Move navigation handling code from TranslateClient to TranslateDriver

components/translate/content/browser/content_translate_driver.cc

 // Copyright 2014 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 "components/translate/content/browser/content_translate_driver.h"
 
+#include "base/bind.h"
 #include "base/logging.h"
 #include "components/translate/content/common/translate_messages.h"
+#include "components/translate/core/browser/translate_download_manager.h"
+#include "components/translate/core/browser/translate_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/page_navigator.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/referrer.h"
+#include "net/http/http_status_code.h"
 #include "url/gurl.h"
 
+namespace {
+
+// The maximum number of attempts we'll do to see if the page has finshed
+// loading before giving up the translation
+const int kMaxTranslateLoadCheckAttempts = 20;
+
+}  // namespace
+
 namespace translate {
 
 ContentTranslateDriver::ContentTranslateDriver(
     content::NavigationController* nav_controller)
-    : navigation_controller_(nav_controller),
-      observer_(NULL) {
+    : content::WebContentsObserver(nav_controller->GetWebContents()),
+      navigation_controller_(nav_controller),
+      translate_manager_(NULL),
+      observer_(NULL),
+      max_reload_check_attempts_(kMaxTranslateLoadCheckAttempts),
+      weak_pointer_factory_(this) {
   DCHECK(navigation_controller_);
 }
 
 ContentTranslateDriver::~ContentTranslateDriver() {}
 
+void ContentTranslateDriver::InitiateTranslation(const std::string& page_lang,
+                                                 int attempt) {
+  if (translate_manager_->GetLanguageState().translation_pending())
+    return;
+
+  // During a reload we need web content to be available before the
+  // translate script is executed. Otherwise we will run the translate script on
+  // an empty DOM which will fail. Therefore we wait a bit to see if the page
+  // has finished.
+  if (web_contents()->IsLoading() && attempt < max_reload_check_attempts_) {
+    int backoff = attempt * kMaxTranslateLoadCheckAttempts;
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&ContentTranslateDriver::InitiateTranslation,
+                   weak_pointer_factory_.GetWeakPtr(),
+                   page_lang,
+                   attempt + 1),
+        base::TimeDelta::FromMilliseconds(backoff));
+    return;
+  }
+
+  translate_manager_->InitiateTranslation(
+      translate::TranslateDownloadManager::GetLanguageCode(page_lang));
+}
+
 // TranslateDriver methods
 
 bool ContentTranslateDriver::IsLinkNavigation() {
   return navigation_controller_ && navigation_controller_->GetActiveEntry() &&
          navigation_controller_->GetActiveEntry()->GetTransitionType() ==
              content::PAGE_TRANSITION_LINK;
 }
 
 void ContentTranslateDriver::OnTranslateEnabledChanged() {
   if (observer_) {
@@ skipping 62 matching lines @@
 
 void ContentTranslateDriver::OpenUrlInNewTab(const GURL& url) {
   content::OpenURLParams params(url,
                                 content::Referrer(),
                                 NEW_FOREGROUND_TAB,
                                 content::PAGE_TRANSITION_LINK,
                                 false);
   navigation_controller_->GetWebContents()->OpenURL(params);
 }
 
+// content::WebContentsObserver methods
+
+void ContentTranslateDriver::NavigationEntryCommitted(
+    const content::LoadCommittedDetails& load_details) {
+  // Check whether this is a reload: When doing a page reload, the
+  // TranslateLanguageDetermined IPC is not sent so the translation needs to be
+  // explicitly initiated.
+
+  content::NavigationEntry* entry =
+      web_contents()->GetController().GetActiveEntry();
+  if (!entry) {
+    NOTREACHED();
+    return;
+  }
+
+  // If the navigation happened while offline don't show the translate
+  // bar since there will be nothing to translate.
+  if (load_details.http_status_code == 0 ||
+      load_details.http_status_code == net::HTTP_INTERNAL_SERVER_ERROR) {
+    return;
+  }
+
+  if (!load_details.is_main_frame &&
+      translate_manager_->GetLanguageState().translation_declined()) {
+    // Some sites (such as Google map) may trigger sub-frame navigations
+    // when the user interacts with the page.  We don't want to show a new
+    // infobar if the user already dismissed one in that case.
+    return;
+  }
+
+  // If not a reload, return.
+  if (entry->GetTransitionType() != content::PAGE_TRANSITION_RELOAD &&
+      load_details.type != content::NAVIGATION_TYPE_SAME_PAGE) {
+    return;
+  }
+
+  if (!translate_manager_->GetLanguageState().page_needs_translation())
+    return;
+
+  // Note that we delay it as the ordering of the processing of this callback
+  // by WebContentsObservers is undefined and might result in the current
+  // infobars being removed. Since the translation initiation process might add
+  // an infobar, it must be done after that.
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&ContentTranslateDriver::InitiateTranslation,
+                 weak_pointer_factory_.GetWeakPtr(),
+                 translate_manager_->GetLanguageState().original_language(),
+                 0));
+}
+
+void ContentTranslateDriver::DidNavigateAnyFrame(
+    const content::LoadCommittedDetails& details,
+    const content::FrameNavigateParams& params) {
+  // Let the LanguageState clear its state.
+  const bool reload =
+      details.entry->GetTransitionType() == content::PAGE_TRANSITION_RELOAD ||
+      details.type == content::NAVIGATION_TYPE_SAME_PAGE;
+  translate_manager_->GetLanguageState().DidNavigate(
+      details.is_in_page, details.is_main_frame, reload);
+}
+
 }  // namespace translate