widget/windows/WindowsUIUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include <windows.h>
   7 #include <winsdkver.h>
   8 #include <wrl.h>
   9
  10 #include "nsServiceManagerUtils.h"
  11
  12 #include "WindowsUIUtils.h"
  13
  14 #include "nsIObserverService.h"
  15 #include "nsIAppShellService.h"
  16 #include "nsAppShellCID.h"
  17 #include "mozilla/ClearOnShutdown.h"
  18 #include "mozilla/ResultVariant.h"
  19 #include "mozilla/Services.h"
  20 #include "mozilla/StaticPrefs_widget.h"
  21 #include "mozilla/WidgetUtils.h"
  22 #include "mozilla/WindowsVersion.h"
  23 #include "mozilla/LookAndFeel.h"
  24 #include "mozilla/ScopeExit.h"
  25 #include "mozilla/media/MediaUtils.h"
  26 #include "nsString.h"
  27 #include "nsIWidget.h"
  28 #include "nsIWindowMediator.h"
  29 #include "nsPIDOMWindow.h"
  30 #include "nsWindowGfx.h"
  31 #include "Units.h"
  32
  33 /* mingw currently doesn't support windows.ui.viewmanagement.h, so we disable it
  34  * until it's fixed. */
  35
  36 // See
  37 // https://github.com/tpn/winsdk-10/blob/master/Include/10.0.14393.0/winrt/windows.ui.viewmanagement.h
  38 // for the source of some of these definitions for older SDKs.
  39 #ifndef __MINGW32__
  40
  41 #  include <inspectable.h>
  42 #  include <roapi.h>
  43 #  include <windows.ui.viewmanagement.h>
  44
  45 #  pragma comment(lib, "runtimeobject.lib")
  46
  47 using namespace ABI::Windows::UI;
  48 using namespace ABI::Windows::UI::ViewManagement;
  49 using namespace Microsoft::WRL;
  50 using namespace Microsoft::WRL::Wrappers;
  51 using namespace ABI::Windows::Foundation;
  52 using namespace ABI::Windows::ApplicationModel::DataTransfer;
  53
  54 /* All of this is win10 stuff and we're compiling against win81 headers
  55  * for now, so we may need to do some legwork: */
  56 #  if WINVER_MAXVER < 0x0A00
  57 namespace ABI {
  58 namespace Windows {
  59 namespace UI {
  60 namespace ViewManagement {
  61 enum UserInteractionMode {
  62   UserInteractionMode_Mouse = 0,
  63   UserInteractionMode_Touch = 1
  64 };
  65 }
  66 }  // namespace UI
  67 }  // namespace Windows
  68 }  // namespace ABI
  69
  70 #  endif
  71
  72 #  ifndef RuntimeClass_Windows_UI_ViewManagement_UIViewSettings
  73 #    define RuntimeClass_Windows_UI_ViewManagement_UIViewSettings \
  74       L"Windows.UI.ViewManagement.UIViewSettings"
  75 #  endif
  76
  77 #  if WINVER_MAXVER < 0x0A00
  78 namespace ABI {
  79 namespace Windows {
  80 namespace UI {
  81 namespace ViewManagement {
  82 interface IUIViewSettings;
  83 MIDL_INTERFACE("C63657F6-8850-470D-88F8-455E16EA2C26")
  84 IUIViewSettings : public IInspectable {
  85  public:
  86   virtual HRESULT STDMETHODCALLTYPE get_UserInteractionMode(
  87       UserInteractionMode * value) = 0;
  88 };
  89
  90 extern const __declspec(selectany) IID& IID_IUIViewSettings =
  91     __uuidof(IUIViewSettings);
  92 }  // namespace ViewManagement
  93 }  // namespace UI
  94 }  // namespace Windows
  95 }  // namespace ABI
  96 #  endif
  97
  98 #  ifndef IUIViewSettingsInterop
  99
 100 using IUIViewSettingsInterop = interface IUIViewSettingsInterop;
 101
 102 MIDL_INTERFACE("3694dbf9-8f68-44be-8ff5-195c98ede8a6")
 103 IUIViewSettingsInterop : public IInspectable {
 104  public:
 105   virtual HRESULT STDMETHODCALLTYPE GetForWindow(HWND hwnd, REFIID riid,
 106                                                  void** ppv) = 0;
 107 };
 108 #  endif
 109
 110 #  ifndef __IDataTransferManagerInterop_INTERFACE_DEFINED__
