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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 417 insertions, 0 deletions

diff --git a/src/declarative/qml/qdeclarativelist.cpp b/src/declarative/qml/qdeclarativelist.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdeclarativelist.h"
+#include "private/qdeclarativelist_p.h"
+#include "private/qdeclarativeengine_p.h"
+#include "private/qdeclarativeproperty_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QDeclarativeListReferencePrivate::QDeclarativeListReferencePrivate()
+: propertyType(-1), refCount(1)
+{
+}
+
+QDeclarativeListReference QDeclarativeListReferencePrivate::init(const QDeclarativeListProperty<QObject> &prop, int propType, QDeclarativeEngine *engine)
+{
+    QDeclarativeListReference rv;
+
+    if (!prop.object) return rv;
+
+    QDeclarativeEnginePrivate *p = engine?QDeclarativeEnginePrivate::get(engine):0;
+
+    int listType = p?p->listType(propType):QDeclarativeMetaType::listType(propType);
+    if (listType == -1) return rv;
+
+    rv.d = new QDeclarativeListReferencePrivate;
+    rv.d->object = prop.object;
+    rv.d->elementType = p?p->rawMetaObjectForType(listType):QDeclarativeMetaType::qmlType(listType)->baseMetaObject();
+    rv.d->property = prop;
+    rv.d->propertyType = propType;
+
+    return rv;
+}
+
+void QDeclarativeListReferencePrivate::addref()
+{
+    Q_ASSERT(refCount > 0);
+    ++refCount;
+}
+
+void QDeclarativeListReferencePrivate::release()
+{
+    Q_ASSERT(refCount > 0);
+    --refCount;
+    if (!refCount)
+        delete this;
+}
+
+/*!
+\class QDeclarativeListReference
+\since 4.7
+\module QtDeclarative
+\brief The QDeclarativeListReference class allows the manipulation of QDeclarativeListProperty properties.
+
+QDeclarativeListReference allows C++ programs to read from, and assign values to a QML list property in a
+simple and type safe way.  A QDeclarativeListReference can be created by passing an object and property
+name or through a QDeclarativeProperty instance.  These two are equivalant:
+
+\code
+QDeclarativeListReference ref1(object, "children");
+
+QDeclarativeProperty ref2(object, "children");
+QDeclarativeListReference ref2 = qvariant_cast<QDeclarativeListReference>(ref2.read());
+\endcode
+
+Not all QML list properties support all operations.  A set of methods, canAppend(), canAt(), canClear() and
+canCount() allow programs to query whether an operation is supported on a given property.
+
+QML list properties are typesafe.  Only QObject's that derive from the correct base class can be assigned to
+the list.  The listElementType() method can be used to query the QMetaObject of the QObject type supported.
+Attempting to add objects of the incorrect type to a list property will fail.
+
+Like with normal lists, when accessing a list element by index, it is the callers responsibility to ensure 
+that it does not request an out of range element using the count() method before calling at().
+*/
+
+/*!
+Constructs an invalid instance.
+*/
+QDeclarativeListReference::QDeclarativeListReference()
+: d(0)
+{
+}
+
+/*!
+Constructs a QDeclarativeListReference for \a object's \a property.  If \a property is not a list
+property, an invalid QDeclarativeListReference is created.  If \a object is destroyed after 
+the reference is constructed, it will automatically become invalid.  That is, it is safe to hold
+QDeclarativeListReference instances even after \a object is deleted.
+
+Passing \a engine is required to access some QML created list properties.  If in doubt, and an engine
+is available, pass it.
