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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 <dlfcn.h>
#include "CustomCocoaEvents.h"
#include "mozilla/WidgetTraceEvent.h"
#include "nsAppShell.h"
#include "nsCOMPtr.h"
#include "nsIFile.h"
#include "nsDirectoryServiceDefs.h"
#include "nsString.h"
#include "nsIRollupListener.h"
#include "nsIWidget.h"
#include "nsThreadUtils.h"
#include "nsIWindowMediator.h"
#include "nsServiceManagerUtils.h"
#include "nsIInterfaceRequestor.h"
#include "nsIWebBrowserChrome.h"
#include "nsObjCExceptions.h"
#include "nsCocoaFeatures.h"
#include "nsCocoaUtils.h"
#include "nsChildView.h"
#include "nsToolkit.h"
#include "TextInputHandler.h"
#include "mozilla/HangMonitor.h"
#include "sampler.h"
#include "npapi.h"
using namespace mozilla::widget;
// defined in nsCocoaWindow.mm
extern int32_t gXULModalLevel;
static bool gAppShellMethodsSwizzled = false;
// List of current Cocoa app-modal windows (nested if more than one).
nsCocoaAppModalWindowList *gCocoaAppModalWindowList = NULL;
// Push a Cocoa app-modal window onto the top of our list.
nsresult nsCocoaAppModalWindowList::PushCocoa(NSWindow *aWindow, NSModalSession aSession)
{
NS_ENSURE_STATE(aWindow && aSession);
mList.AppendElement(nsCocoaAppModalWindowListItem(aWindow, aSession));
return NS_OK;
}
// Pop the topmost Cocoa app-modal window off our list. aWindow and aSession
// are just used to check that it's what we expect it to be.
nsresult nsCocoaAppModalWindowList::PopCocoa(NSWindow *aWindow, NSModalSession aSession)
{
NS_ENSURE_STATE(aWindow && aSession);
for (int i = mList.Length(); i > 0; --i) {
nsCocoaAppModalWindowListItem &item = mList.ElementAt(i - 1);
if (item.mSession) {
NS_ASSERTION((item.mWindow == aWindow) && (item.mSession == aSession),
"PopCocoa() called without matching call to PushCocoa()!");
mList.RemoveElementAt(i - 1);
return NS_OK;
}
}
NS_ERROR("PopCocoa() called without matching call to PushCocoa()!");
return NS_ERROR_FAILURE;
}
// Push a Gecko-modal window onto the top of our list.
nsresult nsCocoaAppModalWindowList::PushGecko(NSWindow *aWindow, nsCocoaWindow *aWidget)
{
NS_ENSURE_STATE(aWindow && aWidget);
mList.AppendElement(nsCocoaAppModalWindowListItem(aWindow, aWidget));
return NS_OK;
}
// Pop the topmost Gecko-modal window off our list. aWindow and aWidget are
// just used to check that it's what we expect it to be.
nsresult nsCocoaAppModalWindowList::PopGecko(NSWindow *aWindow, nsCocoaWindow *aWidget)
{
NS_ENSURE_STATE(aWindow && aWidget);
for (int i = mList.Length(); i > 0; --i) {
nsCocoaAppModalWindowListItem &item = mList.ElementAt(i - 1);
if (item.mWidget) {
NS_ASSERTION((item.mWindow == aWindow) && (item.mWidget == aWidget),
"PopGecko() called without matching call to PushGecko()!");
mList.RemoveElementAt(i - 1);
return NS_OK;
}
}
NS_ERROR("PopGecko() called without matching call to PushGecko()!");
return NS_ERROR_FAILURE;
}
// The "current session" is normally the "session" corresponding to the
// top-most Cocoa app-modal window (both on the screen and in our list).
