1 // Copyright (c) 2012 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/autocomplete/autocomplete_controller.h" 6 7 #include <set> 8 #include <string> 9 10 #include "base/command_line.h" 11 #include "base/format_macros.h" 12 #include "base/logging.h" 13 #include "base/metrics/histogram.h" 14 #include "base/strings/string_number_conversions.h" 15 #include "base/strings/stringprintf.h" 16 #include "base/time/time.h" 17 #include "chrome/browser/autocomplete/autocomplete_controller_delegate.h" 18 #include "chrome/browser/autocomplete/bookmark_provider.h" 19 #include "chrome/browser/autocomplete/builtin_provider.h" 20 #include "chrome/browser/autocomplete/extension_app_provider.h" 21 #include "chrome/browser/autocomplete/history_quick_provider.h" 22 #include "chrome/browser/autocomplete/history_url_provider.h" 23 #include "chrome/browser/autocomplete/keyword_provider.h" 24 #include "chrome/browser/autocomplete/search_provider.h" 25 #include "chrome/browser/autocomplete/shortcuts_provider.h" 26 #include "chrome/browser/autocomplete/zero_suggest_provider.h" 27 #include "chrome/browser/chrome_notification_types.h" 28 #include "chrome/browser/omnibox/omnibox_field_trial.h" 29 #include "chrome/browser/profiles/profile.h" 30 #include "chrome/browser/search/search.h" 31 #include "chrome/browser/search_engines/template_url.h" 32 #include "chrome/common/chrome_switches.h" 33 #include "content/public/browser/notification_service.h" 34 #include "grit/generated_resources.h" 35 #include "grit/theme_resources.h" 36 #include "ui/base/l10n/l10n_util.h" 37 38 #if defined(OS_CHROMEOS) 39 #include "chrome/browser/autocomplete/contact_provider_chromeos.h" 40 #include "chrome/browser/chromeos/contacts/contact_manager.h" 41 #endif 42 43 namespace { 44 45 // Converts the given match to a type (and possibly subtype) based on the AQS 46 // specification. For more details, see 47 // http://goto.google.com/binary-clients-logging. 48 void AutocompleteMatchToAssistedQuery( 49 const AutocompleteMatch::Type& match, size_t* type, size_t* subtype) { 50 // This type indicates a native chrome suggestion. 51 *type = 69; 52 // Default value, indicating no subtype. 53 *subtype = string16::npos; 54 55 switch (match) { 56 case AutocompleteMatchType::SEARCH_SUGGEST: { 57 *type = 0; 58 return; 59 } 60 case AutocompleteMatchType::NAVSUGGEST: { 61 *type = 5; 62 return; 63 } 64 case AutocompleteMatchType::SEARCH_WHAT_YOU_TYPED: { 65 *subtype = 57; 66 return; 67 } 68 case AutocompleteMatchType::URL_WHAT_YOU_TYPED: { 69 *subtype = 58; 70 return; 71 } 72 case AutocompleteMatchType::SEARCH_HISTORY: { 73 *subtype = 59; 74 return; 75 } 76 case AutocompleteMatchType::HISTORY_URL: { 77 *subtype = 60; 78 return; 79 } 80 case AutocompleteMatchType::HISTORY_TITLE: { 81 *subtype = 61; 82 return; 83 } 84 case AutocompleteMatchType::HISTORY_BODY: { 85 *subtype = 62; 86 return; 87 } 88 case AutocompleteMatchType::HISTORY_KEYWORD: { 89 *subtype = 63; 90 return; 91 } 92 case AutocompleteMatchType::BOOKMARK_TITLE: { 93 *subtype = 65; 94 return; 95 } 96 default: { 97 // This value indicates a native chrome suggestion with no named subtype 98 // (yet). 99 *subtype = 64; 100 } 101 } 102 } 103 104 // Appends available autocompletion of the given type, subtype, and number to 105 // the existing available autocompletions string, encoding according to the 106 // spec. 107 void AppendAvailableAutocompletion(size_t type, 108 size_t subtype, 109 int count, 110 std::string* autocompletions) { 111 if (!autocompletions->empty()) 112 autocompletions->append("j"); 113 base::StringAppendF(autocompletions, "%" PRIuS, type); 114 // Subtype is optional - string16::npos indicates no subtype. 115 if (subtype != string16::npos) 116 base::StringAppendF(autocompletions, "i%" PRIuS, subtype); 117 if (count > 1) 118 base::StringAppendF(autocompletions, "l%d", count); 119 } 120 121 // Returns whether the autocompletion is trivial enough that we consider it 122 // an autocompletion for which the omnibox autocompletion code did not add 123 // any value. 