python - Pyqt5 查找 QlistWidgetItem 的行

Question

我有一个自定义小部件，它有一个与其关联的按钮。有没有办法，当单击自定义小部件上的按钮时，我可以找出当前自定义小部件在 QListWidget 中的哪一行？

文件

Main_GUI.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(353, 237)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setObjectName("listWidget")
        self.gridLayout.addWidget(self.listWidget, 0, 0, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 353, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Add Item"))

CustomWidget_GUI.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Table_Widget_Insert(object):
    def setupUi(self, Table_Widget_Insert):
        Table_Widget_Insert.setObjectName("Table_Widget_Insert")
        Table_Widget_Insert.resize(278, 66)
        self.horizontalLayout = QtWidgets.QHBoxLayout(Table_Widget_Insert)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(Table_Widget_Insert)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.line = QtWidgets.QFrame(Table_Widget_Insert)
        self.line.setFrameShape(QtWidgets.QFrame.VLine)
        self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.line.setObjectName("line")
        self.horizontalLayout.addWidget(self.line)
        self.pushButton = QtWidgets.QPushButton(Table_Widget_Insert)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)

        self.retranslateUi(Table_Widget_Insert)
        QtCore.QMetaObject.connectSlotsByName(Table_Widget_Insert)

    def retranslateUi(self, Table_Widget_Insert):
        _translate = QtCore.QCoreApplication.translate
        Table_Widget_Insert.setWindowTitle(_translate("Table_Widget_Insert", "Form"))
        self.label.setText(_translate("Table_Widget_Insert", "TextLabel"))
        self.pushButton.setText(_translate("Table_Widget_Insert", "Row Number"))

自定义Widget.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from CustomWidget_GUI import *


class SignalsObject(QObject):
    listWidgetCurrentIndex = pyqtSignal(str)

class CustomListEntry(QWidget):

    def __init__(self, parent=None):
        QWidget.__init__(self,parent)
        self.CustomUi = Ui_Table_Widget_Insert()
        self.CustomUi.setupUi(self)
        self.setUpMainUiFunction()
        self.signals = SignalsObject()

    def setUpMainUiFunction(self):
        self.CustomUi.pushButton.clicked.connect(self.rowNumber)

    def setlabel(self,label):
        self.CustomUi.label.setText(label)

    def setButtonName(self,name):
        self.CustomUi.pushButton.setObjectName(name)

    def rowNumber(self):
        sender = self.sender()
        name = sender.objectName().split("__")
        entryNumber = name[1]

        self.signals.listWidgetCurrentIndex.emit(entryNumber)

主程序.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from Main_GUI import *

from CustomWidget import *




class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        QWidget.__init__(self, parent)
        self.MainUi = Ui_MainWindow()
        self.MainUi.setupUi(self)
        self.setUpMainUiFunction()
        self.listEntryNumber = 0


    def setUpMainUiFunction(self):
        self.MainUi.pushButton.clicked.connect(self.addCustomEntry)


    def addCustomEntry(self):
        self.listEntryNumber = self.listEntryNumber + 1

        CustomWidget = CustomListEntry()
        CustomWidget.setObjectName("entry"+str(self.listEntryNumber))

        CustomWidget.setlabel("Entry Number= "+str(self.listEntryNumber))

        CustomWidget.signals.listWidgetCurrentIndex.connect(self.findListIndex)

        CustomWidget.setButtonName("button__"+ str(self.listEntryNumber))

        myQListWidgetItem = QListWidgetItem(self.MainUi.listWidget)
            #pdb.set_trace()
        myQListWidgetItem.setSizeHint(CustomWidget.sizeHint())

        self.MainUi.listWidget.addItem(myQListWidgetItem)
        self.MainUi.listWidget.setItemWidget(myQListWidgetItem, CustomWidget)

    def findListIndex(self,entryNumber):
        print(entryNumber)
        # items = self.MainUi.feederSchedule_listWidget.findItems("entry"+entryNumber,Qt.MatchExactly)
        items = self.MainUi.listWidget.findChildren(CustomListEntry,"entry"+entryNumber)
        # item = self.MainUi.feederSchedule_listWidget.findItems(items, Qt.MatchRegExp)
        if len(items) > 0:
            for item in items:
                print ("row number of found item =",self.MainUi.listWidget.row(item))


if __name__ == "__main__":
    #os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = MainWindow()
    MainWindow.show()
    sys.exit(app.exec_())

