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// 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
#ifndef QQMLLIST_H
#define QQMLLIST_H
#include <QtQml/qtqmlglobal.h>
#include <QtCore/qcontainerinfo.h>
#include <QtCore/qlist.h>
#include <QtCore/qmetatype.h>
#include <QtCore/qvariant.h>
QT_BEGIN_NAMESPACE
class QObject;
struct QMetaObject;
#define QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_APPEND Q_CLASSINFO("QML.ListPropertyAssignBehavior", "Append")
#define QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_REPLACE_IF_NOT_DEFAULT Q_CLASSINFO("QML.ListPropertyAssignBehavior", "ReplaceIfNotDefault")
#define QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_REPLACE Q_CLASSINFO("QML.ListPropertyAssignBehavior", "Replace")
template<typename T>
class QQmlListProperty {
public:
using value_type = T*;
using AppendFunction = void (*)(QQmlListProperty<T> *, T *);
using CountFunction = qsizetype (*)(QQmlListProperty<T> *);
using AtFunction = T *(*)(QQmlListProperty<T> *, qsizetype);
using ClearFunction = void (*)(QQmlListProperty<T> *);
using ReplaceFunction = void (*)(QQmlListProperty<T> *, qsizetype, T *);
using RemoveLastFunction = void (*)(QQmlListProperty<T> *);
QQmlListProperty() = default;
QQmlListProperty(QObject *o, QList<T *> *list)
: object(o), data(list), append(qlist_append), count(qlist_count), at(qlist_at),
clear(qlist_clear), replace(qlist_replace), removeLast(qlist_removeLast)
{}
QQmlListProperty(QObject *o, void *d, AppendFunction a, CountFunction c, AtFunction t,
ClearFunction r )
: object(o),
data(d),
append(a),
count(c),
at(t),
clear(r),
replace((a && c && t && r) ? qslow_replace : nullptr),
removeLast((a && c && t && r) ? qslow_removeLast : nullptr)
{}
QQmlListProperty(QObject *o, void *d, AppendFunction a, CountFunction c, AtFunction t,
ClearFunction r, ReplaceFunction s, RemoveLastFunction p)
: object(o),
data(d),
append(a),
count(c),
at(t),
clear((!r && p && c) ? qslow_clear : r),
replace((!s && a && c && t && (r || p)) ? qslow_replace : s),
removeLast((!p && a && c && t && r) ? qslow_removeLast : p)
{}
QQmlListProperty(QObject *o, void *d, CountFunction c, AtFunction a)
: object(o), data(d), count(c), at(a)
{}
bool operator==(const QQmlListProperty &o) const {
return object == o.object &&
data == o.data &&
append == o.append &&
count == o.count &&
at == o.at &&
clear == o.clear &&
replace == o.replace &&
removeLast == o.removeLast;
}
QObject *object = nullptr;
void *data = nullptr;
AppendFunction append = nullptr;
CountFunction count = nullptr;
AtFunction at = nullptr;
ClearFunction clear = nullptr;
ReplaceFunction replace = nullptr;
RemoveLastFunction removeLast = nullptr;
template<typename List>
List toList()
{
if constexpr (std::is_same_v<List, QList<T *>>) {
if (append == qlist_append)
return *static_cast<QList<T *> *>(data);
}
const qsizetype size = count(this);
List result;
if constexpr (QContainerInfo::has_reserve_v<List>)
result.reserve(size);
static_assert(QContainerInfo::has_push_back_v<List>);
for (qsizetype i = 0; i < size; ++i)
result.push_back(at(this, i));
return result;
}
private:
static void qlist_append(QQmlListProperty *p, T *v) {
static_cast<QList<T *> *>(p->data)->append(v);
}
static qsizetype qlist_count(QQmlListProperty *p) {
return static_cast<QList<T *> *>(p->data)->size();
}
static T *qlist_at(QQmlListProperty *p, qsizetype idx) {
return static_cast<QList<T *> *>(p->data)->at(idx);
}
static void qlist_clear(QQmlListProperty *p) {
return static_cast<QList<T *> *>(p->data)->clear();
}
static void qlist_replace(QQmlListProperty *p, qsizetype idx, T *v) {
return static_cast<QList<T *> *>(p->data)->replace(idx, v);
}
static void qlist_removeLast(QQmlListProperty *p) {
return static_cast<QList<T *> *>(p->data)->removeLast();
}
static void qslow_replace(QQmlListProperty<T> *list, qsizetype idx, T *v)
{
const qsizetype length = list->count(list);
if (idx < 0 || idx >= length)
return;
QVector<T *> stash;
if (list->clear != qslow_clear) {
stash.reserve(length);
for (qsizetype i = 0; i < length; ++i)
stash.append(i == idx ? v : list->at(list, i));
list->clear(list);
for (T *item : std::as_const(stash))
list->append(list, item);
} else {
stash.reserve(length - idx - 1);
for (qsizetype i = length - 1; i > idx; --i) {
stash.append(list->at(list, i));
list->removeLast(list);
}
list->removeLast(list);
list->append(list, v);
while (!stash.isEmpty())
list->append(list, stash.takeLast());
}
}
static void qslow_clear(QQmlListProperty<T> *list)
{
for (qsizetype i = 0, end = list->count(list); i < end; ++i)
list->removeLast(list);
}
static void qslow_removeLast(QQmlListProperty<T> *list)
{
const qsizetype length = list->count(list) - 1;
if (length < 0)
return;
QVector<T *> stash;
stash.reserve(length);
for (qsizetype i = 0; i < length; ++i)
stash.append(list->at(list, i));
list->clear(list);
for (T *item : std::as_const(stash))
list->append(list, item);
}
};
class QQmlEngine;
class QQmlListReferencePrivate;
class Q_QML_EXPORT QQmlListReference
{
public:
QQmlListReference();
#if QT_DEPRECATED_SINCE(6, 4)
QT_DEPRECATED_X("Drop the QQmlEngine* argument")
QQmlListReference(const QVariant &variant, [[maybe_unused]] QQmlEngine *engine);
QT_DEPRECATED_X("Drop the QQmlEngine* argument")
QQmlListReference(QObject *o, const char *property, [[maybe_unused]] QQmlEngine *engine);
#endif
explicit QQmlListReference(const QVariant &variant);
QQmlListReference(QObject *o, const char *property);
QQmlListReference(const QQmlListReference &);
QQmlListReference &operator=(const QQmlListReference &);
~QQmlListReference();
bool isValid() const;
QObject *object() const;
const QMetaObject *listElementType() const;
bool canAppend() const;
bool canAt() const;
bool canClear() const;
bool canCount() const;
bool canReplace() const;
bool canRemoveLast() const;
bool isManipulable() const;
bool isReadable() const;
bool append(QObject *) const;
QObject *at(qsizetype) const;
bool clear() const;
qsizetype count() const;
qsizetype size() const { return count(); }
bool replace(qsizetype, QObject *) const;
bool removeLast() const;
bool operator==(const QQmlListReference &other) const {return d == other.d;}
private:
friend class QQmlListReferencePrivate;
QQmlListReferencePrivate* d;
};
namespace QtPrivate {
template<typename T>
inline constexpr bool IsQmlListType<QQmlListProperty<T>> = true;
}
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QQmlListReference)
#endif // QQMLLIST_H
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