1 // Copyright (c) 2011 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.
5 #ifndef CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_
6 #define CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_
10 #include "base/basictypes.h"
12 class LanguageStateObserver;
15 struct LoadCommittedDetails;
16 class NavigationController;
20 // This class holds the language state of the current page.
21 // There is one LanguageState instance per WebContents.
22 // It is used to determine when navigating to a new page whether it should
23 // automatically be translated.
24 // This auto-translate behavior is the expected behavior when:
25 // - user is on page in language A that they had translated to language B.
26 // - user clicks a link in that page that takes them to a page also in language
31 explicit LanguageState(content::NavigationController* nav_controller);
34 // Should be called when the page did a new navigation (whether it is a main
35 // frame or sub-frame navigation).
36 void DidNavigate(const content::LoadCommittedDetails& details);
38 // Should be called when the language of the page has been determined.
39 // |page_needs_translation| when false indicates that the browser should not
40 // offer to translate the page.
41 void LanguageDetermined(const std::string& page_language,
42 bool page_needs_translation);
44 // Returns the language the current page should be translated to, based on the
45 // previous page languages and the transition. This should be called after
46 // the language page has been determined.
47 // Returns an empty string if the page should not be auto-translated.
48 std::string AutoTranslateTo() const;
50 // Returns true if the user is navigating through translated links.
51 bool InTranslateNavigation() const;
53 // Returns true if the current page in the associated tab has been translated.
54 bool IsPageTranslated() const { return original_lang_ != current_lang_; }
56 const std::string& original_language() const { return original_lang_; }
58 void set_current_language(const std::string& language) {
59 current_lang_ = language;
61 const std::string& current_language() const { return current_lang_; }
63 bool page_needs_translation() const { return page_needs_translation_; }
65 // Whether the page is currently in the process of being translated.
66 bool translation_pending() const { return translation_pending_; }
67 void set_translation_pending(bool value) { translation_pending_ = value; }
69 // Whether the user has already declined to translate the page.
70 bool translation_declined() const { return translation_declined_; }
71 void set_translation_declined(bool value) { translation_declined_ = value; }
73 // Whether the current page was navigated through an in-page (fragment)
75 bool in_page_navigation() const { return in_page_navigation_; }
77 // Whether the translate is enabled. This value is supposed to be used for the
78 // Translate icon on the Omnibox.
79 bool translate_enabled() const { return translate_enabled_; }
80 void SetTranslateEnabled(bool value);
82 // Whether the current page's language is different from the previous
84 bool HasLanguageChanged() const;
86 void set_observer(LanguageStateObserver* observer) { observer_ = observer; }
89 // The languages this page is in. Note that current_lang_ is different from
90 // original_lang_ when the page has been translated.
91 // Note that these might be empty if the page language has not been determined
93 std::string original_lang_;
94 std::string current_lang_;
96 // Same as above but for the previous page.
97 std::string prev_original_lang_;
98 std::string prev_current_lang_;
100 // The navigation controller of the tab we are associated with.
101 content::NavigationController* navigation_controller_;
103 // Whether it is OK to offer to translate the page. Some pages explictly
104 // specify that they should not be translated by the browser (this is the case
105 // for GMail for example, which provides its own translation features).
106 bool page_needs_translation_;
108 // Whether a translation is currently pending (WebContents waiting for the
109 // PAGE_TRANSLATED notification). This is needed to avoid sending duplicate
110 // translate requests to a page. TranslateManager initiates translations
111 // when it received the LANGUAGE_DETERMINED notification. This is sent by
112 // the renderer with the page contents, every time the load stops for the
113 // main frame, so we may get several.
114 // TODO(jcampan): make the renderer send the language just once per navigation
115 // then we can get rid of that state.
116 bool translation_pending_;
118 // Whether the user has declined to translate the page (by closing the infobar
119 // for example). This is necessary as a new infobar could be shown if a new
120 // load happens in the page after the user closed the infobar.
121 bool translation_declined_;
123 // Whether the current navigation is a fragment navigation (in page).
124 bool in_page_navigation_;
126 // Whether the Translate is enabled.
127 bool translate_enabled_;
129 LanguageStateObserver* observer_;
131 DISALLOW_COPY_AND_ASSIGN(LanguageState);
134 #endif // CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_