path: root/src/declarative/util/qmlsetproperties.cpp

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#include "private/qobject_p.h"
#include "qmlopenmetaobject.h"
#include "qmlsetproperties.h"
#include <QtCore/qdebug.h>
#include <QtDeclarative/qmlinfo.h>
#include <private/qmlcustomparser_p.h>
#include <private/qmlparser_p.h>
#include <QtDeclarative/qmlexpression.h>
#include <QtDeclarative/qmlbindablevalue.h>

QT_BEGIN_NAMESPACE

/*!
    \qmlclass SetProperties QmlSetProperties
    \brief The SetProperties element describes new property values for a state.

    SetProperties is a convenience element for changing many properties on a single
    object. It allows you to specify the property names and values similar to how
    you normally would specify them for the actual item:

    \code
    SetProperties {
        target: myRect
        x: 52
        y: 300
        width: 48
    }
    \endcode

    \c target is a property of \c SetProperties, so if the property you want to change
    is named \e target you will have to use \l SetProperty instead. You should also 
    use \l SetProperty if you want to update the binding for a property, 
    as SetProperties does not support this.
*/

/*!
    \internal
    \class QmlSetProperties
    \brief The QmlSetProperties class describes new property values for a state.

    \ingroup group_states

    QmlSetProperties is a convenience class for changing many properties on a single
    object. It allows you to specify the property names and values similar to how
    you normally would specify them for the actual item:

    \code
    SetProperties {
        target: myRect
        x: 52
        y: 300
        width: 48
    }
    \endcode

    \c target is a property of \c SetProperties, so if the property you want to change
    is named \e target you will have to use QmlSetProperty instead. You should also use QmlSetProperty
    if you want to update the binding for a property, as QmlSetProperties does not support this.

    \sa QmlSetProperty
*/

/*!
    \qmlproperty Object SetProperties::target
    This property holds the object that the properties to change belong to
*/

/*!
    \property QmlSetProperties::target
    \brief the object that the properties to change belong to
*/
class QmlSetPropertiesPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QmlSetProperties)
public:
    QmlSetPropertiesPrivate() : object(0), decoded(true), restore(true), 
                                isExplicit(false) {}

    QObject *object;
    QByteArray data;
    bool decoded;
    void decode();

    bool restore;
    bool isExplicit;

    QList<QPair<QByteArray, QVariant> > properties;
    QList<QPair<QByteArray, QmlExpression *> > expressions;

    QmlMetaProperty property(const QByteArray &);
};

class QmlSetPropertiesParser : public QmlCustomParser
{
public:
    void compileList(QList<QPair<QByteArray, QVariant> > &list, const QByteArray &pre, const QmlCustomParserProperty &prop);

    virtual QByteArray compile(const QList<QmlCustomParserProperty> &, bool *ok);
    virtual void setCustomData(QObject *, const QByteArray &);
};

void 
QmlSetPropertiesParser::compileList(QList<QPair<QByteArray, QVariant> > &list, 
                                     const QByteArray &pre, 
                                     const QmlCustomParserProperty &prop)
{
    QByteArray propName = pre + prop.name();

    QList<QVariant> values = prop.assignedValues();
    for (int ii = 0; ii < values.count(); ++ii) {
        const QVariant &value = values.at(ii);

        if (value.userType() == qMetaTypeId<QmlCustomParserNode>()) {
            continue;
        } else if(value.userType() == qMetaTypeId<QmlCustomParserProperty>()) {

            QmlCustomParserProperty prop = 
                qvariant_cast<QmlCustomParserProperty>(value);
            QByteArray pre = propName + ".";
            compileList(list, pre, prop);

        } else {
            list << qMakePair(propName, value);
        }
    }
}

QByteArray 
QmlSetPropertiesParser::compile(const QList<QmlCustomParserProperty> &props, 
                                bool *ok)
{
    *ok = true;

    QList<QPair<QByteArray, QVariant> > data;
    for(int ii = 0; ii < props.count(); ++ii)
        compileList(data, QByteArray(), props.at(ii));

    QByteArray rv;
    QDataStream ds(&rv, QIODevice::WriteOnly);

    ds << data.count();
    for(int ii = 0; ii < data.count(); ++ii) {
        QmlParser::Variant v = qvariant_cast<QmlParser::Variant>(data.at(ii).second);
        QVariant var;
        bool isScript = v.isScript();
        switch(v.type()) {
        case QmlParser::Variant::Boolean:
            var = QVariant(v.asBoolean());
            break;
        case QmlParser::Variant::Number:
            var = QVariant(v.asNumber());
            break;
        case QmlParser::Variant::String:
            var = QVariant(v.asString());
            break;
        case QmlParser::Variant::Invalid:
        case QmlParser::Variant::Script:
            var = QVariant(v.asScript());
            break;
        }

        ds << data.at(ii).first << isScript << var;
    }

    return rv;
}

void QmlSetPropertiesPrivate::decode()
{
    Q_Q(QmlSetProperties);
    if (decoded)
        return;

