Add support for Windows UI Automation

Replaces the Qt Accessibility Windows back end, formerly based on legacy
MSAA, with a new implementation based on UI Automation. Fixes issues with
accessibility tools like screen readers and magnifiers, and with the
automatic showing and hiding of the virtual keyboard in touchscreen-based
Windows computers.

[ChangeLog][Windows] The Windows Accessibility back end, formerly based on
Microsoft Active Accessibility, was replaced with a new implementation
based on Microsoft UI Automation.

Task-number: QTPM-487
Task-number: QTBUG-53024
Task-number: QTBUG-43190
Task-number: QTBUG-61926
Task-number: QTBUG-38499
Task-number: QTBUG-38337
Task-number: QTBUG-38501
Task-number: QTBUG-38502
Task-number: QTBUG-38504
Task-number: QTBUG-38505
Task-number: QTBUG-38507
Change-Id: I20b4f8f5e938fef791c6e9c577fcd919140999bd
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 105 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
new file mode 100644
index 0000000000..893cbf7f8a
--- /dev/null
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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 QWINDOWSUIAMAINPROVIDER_H
+#define QWINDOWSUIAMAINPROVIDER_H
+
+#include <QtCore/QtConfig>
+#ifndef QT_NO_ACCESSIBILITY
+
+#include "qwindowsuiabaseprovider.h"
+
+#include <QtCore/QPointer>
+#include <QtCore/QSharedPointer>
+#include <QtCore/qt_windows.h>
+#include <QtGui/QAccessible>
+
+QT_BEGIN_NAMESPACE
+
+// The main UI Automation class.
+class QWindowsUiaMainProvider :
+    public QWindowsUiaBaseProvider,
+    public IRawElementProviderSimple,
+    public IRawElementProviderFragment,
+    public IRawElementProviderFragmentRoot
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(QWindowsUiaMainProvider)
+public:
+    static QWindowsUiaMainProvider *providerForAccessible(QAccessibleInterface *accessible);
+    explicit QWindowsUiaMainProvider(QAccessibleInterface *a, int initialRefCount = 1);
+    virtual ~QWindowsUiaMainProvider();
+    static void notifyFocusChange(QAccessibleEvent *event);
+    static void notifyStateChange(QAccessibleStateChangeEvent *event);
+    static void notifyValueChange(QAccessibleValueChangeEvent *event);
+    static void notifyTextChange(QAccessibleEvent *event);
+
+    // IUnknown
+    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id, LPVOID *iface);
+    ULONG STDMETHODCALLTYPE AddRef();
+    ULONG STDMETHODCALLTYPE Release();
+
+    // IRawElementProviderSimple methods
+    HRESULT STDMETHODCALLTYPE get_ProviderOptions(ProviderOptions *pRetVal);
+    HRESULT STDMETHODCALLTYPE GetPatternProvider(PATTERNID idPattern, IUnknown **pRetVal);
+    HRESULT STDMETHODCALLTYPE GetPropertyValue(PROPERTYID idProp, VARIANT *pRetVal);
+    HRESULT STDMETHODCALLTYPE get_HostRawElementProvider(IRawElementProviderSimple **pRetVal);
+
+    // IRawElementProviderFragment methods
+    HRESULT STDMETHODCALLTYPE Navigate(NavigateDirection direction, IRawElementProviderFragment **pRetVal);
+    HRESULT STDMETHODCALLTYPE GetRuntimeId(SAFEARRAY **pRetVal);
+    HRESULT STDMETHODCALLTYPE get_BoundingRectangle(UiaRect *pRetVal);
+    HRESULT STDMETHODCALLTYPE GetEmbeddedFragmentRoots(SAFEARRAY **pRetVal);
+    HRESULT STDMETHODCALLTYPE SetFocus();
+    HRESULT STDMETHODCALLTYPE get_FragmentRoot(IRawElementProviderFragmentRoot **pRetVal);
+
+    // IRawElementProviderFragmentRoot methods
+    HRESULT STDMETHODCALLTYPE ElementProviderFromPoint(double x, double y, IRawElementProviderFragment **pRetVal);
+    HRESULT STDMETHODCALLTYPE GetFocus(IRawElementProviderFragment **pRetVal);
+
+private:
+    QString automationIdForAccessible(const QAccessibleInterface *accessible);
+    ULONG m_ref;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_ACCESSIBILITY
+
+#endif // QWINDOWSUIAMAINPROVIDER_H