chrome/browser/ui/views/status_icons/status_tray_state_changer_win.cc

   1 // Copyright 2014 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/ui/views/status_icons/status_tray_state_changer_win.h"
   6
   7 namespace {
   8
   9 ////////////////////////////////////////////////////////////////////////////////
  10 // Status Tray API
  11
  12 // The folowing describes the interface to the undocumented Windows Exporer APIs
  13 // for manipulating with the status tray area.  This code should be used with
  14 // care as it can change with versions (even minor versions) of Windows.
  15
  16 // ITrayNotify is an interface describing the API for manipulating the state of
  17 // the Windows notification area, as well as for registering for change
  18 // notifications.
  19 class __declspec(uuid("FB852B2C-6BAD-4605-9551-F15F87830935")) ITrayNotify
  20     : public IUnknown {
  21  public:
  22   virtual HRESULT STDMETHODCALLTYPE
  23       RegisterCallback(INotificationCB* callback) = 0;
  24   virtual HRESULT STDMETHODCALLTYPE
  25       SetPreference(const NOTIFYITEM* notify_item) = 0;
  26   virtual HRESULT STDMETHODCALLTYPE EnableAutoTray(BOOL enabled) = 0;
  27 };
  28
  29 // ITrayNotifyWin8 is the interface that replaces ITrayNotify for newer versions
  30 // of Windows.
  31 class __declspec(uuid("D133CE13-3537-48BA-93A7-AFCD5D2053B4")) ITrayNotifyWin8
  32     : public IUnknown {
  33  public:
  34   virtual HRESULT STDMETHODCALLTYPE
  35       RegisterCallback(INotificationCB* callback, unsigned long*) = 0;
  36   virtual HRESULT STDMETHODCALLTYPE UnregisterCallback(unsigned long*) = 0;
  37   virtual HRESULT STDMETHODCALLTYPE SetPreference(NOTIFYITEM const*) = 0;
  38   virtual HRESULT STDMETHODCALLTYPE EnableAutoTray(BOOL) = 0;
  39   virtual HRESULT STDMETHODCALLTYPE DoAction(BOOL) = 0;
  40 };
  41
  42 const CLSID CLSID_TrayNotify = {
  43     0x25DEAD04,
  44     0x1EAC,
  45     0x4911,
  46     {0x9E, 0x3A, 0xAD, 0x0A, 0x4A, 0xB5, 0x60, 0xFD}};
  47
  48 }  // namespace
  49
  50 StatusTrayStateChangerWin::StatusTrayStateChangerWin(UINT icon_id, HWND window)
  51     : interface_version_(INTERFACE_VERSION_UNKNOWN),
  52       icon_id_(icon_id),
  53       window_(window) {
  54   wchar_t module_name[MAX_PATH];
  55   ::GetModuleFileName(NULL, module_name, MAX_PATH);
  56
  57   file_name_ = module_name;
  58 }
  59
  60 void StatusTrayStateChangerWin::EnsureTrayIconVisible() {
  61   DCHECK(CalledOnValidThread());
  62
  63   if (!CreateTrayNotify()) {
  64     VLOG(1) << "Unable to create COM object for ITrayNotify.";
  65     return;
  66   }
  67
  68   scoped_ptr<NOTIFYITEM> notify_item = RegisterCallback();
  69
  70   // If the user has already hidden us explicitly, try to honor their choice by
  71   // not changing anything.
  72   if (notify_item->preference == PREFERENCE_SHOW_NEVER)
  73     return;
  74
  75   // If we are already on the taskbar, return since nothing needs to be done.
  76   if (notify_item->preference == PREFERENCE_SHOW_ALWAYS)
  77     return;
  78
  79   notify_item->preference = PREFERENCE_SHOW_ALWAYS;
  80
  81   SendNotifyItemUpdate(notify_item.Pass());
  82 }
  83
  84 STDMETHODIMP_(ULONG) StatusTrayStateChangerWin::AddRef() {
  85   DCHECK(CalledOnValidThread());
  86   return base::win::IUnknownImpl::AddRef();
  87 }
  88
  89 STDMETHODIMP_(ULONG) StatusTrayStateChangerWin::Release() {
  90   DCHECK(CalledOnValidThread());
  91   return base::win::IUnknownImpl::Release();
  92 }
  93
  94 STDMETHODIMP StatusTrayStateChangerWin::QueryInterface(REFIID riid,
  95                                                        PVOID* ptr_void) {
  96   DCHECK(CalledOnValidThread());
  97   if (riid == __uuidof(INotificationCB)) {
  98     *ptr_void = static_cast<INotificationCB*>(this);
  99     AddRef();
 100     return S_OK;
 101   }
 102
 103   return base::win::IUnknownImpl::QueryInterface(riid, ptr_void);
 104 }
 105
 106 STDMETHODIMP StatusTrayStateChangerWin::Notify(ULONG event,
 107                                                NOTIFYITEM* notify_item) {
 108   DCHECK(CalledOnValidThread());
 109   DCHECK(notify_item);
 110   if (notify_item->hwnd != window_ || notify_item->id != icon_id_ ||
 111       base::string16(notify_item->exe_name) != file_name_) {
 112     return S_OK;
 113   }
 114
 115   notify_item_.reset(new NOTIFYITEM(*notify_item));
 116   return S_OK;
 117 }
 118
 119 StatusTrayStateChangerWin::~StatusTrayStateChangerWin() {
 120   DCHECK(CalledOnValidThread());
 121 }
 122
 123 bool StatusTrayStateChangerWin::CreateTrayNotify() {
 124   DCHECK(CalledOnValidThread());
 125
 126   tray_notify_.Release();  // Release so this method can be called more than
 127                            // once.