124 bool IsTrivialAutocompletion(const AutocompleteMatch& match) { 125 return match.type == AutocompleteMatchType::SEARCH_WHAT_YOU_TYPED || 126 match.type == AutocompleteMatchType::URL_WHAT_YOU_TYPED || 127 match.type == AutocompleteMatchType::SEARCH_OTHER_ENGINE; 128 } 129 130 } // namespace 131 132 const int AutocompleteController::kNoItemSelected = -1; 133 134 AutocompleteController::AutocompleteController( 135 Profile* profile, 136 AutocompleteControllerDelegate* delegate, 137 int provider_types) 138 : delegate_(delegate), 139 history_url_provider_(NULL), 140 keyword_provider_(NULL), 141 search_provider_(NULL), 142 zero_suggest_provider_(NULL), 143 in_stop_timer_field_trial_( 144 OmniboxFieldTrial::InStopTimerFieldTrialExperimentGroup()), 145 done_(true), 146 in_start_(false), 147 in_zero_suggest_(false), 148 profile_(profile) { 149 // AND with the disabled providers, if any. 150 provider_types &= ~OmniboxFieldTrial::GetDisabledProviderTypes(); 151 bool use_hqp = !!(provider_types & AutocompleteProvider::TYPE_HISTORY_QUICK); 152 // TODO(mrossetti): Permanently modify the HistoryURLProvider to not search 153 // titles once HQP is turned on permanently. 154 155 if (provider_types & AutocompleteProvider::TYPE_BUILTIN) 156 providers_.push_back(new BuiltinProvider(this, profile)); 157 #if defined(OS_CHROMEOS) 158 if (provider_types & AutocompleteProvider::TYPE_CONTACT) 159 providers_.push_back(new ContactProvider(this, profile, 160 contacts::ContactManager::GetInstance()->GetWeakPtr())); 161 #endif 162 if (provider_types & AutocompleteProvider::TYPE_EXTENSION_APP) 163 providers_.push_back(new ExtensionAppProvider(this, profile)); 164 if (use_hqp) 165 providers_.push_back(new HistoryQuickProvider(this, profile)); 166 if (provider_types & AutocompleteProvider::TYPE_HISTORY_URL) { 167 history_url_provider_ = new HistoryURLProvider(this, profile); 168 providers_.push_back(history_url_provider_); 169 } 170 // Search provider/"tab to search" can be used on all platforms other than 171 // Android. 172 #if !defined(OS_ANDROID) 173 if (provider_types & AutocompleteProvider::TYPE_KEYWORD) { 174 keyword_provider_ = new KeywordProvider(this, profile); 175 providers_.push_back(keyword_provider_); 176 } 177 #endif 178 if (provider_types & AutocompleteProvider::TYPE_SEARCH) { 179 search_provider_ = new SearchProvider(this, profile); 180 providers_.push_back(search_provider_); 181 } 182 if (provider_types & AutocompleteProvider::TYPE_SHORTCUTS) 183 providers_.push_back(new ShortcutsProvider(this, profile)); 184 185 // Create ZeroSuggest if it is enabled. 186 if (provider_types & AutocompleteProvider::TYPE_ZERO_SUGGEST) { 187 zero_suggest_provider_ = ZeroSuggestProvider::Create(this, profile); 188 if (zero_suggest_provider_) 189 providers_.push_back(zero_suggest_provider_); 190 } 191 192 if ((provider_types & AutocompleteProvider::TYPE_BOOKMARK) && 193 !CommandLine::ForCurrentProcess()->HasSwitch( 194 switches::kDisableBookmarkAutocompleteProvider)) 195 providers_.push_back(new BookmarkProvider(this, profile)); 196 197 for (ACProviders::iterator i(providers_.begin()); i != providers_.end(); ++i) 198 (*i)->AddRef(); 199 } 200 201 AutocompleteController::~AutocompleteController() { 202 // The providers may have tasks outstanding that hold refs to them. We need 203 // to ensure they won't call us back if they outlive us. (Practically, 204 // calling Stop() should also cancel those tasks and make it so that we hold 205 // the only refs.) We also don't want to bother notifying anyone of our 206 // result changes here, because the notification observer is in the midst of 207 // shutdown too, so we don't ask Stop() to clear |result_| (and notify). 208 result_.Reset(); // Not really necessary. 209 Stop(false); 210 211 for (ACProviders::iterator i(providers_.begin()); i != providers_.end(); ++i) 212 (*i)->Release(); 213 214 providers_.clear(); // Not really necessary. 