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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_SUGGESTIONS_PAGE_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_PAGE_HANDLER_H_
#include <string>
#include "chrome/browser/common/cancelable_request.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/browser/ui/webui/ntp/suggestions_combiner.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 "suggestions" 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 SuggestionsHandler : public content::WebUIMessageHandler,
public content::NotificationObserver,
public SuggestionsCombiner::Delegate {
public:
SuggestionsHandler();
virtual ~SuggestionsHandler();
// WebUIMessageHandler override and implementation.
virtual void RegisterMessages() OVERRIDE;
// Callback for the "getSuggestions" message.
void HandleGetSuggestions(const base::ListValue* args);
// Callback for the "blacklistURLFromSuggestions" message.
void HandleBlacklistURL(const base::ListValue* args);
// Callback for the "removeURLsFromSuggestionsBlacklist" message.
void HandleRemoveURLsFromBlacklist(const base::ListValue* args);
// Callback for the "clearSuggestionsURLsBlacklist" message.
void HandleClearBlacklist(const base::ListValue* args);
// Callback for the "suggestedSitesAction" message.
void HandleSuggestedSitesAction(const base::ListValue* args);
// Callback for the "suggestedSitesSelected" message.
void HandleSuggestedSitesSelected(const base::ListValue* args);
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// SuggestionsCombiner::Delegate implementation.
virtual void OnSuggestionsReady() OVERRIDE;
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
private:
// 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);
// Sends pages_value_ to the javascript side to and resets page_value_.
void SendPagesValue();
content::NotificationRegistrar registrar_;
// We pre-fetch the first set of result pages. This variable is false until
// we get the first getSuggestions() call.
bool got_first_suggestions_request_;
// Used to combine suggestions from various sources.
scoped_ptr<SuggestionsCombiner> suggestions_combiner_;
// Whether the user has viewed the 'suggested' pane.
bool suggestions_viewed_;
// Whether the user has performed a "tracked" action to leave the page or not.
bool user_action_logged_;
DISALLOW_COPY_AND_ASSIGN(SuggestionsHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_PAGE_HANDLER_H_
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