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gecko-dev/widget/cocoa/nsAppShell.mm

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/* -*- 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/. */
/*
* Runs the main native Cocoa run loop, interrupting it as needed to process
* Gecko events.
*/
#import <Cocoa/Cocoa.h>
#include "CustomCocoaEvents.h"
#include "mozilla/WidgetTraceEvent.h"
#include "nsAppShell.h"
#include "gfxPlatform.h"
#include "nsCOMPtr.h"
#include "nsIFile.h"
#include "nsDirectoryServiceDefs.h"
#include "nsString.h"
#include "nsIRollupListener.h"
#include "nsIWidget.h"
#include "nsThreadUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsObjCExceptions.h"
#include "nsCocoaFeatures.h"
#include "nsCocoaUtils.h"
#include "nsChildView.h"
#include "nsToolkit.h"
#include "TextInputHandler.h"
#include "mozilla/BackgroundHangMonitor.h"
#include "GeckoProfiler.h"
#include "ScreenHelperCocoa.h"
#include "mozilla/Hal.h"
#include "mozilla/widget/ScreenManager.h"
#include "HeadlessScreenHelper.h"
#include "pratom.h"
#if !defined(RELEASE_OR_BETA) || defined(DEBUG)
# include "nsSandboxViolationSink.h"
#endif
#include <IOKit/pwr_mgt/IOPMLib.h>
#include "nsIDOMWakeLockListener.h"
#include "nsIPowerManagerService.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
using namespace mozilla;
using namespace mozilla::widget;
#define WAKE_LOCK_LOG(...) MOZ_LOG(gMacWakeLockLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
static mozilla::LazyLogModule gMacWakeLockLog("MacWakeLock");
// A wake lock listener that disables screen saver when requested by
// Gecko. For example when we're playing video in a foreground tab we
// don't want the screen saver to turn on.
class MacWakeLockListener final : public nsIDOMMozWakeLockListener {
public:
NS_DECL_ISUPPORTS;
private:
~MacWakeLockListener() {}
IOPMAssertionID mAssertionNoDisplaySleepID = kIOPMNullAssertionID;
IOPMAssertionID mAssertionNoIdleSleepID = kIOPMNullAssertionID;
NS_IMETHOD Callback(const nsAString& aTopic, const nsAString& aState) override {
if (!aTopic.EqualsASCII("screen") && !aTopic.EqualsASCII("audio-playing") &&
!aTopic.EqualsASCII("video-playing")) {
return NS_OK;
}
// we should still hold the lock for background audio.
if (aTopic.EqualsASCII("audio-playing") && aState.EqualsASCII("locked-background")) {
WAKE_LOCK_LOG("keep audio playing even in background");
return NS_OK;
}
bool shouldKeepDisplayOn = aTopic.EqualsASCII("screen") || aTopic.EqualsASCII("video-playing");
CFStringRef assertionType =
shouldKeepDisplayOn ? kIOPMAssertionTypeNoDisplaySleep : kIOPMAssertionTypeNoIdleSleep;
IOPMAssertionID& assertionId =
shouldKeepDisplayOn ? mAssertionNoDisplaySleepID : mAssertionNoIdleSleepID;
WAKE_LOCK_LOG("topic=%s, state=%s, shouldKeepDisplayOn=%d", NS_ConvertUTF16toUTF8(aTopic).get(),
NS_ConvertUTF16toUTF8(aState).get(), shouldKeepDisplayOn);
// Note the wake lock code ensures that we're not sent duplicate
// "locked-foreground" notifications when multiple wake locks are held.
if (aState.EqualsASCII("locked-foreground")) {
if (assertionId != kIOPMNullAssertionID) {
WAKE_LOCK_LOG("already has a lock");
return NS_OK;
}
// Prevent screen saver.
