[Mac] Disable menu certain menu items when a modal dialog or sheet is present.

chrome/browser/cocoa/bookmark_menu_cocoa_controller.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/cocoa/bookmark_menu_cocoa_controller.h"
+
 #include "app/text_elider.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/app/chrome_dll_resource.h"  // IDC_BOOKMARK_MENU
+#import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser.h"
 #import "chrome/browser/cocoa/bookmark_menu_bridge.h"
-#import "chrome/browser/cocoa/bookmark_menu_cocoa_controller.h"
 #include "chrome/browser/cocoa/event_utils.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "webkit/glue/window_open_disposition.h"
 
 namespace {
 
 // Menus more than this many pixels wide will get trimmed
 // TODO(jrg): ask UI dudes what a good value is.
 const NSUInteger kMaximumMenuPixelsWide = 300;
@@ skipping 25 matching lines @@
 
 - (void)dealloc {
   [[self menu] setDelegate:nil];
   [super dealloc];
 }
 
 - (NSMenu*)menu {
   return [[[NSApp mainMenu] itemWithTag:IDC_BOOKMARK_MENU] submenu];
 }
 
+- (BOOL)validateMenuItem:(NSMenuItem*)menuItem {
+  AppController* controller = [NSApp delegate];
+  return [controller keyWindowIsNotModal];
+}
+
 // NSMenu delegate method: called just before menu is displayed.
 - (void)menuNeedsUpdate:(NSMenu*)menu {
   bridge_->UpdateMenu(menu);
 }
 
 // Return the a BookmarkNode that has the given id (called
 // "identifier" here to avoid conflict with objc's concept of "id").
 - (const BookmarkNode*)nodeForIdentifier:(int)identifier {
   return bridge_->GetBookmarkModel()->GetNodeByID(identifier);
 }
@@ skipping 14 matching lines @@
   const BookmarkNode* node = [self nodeForIdentifier:identifier];
   DCHECK(node);
   if (!node)
     return;  // shouldn't be reached
 
   [self openURLForNode:node];
 }
 
 @end  // BookmarkMenuCocoaController