 111 #    define __IDataTransferManagerInterop_INTERFACE_DEFINED__
 112
 113 using IDataTransferManagerInterop = interface IDataTransferManagerInterop;
 114
 115 MIDL_INTERFACE("3A3DCD6C-3EAB-43DC-BCDE-45671CE800C8")
 116 IDataTransferManagerInterop : public IUnknown {
 117  public:
 118   virtual HRESULT STDMETHODCALLTYPE GetForWindow(
 119       HWND appWindow, REFIID riid, void** dataTransferManager) = 0;
 120   virtual HRESULT STDMETHODCALLTYPE ShowShareUIForWindow(HWND appWindow) = 0;
 121 };
 122
 123 #  endif
 124
 125 #  if !defined( \
 126       ____x_ABI_CWindows_CApplicationModel_CDataTransfer_CIDataPackage4_INTERFACE_DEFINED__)
 127 #    define ____x_ABI_CWindows_CApplicationModel_CDataTransfer_CIDataPackage4_INTERFACE_DEFINED__
 128
 129 MIDL_INTERFACE("13a24ec8-9382-536f-852a-3045e1b29a3b")
 130 IDataPackage4 : public IInspectable {
 131  public:
 132   virtual HRESULT STDMETHODCALLTYPE add_ShareCanceled(
 133       __FITypedEventHandler_2_Windows__CApplicationModel__CDataTransfer__CDataPackage_IInspectable *
 134           handler,
 135       EventRegistrationToken * token) = 0;
 136   virtual HRESULT STDMETHODCALLTYPE remove_ShareCanceled(
 137       EventRegistrationToken token) = 0;
 138 };
 139
 140 #  endif
 141
 142 #  ifndef RuntimeClass_Windows_UI_ViewManagement_UISettings
 143 #    define RuntimeClass_Windows_UI_ViewManagement_UISettings \
 144       L"Windows.UI.ViewManagement.UISettings"
 145 #  endif
 146 #  if WINDOWS_FOUNDATION_UNIVERSALAPICONTRACT_VERSION < 0x80000
 147 namespace ABI {
 148 namespace Windows {
 149 namespace UI {
 150 namespace ViewManagement {
 151
 152 class UISettings;
 153 class UISettingsAutoHideScrollBarsChangedEventArgs;
 154 interface IUISettingsAutoHideScrollBarsChangedEventArgs;
 155 MIDL_INTERFACE("87afd4b2-9146-5f02-8f6b-06d454174c0f")
 156 IUISettingsAutoHideScrollBarsChangedEventArgs : public IInspectable{};
 157
 158 }  // namespace ViewManagement
 159 }  // namespace UI
 160 }  // namespace Windows
 161 }  // namespace ABI
 162
 163 namespace ABI {
 164 namespace Windows {
 165 namespace Foundation {
 166
 167 template <>
 168 struct __declspec(uuid("808aef30-2660-51b0-9c11-f75dd42006b4"))
 169     ITypedEventHandler<ABI::Windows::UI::ViewManagement::UISettings*,
 170                        ABI::Windows::UI::ViewManagement::
 171                            UISettingsAutoHideScrollBarsChangedEventArgs*>
 172     : ITypedEventHandler_impl<
 173           ABI::Windows::Foundation::Internal::AggregateType<
 174               ABI::Windows::UI::ViewManagement::UISettings*,
 175               ABI::Windows::UI::ViewManagement::IUISettings*>,
 176           ABI::Windows::Foundation::Internal::AggregateType<
 177               ABI::Windows::UI::ViewManagement::
 178                   UISettingsAutoHideScrollBarsChangedEventArgs*,
 179               ABI::Windows::UI::ViewManagement::
 180                   IUISettingsAutoHideScrollBarsChangedEventArgs*>> {
 181   static const wchar_t* z_get_rc_name_impl() {
 182     return L"Windows.Foundation.TypedEventHandler`2<Windows.UI.ViewManagement."
 183            L"UISettings, "
 184            L"Windows.UI.ViewManagement."
 185            L"UISettingsAutoHideScrollBarsChangedEventArgs>";
 186   }
 187 };
 188 // Define a typedef for the parameterized interface specialization's mangled
 189 // name. This allows code which uses the mangled name for the parameterized
 190 // interface to access the correct parameterized interface specialization.