215 } 216 217 void AutocompleteController::Start(const AutocompleteInput& input) { 218 const string16 old_input_text(input_.text()); 219 const AutocompleteInput::MatchesRequested old_matches_requested = 220 input_.matches_requested(); 221 input_ = input; 222 223 // See if we can avoid rerunning autocomplete when the query hasn't changed 224 // much. When the user presses or releases the ctrl key, the desired_tld 225 // changes, and when the user finishes an IME composition, inline autocomplete 226 // may no longer be prevented. In both these cases the text itself hasn't 227 // changed since the last query, and some providers can do much less work (and 228 // get matches back more quickly). Taking advantage of this reduces flicker. 229 // 230 // NOTE: This comes after constructing |input_| above since that construction 231 // can change the text string (e.g. by stripping off a leading '?'). 232 const bool minimal_changes = (input_.text() == old_input_text) && 233 (input_.matches_requested() == old_matches_requested); 234 235 expire_timer_.Stop(); 236 stop_timer_.Stop(); 237 238 // Start the new query. 239 in_zero_suggest_ = false; 240 in_start_ = true; 241 base::TimeTicks start_time = base::TimeTicks::Now(); 242 for (ACProviders::iterator i(providers_.begin()); i != providers_.end(); 243 ++i) { 244 // TODO(mpearson): Remove timing code once bugs 178705 / 237703 / 168933 245 // are resolved. 246 base::TimeTicks provider_start_time = base::TimeTicks::Now(); 247 (*i)->Start(input_, minimal_changes); 248 if (input.matches_requested() != AutocompleteInput::ALL_MATCHES) 249 DCHECK((*i)->done()); 250 base::TimeTicks provider_end_time = base::TimeTicks::Now(); 251 std::string name = std::string("Omnibox.ProviderTime.") + (*i)->GetName(); 252 base::HistogramBase* counter = base::Histogram::FactoryGet( 253 name, 1, 5000, 20, base::Histogram::kUmaTargetedHistogramFlag); 254 counter->Add(static_cast<int>( 255 (provider_end_time - provider_start_time).InMilliseconds())); 256 } 257 if (input.matches_requested() == AutocompleteInput::ALL_MATCHES && 258 (input.text().length() < 6)) { 259 base::TimeTicks end_time = base::TimeTicks::Now(); 260 std::string name = "Omnibox.QueryTime." + base::IntToString( 261 input.text().length()); 262 base::HistogramBase* counter = base::Histogram::FactoryGet( 263 name, 1, 1000, 50, base::Histogram::kUmaTargetedHistogramFlag); 264 counter->Add(static_cast<int>((end_time - start_time).InMilliseconds())); 265 } 266 in_start_ = false; 267 CheckIfDone(); 268 // The second true forces saying the default match has changed. 269 // This triggers the edit model to update things such as the inline 270 // autocomplete state. In particular, if the user has typed a key 271 // since the last notification, and we're now re-running 272 // autocomplete, then we need to update the inline autocompletion 273 // even if the current match is for the same URL as the last run's 274 // default match. Likewise, the controller doesn't know what's 275 // happened in the edit since the last time it ran autocomplete. 276 // The user might have selected all the text and hit delete, then 277 // typed a new character. The selection and delete won't send any 278 // signals to the controller so it doesn't realize that anything was 279 // cleared or changed. Even if the default match hasn't changed, we 280 // need the edit model to update the display. 281 UpdateResult(false, true); 282 283 if (!done_) { 284 StartExpireTimer(); 285 StartStopTimer(); 286 } 287 } 288 289 void AutocompleteController::Stop(bool clear_result) { 290 for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end(); 291 ++i) { 292 (*i)->Stop(clear_result); 293 } 294 295 expire_timer_.Stop(); 296 stop_timer_.Stop(); 297 done_ = true; 298 if (clear_result && !result_.empty()) { 299 result_.Reset(); 300 // NOTE: We pass in false since we're trying to only clear the popup, not 301 // touch the edit... this is all a mess and should be cleaned up :( 302 NotifyChanged(false); 303 } 304 } 305 306 void AutocompleteController::StartZeroSuggest( 307 const GURL& url, 308 AutocompleteInput::PageClassification page_classification, 309 const string16& permanent_text) { 310 if (zero_suggest_provider_ != NULL) { 311 DCHECK(!in_start_); // We should not be already running a query. 