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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/qdeclarativepackage_p.h"
#include <private/qobject_p.h>
#include <private/qdeclarativeguard_p.h>
QT_BEGIN_NAMESPACE
/*!
\qmlclass Package QDeclarativePackage
\ingroup qml-working-with-data
\brief Package provides a collection of named items.
The Package class is used in conjunction with
VisualDataModel 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 element in the package (the \l Rectangle) is parented to whichever
delegate it should appear in. This allows an item to move
between views.
\snippet examples/declarative/modelviews/package/Delegate.qml 0
These named items are used as the delegates by the two views who
reference the special \l{VisualDataModel::parts} property to select
a model which provides the chosen delegate.
\snippet examples/declarative/modelviews/package/view.qml 0
\sa {declarative/modelviews/package}{Package example}, {demos/declarative/photoviewer}{Photo Viewer demo}, QtDeclarative
*/
/*!
\qmlattachedproperty string Package::name
This attached property holds the name of an item within a Package.
*/
class QDeclarativePackagePrivate : public QObjectPrivate
{
public:
QDeclarativePackagePrivate() {}
struct DataGuard : public QDeclarativeGuard<QObject>
{
DataGuard(QObject *obj, QList<DataGuard> *l) : list(l) { (QDeclarativeGuard<QObject>&)*this = obj; }
QList<DataGuard> *list;
void objectDestroyed(QObject *) {
// we assume priv will always be destroyed after objectDestroyed calls
list->removeOne(*this);
}
};
QList<DataGuard> dataList;
static void data_append(QDeclarativeListProperty<QObject> *prop, QObject *o) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->append(DataGuard(o, list));
}
static void data_clear(QDeclarativeListProperty<QObject> *prop) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
list->clear();
}
static QObject *data_at(QDeclarativeListProperty<QObject> *prop, int index) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
return list->at(index);
}
static int data_count(QDeclarativeListProperty<QObject> *prop) {
QList<DataGuard> *list = static_cast<QList<DataGuard> *>(prop->data);
return list->count();
}
};
QHash<QObject *, QDeclarativePackageAttached *> QDeclarativePackageAttached::attached;
QDeclarativePackageAttached::QDeclarativePackageAttached(QObject *parent)
: QObject(parent)
{
attached.insert(parent, this);
}
QDeclarativePackageAttached::~QDeclarativePackageAttached()
{
attached.remove(parent());
}
QString QDeclarativePackageAttached::name() const
{
return _name;
}
void QDeclarativePackageAttached::setName(const QString &n)
{
_name = n;
}
QDeclarativePackage::QDeclarativePackage(QObject *parent)
: QObject(*(new QDeclarativePackagePrivate), parent)
{
}
QDeclarativePackage::~QDeclarativePackage()
{
Q_D(QDeclarativePackage);
for (int ii = 0; ii < d->dataList.count(); ++ii) {
QObject *obj = d->dataList.at(ii);
obj->setParent(this);
}
}
QDeclarativeListProperty<QObject> QDeclarativePackage::data()
{
Q_D(QDeclarativePackage);
return QDeclarativeListProperty<QObject>(this, &d->dataList, QDeclarativePackagePrivate::data_append,
QDeclarativePackagePrivate::data_count,
QDeclarativePackagePrivate::data_at,
QDeclarativePackagePrivate::data_clear);
}
bool QDeclarativePackage::hasPart(const QString &name)
{
Q_D(QDeclarativePackage);
for (int ii = 0; ii < d->dataList.count(); ++ii) {
QObject *obj = d->dataList.at(ii);
QDeclarativePackageAttached *a = QDeclarativePackageAttached::attached.value(obj);
if (a && a->name() == name)
return true;
}
return false;
}
QObject *QDeclarativePackage::part(const QString &name)
{
Q_D(QDeclarativePackage);
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);
QDeclarativePackageAttached *a = QDeclarativePackageAttached::attached.value(obj);
if (a && a->name() == name)
return obj;
}
if (name == QLatin1String("default") && !d->dataList.isEmpty())
return d->dataList.at(0);
return 0;
}
QDeclarativePackageAttached *QDeclarativePackage::qmlAttachedProperties(QObject *o)
{
return new QDeclarativePackageAttached(o);
}
QT_END_NAMESPACE
|
