How to provide data from PySide QAbstractItemModel subclass to QML ListView?

问题

I have an app I'm writing in PySide that has a QML UI. I have subclassed QAbstractListModel in Python:

class MyModel(QtCore.QAbstractListModel):
    def __init__(self, parent=None):
        QtCore.QAbstractListModel.__init__(self, parent)
        self._things = ["foo", "bar", "baz"]

    def rowCount(self, parent=QtCore.QModelIndex()):
        return len(self._things)

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if role == QtCore.Qt.DisplayRole:
            return self._things[index.row()]
        return None

I provide the model to my QML by doing this in the main script:

model = MyModel()
view.rootContext().setContextProperty("mymodel", model)

Qt's docs say that the model's role names are used to access the data from QML, and that one can refer to the normal DisplayRole in QML as "display", therefore my QML has a ListView with a simple delegate like this:

ListView {
         anchors.fill: parent
         model: mymodel
         delegate: Component { Text { text: display } }
}

However, when I do this the result is file:///foo/bar/main.qml:28: ReferenceError: Can't find variable: display.

Setting custom role names in the model does not help. Ideas?

回答1:

You need to set the role names for the model to be able to access the data in QML;

http://doc.qt.io/archives/qt-4.7/qabstractitemmodel.html#setRoleNames

来源：https://stackoverflow.com/questions/4013615/how-to-provide-data-from-pyside-qabstractitemmodel-subclass-to-qml-listview