CFStringRef cf_topic = ::CFStringCreateWithCharacters(
kCFAllocatorDefault, reinterpret_cast<const UniChar*>(aTopic.Data()), aTopic.Length());
IOReturn success = ::IOPMAssertionCreateWithName(assertionType, kIOPMAssertionLevelOn,
cf_topic, &assertionId);
CFRelease(cf_topic);
if (success != kIOReturnSuccess) {
WAKE_LOCK_LOG("failed to disable screensaver");
}
WAKE_LOCK_LOG("create screensaver");
} else {
// Re-enable screen saver.
if (assertionId != kIOPMNullAssertionID) {
IOReturn result = ::IOPMAssertionRelease(assertionId);
if (result != kIOReturnSuccess) {
WAKE_LOCK_LOG("failed to release screensaver");
}
WAKE_LOCK_LOG("Release screensaver");
assertionId = kIOPMNullAssertionID;
}
}
return NS_OK;
}
}; // MacWakeLockListener
// defined in nsCocoaWindow.mm
extern int32_t gXULModalLevel;
static bool gAppShellMethodsSwizzled = false;
@implementation GeckoNSApplication
- (void)sendEvent:(NSEvent*)anEvent {
// Mark this function as non-idle because it's one of the exit points from
// the event loop (running inside of -[GeckoNSApplication nextEventMatchingMask:...])
// into non-idle code. So we basically unset the IDLE category from the inside.
AUTO_PROFILER_LABEL("-[GeckoNSApplication sendEvent:]", OTHER);
mozilla::BackgroundHangMonitor().NotifyActivity();
if ([anEvent type] == NSApplicationDefined && [anEvent subtype] == kEventSubtypeTrace) {
mozilla::SignalTracerThread();
return;
}
[super sendEvent:anEvent];
}
#if defined(MAC_OS_X_VERSION_10_12) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12 && \
__LP64__
// 10.12 changed `mask` to NSEventMask (unsigned long long) for x86_64 builds.
- (NSEvent*)nextEventMatchingMask:(NSEventMask)mask
#else
- (NSEvent*)nextEventMatchingMask:(NSUInteger)mask
#endif
untilDate:(NSDate*)expiration
inMode:(NSString*)mode
dequeue:(BOOL)flag {
// When we're waiting in the event loop, this is the last function under our
// control that's on the stack, so this is the function that we mark with the
// IDLE category.
// However, when we're processing an event or when our CFRunLoopSource runs,
// this function is still on the stack - "the event loop calls us". So we
// need to mark functions that enter non-idle code with a different profiler
// category, usually OTHER. This gives the profiler a rough approximation of
// idleness but isn't perfect. For example, sometimes there's some Cocoa-
// internal activity that's triggered from the event loop, and we'll
// misidentify the stacks for that activity as idle because there's no Gecko
// code on the stack that can change the stack's category to something
// non-idle.
AUTO_PROFILER_LABEL("-[GeckoNSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]",
IDLE);
if (expiration) {
mozilla::BackgroundHangMonitor().NotifyWait();
}
NSEvent* nextEvent = [super nextEventMatchingMask:mask
untilDate:expiration
inMode:mode
dequeue:flag];
if (expiration) {
mozilla::BackgroundHangMonitor().NotifyActivity();
}
return nextEvent;
}
@end
// AppShellDelegate
//
// Cocoa bridge class. An object of this class is registered to receive
// notifications.
//
@interface AppShellDelegate : NSObject {
@private
nsAppShell* mAppShell;
}
- (id)initWithAppShell:(nsAppShell*)aAppShell;
- (void)applicationWillTerminate:(NSNotification*)aNotification;
- (void)beginMenuTracking:(NSNotification*)aNotification;
@end
// nsAppShell implementation
NS_IMETHODIMP
nsAppShell::ResumeNative(void) {
nsresult retval = nsBaseAppShell::ResumeNative();
if (NS_SUCCEEDED(retval) && (mSuspendNativeCount == 0) && mSkippedNativeCallback) {
mSkippedNativeCallback = false;
ScheduleNativeEventCallback();
}
return retval;
}
nsAppShell::nsAppShell()
: mAutoreleasePools(nullptr),
mDelegate(nullptr),
mCFRunLoop(NULL),
mCFRunLoopSource(NULL),
mRunningEventLoop(false),
mStarted(false),
mTerminated(false),
mSkippedNativeCallback(false),
mNativeEventCallbackDepth(0),
mNativeEventScheduledDepth(0) {
// A Cocoa event loop is running here if (and only if) we've been embedded
// by a Cocoa app.
