Add QQuickPalette value type

Change-Id: Id4dfb4939d3ea720fe46a4a5171d3e068c8f1fd3
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

4 files changed, 253 insertions, 0 deletions

diff --git a/src/imports/templates/qquicktemplates2valuetypeprovider.cpp b/src/imports/templates/qquicktemplates2valuetypeprovider.cpp
new file mode 100644
index 00000000..6debdbc4
--- /dev/null
+++ b/src/imports/templates/qquicktemplates2valuetypeprovider.cpp
@@ -0,0 +1,159 @@
+/****************************************************************************
+**
+** 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 "qquicktemplates2valuetypeprovider_p.h"
+
+#include <QtQml/private/qqmlvaluetype_p.h>
+#include <QtQuickTemplates2/private/qquickpalette_p.h>
+
+QT_BEGIN_NAMESPACE
+
+#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 *QQuickTemplates2ValueTypeProvider::getMetaObjectForMetaType(int type)
+{
+    switch (type) {
+    case QMetaType::QPalette:
+        return &QQuickPalette::staticMetaObject;
+    default:
+        break;
+    }
+
+    return nullptr;
+}
+
+bool QQuickTemplates2ValueTypeProvider::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 QQuickTemplates2ValueTypeProvider::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 QQuickTemplates2ValueTypeProvider::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 QQuickTemplates2ValueTypeProvider::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 QQuickTemplates2ValueTypeProvider::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
diff --git a/src/imports/templates/qquicktemplates2valuetypeprovider_p.h b/src/imports/templates/qquicktemplates2valuetypeprovider_p.h
new file mode 100644
index 00000000..6b072029
--- /dev/null
+++ b/src/imports/templates/qquicktemplates2valuetypeprovider_p.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKTEMPLATES2VALUETYPEPROVIDER_P_H
+#define QQUICKTEMPLATES2VALUETYPEPROVIDER_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 <QtQml/private/qqmlglobal_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickTemplates2ValueTypeProvider : public QQmlValueTypeProvider
+{
+public:
+    const QMetaObject *getMetaObjectForMetaType(int type) override;
+    bool init(int type, QVariant& dst) override;
+    bool equal(int type, const void *lhs, const QVariant &rhs) override;
+    bool store(int type, const void *src, void *dst, size_t dstSize) override;
+    bool read(const QVariant &src, void *dst, int dstType) override;
+    bool write(int type, const void *src, QVariant& dst) override;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKTEMPLATES2VALUETYPEPROVIDER_P_H
diff --git a/src/imports/templates/qtquicktemplates2plugin.cpp b/src/imports/templates/qtquicktemplates2plugin.cpp
index eea54894..e9ff17c8 100644
--- a/src/imports/templates/qtquicktemplates2plugin.cpp
+++ b/src/imports/templates/qtquicktemplates2plugin.cpp
@@ -35,6 +35,7 @@
 ****************************************************************************/
 
 #include <QtQml/qqmlextensionplugin.h>
+#include <QtQml/private/qqmlglobal_p.h>
 
 #include <QtQuickTemplates2/private/qquickabstractbutton_p.h>
 #include <QtQuickTemplates2/private/qquickaction_p.h>
@@ -95,6 +96,8 @@
 #include <QtQuickTemplates2/private/qquicktumbler_p.h>
 #endif
 
+#include "qquicktemplates2valuetypeprovider_p.h"
+
 static inline void initResources()
 {
 #ifdef QT_STATIC
@@ -111,6 +114,22 @@ extern void qt_quick_set_shortcut_context_matcher(ShortcutContextMatcher matcher
 
 QT_BEGIN_NAMESPACE
 
+static QQmlValueTypeProvider *valueTypeProvider()
+{
+    static QQuickTemplates2ValueTypeProvider provider;
+    return &provider;
+}
+
+static void initProviders()
+{
+    QQml_addValueTypeProvider(valueTypeProvider());
+}
+
+static void cleanupProviders()
+{
+    QQml_removeValueTypeProvider(valueTypeProvider());
+}
+
 class QtQuickTemplates2Plugin: public QQmlExtensionPlugin
 {
     Q_OBJECT
@@ -131,6 +150,7 @@ private:
 QtQuickTemplates2Plugin::QtQuickTemplates2Plugin(QObject *parent) : QQmlExtensionPlugin(parent)
 {
     initResources();
+    initProviders();
 
 #if QT_CONFIG(shortcut)
     originalContextMatcher = qt_quick_shortcut_context_matcher();
@@ -140,6 +160,8 @@ QtQuickTemplates2Plugin::QtQuickTemplates2Plugin(QObject *parent) : QQmlExtensio
 
 QtQuickTemplates2Plugin::~QtQuickTemplates2Plugin()
 {
+    cleanupProviders();
+
 #if QT_CONFIG(shortcut)
     qt_quick_set_shortcut_context_matcher(originalContextMatcher);
 #endif
diff --git a/src/imports/templates/templates.pro b/src/imports/templates/templates.pro
index 9a95812b..4ff0a76e 100644
--- a/src/imports/templates/templates.pro
+++ b/src/imports/templates/templates.pro
@@ -10,7 +10,11 @@ DEFINES += QT_NO_CAST_TO_ASCII QT_NO_CAST_FROM_ASCII
 OTHER_FILES += \
     qmldir
 
+HEADERS += \
+    $$PWD/qquicktemplates2valuetypeprovider_p.h
+
 SOURCES += \
+    $$PWD/qquicktemplates2valuetypeprovider.cpp \
     $$PWD/qtquicktemplates2plugin.cpp
 
 CONFIG += no_cxx_module