Alternate NTP: Limit width of tab titles in recent tabs menu

chrome/browser/ui/cocoa/menu_controller.mm

 // Copyright (c) 2012 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/menu_controller.h"
 
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/event_utils.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/accelerators/platform_accelerator_cocoa.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/base/models/simple_menu_model.h"
+#include "ui/base/text/text_elider.h"
 #include "ui/gfx/image/image.h"
 
 @interface MenuController (Private)
 - (void)addSeparatorToMenu:(NSMenu*)menu
                    atIndex:(int)index;
 @end
 
 @implementation MenuController
 
 @synthesize model = model_;
 @synthesize useWithPopUpButtonCell = useWithPopUpButtonCell_;
 
++ (string16)elideMenuTitle:(const string16&)title
+                   toWidth:(int)width {
+  NSFont* nsfont = [NSFont menuBarFontOfSize:0];  // 0 means "default"
+  gfx::Font font(base::SysNSStringToUTF8([nsfont fontName]),
+                 static_cast<int>([nsfont pointSize]));
+  return ui::ElideText(title, font, width, ui::ELIDE_AT_END);
+}
+
 - (id)init {
   self = [super init];
   return self;
 }
 
 - (id)initWithModel:(ui::MenuModel*)model
     useWithPopUpButtonCell:(BOOL)useWithCell {
   if ((self = [super init])) {
     model_ = model;
     useWithPopUpButtonCell_ = useWithCell;
@@ skipping 40 matching lines @@
       [self addItemToMenu:menu
                   atIndex:index
                 fromModel:model
                modelIndex:modelIndex];
     }
   }
 
   return menu;
 }
 
+- (int)maxWidthForMenuModel:(ui::MenuModel*)model
+                 modelIndex:(int)modelIndex {
+  return -1;
+}
+
 // Adds a separator item at the given index. As the separator doesn't need
 // anything from the model, this method doesn't need the model index as the
 // other method below does.
 - (void)addSeparatorToMenu:(NSMenu*)menu
                    atIndex:(int)index {
   NSMenuItem* separator = [NSMenuItem separatorItem];
   [menu insertItem:separator atIndex:index];
 }
 
 // Adds an item or a hierarchical menu to the item at the |index|,
 // associated with the entry in the model indentifed by |modelIndex|.
 - (void)addItemToMenu:(NSMenu*)menu
               atIndex:(NSInteger)index
             fromModel:(ui::MenuModel*)model
            modelIndex:(int)modelIndex {
-  NSString* label =
-      l10n_util::FixUpWindowsStyleLabel(model->GetLabelAt(modelIndex));
+  string16 label16 = model->GetLabelAt(modelIndex);
+  int maxWidth = [self maxWidthForMenuModel:model modelIndex:modelIndex];
+  if (maxWidth != -1)
+    label16 = [MenuController elideMenuTitle:label16 toWidth:maxWidth];
+
+  NSString* label = l10n_util::FixUpWindowsStyleLabel(label16);
   scoped_nsobject<NSMenuItem> item(
       [[NSMenuItem alloc] initWithTitle:label
                                  action:@selector(itemSelected:)
                           keyEquivalent:@""]);
 
   // If the menu item has an icon, set it.
   gfx::Image icon;
   if (model->GetIconAt(modelIndex, &icon) && !icon.IsEmpty())
     [item setImage:icon.ToNSImage()];
 
@@ skipping 101 matching lines @@
 }
 
 - (void)menuDidClose:(NSMenu*)menu {
   if (isMenuOpen_) {
     model_->MenuClosed();
     isMenuOpen_ = NO;
   }
 }
 
 @end