mRunningCocoaEmbedded = [NSApp isRunning] ? true : false;
}
nsAppShell::~nsAppShell() {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
hal::Shutdown();
if (mCFRunLoop) {
if (mCFRunLoopSource) {
::CFRunLoopRemoveSource(mCFRunLoop, mCFRunLoopSource, kCFRunLoopCommonModes);
::CFRelease(mCFRunLoopSource);
}
::CFRelease(mCFRunLoop);
}
if (mAutoreleasePools) {
NS_ASSERTION(::CFArrayGetCount(mAutoreleasePools) == 0,
"nsAppShell destroyed without popping all autorelease pools");
::CFRelease(mAutoreleasePools);
}
[mDelegate release];
NS_OBJC_END_TRY_ABORT_BLOCK
}
NS_IMPL_ISUPPORTS(MacWakeLockListener, nsIDOMMozWakeLockListener)
mozilla::StaticRefPtr<MacWakeLockListener> sWakeLockListener;
static void AddScreenWakeLockListener() {
nsCOMPtr<nsIPowerManagerService> sPowerManagerService =
do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (sPowerManagerService) {
sWakeLockListener = new MacWakeLockListener();
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;
}
}
// An undocumented CoreGraphics framework method, present in the same form
// since at least OS X 10.5.
extern "C" CGError CGSSetDebugOptions(int options);
// Init
//
// Loads the nib (see bug 316076c21) and sets up the CFRunLoopSource used to
// interrupt the main native run loop.
//
// public
nsresult nsAppShell::Init() {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
// No event loop is running yet (unless an embedding app that uses
// NSApplicationMain() is running).
NSAutoreleasePool* localPool = [[NSAutoreleasePool alloc] init];
// mAutoreleasePools is used as a stack of NSAutoreleasePool objects created
// by |this|. CFArray is used instead of NSArray because NSArray wants to
// retain each object you add to it, and you can't retain an
// NSAutoreleasePool.
mAutoreleasePools = ::CFArrayCreateMutable(nullptr, 0, nullptr);
NS_ENSURE_STATE(mAutoreleasePools);
bool isNSApplicationProcessType = (XRE_GetProcessType() != GeckoProcessType_RDD) &&
(XRE_GetProcessType() != GeckoProcessType_Socket);
if (isNSApplicationProcessType) {
// This call initializes NSApplication unless:
// 1) we're using xre -- NSApp's already been initialized by
// MacApplicationDelegate.mm's EnsureUseCocoaDockAPI().
// 2) an embedding app that uses NSApplicationMain() is running -- NSApp's
// already been initialized and its main run loop is already running.
[[NSBundle mainBundle] loadNibNamed:@"res/MainMenu"
owner:[GeckoNSApplication sharedApplication]
topLevelObjects:nil];
}
mDelegate = [[AppShellDelegate alloc] initWithAppShell:this];
NS_ENSURE_STATE(mDelegate);
// Add a CFRunLoopSource to the main native run loop. The source is
// responsible for interrupting the run loop when Gecko events are ready.
mCFRunLoop = [[NSRunLoop currentRunLoop] getCFRunLoop];
NS_ENSURE_STATE(mCFRunLoop);
::CFRetain(mCFRunLoop);
CFRunLoopSourceContext context;
bzero(&context, sizeof(context));
// context.version = 0;
context.info = this;
context.perform = ProcessGeckoEvents;
mCFRunLoopSource = ::CFRunLoopSourceCreate(kCFAllocatorDefault, 0, &context);
NS_ENSURE_STATE(mCFRunLoopSource);
::CFRunLoopAddSource(mCFRunLoop, mCFRunLoopSource, kCFRunLoopCommonModes);
hal::Init();
if (XRE_IsParentProcess()) {
ScreenManager& screenManager = ScreenManager::GetSingleton();
if (gfxPlatform::IsHeadless()) {
screenManager.SetHelper(mozilla::MakeUnique<HeadlessScreenHelper>());
} else {
screenManager.SetHelper(mozilla::MakeUnique<ScreenHelperCocoa>());
}
}
nsresult rv = nsBaseAppShell::Init();
if (isNSApplicationProcessType && !gAppShellMethodsSwizzled) {
// We should only replace the original terminate: method if we're not
// running in a Cocoa embedder. See bug 604901.
if (!mRunningCocoaEmbedded) {
nsToolkit::SwizzleMethods([NSApplication class], @selector(terminate:),
@selector(nsAppShell_NSApplication_terminate:));
}
gAppShellMethodsSwizzled = true;
}
// The bug that this works around was introduced in OS X 10.10.0
// and fixed in OS X 10.10.2. Order these version checks so as
// few as possible will actually end up running.
if (nsCocoaFeatures::macOSVersionMinor() == 10 && nsCocoaFeatures::macOSVersionBugFix() < 2 &&
nsCocoaFeatures::macOSVersionMajor() == 10) {
// Explicitly turn off CGEvent logging. This works around bug 1092855.
