Rework how bookmark bar folder menus and submenus are layed out when scrollin...

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_window.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/bookmarks/bookmark_bar_folder_window.h"
 
 #import "base/logging.h"
-#include "app/mac/nsimage_cache.h"
 #import "base/scoped_nsobject.h"
+#import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_constants.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.h"
 #import "chrome/browser/ui/cocoa/image_utils.h"
 #import "third_party/GTM/AppKit/GTMNSColor+Luminance.h"
 #import "third_party/GTM/AppKit/GTMNSBezierPath+RoundRect.h"
 
+using bookmarks::kBookmarkBarMenuCornerRadius;
 
 @implementation BookmarkBarFolderWindow
 
 - (id)initWithContentRect:(NSRect)contentRect
                 styleMask:(NSUInteger)windowStyle
                   backing:(NSBackingStoreType)bufferingType
                     defer:(BOOL)deferCreation {
   if ((self = [super initWithContentRect:contentRect
                                styleMask:NSBorderlessWindowMask // override
                                  backing:bufferingType
                                    defer:deferCreation])) {
     [self setBackgroundColor:[NSColor clearColor]];
     [self setOpaque:NO];
   }
   return self;
 }
 
 @end
 
 
-namespace {
-// Corner radius for our bookmark bar folder window.
-// Copied from bubble_view.mm.
-const CGFloat kViewCornerRadius = 4.0;
-}
-
 @implementation BookmarkBarFolderWindowContentView
 
-- (void)awakeFromNib {
-  arrowUpImage_.reset(
-      [app::mac::GetCachedImageWithName(@"menu_overflow_up.pdf") retain]);
-  arrowDownImage_.reset(
-      [app::mac::GetCachedImageWithName(@"menu_overflow_down.pdf") retain]);
-}
-
-// Draw the arrows at the top and bottom of the folder window as a
-// visual indication that scrolling is possible.  We always draw the
-// scrolling arrows; when not relevant (e.g. when not scrollable), the
-// scroll view overlaps the window and the arrows aren't visible.
-- (void)drawScrollArrows:(NSRect)rect {
-  NSRect visibleRect = [self bounds];
-
-  // On top
-  NSRect imageRect = NSZeroRect;
-  imageRect.size = [arrowUpImage_ size];
-  NSRect drawRect = NSOffsetRect(
-      imageRect,
-      (NSWidth(visibleRect) - NSWidth(imageRect)) / 2,
-      NSHeight(visibleRect) - NSHeight(imageRect));
-  [arrowUpImage_ drawInRect:drawRect
-                   fromRect:imageRect
-                  operation:NSCompositeSourceOver
-                   fraction:1.0
-               neverFlipped:YES];
-
-  // On bottom
-  imageRect = NSZeroRect;
-  imageRect.size = [arrowDownImage_ size];
-  drawRect = NSOffsetRect(imageRect,
-                          (NSWidth(visibleRect) - NSWidth(imageRect)) / 2,
-                          0);
-  [arrowDownImage_ drawInRect:drawRect
-                     fromRect:imageRect
-                    operation:NSCompositeSourceOver
-                     fraction:1.0
-                 neverFlipped:YES];
-}
-
 - (void)drawRect:(NSRect)rect {
-  NSRect bounds = [self bounds];
   // Like NSMenus, only the bottom corners are rounded.
   NSBezierPath* bezier =
-      [NSBezierPath gtm_bezierPathWithRoundRect:bounds
-                            topLeftCornerRadius:0
-                           topRightCornerRadius:0
-                         bottomLeftCornerRadius:kViewCornerRadius
-                        bottomRightCornerRadius:kViewCornerRadius];
-  [bezier closePath];
-
-  // TODO(jrg): share code with info_bubble_view.mm?  Or bubble_view.mm?
-  NSColor* base_color = [NSColor colorWithCalibratedWhite:0.5 alpha:1.0];
-  NSColor* startColor =
-      [base_color gtm_colorAdjustedFor:GTMColorationLightHighlight
-                                 faded:YES];
+      [NSBezierPath gtm_bezierPathWithRoundRect:[self bounds]
+                            topLeftCornerRadius:kBookmarkBarMenuCornerRadius
+                           topRightCornerRadius:kBookmarkBarMenuCornerRadius
+                         bottomLeftCornerRadius:kBookmarkBarMenuCornerRadius
+                        bottomRightCornerRadius:kBookmarkBarMenuCornerRadius];
+  NSColor* startColor = [NSColor colorWithCalibratedWhite:0.91 alpha:1.0];
   NSColor* midColor =
-      [base_color gtm_colorAdjustedFor:GTMColorationLightMidtone
-                                 faded:YES];
+      [startColor gtm_colorAdjustedFor:GTMColorationLightMidtone faded:YES];
   NSColor* endColor =
-      [base_color gtm_colorAdjustedFor:GTMColorationLightShadow
-                                 faded:YES];
-  NSColor* glowColor =
-      [base_color gtm_colorAdjustedFor:GTMColorationLightPenumbra
-                                 faded:YES];
+      [startColor gtm_colorAdjustedFor:GTMColorationLightPenumbra faded:YES];
 
   scoped_nsobject<NSGradient> gradient(
     [[NSGradient alloc] initWithColorsAndLocations:startColor, 0.0,
                         midColor, 0.25,
                         endColor, 0.5,
-                        glowColor, 0.75,
+                        midColor, 0.75,
+                        startColor, 1.0,
                         nil]);
   [gradient drawInBezierPath:bezier angle:0.0];
-
-  [self drawScrollArrows:rect];
 }
 
 @end
 
 
 @implementation BookmarkBarFolderWindowScrollView
 
 // We want "draw background" of the NSScrollView in the xib to be NOT
 // checked.  That allows us to round the bottom corners of the folder
 // window.  However that also allows some scrollWheel: events to leak
 // into the NSWindow behind it (even in a different application).
 // Better to plug the scroll leak than to round corners for M5.
 - (void)scrollWheel:(NSEvent *)theEvent {
   DCHECK([[[self window] windowController]
            respondsToSelector:@selector(scrollWheel:)]);
   [[[self window] windowController] scrollWheel:theEvent];
 }
 
 @end