chrome/browser/ui/search/instant_controller.cc

// Copyright 2012 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/ui/search/instant_controller.h"

#include <stddef.h>
#include <utility>

#include "base/location.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search/instant_service.h"
#include "chrome/browser/search/instant_service_factory.h"
#include "chrome/browser/ui/browser_instant_controller.h"
#include "content/public/browser/web_contents.h"
#include "url/gurl.h"

namespace {

bool IsContentsFrom(const InstantTab* page,
                    const content::WebContents* contents) {
  return page && (page->web_contents() == contents);
}

}  // namespace

InstantController::InstantController(BrowserInstantController* browser)
    : browser_(browser) {
}

InstantController::~InstantController() {
}

void InstantController::SearchModeChanged(const SearchMode& old_mode,
                                          const SearchMode& new_mode) {
  LogDebugEvent(base::StringPrintf(
      "SearchModeChanged: [origin:mode] %d:%d to %d:%d", old_mode.origin,
      old_mode.mode, new_mode.origin, new_mode.mode));

  search_mode_ = new_mode;
  ResetInstantTab();
}

void InstantController::ActiveTabChanged() {
  LogDebugEvent("ActiveTabChanged");
  ResetInstantTab();
}

void InstantController::LogDebugEvent(const std::string& info) const {
  DVLOG(1) << info;

  debug_events_.push_front(std::make_pair(
      base::Time::Now().ToInternalValue(), info));
  static const size_t kMaxDebugEventSize = 2000;
  if (debug_events_.size() > kMaxDebugEventSize)
    debug_events_.pop_back();
}

void InstantController::ClearDebugEvents() {
  debug_events_.clear();
}

void InstantController::InstantSupportChanged(
    InstantSupportState instant_support) {
  // Handle INSTANT_SUPPORT_YES here because InstantTab is not hooked up to the
  // active tab. Search model changed listener in InstantTab will handle other
  // cases.
  if (instant_support != INSTANT_SUPPORT_YES)
    return;

  ResetInstantTab();
}

void InstantController::InstantSupportDetermined(
    const content::WebContents* contents,
    bool supports_instant) {
  DCHECK(IsContentsFrom(instant_tab_.get(), contents));

  if (!supports_instant) {
    base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE,
                                                    instant_tab_.release());
  }
}

void InstantController::InstantTabAboutToNavigateMainFrame(
    const content::WebContents* contents,
    const GURL& url) {
  DCHECK(IsContentsFrom(instant_tab_.get(), contents));

  // The Instant tab navigated.  Send it the data it needs to display
  // properly.
  UpdateInfoForInstantTab();
}

void InstantController::ResetInstantTab() {
  if (!search_mode_.is_origin_default()) {
    content::WebContents* active_tab = browser_->GetActiveWebContents();
    if (!instant_tab_ || active_tab != instant_tab_->web_contents()) {
      instant_tab_.reset(new InstantTab(this, active_tab));
      instant_tab_->Init();
      UpdateInfoForInstantTab();
    }
  } else {
    instant_tab_.reset();
  }
}

void InstantController::UpdateInfoForInstantTab() {
  if (instant_tab_) {
    // Update theme details.
    InstantService* instant_service = GetInstantService();
    if (instant_service) {
      instant_service->UpdateThemeInfo();
      instant_service->UpdateMostVisitedItemsInfo();
    }
  }
}

InstantService* InstantController::GetInstantService() const {
  return InstantServiceFactory::GetForProfile(browser_->profile());
}