// If there are already CGEvents in the log, turning off logging also
// causes those events to be written to disk. But at this point no
// CGEvents have yet been processed. CGEvents are events (usually
// input events) pulled from the WindowServer. An option of 0x80000008
// turns on CGEvent logging.
CGSSetDebugOptions(0x80000007);
}
#if !defined(RELEASE_OR_BETA) || defined(DEBUG)
if (Preferences::GetBool("security.sandbox.mac.track.violations", false)) {
nsSandboxViolationSink::Start();
}
#endif
[localPool release];
return rv;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
// ProcessGeckoEvents
//
// The "perform" target of mCFRunLoop, called when mCFRunLoopSource is
// signalled from ScheduleNativeEventCallback.
//
// Arrange for Gecko events to be processed on demand (in response to a call
// to ScheduleNativeEventCallback(), if processing of Gecko events via "native
// methods" hasn't been suspended). This happens in NativeEventCallback().
//
// protected static
void nsAppShell::ProcessGeckoEvents(void* aInfo) {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
AUTO_PROFILER_LABEL("nsAppShell::ProcessGeckoEvents", OTHER);
nsAppShell* self = static_cast<nsAppShell*>(aInfo);
if (self->mRunningEventLoop) {
self->mRunningEventLoop = false;
// The run loop may be sleeping -- [NSRunLoop runMode:...]
// won't return until it's given a reason to wake up. Awaken it by
// posting a bogus event. There's no need to make the event
// presentable.
//
// But _don't_ set windowNumber to '-1' -- that can lead to nasty
// weirdness like bmo bug 397039 (a crash in [NSApp sendEvent:] on one of
// these fake events, because the -1 has gotten changed into the number
// of an actual NSWindow object, and that NSWindow object has just been
// destroyed). Setting windowNumber to '0' seems to work fine -- this
// seems to prevent the OS from ever trying to associate our bogus event
// with a particular NSWindow object.
[NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
location:NSMakePoint(0, 0)
modifierFlags:0
timestamp:0
windowNumber:0
context:NULL
subtype:kEventSubtypeNone
data1:0
data2:0]
atStart:NO];
}
if (self->mSuspendNativeCount <= 0) {
++self->mNativeEventCallbackDepth;
self->NativeEventCallback();
--self->mNativeEventCallbackDepth;
} else {
self->mSkippedNativeCallback = true;
}
// Still needed to avoid crashes on quit in most Mochitests.
[NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
location:NSMakePoint(0, 0)
modifierFlags:0
timestamp:0
windowNumber:0
context:NULL
subtype:kEventSubtypeNone
data1:0
data2:0]
atStart:NO];
// Normally every call to ScheduleNativeEventCallback() results in
// exactly one call to ProcessGeckoEvents(). So each Release() here
// normally balances exactly one AddRef() in ScheduleNativeEventCallback().
// But if Exit() is called just after ScheduleNativeEventCallback(), the
// corresponding call to ProcessGeckoEvents() will never happen. We check
// for this possibility in two different places -- here and in Exit()
// itself. If we find here that Exit() has been called (that mTerminated
// is true), it's because we've been called recursively, that Exit() was
// called from self->NativeEventCallback() above, and that we're unwinding
// the recursion. In this case we'll never be called again, and we balance
// here any extra calls to ScheduleNativeEventCallback().
