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 "base/thread_task_runner_handle.h"
  10 #include "content/public/browser/browser_thread.h"
  11
  12 using content::BrowserThread;
  13
  14 IconLoader::IconLoader(const base::FilePath& file_path,
  15                        IconSize size,
  16                        Delegate* delegate)
  17     : target_task_runner_(NULL),
  18       file_path_(file_path),
  19       icon_size_(size),
  20       delegate_(delegate) {}
  21
  22 IconLoader::~IconLoader() {
  23 }
  24
  25 void IconLoader::Start() {
  26   target_task_runner_ = base::ThreadTaskRunnerHandle::Get();
  27
  28   BrowserThread::PostTaskAndReply(BrowserThread::FILE, FROM_HERE,
  29       base::Bind(&IconLoader::ReadGroup, this),
  30       base::Bind(&IconLoader::OnReadGroup, this));
  31 }
  32
  33 void IconLoader::ReadGroup() {
  34   group_ = ReadGroupIDFromFilepath(file_path_);
  35 }
  36
  37 void IconLoader::OnReadGroup() {
  38   if (IsIconMutableFromFilepath(file_path_) ||
  39       !delegate_->OnGroupLoaded(this, group_)) {
  40     BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
  41         base::Bind(&IconLoader::ReadIcon, this));
  42   }
  43 }
  44
  45 void IconLoader::NotifyDelegate() {
  46   // If the delegate takes ownership of the Image, release it from the scoped
  47   // pointer.
  48   if (delegate_->OnImageLoaded(this, image_.get(), group_))
  49     ignore_result(image_.release());  // Can't ignore return value.
  50 }