Question

我已经尝试了几天来弄清楚为什么我的QAbstractLisModel不允许用户在三种状态下切换可检查项目。模型在flags（）方法中返回Qt.IsTristate和Qt.ItemIsUserCheckable，但是当程序运行时，只有Qt.Checked和Qt.Unchecked在编辑时切换。

class cboxModel(QtCore.QAbstractListModel):
    def __init__(self, parent=None):
        super(cboxModel, self).__init__(parent)
        self.cboxes = [
            ['a',0],
            ['b',1],
            ['c',2],
            ['d',0]
        ]

    def rowCount(self,index=QtCore.QModelIndex()):
        return len(self.cboxes)

    def data(self,index,role):
        if not index.isValid: return QtCore.QVariant()
        myname,mystate = self.cboxes[index.row()]
        if role == QtCore.Qt.DisplayRole:
            return QtCore.QVariant(myname)
        if role == QtCore.Qt.CheckStateRole:
            if mystate == 0:
                return QtCore.QVariant(QtCore.Qt.Unchecked)
            elif mystate == 1:
                return QtCore.QVariant(QtCore.Qt.PartiallyChecked)
            elif mystate == 2:
                return QtCore.QVariant(QtCore.Qt.Checked)
        return QtCore.QVariant()

    def setData(self,index,value,role=QtCore.Qt.EditRole):
        if index.isValid():
            self.cboxes[index.row()][1] = value.toInt()[0]            
            self.emit(QtCore.SIGNAL("dataChanged(QModelIndex,QModelIndex)"),
                      index, index)
            print self.cboxes
            return True
        return False

    def flags(self,index):
        if not index.isValid():
            return QtCore.Qt.ItemIsEditable
        return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsEditable |     QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsTristate

你可以用它来测试它，

class MainForm(QtGui.QMainWindow):

    def __init__(self, parent=None):
        super(MainForm, self).__init__(parent)

        model = cboxModel(self)

        self.view = QtGui.QListView()
        self.view.setModel(model)

        self.setCentralWidget(self.view)


app = QtGui.QApplication(sys.argv)
form = MainForm()
form.show()
app.exec_()

并且看到只有2个州可用。我假设有一些简单的我缺少。有任何想法吗？谢谢！

Answer 1

您可能需要在clicked（）信号上创建一个自定义插槽，该插槽循环显示三种状态。通常，三态元素仅能够直接点击和关闭，并且仅在子元素处于不同状态时才处于部分检查模式。

Answer 2

看起来这是一个已知问题，请点击此处：

108755 - Qt::ItemIsTristate fails to set checkboxs within a model view to being Tristate

PyQt QAbstractListModel似乎忽略了三态标志

2 个答案: