Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_controller_impl.cc

Index: chrome/browser/instant/instant_controller_impl.cc
diff --git a/chrome/browser/instant/instant_controller_impl.cc b/chrome/browser/instant/instant_controller_impl.cc
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--- /dev/null
+++ b/chrome/browser/instant/instant_controller_impl.cc
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/instant/instant_controller_impl.h"
+
+#include "base/string_util.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/autocomplete/autocomplete_match.h"
+#include "chrome/browser/history/history_service.h"
+#include "chrome/browser/history/history_service_factory.h"
+#include "chrome/browser/instant/instant_controller_utils.h"
+#include "chrome/browser/instant/instant_overlay.h"
+#include "chrome/browser/instant/instant_overlay_model.h"
+#include "chrome/browser/instant/instant_preloader.h"
+#include "chrome/browser/instant/instant_service.h"
+#include "chrome/browser/instant/instant_service_factory.h"
+#include "chrome/browser/ui/browser_instant_controller.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_contents.h"
+
+#if defined(OS_MACOSX)
+#include "content/public/browser/render_widget_host_view.h"
+#endif
+
+namespace {
+
+// An artificial delay (in milliseconds) we introduce before telling the Instant
+// page about the new omnibox bounds, in cases where the bounds shrink. This is
+// to avoid the page jumping up/down very fast in response to bounds changes.
+const int kUpdateBoundsDelayMS = 1000;
+
+}  // namespace
+
+InstantControllerImpl::InstantControllerImpl(
+    chrome::BrowserInstantController* browser,
+    Profile* profile)
+    : browser_(browser),
+      service_(InstantServiceFactory::GetForProfile(profile)),
+      last_verbatim_(false),
+      last_transition_type_(content::PAGE_TRANSITION_LINK) {
+  service_->AddObserver(this);
+  model_.reset(new InstantOverlayModel(service_));
+}
+
+InstantControllerImpl::~InstantControllerImpl() {
+  service_->RemoveObserver(this);
+}
+
+bool InstantControllerImpl::Update(const AutocompleteMatch& match,
+                                   const string16& user_text,
+                                   const string16& full_text,
+                                   size_t selection_start,
+                                   size_t selection_end,
+                                   bool verbatim,
+                                   bool /* user_input_in_progress */,
+                                   bool omnibox_popup_is_open,
+                                   bool /* escape_pressed */,
+                                   bool is_keyword_search) {
+  // If the overlay is being committed, don't change anything.
+  // TODO(sreeram): Add a browser test for this.
+  if (IsOverlayBeingCommitted())
+    return false;
+
+  // No overlay for URLs and keyword searches or if the user isn't typing.
+  if (!AutocompleteMatch::IsSearchType(match.type) || is_keyword_search ||
+      !omnibox_popup_is_open || user_text.empty() || full_text.empty()) {
+    HideOverlay();
+    return false;
+  }
+
+  if (!overlay_) {
+    // If we don't have a valid (Instant-supporting) web contents ready, bail.
+    if (!service_->preloader()->supports_instant())
+      return false;
+
+    overlay_.reset(new InstantOverlay(
+        this, service_, service_->preloader()->ReleaseContents()));
+  }
+
+  // Query is verbatim not only when |verbatim| is true (which indicates that
+  // the user pressed Delete/Backspace), but also when there's any selection
+  // (including inline autocompletion) or if the cursor is not at the end.