+*/
+QDeclarativeListReference::QDeclarativeListReference(QObject *object, const char *property, QDeclarativeEngine *engine)
+: d(0)
+{
+    if (!object || !property) return;
+
+    QDeclarativePropertyCache::Data local;
+    QDeclarativePropertyCache::Data *data = 
+        QDeclarativePropertyCache::property(engine, object, QLatin1String(property), local);
+
+    if (!data || !(data->flags & QDeclarativePropertyCache::Data::IsQList)) return;
+
+    QDeclarativeEnginePrivate *p = engine?QDeclarativeEnginePrivate::get(engine):0;
+
+    int listType = p?p->listType(data->propType):QDeclarativeMetaType::listType(data->propType);
+    if (listType == -1) return;
+
+    d = new QDeclarativeListReferencePrivate;
+    d->object = object;
+    d->elementType = p?p->rawMetaObjectForType(listType):QDeclarativeMetaType::qmlType(listType)->baseMetaObject();
+    d->propertyType = data->propType;
+
+    void *args[] = { &d->property, 0 };
+    QMetaObject::metacall(object, QMetaObject::ReadProperty, data->coreIndex, args);
+}
+
+/*! \internal */
+QDeclarativeListReference::QDeclarativeListReference(const QDeclarativeListReference &o)
+: d(o.d)
+{
+    if (d) d->addref();
+}
+
+/*! \internal */
+QDeclarativeListReference &QDeclarativeListReference::operator=(const QDeclarativeListReference &o)
+{
+    if (o.d) o.d->addref();
+    if (d) d->release();
+    d = o.d;
+    return *this;
+}
+
+/*! \internal */
+QDeclarativeListReference::~QDeclarativeListReference()
+{
+    if (d) d->release();
+}
+
+/*!
+Returns true if the instance refers to a valid list property, otherwise false.
+*/
+bool QDeclarativeListReference::isValid() const
+{
+    return d && d->object;
+}
+
+/*!
+Returns the list property's object.  Returns 0 if the reference is invalid.
+*/
+QObject *QDeclarativeListReference::object() const
+{
+    if (isValid()) return d->object;
+    else return 0;
+}
+
+/*!
+Returns the QMetaObject for the elements stored in the list property.  Returns 0 if the reference
+is invalid.
+
+The QMetaObject can be used ahead of time to determine whether a given instance can be added
+to a list.
+*/
+const QMetaObject *QDeclarativeListReference::listElementType() const
+{
+    if (isValid()) return d->elementType;
+    else return 0;
+}
+
+/*!
+Returns true if the list property can be appended to, otherwise false.  Returns false if the
+reference is invalid.
+
+\sa append()
+*/
+bool QDeclarativeListReference::canAppend() const
+{
+    return (isValid() && d->property.append);
+}
+
+/*!
+Returns true if the list property can queried by index, otherwise false.  Returns false if the
+reference is invalid.
+
+\sa at()
+*/
+bool QDeclarativeListReference::canAt() const
+{
+    return (isValid() && d->property.at);
+}
+
+/*!
+Returns true if the list property can be cleared, otherwise false.  Returns false if the
+reference is invalid.
+
+\sa clear()
+*/
+bool QDeclarativeListReference::canClear() const
+{
+    return (isValid() && d->property.clear);
+}
+
+/*!
+Returns true if the list property can be queried for its element count, otherwise false.  
+Returns false if the reference is invalid.
+
+\sa count()
+*/
+bool QDeclarativeListReference::canCount() const
+{
+    return (isValid() && d->property.count);
+}
+
+/*!
+Appends \a object to the list.  Returns true if the operation succeeded, otherwise false.
+
+\sa canAppend()
+*/
+bool QDeclarativeListReference::append(QObject *object) const
+{
+    if (!canAppend()) return false;
+
+    if (object && !QDeclarativePropertyPrivate::canConvert(object->metaObject(), d->elementType))
+        return false;
+
+    d->property.append(&d->property, object);
+
+    return true;
+}
+
+/*!
+Returns the list element at \a index, or 0 if the operation failed.
+
+\sa canAt()
+*/
+QObject *QDeclarativeListReference::at(int index) const
+{
+    if (!canAt()) return 0;
+
+    return d->property.at(&d->property, index);
+}
+
+/*!
+Clears the list.  Returns true if the operation succeeded, otherwise false.