// But because Cocoa app-modal dialog can be "interrupted" by a Gecko-modal
// dialog, the top-most Cocoa app-modal dialog may already have finished
// (and no longer be visible). In this case we need to check the list for
// the "next" visible Cocoa app-modal window (and return its "session"), or
// (if no Cocoa app-modal window is visible) return nil. This way we ensure
// (as we need to) that all nested Cocoa app-modal sessions are dealt with
// before we get to any Gecko-modal session(s). See nsAppShell::
// ProcessNextNativeEvent() below.
NSModalSession nsCocoaAppModalWindowList::CurrentSession()
{
if (![NSApp _isRunningAppModal])
return nil;
NSModalSession currentSession = nil;
for (int i = mList.Length(); i > 0; --i) {
nsCocoaAppModalWindowListItem &item = mList.ElementAt(i - 1);
if (item.mSession && [item.mWindow isVisible]) {
currentSession = item.mSession;
break;
}
}
return currentSession;
}
// Has a Gecko modal dialog popped up over a Cocoa app-modal dialog?
bool nsCocoaAppModalWindowList::GeckoModalAboveCocoaModal()
{
if (mList.IsEmpty())
return false;
nsCocoaAppModalWindowListItem &topItem = mList.ElementAt(mList.Length() - 1);
return (topItem.mWidget != nullptr);
}
@implementation GeckoNSApplication
- (void)sendEvent:(NSEvent *)anEvent
{
mozilla::HangMonitor::NotifyActivity();
if ([anEvent type] == NSApplicationDefined &&
[anEvent subtype] == kEventSubtypeTrace) {
mozilla::SignalTracerThread();
return;
}
[super sendEvent:anEvent];
}
- (NSEvent*)nextEventMatchingMask:(NSUInteger)mask
untilDate:(NSDate*)expiration
inMode:(NSString*)mode
dequeue:(BOOL)flag
{
if (expiration) {
mozilla::HangMonitor::Suspend();
}
return [super nextEventMatchingMask:mask
untilDate:expiration inMode:mode dequeue:flag];
}
@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)
, mHadMoreEventsCount(0)
, mRecursionDepth(0)
, mNativeEventCallbackDepth(0)
, mNativeEventScheduledDepth(0)
{
// A Cocoa event loop is running here if (and only if) we've been embedded
// by a Cocoa app (like Camino).
mRunningCocoaEmbedded = [NSApp isRunning] ? true : false;
}
nsAppShell::~nsAppShell()
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
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
}
// 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 Camino is running, or another
// embedding app that uses NSApplicationMain()).
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);
// Get the path of the nib file, which lives in the GRE location
nsCOMPtr<nsIFile> nibFile;
nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(nibFile));
NS_ENSURE_SUCCESS(rv, rv);
nibFile->AppendNative(NS_LITERAL_CSTRING("res"));
nibFile->AppendNative(NS_LITERAL_CSTRING("MainMenu.nib"));
nsAutoCString nibPath;
rv = nibFile->GetNativePath(nibPath);
NS_ENSURE_SUCCESS(rv, rv);
// This call initializes NSApplication unless:
// 1) we're using xre -- NSApp's already been initialized by
// MacApplicationDelegate.mm's EnsureUseCocoaDockAPI().
// 2) Camino is running (or another embedding app that uses
// NSApplicationMain()) -- NSApp's already been initialized and
// its main run loop is already running.
[NSBundle loadNibFile:
[NSString stringWithUTF8String:(const char*)nibPath.get()]
externalNameTable:
[NSDictionary dictionaryWithObject:[GeckoNSApplication sharedApplication]
forKey:@"NSOwner"]
withZone:NSDefaultMallocZone()];
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);
rv = nsBaseAppShell::Init();
#ifndef __LP64__
TextInputHandler::InstallPluginKeyEventsHandler();
#endif
gCocoaAppModalWindowList = new nsCocoaAppModalWindowList;
if (!gAppShellMethodsSwizzled) {
nsToolkit::SwizzleMethods([NSApplication class], @selector(beginModalSessionForWindow:),
@selector(nsAppShell_NSApplication_beginModalSessionForWindow:));
nsToolkit::SwizzleMethods([NSApplication class], @selector(endModalSession:),
@selector(nsAppShell_NSApplication_endModalSession:));
// We should only replace the original terminate: method if we're not
// running in a Cocoa embedder (like Camino). See bug 604901.
