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      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 #include "chrome/browser/ui/search/instant_page.h"
      6 
      7 #include "chrome/browser/profiles/profile.h"
      8 #include "chrome/browser/search/search.h"
      9 #include "chrome/browser/ui/search/search_model.h"
     10 #include "chrome/browser/ui/search/search_tab_helper.h"
     11 #include "chrome/common/render_messages.h"
     12 #include "chrome/common/url_constants.h"
     13 #include "content/public/browser/navigation_controller.h"
     14 #include "content/public/browser/navigation_details.h"
     15 #include "content/public/browser/navigation_entry.h"
     16 #include "content/public/browser/notification_service.h"
     17 #include "content/public/browser/notification_source.h"
     18 #include "content/public/browser/web_contents.h"
     19 #include "content/public/common/frame_navigate_params.h"
     20 
     21 InstantPage::Delegate::~Delegate() {
     22 }
     23 
     24 InstantPage::~InstantPage() {
     25   if (contents())
     26     SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
     27 }
     28 
     29 bool InstantPage::supports_instant() const {
     30   return contents() ?
     31       SearchTabHelper::FromWebContents(contents())->SupportsInstant() : false;
     32 }
     33 
     34 const std::string& InstantPage::instant_url() const {
     35   return instant_url_;
     36 }
     37 
     38 bool InstantPage::IsLocal() const {
     39   return contents() &&
     40       contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
     41 }
     42 
     43 InstantPage::InstantPage(Delegate* delegate, const std::string& instant_url,
     44                          Profile* profile, bool is_incognito)
     45     : profile_(profile),
     46       delegate_(delegate),
     47       ipc_sender_(InstantIPCSender::Create(is_incognito)),
     48       instant_url_(instant_url),
     49       is_incognito_(is_incognito) {
     50 }
     51 
     52 void InstantPage::SetContents(content::WebContents* web_contents) {
     53   ClearContents();
     54 
     55   if (!web_contents)
     56     return;
     57 
     58   sender()->SetContents(web_contents);
     59   Observe(web_contents);
     60   SearchModel* model = SearchTabHelper::FromWebContents(contents())->model();
     61   model->AddObserver(this);
     62 
     63   // Already know whether the page supports instant.
     64   if (model->instant_support() != INSTANT_SUPPORT_UNKNOWN)
     65     InstantSupportDetermined(model->instant_support() == INSTANT_SUPPORT_YES);
     66 }
     67 
     68 bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
     69   return false;
     70 }
     71 
     72 void InstantPage::DidCommitProvisionalLoadForFrame(
     73     int64 /* frame_id */,
     74     const base::string16& frame_unique_name,
     75     bool is_main_frame,
     76     const GURL& url,
     77     content::PageTransition /* transition_type */,
     78     content::RenderViewHost* /* render_view_host */) {
     79   if (is_main_frame && ShouldProcessAboutToNavigateMainFrame())
     80     delegate_->InstantPageAboutToNavigateMainFrame(contents(), url);
     81 }
     82 
     83 void InstantPage::DidNavigateMainFrame(
     84     const content::LoadCommittedDetails& details,
     85     const content::FrameNavigateParams& /* params */) {
     86   // A 204 can be sent by the search provider as a lightweight signal
     87   // to fall back to the local page, and we obviously want to fall back
     88   // if we get any response code that indicates an error.
     89   if (details.http_status_code == 204 || details.http_status_code >= 400)
     90     delegate_->InstantPageLoadFailed(contents());
     91 }
     92 
     93 void InstantPage::DidFailProvisionalLoad(
     94     int64 /* frame_id */,
     95     const base::string16& frame_unique_name,
     96     bool is_main_frame,
     97     const GURL& /* validated_url */,
     98     int /* error_code */,
     99     const base::string16& /* error_description */,
    100     content::RenderViewHost* /* render_view_host */) {
    101   if (is_main_frame)
    102     delegate_->InstantPageLoadFailed(contents());
    103 }
    104 
    105 void InstantPage::ModelChanged(const SearchModel::State& old_state,
    106                                const SearchModel::State& new_state) {
    107   if (old_state.instant_support != new_state.instant_support)
    108     InstantSupportDetermined(new_state.instant_support == INSTANT_SUPPORT_YES);
    109 }
    110 
    111 void InstantPage::InstantSupportDetermined(bool supports_instant) {
    112   delegate_->InstantSupportDetermined(contents(), supports_instant);
    113 
    114   // If the page doesn't support Instant, stop listening to it.
    115   if (!supports_instant)
    116     ClearContents();
    117 }
    118 
    119 void InstantPage::ClearContents() {
    120   if (contents())
    121     SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
    122 
    123   sender()->SetContents(NULL);
    124   Observe(NULL);
    125 }
    126