+  verbatim = verbatim || selection_start != selection_end ||
+                         selection_start != full_text.size();
+
+  last_omnibox_text_ = full_text;
+  last_verbatim_ = verbatim;
+  last_transition_type_ = match.transition;
+  url_for_history_ = match.destination_url;
+
+  service_->LogDebugEvent(base::StringPrintf("%p Update '%s' %s [%d,%d]",
+                              this,
+                              UTF16ToUTF8(last_omnibox_text_).c_str(),
+                              verbatim ? "verbatim" : "psychic",
+                              static_cast<int>(selection_start),
+                              static_cast<int>(selection_end)));
+
+  overlay_->page()->Change(full_text, verbatim, selection_start, selection_end);
+
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_INSTANT_UPDATED,
+      content::NotificationService::AllSources(),
+      content::NotificationService::NoDetails());
+
+  return true;
+}
+
+void InstantControllerImpl::HandleAutocompleteResults(
+    const std::vector<AutocompleteProvider*>& /* providers */) {
+}
+
+bool InstantControllerImpl::OnUpOrDownKeyPressed(int /* count */) {
+  return false;
+}
+
+void InstantControllerImpl::OnCancel(const AutocompleteMatch& /* match */,
+                                     const string16& /* full_text */) {
+}
+
+bool InstantControllerImpl::IsOverlayingSearchResults() const {
+  return model_->contents() != NULL;
+}
+
+content::WebContents* InstantControllerImpl::GetOverlayContents() const {
+  return overlay_ ? overlay_->contents() : NULL;
+}
+
+const InstantOverlayModel* InstantControllerImpl::model() const {
+  return model_.get();
+}
+
+void InstantControllerImpl::AddOverlayModelObserver(
+    InstantOverlayModelObserver* observer) {
+  model_->AddObserver(observer);
+}
+
+void InstantControllerImpl::RemoveOverlayModelObserver(
+    InstantOverlayModelObserver* observer) {
+  model_->RemoveObserver(observer);
+}
+
+bool InstantControllerImpl::CommitIfPossible(InstantCommitType type) {
+  if (!IsOverlayingSearchResults())
+    return false;
+
+  service_->LogDebugEvent(base::StringPrintf("%p CommitIfPossible '%s' %s",
+      this,
+      UTF16ToUTF8(last_omnibox_text_).c_str(),
+      InstantControllerUtils::CommitTypeToString(type).c_str()));
+
+  if (type == INSTANT_COMMIT_FOCUS_LOST)
+    overlay_->page()->Blur(last_omnibox_text_);
+  else if (type != INSTANT_COMMIT_NAVIGATED)
+    overlay_->page()->Submit(last_omnibox_text_);
+
+  HistoryService* history = HistoryServiceFactory::GetForProfile(
+      service_->profile(), Profile::EXPLICIT_ACCESS);
+  if (history) {
+    history->AddPage(url_for_history_, base::Time::Now(), NULL, 0, GURL(),
+                     history::RedirectList(), last_transition_type_,
+                     history::SOURCE_BROWSED, false);
+
+    if (overlay_->page()->navigated_after_change() ||
+        type == INSTANT_COMMIT_NAVIGATED) {
+      content::NavigationEntry* entry =
+          GetOverlayContents()->GetController().GetLastCommittedEntry();
+      history->AddPage(entry->GetVirtualURL(), base::Time::Now(),
+                       history::SOURCE_BROWSED);
+      history->SetPageTitle(entry->GetVirtualURL(),
+                            entry->GetTitleForDisplay(""));
+    }
+  }
+
+  scoped_ptr<content::WebContents> contents = overlay_->ReleaseContents();
+
+  if (type == INSTANT_COMMIT_PRESSED_ALT_ENTER) {
+    contents->GetController().PruneAllButActive();
+  } else {
+    content::WebContents* active_tab = browser_->GetActiveWebContents();
+    contents->GetController().CopyStateFromAndPrune(
+        &active_tab->GetController());
+  }
+
+  browser_->CommitInstant(contents.Pass(), last_transition_type_,
+                          type == INSTANT_COMMIT_PRESSED_ALT_ENTER);
+
+  service_->LogDebugEvent(base::StringPrintf("%p Committed", this));
+
+  HideOverlay();
+
+  return true;
+}
+
+scoped_ptr<content::WebContents> InstantControllerImpl::ReleaseNTPContents() {
+  return scoped_ptr<content::WebContents>();
+}
+
+// TODO(tonyg): This method only fires when the popup bounds change. It also
+// needs to fire when the overlay bounds change (e.g.: open/close info bar).
