Init QQuickStyle's base URL to avoid creating temp QQmlEngine

Initialize the base URL from QtQuickControls2Plugin::registerTypes()
to avoid creating an unnecessary temporary instance of QQmlEngine. It
was used to list all known import paths, which were scanned for the
requested style folder. Now that we pass the base URL, the built-in
styles (a name without path to the style) can be looked up straight
from the base path.

Change-Id: I0d68d4c5bb90a4ab89660b5ce97f6433aeefc1ff
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/quickcontrols2/qquickstyle_p.h b/src/quickcontrols2/qquickstyle_p.h
new file mode 100644
index 00000000..594e71c8
--- /dev/null
+++ b/src/quickcontrols2/qquickstyle_p.h
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKSTYLE_P_H
+#define QQUICKSTYLE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qurl.h>
+#include <QtQuickControls2/private/qtquickcontrols2global_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_QUICKCONTROLS2_PRIVATE_EXPORT QQuickStylePrivate
+{
+public:
+    static void init(const QUrl &baseUrl);
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKSTYLE_P_H