pyqt5 在 tablewidget 中加入 comboBox，并对 comboBox 的修改做出响应
文章目录
- 背景介绍
- 初始代码
-
- UI 代码
- 逻辑代码
- 效果展示
- 低阶修改
- 进阶修改
背景介绍
用例：用 tablewidget 展示查询到的学生信息，为了防止错误修改，让学生的性别项修改时只能是“男”或“女”
效果展示：
初始代码
UI 代码
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'a.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again. Do not edit this file unless you know what you are doing.
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(798, 600)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout_2.setObjectName("verticalLayout_2")
self.verticalLayout = QtWidgets.QVBoxLayout()
self.verticalLayout.setObjectName("verticalLayout")
self.tableWidget = QtWidgets.QTableWidget(self.centralwidget)
self.tableWidget.setObjectName("tableWidget")
self.tableWidget.setColumnCount(0)
self.tableWidget.setRowCount(0)
self.verticalLayout.addWidget(self.tableWidget)
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setObjectName("label")
self.verticalLayout.addWidget(self.label)
self.verticalLayout_2.addLayout(self.verticalLayout)
MainWindow.setCentralWidget(self.centralwidget)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.label.setText(_translate("MainWindow", "TextLabel"))
逻辑代码
import datetime
import sys
import time
from collections import namedtuple
from PyQt5.QtWidgets import QMainWindow, QApplication, QTableWidgetItem, QComboBox
from a import Ui_MainWindow
Student = namedtuple('Student', 'name gender age')
genders = ['男', '女']
class APP(QMainWindow, Ui_MainWindow):
def __init__(self):
super(APP, self).__init__()
self.setupUi(self)
self.setup_tablewidget()
def setup_tablewidget(self):
self.tableWidget.setColumnCount(3)
self.tableWidget.setHorizontalHeaderLabels(['姓名', '性别', '年龄'])
self.tableWidget.cellChanged.connect(self.revise_data)
# 填数据进去；一般是检索数据库得到数据再填进去，但是这里简化，直接录入
student1 = Student('绫波丽', '女', '14')
student2 = Student('明日香', '女', '14')
student3 = Student('碇真嗣', '女', '14')
self.update_tablewidget([student1, student2, student3])
def update_tablewidget(self, students):
# 阻塞信号，防止初始化添加信息的时候触发 revise 函数
self.tableWidget.blockSignals(True)
for i, student in enumerate(students):
self.tableWidget.insertRow(i)
name_item = QTableWidgetItem(student.name)
self.tableWidget.setItem(i, 0, name_item)
cb_gender = QComboBox()
cb_gender.addItems(genders)
cb_gender.setCurrentText(student.gender)
self.tableWidget.setCellWidget(i, 1, cb_gender)
age_item = QTableWidgetItem(student.age)
self.tableWidget.setItem(i, 2, age_item)
self.tableWidget.blockSignals(False)
def revise_data(self, i, j):
revise_str = self.tableWidget.item(i, j).text()
text = f'修改位置：{i} {j}；修改为：{revise_str}'
self.label.setText(text)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = APP()
window.show()
sys.exit(app.exec_())
效果展示
可见修改文本是可以响应的，但是修改 combo box 没有反应：因为修改时 combo box 的 current text，而这个变量本身没有变化，所以 tablewidget 没有检测到 cellChanged ，所以没有反应。
低阶修改
给 combo box 修改信号绑定函数，然后在绑定的函数里面通知 tablewidget 修改；这里的 bug 是：实际修改 combo box 的时候并不会选中该 item，所以有时候会发生修改的是第二项，但软件读到的是第一项这种错误。（注意观察示例中的“修改位置：”，这个打印的结果有时候会对应不上）
import datetime
import sys
import time
from collections import namedtuple
from PyQt5.QtWidgets import QMainWindow, QApplication, QTableWidgetItem, QComboBox
from a import Ui_MainWindow
Student = namedtuple('Student', 'name gender age')
genders = ['男', '女']
class APP(QMainWindow, Ui_MainWindow):
def __init__(self):
super(APP, self).__init__()
self.setupUi(self)
self.setup_tablewidget()
def setup_tablewidget(self):
self.tableWidget.setColumnCount(3)