//
// When ProcessGeckoEvents() is called recursively, it's because of a
// call to ScheduleNativeEventCallback() from NativeEventCallback(). We
// balance the "extra" AddRefs here (rather than always in Exit()) in order
// to ensure that 'self' stays alive until the end of this method. We also
// make sure not to finish the balancing until all the recursion has been
// unwound.
if (self->mTerminated) {
int32_t releaseCount = 0;
if (self->mNativeEventScheduledDepth > self->mNativeEventCallbackDepth) {
releaseCount =
PR_ATOMIC_SET(&self->mNativeEventScheduledDepth, self->mNativeEventCallbackDepth);
}
while (releaseCount-- > self->mNativeEventCallbackDepth) self->Release();
} else {
// As best we can tell, every call to ProcessGeckoEvents() is triggered
// by a call to ScheduleNativeEventCallback(). But we've seen a few
// (non-reproducible) cases of double-frees that *might* have been caused
// by spontaneous calls (from the OS) to ProcessGeckoEvents(). So we
// deal with that possibility here.
if (PR_ATOMIC_DECREMENT(&self->mNativeEventScheduledDepth) < 0) {
PR_ATOMIC_SET(&self->mNativeEventScheduledDepth, 0);
NS_WARNING("Spontaneous call to ProcessGeckoEvents()!");
} else {
self->Release();
}
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
// WillTerminate
//
// Called by the AppShellDelegate when an NSApplicationWillTerminate
// notification is posted. After this method is called, native events should
// no longer be processed. The NSApplicationWillTerminate notification is
// only posted when [NSApp terminate:] is called, which doesn't happen on a
// "normal" application quit.
//
// public
void nsAppShell::WillTerminate() {
if (mTerminated) return;
// Make sure that the nsAppExitEvent posted by nsAppStartup::Quit() (called
// from [MacApplicationDelegate applicationShouldTerminate:]) gets run.
NS_ProcessPendingEvents(NS_GetCurrentThread());
mTerminated = true;
}
// ScheduleNativeEventCallback
//
// Called (possibly on a non-main thread) when Gecko has an event that
// needs to be processed. The Gecko event needs to be processed on the
// main thread, so the native run loop must be interrupted.
//
// In nsBaseAppShell.cpp, the mNativeEventPending variable is used to
// ensure that ScheduleNativeEventCallback() is called no more than once
// per call to NativeEventCallback(). ProcessGeckoEvents() can skip its
// call to NativeEventCallback() if processing of Gecko events by native
// means is suspended (using nsIAppShell::SuspendNative()), which will
// suspend calls from nsBaseAppShell::OnDispatchedEvent() to
// ScheduleNativeEventCallback(). But when Gecko event processing by
// native means is resumed (in ResumeNative()), an extra call is made to
// ScheduleNativeEventCallback() (from ResumeNative()). This triggers
// another call to ProcessGeckoEvents(), which calls NativeEventCallback(),
// and nsBaseAppShell::OnDispatchedEvent() resumes calling
// ScheduleNativeEventCallback().
//
// protected virtual
void nsAppShell::ScheduleNativeEventCallback() {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if (mTerminated) return;
// Each AddRef() here is normally balanced by exactly one Release() in
// ProcessGeckoEvents(). But there are exceptions, for which see
// ProcessGeckoEvents() and Exit().
NS_ADDREF_THIS();
PR_ATOMIC_INCREMENT(&mNativeEventScheduledDepth);
// This will invoke ProcessGeckoEvents on the main thread.
::CFRunLoopSourceSignal(mCFRunLoopSource);
::CFRunLoopWakeUp(mCFRunLoop);
NS_OBJC_END_TRY_ABORT_BLOCK;
}
// Undocumented Cocoa Event Manager function, present in the same form since
// at least OS X 10.6.
extern "C" EventAttributes GetEventAttributes(EventRef inEvent);
// ProcessNextNativeEvent
//
// If aMayWait is false, process a single native event. If it is true, run
// the native run loop until stopped by ProcessGeckoEvents.
//
// Returns true if more events are waiting in the native event queue.
