The Tor Browser: widget/android/nsAppShell.cpp@b8a032363ba2 (annotated)

widget/android/nsAppShell.cpp@b8a032363ba2 (annotated)

widget/android/nsAppShell.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: c++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 4; -*- */
 /* 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 "nsAppShell.h"
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "mozilla/Hal.h"
 #include "nsIScreen.h"
 #include "nsIScreenManager.h"
 #include "nsWindow.h"
 #include "nsThreadUtils.h"
 #include "nsICommandLineRunner.h"
 #include "nsIObserverService.h"
 #include "nsIAppStartup.h"
 #include "nsIGeolocationProvider.h"
 #include "nsCacheService.h"
 #include "nsIDOMEventListener.h"
 #include "nsIDOMClientRectList.h"
 #include "nsIDOMClientRect.h"
 #include "nsIDOMWakeLockListener.h"
 #include "nsIPowerManagerService.h"
 #include "nsFrameManager.h"
 #include "nsINetworkLinkService.h"
 #include "mozilla/Services.h"
 #include "mozilla/unused.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Hal.h"
 #include "prenv.h"
 #include "AndroidBridge.h"
 #include "AndroidBridgeUtilities.h"
 #include <android/log.h>
 #include <pthread.h>
 #include <wchar.h>
 #include "mozilla/dom/ScreenOrientation.h"
 #include "GeckoProfiler.h"
 #ifdef MOZ_ANDROID_HISTORY
 #include "nsNetUtil.h"
 #include "IHistory.h"
 #endif
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG
 #include "prlog.h"
 #endif
 #ifdef DEBUG_ANDROID_EVENTS
 #define EVLOG(args...)  ALOG(args)
 #else
 #define EVLOG(args...) do { } while (0)
 #endif
 using namespace mozilla;
 #ifdef PR_LOGGING
 PRLogModuleInfo *gWidgetLog = nullptr;
 #endif
 nsIGeolocationUpdate *gLocationCallback = nullptr;
 nsAutoPtr<mozilla::AndroidGeckoEvent> gLastSizeChange;
 nsAppShell *nsAppShell::gAppShell = nullptr;
 NS_IMPL_ISUPPORTS_INHERITED(nsAppShell, nsBaseAppShell, nsIObserver)
 class ThumbnailRunnable : public nsRunnable {
 public:
     ThumbnailRunnable(nsIAndroidBrowserApp* aBrowserApp, int aTabId,
                        const nsTArray<nsIntPoint>& aPoints, RefCountedJavaObject* aBuffer):
         mBrowserApp(aBrowserApp), mPoints(aPoints), mTabId(aTabId), mBuffer(aBuffer) {}
     virtual nsresult Run() {
         jobject buffer = mBuffer->GetObject();
         nsCOMPtr<nsIDOMWindow> domWindow;
         nsCOMPtr<nsIBrowserTab> tab;
         mBrowserApp->GetBrowserTab(mTabId, getter_AddRefs(tab));
         if (!tab) {
             mozilla::widget::android::ThumbnailHelper::SendThumbnail(buffer, mTabId, false);
             return NS_ERROR_FAILURE;
         }
         tab->GetWindow(getter_AddRefs(domWindow));
         if (!domWindow) {
             mozilla::widget::android::ThumbnailHelper::SendThumbnail(buffer, mTabId, false);
             return NS_ERROR_FAILURE;
         }
         NS_ASSERTION(mPoints.Length() == 1, "Thumbnail event does not have enough coordinates");
         nsresult rv = AndroidBridge::Bridge()->CaptureThumbnail(domWindow, mPoints[0].x, mPoints[0].y, mTabId, buffer);
         mozilla::widget::android::ThumbnailHelper::SendThumbnail(buffer, mTabId, NS_SUCCEEDED(rv));
         return rv;
     }
 private:
     nsCOMPtr<nsIAndroidBrowserApp> mBrowserApp;
     nsTArray<nsIntPoint> mPoints;
     int mTabId;
     nsRefPtr<RefCountedJavaObject> mBuffer;
 };
