调用类以在 Window 中构建 QTreeWidget：参数 1 具有意外类型“Ui_MainWindow”

Question

我正在使用从ekhumoro 获得的代码从我创建的 GUI 的 xml 文件动态创建树，但是当尝试调用从 pyuic4 生成的 _ui.py 文件中的类时，我'正在返回 Ui_MainWindow 类而不是预期的参数。

XmlHandler，它创建树项（据我的理解）：

from PyQt4 import QtCore, QtGui, QtXml
from PyQt4.QtXml import *


class XmlHandler(QXmlDefaultHandler):
    def __init__(self, root):
        QtXml.QXmlDefaultHandler.__init__(self)
        self._root = root
        self._item = None
        self._text = ''
        self._error = ''

    def startElement(self, namespace, name, qname, attributes):
        if qname == 'Machine' or qname == 'Feature':
            if self._item is not None:
                self._item = QtGui.QTreeWidgetItem(self._item)
            else:
                self._item = QtGui.QTreeWidgetItem(self._root)
            self._item.setData(0, QtCore.Qt.UserRole, qname)
            self._item.setText(0, 'Unknown Machine')
            if qname == 'Machine':
                self._item.setExpanded(False)
                self._item.setCheckState(0, QtCore.Qt.Unchecked)
                self._item.setFlags(QtCore.Qt.ItemIsSelectable|QtCore.Qt.ItemIsDragEnabled|QtCore.Qt.ItemIsUserCheckable|QtCore.Qt.ItemIsEnabled|QtCore.Qt.ItemIsTristate)
            elif qname == 'FeatureName':
                self._item.setText(1, self._text)
        self._text = ''
        return True

    def endElement(self, namespace, name, qname):
        if qname == 'FeatureName' or qname == 'MachineName':
            if self._item is not None:
                self._item.setText(0, self._text)
                self._item.setCheckState(0, QtCore.Qt.Unchecked)
        elif qname == 'Feature' or qname == 'Machine':
            self._item = self._item.parent()
        return True

    def characters(self, text):
        self._text += text
        return True

    def fatalError(self, exception):
        print('Parse Error: line %d, column %d:\n  %s' % (
              exception.lineNumber(),
              exception.columnNumber(),
              exception.message(),
              ))
        return False

使用 XmlHandler 制作小部件的类：

class MakeWidget(QtGui.QTreeWidget):
    def __init__(self):
        QtGui.QTreeWidget.__init__(self)
        self.header().setResizeMode(QtGui.QHeaderView.Stretch)
        self.setHeaderLabels(['Servers and Services'])
        source = QtXml.QXmlInputSource()
        source.setData(xml)
        handler = XmlHandler(self)
        reader = QtXml.QXmlSimpleReader()
        reader.setContentHandler(handler)
        reader.setErrorHandler(handler)
        reader.parse(source)

我摸索着尝试在我的 GUI 中使用它：

class Ui_MainWindow(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(950, 500)
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth())
        MainWindow.setSizePolicy(sizePolicy)
        MainWindow.setMaximumSize(QtCore.QSize(950, 500))
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.tabWidget = QtGui.QTabWidget(self.centralwidget)
        self.tabWidget.setGeometry(QtCore.QRect(0, 0, 960, 421))
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.tabWidget.sizePolicy().hasHeightForWidth())
        self.tabWidget.setSizePolicy(sizePolicy)
        self.tabWidget.setMaximumSize(QtCore.QSize(960, 430))
        self.tabWidget.setAutoFillBackground(True)
        self.tabWidget.setStyleSheet(_fromUtf8(""))
        self.tabWidget.setObjectName(_fromUtf8("tabWidget"))
        self.tabLogPuller = QtGui.QWidget()
        self.tabLogPuller.setObjectName(_fromUtf8("tabLogPuller"))
        self.groupBoxServiceSelection = QtGui.QGroupBox(self.tabLogPuller)
        self.groupBoxServiceSelection.setGeometry(QtCore.QRect(0, 0, 381, 351))
        font = QtGui.QFont()
        font.setBold(False)
        font.setWeight(50)
        self.groupBoxServiceSelection.setFont(font)
        self.groupBoxServiceSelection.setAutoFillBackground(True)
        self.groupBoxServiceSelection.setObjectName(_fromUtf8("groupBoxServiceSelection"))
        self.treeServiceSelection = MakeWidget()
        self.treeServiceSelection.setHeaderLabels(['Servers and Services'])
        self.treeServiceSelection.source = QtXml.QXmlInputSource()
        self.treeServiceSelection.source.setData(xml)
        self.treeServiceSelection.handler = XmlHandler(self)
        self.treeServiceSelection.reader = QtXml.QXmlSimpleReader()
        self.treeServiceSelection.reader.setContentHandler(self.treeServiceSelection.handler)
        self.treeServiceSelection.reader.setErrorHandler(self.treeServiceSelection.handler)
        self.treeServiceSelection.reader.parse(self.treeServiceSelection.source)
        self.treeServiceSelection.setGeometry(QtCore.QRect(10, 80, 161, 261))
        self.treeServiceSelection.setObjectName(_fromUtf8("treeServiceSelection"))

以及我在尝试运行文件时遇到的错误：

error triggered by consumer
    self._item = QtGui.QTreeWidgetItem(self._root)
TypeError: arguments did not match any overloaded call:
  QTreeWidgetItem(int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(list-of-str, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidget, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidget, list-of-str, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidget, QTreeWidgetItem, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidgetItem, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidgetItem, list-of-str, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidgetItem, QTreeWidgetItem, int type=QTreeWidgetItem.Type): argument 1 has unexpected type 'Ui_MainWindow'
  QTreeWidgetItem(QTreeWidgetItem): argument 1 has unexpected type 'Ui_MainWindow'

所以我想我的问题是：如何调用这个类并在 UI_MainWindow 类中传递正确的参数，而不是调用我假设的父类？

Answer 1

您在此处创建MakeWidget 的实例：

    self.treeServiceSelection = MakeWidget()

然后在其__init__ 中设置XmlReader 等等。但是，奇怪的是，您随后尝试在以下几行中重复这一切：

    self.treeServiceSelection.setHeaderLabels(['Servers and Services'])
    self.treeServiceSelection.source = QtXml.QXmlInputSource()
    self.treeServiceSelection.source.setData(xml)
    ...

你想在这里做什么？如果需要调整MakeWidget类的初始化，修改其__init__中的代码即可。

实际错误是由这一行引起的：

    self.treeServiceSelection.handler = XmlHandler(self)

当它需要QTreeWidget 的实例时，它将Ui_MainWindow 的实例传递给XmlHandler 的构造函数。但如前所述，这实际上是无关紧要的，因为第一行之后的所有代码无论如何都是多余的。

似乎更根本的问题是您试图直接编辑 pyuic 生成的 ui 文件，而不是导入到您的应用程序中。生成的 ui 文件应被视为只读文件。永远不要试图编辑它。

相反，您需要创建一个包含主窗口类的模块，该类执行如下操作：

from ui import Ui_MainWindow

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        ui = Ui_MainWindow()
        ui.setupUi(self)
        # other setup code goes here
        ...

我还建议您将 MakeWidget 类修改为如下内容：

class MakeWidget(QtGui.QTreeWidget):
    def __init__(self, xml, parent=None):
        QtGui.QTreeWidget.__init__(self, parent)

这样您就可以像这样在MainWindow.__init__ 中创建它的实例：

        self.treeServiceSelection = MakeWidget(xml, self)

或者可能将 xml 解析代码分解为以 xml 作为参数的方法。