//
// protected virtual
bool nsAppShell::ProcessNextNativeEvent(bool aMayWait) {
bool moreEvents = false;
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
bool eventProcessed = false;
NSString* currentMode = nil;
if (mTerminated) return false;
bool wasRunningEventLoop = mRunningEventLoop;
mRunningEventLoop = aMayWait;
NSDate* waitUntil = nil;
if (aMayWait) waitUntil = [NSDate distantFuture];
NSRunLoop* currentRunLoop = [NSRunLoop currentRunLoop];
EventQueueRef currentEventQueue = GetCurrentEventQueue();
EventTargetRef eventDispatcherTarget = GetEventDispatcherTarget();
if (aMayWait) {
mozilla::BackgroundHangMonitor().NotifyWait();
}
// Only call -[NSApp sendEvent:] (and indirectly send user-input events to
// Gecko) if aMayWait is true. Tbis ensures most calls to -[NSApp
// sendEvent:] happen under nsAppShell::Run(), at the lowest level of
// recursion -- thereby making it less likely Gecko will process user-input
// events in the wrong order or skip some of them. It also avoids eating
// too much CPU in nsBaseAppShell::OnProcessNextEvent() (which calls
// us) -- thereby avoiding the starvation of nsIRunnable events in
// nsThread::ProcessNextEvent(). For more information see bug 996848.
do {
// No autorelease pool is provided here, because OnProcessNextEvent
// and AfterProcessNextEvent are responsible for maintaining it.
NS_ASSERTION(mAutoreleasePools && ::CFArrayGetCount(mAutoreleasePools),
"No autorelease pool for native event");
if (aMayWait) {
currentMode = [currentRunLoop currentMode];
if (!currentMode) currentMode = NSDefaultRunLoopMode;
NSEvent* nextEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:waitUntil
inMode:currentMode
dequeue:YES];
if (nextEvent) {
mozilla::BackgroundHangMonitor().NotifyActivity();
[NSApp sendEvent:nextEvent];
eventProcessed = true;
}
} else {
// AcquireFirstMatchingEventInQueue() doesn't spin the (native) event
// loop, though it does queue up any newly available events from the
// window server.
EventRef currentEvent =
AcquireFirstMatchingEventInQueue(currentEventQueue, 0, NULL, kEventQueueOptionsNone);
if (!currentEvent) {
continue;
}
EventAttributes attrs = GetEventAttributes(currentEvent);
UInt32 eventKind = GetEventKind(currentEvent);
UInt32 eventClass = GetEventClass(currentEvent);
bool osCocoaEvent = ((eventClass == 'appl') || (eventClass == kEventClassAppleEvent) ||
((eventClass == 'cgs ') && (eventKind != NSApplicationDefined)));
// If attrs is kEventAttributeUserEvent or kEventAttributeMonitored
// (i.e. a user input event), we shouldn't process it here while
// aMayWait is false. Likewise if currentEvent will eventually be
// turned into an OS-defined Cocoa event, or otherwise needs AppKit
// processing. Doing otherwise risks doing too much work here, and
// preventing the event from being properly processed by the AppKit
// framework.
if ((attrs != kEventAttributeNone) || osCocoaEvent) {
// Since we can't process the next event here (while aMayWait is false),
// we want moreEvents to be false on return.
eventProcessed = false;
// This call to ReleaseEvent() matches a call to RetainEvent() in
// AcquireFirstMatchingEventInQueue() above.
ReleaseEvent(currentEvent);
break;
}
// This call to RetainEvent() matches a call to ReleaseEvent() in
// RemoveEventFromQueue() below.
RetainEvent(currentEvent);
RemoveEventFromQueue(currentEventQueue, currentEvent);
SendEventToEventTarget(currentEvent, eventDispatcherTarget);
// This call to ReleaseEvent() matches a call to RetainEvent() in
// AcquireFirstMatchingEventInQueue() above.
ReleaseEvent(currentEvent);
eventProcessed = true;
}
} while (mRunningEventLoop);
if (eventProcessed) {
moreEvents = (AcquireFirstMatchingEventInQueue(currentEventQueue, 0, NULL,
kEventQueueOptionsNone) != NULL);
}
mRunningEventLoop = wasRunningEventLoop;
NS_OBJC_END_TRY_ABORT_BLOCK;
if (!moreEvents) {
nsChildView::UpdateCurrentInputEventCount();
}
return moreEvents;
}
// Run
//
// Overrides the base class's Run() method to call [NSApp run] (which spins
// the native run loop until the application quits). Since (unlike the base
// class's Run() method) we don't process any Gecko events here, they need
// to be processed elsewhere (in NativeEventCallback(), called from
// ProcessGeckoEvents()).
//
// Camino called [NSApp run] on its own (via NSApplicationMain()), and so
// didn't call nsAppShell::Run().