 class WakeLockListener MOZ_FINAL : public nsIDOMMozWakeLockListener {
  public:
   NS_DECL_ISUPPORTS;
   nsresult Callback(const nsAString& topic, const nsAString& state) {
     mozilla::widget::android::GeckoAppShell::NotifyWakeLockChanged(topic, state);
     return NS_OK;
   }
 };
 NS_IMPL_ISUPPORTS(WakeLockListener, nsIDOMMozWakeLockListener)
 nsCOMPtr<nsIPowerManagerService> sPowerManagerService = nullptr;
 StaticRefPtr<WakeLockListener> sWakeLockListener;
 nsAppShell::nsAppShell()
     : mQueueLock("nsAppShell.mQueueLock"),
       mCondLock("nsAppShell.mCondLock"),
       mQueueCond(mCondLock, "nsAppShell.mQueueCond"),
       mQueuedDrawEvent(nullptr),
       mQueuedViewportEvent(nullptr),
       mAllowCoalescingNextDraw(false)
 {
     gAppShell = this;
     if (XRE_GetProcessType() != GeckoProcessType_Default) {
         return;
     }
     sPowerManagerService = do_GetService(POWERMANAGERSERVICE_CONTRACTID);
     if (sPowerManagerService) {
         sWakeLockListener = new WakeLockListener();
     } else {
         NS_WARNING("Failed to retrieve PowerManagerService, wakelocks will be broken!");
     }
 }
 nsAppShell::~nsAppShell()
 {
     gAppShell = nullptr;
     if (sPowerManagerService) {
         sPowerManagerService->RemoveWakeLockListener(sWakeLockListener);
         sPowerManagerService = nullptr;
         sWakeLockListener = nullptr;
     }
 }
 void
 nsAppShell::NotifyNativeEvent()
 {
     MutexAutoLock lock(mCondLock);
     mQueueCond.Notify();
 }
 #define PREFNAME_COALESCE_TOUCHES "dom.event.touch.coalescing.enabled"
 static const char* kObservedPrefs[] = {
   PREFNAME_COALESCE_TOUCHES,
   nullptr
 };
 nsresult
 nsAppShell::Init()
 {
 #ifdef PR_LOGGING
     if (!gWidgetLog)
         gWidgetLog = PR_NewLogModule("Widget");
 #endif
     nsresult rv = nsBaseAppShell::Init();
     nsCOMPtr<nsIObserverService> obsServ =
         mozilla::services::GetObserverService();
     if (obsServ) {
         obsServ->AddObserver(this, "xpcom-shutdown", false);
     }
     if (sPowerManagerService)
         sPowerManagerService->AddWakeLockListener(sWakeLockListener);
     Preferences::AddStrongObservers(this, kObservedPrefs);
     mAllowCoalescingTouches = Preferences::GetBool(PREFNAME_COALESCE_TOUCHES, true);
     return rv;
 }
 NS_IMETHODIMP
 nsAppShell::Observe(nsISupports* aSubject,
                     const char* aTopic,
                     const char16_t* aData)
 {
     if (!strcmp(aTopic, "xpcom-shutdown")) {
         // We need to ensure no observers stick around after XPCOM shuts down
         // or we'll see crashes, as the app shell outlives XPConnect.
         mObserversHash.Clear();
         return nsBaseAppShell::Observe(aSubject, aTopic, aData);
     } else if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) &&
                aData &&
                nsDependentString(aData).Equals(NS_LITERAL_STRING(PREFNAME_COALESCE_TOUCHES))) {
         mAllowCoalescingTouches = Preferences::GetBool(PREFNAME_COALESCE_TOUCHES, true);
         return NS_OK;
     }
     return NS_OK;
 }
 void
 nsAppShell::ScheduleNativeEventCallback()
 {
     EVLOG("nsAppShell::ScheduleNativeEventCallback pth: %p thread: %p main: %d", (void*) pthread_self(), (void*) NS_GetCurrentThread(), NS_IsMainThread());
     // this is valid to be called from any thread, so do so.
