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
21InstantPage::Delegate::~Delegate() {
22}
23
24InstantPage::~InstantPage() {
25  if (contents())
26    SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
27}
28
29bool InstantPage::supports_instant() const {
30  return contents() ?
31      SearchTabHelper::FromWebContents(contents())->SupportsInstant() : false;
32}
33
34const std::string& InstantPage::instant_url() const {
35  return instant_url_;
36}
37
38bool InstantPage::IsLocal() const {
39  return contents() &&
40      contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
41}
42
43InstantPage::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
52void 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
68bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
69  return false;
70}
71
72void 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
83void 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
93void 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
105void 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
111void 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
119void InstantPage::ClearContents() {
120  if (contents())
121    SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
122
123  sender()->SetContents(NULL);
124  Observe(NULL);
125}
126