从子类 QComboBox 获取信号时出现问题

Question

我希望能够从子类 QComboBox 发送自定义信号。 我的测试代码如下： 目前我什么也没得到，什么也没有。 这必须是显而易见的，但我看不到解决方案。任何帮助表示赞赏。

import sys
from PyQt6.QtWidgets import QApplication, QComboBox, QDialog
from PyQt6.QtCore import QRect, pyqtSignal,  QMetaObject

def happyDays(index):
    print('May you receive {index} million dollars in the mail')

    
class MyComboBox(QComboBox): #combo box

    signal = pyqtSignal(int)
    
    def __init__(self, parent):
        super(MyComboBox, self).__init__(parent)
        self.setFocus()
        self.setEditable(True)
        self.setGeometry(QRect(5, 0, 240, 50))
        self.signal.connect(happyDays)
         
    def currentIndexChanged(self, index):
        #emit a signal when combobox selection changes
        print('click!')
        self.signal.emit(index)
        

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(250, 50)
        Dialog.setWindowTitle("MyCombo Signal Test")
        QMetaObject.connectSlotsByName(Dialog)


class Dialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        combo = MyComboBox(self)
        items = ['Invertebrate','Fish','Amphibian','Reptile','Bird','Mammal', 'N/A']
        print(items)
        combo.addItems(items)
        

if __name__ == "__main__":

    app = QApplication(sys.argv)
    widget = Dialog()
    widget.show()
    sys.exit(app.exec())       

我尝试重命名“currentIndexChanged”方法，但我认为它应该重写基类方法，如图所示。我已经检查过 QComboBox 应根据文档发出“currentIndexChanged”信号。我可能把信号和槽弄混了。一个小时后，我感到茫然和困惑。

Answer 1

我更改了您的

MyComboBox

并将处理程序连接到其

currentIndexChanged

信号：

class MyComboBox(QComboBox): #combo box

    signal = pyqtSignal(int)
    
    def __init__(self, parent):
        super(MyComboBox, self).__init__(parent)
        self.setFocus()
        self.setEditable(True)
        self.setGeometry(QRect(5, 0, 240, 50))
        self.signal.connect(happyDays)
        self.currentIndexChanged.connect(lambda i: self.signal.emit(i))