如何更新/刷新qTreewidget？

Question

我有一个小UI，它列出了给定路径的文本和python脚本文件，但是当我尝试用新项更新或替换列表时，我认为数据被放在那里，但是它们看起来是空白的。我假设这与不告诉UI数据已经更新和UI必须重新绘制有关？在

这是我的代码：

import os
import platform
import shutil
import subprocess
import sys
import time

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Window(QtGui.QWidget):
    def __init__(self):
        super(Window, self).__init__()

        self.fileListerObject = fileListGenerator(self)

        self.setObjectName(_fromUtf8("Form"))
        self.resize(350, 300)

        mainSizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Fixed)
        mainSizePolicy.setHorizontalStretch(0)
        mainSizePolicy.setVerticalStretch(0)
        mainSizePolicy.setHeightForWidth(self.sizePolicy().hasHeightForWidth())

        self.setSizePolicy(mainSizePolicy)
        self.setSizePolicy(mainSizePolicy)

        self.uiName = 'Tree test'
        self.setWindowTitle(self.uiName)

        self.windowElements()

    def windowElements(self):       
        verticalLayout = QtGui.QVBoxLayout(self)
        verticalLayout.setObjectName(_fromUtf8("verticalLayout"))

        self.inputLineEdit = QtGui.QLineEdit(self)
        verticalLayout.addWidget(self.inputLineEdit)

        buttonThing = QtGui.QPushButton(self)
        buttonThing.setText('SET')
        verticalLayout.addWidget(buttonThing)
        self.connect(buttonThing, QtCore.SIGNAL("clicked()"), self.fileListerObject.fileLister)

        self.treeWidget = QtGui.QTreeWidget(self)
        self.treeWidget.setIndentation(5)
        self.treeWidget.setAllColumnsShowFocus(True)
        self.treeWidget.setObjectName(_fromUtf8("treeWidget"))

        self.treeWidget.header().setSortIndicatorShown(True)
        self.treeWidget.header().setSortIndicator(0, QtCore.Qt.AscendingOrder)

        self.treeWidget.setSortingEnabled(True)
        self.treeWidget.headerItem().setText(0, "file name")
        self.treeWidget.headerItem().setText(1, "date")
        self.treeWidget.headerItem().setText(2, "type")
        self.__sortingEnabled = self.treeWidget.isSortingEnabled()
        self.treeWidget.setSortingEnabled(False)

        verticalLayout.addWidget(self.treeWidget)

        buttonLaunchApp = QtGui.QPushButton(self)
        buttonLaunchApp.setText('OPEN')
        verticalLayout.addWidget(buttonLaunchApp)

        self.show()

class fileListGenerator():
    def __init__(self, parentWindow):
        self.parentWindow = parentWindow

    def fileLister(self):
        directoryPath = self.parentWindow.inputLineEdit.text()

        dirPath = directoryPath
        fileList = os.listdir(dirPath)
        projectFileList = []
        if len(fileList) != 0:
            for file in fileList:
                if ( file.endswith('.txt') != False ) or ( file.endswith('.py') != False ):
                    projectFileList.append(file)
        print projectFileList

        itemID = 0
        for item in projectFileList:
            filePath = dirPath + '\\' + item
            threePartSplit = item.rpartition(".")
            extension = threePartSplit[2]
            dateTimeStamp = time.ctime(os.path.getmtime(filePath))
            QDate = QtCore.QDateTime.fromString (str(dateTimeStamp), 'ddd MMM dd HH:mm:ss yyyy')
            QtGui.QTreeWidgetItem(self.parentWindow.treeWidget)
            self.parentWindow.treeWidget.topLevelItem(itemID).setText(0, item)
            self.parentWindow.treeWidget.topLevelItem(itemID).setData(1, QtCore.Qt.DisplayRole, QDate.toString('yyyy-MM-dd HH:mm:ss'))
            self.parentWindow.treeWidget.topLevelItem(itemID).setText(2, extension)
            itemID += 1

        self.parentWindow.treeWidget.setSortingEnabled(self.parentWindow._Window__sortingEnabled)

def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())

run()

我试着查了一下，发现了一个使用qabstractem模型的答案？但据我所知，你只能使用qTreeVIEW，我使用的是widget版本。我对项目中的数据没有做太多的处理，所以我认为我不需要qTreeview，所以我希望将它作为一个小部件保留。这个设置有没有办法让用户界面正确更新数据？或者我需要完全重新格式化吗？在

提前谢谢你。在

Answer 1

QTreeWidgets在添加新项目时更新/重新绘制。因此，添加一个项目，然后删除它，如下所示：

itemYouChanged.parent().removeChild(QTreeWidgetItem(itemYouChanged.parent()))

Answer 2

老实说，我不太明白你的代码。但是，如果您想向QTreeWidget添加新项，请执行以下操作：

item = QTreeWidgetItem()
item.setText(0, "John") # first name
item.setText(1, "Doe") # last name
item.setText(2, "35") # age

self.treeWidget.addTopLevelItem(item)