     PostEvent(AndroidGeckoEvent::MakeNativePoke());
 }
 bool
 nsAppShell::ProcessNextNativeEvent(bool mayWait)
 {
     EVLOG("nsAppShell::ProcessNextNativeEvent %d", mayWait);
     PROFILER_LABEL("nsAppShell", "ProcessNextNativeEvent");
     nsAutoPtr<AndroidGeckoEvent> curEvent;
     {
         MutexAutoLock lock(mCondLock);
         curEvent = PopNextEvent();
         if (!curEvent && mayWait) {
             PROFILER_LABEL("nsAppShell::ProcessNextNativeEvent", "Wait");
             // hmm, should we really hardcode this 10s?
 #if defined(DEBUG_ANDROID_EVENTS)
             PRTime t0, t1;
             EVLOG("nsAppShell: waiting on mQueueCond");
             t0 = PR_Now();
             mQueueCond.Wait(PR_MillisecondsToInterval(10000));
             t1 = PR_Now();
             EVLOG("nsAppShell: wait done, waited %d ms", (int)(t1-t0)/1000);
 #else
             mQueueCond.Wait();
 #endif
             curEvent = PopNextEvent();
         }
     }
     if (!curEvent)
         return false;
     EVLOG("nsAppShell: event %p %d", (void*)curEvent.get(), curEvent->Type());
     switch (curEvent->Type()) {
     case AndroidGeckoEvent::NATIVE_POKE:
         NativeEventCallback();
         break;
     case AndroidGeckoEvent::SENSOR_EVENT: {
         InfallibleTArray<float> values;
         mozilla::hal::SensorType type = (mozilla::hal::SensorType) curEvent->Flags();
         switch (type) {
           // Bug 938035, transfer HAL data for orientation sensor to meet w3c
           // spec, ex: HAL report alpha=90 means East but alpha=90 means West
           // in w3c spec
           case hal::SENSOR_ORIENTATION:
             values.AppendElement(360 -curEvent->X());
             values.AppendElement(-curEvent->Y());
             values.AppendElement(-curEvent->Z());
             break;
           case hal::SENSOR_LINEAR_ACCELERATION:
           case hal::SENSOR_ACCELERATION:
           case hal::SENSOR_GYROSCOPE:
           case hal::SENSOR_PROXIMITY:
             values.AppendElement(curEvent->X());
             values.AppendElement(curEvent->Y());
             values.AppendElement(curEvent->Z());
             break;
         case hal::SENSOR_LIGHT:
             values.AppendElement(curEvent->X());
             break;
         default:
             __android_log_print(ANDROID_LOG_ERROR,
                                 "Gecko", "### SENSOR_EVENT fired, but type wasn't known %d",
                                 type);
         }
         const hal::SensorAccuracyType &accuracy = (hal::SensorAccuracyType) curEvent->MetaState();
         hal::SensorData sdata(type, PR_Now(), values, accuracy);
         hal::NotifySensorChange(sdata);
       }
       break;
     case AndroidGeckoEvent::LOCATION_EVENT: {
         if (!gLocationCallback)
             break;
         nsGeoPosition* p = curEvent->GeoPosition();
         if (p)
             gLocationCallback->Update(curEvent->GeoPosition());
         else
             NS_WARNING("Received location event without geoposition!");
         break;
     }
     case AndroidGeckoEvent::APP_BACKGROUNDING: {
         nsCOMPtr<nsIObserverService> obsServ =
             mozilla::services::GetObserverService();
         obsServ->NotifyObservers(nullptr, "application-background", nullptr);
         NS_NAMED_LITERAL_STRING(minimize, "heap-minimize");
         obsServ->NotifyObservers(nullptr, "memory-pressure", minimize.get());
         // If we are OOM killed with the disk cache enabled, the entire
         // cache will be cleared (bug 105843), so shut down the cache here
         // and re-init on foregrounding
         if (nsCacheService::GlobalInstance()) {
             nsCacheService::GlobalInstance()->Shutdown();
         }
         // We really want to send a notification like profile-before-change,
         // but profile-before-change ends up shutting some things down instead
         // of flushing data
         nsIPrefService* prefs = Preferences::GetService();
         if (prefs) {
