winrt: Use native file dialog

The native Windows Runtime file picker is required to support picking
of any file/folder from the system. Due to platform security restrictions,
the non-native file dialog is effectively useless when outside of the
application's installation or local storage directories.

This adds a QPA implementation for the WinRT file picker, as well as
a simple file system engine to handle files which were opened by the
picker. This necessary for platform security reasons, as it is not
possible to open files from arbitrary paths - only file handles opened by
the picker can be used, so these are kept inside this file system engine
and acted upon when a known path is observed.

The file system engine is only instantiated when needed, and may prove
useful for other areas of Qt (such as known folders/standard paths) which
must operate on a virtual file rather than an absolute path.

Task-number: QTBUG-37748
Change-Id: Ia4fd6c5065ac92101ce34adcb6c9026fbcff56df
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@digia.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/src/plugins/platforms/winrt/qwinrtfiledialoghelper.h b/src/plugins/platforms/winrt/qwinrtfiledialoghelper.h
new file mode 100644
index 0000000000..f333f3f4ae
--- /dev/null
+++ b/src/plugins/platforms/winrt/qwinrtfiledialoghelper.h
@@ -0,0 +1,104 @@
+/****************************************************************************
+**
+** 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 QWINRTFILEDIALOGHELPER_H
+#define QWINRTFILEDIALOGHELPER_H
+
+#include <qpa/qplatformdialoghelper.h>
+#include <QtCore/qt_windows.h>
+
+struct IInspectable;
+namespace ABI {
+    namespace Windows {
+        namespace Storage {
+            class StorageFile;
+            class StorageFolder;
+            struct IStorageFile;
+        }
+        namespace Foundation {
+            enum class AsyncStatus;
+            template <typename T> struct IAsyncOperation;
+            namespace Collections {
+                template <typename T> struct IVectorView;
+            }
+        }
+    }
+}
+
+QT_BEGIN_NAMESPACE
+
+class QWinRTFileDialogHelperPrivate;
+class QWinRTFileDialogHelper : public QPlatformFileDialogHelper
+{
+    Q_OBJECT
+public:
+    explicit QWinRTFileDialogHelper();
+    ~QWinRTFileDialogHelper();
+
+    void exec() Q_DECL_OVERRIDE;
+    bool show(Qt::WindowFlags, Qt::WindowModality, QWindow *) Q_DECL_OVERRIDE;
+    void hide() Q_DECL_OVERRIDE;
+
+    bool defaultNameFilterDisables() const Q_DECL_OVERRIDE { return false; }
+    void setDirectory(const QUrl &directory) Q_DECL_OVERRIDE;
+    QUrl directory() const Q_DECL_OVERRIDE;
+    void selectFile(const QUrl &saveFileName);
+    QList<QUrl> selectedFiles() const Q_DECL_OVERRIDE;
+    void setFilter() Q_DECL_OVERRIDE { }
+    void selectNameFilter(const QString &selectedNameFilter) Q_DECL_OVERRIDE;
+    QString selectedNameFilter() const;
+
+private:
+    HRESULT onSingleFilePicked(ABI::Windows::Foundation::IAsyncOperation<ABI::Windows::Storage::StorageFile *> *,
+                               ABI::Windows::Foundation::AsyncStatus);
+    HRESULT onMultipleFilesPicked(ABI::Windows::Foundation::IAsyncOperation<ABI::Windows::Foundation::Collections::IVectorView<ABI::Windows::Storage::StorageFile *> *> *,
+                                  ABI::Windows::Foundation::AsyncStatus);
+    HRESULT onSingleFolderPicked(ABI::Windows::Foundation::IAsyncOperation<ABI::Windows::Storage::StorageFolder *> *,
+                                 ABI::Windows::Foundation::AsyncStatus);
+    void appendFile(IInspectable *);
+
+    QScopedPointer<QWinRTFileDialogHelperPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(QWinRTFileDialogHelper)
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINRTFILEDIALOGHELPER_H