Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 2037 insertions, 0 deletions

diff --git a/widget/uikit/GfxInfo.cpp b/widget/uikit/GfxInfo.cpp
new file mode 100644
index 0000000000..d797e4f4a0
--- /dev/null
+++ b/widget/uikit/GfxInfo.cpp
@@ -0,0 +1,174 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "GfxInfo.h"
+#include "nsServiceManagerUtils.h"
+
+namespace mozilla {
+namespace widget {
+
+#ifdef DEBUG
+NS_IMPL_ISUPPORTS_INHERITED(GfxInfo, GfxInfoBase, nsIGfxInfoDebug)
+#endif
+
+GfxInfo::GfxInfo() {}
+
+GfxInfo::~GfxInfo() {}
+
+nsresult GfxInfo::GetD2DEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
+
+nsresult GfxInfo::GetDWriteEnabled(bool* aEnabled) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+GfxInfo::GetDWriteVersion(nsAString& aDwriteVersion) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetCleartypeParameters(nsAString& aCleartypeParams) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDescription(nsAString& aAdapterDescription) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDescription2(nsAString& aAdapterDescription) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterRAM(uint32_t* aAdapterRAM) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterRAM2(uint32_t* aAdapterRAM) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriver(nsAString& aAdapterDriver) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriver2(nsAString& aAdapterDriver) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriverVersion(nsAString& aAdapterDriverVersion) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriverVersion2(nsAString& aAdapterDriverVersion) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriverDate(nsAString& aAdapterDriverDate) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDriverDate2(nsAString& aAdapterDriverDate) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterVendorID(nsAString& aAdapterVendorID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterVendorID2(nsAString& aAdapterVendorID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDeviceID(nsAString& aAdapterDeviceID) {
+  return NS_ERROR_FAILURE;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterDeviceID2(nsAString& aAdapterDeviceID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterSubsysID(nsAString& aAdapterSubsysID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetAdapterSubsysID2(nsAString& aAdapterSubsysID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+GfxInfo::GetIsGPU2Active(bool* aIsGPU2Active) { return NS_ERROR_FAILURE; }
+
+const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
+  if (sDriverInfo->IsEmpty()) {
+    APPEND_TO_DRIVER_BLOCKLIST2(
+        OperatingSystem::Ios, DeviceFamily::All,
+        nsIGfxInfo::FEATURE_OPENGL_LAYERS, nsIGfxInfo::FEATURE_STATUS_OK,
+        DRIVER_COMPARISON_IGNORED, GfxDriverInfo::allDriverVersions);
+  }
+
+  return *sDriverInfo;
+}
+
+nsresult GfxInfo::GetFeatureStatusImpl(
+    int32_t aFeature, int32_t* aStatus, nsAString& aSuggestedDriverVersion,
+    const nsTArray<GfxDriverInfo>& aDriverInfo,
+    OperatingSystem* aOS /* = nullptr */) {
+  NS_ENSURE_ARG_POINTER(aStatus);
+  aSuggestedDriverVersion.SetIsVoid(true);
+  *aStatus = nsIGfxInfo::FEATURE_STATUS_UNKNOWN;
+  if (aOS) *aOS = OperatingSystem::Ios;
+
+  if (sShutdownOccurred) {
+    return NS_OK;
+  }
+
+  // OpenGL layers are never blocklisted on iOS.
+  // This early return is so we avoid potentially slow
+  // GLStrings initialization on startup when we initialize GL layers.
+  if (aFeature == nsIGfxInfo::FEATURE_OPENGL_LAYERS ||
+      aFeature == nsIGfxInfo::FEATURE_WEBGL_OPENGL) {
+    *aStatus = nsIGfxInfo::FEATURE_STATUS_OK;
+    return NS_OK;
+  }
+
+  return GfxInfoBase::GetFeatureStatusImpl(
+      aFeature, aStatus, aSuggestedDriverVersion, aDriverInfo, aOS);
+}
+
+#ifdef DEBUG
+
+// Implement nsIGfxInfoDebug
+
+NS_IMETHODIMP GfxInfo::SpoofVendorID(const nsAString& aVendorID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP GfxInfo::SpoofDeviceID(const nsAString& aDeviceID) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP GfxInfo::SpoofDriverVersion(const nsAString& aDriverVersion) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP GfxInfo::SpoofOSVersion(uint32_t aVersion) {
+  return NS_ERROR_FAILURE;
+}
+
+#endif
+
+}  // namespace widget
+}  // namespace mozilla
diff --git a/widget/uikit/GfxInfo.h b/widget/uikit/GfxInfo.h
new file mode 100644
index 0000000000..fe75e28d23
--- /dev/null
+++ b/widget/uikit/GfxInfo.h
@@ -0,0 +1,75 @@
+/* vim: se cin sw=2 ts=2 et : */
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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/. */
+
+#ifndef __mozilla_widget_GfxInfo_h__
+#define __mozilla_widget_GfxInfo_h__
+
+#include "GfxInfoBase.h"
+#include "GfxDriverInfo.h"
+
+#include "nsString.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+
+namespace gl {
+class GLContext;
+}
+
+namespace widget {
+
+class GfxInfo : public GfxInfoBase {
+ private:
+  ~GfxInfo();
+
+ public:
+  GfxInfo();
+
+  // We only declare the subset of nsIGfxInfo that we actually implement. The
+  // rest is brought forward from GfxInfoBase.
+  NS_IMETHOD GetD2DEnabled(bool* aD2DEnabled) override;
+  NS_IMETHOD GetDWriteEnabled(bool* aDWriteEnabled) override;
+  NS_IMETHOD GetDWriteVersion(nsAString& aDwriteVersion) override;
+  NS_IMETHOD GetCleartypeParameters(nsAString& aCleartypeParams) override;
+  NS_IMETHOD GetAdapterDescription(nsAString& aAdapterDescription) override;
+  NS_IMETHOD GetAdapterDriver(nsAString& aAdapterDriver) override;
+  NS_IMETHOD GetAdapterVendorID(nsAString& aAdapterVendorID) override;
+  NS_IMETHOD GetAdapterDeviceID(nsAString& aAdapterDeviceID) override;
+  NS_IMETHOD GetAdapterSubsysID(nsAString& aAdapterSubsysID) override;
+  NS_IMETHOD GetAdapterRAM(uint32_t* aAdapterRAM) override;
+  NS_IMETHOD GetAdapterDriverVersion(nsAString& aAdapterDriverVersion) override;
+  NS_IMETHOD GetAdapterDriverDate(nsAString& aAdapterDriverDate) override;
+  NS_IMETHOD GetAdapterDescription2(nsAString& aAdapterDescription) override;
+  NS_IMETHOD GetAdapterDriver2(nsAString& aAdapterDriver) override;
+  NS_IMETHOD GetAdapterVendorID2(nsAString& aAdapterVendorID) override;
+  NS_IMETHOD GetAdapterDeviceID2(nsAString& aAdapterDeviceID) override;
+  NS_IMETHOD GetAdapterSubsysID2(nsAString& aAdapterSubsysID) override;
+  NS_IMETHOD GetAdapterRAM2(uint32_t* aAdapterRAM) override;
+  NS_IMETHOD GetAdapterDriverVersion2(
+      nsAString& aAdapterDriverVersion) override;
+  NS_IMETHOD GetAdapterDriverDate2(nsAString& aAdapterDriverDate) override;
+  NS_IMETHOD GetIsGPU2Active(bool* aIsGPU2Active) override;
+  using GfxInfoBase::GetFeatureStatus;
+  using GfxInfoBase::GetFeatureSuggestedDriverVersion;
+
+#ifdef DEBUG
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIGFXINFODEBUG
+#endif
+
+ protected:
+  virtual nsresult GetFeatureStatusImpl(
+      int32_t aFeature, int32_t* aStatus, nsAString& aSuggestedDriverVersion,
+      const nsTArray<GfxDriverInfo>& aDriverInfo,
+      OperatingSystem* aOS = nullptr);
+  virtual const nsTArray<GfxDriverInfo>& GetGfxDriverInfo();
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif /* __mozilla_widget_GfxInfo_h__ */
diff --git a/widget/uikit/moz.build b/widget/uikit/moz.build
new file mode 100644
index 0000000000..6a3c2db994
--- /dev/null
+++ b/widget/uikit/moz.build
@@ -0,0 +1,24 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Core", "Widget")
+
+SOURCES += [
+    "GfxInfo.cpp",
+    "nsAppShell.mm",
+    "nsLookAndFeel.mm",
+    "nsScreenManager.mm",
+    "nsWidgetFactory.mm",
+    "nsWindow.mm",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+LOCAL_INCLUDES += [
+    "/widget",
+]
diff --git a/widget/uikit/nsAppShell.h b/widget/uikit/nsAppShell.h
new file mode 100644
index 0000000000..fd46a51025
--- /dev/null
+++ b/widget/uikit/nsAppShell.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 UIKit run loop, interrupting it as needed to process
+ * Gecko events.