 191 typedef ITypedEventHandler<ABI::Windows::UI::ViewManagement::UISettings*,
 192                            ABI::Windows::UI::ViewManagement::
 193                                UISettingsAutoHideScrollBarsChangedEventArgs*>
 194     __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs_t;
 195 #    define __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs \
 196       ABI::Windows::Foundation::                                                                                                                            \
 197           __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs_t
 198
 199 }  // namespace Foundation
 200 }  // namespace Windows
 201 }  // namespace ABI
 202
 203 namespace ABI {
 204 namespace Windows {
 205 namespace UI {
 206 namespace ViewManagement {
 207 class UISettings;
 208 class UISettingsAutoHideScrollBarsChangedEventArgs;
 209 interface IUISettings5;
 210 MIDL_INTERFACE("5349d588-0cb5-5f05-bd34-706b3231f0bd")
 211 IUISettings5 : public IInspectable {
 212  public:
 213   virtual HRESULT STDMETHODCALLTYPE get_AutoHideScrollBars(boolean * value) = 0;
 214   virtual HRESULT STDMETHODCALLTYPE add_AutoHideScrollBarsChanged(
 215       __FITypedEventHandler_2_Windows__CUI__CViewManagement__CUISettings_Windows__CUI__CViewManagement__CUISettingsAutoHideScrollBarsChangedEventArgs *
 216           handler,
 217       EventRegistrationToken * token) = 0;
 218   virtual HRESULT STDMETHODCALLTYPE remove_AutoHideScrollBarsChanged(
 219       EventRegistrationToken token) = 0;
 220 };
 221 }  // namespace ViewManagement
 222 }  // namespace UI
 223 }  // namespace Windows
 224 }  // namespace ABI
 225 #  endif
 226 #endif
 227
 228 using namespace mozilla;
 229
 230 enum class TabletModeState : uint8_t { Unknown, Off, On };
 231 static TabletModeState sInTabletModeState;
 232
 233 WindowsUIUtils::WindowsUIUtils() = default;
 234 WindowsUIUtils::~WindowsUIUtils() = default;
 235
 236 NS_IMPL_ISUPPORTS(WindowsUIUtils, nsIWindowsUIUtils)
 237
 238 NS_IMETHODIMP
 239 WindowsUIUtils::GetSystemSmallIconSize(int32_t* aSize) {
 240   NS_ENSURE_ARG(aSize);
 241
 242   mozilla::LayoutDeviceIntSize size =
 243       nsWindowGfx::GetIconMetrics(nsWindowGfx::kSmallIcon);
 244   *aSize = std::max(size.width, size.height);
 245   return NS_OK;
 246 }
 247
 248 NS_IMETHODIMP
 249 WindowsUIUtils::GetSystemLargeIconSize(int32_t* aSize) {
 250   NS_ENSURE_ARG(aSize);
 251
 252   mozilla::LayoutDeviceIntSize size =
 253       nsWindowGfx::GetIconMetrics(nsWindowGfx::kRegularIcon);
 254   *aSize = std::max(size.width, size.height);
 255   return NS_OK;
 256 }
 257
 258 NS_IMETHODIMP
 259 WindowsUIUtils::SetWindowIcon(mozIDOMWindowProxy* aWindow,
 260                               imgIContainer* aSmallIcon,
 261                               imgIContainer* aBigIcon) {
 262   NS_ENSURE_ARG(aWindow);
 263
 264   nsCOMPtr<nsIWidget> widget =
 265       nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
 266   nsWindow* window = static_cast<nsWindow*>(widget.get());
 267
 268   nsresult rv;
 269
 270   if (aSmallIcon) {
 271     HICON hIcon = nullptr;
 272     rv = nsWindowGfx::CreateIcon(
 273         aSmallIcon, false, mozilla::LayoutDeviceIntPoint(),
 274         nsWindowGfx::GetIconMetrics(nsWindowGfx::kSmallIcon), &hIcon);
 275     NS_ENSURE_SUCCESS(rv, rv);
 276
 277     window->SetSmallIcon(hIcon);
 278   }
 279
 280   if (aBigIcon) {
 281     HICON hIcon = nullptr;
 282     rv = nsWindowGfx::CreateIcon(
 283         aBigIcon, false, mozilla::LayoutDeviceIntPoint(),
 284         nsWindowGfx::GetIconMetrics(nsWindowGfx::kRegularIcon), &hIcon);
 285     NS_ENSURE_SUCCESS(rv, rv);
 286
 287     window->SetBigIcon(hIcon);
 288   }
 289
 290   return NS_OK;
 291 }
 292
 293 NS_IMETHODIMP
 294 WindowsUIUtils::SetWindowIconFromExe(mozIDOMWindowProxy* aWindow,
 295                                      const nsAString& aExe, uint16_t aIndex) {
 296   NS_ENSURE_ARG(aWindow);
 297
 298   nsCOMPtr<nsIWidget> widget =
 299       nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
 300   nsWindow* window = static_cast<nsWindow*>(widget.get());
 301
 302   HICON icon = ::LoadIconW(::GetModuleHandleW(PromiseFlatString(aExe).get()),
 303                            MAKEINTRESOURCEW(aIndex));
 304   window->SetBigIcon(icon);
 305   window->SetSmallIcon(icon);
 306
 307   return NS_OK;
 308 }
 309
 310 NS_IMETHODIMP
 311 WindowsUIUtils::SetWindowIconNoData(mozIDOMWindowProxy* aWindow) {
 312   NS_ENSURE_ARG(aWindow);
 313
 314   nsCOMPtr<nsIWidget> widget =
 315       nsGlobalWindowOuter::Cast(aWindow)->GetMainWidget();
 316   nsWindow* window = static_cast<nsWindow*>(widget.get());
 317
 318   window->SetSmallIconNoData();
 319   window->SetBigIconNoData();
 320
 321   return NS_OK;
 322 }
 323
 324 bool WindowsUIUtils::GetInTabletMode() {
 325   MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
 326   if (sInTabletModeState == TabletModeState::Unknown) {
 327     UpdateInTabletMode();
 328   }
 329   return sInTabletModeState == TabletModeState::On;
 330 }
 331
 332 NS_IMETHODIMP
 333 WindowsUIUtils::GetInTabletMode(bool* aResult) {
 334   *aResult = GetInTabletMode();
 335   return NS_OK;
 336 }
 337
 338 static IInspectable* GetUISettings() {
 339   MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
 340 #ifndef __MINGW32__
 341   // We need to keep this alive for ~ever so that change callbacks work as
 342   // expected, sigh.
