Adding more DesignerSupport functions

The new functions/enablers are split into new classes.

* DesignerSupportItems
  Helper functions to tweak and create items.

* DesignerSupportProperties
  Helper functions to deal with properties and bindings.

* DesignerSupportPropertyChanges
  Helper functions to deal with PropertyChanges.

* DesignerSupportStates
  Helper functions to deal with States.

* DesignerSupportMetaInfo
  Two helper functions to deal with meta info and notication.

DesignerMetaObject is a specialized QQmlVMEMetaObject that implments
notification of property changes and allows to create dynamic properties.

DesignerCustomObjectData provides additional data for each Object. The
main functionality atm is to keep the default values and bindings for
properties, so they can be restored.

Change-Id: I6b6f501c8c5848d62bfcb7e704bc45662e731d54
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

1 files changed, 340 insertions, 0 deletions

diff --git a/src/quick/designer/qqmldesignermetaobject.cpp b/src/quick/designer/qqmldesignermetaobject.cpp
new file mode 100644
index 0000000000..4273c0fbc2
--- /dev/null
+++ b/src/quick/designer/qqmldesignermetaobject.cpp
@@ -0,0 +1,340 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qqmldesignermetaobject_p.h"
+
+#include <QSharedPointer>
+#include <QMetaProperty>
+#include <qnumeric.h>
+#include <QDebug>
+
+#include <private/qqmlengine_p.h>
+#include <private/qqmlpropertycache_p.h>
+
+QT_BEGIN_NAMESPACE
+
+static QHash<QDynamicMetaObjectData *, bool> nodeInstanceMetaObjectList;
+static void (*notifyPropertyChangeCallBack)(QObject*, const QQuickDesignerSupport::PropertyName &propertyName) = 0;
+
+struct MetaPropertyData {
+    inline QPair<QVariant, bool> &getDataRef(int idx) {
+        while (m_data.count() <= idx)
+            m_data << QPair<QVariant, bool>(QVariant(), false);
+        return m_data[idx];
+    }
+
+    inline QVariant &getData(int idx) {
+        QPair<QVariant, bool> &prop = getDataRef(idx);
+        if (!prop.second) {
+            prop.first = QVariant();
+            prop.second = true;
+        }
+        return prop.first;
+    }
+
+    inline bool hasData(int idx) const {
+        if (idx >= m_data.count())
+            return false;
+        return m_data[idx].second;
+    }
+
+    inline int count() { return m_data.count(); }
+
+    QVector<QPair<QVariant, bool> > m_data;
+};
+
+static bool constructedMetaData(const QQmlVMEMetaData* data)
+{
+    return data->varPropertyCount == 0
+            && data->propertyCount == 0
+            && data->aliasCount == 0
+            && data->signalCount == 0
+            && data->methodCount == 0;
+}
+
+static QQmlVMEMetaData* fakeMetaData()
+{
+    QQmlVMEMetaData* data = new QQmlVMEMetaData;
+    data->varPropertyCount = 0;
+    data->propertyCount = 0;
+    data->aliasCount = 0;
+    data->signalCount = 0;
+    data->methodCount = 0;
+
+    return data;
+}
+
+static const QQmlVMEMetaData* vMEMetaDataForObject(QObject *object)
+{
+    QQmlVMEMetaObject *metaObject = QQmlVMEMetaObject::get(object);
+    if (metaObject)
+        return metaObject->metaData;
+
+    return fakeMetaData();
+}
+
+static QQmlPropertyCache *cacheForObject(QObject *object, QQmlEngine *engine)
+{
+    QQmlVMEMetaObject *metaObject = QQmlVMEMetaObject::get(object);
+    if (metaObject)
+        return metaObject->cache;
+
+    return QQmlEnginePrivate::get(engine)->cache(object);
+}
+
+QQmlDesignerMetaObject* QQmlDesignerMetaObject::getNodeInstanceMetaObject(QObject *object, QQmlEngine *engine)
+{
+    //Avoid setting up multiple MetaObjects on the same QObject
+    QObjectPrivate *op = QObjectPrivate::get(object);