+ */
+
+#ifndef nsAppShell_h_
+#define nsAppShell_h_
+
+#include "nsBaseAppShell.h"
+#include "nsTArray.h"
+
+#include <Foundation/NSAutoreleasePool.h>
+#include <CoreFoundation/CFRunLoop.h>
+#include <UIKit/UIWindow.h>
+
+@class AppShellDelegate;
+
+class nsAppShell : public nsBaseAppShell {
+ public:
+  NS_IMETHOD ResumeNative(void) override;
+
+  nsAppShell();
+
+  nsresult Init();
+
+  NS_IMETHOD Run(void) override;
+  NS_IMETHOD Exit(void) override;
+  // Called by the application delegate
+  void WillTerminate(void);
+
+  static nsAppShell* gAppShell;
+  static UIWindow* gWindow;
+  static NSMutableArray* gTopLevelViews;
+
+ protected:
+  virtual ~nsAppShell();
+
+  static void ProcessGeckoEvents(void* aInfo);
+  virtual void ScheduleNativeEventCallback();
+  virtual bool ProcessNextNativeEvent(bool aMayWait);
+
+  NSAutoreleasePool* mAutoreleasePool;
+  AppShellDelegate* mDelegate;
+  CFRunLoopRef mCFRunLoop;
+  CFRunLoopSourceRef mCFRunLoopSource;
+
+  bool mTerminated;
+  bool mNotifiedWillTerminate;
+};
+
+#endif  // nsAppShell_h_
diff --git a/widget/uikit/nsAppShell.mm b/widget/uikit/nsAppShell.mm
new file mode 100644
index 0000000000..1fd995f3e8
--- /dev/null
+++ b/widget/uikit/nsAppShell.mm
@@ -0,0 +1,241 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#import <UIKit/UIApplication.h>
+#import <UIKit/UIScreen.h>
+#import <UIKit/UIWindow.h>
+#import <UIKit/UIViewController.h>
+
+#include "nsAppShell.h"
+#include "nsCOMPtr.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsString.h"
+#include "nsIRollupListener.h"
+#include "nsIWidget.h"
+#include "nsThreadUtils.h"
+#include "nsMemoryPressure.h"
+#include "nsServiceManagerUtils.h"
+
+nsAppShell* nsAppShell::gAppShell = NULL;
+UIWindow* nsAppShell::gWindow = nil;
+NSMutableArray* nsAppShell::gTopLevelViews = [[NSMutableArray alloc] init];
+
+#define ALOG(args...)    \
+  fprintf(stderr, args); \
+  fprintf(stderr, "\n")
+
+// ViewController
+@interface ViewController : UIViewController
+@end
+
+@implementation ViewController
+
+- (void)loadView {
+  ALOG("[ViewController loadView]");
+  CGRect r = {{0, 0}, {100, 100}};
+  self.view = [[UIView alloc] initWithFrame:r];
+  [self.view setBackgroundColor:[UIColor lightGrayColor]];
+  // add all of the top level views as children
+  for (UIView* v in nsAppShell::gTopLevelViews) {
+    ALOG("[ViewController.view addSubView:%p]", v);
+    [self.view addSubview:v];
+  }
+  [nsAppShell::gTopLevelViews release];
+  nsAppShell::gTopLevelViews = nil;
+}
+@end
+
+// AppShellDelegate
+//
+// Acts as a delegate for the UIApplication
+
+@interface AppShellDelegate : NSObject <UIApplicationDelegate> {
+}
+@property(strong, nonatomic) UIWindow* window;
+@end
+
+@implementation AppShellDelegate
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  ALOG("[AppShellDelegate application:didFinishLaunchingWithOptions:]");
+  // We only create one window, since we can only display one window at
+  // a time anyway. Also, iOS 4 fails to display UIWindows if you
+  // create them before calling UIApplicationMain, so this makes more sense.
+  nsAppShell::gWindow =
+      [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] retain];
+  self.window = nsAppShell::gWindow;
+
+  self.window.rootViewController = [[ViewController alloc] init];
+
+  // just to make things more visible for now
+  nsAppShell::gWindow.backgroundColor = [UIColor blueColor];
+  [nsAppShell::gWindow makeKeyAndVisible];
+
+  return YES;
+}
+
+- (void)applicationWillTerminate:(UIApplication*)application {
+  ALOG("[AppShellDelegate applicationWillTerminate:]");
+  nsAppShell::gAppShell->WillTerminate();
+}
+
+- (void)applicationDidBecomeActive:(UIApplication*)application {
+  ALOG("[AppShellDelegate applicationDidBecomeActive:]");
+}
+
+- (void)applicationWillResignActive:(UIApplication*)application {
+  ALOG("[AppShellDelegate applicationWillResignActive:]");
+}
+
+- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application {
+  ALOG("[AppShellDelegate applicationDidReceiveMemoryWarning:]");
+  NS_NotifyOfMemoryPressure(MemoryPressureState::LowMemory);
+}
+@end
+
+// nsAppShell implementation
+
+NS_IMETHODIMP
+nsAppShell::ResumeNative(void) { return nsBaseAppShell::ResumeNative(); }
+
+nsAppShell::nsAppShell()
+    : mAutoreleasePool(NULL),
+      mDelegate(NULL),
+      mCFRunLoop(NULL),
+      mCFRunLoopSource(NULL),
+      mTerminated(false),
+      mNotifiedWillTerminate(false) {
+  gAppShell = this;
+}
+
+nsAppShell::~nsAppShell() {
+  if (mAutoreleasePool) {
+    [mAutoreleasePool release];
+    mAutoreleasePool = NULL;
+  }
+
+  if (mCFRunLoop) {
+    if (mCFRunLoopSource) {
+      ::CFRunLoopRemoveSource(mCFRunLoop, mCFRunLoopSource, kCFRunLoopCommonModes);
+      ::CFRelease(mCFRunLoopSource);
+    }
+    ::CFRelease(mCFRunLoop);
+  }
+
+  gAppShell = NULL;
+}
+
+// Init
+//
+// public
+nsresult nsAppShell::Init() {
+  mAutoreleasePool = [[NSAutoreleasePool alloc] init];
+
+  // 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);
+
+  return nsBaseAppShell::Init();
+}
+
+// ProcessGeckoEvents
+//
+// The "perform" target of mCFRunLoop, called when mCFRunLoopSource is
+// signalled from ScheduleNativeEventCallback.
+//
+// protected static
+void nsAppShell::ProcessGeckoEvents(void* aInfo) {
+  nsAppShell* self = static_cast<nsAppShell*>(aInfo);
+  self->NativeEventCallback();
+  self->Release();
+}
+
+// WillTerminate
+//
+// public
+void nsAppShell::WillTerminate() {
+  mNotifiedWillTerminate = true;
+  if (mTerminated) return;
+  mTerminated = true;
+  // We won't get another chance to process events
+  NS_ProcessPendingEvents(NS_GetCurrentThread());
+
+  // Unless we call nsBaseAppShell::Exit() here, it might not get called
+  // at all.
+  nsBaseAppShell::Exit();
+}
+
+// ScheduleNativeEventCallback
+//
+// protected virtual
+void nsAppShell::ScheduleNativeEventCallback() {
+  if (mTerminated) return;
+
+  NS_ADDREF_THIS();
+
+  // This will invoke ProcessGeckoEvents on the main thread.
+  ::CFRunLoopSourceSignal(mCFRunLoopSource);
+  ::CFRunLoopWakeUp(mCFRunLoop);
+}
+
+// ProcessNextNativeEvent
+//
+// protected virtual
+bool nsAppShell::ProcessNextNativeEvent(bool aMayWait) {
+  if (mTerminated) return false;
+
+  NSString* currentMode = nil;
+  NSDate* waitUntil = nil;
+  if (aMayWait) waitUntil = [NSDate distantFuture];
+  NSRunLoop* currentRunLoop = [NSRunLoop currentRunLoop];
+
+  BOOL eventProcessed = NO;
+  do {
+    currentMode = [currentRunLoop currentMode];
+    if (!currentMode) currentMode = NSDefaultRunLoopMode;
+
+    if (aMayWait)
+      eventProcessed = [currentRunLoop runMode:currentMode beforeDate:waitUntil];
+    else
+      [currentRunLoop acceptInputForMode:currentMode beforeDate:waitUntil];
+  } while (eventProcessed && aMayWait);
+
+  return false;
+}
+
+// Run
+//
+// public
+NS_IMETHODIMP
+nsAppShell::Run(void) {
+  ALOG("nsAppShell::Run");
+  char argv[1][4] = {"app"};
+  UIApplicationMain(1, (char**)argv, nil, @"AppShellDelegate");
+  // UIApplicationMain doesn't exit. :-(
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAppShell::Exit(void) {
+  if (mTerminated) return NS_OK;
+
+  mTerminated = true;
+  return nsBaseAppShell::Exit();
+}
diff --git a/widget/uikit/nsLookAndFeel.h b/widget/uikit/nsLookAndFeel.h
new file mode 100644
index 0000000000..7de7e0712b
--- /dev/null
+++ b/widget/uikit/nsLookAndFeel.h
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef __nsLookAndFeel
+#define __nsLookAndFeel
+
+#include "nsXPLookAndFeel.h"
+
+class nsLookAndFeel final : public nsXPLookAndFeel {
+ public:
+  nsLookAndFeel();
+  virtual ~nsLookAndFeel();
+
+  void NativeInit() final;
+  virtual void RefreshImpl();
+  nsresult NativeGetImpl(IntID aID, int32_t& aResult) override;
+  nsresult NativeGetFloat(FloatID aID, float& aResult) override;
+  nsresult NativeGetColor(ColorID, ColorScheme, nscolor& aResult) override;
+  bool NativeGetFont(FontID aID, nsString& aFontName,
+                     gfxFontStyle& aFontStyle) override;
+  virtual char16_t GetPasswordCharacterImpl() {
+    // unicode value for the bullet character, used for password textfields.