if (!mRunningCocoaEmbedded) {
nsToolkit::SwizzleMethods([NSApplication class], @selector(terminate:),
@selector(nsAppShell_NSApplication_terminate:));
}
gAppShellMethodsSwizzled = true;
}
[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;
SAMPLE_LABEL("Events", "ProcessGeckoEvents");
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
// wierdness 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 fix bug 343033 ("5-10 second delay or hang or crash
// when quitting Cocoa Firefox").
[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;
}
// 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.
//
// But (now that we're using [NSRunLoop runMode:beforeDate:]) it's too
// expensive to call ProcessNextNativeEvent() many times in a row (in a
// tight loop), so we never return true more than kHadMoreEventsCountMax
// times in a row. This doesn't seem to cause native event starvation.
//
// 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;
// We don't want any native events to be processed here (via Gecko) while
// Cocoa is displaying an app-modal dialog (as opposed to a window-modal
// "sheet" or a Gecko-modal dialog). Otherwise Cocoa event-processing loops
// may be interrupted, and inappropriate events may get through to the
// browser window(s) underneath. This resolves bmo bugs 419668 and 420967.
//
// But we need more complex handling (we need to make an exception) if a
// Gecko modal dialog is running above the Cocoa app-modal dialog -- for
// which see below.
if ([NSApp _isRunningAppModal] &&
(!gCocoaAppModalWindowList || !gCocoaAppModalWindowList->GeckoModalAboveCocoaModal()))
return false;
bool wasRunningEventLoop = mRunningEventLoop;
mRunningEventLoop = aMayWait;
NSDate* waitUntil = nil;
if (aMayWait)
waitUntil = [NSDate distantFuture];
NSRunLoop* currentRunLoop = [NSRunLoop currentRunLoop];
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 an event is waiting to be processed, run the main event loop
// just long enough to process it. For some reason, using [NSApp
// nextEventMatchingMask:...] to dequeue the event and [NSApp sendEvent:]
// to "send" it causes trouble, so we no longer do that. (The trouble
// was very strange, and only happened while processing Gecko events on
// demand (via ProcessGeckoEvents()), as opposed to processing Gecko
// events in a tight loop (via nsBaseAppShell::Run()): Particularly in
// Camino, mouse-down events sometimes got dropped (or mis-handled), so
// that (for example) you sometimes needed to click more than once on a
// button to make it work (the zoom button was particularly susceptible).
// You also sometimes had to ctrl-click or right-click multiple times to
// bring up a context menu.)
// Now that we're using [NSRunLoop runMode:beforeDate:], it's too
// expensive to call ProcessNextNativeEvent() many times in a row, so we
// never return true more than kHadMoreEventsCountMax in a row. I'm not
// entirely sure why [NSRunLoop runMode:beforeDate:] is too expensive,
// since it and its cousin [NSRunLoop acceptInputForMode:beforeDate:] are
// designed to be called in a tight loop. Possibly the problem is due to
// combining [NSRunLoop runMode:beforeDate] with [NSApp
// nextEventMatchingMask:...].
// We special-case timer events (events of type NSPeriodic) to avoid
// starving them. Apple's documentation is very scanty, and it's now
// more scanty than it used to be. But it appears that [NSRunLoop
// acceptInputForMode:beforeDate:] doesn't process timer events at all,
// that it is called from [NSRunLoop runMode:beforeDate:], and that
// [NSRunLoop runMode:beforeDate:], though it does process timer events,
// doesn't return after doing so. To get around this, when aWait is
// false we check for timer events and process them using [NSApp
// sendEvent:]. When aWait is true [NSRunLoop runMode:beforeDate:]
// will only return on a "real" event. But there's code in
// ProcessGeckoEvents() that should (when need be) wake us up by sending
// a "fake" "real" event. (See Apple's current doc on [NSRunLoop
// runMode:beforeDate:] and a quote from what appears to be an older
// version of this doc at
// http://lists.apple.com/archives/cocoa-dev/2001/May/msg00559.html.)