+    QDynamicMetaObjectData *parent = op->metaObject;
+    if (nodeInstanceMetaObjectList.contains(parent))
+        return static_cast<QQmlDesignerMetaObject *>(parent);
+
+    // we just create one and the ownership goes automatically to the object in nodeinstance see init method
+    return new QQmlDesignerMetaObject(object, engine);
+}
+
+void QQmlDesignerMetaObject::init(QObject *object, QQmlEngine *engine)
+{
+    //Creating QQmlOpenMetaObjectType
+    m_type = new QQmlOpenMetaObjectType(metaObjectParent(), engine);
+    m_type->addref();
+    //Assigning type to this
+    copyTypeMetaObject();
+
+    //Assign this to object
+    QObjectPrivate *op = QObjectPrivate::get(object);
+    op->metaObject = this;
+
+    //create cache
+    cache = m_cache = QQmlEnginePrivate::get(engine)->cache(this);
+    cache->addref();
+
+    //If our parent is not a VMEMetaObject we just se the flag to false again
+    if (constructedMetaData(metaData))
+        QQmlData::get(object)->hasVMEMetaObject = false;
+
+    nodeInstanceMetaObjectList.insert(this, true);
+    hasAssignedMetaObjectData = true;
+}
+
+QQmlDesignerMetaObject::QQmlDesignerMetaObject(QObject *object, QQmlEngine *engine)
+    : QQmlVMEMetaObject(object, cacheForObject(object, engine), vMEMetaDataForObject(object)),
+      m_context(engine->contextForObject(object)),
+      m_data(new MetaPropertyData),
+      m_cache(0)
+{
+    init(object, engine);
+
+    QQmlData *ddata = QQmlData::get(object, false);
+
+    //Assign cache to object
+    if (ddata && ddata->propertyCache) {
+        cache->setParent(ddata->propertyCache);
+        cache->invalidate(engine, this);
+        ddata->propertyCache = m_cache;
+    }
+
+}
+
+QQmlDesignerMetaObject::~QQmlDesignerMetaObject()
+{
+    if (cache->count() > 1) // qml is crashing because the property cache is not removed from the engine
+        cache->release();
+    else
+        m_type->release();
+
+    nodeInstanceMetaObjectList.remove(this);
+}
+
+void QQmlDesignerMetaObject::createNewDynamicProperty(const QString &name)
+{
+    int id = m_type->createProperty(name.toUtf8());
+    copyTypeMetaObject();
+    setValue(id, QVariant());
+    Q_ASSERT(id >= 0);
+    Q_UNUSED(id);
+
+    //Updating cache
+    QQmlPropertyCache *oldParent = m_cache->parent();
+    QQmlEnginePrivate::get(m_context->engine())->cache(this)->invalidate(m_context->engine(), this);
+    m_cache->setParent(oldParent);
+
+    QQmlProperty property(myObject(), name, m_context);
+    Q_ASSERT(property.isValid());
+}
+
+void QQmlDesignerMetaObject::setValue(int id, const QVariant &value)
+{
+    QPair<QVariant, bool> &prop = m_data->getDataRef(id);
+    prop.first = propertyWriteValue(id, value);
+    prop.second = true;
+    QMetaObject::activate(myObject(), id + m_type->signalOffset(), 0);
+}
+
+QVariant QQmlDesignerMetaObject::propertyWriteValue(int, const QVariant &value)
+{
+    return value;
+}
+
+const QAbstractDynamicMetaObject *QQmlDesignerMetaObject::dynamicMetaObjectParent() const
+{
+    if (QQmlVMEMetaObject::parent.isT1())
+        return QQmlVMEMetaObject::parent.asT1()->toDynamicMetaObject(QQmlVMEMetaObject::object);
+    else
+        return 0;
+}
+
+const QMetaObject *QQmlDesignerMetaObject::metaObjectParent() const
+{
+    if (QQmlVMEMetaObject::parent.isT1())
+        return QQmlVMEMetaObject::parent.asT1()->toDynamicMetaObject(QQmlVMEMetaObject::object);
+
+    return QQmlVMEMetaObject::parent.asT2();
+}
+
+int QQmlDesignerMetaObject::propertyOffset() const
+{
+    return cache->propertyOffset();
+}
+
+int QQmlDesignerMetaObject::openMetaCall(QMetaObject::Call call, int id, void **a)
