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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickvisualitemmodel_p.h"
#include "qquickitem.h"
#include <QtCore/qcoreapplication.h>
#include <QtQml/qqmlcontext.h>
#include <QtQml/qqmlengine.h>
#include <private/qquickchangeset_p.h>
#include <private/qqmlglobal_p.h>
#include <private/qobject_p.h>
#include <QtCore/qhash.h>
#include <QtCore/qlist.h>
QT_BEGIN_NAMESPACE
QHash<QObject*, QQuickVisualItemModelAttached*> QQuickVisualItemModelAttached::attachedProperties;
class QQuickVisualItemModelPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QQuickVisualItemModel)
public:
QQuickVisualItemModelPrivate() : QObjectPrivate() {}
static void children_append(QQmlListProperty<QQuickItem> *prop, QQuickItem *item) {
static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.append(Item(item));
static_cast<QQuickVisualItemModelPrivate *>(prop->data)->itemAppended();
static_cast<QQuickVisualItemModelPrivate *>(prop->data)->emitChildrenChanged();
}
static int children_count(QQmlListProperty<QQuickItem> *prop) {
return static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.count();
}
static QQuickItem *children_at(QQmlListProperty<QQuickItem> *prop, int index) {
return static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.at(index).item;
}
void itemAppended() {
Q_Q(QQuickVisualItemModel);
QQuickVisualItemModelAttached *attached = QQuickVisualItemModelAttached::properties(children.last().item);
attached->setIndex(children.count()-1);
QQuickChangeSet changeSet;
changeSet.insert(children.count() - 1, 1);
emit q->modelUpdated(changeSet, false);
emit q->countChanged();
}
void emitChildrenChanged() {
Q_Q(QQuickVisualItemModel);
emit q->childrenChanged();
}
int indexOf(QQuickItem *item) const {
for (int i = 0; i < children.count(); ++i)
if (children.at(i).item == item)
return i;
return -1;
}
class Item {
public:
Item(QQuickItem *i) : item(i), ref(0) {}
void addRef() { ++ref; }
bool deref() { return --ref == 0; }
QQuickItem *item;
int ref;
};
QList<Item> children;
};
/*!
\qmltype VisualItemModel
\instantiates QQuickVisualItemModel
\inqmlmodule QtQuick 2
\ingroup qtquick-models
\brief Defines items to be used added to a view
A VisualItemModel contains the visual items to be used in a view.
When a VisualItemModel is used in a view, the view does not require
a delegate since the VisualItemModel already contains the visual
delegate (items).
An item can determine its index within the
model via the \l{VisualItemModel::index}{index} attached property.
The example below places three colored rectangles in a ListView.
\code
import QtQuick 2.0
Rectangle {
VisualItemModel {
id: itemModel
Rectangle { height: 30; width: 80; color: "red" }
Rectangle { height: 30; width: 80; color: "green" }
Rectangle { height: 30; width: 80; color: "blue" }
}
ListView {
anchors.fill: parent
model: itemModel
}
}
\endcode
\image visualitemmodel.png
\sa {quick/modelviews/visualitemmodel}{VisualItemModel example}
*/
QQuickVisualItemModel::QQuickVisualItemModel(QObject *parent)
: QQuickVisualModel(*(new QQuickVisualItemModelPrivate), parent)
{
}
/*!
\qmlattachedproperty int QtQuick2::VisualItemModel::index
This attached property holds the index of this delegate's item within the model.
It is attached to each instance of the delegate.
*/
QQmlListProperty<QQuickItem> QQuickVisualItemModel::children()
{
Q_D(QQuickVisualItemModel);
return QQmlListProperty<QQuickItem>(this, d, d->children_append,
d->children_count, d->children_at);
}
/*!
\qmlproperty int QtQuick2::VisualItemModel::count
The number of items in the model. This property is readonly.
*/
int QQuickVisualItemModel::count() const
{
Q_D(const QQuickVisualItemModel);
return d->children.count();
}
bool QQuickVisualItemModel::isValid() const
{
return true;
}
QQuickItem *QQuickVisualItemModel::item(int index, bool)
{
Q_D(QQuickVisualItemModel);
QQuickVisualItemModelPrivate::Item &item = d->children[index];
item.addRef();
if (item.ref == 1) {
emit initItem(index, item.item);
emit createdItem(index, item.item);
}
return item.item;
}
QQuickVisualModel::ReleaseFlags QQuickVisualItemModel::release(QQuickItem *item)
{
Q_D(QQuickVisualItemModel);
int idx = d->indexOf(item);
if (idx >= 0) {
if (d->children[idx].deref()) {
// XXX todo - the original did item->scene()->removeItem(). Why?
item->setParentItem(0);
} else {
return QQuickVisualModel::Referenced;
}
}
return 0;
}
QString QQuickVisualItemModel::stringValue(int index, const QString &name)
{
Q_D(QQuickVisualItemModel);
if (index < 0 || index >= d->children.count())
return QString();
return QQmlEngine::contextForObject(d->children.at(index).item)->contextProperty(name).toString();
}
int QQuickVisualItemModel::indexOf(QQuickItem *item, QObject *) const
{
Q_D(const QQuickVisualItemModel);
return d->indexOf(item);
}
QQuickVisualItemModelAttached *QQuickVisualItemModel::qmlAttachedProperties(QObject *obj)
{
return QQuickVisualItemModelAttached::properties(obj);
}
QT_END_NAMESPACE
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