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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_USER_STYLE_SHEET_WATCHER_H_
#define CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
#include "base/callback_list.h"
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/sequenced_task_runner_helpers.h"
#include "components/browser_context_keyed_service/refcounted_browser_context_keyed_service.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "url/gurl.h"
class Profile;
class UserStyleSheetLoader;
// Watches the user style sheet file and triggers reloads on the file thread
// whenever the file changes.
class UserStyleSheetWatcher
: public content::NotificationObserver,
public RefcountedBrowserContextKeyedService {
public:
UserStyleSheetWatcher(Profile* profile, const base::FilePath& profile_path);
void Init();
GURL user_style_sheet() const;
// Register a callback to be called whenever the stylesheet gets updated.
scoped_ptr<base::CallbackList<void(void)>::Subscription>
RegisterOnStyleSheetUpdatedCallback(const base::Closure& callback);
// content::NotificationObserver interface
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// RefCountedProfileKeyedBase method override.
virtual void ShutdownOnUIThread() OVERRIDE;
private:
friend class base::DeleteHelper<UserStyleSheetWatcher>;
virtual ~UserStyleSheetWatcher();
// The profile owning us.
Profile* profile_;
// The directory containing User StyleSheets/Custom.css.
base::FilePath profile_path_;
// The loader object.
scoped_refptr<UserStyleSheetLoader> loader_;
// Watches for changes to the css file so we can reload the style sheet.
scoped_ptr<base::FilePathWatcher> file_watcher_;
content::NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(UserStyleSheetWatcher);
};
#endif // CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
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