312 in_zero_suggest_ = true; 313 zero_suggest_provider_->StartZeroSuggest( 314 url, page_classification, permanent_text); 315 } 316 } 317 318 void AutocompleteController::StopZeroSuggest() { 319 if (zero_suggest_provider_ != NULL) { 320 DCHECK(!in_start_); // We should not be already running a query. 321 zero_suggest_provider_->Stop(false); 322 } 323 } 324 325 void AutocompleteController::DeleteMatch(const AutocompleteMatch& match) { 326 DCHECK(match.deletable); 327 match.provider->DeleteMatch(match); // This may synchronously call back to 328 // OnProviderUpdate(). 329 // If DeleteMatch resulted in a callback to OnProviderUpdate and we're 330 // not done, we might attempt to redisplay the deleted match. Make sure 331 // we aren't displaying it by removing any old entries. 332 ExpireCopiedEntries(); 333 } 334 335 void AutocompleteController::ExpireCopiedEntries() { 336 // The first true makes UpdateResult() clear out the results and 337 // regenerate them, thus ensuring that no results from the previous 338 // result set remain. 339 UpdateResult(true, false); 340 } 341 342 void AutocompleteController::OnProviderUpdate(bool updated_matches) { 343 if (in_zero_suggest_) { 344 // We got ZeroSuggest results before Start(). Show only those results, 345 // because results from other providers are stale. 346 result_.Reset(); 347 result_.AppendMatches(zero_suggest_provider_->matches()); 348 result_.SortAndCull(input_, profile_); 349 UpdateAssistedQueryStats(&result_); 350 NotifyChanged(true); 351 } else { 352 CheckIfDone(); 353 // Multiple providers may provide synchronous results, so we only update the 354 // results if we're not in Start(). 355 if (!in_start_ && (updated_matches || done_)) 356 UpdateResult(false, false); 357 } 358 } 359 360 void AutocompleteController::AddProvidersInfo( 361 ProvidersInfo* provider_info) const { 362 provider_info->clear(); 363 for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end(); 364 ++i) { 365 // Add per-provider info, if any. 366 (*i)->AddProviderInfo(provider_info); 367 368 // This is also a good place to put code to add info that you want to 369 // add for every provider. 370 } 371 } 372 373 void AutocompleteController::ResetSession() { 374 for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end(); 375 ++i) 376 (*i)->ResetSession(); 377 in_zero_suggest_ = false; 378 } 379 380 void AutocompleteController::UpdateResult( 381 bool regenerate_result, 382 bool force_notify_default_match_changed) { 383 const bool last_default_was_valid = result_.default_match() != result_.end(); 384 // The following three variables are only set and used if 385 // |last_default_was_valid|. 386 string16 last_default_fill_into_edit, last_default_keyword, 387 last_default_associated_keyword; 388 if (last_default_was_valid) { 389 last_default_fill_into_edit = result_.default_match()->fill_into_edit; 390 last_default_keyword = result_.default_match()->keyword; 391 if (result_.default_match()->associated_keyword != NULL) 392 last_default_associated_keyword = 393 result_.default_match()->associated_keyword->keyword; 394 } 395 396 if (regenerate_result) 397 result_.Reset(); 398 399 AutocompleteResult last_result; 400 last_result.Swap(&result_); 401 402 for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end(); 403 ++i) 404 result_.AppendMatches((*i)->matches()); 405 406 // Sort the matches and trim to a small number of "best" matches. 407 result_.SortAndCull(input_, profile_); 408 409 // Need to validate before invoking CopyOldMatches as the old matches are not 410 // valid against the current input. 411 #ifndef NDEBUG 412 result_.Validate(); 413 #endif 414 415 if (!done_) { 416 // This conditional needs to match the conditional in Start that invokes 417 // StartExpireTimer. 