Palette: fix value type provider

The static value type provider instance must be moved from the plugin
(libqtquicktemplates2plugin.so) to the library (libQt5QuickTemplates2.so)
to keep it alive when qmlClearTypeRegistrations() is called and the
plugin is unloaded. This fixes the warning that was being thrown a lot
in tst_qquickmenubar on macOS:

    QWARN  : tst_qquickmenubar::Default::UnknownTestFunc() QQml_removeValueTypeProvider: was asked to remove provider 0x117dc97f8 but it was not found

Change-Id: I4448e497672c834786af0132b6ed5f03c3931773
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 175 insertions, 0 deletions

diff --git a/src/quicktemplates2/qquickpaletteprovider.cpp b/src/quicktemplates2/qquickpaletteprovider.cpp
new file mode 100644
index 00000000..d925fcae
--- /dev/null
+++ b/src/quicktemplates2/qquickpaletteprovider.cpp
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Templates 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickpaletteprovider_p.h"
+#include "qquickpalette_p.h"
+
+#include <QtQml/private/qqmlvaluetype_p.h>
+
+QT_BEGIN_NAMESPACE
+
+static QQmlValueTypeProvider *instance()
+{
+    static QQuickPaletteProvider provider;
+    return &provider;
+}
+
+void QQuickPaletteProvider::init()
+{
+    QQml_addValueTypeProvider(instance());
+}
+
+void QQuickPaletteProvider::cleanup()
+{
+    QQml_removeValueTypeProvider(instance());
+}
+
+#if defined(QT_NO_DEBUG) && !defined(QT_FORCE_ASSERTS)
+    #define ASSERT_VALID_SIZE(size, min) Q_UNUSED(size)
+#else
+    #define ASSERT_VALID_SIZE(size, min) Q_ASSERT(size >= min)
+#endif
+
+const QMetaObject *QQuickPaletteProvider::getMetaObjectForMetaType(int type)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        return &QQuickPalette::staticMetaObject;
+    default:
+        break;
+    }
+
+    return nullptr;
+}
+
+bool QQuickPaletteProvider::init(int type, QVariant& dst)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        dst.setValue<QPalette>(QPalette());
+        return true;
+    default: break;
+    }
+
+    return false;
+}
+
+template<typename T>
+bool typedEqual(const void *lhs, const QVariant& rhs)
+{
+    return (*(reinterpret_cast<const T *>(lhs)) == rhs.value<T>());
+}
+
+bool QQuickPaletteProvider::equal(int type, const void *lhs, const QVariant &rhs)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        return typedEqual<QPalette>(lhs, rhs);
+    default: break;
+    }
+
+    return false;
+}
+
+template<typename T>
+bool typedStore(const void *src, void *dst, size_t dstSize)
+{
+    ASSERT_VALID_SIZE(dstSize, sizeof(T));
+    const T *srcT = reinterpret_cast<const T *>(src);
+    T *dstT = reinterpret_cast<T *>(dst);
+    new (dstT) T(*srcT);
+    return true;
+}
+
+bool QQuickPaletteProvider::store(int type, const void *src, void *dst, size_t dstSize)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        return typedStore<QPalette>(src, dst, dstSize);
+    default: break;
+    }
+
+    return false;
+}
+
+template<typename T>
+bool typedRead(const QVariant& src, int dstType, void *dst)
+{
+    T *dstT = reinterpret_cast<T *>(dst);
+    if (src.type() == static_cast<uint>(dstType)) {
+        *dstT = src.value<T>();
+    } else {
+        *dstT = T();
+    }
+    return true;
+}
+
+bool QQuickPaletteProvider::read(const QVariant &src, void *dst, int dstType)
+{
+    switch (dstType) {
+    case QMetaType::QPalette:
+        return typedRead<QPalette>(src, dstType, dst);
+    default: break;
+    }
+
+    return false;
+}
+
+template<typename T>
+bool typedWrite(const void *src, QVariant& dst)
+{
+    const T *srcT = reinterpret_cast<const T *>(src);
+    if (dst.value<T>() != *srcT) {
+        dst = *srcT;
+        return true;
+    }
+    return false;
+}
+
+bool QQuickPaletteProvider::write(int type, const void *src, QVariant& dst)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        return typedWrite<QPalette>(src, dst);
+    default: break;
+    }
+
+    return false;
+}
+
+#undef ASSERT_VALID_SIZE
+
+QT_END_NAMESPACE