Mac: Elides the beginning of tab titles that have common prefixes

chrome/browser/ui/cocoa/tabs/tab_controller.mm

 // Copyright (c) 2011 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 "base/mac/mac_util.h"
 #include "chrome/browser/accessibility/browser_accessibility_state.h"
 #import "chrome/browser/themes/browser_theme_provider.h"
 #import "chrome/browser/ui/cocoa/menu_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #import "chrome/common/extensions/extension.h"
 #include "grit/generated_resources.h"
+#import "third_party/GTM/AppKit/GTMFadeTruncatingTextFieldCell.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 @implementation TabController
 
 @synthesize action = action_;
 @synthesize app = app_;
 @synthesize loadingState = loadingState_;
 @synthesize mini = mini_;
 @synthesize pinned = pinned_;
 @synthesize target = target_;
@@ skipping 278 matching lines @@
 
 // Called by the tabs to determine whether we are in rapid (tab) closure mode.
 - (BOOL)inRapidClosureMode {
   if ([[self target] respondsToSelector:@selector(inRapidClosureMode)]) {
     return [[self target] performSelector:@selector(inRapidClosureMode)] ?
         YES : NO;
   }
   return NO;
 }
 
+- (void)setTitleCommonPrefixLength:(NSUInteger)length {
+  DCHECK([[titleView_ cell] isKindOfClass:
+      [GTMFadeTruncatingTextFieldCell class]]);
+  GTMFadeTruncatingTextFieldCell* cell = [titleView_ cell];
+  [cell setDesiredCharactersToTruncateFromHead:length];
+  [cell setTruncateMode:length > 0 ? GTMFadeTruncatingHeadAndTail :
+                                     GTMFadeTruncatingTail];
+}
+
 @end