Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 861 insertions, 0 deletions

diff --git a/widget/windows/WindowsUIUtils.cpp b/widget/windows/WindowsUIUtils.cpp
new file mode 100644
index 0000000000..b6db950555
--- /dev/null
+++ b/widget/windows/WindowsUIUtils.cpp
@@ -0,0 +1,861 @@
+/* -*- 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 <windows.h>
+#include <winsdkver.h>
+#include <wrl.h>
+
+#include "nsServiceManagerUtils.h"
+
+#include "WindowsUIUtils.h"
+
+#include "nsIObserverService.h"
+#include "nsIAppShellService.h"
+#include "nsAppShellCID.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/WidgetUtils.h"
+#include "mozilla/WindowsVersion.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/media/MediaUtils.h"
+#include "nsString.h"
+#include "nsIWidget.h"
+#include "nsIWindowMediator.h"
+#include "nsPIDOMWindow.h"
+#include "nsWindowGfx.h"
+#include "Units.h"
+
+/* mingw currently doesn't support windows.ui.viewmanagement.h, so we disable it
+ * until it's fixed. */
+
+// See
+// https://github.com/tpn/winsdk-10/blob/master/Include/10.0.14393.0/winrt/windows.ui.viewmanagement.h
+// for the source of some of these definitions for older SDKs.
+#ifndef __MINGW32__
+
+#  include <inspectable.h>
+#  include <roapi.h>
+#  include <windows.ui.viewmanagement.h>
+
+#  pragma comment(lib, "runtimeobject.lib")
+
+using namespace ABI::Windows::UI;
+using namespace ABI::Windows::UI::ViewManagement;
+using namespace Microsoft::WRL;
+using namespace Microsoft::WRL::Wrappers;
+using namespace ABI::Windows::Foundation;
+using namespace ABI::Windows::ApplicationModel::DataTransfer;
+
+/* All of this is win10 stuff and we're compiling against win81 headers
+ * for now, so we may need to do some legwork: */
+#  if WINVER_MAXVER < 0x0A00
+namespace ABI {
+namespace Windows {
+namespace UI {
+namespace ViewManagement {
+enum UserInteractionMode {
+  UserInteractionMode_Mouse = 0,
+  UserInteractionMode_Touch = 1
+};
+}
+}  // namespace UI
+}  // namespace Windows
+}  // namespace ABI
+
+#  endif
+
+#  ifndef RuntimeClass_Windows_UI_ViewManagement_UIViewSettings
+#    define RuntimeClass_Windows_UI_ViewManagement_UIViewSettings \
+      L"Windows.UI.ViewManagement.UIViewSettings"
+#  endif
+
+#  if WINVER_MAXVER < 0x0A00
+namespace ABI {
+namespace Windows {
+namespace UI {
+namespace ViewManagement {
+interface IUIViewSettings;
+MIDL_INTERFACE("C63657F6-8850-470D-88F8-455E16EA2C26")
+IUIViewSettings : public IInspectable {
+ public:
+  virtual HRESULT STDMETHODCALLTYPE get_UserInteractionMode(
+      UserInteractionMode * value) = 0;
+};
+
+extern const __declspec(selectany) IID& IID_IUIViewSettings =
+    __uuidof(IUIViewSettings);
+}  // namespace ViewManagement
+}  // namespace UI
+}  // namespace Windows
+}  // namespace ABI
+#  endif
+
+#  ifndef IUIViewSettingsInterop
+
+using IUIViewSettingsInterop = interface IUIViewSettingsInterop;
+
+MIDL_INTERFACE("3694dbf9-8f68-44be-8ff5-195c98ede8a6")
+IUIViewSettingsInterop : public IInspectable {
+ public:
+  virtual HRESULT STDMETHODCALLTYPE GetForWindow(HWND hwnd, REFIID riid,
+                                                 void** ppv) = 0;
+};
+#  endif
+
+#  ifndef __IDataTransferManagerInterop_INTERFACE_DEFINED__