self.tableWidget.setHorizontalHeaderLabels(['姓名', '性别', '年龄'])
self.tableWidget.cellChanged.connect(self.revise_data)
# 填数据进去；一般是检索数据库得到数据再填进去，但是这里简化，直接录入
student1 = Student('绫波丽', '女', '14')
student2 = Student('明日香', '女', '14')
student3 = Student('碇真嗣', '女', '14')
self.update_tablewidget([student1, student2, student3])
def update_tablewidget(self, students):
# 阻塞信号，防止初始化添加信息的时候触发 revise 函数
self.tableWidget.blockSignals(True)
for i, student in enumerate(students):
self.tableWidget.insertRow(i)
name_item = QTableWidgetItem(student.name)
self.tableWidget.setItem(i, 0, name_item)
cb_gender = QComboBox()
cb_gender.addItems(genders)
cb_gender.setCurrentText(student.gender)
self.tableWidget.setCellWidget(i, 1, cb_gender)
cb_gender.currentIndexChanged.connect(self.cb_in_tw_changed)
age_item = QTableWidgetItem(student.age)
self.tableWidget.setItem(i, 2, age_item)
self.tableWidget.blockSignals(False)
def revise_data(self, i, j):
if j == 1:
revise_str = self.tableWidget.cellWidget(i, j).currentText()
else:
revise_str = self.tableWidget.item(i, j).text()
text = f'修改位置：{i} {j}；修改为：{revise_str}'
self.label.setText(text)
def cb_in_tw_changed(self):
index = self.tableWidget.currentIndex() # todo: 这个是错的
print('current index tablewidget', int(index.row()), int(index.column()))
self.tableWidget.cellChanged.emit(int(index.row()), int(index.column()))
if __name__ == '__main__':
app = QApplication(sys.argv)
window = APP()
window.show()
sys.exit(app.exec_())
进阶修改
为了解决这个问题，我们得直到修改信号是谁发出来的，并且把它的位置存下来，才能知道到底是哪个位置的 combo box 被修改了：（观察修改位置，这次是完全正确的了）
import datetime
import sys
import time
from collections import namedtuple
from PyQt5.QtWidgets import QMainWindow, QApplication, QTableWidgetItem, QComboBox
from a import Ui_MainWindow
Student = namedtuple('Student', 'name gender age')
genders = ['男', '女']
class APP(QMainWindow, Ui_MainWindow):
def __init__(self):
super(APP, self).__init__()
self.cb_in_tw_dict = {}
self.setupUi(self)
self.setup_tablewidget()
def setup_tablewidget(self):
self.tableWidget.setColumnCount(3)
self.tableWidget.setHorizontalHeaderLabels(['姓名', '性别', '年龄'])
self.tableWidget.cellChanged.connect(self.revise_data)
# 填数据进去；一般是检索数据库得到数据再填进去，但是这里简化，直接录入
student1 = Student('绫波丽', '女', '14')
student2 = Student('明日香', '女', '14')
student3 = Student('碇真嗣', '女', '14')
self.update_tablewidget([student1, student2, student3])
def update_tablewidget(self, students):
self.cb_in_tw_dict.clear()
# 阻塞信号，防止初始化添加信息的时候触发 revise 函数
self.tableWidget.blockSignals(True)
for i, student in enumerate(students):
self.tableWidget.insertRow(i)
name_item = QTableWidgetItem(student.name)
self.tableWidget.setItem(i, 0, name_item)
cb_gender = QComboBox()
cb_gender.addItems(genders)
cb_gender.setCurrentText(student.gender)
self.tableWidget.setCellWidget(i, 1, cb_gender)
cb_gender.currentIndexChanged.connect(self.cb_in_tw_changed)
self.cb_in_tw_dict[cb_gender] = (i, 1)
age_item = QTableWidgetItem(student.age)
self.tableWidget.setItem(i, 2, age_item)
self.tableWidget.blockSignals(False)
def revise_data(self, i, j):
if j == 1:
revise_str = self.tableWidget.cellWidget(i, j).currentText()
else:
revise_str = self.tableWidget.item(i, j).text()
text = f'修改位置：{i} {j}；修改为：{revise_str}'
self.label.setText(text)
def cb_in_tw_changed(self):
index = self.cb_in_tw_dict[self.sender()]
self.tableWidget.cellChanged.emit(*index)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = APP()
window.show()
sys.exit(app.exec_())
以上；有问题欢迎评论区交流。