winrt: Clean up platform message dialog helper

- Remove "Platform" from class name for consistency
- Use ComPtr and HRESULT checking where missing
- Use UICommand ID class to reduce callback complexity
- Use dialog completed callback to fix failed repeated dialog opening

These changes have been tested with the QtQuick.Dialogs message dialog
example, and all features appear to be working. Note that the WinRT
dialog supports a maximum of three buttons, though, and a warning is
printed if this number is exceeded.

Similarly to Android, the native hooks can be now be disabled by
using qputenv("QT_USE_WINRT_NATIVE_DIALOGS", "0").

Task-number: QTBUG-38115
Task-number: QTBUG-39868
Change-Id: I9943c7c11bd640790db68219cefdca1a680e96ec
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@digia.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/src/plugins/platforms/winrt/qwinrtmessagedialoghelper.h b/src/plugins/platforms/winrt/qwinrtmessagedialoghelper.h
new file mode 100644
index 0000000000..25199e569c
--- /dev/null
+++ b/src/plugins/platforms/winrt/qwinrtmessagedialoghelper.h
@@ -0,0 +1,90 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINRTMESSAGEDIALOGHELPER_H
+#define QWINRTMESSAGEDIALOGHELPER_H
+
+#include <qpa/qplatformdialoghelper.h>
+#include <QtCore/qt_windows.h>
+
+namespace ABI {
+    namespace Windows {
+        namespace UI {
+            namespace Popups {
+                struct IUICommand;
+            }
+        }
+        namespace Foundation {
+            enum class AsyncStatus;
+            template <typename T> struct IAsyncOperation;
+        }
+    }
+}
+
+QT_BEGIN_NAMESPACE
+
+class QWinRTTheme;
+
+class QWinRTMessageDialogHelperPrivate;
+class QWinRTMessageDialogHelper : public QPlatformMessageDialogHelper
+{
+    Q_OBJECT
+public:
+    explicit QWinRTMessageDialogHelper(const QWinRTTheme *theme);
+    ~QWinRTMessageDialogHelper();
+
+    void exec();
+    bool show(Qt::WindowFlags windowFlags,
+              Qt::WindowModality windowModality,
+              QWindow *parent);
+    void hide();
+
+private:
+    HRESULT onCompleted(ABI::Windows::Foundation::IAsyncOperation<ABI::Windows::UI::Popups::IUICommand *> *asyncInfo,
+                        ABI::Windows::Foundation::AsyncStatus status);
+
+    QScopedPointer<QWinRTMessageDialogHelperPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(QWinRTMessageDialogHelper)
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINRTMESSAGEDIALOGHELPER_H