QTreeView更新显示文本

Question

我如何在保持当前折叠/展开状态不变的情况下，为整个模型正确更新第二列的显示文本？我想在用户在前缀输入字段中键入内容时进行更新。

“新名称”显示文本是模型中每个项目的UserRole中存在的类Object的属性。理想情况下，当类对象的属性“新名称”更改时，UI会自动更新以显示正确的值。

这是通过在模型中使用额外的自定义角色来完成的吗？还是子类化QstandardItem或QstandardItemModel的某种方式？我不确定推荐的解决方案是什么？

我正在使用PySide和Python 2.7

################################################################################
# Imports
################################################################################
import os, sys, random
sys.path.append(os.environ.get('PS_SITEPACKAGES'))
from Qt import QtCore, QtWidgets, QtGui


################################################################################
# Objects
################################################################################
class AbstractObject(object):
    def __init__(self, name):
        self._name = name
        self._children = []
        self._newName = ''

    # methods 
    def children(self):
        return self._children


    def getName(self):
        return self._name


    def getNewName(self):
        return self._newName


    def setNewName(self, value):
        self._newName = value


class PersonObject(AbstractObject):
    def __init__(self, obj):
        AbstractObject.__init__(self, obj)


class CityObject(AbstractObject):
    def __init__(self, obj):
        AbstractObject.__init__(self, obj)


class StateObject(AbstractObject):
    def __init__(self, name):
        AbstractObject.__init__(self, name)


################################################################################
# Widgets
################################################################################
class OutlinerTreeView(QtWidgets.QTreeView):
    def __init__(self):
        QtWidgets.QTreeView.__init__(self)

        self.model = QtGui.QStandardItemModel()
        self.model.setHorizontalHeaderLabels(['Name', 'New Name'])
        # self.setHeaderHidden(True)
        self.setUniformRowHeights(True)
        self.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
        self.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectRows)
        self.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)
        self.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self.setModel(self.model)

        # begin
        self.populateModel()


    # methods
    def getDummyData(self):
        '''
        Description:
            Returns scene hierarchy layout of Layers, Objects, Materials.
        '''

        states = ['Alabama', 'Alaska', 'American Samoa', 'Arizona', 'Arkansas']
        cities = ['New York', 'Los Angeles', 'Chicago', 'Houston', 'Phoenix', 'Philadelphia', 'San Antonio', 'San Diego', 'Dallas', 'San Jose', 'Detroit', 'Jacksonville', 'Indianapolis', 'San Francisco']

        layout = []
        for i in states:
            state = StateObject(i)

            # for each state create random city with people
            for x in range(random.randint(0,4)):
                cityName = cities[random.randint(0, len(cities)-1)]
                city = CityObject(cityName)
                state._children.append(city)

            # append main layout
            layout.append(state)
        return layout


    def appendItem(self, obj, parent):
        col1 = QtGui.QStandardItem()
        col1.setData(obj.getName(), role=QtCore.Qt.DisplayRole)
        col1.setData(obj, role=QtCore.Qt.UserRole)
        parent.appendRow([col1])

        # Recursive
        for x in obj.children():
            self.appendItem(x, col1)


    def populateModel(self):
        items = self.getDummyData()
        for x in items:
            self.appendItem(x, self.model.invisibleRootItem())



class Dialog(QtWidgets.QDialog):
    def __init__(self):
        super(Dialog, self).__init__()

        self.treeView = OutlinerTreeView()
        self.prefix = QtWidgets.QLineEdit()
        self.prefix.setPlaceholderText('Prefix')

        self.mainLayout = QtWidgets.QVBoxLayout()
        self.mainLayout.addWidget(self.treeView)
        self.mainLayout.addWidget(self.prefix)
        self.setLayout(self.mainLayout)


################################################################################
# Unit Test
################################################################################
def unitTest_outlinerTreeView():
    mxs.clearlistener()




if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    dlg = Dialog()
    dlg.show()
    sys.exit(app.exec_())