+#    define __IDataTransferManagerInterop_INTERFACE_DEFINED__
+
+using IDataTransferManagerInterop = interface IDataTransferManagerInterop;
+
+MIDL_INTERFACE("3A3DCD6C-3EAB-43DC-BCDE-45671CE800C8")
+IDataTransferManagerInterop : public IUnknown {
+ public:
+  virtual HRESULT STDMETHODCALLTYPE GetForWindow(
+      HWND appWindow, REFIID riid, void** dataTransferManager) = 0;
+  virtual HRESULT STDMETHODCALLTYPE ShowShareUIForWindow(HWND appWindow) = 0;
+};
+
+#  endif
+
+#  if !defined( \
+      ____x_ABI_CWindows_CApplicationModel_CDataTransfer_CIDataPackage4_INTERFACE_DEFINED__)
+#    define ____x_ABI_CWindows_CApplicationModel_CDataTransfer_CIDataPackage4_INTERFACE_DEFINED__
+
+MIDL_INTERFACE("13a24ec8-9382-536f-852a-3045e1b29a3b")
+IDataPackage4 : public IInspectable {
+ public:
+  virtual HRESULT STDMETHODCALLTYPE add_ShareCanceled(
+      __FITypedEventHandler_2_Windows__CApplicationModel__CDataTransfer__CDataPackage_IInspectable *
+          handler,
+      EventRegistrationToken * token) = 0;
+  virtual HRESULT STDMETHODCALLTYPE remove_ShareCanceled(
+      EventRegistrationToken token) = 0;
+};
+
+#  endif
+
+#  ifndef RuntimeClass_Windows_UI_ViewManagement_UISettings
+#    define RuntimeClass_Windows_UI_ViewManagement_UISettings \
+      L"Windows.UI.ViewManagement.UISettings"
+#  endif
+#  if WINDOWS_FOUNDATION_UNIVERSALAPICONTRACT_VERSION < 0x80000
+namespace ABI {
+namespace Windows {
+namespace UI {
+namespace ViewManagement {
+
+class UISettings;
+class UISettingsAutoHideScrollBarsChangedEventArgs;
+interface IUISettingsAutoHideScrollBarsChangedEventArgs;
+MIDL_INTERFACE("87afd4b2-9146-5f02-8f6b-06d454174c0f")
+IUISettingsAutoHideScrollBarsChangedEventArgs : public IInspectable{};
+
+}  // namespace ViewManagement
+}  // namespace UI
+}  // namespace Windows
+}  // namespace ABI
+
+namespace ABI {
+namespace Windows {
+namespace Foundation {
+
+template <>
+struct __declspec(uuid("808aef30-2660-51b0-9c11-f75dd42006b4"))
+    ITypedEventHandler<ABI::Windows::UI::ViewManagement::UISettings*,
+                       ABI::Windows::UI::ViewManagement::
+                           UISettingsAutoHideScrollBarsChangedEventArgs*>
+    : ITypedEventHandler_impl<
+          ABI::Windows::Foundation::Internal::AggregateType<
+              ABI::Windows::UI::ViewManagement::UISettings*,
+              ABI::Windows::UI::ViewManagement::IUISettings*>,
+          ABI::Windows::Foundation::Internal::AggregateType<
+              ABI::Windows::UI::ViewManagement::
+                  UISettingsAutoHideScrollBarsChangedEventArgs*,
+              ABI::Windows::UI::ViewManagement::
+                  IUISettingsAutoHideScrollBarsChangedEventArgs*>> {
+  static const wchar_t* z_get_rc_name_impl() {
+    return L"Windows.Foundation.TypedEventHandler`2<Windows.UI.ViewManagement."
+           L"UISettings, "
+           L"Windows.UI.ViewManagement."
+           L"UISettingsAutoHideScrollBarsChangedEventArgs>";
+  }
+};
+// Define a typedef for the parameterized interface specialization's mangled
+// name. This allows code which uses the mangled name for the parameterized
+// interface to access the correct parameterized interface specialization.