+    return 0x2022;
+  }
+
+  static bool UseOverlayScrollbars() { return true; }
+
+ private:
+  nscolor mColorTextSelectForeground;
+  nscolor mColorDarkText;
+
+  bool mInitialized;
+
+  void EnsureInit();
+};
+
+#endif
diff --git a/widget/uikit/nsLookAndFeel.mm b/widget/uikit/nsLookAndFeel.mm
new file mode 100644
index 0000000000..5758f93142
--- /dev/null
+++ b/widget/uikit/nsLookAndFeel.mm
@@ -0,0 +1,383 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#import <UIKit/UIColor.h>
+#import <UIKit/UIInterface.h>
+
+#include "nsLookAndFeel.h"
+
+#include "mozilla/FontPropertyTypes.h"
+#include "nsStyleConsts.h"
+#include "gfxFont.h"
+#include "gfxFontConstants.h"
+
+nsLookAndFeel::nsLookAndFeel() : mInitialized(false) {}
+
+nsLookAndFeel::~nsLookAndFeel() {}
+
+static nscolor GetColorFromUIColor(UIColor* aColor) {
+  CGColorRef cgColor = [aColor CGColor];
+  CGColorSpaceModel model = CGColorSpaceGetModel(CGColorGetColorSpace(cgColor));
+  const CGFloat* components = CGColorGetComponents(cgColor);
+  if (model == kCGColorSpaceModelRGB) {
+    return NS_RGB((unsigned int)(components[0] * 255.0), (unsigned int)(components[1] * 255.0),
+                  (unsigned int)(components[2] * 255.0));
+  } else if (model == kCGColorSpaceModelMonochrome) {
+    unsigned int val = (unsigned int)(components[0] * 255.0);
+    return NS_RGBA(val, val, val, (unsigned int)(components[1] * 255.0));
+  }
+  MOZ_ASSERT_UNREACHABLE("Unhandled color space!");
+  return 0;
+}
+
+void nsLookAndFeel::NativeInit() { EnsureInit(); }
+
+void nsLookAndFeel::RefreshImpl() {
+  nsXPLookAndFeel::RefreshImpl();
+
+  mInitialized = false;
+}
+
+nsresult nsLookAndFeel::NativeGetColor(ColorID, ColorScheme, nscolor& aResult) {
+  EnsureInit();
+
+  nsresult res = NS_OK;
+
+  switch (aID) {
+    case ColorID::Highlight:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozMenuhover:
+      aResult = NS_RGB(0xee, 0xee, 0xee);
+      break;
+    case ColorID::Highlighttext:
+    case ColorID::MozMenuhovertext:
+      aResult = mColorTextSelectForeground;
+      break;
+    case ColorID::IMESelectedRawTextBackground:
+    case ColorID::IMESelectedConvertedTextBackground:
+    case ColorID::IMERawInputBackground:
+    case ColorID::IMEConvertedTextBackground:
+      aResult = NS_TRANSPARENT;
+      break;
+    case ColorID::IMESelectedRawTextForeground:
+    case ColorID::IMESelectedConvertedTextForeground:
+    case ColorID::IMERawInputForeground:
+    case ColorID::IMEConvertedTextForeground:
+      aResult = NS_SAME_AS_FOREGROUND_COLOR;
+      break;
+    case ColorID::IMERawInputUnderline:
+    case ColorID::IMEConvertedTextUnderline:
+      aResult = NS_40PERCENT_FOREGROUND_COLOR;
+      break;
+    case ColorID::IMESelectedRawTextUnderline:
+    case ColorID::IMESelectedConvertedTextUnderline:
+      aResult = NS_SAME_AS_FOREGROUND_COLOR;
+      break;
+    case ColorID::SpellCheckerUnderline:
+      aResult = NS_RGB(0xff, 0, 0);
+      break;
+
+    //
+    // css2 system colors http://www.w3.org/TR/REC-CSS2/ui.html#system-colors
+    //
+    case ColorID::Buttontext:
+    case ColorID::MozButtonhovertext:
+    case ColorID::Captiontext:
+    case ColorID::Menutext:
+    case ColorID::Infotext:
+    case ColorID::MozMenubartext:
+    case ColorID::Windowtext:
+      aResult = mColorDarkText;
+      break;
+    case ColorID::Activecaption:
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::Activeborder:
+      aResult = NS_RGB(0x00, 0x00, 0x00);
+      break;
+    case ColorID::Appworkspace:
+      aResult = NS_RGB(0xFF, 0xFF, 0xFF);
+      break;
+    case ColorID::Background:
+      aResult = NS_RGB(0x63, 0x63, 0xCE);
+      break;
+    case ColorID::Buttonface:
+    case ColorID::MozButtonhoverface:
+      aResult = NS_RGB(0xF0, 0xF0, 0xF0);
+      break;
+    case ColorID::Buttonhighlight:
+      aResult = NS_RGB(0xFF, 0xFF, 0xFF);
+      break;
+    case ColorID::Buttonshadow:
+      aResult = NS_RGB(0xDC, 0xDC, 0xDC);
+      break;
+    case ColorID::Graytext:
+      aResult = NS_RGB(0x44, 0x44, 0x44);
+      break;
+    case ColorID::Inactiveborder:
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::Inactivecaption:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::Inactivecaptiontext:
+      aResult = NS_RGB(0x45, 0x45, 0x45);
+      break;
+    case ColorID::Scrollbar:
+      aResult = NS_RGB(0, 0, 0);  // XXX
+      break;
+    case ColorID::Threeddarkshadow:
+      aResult = NS_RGB(0xDC, 0xDC, 0xDC);
+      break;
+    case ColorID::Threedshadow:
+      aResult = NS_RGB(0xE0, 0xE0, 0xE0);
+      break;
+    case ColorID::Threedface:
+      aResult = NS_RGB(0xF0, 0xF0, 0xF0);
+      break;
+    case ColorID::Threedhighlight:
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::Threedlightshadow:
+      aResult = NS_RGB(0xDA, 0xDA, 0xDA);
+      break;
+    case ColorID::Menu:
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::Infobackground:
+      aResult = NS_RGB(0xFF, 0xFF, 0xC7);
+      break;
+    case ColorID::Windowframe:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::Window:
+    case ColorID::MozField:
+    case ColorID::MozCombobox:
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::MozFieldtext:
+    case ColorID::MozComboboxtext:
+      aResult = mColorDarkText;
+      break;
+    case ColorID::MozDialog:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozDialogtext:
+    case ColorID::MozCellhighlighttext:
+    case ColorID::Selecteditemtext:
+    case ColorID::MozColheadertext:
+    case ColorID::MozColheaderhovertext:
+      aResult = mColorDarkText;
+      break;
+    case ColorID::MozDragtargetzone:
+    case ColorID::MozMacChromeActive:
+    case ColorID::MozMacChromeInactive:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozMacFocusring:
+      aResult = NS_RGB(0x3F, 0x98, 0xDD);
+      break;
+    case ColorID::MozMacMenushadow:
+      aResult = NS_RGB(0xA3, 0xA3, 0xA3);
+      break;
+    case ColorID::MozMacMenutextdisable:
+      aResult = NS_RGB(0x88, 0x88, 0x88);
+      break;
+    case ColorID::MozMacMenutextselect:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozMacDisabledtoolbartext:
+      aResult = NS_RGB(0x3F, 0x3F, 0x3F);
+      break;
+    case ColorID::MozMacMenuselect:
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozButtondefault:
+      aResult = NS_RGB(0xDC, 0xDC, 0xDC);
+      break;
+    case ColorID::MozCellhighlight:
+    case ColorID::Selecteditem:
+    case ColorID::MozMacSecondaryhighlight:
+      // For inactive list selection
+      aResult = NS_RGB(0xaa, 0xaa, 0xaa);
+      break;
+    case ColorID::MozEventreerow:
+      // Background color of even list rows.
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      break;
+    case ColorID::MozOddtreerow:
+      // Background color of odd list rows.
+      aResult = NS_TRANSPARENT;
+      break;
+    case ColorID::MozNativehyperlinktext:
+      // There appears to be no available system defined color. HARDCODING to the appropriate color.
+      aResult = NS_RGB(0x14, 0x4F, 0xAE);
+      break;
+    case ColorID::MozNativevisitedhyperlinktext:
+      // Safari defaults to the MacOS color implementation for visited links, which in turn uses
+      // systemPurpleColor, so we do the same here.
