Managed preferences warning banner for Mac preferences dialog

chrome/browser/cocoa/infobar_gradient_view.mm

 // Copyright (c) 2009 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.
 
 #include "chrome/browser/cocoa/infobar_gradient_view.h"
 
+#include "base/scoped_nsobject.h"
 #import "chrome/browser/browser_theme_provider.h"
 #import "chrome/browser/cocoa/themed_window.h"
 
+namespace {
+
 const double kBackgroundColorTop[3] =
     {255.0 / 255.0, 242.0 / 255.0, 183.0 / 255.0};
 const double kBackgroundColorBottom[3] =
     {250.0 / 255.0, 230.0 / 255.0, 145.0 / 255.0};
+}
 
 @implementation InfoBarGradientView
 
 - (id)initWithFrame:(NSRect)frameRect {
   if ((self = [super initWithFrame:frameRect])) {
     NSColor* startingColor =
         [NSColor colorWithCalibratedRed:kBackgroundColorTop[0]
                                   green:kBackgroundColorTop[1]
                                    blue:kBackgroundColorTop[2]
                                   alpha:1.0];
     NSColor* endingColor =
         [NSColor colorWithCalibratedRed:kBackgroundColorBottom[0]
                                   green:kBackgroundColorBottom[1]
                                    blue:kBackgroundColorBottom[2]
                                   alpha:1.0];
-    gradient_ =
+    scoped_nsobject<NSGradient> gradient(
         [[NSGradient alloc] initWithStartingColor:startingColor
-                                       endingColor:endingColor];
+                                       endingColor:endingColor]);
+    [self setGradient:gradient];
   }
   return self;
 }
 
-- (void)dealloc {
-  [gradient_ release];
-  [super dealloc];
-}
-
-- (void)setGradient:(NSGradient*)gradient {
-  [gradient retain];
-  [gradient_ release];
-  gradient_ = gradient;
-}
-
 - (NSColor*)strokeColor {
   ThemeProvider* themeProvider = [[self window] themeProvider];
   if (!themeProvider)
     return [NSColor blackColor];
 
   BOOL active = [[self window] isMainWindow];
   return themeProvider->GetNSColor(
       active ? BrowserThemeProvider::COLOR_TOOLBAR_STROKE :
                BrowserThemeProvider::COLOR_TOOLBAR_STROKE_INACTIVE,
       true);
 }
 
-- (void)drawRect:(NSRect)rect {
-  [gradient_ drawInRect:[self bounds] angle:270];
-
-  // Draw bottom stroke
-  [[self strokeColor] set];
-  NSRect borderRect, contentRect;
-  NSDivideRect([self bounds], &borderRect, &contentRect, 1, NSMinYEdge);
-  NSRectFillUsingOperation(borderRect, NSCompositeSourceOver);
-}
-
 - (BOOL)mouseDownCanMoveWindow {
   return NO;
 }
 
 // This view is intentionally not opaque because it overlaps with the findbar.
 
 - (BOOL)accessibilityIsIgnored {
   return NO;
 }
 
 - (id)accessibilityAttributeValue:(NSString*)attribute {
   if ([attribute isEqual:NSAccessibilityRoleAttribute])
     return NSAccessibilityGroupRole;
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 @end