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      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 }
    105