Reverse bookmark buttons and menus in RTL

chrome/browser/ui/cocoa/l10n_util.mm

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/l10n_util.h"
 
 #include "base/i18n/rtl.h"
+#include "base/mac/mac_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 
 namespace cocoa_l10n_util {
 
 NSInteger CompareFrameY(id view1, id view2, void* context) {
   CGFloat y1 = NSMinY([view1 frame]);
   CGFloat y2 = NSMinY([view2 frame]);
   if (y1 < y2)
@@ skipping 66 matching lines @@
 }
 
 const base::Feature kExperimentalMacRTL{"ExperimentalMacRTL",
                                         base::FEATURE_DISABLED_BY_DEFAULT};
 
 bool ShouldDoExperimentalRTLLayout() {
   return base::i18n::IsRTL() &&
          base::FeatureList::IsEnabled(kExperimentalMacRTL);
 }
 
+#if !defined(MAC_OS_X_VERSION_10_12) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
+NSCellImagePosition LeadingCellImagePosition() {
+  return ShouldDoExperimentalRTLLayout() ? NSImageRight : NSImageLeft;
+}
+NSCellImagePosition TrailingCellImagePosition() {
+  return ShouldDoExperimentalRTLLayout() ? NSImageLeft : NSImageRight;
+}
+#else
+NSCellImagePosition LeadingCellImagePosition() {
+  return NSImageLeading;
+}
+NSCellImagePosition TrailingCellImagePosition() {
+  return NSImageTrailing;
+}
+#endif  // MAC_OS_X_VERSION_10_12
+
+// Adapted from Apple's RTL docs (goo.gl/cBaFnT)
+NSImage* FlippedImage(NSImage* image) {
+  NSImage* existingImage = image;
+  NSSize existingSize = [existingImage size];
+  NSSize newSize = NSMakeSize(existingSize.width, existingSize.height);
+  NSImage* flippedImage = [[[NSImage alloc] initWithSize:newSize] autorelease];
+
+  [flippedImage lockFocus];
+  [[NSGraphicsContext currentContext]
+      setImageInterpolation:NSImageInterpolationHigh];
+
+  NSAffineTransform* transform = [NSAffineTransform transform];
+  [transform translateXBy:existingSize.width yBy:0];
+  [transform scaleXBy:-1 yBy:1];
+  [transform concat];
+
+  [existingImage drawAtPoint:NSZeroPoint
+                    fromRect:NSMakeRect(0, 0, newSize.width, newSize.height)
+                   operation:NSCompositeSourceOver
+                    fraction:1.0];
+
+  [flippedImage unlockFocus];
+
+  return flippedImage;
+}
+
 }  // namespace cocoa_l10n_util