Convert NavigationEntry title to string16. TabContents::GetTitle no longer ne...

chrome/browser/tab_contents/navigation_entry.cc

 // Copyright (c) 2006-2008 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/tab_contents/navigation_entry.h"
 
+#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/common/gfx/text_elider.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/pref_service.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/common/resource_bundle.h"
 
 // Use this to get a new unique ID for a NavigationEntry during construction.
 // The returned ID is guaranteed to be nonzero (which is the "no ID" indicator).
 static int GetUniqueID() {
   static int unique_id_counter = 0;
   return ++unique_id_counter;
 }
 
@@ skipping 19 matching lines @@
       transition_type_(PageTransition::LINK),
       has_post_data_(false),
       restored_(false) {
 }
 
 NavigationEntry::NavigationEntry(TabContentsType type,
                                  SiteInstance* instance,
                                  int page_id,
                                  const GURL& url,
                                  const GURL& referrer,
-                                 const std::wstring& title,
+                                 const string16& title,
                                  PageTransition::Type transition_type)
     : unique_id_(GetUniqueID()),
       tab_type_(type),
       site_instance_(instance),
       page_type_(NORMAL_PAGE),
       url_(url),
       referrer_(referrer),
       title_(title),
       page_id_(page_id),
       transition_type_(transition_type),
       has_post_data_(false),
       restored_(false) {
 }
 
-const std::wstring& NavigationEntry::GetTitleForDisplay() {
-  if (title_.empty())
-    return display_url_as_string_;
-  return title_;
+const string16& NavigationEntry::GetTitleForDisplay(
+    const NavigationController* navigation_controller) {
+  // Most pages have real titles. Don't even bother caching anything if this is
+  // the case.
+  if (!title_.empty())
+    return title_;
+
+  // More complicated cases will use the URLs as the title. This result we will
+  // cache since it's more complicated to compute.
+  if (!cached_display_title_.empty())
+    return cached_display_title_;
+
+  // Use the display URL first if any, and fall back on using the real URL.
+  std::wstring languages;
+  if (navigation_controller) {
+      languages = navigation_controller->profile()->GetPrefs()->GetString(
+          prefs::kAcceptLanguages);
+  }
+  if (!display_url_.is_empty()) {
+    cached_display_title_ = WideToUTF16Hack(gfx::GetCleanStringFromUrl(
+        display_url_, languages, NULL, NULL));
+  } else if (!url_.is_empty()) {
+    cached_display_title_ = WideToUTF16Hack(gfx::GetCleanStringFromUrl(
+        display_url_, languages, NULL, NULL));
+  }
+  return cached_display_title_;
 }
 
 bool NavigationEntry::IsViewSourceMode() const {
   return display_url_.SchemeIs(chrome::kViewSourceScheme);
 }