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Diffstat (limited to 'src/qmlmodels/qqmllistaccessor.cpp')
| -rw-r--r-- | src/qmlmodels/qqmllistaccessor.cpp | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/src/qmlmodels/qqmllistaccessor.cpp b/src/qmlmodels/qqmllistaccessor.cpp new file mode 100644 index 0000000000..acf6a14e02 --- /dev/null +++ b/src/qmlmodels/qqmllistaccessor.cpp @@ -0,0 +1,271 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#include "qqmllistaccessor_p.h" + +#include <private/qqmlmetatype_p.h> + +#include <QtCore/qdebug.h> +#include <QtCore/qsequentialiterable.h> +#include <QtCore/qstringlist.h> +#include <QtCore/qurl.h> + +QT_BEGIN_NAMESPACE + +QQmlListAccessor::QQmlListAccessor() +: m_type(Invalid) +{ +} + +QQmlListAccessor::~QQmlListAccessor() +{ +} + +QVariant QQmlListAccessor::list() const +{ + return d; +} + +void QQmlListAccessor::setList(const QVariant &v) +{ + d = v; + + // An incoming JS array as model is treated as a variant list, so we need to + // convert it first with toVariant(). + QMetaType variantsType = d.metaType(); + if (variantsType == QMetaType::fromType<QJSValue>()) { + d = d.value<QJSValue>().toVariant(); + variantsType = d.metaType(); + } + + if (!d.isValid()) { + m_type = Invalid; + return; + } + + if (variantsType == QMetaType::fromType<QStringList>()) { + m_type = StringList; + return; + } + + if (variantsType == QMetaType::fromType<QList<QUrl>>()) { + m_type = UrlList; + return; + } + + if (variantsType == QMetaType::fromType<QVariantList>()) { + m_type = VariantList; + return; + } + + if (variantsType == QMetaType::fromType<QList<QObject *>>()) { + m_type = ObjectList; + return; + } + + if (variantsType.flags() & QMetaType::IsQmlList) { + d = QVariant::fromValue(QQmlListReference(d)); + m_type = ListProperty; + return; + } + + if (variantsType == QMetaType::fromType<QQmlListReference>()) { + m_type = ListProperty; + return; + } + + if (variantsType.flags() & QMetaType::PointerToQObject) { + m_type = Instance; + return; + } + + if (int i = 0; [&](){bool ok = false; i = v.toInt(&ok); return ok;}()) { + // 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; + + if (i < 0) { + qWarning("Model size of %d is less than 0", i); + m_type = Invalid; + return; + } + + if (i > upperLimit) { + qWarning("Model size of %d is bigger than the upper limit %d", i, upperLimit); + m_type = Invalid; + return; + } + + m_type = Integer; + d = i; + return; + } + + const QQmlType type = QQmlMetaType::qmlListType(variantsType); + if (type.isSequentialContainer()) { + m_metaSequence = type.listMetaSequence(); + m_type = Sequence; + return; + } + + QSequentialIterable iterable; + if (QMetaType::convert( + variantsType, d.constData(), + QMetaType::fromType<QSequentialIterable>(), &iterable)) { + const QMetaSequence sequence = iterable.metaContainer(); + + if (sequence.hasSize() && sequence.canGetValueAtIndex()) { + // If the resulting iterable is useful for anything, use it. + m_metaSequence = sequence; + m_type = Sequence; + return; + } + + if (sequence.hasConstIterator() && sequence.canGetValueAtConstIterator()) { + // As a last resort, try to read the contents of the container via an iterator + // and build a QVariantList from them. + QVariantList variantList; + for (auto it = iterable.constBegin(), end = iterable.constEnd(); it != end; ++it) + variantList.push_back(*it); + d = std::move(variantList); + m_type = VariantList; + return; + } + } + + m_type = Instance; + return; +} + +qsizetype QQmlListAccessor::count() const +{ + switch(m_type) { + case StringList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>()); + return reinterpret_cast<const QStringList *>(d.constData())->size(); + case UrlList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>()); + return reinterpret_cast<const QList<QUrl> *>(d.constData())->size(); + case