 343   static StaticRefPtr<IInspectable> sUiSettingsAsInspectable;
 344
 345   if (!IsWin10OrLater()) {
 346     // Windows.UI.ViewManagement.UISettings is Win10+ only.
 347     return nullptr;
 348   }
 349
 350   if (!sUiSettingsAsInspectable) {
 351     ComPtr<IInspectable> uiSettingsAsInspectable;
 352     ::RoActivateInstance(
 353         HStringReference(RuntimeClass_Windows_UI_ViewManagement_UISettings)
 354             .Get(),
 355         &uiSettingsAsInspectable);
 356     if (NS_WARN_IF(!uiSettingsAsInspectable)) {
 357       return nullptr;
 358     }
 359
 360     ComPtr<IUISettings5> uiSettings5;
 361     if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings5))) {
 362       EventRegistrationToken unusedToken;
 363       auto callback = Callback<ITypedEventHandler<
 364           UISettings*, UISettingsAutoHideScrollBarsChangedEventArgs*>>(
 365           [](auto...) {
 366             // Scrollbar sizes change layout.
 367             LookAndFeel::NotifyChangedAllWindows(
 368                 widget::ThemeChangeKind::StyleAndLayout);
 369             return S_OK;
 370           });
 371       (void)NS_WARN_IF(FAILED(uiSettings5->add_AutoHideScrollBarsChanged(
 372           callback.Get(), &unusedToken)));
 373     }
 374
 375     ComPtr<IUISettings2> uiSettings2;
 376     if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings2))) {
 377       EventRegistrationToken unusedToken;
 378       auto callback =
 379           Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
 380             // Text scale factor changes style and layout.
 381             LookAndFeel::NotifyChangedAllWindows(
 382                 widget::ThemeChangeKind::StyleAndLayout);
 383             return S_OK;
 384           });
 385       (void)NS_WARN_IF(FAILED(uiSettings2->add_TextScaleFactorChanged(
 386           callback.Get(), &unusedToken)));
 387     }
 388
 389     ComPtr<IUISettings3> uiSettings3;
 390     if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings3))) {
 391       EventRegistrationToken unusedToken;
 392       auto callback =
 393           Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
 394             // System color changes change style only.
 395             LookAndFeel::NotifyChangedAllWindows(
 396                 widget::ThemeChangeKind::Style);
 397             return S_OK;
 398           });
 399       (void)NS_WARN_IF(FAILED(
 400           uiSettings3->add_ColorValuesChanged(callback.Get(), &unusedToken)));
 401     }
 402
 403     ComPtr<IUISettings4> uiSettings4;
 404     if (SUCCEEDED(uiSettingsAsInspectable.As(&uiSettings4))) {
 405       EventRegistrationToken unusedToken;
 406       auto callback =
 407           Callback<ITypedEventHandler<UISettings*, IInspectable*>>([](auto...) {
 408             // Transparent effects changes change media queries only.