+      aResult = GetColorFromUIColor([UIColor systemPurpleColor]);
+      break;
+    default:
+      NS_WARNING("Someone asked nsILookAndFeel for a color I don't know about");
+      aResult = NS_RGB(0xff, 0xff, 0xff);
+      res = NS_ERROR_FAILURE;
+      break;
+  }
+
+  return res;
+}
+
+NS_IMETHODIMP
+nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
+  nsresult res = NS_OK;
+
+  switch (aID) {
+    case IntID::ScrollButtonLeftMouseButtonAction:
+      aResult = 0;
+      break;
+    case IntID::ScrollButtonMiddleMouseButtonAction:
+    case IntID::ScrollButtonRightMouseButtonAction:
+      aResult = 3;
+      break;
+    case IntID::CaretBlinkTime:
+      aResult = 567;
+      break;
+    case IntID::CaretWidth:
+      aResult = 1;
+      break;
+    case IntID::ShowCaretDuringSelection:
+      aResult = 0;
+      break;
+    case IntID::SelectTextfieldsOnKeyFocus:
+      // Select textfield content when focused by kbd
+      // used by nsEventStateManager::sTextfieldSelectModel
+      aResult = 1;
+      break;
+    case IntID::SubmenuDelay:
+      aResult = 200;
+      break;
+    case IntID::MenusCanOverlapOSBar:
+      // xul popups are not allowed to overlap the menubar.
+      aResult = 0;
+      break;
+    case IntID::SkipNavigatingDisabledMenuItem:
+      aResult = 1;
+      break;
+    case IntID::DragThresholdX:
+    case IntID::DragThresholdY:
+      aResult = 4;
+      break;
+    case IntID::ScrollArrowStyle:
+      aResult = eScrollArrow_None;
+      break;
+    case IntID::TreeOpenDelay:
+      aResult = 1000;
+      break;
+    case IntID::TreeCloseDelay:
+      aResult = 1000;
+      break;
+    case IntID::TreeLazyScrollDelay:
+      aResult = 150;
+      break;
+    case IntID::TreeScrollDelay:
+      aResult = 100;
+      break;
+    case IntID::TreeScrollLinesMax:
+      aResult = 3;
+      break;
+    case IntID::DWMCompositor:
+    case IntID::WindowsClassic:
+    case IntID::WindowsDefaultTheme:
+      aResult = 0;
+      res = NS_ERROR_NOT_IMPLEMENTED;
+      break;
+    case IntID::MacGraphiteTheme:
+      aResult = 0;
+      break;
+    case IntID::TabFocusModel:
+      aResult = 1;  // default to just textboxes
+      break;
+    case IntID::ScrollToClick:
+      aResult = 0;
+      break;
+    case IntID::ChosenMenuItemsShouldBlink:
+      aResult = 1;
+      break;
+    case IntID::IMERawInputUnderlineStyle:
+    case IntID::IMEConvertedTextUnderlineStyle:
+    case IntID::IMESelectedRawTextUnderlineStyle:
+    case IntID::IMESelectedConvertedTextUnderline:
+      aResult = static_cast<int32_t>(StyleTextDecorationStyle::Solid);
+      break;
+    case IntID::SpellCheckerUnderlineStyle:
+      aResult = static_cast<int32_t>(StyleTextDecorationStyle::Dotted);
+      break;
+    case IntID::ContextMenuOffsetVertical:
+    case IntID::ContextMenuOffsetHorizontal:
+      aResult = 2;
+      break;
+    default:
+      aResult = 0;
+      res = NS_ERROR_FAILURE;
+  }
+  return res;
+}
+
+NS_IMETHODIMP
+nsLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
+  nsresult res = NS_OK;
+
+  switch (aID) {
+    case FloatID::IMEUnderlineRelativeSize:
+      aResult = 2.0f;
+      break;
+    case FloatID::SpellCheckerUnderlineRelativeSize:
+      aResult = 2.0f;
+      break;
+    default:
+      aResult = -1.0;
+      res = NS_ERROR_FAILURE;
+  }
+
+  return res;
+}
+
+bool nsLookAndFeel::NativeGetFont(FontID aID, nsString& aFontName, gfxFontStyle& aFontStyle) {
+  // hack for now
+  if (aID == FontID::Window || aID == FontID::Document) {
+    aFontStyle.style = FontSlantStyle::Normal();
+    aFontStyle.weight = FontWeight::Normal();
+    aFontStyle.stretch = FontStretch::Normal();
+    aFontStyle.size = 14;
+    aFontStyle.systemFont = true;
+
+    aFontName.AssignLiteral("sans-serif");
+    return true;
+  }
+
+  // TODO: implement more here?
+  return false;
+}
+
+void nsLookAndFeel::EnsureInit() {
+  if (mInitialized) {
+    return;
+  }
+  mInitialized = true;
+
+  nscolor color;
+  GetColor(ColorID::TextSelectBackground, color);
+  if (color == 0x000000) {
+    mColorTextSelectForeground = NS_RGB(0xff, 0xff, 0xff);
+  } else {
+    mColorTextSelectForeground = NS_SAME_AS_FOREGROUND_COLOR;
+  }
+
+  mColorDarkText = GetColorFromUIColor([UIColor darkTextColor]);
+
+  RecordTelemetry();
+}
diff --git a/widget/uikit/nsScreenManager.h b/widget/uikit/nsScreenManager.h
new file mode 100644
index 0000000000..db4d7ed8e9
--- /dev/null
+++ b/widget/uikit/nsScreenManager.h
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef nsScreenManager_h_
+#define nsScreenManager_h_
+
+#include "nsBaseScreen.h"
+#include "nsIScreenManager.h"
+#include "nsCOMPtr.h"
+#include "nsRect.h"
+
+@class UIScreen;
+
+class UIKitScreen : public nsBaseScreen {
+ public:
+  explicit UIKitScreen(UIScreen* screen);
+  ~UIKitScreen() {}
+
+  NS_IMETHOD GetId(uint32_t* outId) override {
+    *outId = 0;
+    return NS_OK;
+  }
+
+  NS_IMETHOD GetRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth, int32_t* aHeight) override;
+  NS_IMETHOD GetAvailRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
+                          int32_t* aHeight) override;
+  NS_IMETHOD GetRectDisplayPix(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
+                               int32_t* aHeight) override;
+  NS_IMETHOD GetAvailRectDisplayPix(int32_t* aLeft, int32_t* aTop, int32_t* aWidth,
+                                    int32_t* aHeight) override;
+  NS_IMETHOD GetPixelDepth(int32_t* aPixelDepth) override;
+  NS_IMETHOD GetColorDepth(int32_t* aColorDepth) override;
+  NS_IMETHOD GetContentsScaleFactor(double* aContentsScaleFactor) override;
+  NS_IMETHOD GetDefaultCSSScaleFactor(double* aScaleFactor) override {
+    return GetContentsScaleFactor(aScaleFactor);
+  }
+
+ private:
+  UIScreen* mScreen;
+};
+
+class UIKitScreenManager : public nsIScreenManager {
+ public:
+  UIKitScreenManager();
+
+  NS_DECL_ISUPPORTS
+
+  NS_DECL_NSISCREENMANAGER
+
+  static LayoutDeviceIntRect GetBounds();
+
+ private:
+  virtual ~UIKitScreenManager() {}
+  // TODO: support >1 screen, iPad supports external displays
+  nsCOMPtr<nsIScreen> mScreen;
+};
+
+#endif  // nsScreenManager_h_
diff --git a/widget/uikit/nsScreenManager.mm b/widget/uikit/nsScreenManager.mm
new file mode 100644
index 0000000000..a9ed0f3d66
--- /dev/null
+++ b/widget/uikit/nsScreenManager.mm
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#import <UIKit/UIScreen.h>
+
+#include "gfxPoint.h"
+#include "nsScreenManager.h"
+#include "nsAppShell.h"
+
+static LayoutDeviceIntRect gScreenBounds;
+static bool gScreenBoundsSet = false;
+
+UIKitScreen::UIKitScreen(UIScreen* aScreen) { mScreen = [aScreen retain]; }
+
+NS_IMETHODIMP
+UIKitScreen::GetRect(int32_t* outX, int32_t* outY, int32_t* outWidth, int32_t* outHeight) {
+  return GetRectDisplayPix(outX, outY, outWidth, outHeight);
+}
+
+NS_IMETHODIMP
+UIKitScreen::GetAvailRect(int32_t* outX, int32_t* outY, int32_t* outWidth, int32_t* outHeight) {
+  return GetAvailRectDisplayPix(outX, outY, outWidth, outHeight);
+}
+
+NS_IMETHODIMP
+UIKitScreen::GetRectDisplayPix(int32_t* outX, int32_t* outY, int32_t* outWidth,
+                               int32_t* outHeight) {
+  nsIntRect rect = UIKitScreenManager::GetBounds();
+  *outX = rect.x;
+  *outY = rect.y;
+  *outWidth = rect.width;
+  *outHeight = rect.height;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UIKitScreen::GetAvailRectDisplayPix(int32_t* outX, int32_t* outY, int32_t* outWidth,
+                                    int32_t* outHeight) {
+  CGRect rect = [mScreen applicationFrame];
+  CGFloat scale = [mScreen scale];
+
+  *outX = rect.origin.x * scale;
+  *outY = rect.origin.y * scale;
+  *outWidth = rect.size.width * scale;
+  *outHeight = rect.size.height * scale;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UIKitScreen::GetPixelDepth(int32_t* aPixelDepth) {
+  // Close enough.