 128
 129   HRESULT hr = tray_notify_.CreateInstance(CLSID_TrayNotify);
 130   if (FAILED(hr))
 131     return false;
 132
 133   base::win::ScopedComPtr<ITrayNotifyWin8> tray_notify_win8;
 134   hr = tray_notify_win8.QueryFrom(tray_notify_);
 135   if (SUCCEEDED(hr)) {
 136     interface_version_ = INTERFACE_VERSION_WIN8;
 137     return true;
 138   }
 139
 140   base::win::ScopedComPtr<ITrayNotify> tray_notify_legacy;
 141   hr = tray_notify_legacy.QueryFrom(tray_notify_);
 142   if (SUCCEEDED(hr)) {
 143     interface_version_ = INTERFACE_VERSION_LEGACY;
 144     return true;
 145   }
 146
 147   return false;
 148 }
 149
 150 scoped_ptr<NOTIFYITEM> StatusTrayStateChangerWin::RegisterCallback() {
 151   // |notify_item_| is used to store the result of the callback from
 152   // Explorer.exe, which happens synchronously during
 153   // RegisterCallbackWin8 or RegisterCallbackLegacy.
 154   DCHECK(notify_item_.get() == NULL);
 155
 156   // TODO(dewittj): Add UMA logging here to report if either of our strategies
 157   // has a tendency to fail on particular versions of Windows.
 158   switch (interface_version_) {
 159     case INTERFACE_VERSION_WIN8:
 160       if (!RegisterCallbackWin8())
 161         VLOG(1) << "Unable to successfully run RegisterCallbackWin8.";
 162       break;
 163     case INTERFACE_VERSION_LEGACY:
 164       if (!RegisterCallbackLegacy())
 165         VLOG(1) << "Unable to successfully run RegisterCallbackLegacy.";
 166       break;
 167     default:
 168       NOTREACHED();
 169   }
 170
 171   // Adding an intermediate scoped pointer here so that |notify_item_| is reset
 172   // to NULL.
 173   scoped_ptr<NOTIFYITEM> rv(notify_item_.release());
 174   return rv.Pass();
 175 }
 176
 177 bool StatusTrayStateChangerWin::RegisterCallbackWin8() {
 178   base::win::ScopedComPtr<ITrayNotifyWin8> tray_notify_win8;
 179   HRESULT hr = tray_notify_win8.QueryFrom(tray_notify_);
 180   if (FAILED(hr))
 181     return false;
 182
 183   // The following two lines cause Windows Explorer to call us back with all the
 184   // existing tray icons and their preference.  It would also presumably notify
 185   // us if changes were made in realtime while we registered as a callback, but
 186   // we just want to modify our own entry so we immediately unregister.
 187   unsigned long callback_id = 0;
 188   hr = tray_notify_win8->RegisterCallback(this, &callback_id);
 189   tray_notify_win8->UnregisterCallback(&callback_id);
 190   if (FAILED(hr)) {
 191     return false;
 192   }
 193
 194   return true;
 195 }
 196
 197 bool StatusTrayStateChangerWin::RegisterCallbackLegacy() {
 198   base::win::ScopedComPtr<ITrayNotify> tray_notify;
 199   HRESULT hr = tray_notify.QueryFrom(tray_notify_);
 200   if (FAILED(hr)) {
 201     return false;
 202   }
 203
 204   // The following two lines cause Windows Explorer to call us back with all the
 205   // existing tray icons and their preference.  It would also presumably notify
 206   // us if changes were made in realtime while we registered as a callback.  In
 207   // this version of the API, there can be only one registered callback so it is
 208   // better to unregister as soon as possible.
 209   // TODO(dewittj): Try to notice if the notification area icon customization
 210   // window is open and postpone this call until the user closes it;
 211   // registering the callback while the window is open can cause stale data to
 212   // be displayed to the user.
 213   hr = tray_notify->RegisterCallback(this);
 214   tray_notify->RegisterCallback(NULL);
 215   if (FAILED(hr)) {
 216     return false;
 217   }
 218
 219   return true;
 220 }
 221
 222 void StatusTrayStateChangerWin::SendNotifyItemUpdate(
 223     scoped_ptr<NOTIFYITEM> notify_item) {
 224   if (interface_version_ == INTERFACE_VERSION_LEGACY) {
 225     base::win::ScopedComPtr<ITrayNotify> tray_notify;
 226     HRESULT hr = tray_notify.QueryFrom(tray_notify_);
 227     if (SUCCEEDED(hr))
 228       tray_notify->SetPreference(notify_item.get());
 229   } else if (interface_version_ == INTERFACE_VERSION_WIN8) {
 230     base::win::ScopedComPtr<ITrayNotifyWin8> tray_notify;
 231     HRESULT hr = tray_notify.QueryFrom(tray_notify_);
 232     if (SUCCEEDED(hr))
 233       tray_notify->SetPreference(notify_item.get());
 234   }
 235 }