1 files changed, 182 insertions, 0 deletions
diff --git a/widget/windows/WindowsUIUtils.cpp b/widget/windows/WindowsUIUtils.cpp
new file mode 100644
index 000000000..223511859
--- /dev/null
+++ b/widget/windows/WindowsUIUtils.cpp
@@ -0,0 +1,182 @@
+/* -*- 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 "mozwrlbase.h"
+#include "nsServiceManagerUtils.h"
+
+#include "WindowsUIUtils.h"
+
+#include "nsIObserverService.h"
+#include "nsIBaseWindow.h"
+#include "nsIDocShell.h"
+#include "nsIAppShellService.h"
+#include "nsAppShellCID.h"
+#include "nsIXULWindow.h"
+#include "mozilla/Services.h"
+#include "mozilla/WindowsVersion.h"
+#include "nsString.h"
+#include "nsIWidget.h"
+
+/* mingw currently doesn't support windows.ui.viewmanagement.h, so we disable it until it's fixed. */
+#ifndef __MINGW32__
+
+#include <windows.ui.viewmanagement.h>
+
+#pragma comment(lib, "runtimeobject.lib")
+
+using namespace mozilla;
+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;
+
+/* 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
+        };
+      }
+    }
+  }
+}
+
+#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);
+      }
+    }
+  }
+}
+#endif
+
+#ifndef IUIViewSettingsInterop
+
+typedef interface IUIViewSettingsInterop IUIViewSettingsInterop;
+
+MIDL_INTERFACE("3694dbf9-8f68-44be-8ff5-195c98ede8a6")
+IUIViewSettingsInterop : public IInspectable
+{
+public:
+  virtual HRESULT STDMETHODCALLTYPE GetForWindow(HWND hwnd, REFIID riid, void **ppv) = 0;
+};
+#endif
+
+#endif
+
+WindowsUIUtils::WindowsUIUtils() :
+  mInTabletMode(eTabletModeUnknown)
+{
+}
+
+WindowsUIUtils::~WindowsUIUtils()
+{
+}
+
+/*
+ * Implement the nsISupports methods...
+ */
+NS_IMPL_ISUPPORTS(WindowsUIUtils,
+                  nsIWindowsUIUtils)
+
+NS_IMETHODIMP
+WindowsUIUtils::GetInTabletMode(bool* aResult)
+{
+  if (mInTabletMode == eTabletModeUnknown) {
+    UpdateTabletModeState();
+  }
+  *aResult = mInTabletMode == eTabletModeOn;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+WindowsUIUtils::UpdateTabletModeState()
+{
+#ifndef __MINGW32__
+  if (!IsWin10OrLater()) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIAppShellService> appShell(do_GetService(NS_APPSHELLSERVICE_CONTRACTID));
+  nsCOMPtr<nsIXULWindow> hiddenWindow;
+
+  nsresult rv = appShell->GetHiddenWindow(getter_AddRefs(hiddenWindow));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell;
+  rv = hiddenWindow->GetDocShell(getter_AddRefs(docShell));
+  if (NS_FAILED(rv) || !docShell) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIBaseWindow> baseWindow(do_QueryInterface(docShell));
+
+  if (!baseWindow)
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIWidget> widget;
+  baseWindow->GetMainWidget(getter_AddRefs(widget));
+
+  if (!widget)
+    return NS_ERROR_FAILURE;
+
+  HWND winPtr = (HWND)widget->GetNativeData(NS_NATIVE_WINDOW);
+  ComPtr<IUIViewSettingsInterop> uiViewSettingsInterop;
+
+  HRESULT hr = GetActivationFactory(
+      HStringReference(RuntimeClass_Windows_UI_ViewManagement_UIViewSettings).Get(),
+      &uiViewSettingsInterop);
+  if (SUCCEEDED(hr)) {
+    ComPtr<IUIViewSettings> uiViewSettings;
+    hr = uiViewSettingsInterop->GetForWindow(winPtr, IID_PPV_ARGS(&uiViewSettings));
+    if (SUCCEEDED(hr)) {
+      UserInteractionMode mode;
+      hr = uiViewSettings->get_UserInteractionMode(&mode);
+      if (SUCCEEDED(hr)) {
+        TabletModeState oldTabletModeState = mInTabletMode;
+        mInTabletMode = (mode == UserInteractionMode_Touch) ? eTabletModeOn : eTabletModeOff;
+        if (mInTabletMode != oldTabletModeState) {
+          nsCOMPtr<nsIObserverService> observerService =
+            mozilla::services::GetObserverService();
+          NS_NAMED_LITERAL_STRING(tabletMode, "tablet-mode");
+          NS_NAMED_LITERAL_STRING(normalMode, "normal-mode");
+          observerService->NotifyObservers(nullptr, "tablet-mode-change",
+            ((mInTabletMode == eTabletModeOn) ? tabletMode.get() : normalMode.get()));
+        }
+      }
+    }
+  }
+#endif
+
+  return NS_OK;
+}
+