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Diffstat (limited to 'widget/windows/nsAppShell.cpp')
| -rw-r--r-- | widget/windows/nsAppShell.cpp | 810 |
1 files changed, 810 insertions, 0 deletions
diff --git a/widget/windows/nsAppShell.cpp b/widget/windows/nsAppShell.cpp new file mode 100644 index 0000000000..704da730f2 --- /dev/null +++ b/widget/windows/nsAppShell.cpp @@ -0,0 +1,810 @@ +/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/ipc/MessageChannel.h" +#include "mozilla/ipc/WindowsMessageLoop.h" +#include "nsAppShell.h" +#include "nsToolkit.h" +#include "nsThreadUtils.h" +#include "WinUtils.h" +#include "WinTaskbar.h" +#include "WinMouseScrollHandler.h" +#include "nsWindowDefs.h" +#include "nsWindow.h" +#include "nsString.h" +#include "WinIMEHandler.h" +#include "mozilla/widget/AudioSession.h" +#include "mozilla/BackgroundHangMonitor.h" +#include "mozilla/Hal.h" +#include "nsIDOMWakeLockListener.h" +#include "nsIPowerManagerService.h" +#include "mozilla/ProfilerLabels.h" +#include "mozilla/StaticPtr.h" +#include "nsTHashtable.h" +#include "nsHashKeys.h" +#include "nsComponentManagerUtils.h" +#include "ScreenHelperWin.h" +#include "HeadlessScreenHelper.h" +#include "mozilla/widget/ScreenManager.h" +#include "mozilla/Atomics.h" +#include "mozilla/WindowsProcessMitigations.h" +#include "mozilla/WindowsVersion.h" + +#ifdef MOZ_BACKGROUNDTASKS +# include "mozilla/BackgroundTasks.h" +#endif + +#if defined(ACCESSIBILITY) +# include "mozilla/a11y/Compatibility.h" +# include "mozilla/a11y/Platform.h" +#endif // defined(ACCESSIBILITY) + +using namespace mozilla; +using namespace mozilla::widget; + +#define WAKE_LOCK_LOG(...) \ + MOZ_LOG(gWinWakeLockLog, mozilla::LogLevel::Debug, (__VA_ARGS__)) +static mozilla::LazyLogModule gWinWakeLockLog("WinWakeLock"); + +// This wakelock listener is used for Window7 and above. +class WinWakeLockListener final : public nsIDOMMozWakeLockListener { + public: + NS_DECL_ISUPPORTS + WinWakeLockListener() { MOZ_ASSERT(XRE_IsParentProcess()); } + + private: + ~WinWakeLockListener() { + ReleaseWakelockIfNeeded(PowerRequestDisplayRequired); + ReleaseWakelockIfNeeded(PowerRequestExecutionRequired); + } + + void SetHandle(HANDLE aHandle, POWER_REQUEST_TYPE aType) { + switch (aType) { + case PowerRequestDisplayRequired: { + if (!aHandle && mDisplayHandle) { + CloseHandle(mDisplayHandle); + } + mDisplayHandle = aHandle; + return; + } + case PowerRequestExecutionRequired: { + if (!aHandle && mNonDisplayHandle) { + CloseHandle(mNonDisplayHandle); + } + mNonDisplayHandle = aHandle; + return; + } + default: + MOZ_ASSERT_UNREACHABLE("Invalid request type"); + return; + } + } + + HANDLE GetHandle(POWER_REQUEST_TYPE aType) const { + switch (aType) { + case PowerRequestDisplayRequired: + return mDisplayHandle; + case PowerRequestExecutionRequired: + return mNonDisplayHandle; + default: + MOZ_ASSERT_UNREACHABLE("Invalid request type"); + return nullptr; + } + } + + HANDLE CreateHandle(POWER_REQUEST_TYPE aType) { + MOZ_ASSERT(!GetHandle(aType)); + REASON_CONTEXT context = {0}; + context.Version = POWER_REQUEST_CONTEXT_VERSION; + context.