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/render_frame_host.h"
  19 #include "content/public/browser/web_contents.h"
  20 #include "content/public/common/frame_navigate_params.h"
  21
  22 InstantPage::Delegate::~Delegate() {
  23 }
  24
  25 InstantPage::~InstantPage() {
  26   if (web_contents()) {
  27     SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
  28         this);
  29   }
  30 }
  31
  32 bool InstantPage::supports_instant() const {
  33   return web_contents() &&
  34       SearchTabHelper::FromWebContents(web_contents())->SupportsInstant();
  35 }
  36
  37 const std::string& InstantPage::instant_url() const {
  38   return instant_url_;
  39 }
  40
  41 bool InstantPage::IsLocal() const {
  42   return web_contents() &&
  43       web_contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
  44 }
  45
  46 InstantPage::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
  54 void 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
  70 bool InstantPage::ShouldProcessAboutToNavigateMainFrame() {
  71   return false;
  72 }
  73
  74 void 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
  83 void 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
  89 void 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
  97 void InstantPage::ClearContents() {
  98   if (web_contents()) {
  99     SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
 100         this);
 101   }
 102
 103   Observe(NULL);
 104 }