PyQT QListWidget 列表项添加、删除与编辑

PyQT开发图形界面的应用时，QListWidget类用于生成列表，可以方便对列表项进行选择，添加，删除，编辑操作。

1. QListWidget 代码实现步骤：

生成QListWidget对象
构建 QListWidgetItem 列表项目对象
对列表项进行添加，删除，修改操作等

2. 准备 PyQT 演示代码框架

1个QListWidget对象，
1个输入控件；
1个添加列表项按钮；
1个删除列表项按钮

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

import sys
 
W_WIDTH = 400
W_HEIGHT = 400
W_X = 725
W_Y = 350
 
 
class CreateButton:
    def __init__(self, window, text, width, height, x, y):
        self.button = QPushButton(window)
        self.button.setText(text)
        self.button.resize(width, height)
        self.button.move(x, y)
 
    def get_instance(self):
        return self.button
 
 
class MyWin(QMainWindow):
    def __init__(self):
        super(MyWin, self).__init__()
        self.init()
        self.show()
 
    def writetextbox(self):
        self.textbox.setPlainText("test")
 
    def textboxcreate(self):
        self.textbox = QPlainTextEdit(self)
        self.textbox.move(150,25)
        self.textbox.resize(75, 25)
 
    def init(self):
        self.resize(W_WIDTH, W_HEIGHT)
        self.move(W_X, W_Y)
        self.setWindowTitle('QlistWidget Example')
        
        self.textbox = QPlainTextEdit(self)
        self.textbox.move(145,5)
        self.textbox.resize(125, 25)
 
        self.button_add_item = CreateButton(self, "Add Item", 120, 25, 275, 5).get_instance()
        self.button_remove_item = CreateButton(self, "Remove Item", 250, 25, 145, 35).get_instance()


 
app = QApplication(sys.argv)
win = MyWin()
sys.exit(app.exec_())

##3. QListWidget 代码实现

3.1 创建 QListWidget对象

self.mylist = QListWidget(self)

3.2 添加列表项

新生成的列表是空的。列表项数据为 QListWidgetItem类的对象
用addItem()方法向列表中添加列表项，
list_item1 = QListWidgetItem(“Pear”)
self.mylist.addItem(list_item1)

在本例中，列表项内容通过 textEdit 输入框输入，单击 button_add_item 按钮后，将输入内容添加至列表中，如果输入框为空，会弹出提示框报错。
将 button_add_item按钮的 clicked 信号绑定到 slot 方法 addItem()

self.button_add_item.clicked.connect(self.additem)

def additem(self):
        if self.textbox.toPlainText() == "" or self.textbox.toPlainText() is None:
            msgbox = QMessageBox()
            msgbox.setIcon(QMessageBox.Critical)
            msgbox.setText("Item cannot be empty")
            msgbox.setWindowTitle("Error")
            msgbox.setStandardButtons(QMessageBox.Ok)
            msgbox.exec()
        else:
            self.mylist.addItem(QListWidgetItem(self.textbox.toPlainText()))
            self.textbox.setPlainText(None)

3.3 删除列表项

选中1个列表项后，单击按钮 button_remove_item ，将删除该列表项
将 button_remove_item 按钮的 clicked 信号绑定到 slot 方法 delItem()

 self.button_remove_item.clicked.connect(self.delitem)
     def delitem(self):
            selected_row = self.mylist.currentRow()
            item = self.mylist.takeItem(selected_row)
            del item

3.4 修改列表项

本例可通过双击列表项对其进行修改。该列表项的flags就先置为Qt.ItemIsEditable。
将QListWidget对象的itemDoubleClicked 信号绑定至 DoubleClicked_to_edit 方法

 self.mylist.itemDoubleClicked.connect(self.DoubleClicked_to_edit)
    def DoubleClicked_to_edit(self, item):
        item.setFlags(item.flags() | Qt.ItemIsEditable)
        if not item.isSelected():
            item.setSelected(True)

3.5 运行项目

4. 完整代码

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

import sys
 
W_WIDTH = 400
W_HEIGHT = 400
W_X = 725
W_Y = 350
 
 
class CreateButton:
    def __init__(self, window, text, width, height, x, y):
        self.button = QPushButton(window)
        self.button.setText(text)
        self.button.resize(width, height)
        self.button.move(x, y)
 
    def get_instance(self):
        return self.button
 
 
class MyWin(QMainWindow):
    def __init__(self):
        super(MyWin, self).__init__()
        self.init()
        self.show()
 
    def writetextbox(self):
        self.textbox.setPlainText("test")
 
    def textboxcreate(self):
        self.textbox = QPlainTextEdit(self)
        self.textbox.move(150,25)
        self.textbox.resize(75, 25)
 
    def init(self):
        self.resize(W_WIDTH, W_HEIGHT)
        self.move(W_X, W_Y)
        self.setWindowTitle('QlistWidget Example')
 
        self.mylist = QListWidget(self)
        self.mylist.setGeometry(5,5,135,250)
 
 
        self.textbox = QPlainTextEdit(self)
        self.textbox.move(145,5)
        self.textbox.resize(125, 25)
 
        self.button_add_item = CreateButton(self, "Add Item", 120, 25, 275, 5).get_instance()
        self.button_add_item.clicked.connect(self.additem)
 
        self.button_remove_item = CreateButton(self, "Remove Item", 250, 25, 145, 35).get_instance()
        self.button_remove_item.clicked.connect(self.delitem)

        self.mylist.itemDoubleClicked.connect(self.DoubleClicked_to_edit)
        
    def additem(self):
        if self.textbox.toPlainText() == "" or self.textbox.toPlainText() is None:
            msgbox = QMessageBox()
            msgbox.setIcon(QMessageBox.Critical)
            msgbox.setText("Item cannot be empty")
            msgbox.setWindowTitle("Error")
            msgbox.setStandardButtons(QMessageBox.Ok)
            msgbox.exec()
        else:
            self.mylist.addItem(QListWidgetItem(self.textbox.toPlainText()))
            self.textbox.setPlainText(None)
                
    def delitem(self):
            selected_row = self.mylist.currentRow()
            item = self.mylist.takeItem(selected_row)
            del item
 
    def DoubleClicked_to_edit(self, item):
        item.setFlags(item.flags() | Qt.ItemIsEditable)
        if not item.isSelected():
            item.setSelected(True)
            
 
app = QApplication(sys.argv)
win = MyWin()
sys.exit(app.exec_())

上述代码支持PyQT5, PyQT6 版本。

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PyQT QListWidget 列表项添加、删除与编辑

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