PyQT_QComboBox

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已于 2022-10-19 07:34:50 修改

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文章标签： pyqt

于 2022-10-04 08:42:39 首次发布

本文链接：https://blog.youkuaiyun.com/fukangwei_lite/article/details/127158936

版权

本文详细介绍了PyQt5中QComboBox控件的基础功能及其使用方法，包括如何响应选择变化、启用或禁用控件及设置当前显示内容。

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文章目录

基础功能
currentIndexChanged
setEnabled
setCurrentText

基础功能

dialog_new.py如下：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(416, 321)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(150, 200, 89, 24))
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(100, 110, 51, 16))
        self.label.setObjectName("label")
        self.comboBox_baud = QtWidgets.QComboBox(Form)
        self.comboBox_baud.setGeometry(QtCore.QRect(160, 110, 71, 23))
        self.comboBox_baud.setObjectName("comboBox_baud")
        self.comboBox_baud.addItem("")
        self.comboBox_baud.addItem("")
        self.comboBox_baud.addItem("")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "数据趋势"))
        self.pushButton.setText(_translate("Form", "输出波特率"))
        self.label.setText(_translate("Form", "波特率"))
        self.comboBox_baud.setItemText(0, _translate("Form", "2400"))
        self.comboBox_baud.setItemText(1, _translate("Form", "4800"))
        self.comboBox_baud.setItemText(2, _translate("Form", "9600"))

main.py如下：

import dialog_new
import sys
from PyQt5.QtWidgets import QApplication, QDialog

class Dialog():
    def init(self, mainWindow, mainView):
        self.mainWindow = mainWindow
        self.mainView = mainView
        self.mainView.setupUi(mainWindow)
        self.mainView.pushButton.clicked.connect(self.printClick)

    def printClick(self):
        current_baud = self.mainView.comboBox_baud.currentText()
        print(current_baud)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainDialog = Dialog()
    mainWindow = QDialog()
    mainView = dialog_new.Ui_Form()
    mainDialog.init(mainWindow, mainView)
    mainWindow.show()
    sys.exit(app.exec_())

在这里插入图片描述

currentIndexChanged

当QComboBox的选择框发生变化时，就会发出信号currentIndexChanged。
dialog_new.py如下：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(416, 321)
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(100, 110, 51, 16))
        self.label.setObjectName("label")
        self.comboBox_baud = QtWidgets.QComboBox(Form)
        self.comboBox_baud.setGeometry(QtCore.QRect(160, 110, 71, 23))
        self.comboBox_baud.setObjectName("comboBox_baud")
        self.comboBox_baud.addItem("")
        self.comboBox_baud.addItem("")
        self.comboBox_baud.addItem("")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "数据趋势"))
        self.label.setText(_translate("Form", "波特率"))
        self.comboBox_baud.setItemText(0, _translate("Form", "2400"))
        self.comboBox_baud.setItemText(1, _translate("Form", "4800"))
        self.comboBox_baud.setItemText(2, _translate("Form", "9600"))

main.py如下：

import dialog_new
import sys
from PyQt5.QtWidgets import QApplication, QDialog

class Dialog():
    def init(self, mainWindow, mainView):
        self.mainWindow = mainWindow
        self.mainView = mainView
        self.mainView.setupUi(mainWindow)
        self.mainView.comboBox_baud.currentIndexChanged.connect(self.print_IndexChanged)

    def print_IndexChanged(self):
        current_baud = self.mainView.comboBox_baud.currentText()
        print(current_baud)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainDialog = Dialog()
    mainWindow = QDialog()
    mainView = dialog_new.Ui_Form()
    mainDialog.init(mainWindow, mainView)
    mainWindow.show()
    sys.exit(app.exec_())

在这里插入图片描述

setEnabled

setEnabled用于关闭或使能QComboBox：

self.mainView.comboBox_baud.setEnabled(False)

setCurrentText

setCurrentText设置QComboBox当前的显示内容：

self.mainView.comboBox_baud.setCurrentText("9600")