事件处理和自定义信号

这个示例只有这一个python文件。

import sys
from PyQt5.QtWidgets import QApplication,QWidget,QLabel
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtGui import QMouseEvent,QFont

class QmyLabel(QLabel):
    doubleClicked=pyqtSignal()#自定义信号

    def mouseDoubleClickEvent(self, event):
        self.doubleClicked.emit()
class QmyWidget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.resize(280,150)
        self.setWindowTitle("Demo5_2,事件与信号")
        LabHello=QmyLabel(self)#父容器是self，也就是窗体
        LabHello.setText("双击我啊")
        font=LabHello.font()
        font.setPointSize(14)
        font.setBold(True)
        LabHello.setFont(font)
        size=LabHello.sizeHint()
        LabHello.setGeometry(70,60,size.width(),size.height())
        LabHello.doubleClicked.connect(self.do_doubleClicked)

    def do_doubleClicked(self):
        print("标签双击了")
    def mouseDoubleClickEvent(self, event):
        print("窗体双击事件响应")
    
if __name__=="__main__":
    # QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)#自适应缩放
    app=QApplication(sys.argv)
    form=QmyWidget()
    form.show()
    sys.exit(app.exec_())