+typedef ITypedEventHandler<ABI::Windows::UI::ViewManagement::UISettings*,
+                           ABI::Windows::UI::ViewManagement::
+                               UISettingsAutoHideScrollBarsChangedEventArgs*>
+    __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs_t;
+#    define __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs \
+      ABI::Windows::Foundation::                                                                                                                            \
+          __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs_t
+
+}  // namespace Foundation
+}  // namespace Windows
+}  // namespace ABI
+
+namespace ABI {
+namespace Windows {
+namespace UI {
+namespace ViewManagement {
+class UISettings;
+class UISettingsAutoHideScrollBarsChangedEventArgs;
+interface IUISettings5;
+MIDL_INTERFACE("5349d588-0cb5-5f05-bd34-706b3231f0bd")
+IUISettings5 : public IInspectable {
+ public:
+  virtual HRESULT STDMETHODCALLTYPE get_AutoHideScrollBars(boolean * value) = 0;
+  virtual HRESULT STDMETHODCALLTYPE add_AutoHideScrollBarsChanged(
+      __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs *
+          handler,
+      EventRegistrationToken * token) = 0;
+  virtual HRESULT STDMETHODCALLTYPE remove_AutoHideScrollBarsChanged(
+      EventRegistrationToken token) = 0;
+};
+}  // namespace ViewManagement
+}  // namespace UI
+}  // namespace Windows
+}  // namespace ABI
+#  endif
+#endif
+
+using namespace mozilla;
+
+enum class TabletModeState : uint8_t { Unknown, Off, On };
+static TabletModeState sInTabletModeState;
+
+WindowsUIUtils::WindowsUIUtils() = default;
+WindowsUIUtils::~WindowsUIUtils() = default;
+
+NS_IMPL_ISUPPORTS(WindowsUIUtils, nsIWindowsUIUtils)
+
+NS_IMETHODIMP
+WindowsUIUtils::GetSystemSmallIconSize(int32_t* aSize) {
+  NS_ENSURE_ARG(aSize);
+
+  mozilla::LayoutDeviceIntSize size =
+      nsWindowGfx::GetIconMetrics(nsWindowGfx::kSmallIcon);
+  *aSize = std::max(size.width, size.height);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::GetSystemLargeIconSize(int32_t* aSize) {
+  NS_ENSURE_ARG(aSize);
+
+  mozilla::LayoutDeviceIntSize size =
+      nsWindowGfx::GetIconMetrics(nsWindowGfx::kRegularIcon);
+  *aSize = std::max(size.width, size.height);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::SetWindowIcon(mozIDOMWindowProxy* aWindow,
+                              imgIContainer* aSmallIcon,
+                              imgIContainer* aBigIcon) {
+  NS_ENSURE_ARG(aWindow);
+
+  nsCOMPtr<nsIWidget> widget =
+      nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
+  nsWindow* window = static_cast<nsWindow*>(widget.get());
+
+  nsresult rv;
+
+  if (aSmallIcon) {
+    HICON hIcon = nullptr;
+    rv = nsWindowGfx::CreateIcon(
+        aSmallIcon, false, mozilla::LayoutDeviceIntPoint(),
+        nsWindowGfx::GetIconMetrics(nsWindowGfx::kSmallIcon), &hIcon);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    window->SetSmallIcon(hIcon);
+  }
+
+  if (aBigIcon) {
+    HICON hIcon = nullptr;
+    rv = nsWindowGfx::CreateIcon(
+        aBigIcon, false, mozilla::LayoutDeviceIntPoint(),
+        nsWindowGfx::GetIconMetrics(nsWindowGfx::kRegularIcon), &hIcon);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    window->SetBigIcon(hIcon);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::SetWindowIconFromExe(mozIDOMWindowProxy* aWindow,
+                                     const nsAString& aExe, uint16_t aIndex) {
+  NS_ENSURE_ARG(aWindow);
+
+  nsCOMPtr<nsIWidget> widget =
+      nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
+  nsWindow* window = static_cast<nsWindow*>(widget.get());
+
+  HICON icon = ::LoadIconW(::GetModuleHandleW(PromiseFlatString(aExe).get()),
+                           MAKEINTRESOURCEW(aIndex));
+  window->SetBigIcon(icon);
+  window->SetSmallIcon(icon);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::SetWindowIconNoData(mozIDOMWindowProxy* aWindow) {
+  NS_ENSURE_ARG(aWindow);
+
+  nsCOMPtr<nsIWidget> widget =
+      nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
+  nsWindow* window = static_cast<nsWindow*>(widget.get());
+
+  window->SetSmallIconNoData();
+  window->SetBigIconNoData();
+
+  return NS_OK;
+}
+
+bool WindowsUIUtils::GetInTabletMode() {
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
+  if (sInTabletModeState == TabletModeState::Unknown) {
+    UpdateInTabletMode();
+  }
+  return sInTabletModeState == TabletModeState::On;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::GetInTabletMode(bool* aResult) {
+  *aResult = GetInTabletMode();
+  return NS_OK;
+}
+
+static IInspectable* GetUISettings() {
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
+#ifndef __MINGW32__
+  // We need to keep this alive for ~ever so that change callbacks work as
+  // expected, sigh.