+  *aPixelDepth = 24;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UIKitScreen::GetColorDepth(int32_t* aColorDepth) { return GetPixelDepth(aColorDepth); }
+
+NS_IMETHODIMP
+UIKitScreen::GetContentsScaleFactor(double* aContentsScaleFactor) {
+  *aContentsScaleFactor = [mScreen scale];
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(UIKitScreenManager, nsIScreenManager)
+
+UIKitScreenManager::UIKitScreenManager() : mScreen(new UIKitScreen([UIScreen mainScreen])) {}
+
+LayoutDeviceIntRect UIKitScreenManager::GetBounds() {
+  if (!gScreenBoundsSet) {
+    CGRect rect = [[UIScreen mainScreen] bounds];
+    CGFloat scale = [[UIScreen mainScreen] scale];
+    gScreenBounds.x = rect.origin.x * scale;
+    gScreenBounds.y = rect.origin.y * scale;
+    gScreenBounds.width = rect.size.width * scale;
+    gScreenBounds.height = rect.size.height * scale;
+    gScreenBoundsSet = true;
+  }
+  printf("UIKitScreenManager::GetBounds: %d %d %d %d\n", gScreenBounds.x, gScreenBounds.y,
+         gScreenBounds.width, gScreenBounds.height);
+  return gScreenBounds;
+}
+
+NS_IMETHODIMP
+UIKitScreenManager::GetPrimaryScreen(nsIScreen** outScreen) {
+  NS_IF_ADDREF(*outScreen = mScreen.get());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UIKitScreenManager::ScreenForRect(int32_t inLeft, int32_t inTop, int32_t inWidth, int32_t inHeight,
+                                  nsIScreen** outScreen) {
+  return GetPrimaryScreen(outScreen);
+}
diff --git a/widget/uikit/nsWidgetFactory.mm b/widget/uikit/nsWidgetFactory.mm
new file mode 100644
index 0000000000..7250d6ddad
--- /dev/null
+++ b/widget/uikit/nsWidgetFactory.mm
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsISupports.h"
+#include "mozilla/ModuleUtils.h"
+
+#include "nsWidgetsCID.h"
+
+#include "nsAppShell.h"
+#include "nsAppShellSingleton.h"
+#include "nsLookAndFeel.h"
+#include "nsScreenManager.h"
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(UIKitScreenManager)
+
+#include "GfxInfo.h"
+namespace mozilla {
+namespace widget {
+// This constructor should really be shared with all platforms.
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(GfxInfo, Init)
+}  // namespace widget
+}  // namespace mozilla
+
+NS_DEFINE_NAMED_CID(NS_APPSHELL_CID);
+NS_DEFINE_NAMED_CID(NS_SCREENMANAGER_CID);
+NS_DEFINE_NAMED_CID(NS_GFXINFO_CID);
+
+static const mozilla::Module::CIDEntry kWidgetCIDs[] = {
+    {&kNS_APPSHELL_CID, false, nullptr, nsAppShellConstructor},
+    {&kNS_SCREENMANAGER_CID, false, nullptr, UIKitScreenManagerConstructor},
+    {&kNS_GFXINFO_CID, false, nullptr, mozilla::widget::GfxInfoConstructor},
+    {nullptr}};
+
+static const mozilla::Module::ContractIDEntry kWidgetContracts[] = {
+    {"@mozilla.org/widget/appshell/uikit;1", &kNS_APPSHELL_CID},
+    {"@mozilla.org/gfx/screenmanager;1", &kNS_SCREENMANAGER_CID},
+    {"@mozilla.org/gfx/info;1", &kNS_GFXINFO_CID},
+    {nullptr}};
+
+static void nsWidgetUIKitModuleDtor() {
+  nsLookAndFeel::Shutdown();
+  nsAppShellShutdown();
+}
+
+extern const mozilla::Module kWidgetModule = {
+    mozilla::Module::kVersion, kWidgetCIDs, kWidgetContracts, nullptr, nullptr, nsAppShellInit,
+    nsWidgetUIKitModuleDtor};
diff --git a/widget/uikit/nsWindow.h b/widget/uikit/nsWindow.h
new file mode 100644
index 0000000000..ed36e1df63
--- /dev/null
+++ b/widget/uikit/nsWindow.h
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef NSWINDOW_H_
+#define NSWINDOW_H_
+
+#include "nsBaseWidget.h"
+#include "gfxPoint.h"
+
+#include "nsTArray.h"
+
+@class UIWindow;
+@class UIView;
+@class ChildView;
+
+class nsWindow final : public nsBaseWidget {
+  typedef nsBaseWidget Inherited;
+
+ public:
+  nsWindow();
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(nsWindow, Inherited)
+
+  //
+  // nsIWidget
+  //
+
+  [[nodiscard]] virtual nsresult Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
+                                        const LayoutDeviceIntRect& aRect,
+                                        widget::InitData* aInitData = nullptr) override;
+  virtual void Destroy() override;
+  virtual void Show(bool aState) override;
+  virtual void Enable(bool aState) override {}
+  virtual bool IsEnabled() const override { return true; }
+  virtual bool IsVisible() const override { return mVisible; }
+  virtual void SetFocus(Raise, mozilla::dom::CallerType aCallerType) override;
+  virtual LayoutDeviceIntPoint WidgetToScreenOffset() override;
+
+  virtual void SetBackgroundColor(const nscolor& aColor) override;
+  virtual void* GetNativeData(uint32_t aDataType) override;
+
+  virtual void Move(double aX, double aY) override;
+  virtual nsSizeMode SizeMode() override { return mSizeMode; }
+  virtual void SetSizeMode(nsSizeMode aMode) override;
+  void EnteredFullScreen(bool aFullScreen);
+  virtual void Resize(double aWidth, double aHeight, bool aRepaint) override;
+  virtual void Resize(double aX, double aY, double aWidth, double aHeight, bool aRepaint) override;
+  virtual LayoutDeviceIntRect GetScreenBounds() override;
+  void ReportMoveEvent();
+  void ReportSizeEvent();
+  void ReportSizeModeEvent(nsSizeMode aMode);
+
+  CGFloat BackingScaleFactor();
+  void BackingScaleFactorChanged();
+  virtual float GetDPI() override {
+    // XXX: terrible
+    return 326.0f;
+  }
+  virtual double GetDefaultScaleInternal() override { return BackingScaleFactor(); }
+  virtual int32_t RoundsWidgetCoordinatesTo() override;
+
+  virtual nsresult SetTitle(const nsAString& aTitle) override { return NS_OK; }
+
+  virtual void Invalidate(const LayoutDeviceIntRect& aRect) override;
+  virtual nsresult DispatchEvent(mozilla::WidgetGUIEvent* aEvent, nsEventStatus& aStatus) override;
+
+  void WillPaintWindow();
+  bool PaintWindow(LayoutDeviceIntRegion aRegion);
+
+  bool HasModalDescendents() { return false; }
+
+  // virtual nsresult
+  // NotifyIME(const IMENotification& aIMENotification) override;
+  virtual void SetInputContext(const InputContext& aContext, const InputContextAction& aAction);
+  virtual InputContext GetInputContext();
+  /*
+  virtual bool ExecuteNativeKeyBinding(
+                      NativeKeyBindingsType aType,
+                      const mozilla::WidgetKeyboardEvent& aEvent,
+                      DoCommandCallback aCallback,
+                      void* aCallbackData) override;
+  */
+
+ protected:
+  virtual ~nsWindow();
+  void BringToFront();
+  nsWindow* FindTopLevel();
+  bool IsTopLevel();
+  nsresult GetCurrentOffset(uint32_t& aOffset, uint32_t& aLength);
+  nsresult DeleteRange(int aOffset, int aLen);
+
+  void TearDownView();
+
+  ChildView* mNativeView;
+  bool mVisible;
+  nsSizeMode mSizeMode;
+  nsTArray<nsWindow*> mChildren;
+  nsWindow* mParent;
+  InputContext mInputContext;
+
+  void OnSizeChanged(const mozilla::gfx::IntSize& aSize);
+
+  static void DumpWindows();
+  static void DumpWindows(const nsTArray<nsWindow*>& wins, int indent = 0);
+  static void LogWindow(nsWindow* win, int index, int indent);
+};
+
+#endif /* NSWINDOW_H_ */
diff --git a/widget/uikit/nsWindow.mm b/widget/uikit/nsWindow.mm
new file mode 100644
index 0000000000..ba360f928e
--- /dev/null
+++ b/widget/uikit/nsWindow.mm
@@ -0,0 +1,728 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#import <UIKit/UIEvent.h>
+#import <UIKit/UIGraphics.h>
+#import <UIKit/UIInterface.h>
+#import <UIKit/UIScreen.h>
+#import <UIKit/UITapGestureRecognizer.h>
+#import <UIKit/UITouch.h>
+#import <UIKit/UIView.h>
+#import <UIKit/UIViewController.h>
+#import <UIKit/UIWindow.h>
+#import <QuartzCore/QuartzCore.h>
+
+#include <algorithm>
+
+#include "nsWindow.h"
+#include "nsScreenManager.h"
+#include "nsAppShell.h"
+
+#include "nsWidgetsCID.h"
+#include "nsGfxCIID.h"
+
+#include "gfxQuartzSurface.h"
+#include "gfxUtils.h"
+#include "gfxImageSurface.h"
+#include "gfxContext.h"
+#include "nsRegion.h"
+#include "Layers.h"
+#include "nsTArray.h"
+
+#include "mozilla/BasicEvents.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/TouchEvents.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/MouseEventBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::layers;
+
+#define ALOG(args...)    \
+  fprintf(stderr, args); \
+  fprintf(stderr, "\n")
+
+static LayoutDeviceIntPoint UIKitPointsToDevPixels(CGPoint aPoint, CGFloat aBackingScale) {
+  return LayoutDeviceIntPoint(NSToIntRound(aPoint.x * aBackingScale),
+                              NSToIntRound(aPoint.y * aBackingScale));
+}
+
+static CGRect DevPixelsToUIKitPoints(const LayoutDeviceIntRect& aRect, CGFloat aBackingScale) {
+  return CGRectMake((CGFloat)aRect.x / aBackingScale, (CGFloat)aRect.y / aBackingScale,
+                    (CGFloat)aRect.width / aBackingScale, (CGFloat)aRect.height / aBackingScale);
+}
+
+// Used to retain a Cocoa object for the remainder of a method's execution.
