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// Copyright (c) 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.
#ifndef CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
#include <string>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "chrome/browser/common/cancelable_request.h"
#include "chrome/browser/history/history_types.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_ui_message_handler.h"
class GURL;
class PageUsageData;
namespace base {
class ListValue;
class Value;
}
namespace user_prefs {
class PrefRegistrySyncable;
}
// The handler for Javascript messages related to the "most visited" view.
//
// This class manages one preference:
// - The URL blacklist: URLs we do not want to show in the thumbnails list. It
// is a dictionary for quick access (it associates a dummy boolean to the URL
// string).
class MostVisitedHandler : public content::WebUIMessageHandler,
public content::NotificationObserver {
public:
MostVisitedHandler();
virtual ~MostVisitedHandler();
// WebUIMessageHandler override and implementation.
virtual void RegisterMessages() OVERRIDE;
// Callback for the "getMostVisited" message.
void HandleGetMostVisited(const base::ListValue* args);
// Callback for the "blacklistURLFromMostVisited" message.
void HandleBlacklistUrl(const base::ListValue* args);
// Callback for the "removeURLsFromMostVisitedBlacklist" message.
void HandleRemoveUrlsFromBlacklist(const base::ListValue* args);
// Callback for the "clearMostVisitedURLsBlacklist" message.
void HandleClearBlacklist(const base::ListValue* args);
// Callback for the "mostVisitedAction" message.
void HandleMostVisitedAction(const base::ListValue* args);
// Callback for the "mostVisitedSelected" message.
void HandleMostVisitedSelected(const base::ListValue* args);
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
const std::vector<GURL>& most_visited_urls() const {
return most_visited_urls_;
}
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
private:
struct MostVisitedPage;
// Send a request to the HistoryService to get the most visited pages.
void StartQueryForMostVisited();
// Sets pages_value_ from a format produced by TopSites.
void SetPagesValueFromTopSites(const history::MostVisitedURLList& data);
// Callback for TopSites.
void OnMostVisitedUrlsAvailable(const history::MostVisitedURLList& data);
// Puts the passed URL in the blacklist (so it does not show as a thumbnail).
void BlacklistUrl(const GURL& url);
// Returns the key used in url_blacklist_ for the passed |url|.
std::string GetDictionaryKeyForUrl(const std::string& url);
// Removes recommended URLs if a matching URL is already open in the Browser,
// if the Most Visited Tile Placement experiment is enabled, and the client is
// in the experiment group.
void MaybeRemovePageValues();
// Sends pages_value_ to the javascript side and resets page_value_.
void SendPagesValue();
content::NotificationRegistrar registrar_;
// For callbacks may be run after destruction.
base::WeakPtrFactory<MostVisitedHandler> weak_ptr_factory_;
// The most visited URLs, in priority order.
// Only used for matching up clicks on the page to which most visited entry
// was clicked on for metrics purposes.
std::vector<GURL> most_visited_urls_;
// We pre-fetch the first set of result pages. This variable is false until
// we get the first getMostVisited() call.
bool got_first_most_visited_request_;
// Keep the results of the db query here.
scoped_ptr<base::ListValue> pages_value_;
// Whether the user has viewed the 'most visited' pane.
bool most_visited_viewed_;
// Whether the user has performed a "tracked" action to leave the page or not.
bool user_action_logged_;
DISALLOW_COPY_AND_ASSIGN(MostVisitedHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
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