1 files changed, 63 insertions, 0 deletions
diff --git a/macosx/HBPictureViewController.m b/macosx/HBPictureViewController.m
new file mode 100644
index 000000000..3739cfc68
--- /dev/null
+++ b/macosx/HBPictureViewController.m
@@ -0,0 +1,63 @@
+//
+//  HBPictureViewController.m
+//  HandBrake
+//
+//  Created by Damiano Galassi on 24/07/15.
+//
+//
+
+#import "HBPictureViewController.h"
+#import "HBFilters.h"
+#import "HBPicture.h"
+
+static void *HBPictureViewControllerContext = &HBPictureViewControllerContext;
+
+@interface HBPictureViewController ()
+
+@property (weak) IBOutlet NSStepper *widthStepper;
+@property (weak) IBOutlet NSStepper *heightStepper;
+
+@end
+
+@implementation HBPictureViewController
+
+- (instancetype)init
+{
+    self = [super initWithNibName:@"HBPictureViewController" bundle:nil];
+    if (self)
+    {
+        [self addObserver:self forKeyPath:@"self.picture.modulus" options:NSKeyValueObservingOptionInitial context:HBPictureViewControllerContext];
+    }
+    return self;
+}
+
+- (void)dealloc
+{
+    @try
+    {
+        [self removeObserver:self forKeyPath:@"self.picture.modulus"];
+    }
+    @catch (NSException * __unused exception) {}
+}
+
+#pragma mark - KVO
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
+{
+    if (context == HBPictureViewControllerContext)
+    {
+        // Set the increment here, it's not possible with bidings.
+        if ([keyPath isEqualToString:@"self.picture.modulus"])
+        {
+            [self.widthStepper setIncrement:self.picture.modulus];
+            [self.heightStepper setIncrement:self.picture.modulus];
+        }
+    }
+    else
+    {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+    }
+}
+
+
+@end