+  static StaticRefPtr<IInspectable> sUiSettingsAsInspectable;
+
+  if (!IsWin10OrLater()) {
+    // Windows.UI.ViewManagement.UISettings is Win10+ only.
+    return nullptr;
+  }
+
+  if (!sUiSettingsAsInspectable) {
+    ComPtr<IInspectable> uiSettingsAsInspectable;
+    ::RoActivateInstance(
+        HStringReference(RuntimeClass_Windows_UI_ViewManagement_UISettings)
+            .Get(),
+        &uiSettingsAsInspectable);
+    if (NS_WARN_IF(!uiSettingsAsInspectable)) {
+      return nullptr;
+    }
+
+    ComPtr<IUISettings5> uiSettings5;
+    if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings5))) {
+      EventRegistrationToken unusedToken;
+      auto callback = Callback<ITypedEventHandler<
+          UISettings*, UISettingsAutoHideScrollBarsChangedEventArgs*>>(
+          [](auto...) {
+            // Scrollbar sizes change layout.
+            LookAndFeel::NotifyChangedAllWindows(
+                widget::ThemeChangeKind::StyleAndLayout);
+            return S_OK;
+          });
+      (void)NS_WARN_IF(FAILED(uiSettings5->add_AutoHideScrollBarsChanged(
+          callback.Get(), &unusedToken)));
+    }
+
+    ComPtr<IUISettings2> uiSettings2;
+    if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings2))) {
+      EventRegistrationToken unusedToken;
+      auto callback =
+          Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
+            // Text scale factor changes style and layout.
+            LookAndFeel::NotifyChangedAllWindows(
+                widget::ThemeChangeKind::StyleAndLayout);
+            return S_OK;
+          });
+      (void)NS_WARN_IF(FAILED(uiSettings2->add_TextScaleFactorChanged(
+          callback.Get(), &unusedToken)));
+    }
+
+    ComPtr<IUISettings3> uiSettings3;
+    if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings3))) {
+      EventRegistrationToken unusedToken;
+      auto callback =
+          Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
+            // System color changes change style only.
+            LookAndFeel::NotifyChangedAllWindows(
+                widget::ThemeChangeKind::Style);
+            return S_OK;
+          });
+      (void)NS_WARN_IF(FAILED(
+          uiSettings3->add_ColorValuesChanged(callback.Get(), &unusedToken)));
+    }
+
+    ComPtr<IUISettings4> uiSettings4;
+    if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings4))) {
+      EventRegistrationToken unusedToken;
+      auto callback =
+          Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
+            // Transparent effects changes change media queries only.
