win8/test/open_with_dialog_async.cc

   1 // Copyright (c) 2013 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 // Implementation for the asynchronous interface to the Windows shell
   6 // SHOpenWithDialog function.  The call is made on a dedicated UI thread in a
   7 // single-threaded apartment.
   8
   9 #include "win8/test/open_with_dialog_async.h"
  10
  11 #include <shlobj.h>
  12
  13 #include "base/bind.h"
  14 #include "base/callback.h"
  15 #include "base/location.h"
  16 #include "base/memory/ref_counted.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/thread_task_runner_handle.h"
  19 #include "base/threading/platform_thread.h"
  20 #include "base/threading/thread.h"
  21 #include "base/win/windows_version.h"
  22
  23 namespace win8 {
  24
  25 namespace {
  26
  27 struct OpenWithContext {
  28   OpenWithContext(
  29       HWND parent_window_in,
  30       const base::string16& file_name_in,
  31       const base::string16& file_type_class_in,
  32       int open_as_info_flags_in,
  33       const scoped_refptr<base::SingleThreadTaskRunner>& client_runner_in,
  34       const OpenWithDialogCallback& callback_in);
  35   ~OpenWithContext();
  36
  37   base::Thread thread;
  38   HWND parent_window;
  39   base::string16 file_name;
  40   base::string16 file_type_class;
  41   int open_as_info_flags;
  42   scoped_refptr<base::SingleThreadTaskRunner> client_runner;
  43   OpenWithDialogCallback callback;
  44 };
  45
  46 OpenWithContext::OpenWithContext(
  47     HWND parent_window_in,
  48     const base::string16& file_name_in,
  49     const base::string16& file_type_class_in,
  50     int open_as_info_flags_in,
  51     const scoped_refptr<base::SingleThreadTaskRunner>& client_runner_in,
  52     const OpenWithDialogCallback& callback_in)
  53     : thread("OpenWithDialog"),
  54       parent_window(parent_window_in),
  55       file_name(file_name_in),
  56       file_type_class(file_type_class_in),
  57       open_as_info_flags(open_as_info_flags_in),
  58       client_runner(client_runner_in),
  59       callback(callback_in) {
  60   thread.init_com_with_mta(false);
  61   thread.Start();
  62 }
  63
  64 OpenWithContext::~OpenWithContext() {}
  65
  66 // Runs the caller-provided |callback| with the result of the call to
  67 // SHOpenWithDialog on the caller's initial thread.
  68 void OnOpenWithDialogDone(OpenWithContext* context, HRESULT result) {
  69   DCHECK(context->client_runner->BelongsToCurrentThread());
  70   OpenWithDialogCallback callback(context->callback);
  71
  72   // Join with the thread.
  73   delete context;
  74
  75   // Run the client's callback.
  76   callback.Run(result);
  77 }
  78
  79 // Calls SHOpenWithDialog (blocking), and returns the result back to the client
  80 // thread.
  81 void OpenWithDialogTask(OpenWithContext* context) {
  82   DCHECK_EQ(context->thread.thread_id(), base::PlatformThread::CurrentId());
  83   OPENASINFO open_as_info = {
  84     context->file_name.c_str(),
  85     context->file_type_class.c_str(),
  86     context->open_as_info_flags
  87   };
  88
  89   HRESULT result = ::SHOpenWithDialog(context->parent_window, &open_as_info);
  90
  91   // Bounce back to the calling thread to release resources and deliver the
  92   // callback.
  93   if (!context->client_runner->PostTask(
  94           FROM_HERE,
  95           base::Bind(&OnOpenWithDialogDone, context, result))) {
  96     // The calling thread has gone away. There's nothing to be done but leak.
  97     // In practice this is only likely to happen at shutdown, so there isn't
  98     // much of a concern that it'll happen in the real world.
  99     DLOG(ERROR) << "leaking OpenWith thread; result = " << std::hex << result;
 100   }
 101 }
 102
 103 }  // namespace
 104
 105 void OpenWithDialogAsync(
 106     HWND parent_window,
 107     const base::string16& file_name,
 108     const base::string16& file_type_class,
 109     int open_as_info_flags,
 110     const OpenWithDialogCallback& callback) {
 111   DCHECK_GE(base::win::GetVersion(), base::win::VERSION_VISTA);
 112   OpenWithContext* context =
 113       new OpenWithContext(parent_window, file_name, file_type_class,
 114                           open_as_info_flags,
 115                           base::ThreadTaskRunnerHandle::Get(), callback);
 116   context->thread.message_loop()->PostTask(
 117       FROM_HERE,
 118       base::Bind(&OpenWithDialogTask, context));
 119 }
 120
 121 }  // namespace win8