add RATreeView as source

doric-iOS/Devkit/Classes/RATreeView/RATreeNode.m

@@ -0,0 +1,75 @@
+
+//The MIT License (MIT)
+//
+//Copyright (c) 2014 Rafał Augustyniak
+//
+//Permission is hereby granted, free of charge, to any person obtaining a copy of
+//this software and associated documentation files (the "Software"), to deal in
+//the Software without restriction, including without limitation the rights to
+//use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+//the Software, and to permit persons to whom the Software is furnished to do so,
+//subject to the following conditions:
+//
+//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+//FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+//COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+//IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+//CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+
+#import "RATreeNode.h"
+
+#import "RATreeNodeItem.h"
+
+
+@interface RATreeNode () {
+  BOOL _expanded;
+}
+
+@property (nonatomic) BOOL expanded;
+@property (nonatomic, strong) RATreeNodeItem *lazyItem;
+@property (nonatomic, copy) BOOL (^expandedBlock)(id);
+
+@end
+
+
+@implementation RATreeNode
+
+- (id)initWithLazyItem:(RATreeNodeItem *)item expandedBlock:(BOOL (^)(id))expandedBlock;
+{
+  self = [super init];
+  if (self) {
+    _lazyItem = item;
+    _expandedBlock = expandedBlock;
+  }
+  
+  return self;
+}
+
+
+#pragma mark -
+
+- (RATreeNodeItem *)item
+{
+  return self.lazyItem.item;
+}
+
+- (BOOL)expanded
+{
+  if (self.expandedBlock) {
+    _expanded = self.expandedBlock(self.item);
+    self.expandedBlock = nil;
+  }
+  
+  return _expanded;
+}
+
+- (void)setExpanded:(BOOL)expanded
+{
+  self.expandedBlock = nil;
+  _expanded = expanded;
+}
+
+@end