 409             LookAndFeel::NotifyChangedAllWindows(
 410                 widget::ThemeChangeKind::MediaQueriesOnly);
 411             return S_OK;
 412           });
 413       (void)NS_WARN_IF(FAILED(uiSettings4->add_AdvancedEffectsEnabledChanged(
 414           callback.Get(), &unusedToken)));
 415     }
 416
 417     sUiSettingsAsInspectable = dont_AddRef(uiSettingsAsInspectable.Detach());
 418     ClearOnShutdown(&sUiSettingsAsInspectable);
 419   }
 420
 421   return sUiSettingsAsInspectable.get();
 422 #else
 423   return nullptr;
 424 #endif
 425 }
 426
 427 Maybe<nscolor> WindowsUIUtils::GetAccentColor(int aTone) {
 428   MOZ_ASSERT(aTone >= -3);
 429   MOZ_ASSERT(aTone <= 3);
 430 #ifndef __MINGW32__
 431   ComPtr<IInspectable> settings = GetUISettings();
 432   if (NS_WARN_IF(!settings)) {
 433     return Nothing();
 434   }
 435   ComPtr<IUISettings3> uiSettings3;
 436   if (NS_WARN_IF(FAILED(settings.As(&uiSettings3)))) {
 437     return Nothing();
 438   }
 439   Color color;
 440   auto colorType = UIColorType(int(UIColorType_Accent) + aTone);
 441   if (NS_WARN_IF(FAILED(uiSettings3->GetColorValue(colorType, &color)))) {
 442     return Nothing();
 443   }
 444   return Some(NS_RGBA(color.R, color.G, color.B, color.A));
 445 #else
 446   return Nothing();
 447 #endif
 448 }
 449
 450 Maybe<nscolor> WindowsUIUtils::GetSystemColor(ColorScheme aScheme,
 451                                               int aSysColor) {
 452 #ifndef __MINGW32__
 453   if (!StaticPrefs::widget_windows_uwp_system_colors_enabled()) {
 454     return Nothing();
 455   }
 456
 457   // https://docs.microsoft.com/en-us/windows/apps/design/style/color
 458   // Is a useful resource to see which values have decent contrast.
 459   if (StaticPrefs::widget_windows_uwp_system_colors_highlight_accent()) {
 460     if (aSysColor == COLOR_HIGHLIGHT) {
 461       int tone = aScheme == ColorScheme::Light ? 0 : -1;
 462       if (auto c = GetAccentColor(tone)) {
 463         return c;
 464       }
 465     }
 466     if (aSysColor == COLOR_HIGHLIGHTTEXT && GetAccentColor()) {
 467       return Some(NS_RGBA(255, 255, 255, 255));
 468     }
 469   }
 470
 471   if (aScheme == ColorScheme::Dark) {
 472     // There are no explicitly dark colors in UWP, other than the highlight
 473     // colors above.
 474     return Nothing();
 475   }
 476
 477   auto knownType = [&]() -> Maybe<UIElementType> {
 478 #  define MAP(_win32, _uwp) \
 479     case COLOR_##_win32:    \
 480       return Some(UIElementType_##_uwp)
 481     switch (aSysColor) {
 482       MAP(HIGHLIGHT, Highlight);
 483       MAP(HIGHLIGHTTEXT, HighlightText);
 484       MAP(ACTIVECAPTION, ActiveCaption);
 485       MAP(BTNFACE, ButtonFace);
 486       MAP(BTNTEXT, ButtonText);
 487       MAP(CAPTIONTEXT, CaptionText);
 488       MAP(GRAYTEXT, GrayText);
 489       MAP(HOTLIGHT, Hotlight);
 490       MAP(INACTIVECAPTION, InactiveCaption);
 491       MAP(INACTIVECAPTIONTEXT, InactiveCaptionText);
 492       MAP(WINDOW, Window);
 493       MAP(WINDOWTEXT, WindowText);
 494       default:
 495         return Nothing();
 496     }
 497 #  undef MAP
 498   }();
 499   if (!knownType) {
 500     return Nothing();
 501   }
 502   ComPtr<IInspectable> settings = GetUISettings();
 503   if (NS_WARN_IF(!settings)) {
 504     return Nothing();
 505   }
 506   ComPtr<IUISettings> uiSettings;
 507   if (NS_WARN_IF(FAILED(settings.As(&uiSettings)))) {
 508     return Nothing();
 509   }
 510   Color color;
 511   if (NS_WARN_IF(FAILED(uiSettings->UIElementColor(*knownType, &color)))) {
 512     return Nothing();
 513   }
 514   return Some(NS_RGBA(color.R, color.G, color.B, color.A));
 515 #else
 516   return Nothing();
 517 #endif
 518 }
 519 bool WindowsUIUtils::ComputeOverlayScrollbars() {
 520 #ifndef __MINGW32__
 521   if (!IsWin11OrLater()) {
 522     // While in theory Windows 10 supports overlay scrollbar settings, it's off
 523     // by default and it's untested whether our Win10 scrollbar drawing code
 524     // deals with it properly.
