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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/metro.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/win/scoped_comptr.h"
#include "base/win/windows_version.h"
namespace base {
namespace win {
const char kActivateApplication[] = "ActivateApplication";
HMODULE GetMetroModule() {
const HMODULE kUninitialized = reinterpret_cast<HMODULE>(1);
static HMODULE metro_module = kUninitialized;
if (metro_module == kUninitialized) {
// Initialize the cache, note that the initialization is idempotent
// under the assumption that metro_driver is never unloaded, so the
// race to this assignment is safe.
metro_module = GetModuleHandleA("metro_driver.dll");
if (metro_module != NULL) {
// This must be a metro process if the metro_driver is loaded.
DCHECK(IsMetroProcess());
}
}
DCHECK(metro_module != kUninitialized);
return metro_module;
}
bool IsMetroProcess() {
enum ImmersiveState {
kImmersiveUnknown,
kImmersiveTrue,
kImmersiveFalse
};
typedef BOOL (WINAPI* IsImmersiveProcessFunc)(HANDLE process);
// The immersive state of a process can never change.
// Look it up once and cache it here.
static ImmersiveState state = kImmersiveUnknown;
if (state == kImmersiveUnknown) {
// The lookup hasn't been done yet. Note that the code below here is
// idempotent, so it doesn't matter if it races to assignment on multiple
// threads.
HMODULE user32 = ::GetModuleHandleA("user32.dll");
DCHECK(user32 != NULL);
IsImmersiveProcessFunc is_immersive_process =
reinterpret_cast<IsImmersiveProcessFunc>(
::GetProcAddress(user32, "IsImmersiveProcess"));
if (is_immersive_process != NULL) {
if (is_immersive_process(::GetCurrentProcess())) {
state = kImmersiveTrue;
} else {
state = kImmersiveFalse;
}
} else {
// No "IsImmersiveProcess" export on user32.dll, so this is pre-Windows8
// and therefore not immersive.
state = kImmersiveFalse;
}
}
DCHECK_NE(kImmersiveUnknown, state);
return state == kImmersiveTrue;
}
bool IsTsfAwareRequired() {
// Although this function is equal to IsMetroProcess at this moment,
// Chrome for Win7 and Vista may support TSF in the future.
return IsMetroProcess();
}
wchar_t* LocalAllocAndCopyString(const string16& src) {
size_t dest_size = (src.length() + 1) * sizeof(wchar_t);
wchar_t* dest = reinterpret_cast<wchar_t*>(LocalAlloc(LPTR, dest_size));
base::wcslcpy(dest, src.c_str(), dest_size);
return dest;
}
bool IsTouchEnabled() {
int value = GetSystemMetrics(SM_DIGITIZER);
return value & (NID_READY | NID_INTEGRATED_TOUCH) ==
(NID_READY | NID_INTEGRATED_TOUCH);
}
bool IsParentalControlActivityLoggingOn() {
// Query this info on Windows Vista and above.
if (base::win::GetVersion() < base::win::VERSION_VISTA)
return false;
static bool parental_control_logging_required = false;
static bool parental_control_status_determined = false;
if (parental_control_status_determined)
return parental_control_logging_required;
parental_control_status_determined = true;
ScopedComPtr<IWindowsParentalControlsCore> parent_controls;
HRESULT hr = parent_controls.CreateInstance(
__uuidof(WindowsParentalControls));
if (FAILED(hr))
return false;
ScopedComPtr<IWPCSettings> settings;
hr = parent_controls->GetUserSettings(NULL, settings.Receive());
if (FAILED(hr))
return false;
unsigned long restrictions = 0;
settings->GetRestrictions(&restrictions);
parental_control_logging_required =
(restrictions & WPCFLAG_LOGGING_REQUIRED) == WPCFLAG_LOGGING_REQUIRED;
return parental_control_logging_required;
}
} // namespace win
} // namespace base
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