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42 #include "qquickvisualitemmodel_p.h"
43 #include "qquickitem.h"
45 #include <QtCore/qcoreapplication.h>
46 #include <QtQml/qqmlcontext.h>
47 #include <QtQml/qqmlengine.h>
49 #include <private/qquickchangeset_p.h>
50 #include <private/qqmlglobal_p.h>
51 #include <private/qobject_p.h>
53 #include <QtCore/qhash.h>
54 #include <QtCore/qlist.h>
58 QHash<QObject*, QQuickVisualItemModelAttached*> QQuickVisualItemModelAttached::attachedProperties;
61 class QQuickVisualItemModelPrivate : public QObjectPrivate
63 Q_DECLARE_PUBLIC(QQuickVisualItemModel)
65 QQuickVisualItemModelPrivate() : QObjectPrivate() {}
67 static void children_append(QQmlListProperty<QQuickItem> *prop, QQuickItem *item) {
68 static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.append(Item(item));
69 static_cast<QQuickVisualItemModelPrivate *>(prop->data)->itemAppended();
70 static_cast<QQuickVisualItemModelPrivate *>(prop->data)->emitChildrenChanged();
73 static int children_count(QQmlListProperty<QQuickItem> *prop) {
74 return static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.count();
77 static QQuickItem *children_at(QQmlListProperty<QQuickItem> *prop, int index) {
78 return static_cast<QQuickVisualItemModelPrivate *>(prop->data)->children.at(index).item;
82 Q_Q(QQuickVisualItemModel);
83 QQuickVisualItemModelAttached *attached = QQuickVisualItemModelAttached::properties(children.last().item);
84 attached->setIndex(children.count()-1);
85 QQuickChangeSet changeSet;
86 changeSet.insert(children.count() - 1, 1);
87 emit q->modelUpdated(changeSet, false);
88 emit q->countChanged();
91 void emitChildrenChanged() {
92 Q_Q(QQuickVisualItemModel);
93 emit q->childrenChanged();
96 int indexOf(QQuickItem *item) const {
97 for (int i = 0; i < children.count(); ++i)
98 if (children.at(i).item == item)
105 Item(QQuickItem *i) : item(i), ref(0) {}
107 void addRef() { ++ref; }
108 bool deref() { return --ref == 0; }
114 QList<Item> children;
119 \qmltype VisualItemModel
120 \instantiates QQuickVisualItemModel
121 \inqmlmodule QtQuick 2
122 \ingroup qtquick-models
123 \brief Defines items to be used added 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 {quick/modelviews/visualitemmodel}{VisualItemModel example}
156 QQuickVisualItemModel::QQuickVisualItemModel(QObject *parent)
157 : QQuickVisualModel(*(new QQuickVisualItemModelPrivate), 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 QQmlListProperty<QQuickItem> QQuickVisualItemModel::children()
170 Q_D(QQuickVisualItemModel);
171 return QQmlListProperty<QQuickItem>(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 QQuickVisualItemModel::count() const
182 Q_D(const QQuickVisualItemModel);
183 return d->children.count();
186 bool QQuickVisualItemModel::isValid() const
191 QQuickItem *QQuickVisualItemModel::item(int index, bool)
193 Q_D(QQuickVisualItemModel);
194 QQuickVisualItemModelPrivate::Item &item = d->children[index];
197 emit initItem(index, item.item);
198 emit createdItem(index, item.item);
203 QQuickVisualModel::ReleaseFlags QQuickVisualItemModel::release(QQuickItem *item)
205 Q_D(QQuickVisualItemModel);
206 int idx = d->indexOf(item);
208 if (d->children[idx].deref()) {
209 // XXX todo - the original did item->scene()->removeItem(). Why?
210 item->setParentItem(0);
212 return QQuickVisualModel::Referenced;
218 QString QQuickVisualItemModel::stringValue(int index, const QString &name)
220 Q_D(QQuickVisualItemModel);
221 if (index < 0 || index >= d->children.count())
223 return QQmlEngine::contextForObject(d->children.at(index).item)->contextProperty(name).toString();
226 int QQuickVisualItemModel::indexOf(QQuickItem *item, QObject *) const
228 Q_D(const QQuickVisualItemModel);
229 return d->indexOf(item);
232 QQuickVisualItemModelAttached *QQuickVisualItemModel::qmlAttachedProperties(QObject *obj)
234 return QQuickVisualItemModelAttached::properties(obj);