Windows QPA: Detect Windows 10 tablet mode

Add new file for dynamically loading Window 10 Helpers via combase.dll
and add function qt_windowsIsTabletMode() querying
UIViewSettings::get_UserInteractionMode() for "Touch" mode.

The style hint QPlatformIntegration::ShowIsMaximized will then
reflect the tablet mode setting.

Task-number: QTBUG-56831
Change-Id: Ia361dd172fcf0e54fdfc70863c43527f3ea72fe2
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

5 files changed, 231 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwin10helpers.cpp b/src/plugins/platforms/windows/qwin10helpers.cpp
new file mode 100644
index 0000000000..3ded96b9d6
--- /dev/null
+++ b/src/plugins/platforms/windows/qwin10helpers.cpp
@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwin10helpers.h"
+
+#include <QtCore/QDebug>
+#include <QtCore/private/qsystemlibrary_p.h>
+
+#if defined(Q_CC_MINGW)
+#  define HAS_UI_VIEW_SETTINGS_INTEROP
+#elif !defined(Q_CC_MSVC) || _MSC_VER >= 1900 // MSVC2013 is lacking both
+#  define HAS_UI_VIEW_SETTINGS_INTEROP
+#  define HAS_UI_VIEW_SETTINGS
+#endif
+
+#include <inspectable.h>
+
+#ifdef HAS_UI_VIEW_SETTINGS
+#  include <windows.ui.viewmanagement.h>
+#endif
+
+#ifdef HAS_UI_VIEW_SETTINGS_INTEROP
+#  include <UIViewSettingsInterop.h>
+#endif
+
+#ifndef HAS_UI_VIEW_SETTINGS_INTEROP
+MIDL_INTERFACE("3694dbf9-8f68-44be-8ff5-195c98ede8a6")
+IUIViewSettingsInterop : public IInspectable
+{
+public:
+    virtual HRESULT STDMETHODCALLTYPE GetForWindow(
+        __RPC__in HWND hwnd,
+        __RPC__in REFIID riid,
+        __RPC__deref_out_opt void **ppv) = 0;
+};
+#endif // !HAS_UI_VIEW_SETTINGS_INTEROP
+
+#ifndef HAS_UI_VIEW_SETTINGS
+namespace ABI {
+namespace Windows {
+namespace UI {
+namespace ViewManagement {
+
+enum UserInteractionMode { Mouse, Touch };
+
+MIDL_INTERFACE("C63657F6-8850-470D-88F8-455E16EA2C26")
+IUIViewSettings : public IInspectable
+{
+public:
+    virtual HRESULT STDMETHODCALLTYPE get_UserInteractionMode(UserInteractionMode *value) = 0;
+};
+
+} // namespace ViewManagement
+} // namespace UI
+} // namespace Windows
+} // namespace ABI
+#endif // HAS_UI_VIEW_SETTINGS
+
+QT_BEGIN_NAMESPACE
+
+// Starting from Windows 10
+struct QWindowsComBaseDLL
+{
+    bool init();
+    bool isValid() const
+    {
+        return roGetActivationFactory != nullptr && windowsCreateStringReference != nullptr;
+    }
+
+    typedef HRESULT (WINAPI *RoGetActivationFactory)(HSTRING, REFIID, void **);
+    typedef HRESULT (WINAPI *WindowsCreateStringReference)(PCWSTR, UINT32, HSTRING_HEADER *, HSTRING *);
+
+    RoGetActivationFactory roGetActivationFactory = nullptr;
+    WindowsCreateStringReference windowsCreateStringReference = nullptr;
+};
+
+static QWindowsComBaseDLL baseComDll;
+
+bool QWindowsComBaseDLL::init()
+{
+    if (QSysInfo::windowsVersion() >= QSysInfo::WV_WINDOWS10 && !isValid()) {
+        QSystemLibrary library(QStringLiteral("combase"));
+        roGetActivationFactory =
+            reinterpret_cast<RoGetActivationFactory>(library.resolve("RoGetActivationFactory"));
+        windowsCreateStringReference =
+            reinterpret_cast<WindowsCreateStringReference>(library.resolve("WindowsCreateStringReference"));
+    }
+    return isValid();
+}
+
+// Return tablet mode, note: Does not work for GetDesktopWindow().
+bool qt_windowsIsTabletMode(HWND hwnd)
+{
+    bool result = false;
+
+    if (!baseComDll.init())
+        return false;
+
+    const wchar_t uiViewSettingsId[] = L"Windows.UI.ViewManagement.UIViewSettings";
+    HSTRING_HEADER uiViewSettingsIdRefHeader;
+    HSTRING uiViewSettingsIdHs = nullptr;
+    const UINT32 uiViewSettingsIdLen = UINT32(sizeof(uiViewSettingsId) / sizeof(uiViewSettingsId[0]) - 1);
+    if (FAILED(baseComDll.windowsCreateStringReference(uiViewSettingsId, uiViewSettingsIdLen, &uiViewSettingsIdRefHeader, &uiViewSettingsIdHs)))
+        return false;
+
+    IUIViewSettingsInterop *uiViewSettingsInterop = nullptr;
+    // __uuidof(IUIViewSettingsInterop);
+    const GUID uiViewSettingsInteropRefId = {0x3694dbf9, 0x8f68, 0x44be,{0x8f, 0xf5, 0x19, 0x5c, 0x98, 0xed, 0xe8, 0xa6}};
+
+    HRESULT hr = baseComDll.roGetActivationFactory(uiViewSettingsIdHs, uiViewSettingsInteropRefId,
+                                                   reinterpret_cast<void **>(&uiViewSettingsInterop));
+    if (FAILED(hr))
+        return false;
+
+    //  __uuidof(ABI::Windows::UI::ViewManagement::IUIViewSettings);
+    const GUID uiViewSettingsRefId = {0xc63657f6, 0x8850, 0x470d,{0x88, 0xf8, 0x45, 0x5e, 0x16, 0xea, 0x2c, 0x26}};
+    ABI::Windows::UI::ViewManagement::IUIViewSettings *viewSettings = nullptr;
+    hr = uiViewSettingsInterop->GetForWindow(hwnd, uiViewSettingsRefId,
+                                             reinterpret_cast<void **>(&viewSettings));
+    if (SUCCEEDED(hr)) {
+        ABI::Windows::UI::ViewManagement::UserInteractionMode currentMode;
+        hr = viewSettings->get_UserInteractionMode(&currentMode);
+        if (SUCCEEDED(hr))
+            result = currentMode == 1; // Touch, 1
+        viewSettings->Release();
+    }
+    uiViewSettingsInterop->Release();
+    return result;
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwin10helpers.h b/src/plugins/platforms/windows/qwin10helpers.h
new file mode 100644
index 0000000000..e1485003dd
--- /dev/null
+++ b/src/plugins/platforms/windows/qwin10helpers.h
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWIN10HELPERS_H
+#define QWIN10HELPERS_H
+
+#include <QtCore/QtGlobal>
+#include <QtCore/qt_windows.h>
+
+QT_BEGIN_NAMESPACE
+
+bool qt_windowsIsTabletMode(HWND hwnd);
+
+QT_END_NAMESPACE
+
+#endif // QWIN10HELPERS_H
diff --git a/src/plugins/platforms/windows/qwindowsclipboard.h b/src/plugins/platforms/windows/qwindowsclipboard.h
index 3fe0c74e78..992d34d492 100644
--- a/src/plugins/platforms/windows/qwindowsclipboard.h
+++ b/src/plugins/platforms/windows/qwindowsclipboard.h
@@ -73,6 +73,8 @@ public:
 