//
// public
NS_IMETHODIMP
nsAppShell::Run(void) {
NS_ASSERTION(!mStarted, "nsAppShell::Run() called multiple times");
if (mStarted || mTerminated) return NS_OK;
mStarted = true;
if (XRE_IsParentProcess()) {
AddScreenWakeLockListener();
}
// We use the native Gecko event loop in content processes.
nsresult rv = NS_OK;
if (XRE_UseNativeEventProcessing()) {
NS_OBJC_TRY_ABORT([NSApp run]);
} else {
rv = nsBaseAppShell::Run();
}
if (XRE_IsParentProcess()) {
RemoveScreenWakeLockListener();
}
return rv;
}
NS_IMETHODIMP
nsAppShell::Exit(void) {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
// This method is currently called more than once -- from (according to
// mento) an nsAppExitEvent dispatched by nsAppStartup::Quit() and from an
// XPCOM shutdown notification that nsBaseAppShell has registered to
// receive. So we need to ensure that multiple calls won't break anything.
// But we should also complain about it (since it isn't quite kosher).
if (mTerminated) {
NS_WARNING("nsAppShell::Exit() called redundantly");
return NS_OK;
}
mTerminated = true;
#if !defined(RELEASE_OR_BETA) || defined(DEBUG)
nsSandboxViolationSink::Stop();
#endif
// Quoting from Apple's doc on the [NSApplication stop:] method (from their
// doc on the NSApplication class): "If this method is invoked during a
// modal event loop, it will break that loop but not the main event loop."
// nsAppShell::Exit() shouldn't be called from a modal event loop. So if
// it is we complain about it (to users of debug builds) and call [NSApp
// stop:] one extra time. (I'm not sure if modal event loops can be nested
// -- Apple's docs don't say one way or the other. But the return value
// of [NSApp _isRunningModal] doesn't change immediately after a call to
// [NSApp stop:], so we have to assume that one extra call to [NSApp stop:]
// will do the job.)
BOOL cocoaModal = [NSApp _isRunningModal];
NS_ASSERTION(!cocoaModal, "Don't call nsAppShell::Exit() from a modal event loop!");
if (cocoaModal) [NSApp stop:nullptr];
[NSApp stop:nullptr];
// A call to Exit() just after a call to ScheduleNativeEventCallback()
// prevents the (normally) matching call to ProcessGeckoEvents() from
// happening. If we've been called from ProcessGeckoEvents() (as usually
// happens), we take care of it there. But if we have an unbalanced call
// to ScheduleNativeEventCallback() and ProcessGeckoEvents() isn't on the
// stack, we need to take care of the problem here.
if (!mNativeEventCallbackDepth && mNativeEventScheduledDepth) {
int32_t releaseCount = PR_ATOMIC_SET(&mNativeEventScheduledDepth, 0);
while (releaseCount-- > 0) NS_RELEASE_THIS();
}
return nsBaseAppShell::Exit();
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
// OnProcessNextEvent
//
// This nsIThreadObserver method is called prior to processing an event.
// Set up an autorelease pool that will service any autoreleased Cocoa
// objects during this event. This includes native events processed by
// ProcessNextNativeEvent. The autorelease pool will be popped by
// AfterProcessNextEvent, it is important for these two methods to be
// tightly coupled.
//
// public
NS_IMETHODIMP
nsAppShell::OnProcessNextEvent(nsIThreadInternal* aThread, bool aMayWait) {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
NS_ASSERTION(mAutoreleasePools, "No stack on which to store autorelease pool");
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
::CFArrayAppendValue(mAutoreleasePools, pool);
return nsBaseAppShell::OnProcessNextEvent(aThread, aMayWait);
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
// AfterProcessNextEvent
//
// This nsIThreadObserver method is called after event processing is complete.
// The Cocoa implementation cleans up the autorelease pool create by the
// previous OnProcessNextEvent call.
