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      instant_url_(instant_url),
48      is_incognito_(is_incognito) {
49}
50
51void InstantPage::SetContents(content::WebContents* web_contents) {
52  ClearContents();
53
54  if (!web_contents)
55    return;
56
57  Observe(web_contents);
58  SearchModel* model = SearchTabHelper::FromWebContents(contents())->model();
59  model->AddObserver(this);
60
61  // Already know whether the page supports instant.
62  if (model->instant_support() != INSTANT_SUPPORT_UNKNOWN)
63    InstantSupportDetermined(model->instant_support() == INSTANT_SUPPORT_YES);
64}
65
66bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
67  return false;
68}
69
70void InstantPage::DidCommitProvisionalLoadForFrame(
71    int64 /* frame_id */,
72    const base::string16& frame_unique_name,
73    bool is_main_frame,
74    const GURL& url,
75    content::PageTransition /* transition_type */,
76    content::RenderViewHost* /* render_view_host */) {
77  if (is_main_frame && ShouldProcessAboutToNavigateMainFrame())
78    delegate_->InstantPageAboutToNavigateMainFrame(contents(), url);
79}
80
81void InstantPage::ModelChanged(const SearchModel::State& old_state,
82                               const SearchModel::State& new_state) {
83  if (old_state.instant_support != new_state.instant_support)
84    InstantSupportDetermined(new_state.instant_support == INSTANT_SUPPORT_YES);
85}
86
87void InstantPage::InstantSupportDetermined(bool supports_instant) {
88  delegate_->InstantSupportDetermined(contents(), supports_instant);
89
90  // If the page doesn't support Instant, stop listening to it.
91  if (!supports_instant)
92    ClearContents();
93}
94
95void InstantPage::ClearContents() {
96  if (contents())
97    SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
98
99  Observe(NULL);
100}
101