X-Git-Url: https://git.yukkurigames.com/?p=enjoyable.git;a=blobdiff_plain;f=Categories%2FNSMutableArray%2BMoveObject.m;h=6c7987e252b8c20f176a655f4e8e99e5d705ed96;hp=8d9a4ee6978e927c5ca9e42375720f7871de4d30;hb=a7260fe79808efcad6a92cace15a1b3429f14787;hpb=f0ee56026ad07a45722350d091f632a52a506486

diff --git a/Categories/NSMutableArray+MoveObject.m b/Categories/NSMutableArray+MoveObject.m
index 8d9a4ee..6c7987e 100644
--- a/Categories/NSMutableArray+MoveObject.m
+++ b/Categories/NSMutableArray+MoveObject.m
@@ -16,4 +16,34 @@
     [self insertObject:obj atIndex:dst > src ? dst - 1 : dst];
 }
 
+- (BOOL)moveFirstwards:(id)object upTo:(NSUInteger)minIndex {
+    NSUInteger idx = [self indexOfObject:object];
+    if (idx > minIndex && idx != NSNotFound) {
+        [self exchangeObjectAtIndex:idx withObjectAtIndex:idx - 1];
+        return YES;
+    } else {
+        return NO;
+    }
+}
+
+- (BOOL)moveLastwards:(id)object upTo:(NSUInteger)maxIndex {
+    maxIndex = MIN(self.count - 1, maxIndex);
+    NSUInteger idx = [self indexOfObject:object];
+    if (idx < maxIndex && idx != NSNotFound) {
+        [self exchangeObjectAtIndex:idx withObjectAtIndex:idx + 1];
+        return YES;
+    } else {
+        return NO;
+    }
+}
+
+- (BOOL)moveFirstwards:(id)object {
+    return [self moveFirstwards:object upTo:0];
+}
+
+- (BOOL)moveLastwards:(id)object {
+    return [self moveLastwards:object upTo:NSNotFound];
+}
+
+
 @end