+
+\sa canClear()
+*/
+bool QDeclarativeListReference::clear() const
+{
+    if (!canClear()) return false;
+
+    d->property.clear(&d->property);
+
+    return true;
+}
+
+/*!
+Returns the number of objects in the list, or 0 if the operation failed.
+*/
+int QDeclarativeListReference::count() const
+{
+    if (!canCount()) return 0;
+
+    return d->property.count(&d->property);
+}
+
+/*!
+\class QDeclarativeListProperty
+\since 4.7
+\brief The QDeclarativeListProperty class allows applications to expose list-like 
+properties to QML.
+
+QML has many list properties, where more than one object value can be assigned.
+The use of a list property from QML looks like this:
+
+\code
+FruitBasket {
+    fruit: [ 
+        Apple {},
+        Orange{},
+        Banana{}
+    ]
+}
+\endcode
+
+The QDeclarativeListProperty encapsulates a group of function pointers that represet the
+set of actions QML can perform on the list - adding items, retrieving items and
+clearing the list.  In the future, additional operations may be supported.  All 
+list properties must implement the append operation, but the rest are optional.
+
+To provide a list property, a C++ class must implement the operation callbacks, 
+and then return an appropriate QDeclarativeListProperty value from the property getter.
+List properties should have no setter.  In the example above, the Q_PROPERTY()
+declarative will look like this:
+
+\code
+Q_PROPERTY(QDeclarativeListProperty<Fruit> fruit READ fruit);
+\endcode
+
+QML list properties are typesafe - in this case \c {Fruit} is a QObject type that 
+\c {Apple}, \c {Orange} and \c {Banana} all derive from.
+
+\note QDeclarativeListProperty can only be used for lists of QObject-derived object pointers.
+
+\sa {Object and List Property Types}
+
+*/
+
+/*!
+\fn QDeclarativeListProperty::QDeclarativeListProperty() 
+\internal
+*/
+
+/*!
+\fn QDeclarativeListProperty::QDeclarativeListProperty(QObject *object, QList<T *> &list)
+
+Convenience constructor for making a QDeclarativeListProperty value from an existing
+QList \a list.  The \a list reference must remain valid for as long as \a object
+exists.  \a object must be provided.
+
+Generally this constructor should not be used in production code, as a 
+writable QList violates QML's memory management rules.  However, this constructor
+can very useful while prototyping.
+*/
+
+/*!
+\fn QDeclarativeListProperty::QDeclarativeListProperty(QObject *object, void *data, AppendFunction append, 
+                                     CountFunction count = 0, AtFunction at = 0, 
+                                     ClearFunction clear = 0)
+
+Construct a QDeclarativeListProperty from a set of operation functions.  An opaque \a data handle
+may be passed which can be accessed from within the operation functions.  The list property 
+remains valid while \a object exists.
+
+The \a append operation is compulsory and must be provided, while the \a count, \a at and
+\a clear methods are optional.
+*/
+
+/*!
+\typedef QDeclarativeListProperty::AppendFunction
+
+Synonym for \c {void (*)(QDeclarativeListProperty<T> *property, T *value)}.
+
+Append the \a value to the list \a property.
+*/
+
+/*!
+\typedef QDeclarativeListProperty::CountFunction
+
+Synonym for \c {int (*)(QDeclarativeListProperty<T> *property)}.
+
+Return the number of elements in the list \a property.
+*/
+
+/*!
+\fn bool QDeclarativeListProperty::operator==(const QDeclarativeListProperty &other) const 
+
+Returns true if this QDeclarativeListProperty is equal to \a other, otherwise false.
+*/
+
+/*!
+\typedef QDeclarativeListProperty::AtFunction
+
+Synonym for \c {T *(*)(QDeclarativeListProperty<T> *property, int index)}.
+
+Return the element at position \a index in the list \a property.
+*/
+
+/*!
+\typedef QDeclarativeListProperty::ClearFunction
+
+Synonym for \c {void (*)(QDeclarativeListProperty<T> *property)}.
+
+Clear the list \a property.
+*/
+
+QT_END_NAMESPACE