     static QWindowsClipboard *instance() { return m_instance; }
 
+    HWND clipboardViewer() const { return m_clipboardViewer; }
+
 private:
     void clear();
     void releaseIData();
diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 004b03d9a9..f49ad0e767 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -41,6 +41,7 @@
 #include "qwindowsintegration.h"
 #include "qwindowswindow.h"
 #include "qwindowscontext.h"
+#include "qwin10helpers.h"
 #include "qwindowsopenglcontext.h"
 
 #include "qwindowsscreen.h"
@@ -510,6 +511,12 @@ QVariant QWindowsIntegration::styleHint(QPlatformIntegration::StyleHint hint) co
     case KeyboardAutoRepeatRate:
         return QVariant(keyBoardAutoRepeatRateMS());
 #endif
+    case QPlatformIntegration::ShowIsMaximized:
+#ifndef QT_NO_CLIPBOARD
+        return qt_windowsIsTabletMode(d->m_clipboard.clipboardViewer());
+#else
+        break;
+#endif
     case QPlatformIntegration::StartDragTime:
     case QPlatformIntegration::StartDragDistance:
     case QPlatformIntegration::KeyboardInputInterval:
diff --git a/src/plugins/platforms/windows/windows.pri b/src/plugins/platforms/windows/windows.pri
index d97e49309f..20e0b81da9 100644
--- a/src/plugins/platforms/windows/windows.pri
+++ b/src/plugins/platforms/windows/windows.pri
@@ -25,7 +25,8 @@ SOURCES += \
     $$PWD/qwindowsdialoghelpers.cpp \
     $$PWD/qwindowsservices.cpp \
     $$PWD/qwindowsnativeinterface.cpp \
-    $$PWD/qwindowsopengltester.cpp
+    $$PWD/qwindowsopengltester.cpp \
+    $$PWD/qwin10helpers.cpp
 
 HEADERS += \
     $$PWD/qwindowswindow.h \
@@ -46,6 +47,7 @@ HEADERS += \
     $$PWD/qwindowsnativeinterface.h \
     $$PWD/qwindowsopengltester.h \
     $$PWD/qwindowsthreadpoolrunner.h
+    $$PWD/qwin10helpers.h
 
 INCLUDEPATH += $$PWD