为什么一旦用户选择了其中一个项目，QlistWidget 中的项目就会一直关注它

Question

一旦用户选择系统显示其内容的项目之一，我有一个代码会在 QlistWidget 中显示引用文件路径的项目。

问题在于，一旦用户选择了其中一项，它就会将焦点保持在该项上，而用户无法选择其他项。

下图显示两个项目都有焦点，这意味着当我尝试选择第二个项目时，我必须取消选择第一个项目，反之亦然。

如何解决这个问题？

示例：

• C:\Users\test\Desktop\New Microsoft Word Document.docx 行 =>0
• C:\Users\test\Desktop\test_arabic.docx 行 =>1

控制台显示结果：

当前行 = 0 这是 P==>C:\Users\test\Desktop\test_arabic.docx 这是 oneDir==>C:\Users\test 这是当前项目 ==C:\Users\test\Desktop\New Microsoft Word Document.docx

当前行 = 1 这是 P==>C:\Users\test\Desktop\test_arabic.docx 这是 oneDir==>C:\Users\test 这是当前项目 ==C:\Users\test\Desktop\New Microsoft Word Document.docx

如果用户选择两次相同的项目，系统会显示此错误：

mouseHover toolTipResult = self.listWidgetPDFlist.setToolTip(Item)

builtins.UnboundLocalError: 之前引用的局部变量 'Item' 作业

代码：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import (QMimeData)
from PyQt5.QtWidgets import (QApplication, QCheckBox, QColorDialog, QDialog,
                             QErrorMessage, QFileDialog, QFontDialog, QFrame, QGridLayout,
                             QInputDialog, QLabel, QLineEdit, QMessageBox, QPushButton, QMenu,QListWidgetItem)

#from PyQt5.QtCore import QDir, Qt
from PyQt5.QtWidgets import *
import pdfviewer
import pathlib
from pathlib import Path
import os
import re
from os import path
import json,datetime,time
from collections import defaultdict

import docx

import PyPDF2


class pdfViewer(pdfviewer.Ui_PdfPreviewWindow):

    def __init__(self,PdfPreviewObj):
        pdfviewer.Ui_PdfPreviewWindow.__init__(self)

        self.PdfPreviewObj =PdfPreviewObj 
        self.setupUi(PdfPreviewObj)
        self.PdfPreviewObj.show()

        '''
        buttons status at the init of the program
        '''
        self.pushButtonSearch.setEnabled(False)    
        rMyIcon = QtGui.QPixmap("checkBox.ico");
        self.SelectAll.setIcon(QtGui.QIcon(rMyIcon))
        self.SelectAll.setEnabled(False)


        self.pushButtonOpenFolder.clicked.connect(self.openfolder)
        self.ExportButton.clicked.connect(self.openExport)        
        self.pushButtonSearch.clicked.connect(self.FilteredListSearch)
        self.listWidgetPDFlist.clicked.connect(self.MatchFunc)
        self.listWidgetPDFlist.doubleClicked.connect(self.OpenTheSelectedFile)
        #self.NewClearList.clicked.connect(self.NewClearListFN)
        self.SelectAll.clicked.connect(self.selectAllFN)

    def mouseHover(self):
        p = pathlib.Path(self.fullPath) 
        print("MouseHover this is P==>{}".format(p))
        oneDir = os.path.join(*p.parts[:-2])
        print("MouseHover this is oneDir==>{}".format(oneDir))  

        if self.listWidgetPDFlist.selectedItems():
            Item = oneDir + "\\" + self.listWidgetPDFlist.selectedItems()[0].text()
            print("MouseHover this is the cuurent Item =={}".format(Item))   

        self.listWidgetPDFlist.setStyleSheet("""QToolTip { 
                                   background-color: black; 
                                   color: white;                            
                                   border-radius: 10px;
                                   border: black solid 1px;
                                   font: 12px
                                   }""")

        print("current row = {}".format(self.listWidgetPDFlist.currentRow()))

        toolTipResult = self.listWidgetPDFlist.setToolTip(Item)
        return toolTipResult

    def FileListSelected(self):             # Function to select the desired file from the list in the left pane
        self.mouseHover()
        p = pathlib.Path(self.fullPath) 
        print("this is P==>{}".format(p))
        oneDir = os.path.join(*p.parts[:-2])
        print("this is oneDir==>{}".format(oneDir))  

        if self.listWidgetPDFlist.selectedItems():
            Item = oneDir + "\\" + self.listWidgetPDFlist.selectedItems()[0].text()
            print("this is the cuurent Item =={}".format(Item))   
            return Item

        else:
            print("<b>!!! NO SELECTED FILE !!!</b>\n")

 def checkPath(self,folder):         # Funtion to check the given path for the wanted extension (Files)

        try:
            directory=folder

            whichChecked=""
            for root,dirs,files in os.walk(directory):

                for filename in files:
                    if len(self.lineEdit_Ext.text())>0:
                        self.lineEdit_Ext.setStyleSheet("background-color:white")
                        self.lineEdit_Ext.setPlaceholderText("Enter The Filetype Extention Here")

                        if filename.endswith(self.lineEdit_Ext.text()):
                            fullPath=os.path.join(root,filename)
                            print(fullPath)
                            self.fileList.append(fullPath)

                    elif self.rdBtn_txt.isChecked() and filename.endswith("txt"):
                        fullPath=os.path.join(root,filename)
                        self.fileList.append(fullPath)
                        whichChecked="txt Ext was Selected"


                    elif self.rdBtn_pdf.isChecked() and filename.endswith("pdf"):
                        fullPath=os.path.join(root,filename)
                        self.fileList.append(fullPath)
                        whichChecked="pdf Ext was Selected"
                    elif self.rdBtn_docx.isChecked() and filename.endswith("docx") or filename.endswith("doc") :
                        self.fullPath=os.path.join(root,filename)

                        p = pathlib.Path(self.fullPath)
                        oneDir = os.path.join(*p.parts[-2:])                    
                        self.fileList.append(oneDir)                        
                        #self.fileList.append(self.fullPath)
                        whichChecked="docx - doc Ext was Selected"

                    if len(self.fileList) > 0:
                        self.lineEdit_Ext.setStyleSheet("bacground-color:white;")
                        self.lineEdit_Ext.setPlaceholderText("{0}".format(whichChecked))
                    else:
                        self.lineEdit_Ext.setStyleSheet("background-color:Red")
                        self.lineEdit_Ext.setPlaceholderText("No Ext is Specified")                            


            self.ListFilesInViewer(self.fileList)           # add the list into the  listWidgetPDFlist 
            self.pushButtonSearch.setEnabled(True)
            self.SelectAll.setEnabled(True)

            return folder

        except Exception as e:
            print("this error occure {0}".format(e))

Answer 1

我猜您将 listWidgetPDFlist 设置为您想要 SingleSelection 的 selectionMode MultipleSelection。这可以在 Qt Designer 中或通过代码更改，如下例所示。

import sys
from PyQt5 import QtWidgets

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = QtWidgets.QListWidget()
    for i in range(10):
        w.addItem('Item {}'.format(i))
    # w.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)  # Multiple selection via control key        
    # w.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)  # Multiple selection (click toggle)
    w.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)  # Single selection
    w.show()
    sys.exit(app.exec_())