VariantList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>()); + return reinterpret_cast<const QVariantList *>(d.constData())->size(); + case ObjectList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>()); + return reinterpret_cast<const QList<QObject *> *>(d.constData())->size(); + case ListProperty: + Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>()); + return reinterpret_cast<const QQmlListReference *>(d.constData())->count(); + case Sequence: + Q_ASSERT(m_metaSequence != QMetaSequence()); + return m_metaSequence.size(d.constData()); + case Instance: + return 1; + case Integer: + return *reinterpret_cast<const int *>(d.constData()); + case Invalid: + return 0; + } + Q_UNREACHABLE_RETURN(0); +} + +QVariant QQmlListAccessor::at(qsizetype idx) const +{ + Q_ASSERT(idx >= 0 && idx < count()); + switch(m_type) { + case StringList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>()); + return QVariant::fromValue(reinterpret_cast<const QStringList *>(d.constData())->at(idx)); + case UrlList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>()); + return QVariant::fromValue(reinterpret_cast<const QList<QUrl> *>(d.constData())->at(idx)); + case VariantList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>()); + return reinterpret_cast<const QVariantList *>(d.constData())->at(idx); + case ObjectList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>()); + return QVariant::fromValue(reinterpret_cast<const QList<QObject *> *>(d.constData())->at(idx)); + case ListProperty: + Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>()); + return QVariant::fromValue(reinterpret_cast<const QQmlListReference *>(d.constData())->at(idx)); + case Sequence: { + Q_ASSERT(m_metaSequence != QMetaSequence()); + QVariant result; + const QMetaType valueMetaType = m_metaSequence.valueMetaType(); + if (valueMetaType == QMetaType::fromType<QVariant>()) { + m_metaSequence.valueAtIndex(d.constData(), idx, &result); + } else { + result = QVariant(valueMetaType); + m_metaSequence.valueAtIndex(d.constData(), idx, result.data()); + } + return result; + } + case Instance: + return d; + case Integer: + return QVariant(idx); + case Invalid: + return QVariant(); + } + Q_UNREACHABLE_RETURN(QVariant()); +} + +void QQmlListAccessor::set(qsizetype idx, const QVariant &value) +{ + Q_ASSERT(idx >= 0 && idx < count()); + switch (m_type) { + case StringList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>()); + (*static_cast<QStringList *>(d.data()))[idx] = value.toString(); + break; + case UrlList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>()); + (*static_cast<QList<QUrl> *>(d.data()))[idx] = value.value<QUrl>(); + break; + case VariantList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>()); + (*static_cast<QVariantList *>(d.data()))[idx] = value; + break; + case ObjectList: + Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>()); + (*static_cast<QList<QObject *> *>(d.data()))[idx] = value.value<QObject *>(); + break; + case ListProperty: + Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>()); + static_cast<QQmlListReference *>(d.data())->replace(idx, value.value<QObject *>()); + break; + case Sequence: { + Q_ASSERT(m_metaSequence != QMetaSequence()); + const QMetaType valueMetaType = m_metaSequence.valueMetaType(); + if (valueMetaType == QMetaType::fromType<QVariant>()) { + m_metaSequence.setValueAtIndex(d.data(), idx, &value); + } else if (valueMetaType == value.metaType()) { + m_metaSequence.setValueAtIndex(d.data(), idx, value.constData()); + } else { + QVariant converted = value; + converted.convert(valueMetaType); + m_metaSequence.setValueAtIndex(d.data(), idx, converted.constData()); + } + break; + } + case Instance: + d = value; + break; + case Integer: + break;; + case Invalid: + break; + } +} + +bool QQmlListAccessor::isValid() const +{ + return m_type != Invalid; +} + +QT_END_NAMESPACE |