base/win/metro.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 "base/win/metro.h"
   6
   7 #include "base/message_loop.h"
   8 #include "base/string_util.h"
   9 #include "base/win/scoped_comptr.h"
  10 #include "base/win/windows_version.h"
  11
  12 namespace base {
  13 namespace win {
  14
  15 const char kActivateApplication[] = "ActivateApplication";
  16
  17 HMODULE GetMetroModule() {
  18   const HMODULE kUninitialized = reinterpret_cast<HMODULE>(1);
  19   static HMODULE metro_module = kUninitialized;
  20
  21   if (metro_module == kUninitialized) {
  22     // Initialize the cache, note that the initialization is idempotent
  23     // under the assumption that metro_driver is never unloaded, so the
  24     // race to this assignment is safe.
  25     metro_module = GetModuleHandleA("metro_driver.dll");
  26     if (metro_module != NULL) {
  27       // This must be a metro process if the metro_driver is loaded.
  28       DCHECK(IsMetroProcess());
  29     }
  30   }
  31
  32   DCHECK(metro_module != kUninitialized);
  33   return metro_module;
  34 }
  35
  36 bool IsMetroProcess() {
  37   enum ImmersiveState {
  38     kImmersiveUnknown,
  39     kImmersiveTrue,
  40     kImmersiveFalse
  41   };
  42   typedef BOOL (WINAPI* IsImmersiveProcessFunc)(HANDLE process);
  43
  44   // The immersive state of a process can never change.
  45   // Look it up once and cache it here.
  46   static ImmersiveState state = kImmersiveUnknown;
  47
  48   if (state == kImmersiveUnknown) {
  49     // The lookup hasn't been done yet. Note that the code below here is
  50     // idempotent, so it doesn't matter if it races to assignment on multiple
  51     // threads.
  52     HMODULE user32 = ::GetModuleHandleA("user32.dll");
  53     DCHECK(user32 != NULL);
  54
  55     IsImmersiveProcessFunc is_immersive_process =
  56         reinterpret_cast<IsImmersiveProcessFunc>(
  57             ::GetProcAddress(user32, "IsImmersiveProcess"));
  58
  59     if (is_immersive_process != NULL) {
  60       if (is_immersive_process(::GetCurrentProcess())) {
  61         state = kImmersiveTrue;
  62       } else {
  63         state = kImmersiveFalse;
  64       }
  65     } else {
  66       // No "IsImmersiveProcess" export on user32.dll, so this is pre-Windows8
  67       // and therefore not immersive.
  68       state = kImmersiveFalse;
  69     }
  70   }
  71   DCHECK_NE(kImmersiveUnknown, state);
  72
  73   return state == kImmersiveTrue;
  74 }
  75
  76 bool IsTsfAwareRequired() {
  77   // Although this function is equal to IsMetroProcess at this moment,
  78   // Chrome for Win7 and Vista may support TSF in the future.
  79   return IsMetroProcess();
  80 }
  81
  82 wchar_t* LocalAllocAndCopyString(const string16& src) {
  83   size_t dest_size = (src.length() + 1) * sizeof(wchar_t);
  84   wchar_t* dest = reinterpret_cast<wchar_t*>(LocalAlloc(LPTR, dest_size));
  85   base::wcslcpy(dest, src.c_str(), dest_size);
  86   return dest;
  87 }
  88
  89 bool IsTouchEnabled() {
  90   int value = GetSystemMetrics(SM_DIGITIZER);
  91   return value & (NID_READY | NID_INTEGRATED_TOUCH) ==
  92              (NID_READY | NID_INTEGRATED_TOUCH);
  93 }
  94
  95 bool IsParentalControlActivityLoggingOn() {
  96   // Query this info on Windows Vista and above.
  97   if (base::win::GetVersion() < base::win::VERSION_VISTA)
  98     return false;
  99
 100   static bool parental_control_logging_required = false;
 101   static bool parental_control_status_determined = false;
 102
 103   if (parental_control_status_determined)
 104     return parental_control_logging_required;
 105
 106   parental_control_status_determined = true;
 107
 108   ScopedComPtr<IWindowsParentalControlsCore> parent_controls;
 109   HRESULT hr = parent_controls.CreateInstance(
 110       __uuidof(WindowsParentalControls));
 111   if (FAILED(hr))
 112     return false;
 113
 114   ScopedComPtr<IWPCSettings> settings;
 115   hr = parent_controls->GetUserSettings(NULL, settings.Receive());
 116   if (FAILED(hr))
 117     return false;
 118
 119   unsigned long restrictions = 0;
 120   settings->GetRestrictions(&restrictions);
 121
 122   parental_control_logging_required =
 123       (restrictions & WPCFLAG_LOGGING_REQUIRED) == WPCFLAG_LOGGING_REQUIRED;
 124   return parental_control_logging_required;
 125 }
 126
 127 // Metro driver exports for getting the launch type, initial url, initial
 128 // search term, etc.
 129 extern "C" {
 130 typedef const wchar_t* (*GetInitialUrl)();
 131 typedef const wchar_t* (*GetInitialSearchString)();
 132 typedef base::win::MetroLaunchType (*GetLaunchType)(
 133     base::win::MetroPreviousExecutionState* previous_state);
 134 }
 135
 136 MetroLaunchType GetMetroLaunchParams(string16* params) {
 137   HMODULE metro = base::win::GetMetroModule();
 138   if (!metro)
 139     return base::win::METRO_LAUNCH_ERROR;
 140
 141   GetLaunchType get_launch_type = reinterpret_cast<GetLaunchType>(
 142       ::GetProcAddress(metro, "GetLaunchType"));
 143   DCHECK(get_launch_type);
 144
 145   base::win::MetroLaunchType launch_type = get_launch_type(NULL);
 146
 147   if ((launch_type == base::win::METRO_PROTOCOL) ||
 148       (launch_type == base::win::METRO_LAUNCH)) {
 149     GetInitialUrl initial_metro_url = reinterpret_cast<GetInitialUrl>(
 150         ::GetProcAddress(metro, "GetInitialUrl"));
 151     DCHECK(initial_metro_url);
 152     *params = initial_metro_url();
 153   } else if (launch_type == base::win::METRO_SEARCH) {
 154     GetInitialSearchString initial_search_string =
 155         reinterpret_cast<GetInitialSearchString>(
 156             ::GetProcAddress(metro, "GetInitialSearchString"));
 157     DCHECK(initial_search_string);
 158     *params = initial_search_string();
 159   }
 160   return launch_type;
 161 }
 162
 163 }  // namespace win
 164 }  // namespace base