplicableKeysBindingOption : @YES
+//										  }];
+//	[self.expandedItems addObject:[NSIndexPath indexPathWithIndex:4]];
+	
+	
+	
 	// Set the outline view to accept the custom drag type AbstractTreeNodeType...
 	[self.outlineView registerForDraggedTypes:[NSArray arrayWithObject:dragNodeType]];
 	[self setSortDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"sortIndex" ascending:YES]]];
 }
 
+
+- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {
+	// this delegate method is only here to set owner to null and prohibit repeated awakeFromNib calls
+	return [self.outlineView makeViewWithIdentifier:tableColumn.identifier owner:nil];
+}
+
 - (IBAction)pauseUpdates:(NSMenuItem *)sender {
 	NSLog(@"pause");
 }
@@ -149,6 +180,67 @@ static NSString *dragNodeType = @"baRSS-feed-type";
 	}
 }
 
+- (NSString*)indexPathToString:(NSIndexPath*)path {
+	NSMutableString *mStr = [NSMutableString string];
+	for (NSUInteger i = 0;  i < path.length; i++) {
+		[mStr appendFormat:@",%lu", [path indexAtPosition:i]];
+	}
+	if (mStr.length < 1) return mStr;
+	return [mStr substringFromIndex:1];
+}
+
+- (NSArray*)indexPathToNumberArray:(NSIndexPath*)path {
+	NSUInteger *idcs = malloc(sizeof(NSUInteger) * path.length);
+	[path getIndexes:idcs];
+	NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:path.length];
+	for (NSUInteger i = 0; i < path.length; i++) {
+		[arr addObject:[NSNumber numberWithUnsignedInteger:[path indexAtPosition:i]]];
+	}
+	free(idcs);
+	return arr;
+}
+
+- (id)outlineView:(NSOutlineView *)outlineView itemForPersistentObject:(id)object {
+	NSIndexPath *path = [NSIndexPath new];
+	for (NSNumber *num in object) {
+		path = [path indexPathByAddingIndex:[num unsignedIntegerValue]];
+	}
+	NSLog(@"%@", [self arrangedObjects]);
+	[((AppDelegate*)[NSApp delegate]) persistentContainer];
+	NSTreeNode *node = [[self arrangedObjects] descendantNodeAtIndexPath:path];
+	return node;
+}
+
+- (id)outlineView:(NSOutlineView *)outlineView persistentObjectForItem:(id)item {
+	NSUInteger len = [item indexPath].length;
+	NSUInteger *idcs = malloc(sizeof(NSUInteger) * len);
+	[[item indexPath] getIndexes:idcs];
+	NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:len];
+	for (NSUInteger i = 0; i < len; i++) {
+		[arr addObject:[NSNumber numberWithUnsignedInteger:[[item indexPath] indexAtPosition:i]]];
+	}
+	free(idcs);
+	return arr;
+}
+
+#pragma mark - Store and reload exanded items
+
+- (void)loadExpandedItems {
+	
+}
+
+- (BOOL)outlineView:(NSOutlineView *)outlineView shouldExpandItem:(id)item {
+	[self.expandedItems addObject:[item indexPath]];
+	return YES;
+}
+
+- (BOOL)outlineView:(NSOutlineView *)outlineView shouldCollapseItem:(id)item {
+	[self.expandedItems removeObject:[item indexPath]];
+//	[self.outlineView isExpandable:]
+//	[self.outlineView expandItem:]
+	return YES;
+}
+
 #pragma mark - Dragging Support, Data Source Delegate
 
 - (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard {