| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtQml module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ** packaging of this file. Please review the following information to |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
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| ****************************************************************************/ |
| |
| #include "qqmllistaccessor_p.h" |
| |
| #include <private/qqmlmetatype_p.h> |
| |
| #include <QtCore/qstringlist.h> |
| #include <QtCore/qdebug.h> |
| |
| // ### Remove me |
| #include <private/qqmlengine_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QQmlListAccessor::QQmlListAccessor() |
| : m_type(Invalid) |
| { |
| } |
| |
| QQmlListAccessor::~QQmlListAccessor() |
| { |
| } |
| |
| QVariant QQmlListAccessor::list() const |
| { |
| return d; |
| } |
| |
| void QQmlListAccessor::setList(const QVariant &v, QQmlEngine *engine) |
| { |
| d = v; |
| |
| // An incoming JS array as model is treated as a variant list, so we need to |
| // convert it first with toVariant(). |
| if (d.userType() == qMetaTypeId<QJSValue>()) |
| d = d.value<QJSValue>().toVariant(); |
| |
| QQmlEnginePrivate *enginePrivate = engine?QQmlEnginePrivate::get(engine):nullptr; |
| |
| if (!d.isValid()) { |
| m_type = Invalid; |
| } else if (d.userType() == QVariant::StringList) { |
| m_type = StringList; |
| } else if (d.userType() == QMetaType::QVariantList) { |
| m_type = VariantList; |
| } else if (d.canConvert(QVariant::Int)) { |
| // Here we have to check for an upper limit, because down the line code might (well, will) |
| // allocate memory depending on the number of elements. The upper limit cannot be INT_MAX: |
| // QVector<QPointer<QQuickItem>> something; |
| // something.resize(count()); |
| // (See e.g. QQuickRepeater::regenerate()) |
| // This will allocate data along the lines of: |
| // sizeof(QPointer<QQuickItem>) * count() + QVector::headerSize |
| // So, doing an approximate round-down-to-nice-number, we get: |
| const int upperLimit = 100 * 1000 * 1000; |
| |
| int i = v.toInt(); |
| if (i < 0) { |
| qWarning("Model size of %d is less than 0", i); |
| m_type = Invalid; |
| } else if (i > upperLimit) { |
| qWarning("Model size of %d is bigger than the upper limit %d", i, upperLimit); |
| m_type = Invalid; |
| } else { |
| m_type = Integer; |
| } |
| } else if ((!enginePrivate && QQmlMetaType::isQObject(d.userType())) || |
| (enginePrivate && enginePrivate->isQObject(d.userType()))) { |
| QObject *data = enginePrivate?enginePrivate->toQObject(d):QQmlMetaType::toQObject(d); |
| d = QVariant::fromValue(data); |
| m_type = Instance; |
| } else if (d.userType() == qMetaTypeId<QQmlListReference>()) { |
| m_type = ListProperty; |
| } else { |
| m_type = Instance; |
| } |
| } |
| |
| int QQmlListAccessor::count() const |
| { |
| switch(m_type) { |
| case StringList: |
| return qvariant_cast<QStringList>(d).count(); |
| case VariantList: |
| return qvariant_cast<QVariantList>(d).count(); |
| case ListProperty: |
| return ((const QQmlListReference *)d.constData())->count(); |
| case Instance: |
| return 1; |
| case Integer: |
| return d.toInt(); |
| default: |
| case Invalid: |
| return 0; |
| } |
| } |
| |
| QVariant QQmlListAccessor::at(int idx) const |
| { |
| Q_ASSERT(idx >= 0 && idx < count()); |
| switch(m_type) { |
| case StringList: |
| return QVariant::fromValue(qvariant_cast<QStringList>(d).at(idx)); |
| case VariantList: |
| return qvariant_cast<QVariantList>(d).at(idx); |
| case ListProperty: |
| return QVariant::fromValue(((const QQmlListReference *)d.constData())->at(idx)); |
| case Instance: |
| return d; |
| case Integer: |
| return QVariant(idx); |
| default: |
| case Invalid: |
| return QVariant(); |
| } |
| } |
| |
| bool QQmlListAccessor::isValid() const |
| { |
| return m_type != Invalid; |
| } |
| |
| QT_END_NAMESPACE |