chrome/browser/ui/search/instant_page.cc

   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       instant_url_(instant_url),
  48       is_incognito_(is_incognito) {
  49 }
  50
  51 void 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
  66 bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
  67   return false;
  68 }
  69
  70 void 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
  81 void 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
  87 void 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
  95 void InstantPage::ClearContents() {
  96   if (contents())
  97     SearchTabHelper::FromWebContents(contents())->model()->RemoveObserver(this);
  98
  99   Observe(NULL);
 100 }