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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
**
****************************************************************************/
#include "qquickpackage_p.h"
#include <private/qobject_p.h>
#include <private/qqmlguard_p.h>
QT_BEGIN_NAMESPACE
/*!
\qmltype Package
\instantiates QQuickPackage
\inqmlmodule QtQml.Models
\ingroup qtquick-models
\brief Specifies a collection of named items.
The Package type is used in conjunction with
DelegateModel to enable delegates with a shared context
to be provided to multiple views.
Any item within a Package may be assigned a name via the
\l{Package::name}{Package.name} attached property.
The example below creates a Package containing two named items;
\e list and \e grid. The third item in the package (the \l Rectangle) is parented to whichever
delegate it should appear in. This allows an item to move
between views.
\snippet package/Delegate.qml 0
These named items are used as the delegates by the two views who
reference the special \l{DelegateModel::parts} property to select
a model which provides the chosen delegate.
\snippet package/view.qml 0
\note Package is part of QtQml.Models since version 2.14 and part of QtQuick since version 2.0.
Importing Package via QtQuick is deprecated since Qt 5.14.
\sa {Qt Quick Examples - Views}, {Qt Quick Demo - Photo Viewer}, {Qt QML}
*/
/*!
\qmlattachedproperty string QtQuick::Package::name
This attached property holds the name of an item within a Package.
*/
class QQuickPackagePrivate : public QObjectPrivate
{
public:
QQuickPackagePrivate() {}
struct DataGuard : public QQmlGuard<QObject>
{
DataGuard(QObject *obj, QList<DataGuard> *l) : list(l) { (QQmlGuard<QObject>&)*this = obj; }
QList<DataGuard> *list;
void objectDestroyed(QObject *) override {
// we assume priv will always be destroyed after objectDestroyed calls
list->removeOne(*this);
}
};
QList<DataGuard> dataList;
static void data_append(QQmlListProperty<QObject> *prop, QObject *o) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->append(DataGuard(o, list));
}
static void data_clear(QQmlListProperty<QObject> *prop) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->clear();
}
static QObject *data_at(QQmlListProperty<QObject> *prop, int index) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
return list->at(index);
}
static int data_count(QQmlListProperty<QObject> *prop) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
return list->count();
}
static void data_replace(QQmlListProperty<QObject> *prop, int index, QObject *o) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->replace(index, DataGuard(o, list));
}
static void data_removeLast(QQmlListProperty<QObject> *prop) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->removeLast();
}
};
QHash<QObject *, QQuickPackageAttached *> QQuickPackageAttached::attached;
QQuickPackageAttached::QQuickPackageAttached(QObject *parent)
: QObject(parent)
{
attached.insert(parent, this);
}
QQuickPackageAttached::~QQuickPackageAttached()
{
attached.remove(parent());
}
QString QQuickPackageAttached::name() const
{
return _name;
}
void QQuickPackageAttached::setName(const QString &n)
{
_name = n;
}
QQuickPackage::QQuickPackage(QObject *parent)
: QObject(*(new QQuickPackagePrivate), parent)
{
}
QQuickPackage::~QQuickPackage()
{
}
QQmlListProperty<QObject> QQuickPackage::data()
{
Q_D(QQuickPackage);
return QQmlListProperty<QObject>(this, &d->dataList,
QQuickPackagePrivate::data_append,
QQuickPackagePrivate::data_count,
QQuickPackagePrivate::data_at,
QQuickPackagePrivate::data_clear,
QQuickPackagePrivate::data_replace,
QQuickPackagePrivate::data_removeLast);
}
bool QQuickPackage::hasPart(const QString &name)
{
Q_D(QQuickPackage);
for (int ii = 0; ii < d->dataList.count(); ++ii) {
QObject *obj = d->dataList.at(ii);
QQuickPackageAttached *a = QQuickPackageAttached::attached.value(obj);
if (a && a->name() == name)
return true;
}
return false;
}
QObject *QQuickPackage::part(const QString &name)
{
Q_D(QQuickPackage);
if (name.isEmpty() && !d->dataList.isEmpty())
return d->dataList.at(0);
for (int ii = 0; ii < d->dataList.count(); ++ii) {
QObject *obj = d->dataList.at(ii);
QQuickPackageAttached *a = QQuickPackageAttached::attached.value(obj);
if (a && a->name() == name)
return obj;
}
if (name == QLatin1String("default") && !d->dataList.isEmpty())
return d->dataList.at(0);
return nullptr;
}
QQuickPackageAttached *QQuickPackage::qmlAttachedProperties(QObject *o)
{
return new QQuickPackageAttached(o);
}
QT_END_NAMESPACE
#include "moc_qquickpackage_p.cpp"
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