• Clarify workaround for Apple Bug 7827354, which is closed as a duplicate of 3404770.

Author: jerrykrinock

SSYArrayController.h

@@ -110,7 +110,7 @@
  
  SELECTION METHODS
  
- Provides -selectFirstArranged, -hasSelection.
+ Provides -selectFirstArranged
  
  TABLE FONT SIZE
  

SSYMoreObserveableArrayController.h

@@ -6,9 +6,12 @@
  @brief    Workaround for Apple Bug ID 7827354, which was closed as a duplicate
  of 3404770, in NSArrayController
  
- @details  Provides a -hasSelection property which actually works.
+ @details  Provides two properties for observing content.  However,
+ even these don't work if you stick them into +keyPathsForValuesAffecting<Key>.
+ You must observe them directly.
  */
 
-@property (assign, readonly) BOOL hasSelection ;
+@property (readonly) BOOL hasSelection ;
+@property (readonly) NSInteger countOfArrangedObjects ;
 
 @end

SSYMoreObserveableArrayController.m

@@ -3,6 +3,7 @@
 @interface SSYMoreObserveableArrayController ()
 
 @property (assign) BOOL hasSelection ;
+@property (assign) NSInteger countOfArrangedObjects ;
 
 @end
 
@@ -28,16 +29,18 @@ - (void)awakeFromNib {
     [self addObserver:self
            forKeyPath:@"selectedObjects"
               options:0
-              context:NULL] ;
+              context:[self class]] ;
 }
 
 - (void)observeValueForKeyPath:(NSString *)keyPath
                       ofObject:(id)object
                         change:(NSDictionary *)change
                        context:(void *)context {
-    if ([keyPath isEqualToString:@"selectedObjects"]) {
+    if ((context == [self class]) && [keyPath isEqualToString:@"selectedObjects"]) {
         NSInteger selectionCount = [[self selectedObjects] count] ;
-        [self setHasSelection:(selectionCount > 0)] ;
+        BOOL hasSelection = (selectionCount > 0) ;
+        self.hasSelection = hasSelection ;
+        /*SSYDBL*/ NSLog(@"   set hasSelection to %hhd", self.hasSelection) ;
     }
 
     [super observeValueForKeyPath:keyPath
@@ -46,4 +49,11 @@ - (void)observeValueForKeyPath:(NSString *)keyPath
                           context:context] ;
 }
 
+- (void)rearrangeObjects {
+    [super rearrangeObjects] ;
+    
+    self.countOfArrangedObjects = ((NSArray*)self.arrangedObjects).count ;
+    /*SSYDBL*/ NSLog(@"   set countOfArrangedObjects to %ld", self.countOfArrangedObjects) ;
+}
+
 @end