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING; + context.Reason.SimpleReasonString = RequestTypeLPWSTR(aType); + HANDLE handle = PowerCreateRequest(&context); + if (!handle) { + WAKE_LOCK_LOG("Failed to create handle for %s, error=%lu", + RequestTypeStr(aType), GetLastError()); + return nullptr; + } + SetHandle(handle, aType); + return handle; + } + + LPWSTR RequestTypeLPWSTR(POWER_REQUEST_TYPE aType) const { + switch (aType) { + case PowerRequestDisplayRequired: + return const_cast<LPWSTR>(L"display request"); // -Wwritable-strings + case PowerRequestExecutionRequired: + return const_cast<LPWSTR>( + L"non-display request"); // -Wwritable-strings + default: + MOZ_ASSERT_UNREACHABLE("Invalid request type"); + return const_cast<LPWSTR>(L"unknown"); // -Wwritable-strings + } + } + + const char* RequestTypeStr(POWER_REQUEST_TYPE aType) const { + switch (aType) { + case PowerRequestDisplayRequired: + return "display request"; + case PowerRequestExecutionRequired: + return "non-display request"; + default: + MOZ_ASSERT_UNREACHABLE("Invalid request type"); + return "unknown"; + } + } + + void RequestWakelockIfNeeded(POWER_REQUEST_TYPE aType) { + if (GetHandle(aType)) { + WAKE_LOCK_LOG("Already requested lock for %s", RequestTypeStr(aType)); + return; + } + + WAKE_LOCK_LOG("Prepare a wakelock for %s", RequestTypeStr(aType)); + HANDLE handle = CreateHandle(aType); + if (!handle) { + WAKE_LOCK_LOG("Failed due to no handle for %s", RequestTypeStr(aType)); + return; + } + + if (PowerSetRequest(handle, aType)) { + WAKE_LOCK_LOG("Requested %s lock", RequestTypeStr(aType)); + } else { + WAKE_LOCK_LOG("Failed to request %s lock, error=%lu", + RequestTypeStr(aType), GetLastError()); + SetHandle(nullptr, aType); + } + } + + void ReleaseWakelockIfNeeded(POWER_REQUEST_TYPE aType) { + if (!GetHandle(aType)) { + WAKE_LOCK_LOG("Already released lock for %s", RequestTypeStr(aType)); + return; + } + + WAKE_LOCK_LOG("Prepare to release wakelock for %s", RequestTypeStr(aType)); + if (!PowerClearRequest(GetHandle(aType), aType)) { + WAKE_LOCK_LOG("Failed to release %s lock, error=%lu", + RequestTypeStr(aType), GetLastError()); + return; + } + SetHandle(nullptr, aType); + WAKE_LOCK_LOG("Released wakelock for %s", RequestTypeStr(aType)); + } + + NS_IMETHOD Callback(const nsAString& aTopic, + const nsAString& aState) override { + WAKE_LOCK_LOG("topic=%s, state=%s", NS_ConvertUTF16toUTF8(aTopic).get(), + NS_ConvertUTF16toUTF8(aState).get()); + if (!aTopic.EqualsASCII("screen") && !aTopic.EqualsASCII("audio-playing") && + !aTopic.EqualsASCII("video-playing")) { + return NS_OK; + } + + const bool isNonDisplayLock = aTopic.EqualsASCII("audio-playing"); + bool requestLock = false; + if (isNonDisplayLock) { + requestLock = aState.EqualsASCII("locked-foreground") || + aState.EqualsASCII("locked-background"); + } else { + requestLock = aState.EqualsASCII("locked-foreground"); + } + + if (isNonDisplayLock) { + if (requestLock) { + RequestWakelockIfNeeded(PowerRequestExecutionRequired); + } else { + ReleaseWakelockIfNeeded(PowerRequestExecutionRequired); + } + } else { + if (requestLock) { + RequestWakelockIfNeeded(PowerRequestDisplayRequired); + } else { + ReleaseWakelockIfNeeded(PowerRequestDisplayRequired); + } + } + return NS_OK; + } + + // Handle would only exist when we request wakelock successfully. + HANDLE mDisplayHandle = nullptr; + HANDLE mNonDisplayHandle = nullptr; +}; +NS_IMPL_ISUPPORTS(WinWakeLockListener, nsIDOMMozWakeLockListener) + +// This