1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
10 ** GNU Lesser General Public License Usage
11 ** This file may be used under the terms of the GNU Lesser General Public
12 ** License version 2.1 as published by the Free Software Foundation and
13 ** appearing in the file LICENSE.LGPL included in the packaging of this
14 ** file. Please review the following information to ensure the GNU Lesser
15 ** General Public License version 2.1 requirements will be met:
16 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
18 ** In addition, as a special exception, Nokia gives you certain additional
19 ** rights. These rights are described in the Nokia Qt LGPL Exception
20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
22 ** GNU General Public License Usage
23 ** Alternatively, this file may be used under the terms of the GNU General
24 ** Public License version 3.0 as published by the Free Software Foundation
25 ** and appearing in the file LICENSE.GPL included in the packaging of this
26 ** file. Please review the following information to ensure the GNU General
27 ** Public License version 3.0 requirements will be met:
28 ** http://www.gnu.org/copyleft/gpl.html.
31 ** Alternatively, this file may be used in accordance with the terms and
32 ** conditions contained in a signed written agreement between you and Nokia.
40 ****************************************************************************/
42 #include "qsgvisualitemmodel_p.h"
45 #include <QtCore/qcoreapplication.h>
46 #include <QtDeclarative/qdeclarativecontext.h>
47 #include <QtDeclarative/qdeclarativeengine.h>
49 #include <private/qdeclarativechangeset_p.h>
50 #include <private/qdeclarativeglobal_p.h>
51 #include <private/qobject_p.h>
53 #include <QtCore/qhash.h>
54 #include <QtCore/qlist.h>
58 QHash<QObject*, QSGVisualItemModelAttached*> QSGVisualItemModelAttached::attachedProperties;
61 class QSGVisualItemModelPrivate : public QObjectPrivate
63 Q_DECLARE_PUBLIC(QSGVisualItemModel)
65 QSGVisualItemModelPrivate() : QObjectPrivate() {}
67 static void children_append(QDeclarativeListProperty<QSGItem> *prop, QSGItem *item) {
68 QDeclarative_setParent_noEvent(item, prop->object);
69 static_cast<QSGVisualItemModelPrivate *>(prop->data)->children.append(Item(item));
70 static_cast<QSGVisualItemModelPrivate *>(prop->data)->itemAppended();
71 static_cast<QSGVisualItemModelPrivate *>(prop->data)->emitChildrenChanged();
74 static int children_count(QDeclarativeListProperty<QSGItem> *prop) {
75 return static_cast<QSGVisualItemModelPrivate *>(prop->data)->children.count();
78 static QSGItem *children_at(QDeclarativeListProperty<QSGItem> *prop, int index) {
79 return static_cast<QSGVisualItemModelPrivate *>(prop->data)->children.at(index).item;
83 Q_Q(QSGVisualItemModel);
84 QSGVisualItemModelAttached *attached = QSGVisualItemModelAttached::properties(children.last().item);
85 attached->setIndex(children.count()-1);
86 QDeclarativeChangeSet changeSet;
87 changeSet.insert(children.count() - 1, 1);
88 emit q->modelUpdated(changeSet, false);
89 emit q->countChanged();
92 void emitChildrenChanged() {
93 Q_Q(QSGVisualItemModel);
94 emit q->childrenChanged();
97 int indexOf(QSGItem *item) const {
98 for (int i = 0; i < children.count(); ++i)
99 if (children.at(i).item == item)
106 Item(QSGItem *i) : item(i), ref(0) {}
108 void addRef() { ++ref; }
109 bool deref() { return --ref == 0; }
115 QList<Item> children;
120 \qmlclass VisualItemModel QSGVisualItemModel
121 \inqmlmodule QtQuick 2
122 \ingroup qml-working-with-data
123 \brief The VisualItemModel allows items to be provided to a view.
125 A VisualItemModel contains the visual items to be used in a view.
126 When a VisualItemModel is used in a view, the view does not require
127 a delegate since the VisualItemModel already contains the visual
130 An item can determine its index within the
131 model via the \l{VisualItemModel::index}{index} attached property.
133 The example below places three colored rectangles in a ListView.
140 Rectangle { height: 30; width: 80; color: "red" }
141 Rectangle { height: 30; width: 80; color: "green" }
142 Rectangle { height: 30; width: 80; color: "blue" }
152 \image visualitemmodel.png
154 \sa {declarative/modelviews/visualitemmodel}{VisualItemModel example}
156 QSGVisualItemModel::QSGVisualItemModel(QObject *parent)
157 : QSGVisualModel(*(new QSGVisualItemModelPrivate), parent)
162 \qmlattachedproperty int QtQuick2::VisualItemModel::index
163 This attached property holds the index of this delegate's item within the model.
165 It is attached to each instance of the delegate.
168 QDeclarativeListProperty<QSGItem> QSGVisualItemModel::children()
170 Q_D(QSGVisualItemModel);
171 return QDeclarativeListProperty<QSGItem>(this, d, d->children_append,
172 d->children_count, d->children_at);
176 \qmlproperty int QtQuick2::VisualItemModel::count
178 The number of items in the model. This property is readonly.
180 int QSGVisualItemModel::count() const
182 Q_D(const QSGVisualItemModel);
183 return d->children.count();
186 bool QSGVisualItemModel::isValid() const
191 QSGItem *QSGVisualItemModel::item(int index, bool)
193 Q_D(QSGVisualItemModel);
194 QSGVisualItemModelPrivate::Item &item = d->children[index];
199 QSGVisualModel::ReleaseFlags QSGVisualItemModel::release(QSGItem *item)
201 Q_D(QSGVisualItemModel);
202 int idx = d->indexOf(item);
204 if (d->children[idx].deref()) {
205 // XXX todo - the original did item->scene()->removeItem(). Why?
206 item->setParentItem(0);
207 QDeclarative_setParent_noEvent(item, this);
213 bool QSGVisualItemModel::completePending() const
218 void QSGVisualItemModel::completeItem()
223 QString QSGVisualItemModel::stringValue(int index, const QString &name)
225 Q_D(QSGVisualItemModel);
226 if (index < 0 || index >= d->children.count())
228 return QDeclarativeEngine::contextForObject(d->children.at(index).item)->contextProperty(name).toString();
231 int QSGVisualItemModel::indexOf(QSGItem *item, QObject *) const
233 Q_D(const QSGVisualItemModel);
234 return d->indexOf(item);
237 QSGVisualItemModelAttached *QSGVisualItemModel::qmlAttachedProperties(QObject *obj)
239 return QSGVisualItemModelAttached::properties(obj);