両端が選択されている時に左右矢印で選択を変更できるようにした

diff --git a/KCD/HMCollectionView.m b/KCD/HMCollectionView.m
index 524c486..3b7af00 100644 (file)
--- a/KCD/HMCollectionView.m
+++ b/KCD/HMCollectionView.m
@@ -73,7 +73,37 @@
     NSString *key = event.charactersIgnoringModifiers;
     if([key isEqualToString:@" "]) {
         [self quickLookWithEvent:event];
+        
+        return;
+    }
+    // 左右矢印キーの時の動作
+    const NSUInteger leftArrow = 123;
+    const NSUInteger rightArrow = 124;
+    if(event.keyCode == leftArrow || event.keyCode == rightArrow) {
+        NSSet *se = self.selectionIndexPaths;
+        if(se.count == 0) return;
+        NSIndexPath *indexPath = se.allObjects[0];
+        NSInteger index = indexPath.item;
+        
+        if(event.keyCode == leftArrow) {
+            if(index == 0) return;
+            index -= 1;
+        } else {
+            NSUInteger count = self.content.count;
+            if(index == count - 1) return;
+            index += 1;
+        }
+        
+        NSRect frame = [self frameForItemAtIndex:index];
+        [self scrollRectToVisible:frame];
+        
+        NSUInteger i[] = { 0, index };
+        NSIndexPath *newIndexPath = [NSIndexPath indexPathWithIndexes:i length:2];
+        self.selectionIndexPaths = [NSSet setWithObject:newIndexPath];
+        
+        return;
     }
+    
     [super keyDown:event];
 }