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/render_frame_host.h"
19#include "content/public/browser/web_contents.h"
20#include "content/public/common/frame_navigate_params.h"
21
22InstantPage::Delegate::~Delegate() {
23}
24
25InstantPage::~InstantPage() {
26  if (web_contents()) {
27    SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
28        this);
29  }
30}
31
32bool InstantPage::supports_instant() const {
33  return web_contents() &&
34      SearchTabHelper::FromWebContents(web_contents())->SupportsInstant();
35}
36
37const std::string& InstantPage::instant_url() const {
38  return instant_url_;
39}
40
41bool InstantPage::IsLocal() const {
42  return web_contents() &&
43      web_contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
44}
45
46InstantPage::InstantPage(Delegate* delegate, const std::string& instant_url,
47                         Profile* profile, bool is_incognito)
48    : profile_(profile),
49      delegate_(delegate),
50      instant_url_(instant_url),
51      is_incognito_(is_incognito) {
52}
53
54void InstantPage::SetContents(content::WebContents* new_web_contents) {
55  ClearContents();
56
57  if (!new_web_contents)
58    return;
59
60  Observe(new_web_contents);
61  SearchModel* model =
62      SearchTabHelper::FromWebContents(web_contents())->model();
63  model->AddObserver(this);
64
65  // Already know whether the page supports instant.
66  if (model->instant_support() != INSTANT_SUPPORT_UNKNOWN)
67    InstantSupportDetermined(model->instant_support() == INSTANT_SUPPORT_YES);
68}
69
70bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
71  return false;
72}
73
74void InstantPage::DidCommitProvisionalLoadForFrame(
75    content::RenderFrameHost* render_frame_host,
76    const GURL& url,
77    ui::PageTransition /* transition_type */) {
78  if (!render_frame_host->GetParent() &&
79      ShouldProcessAboutToNavigateMainFrame())
80    delegate_->InstantPageAboutToNavigateMainFrame(web_contents(), url);
81}
82
83void InstantPage::ModelChanged(const SearchModel::State& old_state,
84                               const SearchModel::State& new_state) {
85  if (old_state.instant_support != new_state.instant_support)
86    InstantSupportDetermined(new_state.instant_support == INSTANT_SUPPORT_YES);
87}
88
89void InstantPage::InstantSupportDetermined(bool supports_instant) {
90  delegate_->InstantSupportDetermined(web_contents(), supports_instant);
91
92  // If the page doesn't support Instant, stop listening to it.
93  if (!supports_instant)
94    ClearContents();
95}
96
97void InstantPage::ClearContents() {
98  if (web_contents()) {
99    SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
100        this);
101  }
102
103  Observe(NULL);
104}
105