 525     return false;
 526   }
 527   if (!StaticPrefs::widget_windows_overlay_scrollbars_enabled()) {
 528     return false;
 529   }
 530   ComPtr<IInspectable> settings = GetUISettings();
 531   if (NS_WARN_IF(!settings)) {
 532     return false;
 533   }
 534   ComPtr<IUISettings5> uiSettings5;
 535   if (NS_WARN_IF(FAILED(settings.As(&uiSettings5)))) {
 536     return false;
 537   }
 538   boolean autoHide = false;
 539   if (NS_WARN_IF(FAILED(uiSettings5->get_AutoHideScrollBars(&autoHide)))) {
 540     return false;
 541   }
 542   return autoHide;
 543 #else
 544   return false;
 545 #endif
 546 }
 547
 548 double WindowsUIUtils::ComputeTextScaleFactor() {
 549 #ifndef __MINGW32__
 550   ComPtr<IInspectable> settings = GetUISettings();
 551   if (NS_WARN_IF(!settings)) {
 552     return 1.0;
 553   }
 554   ComPtr<IUISettings2> uiSettings2;
 555   if (NS_WARN_IF(FAILED(settings.As(&uiSettings2)))) {
 556     return false;
 557   }
 558   double scaleFactor = 1.0;
 559   if (NS_WARN_IF(FAILED(uiSettings2->get_TextScaleFactor(&scaleFactor)))) {
 560     return 1.0;
 561   }
 562   return scaleFactor;
 563 #else
 564   return 1.0;
 565 #endif
 566 }
 567
 568 bool WindowsUIUtils::ComputeTransparencyEffects() {
 569   constexpr bool kDefault = true;
 570 #ifndef __MINGW32__
 571   ComPtr<IInspectable> settings = GetUISettings();
 572   if (NS_WARN_IF(!settings)) {
 573     return kDefault;
 574   }
 575   ComPtr<IUISettings4> uiSettings4;
 576   if (NS_WARN_IF(FAILED(settings.As(&uiSettings4)))) {
 577     return kDefault;
 578   }
 579   boolean transparencyEffects = kDefault;
 580   if (NS_WARN_IF(FAILED(
 581           uiSettings4->get_AdvancedEffectsEnabled(&transparencyEffects)))) {
 582     return kDefault;
 583   }
 584   return transparencyEffects;
 585 #else
 586   return kDefault;
 587 #endif
 588 }
 589
 590 void WindowsUIUtils::UpdateInTabletMode() {
 591 #ifndef __MINGW32__
 592   if (!IsWin10OrLater()) {
 593     return;
 594   }
 595
 596   nsresult rv;
 597   nsCOMPtr<nsIWindowMediator> winMediator(
 598       do_GetService(NS_WINDOWMEDIATOR_CONTRACTID, &rv));
 599   if (NS_FAILED(rv)) {
 600     return;
 601   }
 602
 603   nsCOMPtr<nsIWidget> widget;
 604   nsCOMPtr<mozIDOMWindowProxy> navWin;
 605
 606   rv = winMediator->GetMostRecentWindow(u"navigator:browser",
 607                                         getter_AddRefs(navWin));
 608   if (NS_FAILED(rv) || !navWin) {
 609     // Fall back to the hidden window
 610     nsCOMPtr<nsIAppShellService> appShell(
 611         do_GetService(NS_APPSHELLSERVICE_CONTRACTID));
 612
 613     rv = appShell->GetHiddenDOMWindow(getter_AddRefs(navWin));
 614     if (NS_FAILED(rv) || !navWin) {
 615       return;
 616     }
 617   }
 618
 619   nsPIDOMWindowOuter* win = nsPIDOMWindowOuter::From(navWin);
 620   widget = widget::WidgetUtils::DOMWindowToWidget(win);
 621
 622   if (!widget) {
 623     return;
 624   }
 625
 626   HWND winPtr = (HWND)widget->GetNativeData(NS_NATIVE_WINDOW);
 627   ComPtr<IUIViewSettingsInterop> uiViewSettingsInterop;
 628
 629   HRESULT hr = GetActivationFactory(
 630       HStringReference(RuntimeClass_Windows_UI_ViewManagement_UIViewSettings)
 631           .Get(),
 632       &uiViewSettingsInterop);
 633   if (FAILED(hr)) {
 634     return;
 635   }
 636   ComPtr<IUIViewSettings> uiViewSettings;
 637   hr = uiViewSettingsInterop->GetForWindow(winPtr,
 638                                            IID_PPV_ARGS(&uiViewSettings));
 639   if (FAILED(hr)) {
 640     return;
 641   }
 642   UserInteractionMode mode;
 643   hr = uiViewSettings->get_UserInteractionMode(&mode);
 644   if (FAILED(hr)) {
 645     return;
 646   }
 647
 648   TabletModeState oldTabletModeState = sInTabletModeState;
 649   sInTabletModeState = mode == UserInteractionMode_Touch ? TabletModeState::On
 650                                                          : TabletModeState::Off;
 651   if (sInTabletModeState != oldTabletModeState) {
 652     nsCOMPtr<nsIObserverService> observerService =