             // reset the crash loop state
             nsCOMPtr<nsIPrefBranch> prefBranch;
             prefs->GetBranch("browser.sessionstore.", getter_AddRefs(prefBranch));
             if (prefBranch)
                 prefBranch->SetIntPref("recent_crashes", 0);
             prefs->SavePrefFile(nullptr);
         }
         break;
     }
     case AndroidGeckoEvent::APP_FOREGROUNDING: {
         // If we are OOM killed with the disk cache enabled, the entire
         // cache will be cleared (bug 105843), so shut down cache on backgrounding
         // and re-init here
         if (nsCacheService::GlobalInstance()) {
             nsCacheService::GlobalInstance()->Init();
         }
         // We didn't return from one of our own activities, so restore
         // to foreground status
         nsCOMPtr<nsIObserverService> obsServ =
             mozilla::services::GetObserverService();
         obsServ->NotifyObservers(nullptr, "application-foreground", nullptr);
         break;
     }
     case AndroidGeckoEvent::THUMBNAIL: {
         if (!mBrowserApp)
             break;
         int32_t tabId = curEvent->MetaState();
         const nsTArray<nsIntPoint>& points = curEvent->Points();
         RefCountedJavaObject* buffer = curEvent->ByteBuffer();
         nsRefPtr<ThumbnailRunnable> sr = new ThumbnailRunnable(mBrowserApp, tabId, points, buffer);
         MessageLoop::current()->PostIdleTask(FROM_HERE, NewRunnableMethod(sr.get(), &ThumbnailRunnable::Run));
         break;
     }
     case AndroidGeckoEvent::VIEWPORT:
     case AndroidGeckoEvent::BROADCAST: {
         if (curEvent->Characters().Length() == 0)
             break;
         nsCOMPtr<nsIObserverService> obsServ =
             mozilla::services::GetObserverService();
         const NS_ConvertUTF16toUTF8 topic(curEvent->Characters());
         const nsPromiseFlatString& data = PromiseFlatString(curEvent->CharactersExtra());
         obsServ->NotifyObservers(nullptr, topic.get(), data.get());
         break;
     }
     case AndroidGeckoEvent::TELEMETRY_UI_SESSION_STOP: {
         if (curEvent->Characters().Length() == 0)
             break;
         nsCOMPtr<nsIUITelemetryObserver> obs;
         mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
         if (!obs)
             break;
         obs->StopSession(
                 nsString(curEvent->Characters()).get(),
                 nsString(curEvent->CharactersExtra()).get(),
                 curEvent->Time()
                 );
         break;
     }
     case AndroidGeckoEvent::TELEMETRY_UI_SESSION_START: {
         if (curEvent->Characters().Length() == 0)
             break;
         nsCOMPtr<nsIUITelemetryObserver> obs;
         mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
         if (!obs)
             break;
         obs->StartSession(
                 nsString(curEvent->Characters()).get(),
                 curEvent->Time()
                 );
         break;
     }
     case AndroidGeckoEvent::TELEMETRY_UI_EVENT: {
         if (curEvent->Data().Length() == 0)
             break;
         nsCOMPtr<nsIUITelemetryObserver> obs;
         mBrowserApp->GetUITelemetryObserver(getter_AddRefs(obs));
         if (!obs)
             break;
         obs->AddEvent(
                 nsString(curEvent->Data()).get(),
                 nsString(curEvent->Characters()).get(),
                 curEvent->Time(),
                 nsString(curEvent->CharactersExtra()).get()
                 );
         break;
     }
     case AndroidGeckoEvent::LOAD_URI: {
         nsCOMPtr<nsICommandLineRunner> cmdline
             (do_CreateInstance("@mozilla.org/toolkit/command-line;1"));
         if (!cmdline)
             break;
         if (curEvent->Characters().Length() == 0)
             break;
         char *uri = ToNewUTF8String(curEvent->Characters());
         if (!uri)
             break;
         char *flag = ToNewUTF8String(curEvent->CharactersExtra());
         const char *argv[4] = {
             "dummyappname",