+void InstantControllerImpl::SetPopupBounds(const gfx::Rect& bounds) {
+  if (popup_bounds_ == bounds)
+    return;
+
+  popup_bounds_ = bounds;
+
+  if (bounds.height() > last_popup_bounds_.height()) {
+    update_bounds_timer_.Stop();
+    SendPopupBoundsToPage();
+  } else if (!update_bounds_timer_.IsRunning()) {
+    update_bounds_timer_.Start(FROM_HERE,
+        base::TimeDelta::FromMilliseconds(kUpdateBoundsDelayMS),
+        this, &InstantControllerImpl::SendPopupBoundsToPage);
+  }
+}
+
+void InstantControllerImpl::SetOmniboxBounds(const gfx::Rect& /* bounds */) {
+}
+
+void InstantControllerImpl::OmniboxFocusChanged(
+    OmniboxFocusState state,
+    OmniboxFocusChangeReason reason,
+    gfx::NativeView view_gaining_focus) {
+
+  service_->LogDebugEvent(base::StringPrintf("%p OmniboxFocus %s due to %s",
+      this,
+      InstantControllerUtils::FocusStateToString(state).c_str(),
+      InstantControllerUtils::FocusChangeReasonToString(reason).c_str()));
+
+  if (state == OMNIBOX_FOCUS_NONE) {
+    // Don't do anything if we don't have an overlay or if the overlay isn't
+    // showing or if we are in the midst of committing the overlay.
+    if (!overlay_ || !IsOverlayingSearchResults() || IsOverlayBeingCommitted())
+      return;
+
+    view_gaining_focus =
+        InstantControllerUtils::GetViewGainingFocus(view_gaining_focus);
+    if (InstantControllerUtils::IsViewInContents(view_gaining_focus,
+                                                 GetOverlayContents()))
+      CommitIfPossible(INSTANT_COMMIT_FOCUS_LOST);
+    else
+      HideOverlay();
+  } else {
+    service_->preloader()->InitContents();
+  }
+}
+
+void InstantControllerImpl::TabDeactivated(
+    content::WebContents* /* contents */) {
+  if (GetOverlayContents())
+    HideOverlay();
+}
+
+void InstantControllerImpl::SearchModeChanged(
+    const chrome::search::Mode& /* old_mode */,
+    const chrome::search::Mode& /* new_mode */) {
+}
+
+void InstantControllerImpl::ActiveTabChanged() {
+}
+
+void InstantControllerImpl::SwappedOverlayContents() {
+  if (IsOverlayingSearchResults())
+    ShowOverlay();
+}
+
+void InstantControllerImpl::FocusedOverlayContents() {
+  if (IsOverlayingSearchResults())
+    browser_->InstantOverlayFocused();
+}
+
+void InstantControllerImpl::RenderViewGone(
+    const content::WebContents* /* contents */) {
+  HideOverlay();
+}
+
+void InstantControllerImpl::InitSearchBox(
+    const content::WebContents* /* contents */) {
+}
+
+void InstantControllerImpl::InstantSupportDetermined(
+    const content::WebContents* /* contents */) {
+  if (!overlay_->page()->supports_instant())
+    HideOverlay();
+  service_->InstantSupportDetermined();
+}
+
+void InstantControllerImpl::SetSuggestion(
+    const content::WebContents* /* contents */,
+    const InstantSuggestion& suggestion) {
+  string16 text = suggestion.text;
+
+  if (StartsWith(text, last_omnibox_text_, true)) {
+    text.erase(0, last_omnibox_text_.size());
+  } else if (!InstantControllerUtils::NormalizeAndStripPrefix(
+                  &text, last_omnibox_text_)) {
+    text.clear();
+  }
+
+  if (last_verbatim_)
+    text.clear();
+
+  if (!text.empty()) {
+    service_->LogDebugEvent(base::StringPrintf("%p SetSuggestion '%s'",
+                                               this,