 653         mozilla::services::GetObserverService();
 654     observerService->NotifyObservers(nullptr, "tablet-mode-change",
 655                                      sInTabletModeState == TabletModeState::On
 656                                          ? u"tablet-mode"
 657                                          : u"normal-mode");
 658   }
 659 #endif
 660 }
 661
 662 #ifndef __MINGW32__
 663 struct HStringDeleter {
 664   using pointer = HSTRING;
 665   void operator()(pointer aString) { WindowsDeleteString(aString); }
 666 };
 667
 668 using HStringUniquePtr = UniquePtr<HSTRING, HStringDeleter>;
 669
 670 Result<HStringUniquePtr, HRESULT> ConvertToWindowsString(
 671     const nsAString& aStr) {
 672   HSTRING rawStr;
 673   HRESULT hr = WindowsCreateString(PromiseFlatString(aStr).get(), aStr.Length(),
 674                                    &rawStr);
 675   if (FAILED(hr)) {
 676     return Err(hr);
 677   }
 678   return HStringUniquePtr(rawStr);
 679 }
 680
 681 static Result<Ok, nsresult> RequestShare(
 682     const std::function<HRESULT(IDataRequestedEventArgs* pArgs)>& aCallback) {
 683   if (!IsWin10OrLater()) {
 684     return Err(NS_ERROR_FAILURE);
 685   }
 686
 687   HWND hwnd = GetForegroundWindow();
 688   if (!hwnd) {
 689     return Err(NS_ERROR_FAILURE);
 690   }
 691
 692   ComPtr<IDataTransferManagerInterop> dtmInterop;
 693   ComPtr<IDataTransferManager> dtm;
 694
 695   HRESULT hr = RoGetActivationFactory(
 696       HStringReference(
 697           RuntimeClass_Windows_ApplicationModel_DataTransfer_DataTransferManager)
 698           .Get(),
 699       IID_PPV_ARGS(&dtmInterop));
 700   if (FAILED(hr) ||
 701       FAILED(dtmInterop->GetForWindow(hwnd, IID_PPV_ARGS(&dtm)))) {
 702     return Err(NS_ERROR_FAILURE);
 703   }
 704
 705   auto callback = Callback<
 706       ITypedEventHandler<DataTransferManager*, DataRequestedEventArgs*>>(
 707       [aCallback](IDataTransferManager*,
 708                   IDataRequestedEventArgs* pArgs) -> HRESULT {
 709         return aCallback(pArgs);
 710       });
 711
 712   EventRegistrationToken dataRequestedToken;
 713   if (FAILED(dtm->add_DataRequested(callback.Get(), &dataRequestedToken)) ||
 714       FAILED(dtmInterop->ShowShareUIForWindow(hwnd))) {
 715     return Err(NS_ERROR_FAILURE);
 716   }
 717
 718   return Ok();
 719 }
 720
 721 static Result<Ok, nsresult> AddShareEventListeners(
 722     const RefPtr<mozilla::media::Refcountable<MozPromiseHolder<SharePromise>>>&
 723         aPromiseHolder,
 724     const ComPtr<IDataPackage>& aDataPackage) {
 725   ComPtr<IDataPackage3> spDataPackage3;
 726
 727   if (FAILED(aDataPackage.As(&spDataPackage3))) {
 728     return Err(NS_ERROR_FAILURE);
 729   }
 730
 731   auto completedCallback =
 732       Callback<ITypedEventHandler<DataPackage*, ShareCompletedEventArgs*>>(
 733           [aPromiseHolder](IDataPackage*,
 734                            IShareCompletedEventArgs*) -> HRESULT {
 735             aPromiseHolder->Resolve(true, __func__);
 736             return S_OK;
 737           });
 738
 739   EventRegistrationToken dataRequestedToken;
 740   if (FAILED(spDataPackage3->add_ShareCompleted(completedCallback.Get(),
 741                                                 &dataRequestedToken))) {
 742     return Err(NS_ERROR_FAILURE);
 743   }
 744
 745   ComPtr<IDataPackage4> spDataPackage4;
 746   if (SUCCEEDED(aDataPackage.As(&spDataPackage4))) {
 747     // Use SharedCanceled API only on supported versions of Windows
 748     // So that the older ones can still use ShareUrl()
 749
 750     auto canceledCallback =
 751         Callback<ITypedEventHandler<DataPackage*, IInspectable*>>(
 752             [aPromiseHolder](IDataPackage*, IInspectable*) -> HRESULT {
 753               aPromiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 754               return S_OK;
 755             });
 756
 757     if (FAILED(spDataPackage4->add_ShareCanceled(canceledCallback.Get(),
 758                                                  &dataRequestedToken))) {
 759       return Err(NS_ERROR_FAILURE);