+            LookAndFeel::NotifyChangedAllWindows(
+                widget::ThemeChangeKind::MediaQueriesOnly);
+            return S_OK;
+          });
+      (void)NS_WARN_IF(FAILED(uiSettings4->add_AdvancedEffectsEnabledChanged(
+          callback.Get(), &unusedToken)));
+    }
+
+    sUiSettingsAsInspectable = dont_AddRef(uiSettingsAsInspectable.Detach());
+    ClearOnShutdown(&sUiSettingsAsInspectable);
+  }
+
+  return sUiSettingsAsInspectable.get();
+#else
+  return nullptr;
+#endif
+}
+
+Maybe<nscolor> WindowsUIUtils::GetAccentColor(int aTone) {
+  MOZ_ASSERT(aTone >= -3);
+  MOZ_ASSERT(aTone <= 3);
+#ifndef __MINGW32__
+  ComPtr<IInspectable> settings = GetUISettings();
+  if (NS_WARN_IF(!settings)) {
+    return Nothing();
+  }
+  ComPtr<IUISettings3> uiSettings3;
+  if (NS_WARN_IF(FAILED(settings.As(&uiSettings3)))) {
+    return Nothing();
+  }
+  Color color;
+  auto colorType = UIColorType(int(UIColorType_Accent) + aTone);
+  if (NS_WARN_IF(FAILED(uiSettings3->GetColorValue(colorType, &color)))) {
+    return Nothing();
+  }
+  return Some(NS_RGBA(color.R, color.G, color.B, color.A));
+#else
+  return Nothing();
+#endif
+}
+
+Maybe<nscolor> WindowsUIUtils::GetSystemColor(ColorScheme aScheme,
+                                              int aSysColor) {
+#ifndef __MINGW32__
+  if (!StaticPrefs::widget_windows_uwp_system_colors_enabled()) {
+    return Nothing();
+  }
+
+  // https://docs.microsoft.com/en-us/windows/apps/design/style/color
+  // Is a useful resource to see which values have decent contrast.
+  if (StaticPrefs::widget_windows_uwp_system_colors_highlight_accent()) {
+    if (aSysColor == COLOR_HIGHLIGHT) {
+      int tone = aScheme == ColorScheme::Light ? 0 : -1;
+      if (auto c = GetAccentColor(tone)) {
+        return c;
+      }
+    }
+    if (aSysColor == COLOR_HIGHLIGHTTEXT && GetAccentColor()) {
+      return Some(NS_RGBA(255, 255, 255, 255));
+    }
+  }
+
+  if (aScheme == ColorScheme::Dark) {
+    // There are no explicitly dark colors in UWP, other than the highlight
+    // colors above.
+    return Nothing();
+  }
+
+  auto knownType = [&]() -> Maybe<UIElementType> {
+#  define MAP(_win32, _uwp) \
+    case COLOR_##_win32:    \
+      return Some(UIElementType_##_uwp)
+    switch (aSysColor) {
+      MAP(HIGHLIGHT, Highlight);
+      MAP(HIGHLIGHTTEXT, HighlightText);
+      MAP(ACTIVECAPTION, ActiveCaption);
+      MAP(BTNFACE, ButtonFace);
+      MAP(BTNTEXT, ButtonText);
+      MAP(CAPTIONTEXT, CaptionText);
+      MAP(GRAYTEXT, GrayText);
+      MAP(HOTLIGHT, Hotlight);
+      MAP(INACTIVECAPTION, InactiveCaption);
+      MAP(INACTIVECAPTIONTEXT, InactiveCaptionText);
+      MAP(WINDOW, Window);
+      MAP(WINDOWTEXT, WindowText);
+      default:
+        return Nothing();
+    }
+#  undef MAP
+  }();
+  if (!knownType) {
+    return Nothing();
+  }
+  ComPtr<IInspectable> settings = GetUISettings();
+  if (NS_WARN_IF(!settings)) {
+    return Nothing();
+  }
+  ComPtr<IUISettings> uiSettings;
+  if (NS_WARN_IF(FAILED(settings.As(&uiSettings)))) {
+    return Nothing();
+  }
+  Color color;
+  if (NS_WARN_IF(FAILED(uiSettings->UIElementColor(*knownType, &color)))) {
+    return Nothing();
+  }
+  return Some(NS_RGBA(color.R, color.G, color.B, color.A));
+#else
+  return Nothing();
+#endif
+}
+bool WindowsUIUtils::ComputeOverlayScrollbars() {
+#ifndef __MINGW32__
+  if (!IsWin11OrLater()) {
+    // While in theory Windows 10 supports overlay scrollbar settings, it's off
+    // by default and it's untested whether our Win10 scrollbar drawing code
+    // deals with it properly.