//
// public
NS_IMETHODIMP
nsAppShell::AfterProcessNextEvent(nsIThreadInternal* aThread, bool aEventWasProcessed) {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
CFIndex count = ::CFArrayGetCount(mAutoreleasePools);
NS_ASSERTION(mAutoreleasePools && count, "Processed an event, but there's no autorelease pool?");
const NSAutoreleasePool* pool =
static_cast<const NSAutoreleasePool*>(::CFArrayGetValueAtIndex(mAutoreleasePools, count - 1));
::CFArrayRemoveValueAtIndex(mAutoreleasePools, count - 1);
[pool release];
return nsBaseAppShell::AfterProcessNextEvent(aThread, aEventWasProcessed);
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
// AppShellDelegate implementation
@implementation AppShellDelegate
// initWithAppShell:
//
// Constructs the AppShellDelegate object
- (id)initWithAppShell:(nsAppShell*)aAppShell {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if ((self = [self init])) {
mAppShell = aAppShell;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationWillTerminate:)
name:NSApplicationWillTerminateNotification
object:NSApp];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationDidBecomeActive:)
name:NSApplicationDidBecomeActiveNotification
object:NSApp];
[[NSDistributedNotificationCenter defaultCenter]
addObserver:self
selector:@selector(beginMenuTracking:)
name:@"com.apple.HIToolbox.beginMenuTrackingNotification"
object:nil];
}
return self;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (void)dealloc {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSDistributedNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
NS_OBJC_END_TRY_ABORT_BLOCK;
}
// applicationWillTerminate:
//
// Notify the nsAppShell that native event processing should be discontinued.
- (void)applicationWillTerminate:(NSNotification*)aNotification {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
mAppShell->WillTerminate();
NS_OBJC_END_TRY_ABORT_BLOCK;
}
// applicationDidBecomeActive
//
// Make sure TextInputHandler::sLastModifierState is updated when we become
// active (since we won't have received [ChildView flagsChanged:] messages
// while inactive).
- (void)applicationDidBecomeActive:(NSNotification*)aNotification {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
// [NSEvent modifierFlags] is valid on every kind of event, so we don't need
// to worry about getting an NSInternalInconsistencyException here.
NSEvent* currentEvent = [NSApp currentEvent];
if (currentEvent) {
TextInputHandler::sLastModifierState =
[currentEvent modifierFlags] & NSDeviceIndependentModifierFlagsMask;
}
nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(nullptr, NS_WIDGET_MAC_APP_ACTIVATE_OBSERVER_TOPIC, nullptr);
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
// beginMenuTracking
//
// Roll up our context menu (if any) when some other app (or the OS) opens
// any sort of menu. But make sure we don't do this for notifications we
// send ourselves (whose 'sender' will be @"org.mozilla.gecko.PopupWindow").
- (void)beginMenuTracking:(NSNotification*)aNotification {
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
NSString* sender = [aNotification object];
if (!sender || ![sender isEqualToString:@"org.mozilla.gecko.PopupWindow"]) {
nsIRollupListener* rollupListener = nsBaseWidget::GetActiveRollupListener();
nsCOMPtr<nsIWidget> rollupWidget = rollupListener->GetRollupWidget();
if (rollupWidget) rollupListener->Rollup(0, true, nullptr, nullptr);
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
@end
// We hook terminate: in order to make OS-initiated termination work nicely
// with Gecko's shutdown sequence. (Two ways to trigger OS-initiated
// termination: 1) Quit from the Dock menu; 2) Log out from (or shut down)
// your computer while the browser is active.)
@interface NSApplication (MethodSwizzling)
- (void)nsAppShell_NSApplication_terminate:(id)sender;
@end
@implementation NSApplication (MethodSwizzling)
// Called by the OS after [MacApplicationDelegate applicationShouldTerminate:]
// has returned NSTerminateNow. This method "subclasses" and replaces the
// OS's original implementation. The only thing the orginal method does which
// we need is that it posts NSApplicationWillTerminateNotification. Everything
// else is unneeded (because it's handled elsewhere), or actively interferes
// with Gecko's shutdown sequence. For example the original terminate: method
// causes the app to exit() inside [NSApp run] (called from nsAppShell::Run()
// above), which means that nothing runs after the call to nsAppStartup::Run()
// in XRE_Main(), which in particular means that ScopedXPCOMStartup's destructor
// and NS_ShutdownXPCOM() never get called.
- (void)nsAppShell_NSApplication_terminate:(id)sender {
[[NSNotificationCenter defaultCenter] postNotificationName:NSApplicationWillTerminateNotification
object:NSApp];
}
@end
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