src/chrome/browser/ui/omnibox/omnibox_controller.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/omnibox/omnibox_controller.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
   9 #include "chrome/browser/autocomplete/autocomplete_match.h"
  10 #include "chrome/browser/autocomplete/search_provider.h"
  11 #include "chrome/browser/net/predictor.h"
  12 #include "chrome/browser/predictors/autocomplete_action_predictor.h"
  13 #include "chrome/browser/prerender/prerender_field_trial.h"
  14 #include "chrome/browser/prerender/prerender_manager.h"
  15 #include "chrome/browser/prerender/prerender_manager_factory.h"
  16 #include "chrome/browser/profiles/profile.h"
  17 #include "chrome/browser/search/search.h"
  18 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
  19 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
  20 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
  21 #include "chrome/browser/ui/omnibox/omnibox_popup_view.h"
  22 #include "chrome/browser/ui/search/instant_controller.h"
  23 #include "chrome/common/instant_types.h"
  24 #include "extensions/common/constants.h"
  25 #include "ui/gfx/rect.h"
  26
  27 namespace {
  28
  29 // Returns the AutocompleteMatch that the InstantController should prefetch, if
  30 // any.
  31 //
  32 // The SearchProvider may mark some suggestions to be prefetched based on
  33 // instructions from the suggest server. If such a match ranks sufficiently
  34 // highly, we'll return it. We only care about matches that are the default or
  35 // else the very first entry in the dropdown (which can happen for non-default
  36 // matches only if we're hiding a top verbatim match); for other matches, we
  37 // think the likelihood of the user selecting them is low enough that
  38 // prefetching isn't worth doing.
  39 const AutocompleteMatch* GetMatchToPrefetch(const AutocompleteResult& result) {
  40   const AutocompleteResult::const_iterator default_match(
  41       result.default_match());
  42   if (default_match == result.end())
  43     return NULL;
  44
  45   if (SearchProvider::ShouldPrefetch(*default_match))
  46     return &(*default_match);
  47
  48   return (result.ShouldHideTopMatch() && (result.size() > 1) &&
  49       SearchProvider::ShouldPrefetch(result.match_at(1))) ?
  50           &result.match_at(1) : NULL;
  51 }
  52
  53 }  // namespace
  54
  55 OmniboxController::OmniboxController(OmniboxEditModel* omnibox_edit_model,
  56                                      Profile* profile)
  57     : omnibox_edit_model_(omnibox_edit_model),
  58       profile_(profile),
  59       autocomplete_controller_(new AutocompleteController(profile, this,
  60           AutocompleteClassifier::kDefaultOmniboxProviders)) {
  61 }
  62
  63 OmniboxController::~OmniboxController() {
  64 }
  65
  66 void OmniboxController::StartAutocomplete(
  67     string16 user_text,
  68     size_t cursor_position,
  69     const GURL& current_url,
  70     AutocompleteInput::PageClassification current_page_classification,
  71     bool prevent_inline_autocomplete,
  72     bool prefer_keyword,
  73     bool allow_exact_keyword_match) const {
  74   ClearPopupKeywordMode();
  75   popup_->SetHoveredLine(OmniboxPopupModel::kNoMatch);
  76
  77   // We don't explicitly clear OmniboxPopupModel::manually_selected_match, as
  78   // Start ends up invoking OmniboxPopupModel::OnResultChanged which clears it.
  79   autocomplete_controller_->Start(AutocompleteInput(
  80       user_text, cursor_position, string16(), current_url,
  81       current_page_classification, prevent_inline_autocomplete,
  82       prefer_keyword, allow_exact_keyword_match,
  83       AutocompleteInput::ALL_MATCHES));
  84 }
  85
  86 void OmniboxController::OnResultChanged(bool default_match_changed) {
  87   const bool was_open = popup_->IsOpen();
  88   if (default_match_changed) {
  89     // The default match has changed, we need to let the OmniboxEditModel know
  90     // about new inline autocomplete text (blue highlight).
  91     const AutocompleteResult& result = this->result();
  92     const AutocompleteResult::const_iterator match(result.default_match());
  93     if (match != result.end()) {
  94       current_match_ = *match;
  95       if (!prerender::IsOmniboxEnabled(profile_))
  96         DoPreconnect(*match);
  97       omnibox_edit_model_->OnCurrentMatchChanged();
  98
  99       if (chrome::IsInstantExtendedAPIEnabled() &&
 100           omnibox_edit_model_->GetInstantController()) {
 101         InstantSuggestion prefetch_suggestion;
 102         const AutocompleteMatch* match_to_prefetch = GetMatchToPrefetch(result);
 103         if (match_to_prefetch) {
 104           prefetch_suggestion.text = match_to_prefetch->contents;
 105           prefetch_suggestion.metadata =
 106               SearchProvider::GetSuggestMetadata(*match_to_prefetch);
 107         }
 108         // Send the prefetch suggestion unconditionally to the InstantPage. If
 109         // there is no suggestion to prefetch, we need to send a blank query to
 110         // clear the prefetched results.
 111         omnibox_edit_model_->GetInstantController()->SetSuggestionToPrefetch(
 112             prefetch_suggestion);
 113       }
 114     } else {
 115       InvalidateCurrentMatch();
 116       popup_->OnResultChanged();
 117       omnibox_edit_model_->OnPopupDataChanged(string16(), NULL, string16(),
 118                                               false);
 119     }
 120   } else {
 121     popup_->OnResultChanged();
 122   }
 123
 124   if (!popup_->IsOpen() && was_open) {
 125     // Accept the temporary text as the user text, because it makes little sense
 126     // to have temporary text when the popup is closed.
 127     omnibox_edit_model_->AcceptTemporaryTextAsUserText();
 128   }
 129 }
 130
 131 void OmniboxController::InvalidateCurrentMatch() {
 132   current_match_ = AutocompleteMatch();
 133 }
 134
 135 void OmniboxController::ClearPopupKeywordMode() const {
 136   if (popup_->IsOpen() &&
 137       popup_->selected_line_state() == OmniboxPopupModel::KEYWORD)
 138     popup_->SetSelectedLineState(OmniboxPopupModel::NORMAL);
 139 }
 140
 141 void OmniboxController::DoPreconnect(const AutocompleteMatch& match) {
 142   if (!match.destination_url.SchemeIs(extensions::kExtensionScheme)) {
 143     // Warm up DNS Prefetch cache, or preconnect to a search service.
 144     UMA_HISTOGRAM_ENUMERATION("Autocomplete.MatchType", match.type,
 145                               AutocompleteMatchType::NUM_TYPES);
 146     if (profile_->GetNetworkPredictor()) {
 147       profile_->GetNetworkPredictor()->AnticipateOmniboxUrl(
 148           match.destination_url,
 149           predictors::AutocompleteActionPredictor::IsPreconnectable(match));
 150     }
 151     // We could prefetch the alternate nav URL, if any, but because there
 152     // can be many of these as a user types an initial series of characters,
 153     // the OS DNS cache could suffer eviction problems for minimal gain.
 154   }
 155 }