    QDataStream ds(&data, QIODevice::ReadOnly);

    int count;
    ds >> count;
    for (int ii = 0; ii < count; ++ii) {
        QByteArray name;
        bool isScript;
        QVariant data;
        ds >> name;
        ds >> isScript;
        ds >> data;

        if (isScript) {
            QmlExpression *expression = new QmlExpression(qmlContext(q), data.toString(), object);
            expression->setTrackChange(false);
            expressions << qMakePair(name, expression);
        } else {
            properties << qMakePair(name, data);
        }
    }

    decoded = true;
    data.clear();
}

void QmlSetPropertiesParser::setCustomData(QObject *object, 
                                            const QByteArray &data)
{
    QmlSetPropertiesPrivate *p = 
        static_cast<QmlSetPropertiesPrivate *>(QObjectPrivate::get(object));
    p->data = data;
    p->decoded = false;
}

QmlSetProperties::QmlSetProperties()
: QmlStateOperation(*(new QmlSetPropertiesPrivate))
{
}

QmlSetProperties::~QmlSetProperties()
{
    Q_D(QmlSetProperties);
    for(int ii = 0; ii < d->expressions.count(); ++ii)
        delete d->expressions.at(ii).second;
}

QObject *QmlSetProperties::object() const
{
    Q_D(const QmlSetProperties);
    return d->object;
}

void QmlSetProperties::setObject(QObject *o)
{
    Q_D(QmlSetProperties);
    d->object = o;
}

bool QmlSetProperties::restoreEntryValues() const
{
    Q_D(const QmlSetProperties);
    return d->restore;
}

void QmlSetProperties::setRestoreEntryValues(bool v)
{
    Q_D(QmlSetProperties);
    d->restore = v;
}

QmlMetaProperty
QmlSetPropertiesPrivate::property(const QByteArray &property)
{
    Q_Q(QmlSetProperties);
    QmlMetaProperty prop = QmlMetaProperty::createProperty(object, QString::fromLatin1(property));
    if (!prop.isValid()) {
        qmlInfo(q) << "Cannot assign to non-existant property" << property;
        return QmlMetaProperty();
    } else if (!prop.isWritable()) {
        qmlInfo(q) << "Cannot assign to read-only property" << property;
        return QmlMetaProperty();
    }
    return prop;
}

QmlSetProperties::ActionList QmlSetProperties::actions()
{
    Q_D(QmlSetProperties);

    d->decode();

    ActionList list;

    for (int ii = 0; ii < d->properties.count(); ++ii) {

        QByteArray property = d->properties.at(ii).first;
        QmlMetaProperty prop = d->property(property);

        if (prop.isValid()) {
            Action a;
            a.restore = restoreEntryValues();
            a.property = prop;
            a.fromValue = a.property.read();
            a.toValue = d->properties.at(ii).second;
            a.specifiedObject = d->object;
            a.specifiedProperty = QString::fromLatin1(property);

            list << a;
        }
    }

    for (int ii = 0; ii < d->expressions.count(); ++ii) {

        QByteArray property = d->expressions.at(ii).first;
        QmlMetaProperty prop = d->property(property);

        if (prop.isValid()) {
            Action a;
            a.restore = restoreEntryValues();
            a.property = prop;
            a.fromValue = a.property.read();
            a.specifiedObject = d->object;
            a.specifiedProperty = QString::fromLatin1(property);

            if (d->isExplicit) {
                a.toValue = d->expressions.at(ii).second->value();
            } else {
                a.toBinding = new QmlBindableValue(d->expressions.at(ii).second->expression(), object(), qmlContext(this));
                a.toBinding->setTarget(prop);
            }

            list << a;
        }
    }

    return list;
}

bool QmlSetProperties::isExplicit() const
{
    Q_D(const QmlSetProperties);
    return d->isExplicit;
}

void QmlSetProperties::setIsExplicit(bool e)
{
    Q_D(QmlSetProperties);
    d->isExplicit = e;
}

QML_DEFINE_CUSTOM_TYPE(QmlSetProperties,SetProperties,QmlSetPropertiesParser)

QT_END_NAMESPACE