+    return false;
+  }
+  if (!StaticPrefs::widget_windows_overlay_scrollbars_enabled()) {
+    return false;
+  }
+  ComPtr<IInspectable> settings = GetUISettings();
+  if (NS_WARN_IF(!settings)) {
+    return false;
+  }
+  ComPtr<IUISettings5> uiSettings5;
+  if (NS_WARN_IF(FAILED(settings.As(&uiSettings5)))) {
+    return false;
+  }
+  boolean autoHide = false;
+  if (NS_WARN_IF(FAILED(uiSettings5->get_AutoHideScrollBars(&autoHide)))) {
+    return false;
+  }
+  return autoHide;
+#else
+  return false;
+#endif
+}
+
+double WindowsUIUtils::ComputeTextScaleFactor() {
+#ifndef __MINGW32__
+  ComPtr<IInspectable> settings = GetUISettings();
+  if (NS_WARN_IF(!settings)) {
+    return 1.0;
+  }
+  ComPtr<IUISettings2> uiSettings2;
+  if (NS_WARN_IF(FAILED(settings.As(&uiSettings2)))) {
+    return false;
+  }
+  double scaleFactor = 1.0;
+  if (NS_WARN_IF(FAILED(uiSettings2->get_TextScaleFactor(&scaleFactor)))) {
+    return 1.0;
+  }
+  return scaleFactor;
+#else
+  return 1.0;
+#endif
+}
+
+bool WindowsUIUtils::ComputeTransparencyEffects() {
+  constexpr bool kDefault = true;
+#ifndef __MINGW32__
+  ComPtr<IInspectable> settings = GetUISettings();
+  if (NS_WARN_IF(!settings)) {
+    return kDefault;
+  }
+  ComPtr<IUISettings4> uiSettings4;
+  if (NS_WARN_IF(FAILED(settings.As(&uiSettings4)))) {
+    return kDefault;
+  }
+  boolean transparencyEffects = kDefault;
+  if (NS_WARN_IF(FAILED(
+          uiSettings4->get_AdvancedEffectsEnabled(&transparencyEffects)))) {
+    return kDefault;
+  }
+  return transparencyEffects;
+#else
+  return kDefault;
+#endif
+}
+
+void WindowsUIUtils::UpdateInTabletMode() {
+#ifndef __MINGW32__
+  if (!IsWin10OrLater()) {
+    return;
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsIWindowMediator> winMediator(
+      do_GetService(NS_WINDOWMEDIATOR_CONTRACTID, &rv));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  nsCOMPtr<nsIWidget> widget;
+  nsCOMPtr<mozIDOMWindowProxy> navWin;
+
+  rv = winMediator->GetMostRecentWindow(u"navigator:browser",
+                                        getter_AddRefs(navWin));
+  if (NS_FAILED(rv) || !navWin) {
+    // Fall back to the hidden window
+    nsCOMPtr<nsIAppShellService> appShell(
+        do_GetService(NS_APPSHELLSERVICE_CONTRACTID));
+
+    rv = appShell->GetHiddenDOMWindow(getter_AddRefs(navWin));
+    if (NS_FAILED(rv) || !navWin) {
+      return;
+    }
+  }
+
+  nsPIDOMWindowOuter* win = nsPIDOMWindowOuter::From(navWin);
+  widget = widget::WidgetUtils::DOMWindowToWidget(win);
+
+  if (!widget) {
+    return;
+  }
+
+  HWND winPtr = (HWND)widget->GetNativeData(NS_NATIVE_WINDOW);
+  ComPtr<IUIViewSettingsInterop> uiViewSettingsInterop;
+
+  HRESULT hr = GetActivationFactory(
+      HStringReference(RuntimeClass_Windows_UI_ViewManagement_UIViewSettings)
+          .Get(),
+      &uiViewSettingsInterop);
+  if (FAILED(hr)) {
+    return;
+  }
+  ComPtr<IUIViewSettings> uiViewSettings;
+  hr = uiViewSettingsInterop->GetForWindow(winPtr,
+                                           IID_PPV_ARGS(&uiViewSettings));
+  if (FAILED(hr)) {
+    return;
+  }
+  UserInteractionMode mode;
+  hr = uiViewSettings->get_UserInteractionMode(&mode);
+  if (FAILED(hr)) {
+    return;
+  }
+
+  TabletModeState oldTabletModeState = sInTabletModeState;
+  sInTabletModeState = mode == UserInteractionMode_Touch ? TabletModeState::On
+                                                         : TabletModeState::Off;
+  if (sInTabletModeState != oldTabletModeState) {
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    observerService->NotifyObservers(nullptr, "tablet-mode-change",