// If the current mode is something else than NSDefaultRunLoopMode, look
// for events in that mode.
currentMode = [currentRunLoop currentMode];
if (!currentMode)
currentMode = NSDefaultRunLoopMode;
NSEvent* nextEvent = nil;
if (aMayWait) {
mozilla::HangMonitor::Suspend();
}
// If we're running modal (or not in a Gecko "main" event loop) we still
// need to use nextEventMatchingMask and sendEvent -- otherwise (in
// Minefield) the modal window (or non-main event loop) won't receive key
// events or most mouse events.
if ([NSApp _isRunningModal] || !InGeckoMainEventLoop()) {
if ((nextEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:waitUntil
inMode:currentMode
dequeue:YES])) {
// If we're in a Cocoa app-modal session that's been interrupted by a
// Gecko-modal dialog, send the event to the Cocoa app-modal dialog's
// session. This ensures that the app-modal session won't be starved
// of events, and fixes bugs 463473 and 442442. (The case of an
// ordinary Cocoa app-modal dialog has been dealt with above.)
//
// Otherwise (if we're in an ordinary Gecko-modal dialog, or if we're
// otherwise not in a Gecko main event loop), process the event as
// expected.
NSModalSession currentAppModalSession = nil;
if (gCocoaAppModalWindowList)
currentAppModalSession = gCocoaAppModalWindowList->CurrentSession();
mozilla::HangMonitor::NotifyActivity();
if (currentAppModalSession) {
[NSApp _modalSession:currentAppModalSession sendEvent:nextEvent];
} else {
[NSApp sendEvent:nextEvent];
}
eventProcessed = true;
}
} else {
if (aMayWait ||
(nextEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:nil
inMode:currentMode
dequeue:NO])) {
if (nextEvent && ([nextEvent type] == NSPeriodic)) {
nextEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:waitUntil
inMode:currentMode
dequeue:YES];
[NSApp sendEvent:nextEvent];
} else {
[currentRunLoop runMode:currentMode beforeDate:waitUntil];
}
eventProcessed = true;
}
}
} while (mRunningEventLoop);
if (eventProcessed && (mHadMoreEventsCount < kHadMoreEventsCountMax)) {
moreEvents = ([NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:nil
inMode:currentMode
dequeue:NO] != nil);
}
if (moreEvents) {
// Once this reaches kHadMoreEventsCountMax, it will be reset to 0 the
// next time through (whether or not we process any events then).
++mHadMoreEventsCount;
} else {
mHadMoreEventsCount = 0;
}
mRunningEventLoop = wasRunningEventLoop;
NS_OBJC_END_TRY_ABORT_BLOCK;
if (!moreEvents) {
nsChildView::UpdateCurrentInputEventCount();
}
return moreEvents;
}
// Returns true if Gecko events are currently being processed in its "main"
// event loop (or one of its "main" event loops). Returns false if Gecko
// events are being processed in a "nested" event loop, or if we're not
// running in any sort of Gecko event loop. How we process native events in
// ProcessNextNativeEvent() turns on our decision (and if we make the wrong
// choice, the result may be a hang).
//
// We define the "main" event loop(s) as the place (or places) where Gecko
// event processing "normally" takes place, and all other Gecko event loops
// as "nested". The "nested" event loops are normally processed while a call
// from a "main" event loop is on the stack ... but not always. For example,
// the Venkman JavaScript debugger runs a "nested" event loop (in jsdService::
// EnterNestedEventLoop()) whenever it breaks into the current script. But
// if this happens as the result of the user pressing a key combination, there
// won't be any other Gecko event-processing call on the stack (e.g.
