chrome/browser/icon_loader.cc

   1 // Copyright (c) 2012 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 #include "chrome/browser/icon_loader.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/bind.h"
   9 #include "content/public/browser/browser_thread.h"
  10
  11 using content::BrowserThread;
  12
  13 IconLoader::IconLoader(const base::FilePath& file_path,
  14                        IconSize size,
  15                        Delegate* delegate)
  16     : target_message_loop_(NULL),
  17       file_path_(file_path),
  18       icon_size_(size),
  19       delegate_(delegate) {}
  20
  21 IconLoader::~IconLoader() {
  22 }
  23
  24 void IconLoader::Start() {
  25   target_message_loop_ = base::MessageLoopProxy::current();
  26
  27   BrowserThread::PostTaskAndReply(BrowserThread::FILE, FROM_HERE,
  28       base::Bind(&IconLoader::ReadGroup, this),
  29       base::Bind(&IconLoader::OnReadGroup, this));
  30 }
  31
  32 void IconLoader::ReadGroup() {
  33   group_ = ReadGroupIDFromFilepath(file_path_);
  34 }
  35
  36 void IconLoader::OnReadGroup() {
  37   if (IsIconMutableFromFilepath(file_path_) ||
  38       !delegate_->OnGroupLoaded(this, group_)) {
  39     BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
  40         base::Bind(&IconLoader::ReadIcon, this));
  41   }
  42 }
  43
  44 void IconLoader::NotifyDelegate() {
  45   // If the delegate takes ownership of the Image, release it from the scoped
  46   // pointer.
  47   if (delegate_->OnImageLoaded(this, image_.get(), group_))
  48     ignore_result(image_.release());  // Can't ignore return value.
  49 }