+                                     sInTabletModeState == TabletModeState::On
+                                         ? u"tablet-mode"
+                                         : u"normal-mode");
+  }
+#endif
+}
+
+#ifndef __MINGW32__
+struct HStringDeleter {
+  using pointer = HSTRING;
+  void operator()(pointer aString) { WindowsDeleteString(aString); }
+};
+
+using HStringUniquePtr = UniquePtr<HSTRING, HStringDeleter>;
+
+Result<HStringUniquePtr, HRESULT> ConvertToWindowsString(
+    const nsAString& aStr) {
+  HSTRING rawStr;
+  HRESULT hr = WindowsCreateString(PromiseFlatString(aStr).get(), aStr.Length(),
+                                   &rawStr);
+  if (FAILED(hr)) {
+    return Err(hr);
+  }
+  return HStringUniquePtr(rawStr);
+}
+
+static Result<Ok, nsresult> RequestShare(
+    const std::function<HRESULT(IDataRequestedEventArgs* pArgs)>& aCallback) {
+  if (!IsWin10OrLater()) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  HWND hwnd = GetForegroundWindow();
+  if (!hwnd) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  ComPtr<IDataTransferManagerInterop> dtmInterop;
+  ComPtr<IDataTransferManager> dtm;
+
+  HRESULT hr = RoGetActivationFactory(
+      HStringReference(
+          RuntimeClass_Windows_ApplicationModel_DataTransfer_DataTransferManager)
+          .Get(),
+      IID_PPV_ARGS(&dtmInterop));
+  if (FAILED(hr) ||
+      FAILED(dtmInterop->GetForWindow(hwnd, IID_PPV_ARGS(&dtm)))) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  auto callback = Callback<
+      ITypedEventHandler<DataTransferManager*, DataRequestedEventArgs*>>(
+      [aCallback](IDataTransferManager*,
+                  IDataRequestedEventArgs* pArgs) -> HRESULT {
+        return aCallback(pArgs);
+      });
+
+  EventRegistrationToken dataRequestedToken;
+  if (FAILED(dtm->add_DataRequested(callback.Get(), &dataRequestedToken)) ||
+      FAILED(dtmInterop->ShowShareUIForWindow(hwnd))) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  return Ok();
+}
+
+static Result<Ok, nsresult> AddShareEventListeners(
+    const RefPtr<mozilla::media::Refcountable<MozPromiseHolder<SharePromise>>>&
+        aPromiseHolder,
+    const ComPtr<IDataPackage>& aDataPackage) {
+  ComPtr<IDataPackage3> spDataPackage3;
+
+  if (FAILED(aDataPackage.As(&spDataPackage3))) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  auto completedCallback =
+      Callback<ITypedEventHandler<DataPackage*, ShareCompletedEventArgs*>>(
+          [aPromiseHolder](IDataPackage*,
+                           IShareCompletedEventArgs*) -> HRESULT {
+            aPromiseHolder->Resolve(true, __func__);
+            return S_OK;
+          });
+
+  EventRegistrationToken dataRequestedToken;
+  if (FAILED(spDataPackage3->add_ShareCompleted(completedCallback.Get(),
+                                                &dataRequestedToken))) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  ComPtr<IDataPackage4> spDataPackage4;
+  if (SUCCEEDED(aDataPackage.As(&spDataPackage4))) {
+    // Use SharedCanceled API only on supported versions of Windows
+    // So that the older ones can still use ShareUrl()
+
+    auto canceledCallback =
+        Callback<ITypedEventHandler<DataPackage*, IInspectable*>>(
+            [aPromiseHolder](IDataPackage*, IInspectable*) -> HRESULT {
+              aPromiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+              return S_OK;
+            });
+
+    if (FAILED(spDataPackage4->add_ShareCanceled(canceledCallback.Get(),
+                                                 &dataRequestedToken))) {
+      return Err(NS_ERROR_FAILURE);
+    }
+  }
+
+  return Ok();
+}
