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