+class nsAutoRetainUIKitObject {
+ public:
+  nsAutoRetainUIKitObject(id anObject) { mObject = [anObject retain]; }
+  ~nsAutoRetainUIKitObject() { [mObject release]; }
+
+ private:
+  id mObject;  // [STRONG]
+};
+
+@interface ChildView : UIView {
+ @public
+  nsWindow* mGeckoChild;  // weak ref
+  BOOL mWaitingForPaint;
+  CFMutableDictionaryRef mTouches;
+  int mNextTouchID;
+}
+// sets up our view, attaching it to its owning gecko view
+- (id)initWithFrame:(CGRect)inFrame geckoChild:(nsWindow*)inChild;
+// Our Gecko child was Destroy()ed
+- (void)widgetDestroyed;
+// Tear down this ChildView
+- (void)delayedTearDown;
+- (void)sendMouseEvent:(EventMessage)aType
+                 point:(LayoutDeviceIntPoint)aPoint
+                widget:(nsWindow*)aWindow;
+- (void)handleTap:(UITapGestureRecognizer*)sender;
+- (BOOL)isUsingMainThreadOpenGL;
+- (void)drawUsingOpenGL;
+- (void)drawUsingOpenGLCallback;
+- (void)sendTouchEvent:(EventMessage)aType touches:(NSSet*)aTouches widget:(nsWindow*)aWindow;
+// Event handling (UIResponder)
+- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
+- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event;
+- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event;
+- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event;
+@end
+
+@implementation ChildView
++ (Class)layerClass {
+  return [CAEAGLLayer class];
+}
+
+- (id)initWithFrame:(CGRect)inFrame geckoChild:(nsWindow*)inChild {
+  self.multipleTouchEnabled = YES;
+  if ((self = [super initWithFrame:inFrame])) {
+    mGeckoChild = inChild;
+  }
+  ALOG("[ChildView[%p] initWithFrame:] (mGeckoChild = %p)", (void*)self, (void*)mGeckoChild);
+  self.opaque = YES;
+  self.alpha = 1.0;
+
+  UITapGestureRecognizer* tapRecognizer =
+      [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
+  tapRecognizer.numberOfTapsRequired = 1;
+  [self addGestureRecognizer:tapRecognizer];
+
+  mTouches = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, nullptr, nullptr);
+  mNextTouchID = 0;
+  return self;
+}
+
+- (void)widgetDestroyed {
+  mGeckoChild = nullptr;
+  CFRelease(mTouches);
+}
+
+- (void)delayedTearDown {
+  [self removeFromSuperview];
+  [self release];
+}
+
+- (void)sendMouseEvent:(EventMessage)aType
+                 point:(LayoutDeviceIntPoint)aPoint
+                widget:(nsWindow*)aWindow {
+  WidgetMouseEvent event(true, aType, aWindow, WidgetMouseEvent::eReal, WidgetMouseEvent::eNormal);
+
+  event.mRefPoint = aPoint;
+  event.mClickCount = 1;
+  event.button = MouseButton::ePrimary;
+  event.mTime = PR_IntervalNow();
+  event.inputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+
+  nsEventStatus status;
+  aWindow->DispatchEvent(&event, status);
+}
+
+- (void)handleTap:(UITapGestureRecognizer*)sender {
+  if (sender.state == UIGestureRecognizerStateEnded) {
+    ALOG("[ChildView[%p] handleTap]", self);
+    LayoutDeviceIntPoint lp =
+        UIKitPointsToDevPixels([sender locationInView:self], [self contentScaleFactor]);
+    [self sendMouseEvent:eMouseMove point:lp widget:mGeckoChild];
+    [self sendMouseEvent:eMouseDown point:lp widget:mGeckoChild];
+    [self sendMouseEvent:eMouseUp point:lp widget:mGeckoChild];
+  }
+}
+
+- (void)sendTouchEvent:(EventMessage)aType touches:(NSSet*)aTouches widget:(nsWindow*)aWindow {
+  WidgetTouchEvent event(true, aType, aWindow);
+  // XXX: I think nativeEvent.timestamp * 1000 is probably usable here but
+  // I don't care that much right now.
+  event.mTime = PR_IntervalNow();
+  event.mTouches.SetCapacity(aTouches.count);
+  for (UITouch* touch in aTouches) {
+    LayoutDeviceIntPoint loc =
+        UIKitPointsToDevPixels([touch locationInView:self], [self contentScaleFactor]);
+    LayoutDeviceIntPoint radius = UIKitPointsToDevPixels([touch majorRadius], [touch majorRadius]);
+    void* value;
+    if (!CFDictionaryGetValueIfPresent(mTouches, touch, (const void**)&value)) {
+      // This shouldn't happen.
+      NS_ASSERTION(false, "Got a touch that we didn't know about");
+      continue;
+    }
+    int id = reinterpret_cast<int>(value);
+    RefPtr<Touch> t = new Touch(id, loc, radius, 0.0f, 1.0f);
+    event.mRefPoint = loc;
+    event.mTouches.AppendElement(t);
+  }
+  aWindow->DispatchInputEvent(&event);
+}
+
+- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
+  ALOG("[ChildView[%p] touchesBegan", self);
+  if (!mGeckoChild) return;
+
+  for (UITouch* touch : touches) {
+    CFDictionaryAddValue(mTouches, touch, (void*)mNextTouchID);
+    mNextTouchID++;
+  }
+  [self sendTouchEvent:eTouchStart touches:[event allTouches] widget:mGeckoChild];
+}
+
+- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
+  ALOG("[ChildView[%p] touchesCancelled", self);
+  [self sendTouchEvent:eTouchCancel touches:touches widget:mGeckoChild];
+  for (UITouch* touch : touches) {
+    CFDictionaryRemoveValue(mTouches, touch);
+  }
+  if (CFDictionaryGetCount(mTouches) == 0) {
+    mNextTouchID = 0;
+  }
+}
+
+- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
+  ALOG("[ChildView[%p] touchesEnded", self);
+  if (!mGeckoChild) return;
+
+  [self sendTouchEvent:eTouchEnd touches:touches widget:mGeckoChild];
+  for (UITouch* touch : touches) {
+    CFDictionaryRemoveValue(mTouches, touch);
+  }
+  if (CFDictionaryGetCount(mTouches) == 0) {
+    mNextTouchID = 0;
+  }
+}
+
+- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
+  ALOG("[ChildView[%p] touchesMoved", self);
+  if (!mGeckoChild) return;
+
+  [self sendTouchEvent:eTouchMove touches:[event allTouches] widget:mGeckoChild];
+}
+
+- (void)setNeedsDisplayInRect:(CGRect)aRect {
+  if ([self isUsingMainThreadOpenGL]) {
+    // Draw without calling drawRect. This prevent us from
+    // needing to access the normal window buffer surface unnecessarily, so we
+    // waste less time synchronizing the two surfaces.
+    if (!mWaitingForPaint) {
+      mWaitingForPaint = YES;
+      // Use NSRunLoopCommonModes instead of the default NSDefaultRunLoopMode
+      // so that the timer also fires while a native menu is open.
+      [self performSelector:@selector(drawUsingOpenGLCallback)
+                 withObject:nil
+                 afterDelay:0
+                    inModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
+    }
+  }
+}
+
+- (BOOL)isUsingMainThreadOpenGL {
+  if (!mGeckoChild || ![self window]) return NO;
+
+  return NO;
+}
+
+- (void)drawUsingOpenGL {
+  ALOG("drawUsingOpenGL");
+  AUTO_PROFILER_LABEL("ChildView::drawUsingOpenGL", OTHER);
+
+  if (!mGeckoChild->IsVisible()) return;
+
+  mWaitingForPaint = NO;
+
+  LayoutDeviceIntRect geckoBounds = mGeckoChild->GetBounds();
+  LayoutDeviceIntRegion region(geckoBounds);
+
+  mGeckoChild->PaintWindow(region);
+}
+
+// Called asynchronously after setNeedsDisplay in order to avoid entering the
+// normal drawing machinery.
