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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
      6 #define CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
      7 #pragma once
      8 
      9 #include "base/file_path.h"
     10 #include "base/files/file_path_watcher.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "content/browser/browser_thread.h"
     14 #include "content/common/notification_observer.h"
     15 #include "content/common/notification_registrar.h"
     16 #include "googleurl/src/gurl.h"
     17 
     18 class UserStyleSheetLoader;
     19 
     20 // Watches the user style sheet file and triggers reloads on the file thread
     21 // whenever the file changes.
     22 class UserStyleSheetWatcher
     23     : public base::RefCountedThreadSafe<UserStyleSheetWatcher,
     24                                         BrowserThread::DeleteOnUIThread>,
     25       public NotificationObserver {
     26  public:
     27   explicit UserStyleSheetWatcher(const FilePath& profile_path);
     28 
     29   void Init();
     30 
     31   GURL user_style_sheet() const;
     32 
     33   // NotificationObserver interface
     34   virtual void Observe(NotificationType type,
     35                        const NotificationSource& source,
     36                        const NotificationDetails& details);
     37 
     38  private:
     39   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
     40   friend class DeleteTask<UserStyleSheetWatcher>;
     41 
     42   virtual ~UserStyleSheetWatcher();
     43 
     44   // The directory containing User StyleSheets/Custom.css.
     45   FilePath profile_path_;
     46 
     47   // The loader object.
     48   scoped_refptr<UserStyleSheetLoader> loader_;
     49 
     50   // Watches for changes to the css file so we can reload the style sheet.
     51   scoped_ptr<base::files::FilePathWatcher> file_watcher_;
     52 
     53   NotificationRegistrar registrar_;
     54 
     55   DISALLOW_COPY_AND_ASSIGN(UserStyleSheetWatcher);
     56 };
     57 
     58 #endif  // CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
     59