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// Copyright (c) 2011 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_
#pragma once
#include <string>
#include <vector>
#include "chrome/browser/history/history_types.h"
#include "content/browser/cancelable_request.h"
#include "content/browser/webui/web_ui.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class GURL;
class PageUsageData;
class PrefService;
namespace base {
class ListValue;
class Value;
}
// The handler for Javascript messages related to the "most visited" view.
//
// This class manages two preferences:
// - 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).
// - Pinned URLs: This is a dictionary for the pinned URLs for the the most
// visited part of the new tab page. The key of the dictionary is a hash of
// the URL and the value is a dictionary with title, url and index. This is
// owned by the PrefService.
class MostVisitedHandler : public WebUIMessageHandler,
public content::NotificationObserver {
public:
MostVisitedHandler();
virtual ~MostVisitedHandler();
// WebUIMessageHandler override and implementation.
virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
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 "addPinnedURL" message.
void HandleAddPinnedURL(const base::ListValue* args);
// Callback for the "removePinnedURL" message.
void HandleRemovePinnedURL(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 RegisterUserPrefs(PrefService* prefs);
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_ and pinned_urls_ for the passed
// |url|.
std::string GetDictionaryKeyForURL(const std::string& url);
// Gets the page data for a pinned URL at a given index. This returns
// true if found.
bool GetPinnedURLAtIndex(int index, MostVisitedPage* page);
void AddPinnedURL(const MostVisitedPage& page, int index);
void RemovePinnedURL(const GURL& url);
// Sends pages_value_ to the javascript side to and resets page_value_.
void SendPagesValue();
content::NotificationRegistrar registrar_;
// Our consumer for the history service.
CancelableRequestConsumerTSimple<PageUsageData*> cancelable_consumer_;
CancelableRequestConsumer topsites_consumer_;
// 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_;
DISALLOW_COPY_AND_ASSIGN(MostVisitedHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
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