+#endif
+
+RefPtr<SharePromise> WindowsUIUtils::Share(nsAutoString aTitle,
+                                           nsAutoString aText,
+                                           nsAutoString aUrl) {
+  auto promiseHolder = MakeRefPtr<
+      mozilla::media::Refcountable<MozPromiseHolder<SharePromise>>>();
+  RefPtr<SharePromise> promise = promiseHolder->Ensure(__func__);
+
+#ifndef __MINGW32__
+  auto result = RequestShare([promiseHolder, title = std::move(aTitle),
+                              text = std::move(aText), url = std::move(aUrl)](
+                                 IDataRequestedEventArgs* pArgs) {
+    ComPtr<IDataRequest> spDataRequest;
+    ComPtr<IDataPackage> spDataPackage;
+    ComPtr<IDataPackage2> spDataPackage2;
+    ComPtr<IDataPackagePropertySet> spDataPackageProperties;
+
+    if (FAILED(pArgs->get_Request(&spDataRequest)) ||
+        FAILED(spDataRequest->get_Data(&spDataPackage)) ||
+        FAILED(spDataPackage.As(&spDataPackage2)) ||
+        FAILED(spDataPackage->get_Properties(&spDataPackageProperties))) {
+      promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+      return E_FAIL;
+    }
+
+    /*
+     * Windows always requires a title, and an empty string does not work.
+     * Thus we trick the API by passing a whitespace when we have no title.
+     * https://docs.microsoft.com/en-us/windows/uwp/app-to-app/share-data
+     */
+    auto wTitle = ConvertToWindowsString((title.IsVoid() || title.Length() == 0)
+                                             ? nsAutoString(u" "_ns)
+                                             : title);
+    if (wTitle.isErr() ||
+        FAILED(spDataPackageProperties->put_Title(wTitle.unwrap().get()))) {
+      promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+      return E_FAIL;
+    }
+
+    // Assign even if empty, as Windows requires some data to share
+    auto wText = ConvertToWindowsString(text);
+    if (wText.isErr() || FAILED(spDataPackage->SetText(wText.unwrap().get()))) {
+      promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+      return E_FAIL;
+    }
+
+    if (!url.IsVoid()) {
+      auto wUrl = ConvertToWindowsString(url);
+      if (wUrl.isErr()) {
+        promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+        return wUrl.unwrapErr();
+      }
+
+      ComPtr<IUriRuntimeClassFactory> uriFactory;
+      ComPtr<IUriRuntimeClass> uri;
+
+      auto hr = GetActivationFactory(
+          HStringReference(RuntimeClass_Windows_Foundation_Uri).Get(),
+          &uriFactory);
+
+      if (FAILED(hr) ||
+          FAILED(uriFactory->CreateUri(wUrl.unwrap().get(), &uri)) ||
+          FAILED(spDataPackage2->SetWebLink(uri.Get()))) {
+        promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+        return E_FAIL;
+      }
+    }
+
+    if (!StaticPrefs::widget_windows_share_wait_action_enabled()) {
+      promiseHolder->Resolve(true, __func__);
+    } else if (AddShareEventListeners(promiseHolder, spDataPackage).isErr()) {
+      promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+      return E_FAIL;
+    }
+
+    return S_OK;
+  });
+  if (result.isErr()) {
+    promiseHolder->Reject(result.unwrapErr(), __func__);
+  }
+#else
+  promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
+#endif
+
+  return promise;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::ShareUrl(const nsAString& aUrlToShare,
+                         const nsAString& aShareTitle) {
+  nsAutoString text;
+  text.SetIsVoid(true);
+  WindowsUIUtils::Share(nsAutoString(aShareTitle), text,
+                        nsAutoString(aUrlToShare));
+  return NS_OK;
+}