Move binding and expression classes to separate files

Change-Id: Ia9c6996a606e140f31681ecd26d93b1b0fdedf02
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

1 files changed, 193 insertions, 0 deletions

diff --git a/src/qml/qml/qqmlabstractbinding.cpp b/src/qml/qml/qqmlabstractbinding.cpp
new file mode 100644
index 0000000000..11e4ed2ed8
--- /dev/null
+++ b/src/qml/qml/qqmlabstractbinding.cpp
@@ -0,0 +1,193 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qqmlabstractbinding_p.h"
+
+#include <private/qqmlbinding_p.h>
+#include <private/qqmlvaluetypeproxybinding_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQmlAbstractBinding::QQmlAbstractBinding()
+: m_prevBinding(0), m_nextBinding(0)
+{
+}
+
+QQmlAbstractBinding::~QQmlAbstractBinding()
+{
+    Q_ASSERT(m_prevBinding == 0);
+    Q_ASSERT(*m_mePtr == 0);
+}
+
+/*!
+Destroy the binding.  Use this instead of calling delete.
+
+Bindings are free to implement their own memory management, so the delete operator is not
+necessarily safe.  The default implementation clears the binding, removes it from the object
+and calls delete.
+*/
+void QQmlAbstractBinding::destroy()
+{
+    removeFromObject();
+    clear();
+
+    delete this;
+}
+
+/*!
+Add this binding to \a object.
+
+This transfers ownership of the binding to the object, marks the object's property as
+being bound.
+
+However, it does not enable the binding itself or call update() on it.
+*/
+void QQmlAbstractBinding::addToObject()
+{
+    Q_ASSERT(!m_prevBinding);
+
+    QObject *obj = object();
+    Q_ASSERT(obj);
+
+    int index = propertyIndex();
+
+    QQmlData *data = QQmlData::get(obj, true);
+
+    if (index & 0xFF000000) {
+        // Value type
+
+        int coreIndex = index & 0xFFFFFF;
+
+        // Find the value type proxy (if there is one)
+        QQmlValueTypeProxyBinding *proxy = 0;
+        if (data->hasBindingBit(coreIndex)) {
+            QQmlAbstractBinding *b = data->bindings;
+            while (b && b->propertyIndex() != coreIndex)
+                b = b->m_nextBinding;
+            Q_ASSERT(b && b->bindingType() == QQmlAbstractBinding::ValueTypeProxy);
+            proxy = static_cast<QQmlValueTypeProxyBinding *>(b);
+        }
+
+        if (!proxy) {
+            proxy = new QQmlValueTypeProxyBinding(obj, coreIndex);
+
+            Q_ASSERT(proxy->propertyIndex() == coreIndex);
+            Q_ASSERT(proxy->object() == obj);
+
+            proxy->addToObject();
+        }
+
+        m_nextBinding = proxy->m_bindings;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding;
+        m_prevBinding = &proxy->m_bindings;
+        proxy->m_bindings = this;
+
+    } else {
+        m_nextBinding = data->bindings;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding;
+        m_prevBinding = &data->bindings;
+        data->bindings = this;
+
+        data->setBindingBit(obj, index);
+    }
+}
+
+/*!
+Remove the binding from the object.
+*/
+void QQmlAbstractBinding::removeFromObject()
+{
+    if (m_prevBinding) {
+        int index = propertyIndex();
+
+        *m_prevBinding = m_nextBinding;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = m_prevBinding;
+        m_prevBinding = 0;
+        m_nextBinding = 0;
+
+        if (index & 0xFF000000) {
+            // Value type - we don't remove the proxy from the object.  It will sit their happily
+            // doing nothing until it is removed by a write, a binding change or it is reused
+            // to hold more sub-bindings.
+        } else if (QObject *obj = object()) {
+            QQmlData *data = QQmlData::get(obj, false);
+            if (data) data->clearBindingBit(index);
+        }
+    }
+}
+
+static void bindingDummyDeleter(QQmlAbstractBinding *)
+{
+}
+
+QQmlAbstractBinding::Pointer QQmlAbstractBinding::weakPointer()
+{
+    if (m_mePtr.value().isNull())
+        m_mePtr.value() = QSharedPointer<QQmlAbstractBinding>(this, bindingDummyDeleter);
+
+    return m_mePtr.value().toWeakRef();
+}
+
+void QQmlAbstractBinding::clear()
+{
+    if (!m_mePtr.isNull()) {
+        **m_mePtr = 0;
+        m_mePtr = 0;
+    }
+}
+
+void QQmlAbstractBinding::retargetBinding(QObject *, int)
+{
+    qFatal("QQmlAbstractBinding::retargetBinding() called on illegal binding.");
+}
+
+QString QQmlAbstractBinding::expression() const
+{
+    return QLatin1String("<Unknown>");
+}
+
+void QQmlAbstractBinding::setEnabled(bool enabled, QQmlPropertyPrivate::WriteFlags flags)
+{
+    if (enabled) update(flags);
+}
+
+
+QT_END_NAMESPACE