             "-url",
             uri,
             flag ? flag : ""
         };
         nsresult rv = cmdline->Init(4, argv, nullptr, nsICommandLine::STATE_REMOTE_AUTO);
         if (NS_SUCCEEDED(rv))
             cmdline->Run();
         nsMemory::Free(uri);
         if (flag)
             nsMemory::Free(flag);
         break;
     }
     case AndroidGeckoEvent::SIZE_CHANGED: {
         // store the last resize event to dispatch it to new windows with a FORCED_RESIZE event
         if (curEvent != gLastSizeChange) {
             gLastSizeChange = AndroidGeckoEvent::CopyResizeEvent(curEvent);
         }
         nsWindow::OnGlobalAndroidEvent(curEvent);
         break;
     }
     case AndroidGeckoEvent::VISITED: {
 #ifdef MOZ_ANDROID_HISTORY
         nsCOMPtr<IHistory> history = services::GetHistoryService();
         nsCOMPtr<nsIURI> visitedURI;
         if (history &&
             NS_SUCCEEDED(NS_NewURI(getter_AddRefs(visitedURI),
                                    nsString(curEvent->Characters())))) {
             history->NotifyVisited(visitedURI);
         }
 #endif
         break;
     }
     case AndroidGeckoEvent::NETWORK_CHANGED: {
         hal::NotifyNetworkChange(hal::NetworkInformation(curEvent->ConnectionType(),
                                                          curEvent->IsWifi(),
                                                          curEvent->DHCPGateway()));
         break;
     }
     case AndroidGeckoEvent::SCREENORIENTATION_CHANGED: {
         nsresult rv;
         nsCOMPtr<nsIScreenManager> screenMgr =
             do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
         if (NS_FAILED(rv)) {
             NS_ERROR("Can't find nsIScreenManager!");
             break;
         }
         nsIntRect rect;
         int32_t colorDepth, pixelDepth;
         dom::ScreenOrientation orientation;
         nsCOMPtr<nsIScreen> screen;
         screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
         screen->GetRect(&rect.x, &rect.y, &rect.width, &rect.height);
         screen->GetColorDepth(&colorDepth);
         screen->GetPixelDepth(&pixelDepth);
         orientation =
             static_cast<dom::ScreenOrientation>(curEvent->ScreenOrientation());
         hal::NotifyScreenConfigurationChange(
             hal::ScreenConfiguration(rect, orientation, colorDepth, pixelDepth));
         break;
     }
     case AndroidGeckoEvent::CALL_OBSERVER:
     {
         nsCOMPtr<nsIObserver> observer;
         mObserversHash.Get(curEvent->Characters(), getter_AddRefs(observer));
         if (observer) {
             observer->Observe(nullptr, NS_ConvertUTF16toUTF8(curEvent->CharactersExtra()).get(),
                               nsString(curEvent->Data()).get());
         } else {
             ALOG("Call_Observer event: Observer was not found!");
         }
         break;
     }
     case AndroidGeckoEvent::REMOVE_OBSERVER:
         mObserversHash.Remove(curEvent->Characters());
         break;
     case AndroidGeckoEvent::ADD_OBSERVER:
         AddObserver(curEvent->Characters(), curEvent->Observer());
         break;
     case AndroidGeckoEvent::PREFERENCES_GET:
     case AndroidGeckoEvent::PREFERENCES_OBSERVE: {
         const nsTArray<nsString> &prefNames = curEvent->PrefNames();
         size_t count = prefNames.Length();
         nsAutoArrayPtr<const char16_t*> prefNamePtrs(new const char16_t*[count]);
         for (size_t i = 0; i < count; ++i) {
             prefNamePtrs[i] = prefNames[i].get();
         }
         if (curEvent->Type() == AndroidGeckoEvent::PREFERENCES_GET) {
             mBrowserApp->GetPreferences(curEvent->RequestId(), prefNamePtrs, count);
         } else {
             mBrowserApp->ObservePreferences(curEvent->RequestId(), prefNamePtrs, count);
         }
         break;
     }
     case AndroidGeckoEvent::PREFERENCES_REMOVE_OBSERVERS:
         mBrowserApp->RemovePreferenceObservers(curEvent->RequestId());
         break;
     case AndroidGeckoEvent::LOW_MEMORY:
         // TODO hook in memory-reduction stuff for different levels here
         if (curEvent->MetaState() >= AndroidGeckoEvent::MEMORY_PRESSURE_MEDIUM) {
             nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
             if (os) {
                 os->NotifyObservers(nullptr,
                                     "memory-pressure",
                                     MOZ_UTF16("low-memory"));
             }
         }
         break;
     case AndroidGeckoEvent::NETWORK_LINK_CHANGE:
     {
         nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
         if (os) {
             os->NotifyObservers(nullptr,
                                 NS_NETWORK_LINK_TOPIC,
                                 nsString(curEvent->Characters()).get());
         }
         break;
     }
     case AndroidGeckoEvent::TELEMETRY_HISTOGRAM_ADD:
         Telemetry::Accumulate(NS_ConvertUTF16toUTF8(curEvent->Characters()).get(),
                               curEvent->Count());
         break;
     case AndroidGeckoEvent::NOOP:
         break;
     default:
         nsWindow::OnGlobalAndroidEvent(curEvent);
         break;
     }
     if (curEvent->AckNeeded()) {
         mozilla::widget::android::GeckoAppShell::AcknowledgeEvent();
     }
     EVLOG("nsAppShell: -- done event %p %d", (void*)curEvent.get(), curEvent->Type());
     return true;
 }
 void
 nsAppShell::ResendLastResizeEvent(nsWindow* aDest) {
     if (gLastSizeChange) {
         nsWindow::OnGlobalAndroidEvent(gLastSizeChange);
     }
 }
 AndroidGeckoEvent*
 nsAppShell::PopNextEvent()
 {
     AndroidGeckoEvent *ae = nullptr;
     MutexAutoLock lock(mQueueLock);
     if (mEventQueue.Length()) {
         ae = mEventQueue[0];
         mEventQueue.RemoveElementAt(0);
         if (mQueuedDrawEvent == ae) {
             mQueuedDrawEvent = nullptr;
         } else if (mQueuedViewportEvent == ae) {
             mQueuedViewportEvent = nullptr;
         }
     }
     return ae;
 }
 AndroidGeckoEvent*
 nsAppShell::PeekNextEvent()
 {
     AndroidGeckoEvent *ae = nullptr;
     MutexAutoLock lock(mQueueLock);
     if (mEventQueue.Length()) {
         ae = mEventQueue[0];
     }
     return ae;
 }
 void
 nsAppShell::PostEvent(AndroidGeckoEvent *ae)
 {
     {
         // set this to true when inserting events that we can coalesce
         // viewport events across. this is effectively maintaining a whitelist
         // of events that are unaffected by viewport changes.
         bool allowCoalescingNextViewport = false;
         MutexAutoLock lock(mQueueLock);
         EVLOG("nsAppShell::PostEvent %p %d", ae, ae->Type());
         switch (ae->Type()) {
         case AndroidGeckoEvent::COMPOSITOR_CREATE:
         case AndroidGeckoEvent::COMPOSITOR_PAUSE:
         case AndroidGeckoEvent::COMPOSITOR_RESUME:
             // Give priority to these events, but maintain their order wrt each other.
             {
                 uint32_t i = 0;
                 while (i < mEventQueue.Length() &&
                        (mEventQueue[i]->Type() == AndroidGeckoEvent::COMPOSITOR_CREATE ||
                         mEventQueue[i]->Type() == AndroidGeckoEvent::COMPOSITOR_PAUSE ||
                         mEventQueue[i]->Type() == AndroidGeckoEvent::COMPOSITOR_RESUME)) {
                     i++;
                 }
                 EVLOG("nsAppShell: Inserting compositor event %d at position %d to maintain priority order", ae->Type(), i);
                 mEventQueue.InsertElementAt(i, ae);
             }
             break;
         case AndroidGeckoEvent::DRAW:
             if (mQueuedDrawEvent) {
 #if defined(DEBUG) || defined(FORCE_ALOG)
                 // coalesce this new draw event with the one already in the queue
                 const nsIntRect& oldRect = mQueuedDrawEvent->Rect();
                 const nsIntRect& newRect = ae->Rect();
                 nsIntRect combinedRect = oldRect.Union(newRect);
                 // XXX We may want to consider using regions instead of rectangles.