// NS_ProcessNextEvent() or NS_ProcessPendingEvents()). (In the current
// nsAppShell implementation, what counts as the "main" event loop is what
// nsBaseAppShell::NativeEventCallback() does to process Gecko events. We
// don't currently use nsBaseAppShell::Run().)
bool
nsAppShell::InGeckoMainEventLoop()
{
if ((gXULModalLevel > 0) || (mRecursionDepth > 0))
return false;
if (mNativeEventCallbackDepth <= 0)
return false;
return true;
}
// 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 calls [NSApp run] on its own (via NSApplicationMain()), and so
// doesn't call nsAppShell::Run().
//
// public
NS_IMETHODIMP
nsAppShell::Run(void)
{
NS_ASSERTION(!mStarted, "nsAppShell::Run() called multiple times");
if (mStarted)
return NS_OK;
mStarted = true;
NS_OBJC_TRY_ABORT([NSApp run]);
return NS_OK;
}
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;
delete gCocoaAppModalWindowList;
gCocoaAppModalWindowList = NULL;
#ifndef __LP64__
TextInputHandler::RemovePluginKeyEventsHandler();
#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,
uint32_t aRecursionDepth)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
mRecursionDepth = aRecursionDepth;
NS_ASSERTION(mAutoreleasePools,
"No stack on which to store autorelease pool");
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
::CFArrayAppendValue(mAutoreleasePools, pool);
return nsBaseAppShell::OnProcessNextEvent(aThread, aMayWait, aRecursionDepth);
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,
uint32_t aRecursionDepth)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
mRecursionDepth = aRecursionDepth;
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, aRecursionDepth);
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;
}
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, nullptr);
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
@end
// We hook beginModalSessionForWindow: and endModalSession: in order to
// maintain a list of Cocoa app-modal windows (and the "sessions" to which
// they correspond). We need this in order to deal with the consequences
// of a Cocoa app-modal dialog being "interrupted" by a Gecko-modal dialog.
// See nsCocoaAppModalWindowList::CurrentSession() and
// nsAppShell::ProcessNextNativeEvent() above.
//
// 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)
- (NSModalSession)nsAppShell_NSApplication_beginModalSessionForWindow:(NSWindow *)aWindow;
- (void)nsAppShell_NSApplication_endModalSession:(NSModalSession)aSession;
- (void)nsAppShell_NSApplication_terminate:(id)sender;
@end
@implementation NSApplication (MethodSwizzling)
// Called if and only if a Cocoa app-modal session is beginning. Always call
// gCocoaAppModalWindowList->PushCocoa() here (if gCocoaAppModalWindowList is
// non-nil).
- (NSModalSession)nsAppShell_NSApplication_beginModalSessionForWindow:(NSWindow *)aWindow
{
NSModalSession session =
[self nsAppShell_NSApplication_beginModalSessionForWindow:aWindow];
if (gCocoaAppModalWindowList)
gCocoaAppModalWindowList->PushCocoa(aWindow, session);
return session;
}
// Called to end any Cocoa modal session (app-modal or otherwise). Only call
// gCocoaAppModalWindowList->PopCocoa() when an app-modal session is ending
// (and when gCocoaAppModalWindowList is non-nil).
- (void)nsAppShell_NSApplication_endModalSession:(NSModalSession)aSession
{
BOOL wasRunningAppModal = [NSApp _isRunningAppModal];
NSWindow *prevAppModalWindow = [NSApp modalWindow];
[self nsAppShell_NSApplication_endModalSession:aSession];
if (gCocoaAppModalWindowList &&
wasRunningAppModal && (prevAppModalWindow != [NSApp modalWindow]))
gCocoaAppModalWindowList->PopCocoa(prevAppModalWindow, aSession);
}
// 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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