418 result_.CopyOldMatches(input_, last_result, profile_); 419 } 420 421 UpdateKeywordDescriptions(&result_); 422 UpdateAssociatedKeywords(&result_); 423 UpdateAssistedQueryStats(&result_); 424 425 const bool default_is_valid = result_.default_match() != result_.end(); 426 string16 default_associated_keyword; 427 if (default_is_valid && 428 (result_.default_match()->associated_keyword != NULL)) { 429 default_associated_keyword = 430 result_.default_match()->associated_keyword->keyword; 431 } 432 // We've gotten async results. Send notification that the default match 433 // updated if fill_into_edit, associated_keyword, or keyword differ. (The 434 // second can change if we've just started Chrome and the keyword database 435 // finishes loading while processing this request. The third can change 436 // if we swapped from interpreting the input as a search--which gets 437 // labeled with the default search provider's keyword--to a URL.) 438 // We don't check the URL as that may change for the default match 439 // even though the fill into edit hasn't changed (see SearchProvider 440 // for one case of this). 441 const bool notify_default_match = 442 (last_default_was_valid != default_is_valid) || 443 (last_default_was_valid && 444 ((result_.default_match()->fill_into_edit != 445 last_default_fill_into_edit) || 446 (default_associated_keyword != last_default_associated_keyword) || 447 (result_.default_match()->keyword != last_default_keyword))); 448 if (notify_default_match) 449 last_time_default_match_changed_ = base::TimeTicks::Now(); 450 451 NotifyChanged(force_notify_default_match_changed || notify_default_match); 452 } 453 454 void AutocompleteController::UpdateAssociatedKeywords( 455 AutocompleteResult* result) { 456 if (!keyword_provider_) 457 return; 458 459 std::set<string16> keywords; 460 for (ACMatches::iterator match(result->begin()); match != result->end(); 461 ++match) { 462 string16 keyword(match->GetSubstitutingExplicitlyInvokedKeyword(profile_)); 463 if (!keyword.empty()) { 464 keywords.insert(keyword); 465 continue; 466 } 467 468 // Only add the keyword if the match does not have a duplicate keyword with 469 // a more relevant match. 470 keyword = match->associated_keyword.get() ? 471 match->associated_keyword->keyword : 472 keyword_provider_->GetKeywordForText(match->fill_into_edit); 473 if (!keyword.empty() && !keywords.count(keyword)) { 474 keywords.insert(keyword); 475 476 if (!match->associated_keyword.get()) 477 match->associated_keyword.reset(new AutocompleteMatch( 478 keyword_provider_->CreateVerbatimMatch(match->fill_into_edit, 479 keyword, input_))); 480 } else { 481 match->associated_keyword.reset(); 482 } 483 } 484 } 485 486 void AutocompleteController::UpdateAssistedQueryStats( 487 AutocompleteResult* result) { 488 if (result->empty()) 489 return; 490 491 // Build the impressions string (the AQS part after "."). 492 std::string autocompletions; 493 int count = 0; 494 size_t last_type = string16::npos; 495 size_t last_subtype = string16::npos; 496 for (ACMatches::iterator match(result->begin()); match != result->end(); 497 ++match) { 498 size_t type = string16::npos; 499 size_t subtype = string16::npos; 500 AutocompleteMatchToAssistedQuery(match->type, &type, &subtype); 501 if (last_type != string16::npos && 502 (type != last_type || subtype != last_subtype)) { 503 AppendAvailableAutocompletion( 504 last_type, last_subtype, count, &autocompletions); 505 count = 1; 506 } else { 507 count++; 508 } 509 last_type = type; 510 last_subtype = subtype; 511 } 512 AppendAvailableAutocompletion( 513 last_type, last_subtype, count, &autocompletions); 514 // Go over all matches and set AQS if the match supports it. 515 for (size_t index = 0; index < result->size(); ++index) { 516 AutocompleteMatch* match = result->match_at(index); 517 const TemplateURL* template_url = match->GetTemplateURL(profile_, false); 518 if (!template_url || !match->search_terms_args.get()) 519 continue; 520 std::string selected_index; 521 // Prevent trivial suggestions from getting credit for being selected. 522 if (!IsTrivialAutocompletion(*match)) 523 selected_index = base::StringPrintf("%" PRIuS, index); 524 match->search_terms_args->assisted_query_stats = 525 base::StringPrintf("chrome.%s.%s", 526 selected_index.c_str(), 527 autocompletions.c_str()); 528 match->destination_url = GURL(template_url->url_ref().ReplaceSearchTerms( 529 *match->search_terms_args)); 530 } 531 } 532 533 GURL AutocompleteController::GetDestinationURL( 534 const AutocompleteMatch& match, 535 base::TimeDelta query_formulation_time) const { 536 GURL destination_url(match.destination_url); 537 TemplateURL* template_url = match.GetTemplateURL(profile_, false); 538 539 // Append the query formulation time (time from when the user first typed a 540 // character into the omnibox to when the user selected a query) and whether 541 // a field trial has triggered to the AQS parameter, if other AQS parameters 542 // were already populated. 