wakelock is used for the version older than Windows7. +class LegacyWinWakeLockListener final : public nsIDOMMozWakeLockListener { + public: + NS_DECL_ISUPPORTS + LegacyWinWakeLockListener() { MOZ_ASSERT(XRE_IsParentProcess()); } + + private: + ~LegacyWinWakeLockListener() {} + + NS_IMETHOD Callback(const nsAString& aTopic, + const nsAString& aState) override { + WAKE_LOCK_LOG("WinWakeLock: topic=%s, state=%s", + NS_ConvertUTF16toUTF8(aTopic).get(), + NS_ConvertUTF16toUTF8(aState).get()); + if (!aTopic.EqualsASCII("screen") && !aTopic.EqualsASCII("audio-playing") && + !aTopic.EqualsASCII("video-playing")) { + return NS_OK; + } + + // Check what kind of lock we will require, if both display lock and non + // display lock are needed, we would require display lock because it has + // higher priority. + if (aTopic.EqualsASCII("audio-playing")) { + mRequireForNonDisplayLock = aState.EqualsASCII("locked-foreground") || + aState.EqualsASCII("locked-background"); + } else if (aTopic.EqualsASCII("screen") || + aTopic.EqualsASCII("video-playing")) { + mRequireForDisplayLock = aState.EqualsASCII("locked-foreground"); + } + + if (mRequireForDisplayLock) { + WAKE_LOCK_LOG("WinWakeLock: Request display lock"); + SetThreadExecutionState(ES_DISPLAY_REQUIRED | ES_CONTINUOUS); + } else if (mRequireForNonDisplayLock) { + WAKE_LOCK_LOG("WinWakeLock: Request non-display lock"); + SetThreadExecutionState(ES_SYSTEM_REQUIRED | ES_CONTINUOUS); + } else { + WAKE_LOCK_LOG("WinWakeLock: reset lock"); + SetThreadExecutionState(ES_CONTINUOUS); + } + return NS_OK; + } + + bool mRequireForDisplayLock = false; + bool mRequireForNonDisplayLock = false; +}; + +NS_IMPL_ISUPPORTS(LegacyWinWakeLockListener, nsIDOMMozWakeLockListener) +StaticRefPtr<nsIDOMMozWakeLockListener> sWakeLockListener; + +static void AddScreenWakeLockListener() { + nsCOMPtr<nsIPowerManagerService> sPowerManagerService = + do_GetService(POWERMANAGERSERVICE_CONTRACTID); + if (sPowerManagerService) { + if (IsWin7SP1OrLater()) { + sWakeLockListener = new WinWakeLockListener(); + } else { + sWakeLockListener = new LegacyWinWakeLockListener(); + } + sPowerManagerService->AddWakeLockListener(sWakeLockListener); + } else { + NS_WARNING( + "Failed to retrieve PowerManagerService, wakelocks will be broken!"); + } +} + +static void RemoveScreenWakeLockListener() { + nsCOMPtr<nsIPowerManagerService> sPowerManagerService = + do_GetService(POWERMANAGERSERVICE_CONTRACTID); + if (sPowerManagerService) { + sPowerManagerService->RemoveWakeLockListener(sWakeLockListener); + sPowerManagerService = nullptr; + sWakeLockListener = nullptr; + } +} + +class SingleNativeEventPump final : public nsIThreadObserver { + public: + NS_DECL_THREADSAFE_ISUPPORTS + NS_DECL_NSITHREADOBSERVER + + SingleNativeEventPump() { + MOZ_ASSERT(!XRE_UseNativeEventProcessing(), + "Should only be used when not properly processing events."); + } + + private: + ~SingleNativeEventPump() {} +}; + +NS_IMPL_ISUPPORTS(SingleNativeEventPump, nsIThreadObserver) + +NS_IMETHODIMP +SingleNativeEventPump::OnDispatchedEvent() { return NS_OK; } + +NS_IMETHODIMP +SingleNativeEventPump::OnProcessNextEvent(nsIThreadInternal* aThread, + bool aMayWait) { + MSG msg; + bool gotMessage = WinUtils::PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE); + if (gotMessage) { + ::TranslateMessage(&msg); + ::DispatchMessageW(&msg); + } + return NS_OK; +} + +NS_IMETHODIMP +SingleNativeEventPump::AfterProcessNextEvent(nsIThreadInternal* aThread, + bool aMayWait) { + return NS_OK; +} + +// RegisterWindowMessage values +// Native event callback message +const wchar_t* kAppShellGeckoEventId = L"nsAppShell:EventID"; +UINT sAppShellGeckoMsgId; +// Taskbar button creation message +const wchar_t* kTaskbarButtonEventId = L"TaskbarButtonCreated"; +UINT sTaskbarButtonCreatedMsg; + +/* static */ +UINT nsAppShell::GetTaskbarButtonCreatedMessage() { + return sTaskbarButtonCreatedMsg; +} + +namespace mozilla { +namespace crashreporter { +void LSPAnnotate(); +} // namespace crashreporter +} // namespace mozilla + +using mozilla::crashreporter::LSPAnnotate; + +//------------------------------------------------------------------------- + +// Note that since we're on x86-ish processors here, ReleaseAcquire is the +// semantics that normal loads and stores would use anyway. +static Atomic<size_t, ReleaseAcquire> sOutstandingNativeEventCallbacks; + +/*static*/ LRESULT CALLBACK nsAppShell::EventWindowProc(HWND hwnd, UINT uMsg, + WPARAM wParam, + LPARAM lParam) { + if (uMsg == sAppShellGeckoMsgId) { + // The app shell might have been destroyed between this message being + // posted and being executed, so be extra careful. + if (!sOutstandingNativeEventCallbacks) { + return TRUE; + } + + nsAppShell* as = reinterpret_cast<nsAppShell*>(lParam); + as->NativeEventCallback(); + --sOutstandingNativeEventCallbacks; + return TRUE; + } + return DefWindowProc(hwnd, uMsg, wParam, lParam); +} + +nsAppShell::~nsAppShell() { + hal::Shutdown(); + + if (mEventWnd) { + // DestroyWindow doesn't do anything when called from a non UI thread. + // Since mEventWnd was created on the UI thread, it must be destroyed on + // the UI thread. + SendMessage(mEventWnd, WM_CLOSE, 0, 0); + } + + // Cancel any outstanding native event callbacks. + sOutstandingNativeEventCallbacks = 0; +} + +#if defined(ACCESSIBILITY) + +static ULONG gUiaMsg; +static HHOOK gUiaHook; +static uint32_t gUiaAttempts; +static const uint32_t kMaxUiaAttempts = 5; + +static void InitUIADetection(); + +static LRESULT CALLBACK UiaHookProc(int aCode, WPARAM aWParam, LPARAM aLParam) { + if (aCode < 0) { + return ::CallNextHookEx(nullptr, aCode, aWParam, aLParam); + } + + auto cwp = reinterpret_cast<CWPSTRUCT*>(aLParam); + if (gUiaMsg && cwp->message == gUiaMsg) { + if (gUiaAttempts < kMaxUiaAttempts) { + ++gUiaAttempts; + + Maybe<bool> shouldCallNextHook = + a11y::Compatibility::OnUIAMessage(cwp->wParam, cwp->lParam); + if (shouldCallNextHook.isSome()) { + // We've got an instantiator. + if (!shouldCallNextHook.value()) { + // We're blocking this instantiation. We need to keep this hook set + // so that we can catch any future instantiation attempts. + return 0; + } + + // We're allowing the instantiator to proceed, so this hook is no longer + // needed. + if (::UnhookWindowsHookEx(gUiaHook)) { + gUiaHook = nullptr; + } + } else { + // Our hook might be firing after UIA; let's try reinstalling ourselves. + InitUIADetection(); + } + } else { + // We've maxed out our attempts. Let's unhook. + if (::UnhookWindowsHookEx(gUiaHook)) { + gUiaHook = nullptr; + } + } + } + + return ::CallNextHookEx(nullptr, aCode, aWParam, aLParam); +} + +static void InitUIADetection() { + if (gUiaHook) { + // In this case we want to re-hook so that the hook is always called ahead + // of UIA's hook. + if (::UnhookWindowsHookEx(gUiaHook)) { + gUiaHook = nullptr; + } + } + + if (!gUiaMsg) { + // This is the message that UIA sends to trigger a command. UIA's + // CallWndProc looks for this message and then handles the request. + // Our hook gets in front of UIA's hook and examines the message first. + gUiaMsg = ::RegisterWindowMessageW(L"HOOKUTIL_MSG"); + } + + if (!gUiaHook) { + gUiaHook = ::SetWindowsHookEx(WH_CALLWNDPROC, &UiaHookProc, nullptr, + ::GetCurrentThreadId()); + } +} + +#endif // defined(ACCESSIBILITY) + +NS_IMETHODIMP +nsAppShell::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + if (XRE_IsParentProcess()) { + nsCOMPtr<nsIObserverService> obsServ( + mozilla::services::GetObserverService()); + +#if defined(ACCESSIBILITY) + if (!strcmp(aTopic, "dll-loaded-main-thread")) { + if (a11y::PlatformDisabledState() != a11y::ePlatformIsDisabled && + !gUiaHook) { + nsDependentString dllName(aData); + + if (StringEndsWith(dllName, u"uiautomationcore.dll"_ns, + nsCaseInsensitiveStringComparator)) { + InitUIADetection(); + + // Now that we've handled the observer notification, we can remove it + obsServ->RemoveObserver(this, "dll-loaded-main-thread"); + } + } + + return NS_OK; + } +#endif // defined(ACCESSIBILITY) + + if (!strcmp(aTopic, "sessionstore-restoring-on-startup")) { + nsWindow::SetIsRestoringSession(true); + // Now that we've handled the observer notification, we can remove it + obsServ->RemoveObserver(this, "sessionstore-restoring-on-startup"); + return NS_OK; + } + + if (!strcmp(aTopic, "sessionstore-windows-restored")) { + nsWindow::SetIsRestoringSession(false); + // Now that we've handled the observer notification, we can remove it + obsServ->RemoveObserver(this, "sessionstore-windows-restored"); + return NS_OK; + } + } + + return nsBaseAppShell::Observe(aSubject, aTopic, aData); +} + +nsresult nsAppShell::Init() { + LSPAnnotate(); + + hal::Init(); + + if (XRE_IsParentProcess()) { + sTaskbarButtonCreatedMsg = ::RegisterWindowMessageW(kTaskbarButtonEventId); + NS_ASSERTION(sTaskbarButtonCreatedMsg, + "Could not register taskbar button creation message"); + } + + // The hidden message window is used for interrupting the processing of native + // events, so that we can process gecko events. Therefore, we only need it if + // we are processing native events. Disabling this is required for win32k + // syscall lockdown. + if (XRE_UseNativeEventProcessing()) { + sAppShellGeckoMsgId = ::RegisterWindowMessageW(kAppShellGeckoEventId); + NS_ASSERTION(sAppShellGeckoMsgId, + "Could not register hidden window event message!"); + + mLastNativeEventScheduled = TimeStamp::NowLoRes(); + + WNDCLASSW wc; + HINSTANCE module = GetModuleHandle(nullptr); + + const wchar_t* const kWindowClass = L"nsAppShell:EventWindowClass"; + if (!GetClassInfoW(module, kWindowClass, &wc)) { + wc.style = 0; + wc.lpfnWndProc = EventWindowProc; + wc.cbClsExtra = 0; + wc.cbWndExtra = 0; + wc.hInstance = module; + wc.hIcon = nullptr; + wc.hCursor = nullptr; + wc.hbrBackground = (HBRUSH) nullptr; + wc.lpszMenuName = (LPCWSTR) nullptr; + wc.lpszClassName = kWindowClass; + [[maybe_unused]] ATOM wcA = RegisterClassW(&wc); + MOZ_DIAGNOSTIC_ASSERT(wcA, "RegisterClassW for EventWindowClass failed"); + } + + mEventWnd = CreateWindowW(kWindowClass, L"nsAppShell:EventWindow", 0, 0, 0, + 10, 10, HWND_MESSAGE, nullptr, module, nullptr); + MOZ_DIAGNOSTIC_ASSERT(mEventWnd, "CreateWindowW for EventWindow failed"); + NS_ENSURE_STATE(mEventWnd); + } else if (XRE_IsContentProcess() && !IsWin32kLockedDown()) { + // We're not generally processing native events, but still using GDI and we + // still have some internal windows, e.g. from calling CoInitializeEx. + // So we use a class that will do a single event pump where previously we + // might have processed multiple events to make sure any occasional messages + // to these windows are processed. This also allows any internal Windows + // messages to be processed to ensure the GDI data remains fresh. + nsCOMPtr<nsIThreadInternal> threadInt = + do_QueryInterface(NS_GetCurrentThread()); + if (threadInt) { + threadInt->SetObserver(new SingleNativeEventPump()); + } + } + + if (XRE_IsParentProcess()) { + ScreenManager& screenManager = ScreenManager::GetSingleton(); + if (gfxPlatform::IsHeadless()) { + screenManager.SetHelper(mozilla::MakeUnique<HeadlessScreenHelper>()); + } else { + screenManager.SetHelper(mozilla::MakeUnique<ScreenHelperWin>()); + ScreenHelperWin::RefreshScreens(); + } + + nsCOMPtr<nsIObserverService> obsServ( + mozilla::services::GetObserverService()); + + obsServ->AddObserver(this, "sessionstore-restoring-on-startup", false); + obsServ->AddObserver(this, "sessionstore-windows-restored", false); + +#if defined(ACCESSIBILITY) + if (::GetModuleHandleW(L"uiautomationcore.dll")) { + InitUIADetection(); + } else { + obsServ->AddObserver(this, "dll-loaded-main-thread", false); + } +#endif // defined(ACCESSIBILITY) + } + + if (!WinUtils::GetTimezoneName(mTimezoneName)) { + NS_WARNING("Unable to get system timezone name, timezone may be invalid\n"); + } + + return nsBaseAppShell::Init(); +} + +NS_IMETHODIMP +nsAppShell::Run(void) { + bool wantAudio = true; + if (XRE_IsParentProcess()) { +#ifdef MOZ_BACKGROUNDTASKS + if (BackgroundTasks::IsBackgroundTaskMode()) { + wantAudio = false; + } +#endif + if (MOZ_LIKELY(wantAudio)) { + mozilla::widget::StartAudioSession(); + } + + // Add an observer that disables the screen saver when requested by Gecko. + // For example when we're playing video in the foreground tab. Whole firefox + // only needs one wakelock instance, so we would only create one listener in + // chrome process to prevent requesting unnecessary wakelock. + AddScreenWakeLockListener(); + } + + nsresult rv = nsBaseAppShell::Run(); + + if (XRE_IsParentProcess()) { + RemoveScreenWakeLockListener(); + + if (MOZ_LIKELY(wantAudio)) { + mozilla::widget::StopAudioSession(); + } + } + + return rv; +} + +NS_IMETHODIMP +nsAppShell::Exit(void) { +#if defined(ACCESSIBILITY) + if (XRE_IsParentProcess()) { + nsCOMPtr<nsIObserverService> obsServ( + mozilla::services::GetObserverService()); + obsServ->RemoveObserver(this, "dll-loaded-main-thread"); + + if (gUiaHook && ::UnhookWindowsHookEx(gUiaHook)) { + gUiaHook = nullptr; + } + } +#endif // defined(ACCESSIBILITY) + + return nsBaseAppShell::Exit(); +} + +void