components/translate/ios/browser/js_language_detection_manager.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_TRANSLATE_IOS_BROWSER_JS_LANGUAGE_DETECTION_MANAGER_H_
   6 #define COMPONENTS_TRANSLATE_IOS_BROWSER_JS_LANGUAGE_DETECTION_MANAGER_H_
   7
   8 #import <Foundation/Foundation.h>
   9
  10 #include "base/callback_forward.h"
  11 #include "base/strings/string16.h"
  12 #import "ios/web/public/web_state/js/crw_js_injection_manager.h"
  13
  14 namespace language_detection {
  15
  16 // Maximum length of the extracted text returned by |-extractTextContent|.
  17 // Matches desktop implementation.
  18 extern const size_t kMaxIndexChars;
  19
  20 // Type for the callback called when the buffered text is retrieved.
  21 using BufferedTextCallback = base::Callback<void(const base::string16&)>;
  22
  23 }  // namespace language_detection
  24
  25 // JsLanguageDetectionManager manages the scripts related to language detection.
  26 @interface JsLanguageDetectionManager : CRWJSInjectionManager
  27
  28 // Retrieves the cached text content of the page from the JS side. Calls
  29 // |callback| with the page's text contents. The cache is purged on the JS side
  30 // after this call. |callback| must be non null.
  31 - (void)retrieveBufferedTextContent:
  32         (const language_detection::BufferedTextCallback&)callback;
  33
  34 // Starts detecting the language of the page.
  35 - (void)startLanguageDetection;
  36
  37 @end
  38
  39 #endif  // COMPONENTS_TRANSLATE_IOS_BROWSER_JS_LANGUAGE_DETECTION_MANAGER_H_