+- (void)drawUsingOpenGLCallback {
+  if (mWaitingForPaint) {
+    [self drawUsingOpenGL];
+  }
+}
+
+// The display system has told us that a portion of our view is dirty. Tell
+// gecko to paint it
+- (void)drawRect:(CGRect)aRect {
+  CGContextRef cgContext = UIGraphicsGetCurrentContext();
+  [self drawRect:aRect inContext:cgContext];
+}
+
+- (void)drawRect:(CGRect)aRect inContext:(CGContextRef)aContext {
+#ifdef DEBUG_UPDATE
+  LayoutDeviceIntRect geckoBounds = mGeckoChild->GetBounds();
+
+  fprintf(stderr, "---- Update[%p][%p] [%f %f %f %f] cgc: %p\n  gecko bounds: [%d %d %d %d]\n",
+          self, mGeckoChild, aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height,
+          aContext, geckoBounds.x, geckoBounds.y, geckoBounds.width, geckoBounds.height);
+
+  CGAffineTransform xform = CGContextGetCTM(aContext);
+  fprintf(stderr, "  xform in: [%f %f %f %f %f %f]\n", xform.a, xform.b, xform.c, xform.d, xform.tx,
+          xform.ty);
+#endif
+
+  if (true) {
+    // For Gecko-initiated repaints in OpenGL mode, drawUsingOpenGL is
+    // directly called from a delayed perform callback - without going through
+    // drawRect.
+    // Paints that come through here are triggered by something that Cocoa
+    // controls, for example by window resizing or window focus changes.
+
+    // Do GL composition and return.
+    [self drawUsingOpenGL];
+    return;
+  }
+  AUTO_PROFILER_LABEL("ChildView::drawRect", OTHER);
+
+  // The CGContext that drawRect supplies us with comes with a transform that
+  // scales one user space unit to one Cocoa point, which can consist of
+  // multiple dev pixels. But Gecko expects its supplied context to be scaled
+  // to device pixels, so we need to reverse the scaling.
+  double scale = mGeckoChild->BackingScaleFactor();
+  CGContextSaveGState(aContext);
+  CGContextScaleCTM(aContext, 1.0 / scale, 1.0 / scale);
+
+  CGSize viewSize = [self bounds].size;
+  gfx::IntSize backingSize(viewSize.width * scale, viewSize.height * scale);
+
+  CGContextSaveGState(aContext);
+
+  LayoutDeviceIntRegion region = LayoutDeviceIntRect(
+      NSToIntRound(aRect.origin.x * scale), NSToIntRound(aRect.origin.y * scale),
+      NSToIntRound(aRect.size.width * scale), NSToIntRound(aRect.size.height * scale));
+
+  // Create Cairo objects.
+  RefPtr<gfxQuartzSurface> targetSurface;
+
+  UniquePtrPtr<gfxContext> targetContext;
+  if (gfxPlatform::GetPlatform()->SupportsAzureContentForType(gfx::BackendType::CAIRO)) {
+    // This is dead code unless you mess with prefs, but keep it around for
+    // debugging.
+    targetSurface = new gfxQuartzSurface(aContext, backingSize);
+    targetSurface->SetAllowUseAsSource(false);
+    RefPtr<gfx::DrawTarget> dt =
+        gfxPlatform::CreateDrawTargetForSurface(targetSurface, backingSize);
+    if (!dt || !dt->IsValid()) {
+      gfxDevCrash(mozilla::gfx::LogReason::InvalidContext)
+          << "Window context problem 2 " << backingSize;
+      return;
+    }
+    targetContext = gfxContext::CreateOrNull(dt);
+  } else {
+    MOZ_ASSERT_UNREACHABLE("COREGRAPHICS is the only supported backend");
+  }
+  MOZ_ASSERT(targetContext);  // already checked for valid draw targets above
+
+  // Set up the clip region.
+  targetContext->NewPath();
+  for (auto iter = region.RectIter(); !iter.Done(); iter.Next()) {
+    const LayoutDeviceIntRect& r = iter.Get();
+    targetContext->Rectangle(gfxRect(r.x, r.y, r.width, r.height));
+  }
+  targetContext->Clip();
+
+  // nsAutoRetainCocoaObject kungFuDeathGrip(self);
+  bool painted = false;
+  targetContext = nullptr;
+  targetSurface = nullptr;
+
+  CGContextRestoreGState(aContext);
+
+  // Undo the scale transform so that from now on the context is in
+  // CocoaPoints again.
+  CGContextRestoreGState(aContext);
+  if (!painted && [self isOpaque]) {
+    // Gecko refused to draw, but we've claimed to be opaque, so we have to
+    // draw something--fill with white.
+    CGContextSetRGBFillColor(aContext, 1, 1, 1, 1);
+    CGContextFillRect(aContext, aRect);
+  }
+
+#ifdef DEBUG_UPDATE
+  fprintf(stderr, "---- update done ----\n");
+
+#  if 0
+  CGContextSetRGBStrokeColor (aContext,
+                            ((((unsigned long)self) & 0xff)) / 255.0,
+                            ((((unsigned long)self) & 0xff00) >> 8) / 255.0,
+                            ((((unsigned long)self) & 0xff0000) >> 16) / 255.0,
+                            0.5);
+#  endif
+  CGContextSetRGBStrokeColor(aContext, 1, 0, 0, 0.8);
+  CGContextSetLineWidth(aContext, 4.0);
+  CGContextStrokeRect(aContext, aRect);
+#endif
+}
+@end
+
+nsWindow::nsWindow()
+    : mNativeView(nullptr), mVisible(false), mSizeMode(nsSizeMode_Normal), mParent(nullptr) {}
+
+nsWindow::~nsWindow() {
+  [mNativeView widgetDestroyed];  // Safe if mNativeView is nil.
+  TearDownView();                 // Safe if called twice.
+}
+
+void nsWindow::TearDownView() {
+  if (!mNativeView) return;
+
+  [mNativeView performSelectorOnMainThread:@selector(delayedTearDown)
+                                withObject:nil
+                             waitUntilDone:false];
+  mNativeView = nil;
+}
+
+bool nsWindow::IsTopLevel() {
+  return mWindowType == WindowType::TopLevel || mWindowType == WindowType::Dialog ||
+         mWindowType == WindowType::Invisible;
+}
+
+//
+// nsIWidget
+//
+
+nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
+                          const LayoutDeviceIntRect& aRect, widget::InitData* aInitData) {
+  ALOG("nsWindow[%p]::Create %p/%p [%d %d %d %d]", (void*)this, (void*)aParent,
+       (void*)aNativeParent, aRect.x, aRect.y, aRect.width, aRect.height);
+  nsWindow* parent = (nsWindow*)aParent;
+  ChildView* nativeParent = (ChildView*)aNativeParent;
+
+  if (parent == nullptr && nativeParent) parent = nativeParent->mGeckoChild;
+  if (parent && nativeParent == nullptr) nativeParent = parent->mNativeView;
+
+  // for toplevel windows, bounds are fixed to full screen size
+  if (parent == nullptr) {
+    if (nsAppShell::gWindow == nil) {
+      mBounds = UIKitScreenManager::GetBounds();
+    } else {
+      CGRect cgRect = [nsAppShell::gWindow bounds];
+      mBounds.x = cgRect.origin.x;
+      mBounds.y = cgRect.origin.y;
+      mBounds.width = cgRect.size.width;
+      mBounds.height = cgRect.size.height;
+    }
+  } else {
+    mBounds = aRect;
+  }
+
+  ALOG("nsWindow[%p]::Create bounds: %d %d %d %d", (void*)this, mBounds.x, mBounds.y, mBounds.width,
+       mBounds.height);
+
+  // Set defaults which can be overriden from aInitData in BaseCreate
+  mWindowType = WindowType::TopLevel;
+  mBorderStyle = BorderStyle::Default;
+
+  Inherited::BaseCreate(aParent, aInitData);
+
+  NS_ASSERTION(IsTopLevel() || parent, "non top level window doesn't have a parent!");
+
+  mNativeView =
+      [[ChildView alloc] initWithFrame:DevPixelsToUIKitPoints(mBounds, BackingScaleFactor())
+                            geckoChild:this];
+  mNativeView.hidden = YES;
+
+  if (parent) {
+    parent->mChildren.AppendElement(this);
+    mParent = parent;
+  }
+
+  if (nativeParent) {
+    [nativeParent addSubview:mNativeView];
+  } else if (nsAppShell::gWindow) {
+    [nsAppShell::gWindow.rootViewController.view addSubview:mNativeView];
+  } else {
+    [nsAppShell::gTopLevelViews addObject:mNativeView];
+  }
+
+  return NS_OK;
+}
+
+void nsWindow::Destroy() {
+  for (uint32_t i = 0; i < mChildren.Length(); ++i) {
+    // why do we still have children?