 760     }
 761   }
 762
 763   return Ok();
 764 }
 765 #endif
 766
 767 RefPtr<SharePromise> WindowsUIUtils::Share(nsAutoString aTitle,
 768                                            nsAutoString aText,
 769                                            nsAutoString aUrl) {
 770   auto promiseHolder = MakeRefPtr<
 771       mozilla::media::Refcountable<MozPromiseHolder<SharePromise>>>();
 772   RefPtr<SharePromise> promise = promiseHolder->Ensure(__func__);
 773
 774 #ifndef __MINGW32__
 775   auto result = RequestShare([promiseHolder, title = std::move(aTitle),
 776                               text = std::move(aText), url = std::move(aUrl)](
 777                                  IDataRequestedEventArgs* pArgs) {
 778     ComPtr<IDataRequest> spDataRequest;
 779     ComPtr<IDataPackage> spDataPackage;
 780     ComPtr<IDataPackage2> spDataPackage2;
 781     ComPtr<IDataPackagePropertySet> spDataPackageProperties;
 782
 783     if (FAILED(pArgs->get_Request(&spDataRequest)) ||
 784         FAILED(spDataRequest->get_Data(&spDataPackage)) ||
 785         FAILED(spDataPackage.As(&spDataPackage2)) ||
 786         FAILED(spDataPackage->get_Properties(&spDataPackageProperties))) {
 787       promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 788       return E_FAIL;
 789     }
 790
 791     /*
 792      * Windows always requires a title, and an empty string does not work.
 793      * Thus we trick the API by passing a whitespace when we have no title.
 794      * https://docs.microsoft.com/en-us/windows/uwp/app-to-app/share-data
 795      */
 796     auto wTitle = ConvertToWindowsString((title.IsVoid() || title.Length() == 0)
 797                                              ? nsAutoString(u" "_ns)
 798                                              : title);
 799     if (wTitle.isErr() ||
 800         FAILED(spDataPackageProperties->put_Title(wTitle.unwrap().get()))) {
 801       promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 802       return E_FAIL;
 803     }
 804
 805     // Assign even if empty, as Windows requires some data to share
 806     auto wText = ConvertToWindowsString(text);
 807     if (wText.isErr() || FAILED(spDataPackage->SetText(wText.unwrap().get()))) {
 808       promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 809       return E_FAIL;
 810     }
 811
 812     if (!url.IsVoid()) {
 813       auto wUrl = ConvertToWindowsString(url);
 814       if (wUrl.isErr()) {
 815         promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 816         return wUrl.unwrapErr();
 817       }
 818
 819       ComPtr<IUriRuntimeClassFactory> uriFactory;
 820       ComPtr<IUriRuntimeClass> uri;
 821
 822       auto hr = GetActivationFactory(
 823           HStringReference(RuntimeClass_Windows_Foundation_Uri).Get(),
 824           &uriFactory);
 825
 826       if (FAILED(hr) ||
 827           FAILED(uriFactory->CreateUri(wUrl.unwrap().get(), &uri)) ||
 828           FAILED(spDataPackage2->SetWebLink(uri.Get()))) {
 829         promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 830         return E_FAIL;
 831       }
 832     }
 833
 834     if (!StaticPrefs::widget_windows_share_wait_action_enabled()) {
 835       promiseHolder->Resolve(true, __func__);
 836     } else if (AddShareEventListeners(promiseHolder, spDataPackage).isErr()) {
 837       promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 838       return E_FAIL;
 839     }
 840
 841     return S_OK;
 842   });
 843   if (result.isErr()) {
 844     promiseHolder->Reject(result.unwrapErr(), __func__);
 845   }
 846 #else
 847   promiseHolder->Reject(NS_ERROR_FAILURE, __func__);
 848 #endif
 849
 850   return promise;
 851 }
 852
 853 NS_IMETHODIMP
 854 WindowsUIUtils::ShareUrl(const nsAString& aUrlToShare,
 855                          const nsAString& aShareTitle) {
 856   nsAutoString text;
 857   text.SetIsVoid(true);
 858   WindowsUIUtils::Share(nsAutoString(aShareTitle), text,
 859                         nsAutoString(aUrlToShare));
 860   return NS_OK;
 861 }