                 //     Print an error if we're upload a lot more than we would
                 //     if we handled this as two separate events.
                 int combinedArea = (oldRect.width * oldRect.height) +
                                    (newRect.width * newRect.height);
                 int boundsArea = combinedRect.width * combinedRect.height;
                 if (boundsArea > combinedArea * 8)
                     ALOG("nsAppShell: Area of bounds greatly exceeds combined area: %d > %d",
                          boundsArea, combinedArea);
 #endif
                 // coalesce into the new draw event rather than the queued one because
                 // it is not always safe to move draws earlier in the queue; there may
                 // be events between the two draws that affect scroll position or something.
                 ae->UnionRect(mQueuedDrawEvent->Rect());
                 EVLOG("nsAppShell: Coalescing previous DRAW event at %p into new DRAW event %p", mQueuedDrawEvent, ae);
                 mEventQueue.RemoveElement(mQueuedDrawEvent);
                 delete mQueuedDrawEvent;
             }
             if (!mAllowCoalescingNextDraw) {
                 // if we're not allowing coalescing of this draw event, then
                 // don't set mQueuedDrawEvent to point to this; that way the
                 // next draw event that comes in won't kill this one.
                 mAllowCoalescingNextDraw = true;
                 mQueuedDrawEvent = nullptr;
             } else {
                 mQueuedDrawEvent = ae;
             }
             allowCoalescingNextViewport = true;
             mEventQueue.AppendElement(ae);
             break;
         case AndroidGeckoEvent::VIEWPORT:
             if (mQueuedViewportEvent) {
                 // drop the previous viewport event now that we have a new one
                 EVLOG("nsAppShell: Dropping old viewport event at %p in favour of new VIEWPORT event %p", mQueuedViewportEvent, ae);
                 mEventQueue.RemoveElement(mQueuedViewportEvent);
                 delete mQueuedViewportEvent;
             }
             mQueuedViewportEvent = ae;
             // temporarily turn off draw-coalescing, so that we process a draw
             // event as soon as possible after a viewport change
             mAllowCoalescingNextDraw = false;
             allowCoalescingNextViewport = true;
             mEventQueue.AppendElement(ae);
             break;
         case AndroidGeckoEvent::MOTION_EVENT:
             if (ae->Action() == AndroidMotionEvent::ACTION_MOVE && mAllowCoalescingTouches) {
                 int len = mEventQueue.Length();
                 if (len > 0) {
                     AndroidGeckoEvent* event = mEventQueue[len - 1];
                     if (event->Type() == AndroidGeckoEvent::MOTION_EVENT && event->Action() == AndroidMotionEvent::ACTION_MOVE) {
                         // consecutive motion-move events; drop the last one before adding the new one
                         EVLOG("nsAppShell: Dropping old move event at %p in favour of new move event %p", event, ae);
                         mEventQueue.RemoveElementAt(len - 1);
                         delete event;
                     }
                 }
             }
             mEventQueue.AppendElement(ae);
             break;
         case AndroidGeckoEvent::NATIVE_POKE:
             allowCoalescingNextViewport = true;
             // fall through
         default:
             mEventQueue.AppendElement(ae);
             break;
         }
         // if the event wasn't on our whitelist then reset mQueuedViewportEvent
         // so that we don't coalesce future viewport events into the last viewport
         // event we added
         if (!allowCoalescingNextViewport)
             mQueuedViewportEvent = nullptr;
     }
     NotifyNativeEvent();
 }
 void
 nsAppShell::OnResume()
 {
 }
 nsresult
 nsAppShell::AddObserver(const nsAString &aObserverKey, nsIObserver *aObserver)
 {
     NS_ASSERTION(aObserver != nullptr, "nsAppShell::AddObserver: aObserver is null!");
     mObserversHash.Put(aObserverKey, aObserver);
     return NS_OK;
 }
 // Used by IPC code
 namespace mozilla {
 bool ProcessNextEvent()
 {
     return nsAppShell::gAppShell->ProcessNextNativeEvent(true) ? true : false;
 }
 void NotifyEvent()
 {
     nsAppShell::gAppShell->NotifyNativeEvent();
 }
 }

The Tor Browser / annotate

widget/android/nsAppShell.cpp@b8a032363ba2 (annotated)

widget/android/nsAppShell.cpp