+    mChildren[i]->SetParent(nullptr);
+  }
+
+  if (mParent) mParent->mChildren.RemoveElement(this);
+
+  [mNativeView widgetDestroyed];
+
+  nsBaseWidget::Destroy();
+
+  // ReportDestroyEvent();
+
+  TearDownView();
+
+  nsBaseWidget::OnDestroy();
+
+  return NS_OK;
+}
+
+void nsWindow::Show(bool aState) {
+  if (aState != mVisible) {
+    mNativeView.hidden = aState ? NO : YES;
+    if (aState) {
+      UIView* parentView =
+          mParent ? mParent->mNativeView : nsAppShell::gWindow.rootViewController.view;
+      [parentView bringSubviewToFront:mNativeView];
+      [mNativeView setNeedsDisplay];
+    }
+    mVisible = aState;
+  }
+}
+
+void nsWindow::Move(double aX, double aY) {
+  if (!mNativeView || (mBounds.x == aX && mBounds.y == aY)) return;
+
+  // XXX: handle this
+  // The point we have is in Gecko coordinates (origin top-left). Convert
+  // it to Cocoa ones (origin bottom-left).
+  mBounds.x = aX;
+  mBounds.y = aY;
+
+  mNativeView.frame = DevPixelsToUIKitPoints(mBounds, BackingScaleFactor());
+
+  if (mVisible) [mNativeView setNeedsDisplay];
+
+  ReportMoveEvent();
+}
+
+void nsWindow::Resize(double aX, double aY, double aWidth, double aHeight, bool aRepaint) {
+  BOOL isMoving = (mBounds.x != aX || mBounds.y != aY);
+  BOOL isResizing = (mBounds.width != aWidth || mBounds.height != aHeight);
+  if (!mNativeView || (!isMoving && !isResizing)) return;
+
+  if (isMoving) {
+    mBounds.x = aX;
+    mBounds.y = aY;
+  }
+  if (isResizing) {
+    mBounds.width = aWidth;
+    mBounds.height = aHeight;
+  }
+
+  [mNativeView setFrame:DevPixelsToUIKitPoints(mBounds, BackingScaleFactor())];
+
+  if (mVisible && aRepaint) [mNativeView setNeedsDisplay];
+
+  if (isMoving) ReportMoveEvent();
+
+  if (isResizing) ReportSizeEvent();
+}
+
+void nsWindow::Resize(double aWidth, double aHeight, bool aRepaint) {
+  if (!mNativeView || (mBounds.width == aWidth && mBounds.height == aHeight)) return;
+
+  mBounds.width = aWidth;
+  mBounds.height = aHeight;
+
+  [mNativeView setFrame:DevPixelsToUIKitPoints(mBounds, BackingScaleFactor())];
+
+  if (mVisible && aRepaint) [mNativeView setNeedsDisplay];
+
+  ReportSizeEvent();
+}
+
+void nsWindow::SetSizeMode(nsSizeMode aMode) {
+  if (aMode == static_cast<int32_t>(mSizeMode)) {
+    return;
+  }
+
+  mSizeMode = static_cast<nsSizeMode>(aMode);
+  if (aMode == nsSizeMode_Maximized || aMode == nsSizeMode_Fullscreen) {
+    // Resize to fill screen
+    nsBaseWidget::InfallibleMakeFullScreen(true);
+  }
+  ReportSizeModeEvent(aMode);
+}
+
+void nsWindow::Invalidate(const LayoutDeviceIntRect& aRect) {
+  if (!mNativeView || !mVisible) return;
+
+  MOZ_RELEASE_ASSERT(GetLayerManager()->GetBackendType() != LayersBackend::LAYERS_WR,
+                     "Shouldn't need to invalidate with accelerated OMTC layers!");
+
+  [mNativeView setNeedsLayout];
+  [mNativeView setNeedsDisplayInRect:DevPixelsToUIKitPoints(mBounds, BackingScaleFactor())];
+}
+
+void nsWindow::SetFocus(Raise) {
+  [[mNativeView window] makeKeyWindow];
+  [mNativeView becomeFirstResponder];
+}
+
+void nsWindow::WillPaintWindow() {
+  if (mWidgetListener) {
+    mWidgetListener->WillPaintWindow(this);
+  }
+}
+
+bool nsWindow::PaintWindow(LayoutDeviceIntRegion aRegion) {
+  if (!mWidgetListener) return false;
+
+  bool returnValue = false;
+  returnValue = mWidgetListener->PaintWindow(this, aRegion);
+
+  if (mWidgetListener) {
+    mWidgetListener->DidPaintWindow();
+  }
+
+  return returnValue;
+}
+
+void nsWindow::ReportMoveEvent() { NotifyWindowMoved(mBounds.x, mBounds.y); }
+
+void nsWindow::ReportSizeModeEvent(nsSizeMode aMode) {
+  if (mWidgetListener) {
+    // This is terrible.
+    nsSizeMode theMode;
+    switch (aMode) {
+      case nsSizeMode_Maximized:
+        theMode = nsSizeMode_Maximized;
+        break;
+      case nsSizeMode_Fullscreen:
+        theMode = nsSizeMode_Fullscreen;
+        break;
+      default:
+        return;
+    }
+    mWidgetListener->SizeModeChanged(theMode);
+  }
+}
+
+void nsWindow::ReportSizeEvent() {
+  if (mWidgetListener) {
+    LayoutDeviceIntRect innerBounds = GetClientBounds();
+    mWidgetListener->WindowResized(this, innerBounds.width, innerBounds.height);
+  }
+}
+
+LayoutDeviceIntRect nsWindow::GetScreenBounds() {
+  return LayoutDeviceIntRect(WidgetToScreenOffset(), mBounds.Size());
+}
+
+LayoutDeviceIntPoint nsWindow::WidgetToScreenOffset() {
+  LayoutDeviceIntPoint offset(0, 0);
+  if (mParent) {
+    offset = mParent->WidgetToScreenOffset();
+  }
+
+  CGPoint temp = [mNativeView convertPoint:temp toView:nil];
+
+  if (!mParent && nsAppShell::gWindow) {
+    // convert to screen coords
+    temp = [nsAppShell::gWindow convertPoint:temp toWindow:nil];
+  }
+
+  offset.x += temp.x;
+  offset.y += temp.y;
+
+  return offset;
+}
+
+nsresult nsWindow::DispatchEvent(mozilla::WidgetGUIEvent* aEvent, nsEventStatus& aStatus) {
+  aStatus = nsEventStatus_eIgnore;
+  nsCOMPtr<nsIWidget> kungFuDeathGrip(aEvent->mWidget);
+
+  if (mWidgetListener) aStatus = mWidgetListener->HandleEvent(aEvent, mUseAttachedEvents);
+
+  return NS_OK;
+}
+
+void nsWindow::SetInputContext(const InputContext& aContext, const InputContextAction& aAction) {
+  // TODO: actually show VKB
+  mInputContext = aContext;
+}
+
+mozilla::widget::InputContext nsWindow::GetInputContext() { return mInputContext; }
+
+void nsWindow::SetBackgroundColor(const nscolor& aColor) {
+  mNativeView.backgroundColor = [UIColor colorWithRed:NS_GET_R(aColor)
+                                                green:NS_GET_G(aColor)
+                                                 blue:NS_GET_B(aColor)
+                                                alpha:NS_GET_A(aColor)];
+}
+
+void* nsWindow::GetNativeData(uint32_t aDataType) {
+  void* retVal = nullptr;
+
+  switch (aDataType) {
+    case NS_NATIVE_WIDGET:
+      retVal = (void*)mNativeView;
+      break;
+
+    case NS_NATIVE_WINDOW:
+      retVal = [mNativeView window];
+      break;
+
+    case NS_NATIVE_GRAPHIC:
+      NS_ERROR("Requesting NS_NATIVE_GRAPHIC on a UIKit child view!");
+      break;
+
+    case NS_NATIVE_OFFSETX:
+      retVal = 0;
+      break;
+
+    case NS_NATIVE_OFFSETY:
+      retVal = 0;
+      break;
+
+    case NS_RAW_NATIVE_IME_CONTEXT:
+      retVal = GetPseudoIMEContext();
+      if (retVal) {
+        break;
+      }
+      retVal = NS_ONLY_ONE_NATIVE_IME_CONTEXT;
+      break;
+  }
+
+  return retVal;
+}
+
+CGFloat nsWindow::BackingScaleFactor() {
+  if (mNativeView) {
+    return [mNativeView contentScaleFactor];
+  }
+  return [UIScreen mainScreen].scale;
+}
+
+int32_t nsWindow::RoundsWidgetCoordinatesTo() {
+  if (BackingScaleFactor() == 2.0) {
+    return 2;
+  }
+  return 1;
+}
+
+already_AddRefed<nsIWidget> nsIWidget::CreateTopLevelWindow() {
+  nsCOMPtr<nsIWidget> window = new nsWindow();
+  return window.forget();
+}
+
+already_AddRefed<nsIWidget> nsIWidget::CreateChildWindow() {
+  nsCOMPtr<nsIWidget> window = new nsWindow();
+  return window.forget();
+}