+                                               UTF16ToUTF8(text).c_str()));
+    browser_->SetInstantSuggestion(InstantSuggestion(
+        text, INSTANT_COMPLETE_NOW, INSTANT_SUGGESTION_SEARCH));
+  }
+
+  ShowOverlay();
+}
+
+void InstantControllerImpl::NavigateToURL(
+    const content::WebContents* /* contents */,
+    const GURL& /* url */,
+    content::PageTransition /* transition */,
+    WindowOpenDisposition /* disposition */) {
+}
+
+void InstantControllerImpl::ShowOverlay(
+    const content::WebContents* /* contents */,
+    int /* height */,
+    InstantSizeUnits /* height_units */) {
+}
+
+void InstantControllerImpl::SetFocusState(
+    const content::WebContents* /* contents */,
+    OmniboxFocusState /* focus_state */) {
+}
+
+void InstantControllerImpl::DeleteMostVisitedItem(
+    const content::WebContents* /* contents */,
+    const GURL& /* url */) {
+}
+
+void InstantControllerImpl::UndoMostVisitedItemDeletion(
+    const content::WebContents* /* contents */,
+    const GURL& /* url */) {
+}
+
+void InstantControllerImpl::UndoAllMostVisitedItemDeletions(
+    const content::WebContents* /* contents */) {
+}
+
+void InstantControllerImpl::InstantStatusChanged() {
+  HideOverlay();
+}
+
+void InstantControllerImpl::ThemeInfoChanged() {
+}
+
+void InstantControllerImpl::MostVisitedItemsChanged() {
+}
+
+bool InstantControllerImpl::IsOverlayBeingCommitted() const {
+  return (overlay_ && overlay_->is_pointer_down_from_activate()) ||
+         (IsOverlayingSearchResults() && !GetOverlayContents());
+}
+
+void InstantControllerImpl::ShowOverlay() {
+#if defined(OS_MACOSX)
+  content::RenderWidgetHostView* rwhv =
+      GetOverlayContents()->GetRenderWidgetHostView();
+  if (rwhv)
+    rwhv->SetTakesFocusOnlyOnMouseDown(true);
+#endif
+  model_->SetOverlayState(GetOverlayContents(), 100, INSTANT_SIZE_PERCENT);
+}
+
+void InstantControllerImpl::HideOverlay() {
+  model_->SetOverlayState(NULL, 0, INSTANT_SIZE_PIXELS);
+  last_popup_bounds_ = gfx::Rect();
+  if (overlay_) {
+    overlay_->ReleaseContents();
+    MessageLoop::current()->DeleteSoon(FROM_HERE, overlay_.release());
+  }
+}
+
+void InstantControllerImpl::SendPopupBoundsToPage() {
+  if (!overlay_ || last_popup_bounds_ == popup_bounds_ ||
+      overlay_->is_pointer_down_from_activate())
+    return;
+
+  last_popup_bounds_ = popup_bounds_;
+
+  gfx::Rect overlay_bounds = browser_->GetInstantBounds();
+  gfx::Rect intersection = gfx::IntersectRects(popup_bounds_, overlay_bounds);
+
+  // Translate into window coordinates.
+  if (!intersection.IsEmpty()) {
+    intersection.Offset(-overlay_bounds.origin().x(),
+                        -overlay_bounds.origin().y());
+  }
+
+  // In the current Chrome UI, these must always be true so they sanity check
+  // the above operations. In a future UI, these may be removed or adjusted.
+  // There is no point in sanity-checking intersection.y() because the omnibox
+  // can be placed anywhere vertically relative to the overlay (for example, in
+  // Mac fullscreen mode, the omnibox is fully enclosed by the overlay bounds).
+  DCHECK_LE(0, intersection.x());
+  DCHECK_LE(0, intersection.width());
+  DCHECK_LE(0, intersection.height());
+
+  overlay_->page()->PopupBounds(intersection);
+}