+{
+    if ((call == QMetaObject::ReadProperty || call == QMetaObject::WriteProperty)
+            && id >= m_type->propertyOffset()) {
+        int propId = id - m_type->propertyOffset();
+        if (call == QMetaObject::ReadProperty) {
+            //propertyRead(propId);
+            *reinterpret_cast<QVariant *>(a[0]) = m_data->getData(propId);
+        } else if (call == QMetaObject::WriteProperty) {
+            if (propId <= m_data->count() || m_data->m_data[propId].first != *reinterpret_cast<QVariant *>(a[0]))  {
+                //propertyWrite(propId);
+                QPair<QVariant, bool> &prop = m_data->getDataRef(propId);
+                prop.first = propertyWriteValue(propId, *reinterpret_cast<QVariant *>(a[0]));
+                prop.second = true;
+                //propertyWritten(propId);
+                activate(myObject(), m_type->signalOffset() + propId, 0);
+            }
+        }
+        return -1;
+    } else {
+        QAbstractDynamicMetaObject *directParent = parent();
+        if (directParent)
+            return directParent->metaCall(call, id, a);
+        else
+            return myObject()->qt_metacall(call, id, a);
+    }
+}
+
+int QQmlDesignerMetaObject::metaCall(QMetaObject::Call call, int id, void **a)
+{
+    int metaCallReturnValue = -1;
+
+    const QMetaProperty propertyById = QQmlVMEMetaObject::property(id);
+
+    if (call == QMetaObject::WriteProperty
+            && propertyById.userType() == QMetaType::QVariant
+            && reinterpret_cast<QVariant *>(a[0])->type() == QVariant::Double
+            && qIsNaN(reinterpret_cast<QVariant *>(a[0])->toDouble())) {
+        return -1;
+    }
+
+    if (call == QMetaObject::WriteProperty
+            && propertyById.userType() == QMetaType::Double
+            && qIsNaN(*reinterpret_cast<double*>(a[0]))) {
+        return -1;
+    }
+
+    if (call == QMetaObject::WriteProperty
+            && propertyById.userType() == QMetaType::Float
+            && qIsNaN(*reinterpret_cast<float*>(a[0]))) {
+        return -1;
+    }
+
+    QVariant oldValue;
+
+    if (call == QMetaObject::WriteProperty && !propertyById.hasNotifySignal())
+    {
+        oldValue = propertyById.read(myObject());
+    }
+
+    QAbstractDynamicMetaObject *directParent = parent();
+    if (directParent && id < directParent->propertyOffset()) {
+        metaCallReturnValue = directParent->metaCall(call, id, a);
+    } else {
+        openMetaCall(call, id, a);
+    }
+
+
+    if (call == QMetaObject::WriteProperty
+            && !propertyById.hasNotifySignal()
+            && oldValue != propertyById.read(myObject()))
+        notifyPropertyChange(id);
+
+    return metaCallReturnValue;
+}
+
+void QQmlDesignerMetaObject::notifyPropertyChange(int id)
+{
+    const QMetaProperty propertyById = property(id);
+
+    if (id < propertyOffset()) {
+        if (notifyPropertyChangeCallBack)
+            notifyPropertyChangeCallBack(myObject(), propertyById.name());
+    } else {
+        if (notifyPropertyChangeCallBack)
+            notifyPropertyChangeCallBack(myObject(), name(id - propertyOffset()));
+    }
+}
+
+int QQmlDesignerMetaObject::count() const
+{
+    return m_type->propertyCount();
+}
+
+QByteArray QQmlDesignerMetaObject::name(int idx) const
+{
+    return m_type->propertyName(idx);
+}
+
+void QQmlDesignerMetaObject::copyTypeMetaObject()
+{
+    *static_cast<QMetaObject *>(this) = *m_type->metaObject();
+}
+
+void QQmlDesignerMetaObject::registerNotifyPropertyChangeCallBack(void (*callback)(QObject *, const QQuickDesignerSupport::PropertyName &))
+{
+    notifyPropertyChangeCallBack = callback;
+}
+
+QT_END_NAMESPACE