[MD settings] adding c++ side of font settings

chrome/browser/ui/webui/settings/font_handler.cc

+// Copyright 2015 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/ui/webui/settings/font_handler.h"
+
+#include "base/bind_helpers.h"
+#include "base/i18n/rtl.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/character_encoding.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/options/font_settings_utils.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/font_list_async.h"
+#include "content/public/browser/web_ui.h"
+
+namespace settings {
+
+FontHandler::FontHandler(content::WebUI* webui)
+    : weak_ptr_factory_(this) {
+  // Perform validation for saved fonts.
+  PrefService* pref_service = Profile::FromWebUI(webui)->GetPrefs();
+  options::FontSettingsUtilities::ValidateSavedFonts(pref_service);
+}
+
+FontHandler::~FontHandler() {}
+
+void FontHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "fetchFontsData", base::Bind(&FontHandler::HandleFetchFontsData,
+                                   base::Unretained(this)));
+}
+
+void FontHandler::HandleFetchFontsData(
+    const base::ListValue* /*args*/) {
+  content::GetFontListAsync(base::Bind(&FontHandler::FontListHasLoaded,
+                                       weak_ptr_factory_.GetWeakPtr()));
+}
+
+void FontHandler::FontListHasLoaded(scoped_ptr<base::ListValue> list) {
+  // Font list. Selects the directionality for the fonts in the given list.
+  for (size_t i = 0; i < list->GetSize(); i++) {
+    base::ListValue* font;
+    bool has_font = list->GetList(i, &font);
+    DCHECK(has_font);
+
+    base::string16 value;
+    bool has_value = font->GetString(1, &value);
+    DCHECK(has_value);
+
+    bool has_rtl_chars = base::i18n::StringContainsStrongRTLChars(value);
+    font->Append(new base::StringValue(has_rtl_chars ? "rtl" : "ltr"));
+  }
+
+  // Character encoding list.
+  const std::vector<CharacterEncoding::EncodingInfo>* encodings;
+  PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
+  encodings = CharacterEncoding::GetCurrentDisplayEncodings(
+      g_browser_process->GetApplicationLocale(),
+      pref_service->GetString(prefs::kStaticEncodings),
+      pref_service->GetString(prefs::kRecentlySelectedEncoding));
+  DCHECK(!encodings->empty());
+
+  base::ListValue encoding_list;
+  for (const auto& it : *encodings) {
+    scoped_ptr<base::ListValue> option(new base::ListValue());
+    if (it.encoding_id) {
+      option->AppendString(
+          CharacterEncoding::GetCanonicalEncodingNameByCommandId(
+            it.encoding_id));
+      option->AppendString(it.encoding_display_name);
+      option->AppendString(
+          base::i18n::StringContainsStrongRTLChars(it.encoding_display_name)
+          ? "rtl"
+          : "ltr");
+    } else {
+      // Add empty value to indicate a separator item.
+      option->AppendString(std::string());
+    }
+    encoding_list.Append(option.Pass());
+  }
+
+  web_ui()->CallJavascriptFunction("Settings.setFontsData", *list,
+                                   encoding_list);
+}
+
+}  // namespace settings