[rAC] added popup highlighting

chrome/browser/ui/cocoa/autofill/autofill_pop_up_button.mm

+// Copyright (c) 2013 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/autofill/autofill_pop_up_button.h"
+
+#include <ApplicationServices/ApplicationServices.h>
+
+#include "base/mac/scoped_nsobject.h"
+#include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
+
+@implementation AutofillPopUpButton
+
++ (Class)cellClass {
+  return [AutofillPopUpCell class];
+}
+
+- (BOOL)invalid {
+  return [[self cell] invalid];
+}
+
+- (void)setInvalid:(BOOL)invalid {
+  [[self cell] setInvalid:invalid];
+}
+
+- (NSString*)fieldValue {
+  return [[self cell] fieldValue];
+}
+
+- (void)setFieldValue:(NSString*)fieldValue {
+  [[self cell] setFieldValue:fieldValue];
+}
+
+@end
+
+
+@implementation AutofillPopUpCell
+
+@synthesize invalid = invalid_;
+
+// Draw a bezel that's highlighted.
+- (void)drawBezelWithFrame:(NSRect)frame inView:(NSView*)controlView {
+  if (invalid_) {
+    CGContextRef context = static_cast<CGContextRef>(
+        [[NSGraphicsContext currentContext] graphicsPort]);
+
+    // Create a highlight-shaded bezel in a transparency layer.
+    CGContextBeginTransparencyLayerWithRect(context, NSRectToCGRect(frame), 0);
+    // 1. Draw bezel.
+    [super drawBezelWithFrame:frame inView:controlView];
+
+    // 2. Use that as stencil against solid color rect.
+    [[NSColor redColor] set];
+    NSRectFillUsingOperation(frame, NSCompositeSourceAtop);
+
+    // 3. Composite the solid color bezel and the actual bezel.
+    CGContextSetBlendMode(context, kCGBlendModePlusDarker);
+    [super drawBezelWithFrame:frame inView:controlView];
+    CGContextEndTransparencyLayer(context);
+  } else {
+    [super drawBezelWithFrame:frame inView:controlView];
+  }
+}
+
+- (NSString*)fieldValue {
+  return [self titleOfSelectedItem];
+}
+
+- (void)setFieldValue:(NSString*)fieldValue {
+  [self selectItemWithTitle:fieldValue];
+}
+
+@end