543 if (template_url && match.search_terms_args.get() && 544 !match.search_terms_args->assisted_query_stats.empty()) { 545 TemplateURLRef::SearchTermsArgs search_terms_args(*match.search_terms_args); 546 search_terms_args.assisted_query_stats += base::StringPrintf( 547 ".%" PRId64 "j%dj%d", 548 query_formulation_time.InMilliseconds(), 549 (search_provider_ && 550 search_provider_->field_trial_triggered_in_session()) || 551 (zero_suggest_provider_ && 552 zero_suggest_provider_->field_trial_triggered_in_session()), 553 input_.current_page_classification()); 554 destination_url = GURL(template_url->url_ref(). 555 ReplaceSearchTerms(search_terms_args)); 556 } 557 return destination_url; 558 } 559 560 void AutocompleteController::UpdateKeywordDescriptions( 561 AutocompleteResult* result) { 562 string16 last_keyword; 563 for (AutocompleteResult::iterator i(result->begin()); i != result->end(); 564 ++i) { 565 if ((i->provider->type() == AutocompleteProvider::TYPE_KEYWORD && 566 !i->keyword.empty()) || 567 (i->provider->type() == AutocompleteProvider::TYPE_SEARCH && 568 AutocompleteMatch::IsSearchType(i->type))) { 569 i->description.clear(); 570 i->description_class.clear(); 571 DCHECK(!i->keyword.empty()); 572 if (i->keyword != last_keyword) { 573 const TemplateURL* template_url = i->GetTemplateURL(profile_, false); 574 if (template_url) { 575 // For extension keywords, just make the description the extension 576 // name -- don't assume that the normal search keyword description is 577 // applicable. 578 i->description = template_url->AdjustedShortNameForLocaleDirection(); 579 if (!template_url->IsExtensionKeyword()) { 580 i->description = l10n_util::GetStringFUTF16( 581 IDS_AUTOCOMPLETE_SEARCH_DESCRIPTION, i->description); 582 } 583 i->description_class.push_back( 584 ACMatchClassification(0, ACMatchClassification::DIM)); 585 } 586 last_keyword = i->keyword; 587 } 588 } else { 589 last_keyword.clear(); 590 } 591 } 592 } 593 594 void AutocompleteController::NotifyChanged(bool notify_default_match) { 595 if (delegate_) 596 delegate_->OnResultChanged(notify_default_match); 597 if (done_) { 598 content::NotificationService::current()->Notify( 599 chrome::NOTIFICATION_AUTOCOMPLETE_CONTROLLER_RESULT_READY, 600 content::Source<AutocompleteController>(this), 601 content::NotificationService::NoDetails()); 602 } 603 } 604 605 void AutocompleteController::CheckIfDone() { 606 for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end(); 607 ++i) { 608 if (!(*i)->done()) { 609 done_ = false; 610 return; 611 } 612 } 613 done_ = true; 614 } 615 616 void AutocompleteController::StartExpireTimer() { 617 // Amount of time (in ms) between when the user stops typing and 618 // when we remove any copied entries. We do this from the time the 619 // user stopped typing as some providers (such as SearchProvider) 620 // wait for the user to stop typing before they initiate a query. 621 const int kExpireTimeMS = 500; 622 623 if (result_.HasCopiedMatches()) 624 expire_timer_.Start(FROM_HERE, 625 base::TimeDelta::FromMilliseconds(kExpireTimeMS), 626 this, &AutocompleteController::ExpireCopiedEntries); 627 } 628 629 void AutocompleteController::StartStopTimer() { 630 if (!in_stop_timer_field_trial_) 631 return; 632 633 // Amount of time (in ms) between when the user stops typing and 634 // when we send Stop() to every provider. This is intended to avoid 635 // the disruptive effect of belated omnibox updates, updates that 636 // come after the user has had to time to read the whole dropdown 637 // and doesn't expect it to change. 638 const int kStopTimeMS = 1500; 639 stop_timer_.Start(FROM_HERE, 640 base::TimeDelta::FromMilliseconds(kStopTimeMS), 641 base::Bind(&AutocompleteController::Stop, 642 base::Unretained(this), 643 false)); 644 } 645