我可以看到它能够找到 QListWidget 中的所有项目，但我似乎无法将我的自定义对象与列出的其中之一进行匹配。这就是我无法找到该行的地方。另外，在我的实际程序中，我将删除行。条目号必须与行号分开

Answer 1

在这种情况下，最好实现一个自定义的 QListWidget，它允许您获取行，小部件不应该知道它属于哪一行，但列表小部件应该知道。

因此，我将创建以下自定义 QListWidget，它发出 clicked_widget 信号，指示发出 clicked 信号的小部件的行号:

clickablelistwidget.py

from PyQt5 import QtCore, QtWidgets

class ClickableListWidget(QtWidgets.QListWidget):
    clicked_widget = QtCore.pyqtSignal(int)

    def append_widget(self, widget_clickable):
        item = QtWidgets.QListWidgetItem()
        self.addItem(item)
        item.setSizeHint(widget_clickable.sizeHint())
        self.setItemWidget(item, widget_clickable)
        if hasattr(widget_clickable, "clicked"):
            if isinstance(widget_clickable.clicked, QtCore.pyqtBoundSignal):
                widget_clickable.clicked.connect(self.on_clicked)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        widget = self.sender()
        gp = widget.mapToGlobal(QtCore.QPoint())
        lp = self.viewport().mapFromGlobal(gp)
        item = self.itemAt(lp)
        row = self.row(item)
        self.clicked_widget.emit(row)

然后修改Main_GUI.py文件以用新类替换QListWidget:

Main_GUI.py

from PyQt5 import QtCore, QtGui, QtWidgets
from clickablelistwidget import ClickableListWidget

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(353, 237)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.listWidget = ClickableListWidget(self.centralwidget) # <---
        self.listWidget.setObjectName("listWidget")
        self.gridLayout.addWidget(self.listWidget, 0, 0, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 353, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Add Item"))

您的自定义小部件已修改，以便在按下按钮时发出单击信号:

CustomWidget.py

import sys
from PyQt5 import QtCore, QtWidgets
from CustomWidget_GUI import Ui_Table_Widget_Insert

class CustomListEntry(QtWidgets.QWidget, Ui_Table_Widget_Insert):
    clicked = QtCore.pyqtSignal()

    def __init__(self, parent=None):
        super(CustomListEntry, self).__init__(parent)
        self.setupUi(self)
        self.setUpMainUiFunction()

    def setUpMainUiFunction(self):
        self.pushButton.clicked.connect(self.clicked)

    def setlabel(self,label):
        self.label.setText(label)

现在可以在主文件中使用了:

Main.py

import sys
from PyQt5 import QtCore, QtWidgets
from Main_GUI import Ui_MainWindow
from CustomWidget import CustomListEntry

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.setUpMainUiFunction()

    def setUpMainUiFunction(self):
        self.pushButton.clicked.connect(self.addCustomEntry)
        self.listWidget.clicked_widget.connect(self.on_clicked_widget)

    @QtCore.pyqtSlot()
    def addCustomEntry(self):
        listEntryNumber = self.listWidget.count()
        custom_widget = CustomListEntry()
        custom_widget.setlabel("Entry Number= {}".format(listEntryNumber))
        self.listWidget.append_widget(custom_widget)

    @QtCore.pyqtSlot(int)
    def on_clicked_widget(self, row):
        print("row number of found item = {}".format(row))

if __name__ == "__main__":
    #os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = MainWindow()
    MainWindow.show()
    sys.exit(app.exec_())

最后您的文件夹必须具有以下结构:

├── clickablelistwidget.py
├── CustomListWidget.py
├── CustomWidget_GUI.py
├── CustomWidget.py
├── Main_GUI.py
└── Main.py

<小时/>

此方法的优点是它解耦了类，使其易于重用。您不必求助于 objectName 或将 QListWidgetItem 注入(inject)到小部件中，如果我们有多种类型的小部件，这可能会很乏味。 :-)。