diff options
Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp | 168 |
1 files changed, 161 insertions, 7 deletions
diff --git a/src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp b/src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp index 9216793..9c11f25 100644 --- a/src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp +++ b/src/declarative/graphicsitems/qmlgraphicsvisualitemmodel.cpp @@ -187,7 +187,6 @@ QVariant QmlGraphicsVisualItemModel::evaluate(int index, const QString &expressi QmlContext *ctxt = new QmlContext(ccontext); ctxt->addDefaultObject(d->children.at(index)); QmlExpression e(ctxt, expression, objectContext); - e.setTrackChange(false); QVariant value = e.value(); delete ctxt; return value; @@ -327,7 +326,7 @@ public: if (m_listModelInterface) return m_listModelInterface->count(); if (m_abstractItemModel) - return m_abstractItemModel->rowCount(); + return m_abstractItemModel->rowCount(m_root); if (m_listAccessor) return m_listAccessor->count(); return 0; @@ -348,6 +347,8 @@ public: QVariant m_modelVariant; QmlListAccessor *m_listAccessor; + + QModelIndex m_root; }; class QmlGraphicsVisualDataModelDataMetaObject : public QmlOpenMetaObject @@ -461,7 +462,7 @@ QVariant QmlGraphicsVisualDataModelDataMetaObject::initialValue(int propId) QHash<QByteArray,int>::const_iterator it = model->m_roleNames.find(propName); if (it != model->m_roleNames.end()) { roleToProp.insert(*it, propId); - QModelIndex index = model->m_abstractItemModel->index(data->m_index, 0); + QModelIndex index = model->m_abstractItemModel->index(data->m_index, 0, model->m_root); return model->m_abstractItemModel->data(index, *it); } } @@ -560,6 +561,39 @@ QmlGraphicsVisualDataModelData *QmlGraphicsVisualDataModelPrivate::data(QObject //--------------------------------------------------------------------------- +/*! + \qmlclass VisualDataModel QmlGraphicsVisualDataModel + \brief The VisualDataModel encapsulates a model and delegate + + A VisualDataModel encapsulates a model and the delegate that will + be instantiated for items in the model. + + It is usually not necessary to create a VisualDataModel directly, + since the QML views will create one internally. + + The example below illustrates using a VisualDataModel with a ListView. + + \code + VisualDataModel { + id: visualModel + model: myModel + delegate: Component { + Rectangle { + height: 25 + width: 100 + Text { text: "Name:" + name} + } + } + } + ListView { + width: 100 + height: 100 + anchors.fill: parent + model: visualModel + } + \endcode +*/ + QmlGraphicsVisualDataModel::QmlGraphicsVisualDataModel() : QmlGraphicsVisualModel(*(new QmlGraphicsVisualDataModelPrivate(0))) { @@ -579,6 +613,20 @@ QmlGraphicsVisualDataModel::~QmlGraphicsVisualDataModel() d->m_delegateDataType->release(); } +/*! + \qmlproperty model VisualDataModel::model + This property holds the model providing data for the VisualDataModel. + + The model provides a set of data that is used to create the items + for a view. For large or dynamic datasets the model is usually + provided by a C++ model object. The C++ model object must be a \l + {QAbstractItemModel} subclass or a simple list. + + Models can also be created directly in QML, using a \l{ListModel} or + \l{XmlListModel}. + + \sa {qmlmodels}{Data Models} +*/ QVariant QmlGraphicsVisualDataModel::model() const { Q_D(const QmlGraphicsVisualDataModel); @@ -682,6 +730,16 @@ void QmlGraphicsVisualDataModel::setModel(const QVariant &model) } } +/*! + \qmlproperty component VisualDataModel::delegate + + The delegate provides a template defining each item instantiated by a view. + The index is exposed as an accessible \c index property. Properties of the + model are also available depending upon the type of \l {qmlmodels}{Data Model}. + + Here is an example delegate: + \snippet doc/src/snippets/declarative/listview/listview.qml 0 +*/ QmlComponent *QmlGraphicsVisualDataModel::delegate() const { Q_D(const QmlGraphicsVisualDataModel); @@ -705,6 +763,105 @@ void QmlGraphicsVisualDataModel::setDelegate(QmlComponent *delegate) } } +/*! + \qmlproperty QModelIndex VisualDataModel::rootIndex + + QAbstractItemModel provides a heirachical tree of data, whereas + QML only operates on list data. rootIndex allows the children of + any node in a QAbstractItemModel to be provided by this model. + + This property only affects models of type QAbstractItemModel. + + \code + // main.cpp + Q_DECLARE_METATYPE(QModelIndex) + + class MyModel : public QDirModel + { + Q_OBJECT + public: + MyModel(QmlContext *ctxt) : QDirModel(), context(ctxt) { + QHash<int,QByteArray> roles = roleNames(); + roles.insert(FilePathRole, "path"); + setRoleNames(roles); + context->setContextProperty("myModel", this); + context->setContextProperty("myRoot", QVariant::fromValue(index(0,0,QModelIndex()))); + } + + Q_INVOKABLE void setRoot(const QString &path) { + QModelIndex root = index(path); + context->setContextProperty("myRoot", QVariant::fromValue(root)); + } + + QmlContext *context; + }; + + int main(int argc, char ** argv) + { + QApplication app(argc, argv); + + QmlView view; + view.setSource(QUrl("qrc:view.qml")); + + MyModel model(view.rootContext()); + + view.execute(); + view.show(); + + return app.exec(); + } + + #include "main.moc" + \endcode + + \code + // view.qml + import Qt 4.6 + + ListView { + width: 200 + height: 200 + model: VisualDataModel { + model: myModel + rootIndex: myRoot + delegate: Component { + Rectangle { + height: 25; width: 100 + Text { text: path } + MouseRegion { + anchors.fill: parent; + onClicked: myModel.setRoot(path) + } + } + } + } + } + \endcode + +*/ +QModelIndex QmlGraphicsVisualDataModel::rootIndex() const +{ + Q_D(const QmlGraphicsVisualDataModel); + return d->m_root; +} + +void QmlGraphicsVisualDataModel::setRootIndex(const QModelIndex &root) +{ + Q_D(QmlGraphicsVisualDataModel); + if (d->m_root != root) { + int oldCount = d->modelCount(); + d->m_root = root; + int newCount = d->modelCount(); + if (d->m_delegate && oldCount) + emit itemsRemoved(0, oldCount); + if (d->m_delegate && newCount) + emit itemsInserted(0, newCount); + if (newCount != oldCount) + emit countChanged(); + emit rootIndexChanged(); + } +} + QString QmlGraphicsVisualDataModel::part() const { Q_D(const QmlGraphicsVisualDataModel); @@ -786,7 +943,6 @@ QmlGraphicsItem *QmlGraphicsVisualDataModel::item(int index, const QByteArray &v if (d->modelCount() <= 0 || !d->m_delegate) return 0; - QObject *nobj = d->m_cache.getItem(index); if (!nobj) { QmlContext *ccontext = d->m_context; @@ -900,7 +1056,6 @@ QVariant QmlGraphicsVisualDataModel::evaluate(int index, const QString &expressi QmlGraphicsItem *item = qobject_cast<QmlGraphicsItem *>(nobj); if (item) { QmlExpression e(qmlContext(item), expression, objectContext); - e.setTrackChange(false); value = e.value(); } } else { @@ -910,7 +1065,6 @@ QVariant QmlGraphicsVisualDataModel::evaluate(int index, const QString &expressi QmlGraphicsVisualDataModelData *data = new QmlGraphicsVisualDataModelData(index, this); ctxt->addDefaultObject(data); QmlExpression e(ctxt, expression, objectContext); - e.setTrackChange(false); value = e.value(); delete data; delete ctxt; @@ -943,7 +1097,7 @@ void QmlGraphicsVisualDataModel::_q_itemsChanged(int index, int count, if (d->m_listModelInterface) { data->setValue(propId, d->m_listModelInterface->data(ii, QList<int>() << role).value(role)); } else if (d->m_abstractItemModel) { - QModelIndex index = d->m_abstractItemModel->index(ii, 0); + QModelIndex index = d->m_abstractItemModel->index(ii, 0, d->m_root); data->setValue(propId, d->m_abstractItemModel->data(index, role)); } } |