nsAppShell::DoProcessMoreGeckoEvents() { + // Called by nsBaseAppShell's NativeEventCallback() after it has finished + // processing pending gecko events and there are still gecko events pending + // for the thread. (This can happen if NS_ProcessPendingEvents reached it's + // starvation timeout limit.) The default behavior in nsBaseAppShell is to + // call ScheduleNativeEventCallback to post a follow up native event callback + // message. This triggers an additional call to NativeEventCallback for more + // gecko event processing. + + // There's a deadlock risk here with certain internal Windows modal loops. In + // our dispatch code, we prioritize messages so that input is handled first. + // However Windows modal dispatch loops often prioritize posted messages. If + // we find ourselves in a tight gecko timer loop where NS_ProcessPendingEvents + // takes longer than the timer duration, NS_HasPendingEvents(thread) will + // always be true. ScheduleNativeEventCallback will be called on every + // NativeEventCallback callback, and in a Windows modal dispatch loop, the + // callback message will be processed first -> input gets starved, dead lock. + + // To avoid, don't post native callback messages from NativeEventCallback + // when we're in a modal loop. This gets us back into the Windows modal + // dispatch loop dispatching input messages. Once we drop out of the modal + // loop, we use mNativeCallbackPending to fire off a final NativeEventCallback + // if we need it, which insures NS_ProcessPendingEvents gets called and all + // gecko events get processed. + if (mEventloopNestingLevel < 2) { + OnDispatchedEvent(); + mNativeCallbackPending = false; + } else { + mNativeCallbackPending = true; + } +} + +void nsAppShell::ScheduleNativeEventCallback() { + MOZ_ASSERT(mEventWnd, + "We should have created mEventWnd in Init, if this is called."); + + // Post a message to the hidden message window + ++sOutstandingNativeEventCallbacks; + { + MutexAutoLock lock(mLastNativeEventScheduledMutex); + // Time stamp this event so we can detect cases where the event gets + // dropping in sub classes / modal loops we do not control. + mLastNativeEventScheduled = TimeStamp::NowLoRes(); + } + ::PostMessage(mEventWnd, sAppShellGeckoMsgId, 0, + reinterpret_cast<LPARAM>(this)); +} + +bool nsAppShell::ProcessNextNativeEvent(bool mayWait) { + // Notify ipc we are spinning a (possibly nested) gecko event loop. + mozilla::ipc::MessageChannel::NotifyGeckoEventDispatch(); + + bool gotMessage = false; + + do { + MSG msg; + + // For avoiding deadlock between our process and plugin process by + // mouse wheel messages, we're handling actually when we receive one of + // following internal messages which is posted by native mouse wheel + // message handler. Any other events, especially native modifier key + // events, should not be handled between native message and posted + // internal message because it may make different modifier key state or + // mouse cursor position between them. + if (mozilla::widget::MouseScrollHandler::IsWaitingInternalMessage()) { + gotMessage = WinUtils::PeekMessage(&msg, nullptr, MOZ_WM_MOUSEWHEEL_FIRST, + MOZ_WM_MOUSEWHEEL_LAST, PM_REMOVE); + NS_ASSERTION(gotMessage, + "waiting internal wheel message, but it has not come"); + } + + if (!gotMessage) { + gotMessage = WinUtils::PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE); + } + + if (gotMessage) { + if (msg.message == WM_QUIT) { + ::PostQuitMessage(msg.wParam); + Exit(); + } else { + // If we had UI activity we would be processing it now so we know we + // have either kUIActivity or kActivityNoUIAVail. + mozilla::BackgroundHangMonitor().NotifyActivity(); + + if (msg.message >= WM_KEYFIRST && msg.message <= WM_KEYLAST && + IMEHandler::ProcessRawKeyMessage(msg)) { + continue; // the message is consumed. + } + +#if defined(_X86_) + // Store Printer dialog messages for reposting on x86, because on x86 + // Windows 7 they are not processed by a window procedure, but are + // explicitly waited for in the winspool.drv code that will be further + // up the stack (winspool!WaitForCompletionMessage). These are + // undocumented Windows Message identifiers found in winspool.drv. + if (msg.message == 0x5b7a || msg.message == 0x5b7f || + msg.message == 0x5b80 || msg.message == 0x5b81) { + mMsgsToRepost.push_back(msg); + continue; + } +#endif + + // Windows documentation suggets that WM_SETTINGSCHANGE is the message + // to watch for timezone changes, but experimentation showed that it + // doesn't fire on changing the timezone, but that WM_TIMECHANGE does, + // even if there's no immediate effect on the clock (e.g., changing + // from Pacific Daylight at UTC-7 to Arizona at UTC-7). + if (msg.message == WM_TIMECHANGE) { + // The message may not give us sufficient information to determine + // if the timezone changed, so keep track of it ourselves. + wchar_t systemTimezone[128]; + bool getSystemTimeSucceeded = + WinUtils::GetTimezoneName(systemTimezone); + if (getSystemTimeSucceeded && wcscmp(systemTimezone, mTimezoneName)) { + nsBaseAppShell::OnSystemTimezoneChange(); + + wcscpy_s(mTimezoneName, 128, systemTimezone); + } + } + + ::TranslateMessage(&msg); + ::DispatchMessageW(&msg); + } + } else if (mayWait) { + // Block and wait for any posted application message + mozilla::BackgroundHangMonitor().NotifyWait(); + { + AUTO_PROFILER_LABEL("nsAppShell::ProcessNextNativeEvent::Wait", IDLE); + WinUtils::WaitForMessage(); + } + } + } while (!gotMessage && mayWait); + + // See DoProcessNextNativeEvent, mEventloopNestingLevel will be + // one when a modal loop unwinds. + if (mNativeCallbackPending && mEventloopNestingLevel == 1) + DoProcessMoreGeckoEvents(); + + // Check for starved native callbacks. If we haven't processed one + // of these events in NATIVE_EVENT_STARVATION_LIMIT, fire one off. + static const mozilla::TimeDuration nativeEventStarvationLimit = + mozilla::TimeDuration::FromSeconds(NATIVE_EVENT_STARVATION_LIMIT); + + TimeDuration timeSinceLastNativeEventScheduled; + { + MutexAutoLock lock(mLastNativeEventScheduledMutex); + timeSinceLastNativeEventScheduled = + TimeStamp::NowLoRes() - mLastNativeEventScheduled; + } + if (timeSinceLastNativeEventScheduled > nativeEventStarvationLimit) { + ScheduleNativeEventCallback(); + } + + return gotMessage; +} + +nsresult nsAppShell::AfterProcessNextEvent(nsIThreadInternal* /* unused */, + bool /* unused */) { + if (!mMsgsToRepost.empty()) { + for (MSG msg : mMsgsToRepost) { + ::PostMessageW(msg.hwnd, msg.message, msg.wParam, msg.lParam); + } + mMsgsToRepost.clear(); + } + return NS_OK; +} |