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在事件模型,有三个参与者
事件源
事件对象
事件目标
PyQt5有一个独一无二的信号和槽机制来处理事件。信号和槽用于对象之间的通信。当指定事件发生,一个事件信号会被发射。槽可以被任何Python脚本调用。当和槽连接的信号被发射时,槽会被调用。
import sys from PyQt5.QtCore import Qt from PyQt5.QtWidgets import (QWidget, QLCDNumber, QSlider, QVBoxLayout, QApplication) class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): lcd = QLCDNumber(self) sld = QSlider(Qt.Horizontal, self) vbox = QVBoxLayout() vbox.addWidget(lcd) vbox.addWidget(sld) self.setLayout(vbox) #连接lcd sld.valueChanged.connect(lcd.display) self.setGeometry(300, 300, 250, 150) self.setWindowTitle('Signal & slot') self.show() if __name__ == '__main__': app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_())
按ESC键退出:
import sys from PyQt5.QtCore import Qt from PyQt5.QtWidgets import QWidget, QApplication class Example(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): self.setGeometry(300, 300, 250, 150) self.setWindowTitle('Event handler') self.show() def keyPressEvent(self, e): if e.key() == Qt.Key_Escape: self.close() if __name__ == '__main__': app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_())
触发事件
import sys from PyQt5.QtWidgets import QMainWindow, QPushButton, QApplication class Example(QMainWindow): def __init__(self): super().__init__() self.initUI() def initUI(self): btn1 = QPushButton("Button 1", self) btn1.move(30, 50) btn2 = QPushButton("Button 2", self) btn2.move(150, 50) btn1.clicked.connect(self.buttonClicked) btn2.clicked.connect(self.buttonClicked) self.statusBar() self.setGeometry(300, 300, 290, 150) self.setWindowTitle('Event sender') self.show() def buttonClicked(self): sender = self.sender() self.statusBar().showMessage(sender.text() + ' was pressed') if __name__ == '__main__': app = QApplication(sys.argv) ex = Example() sys.exit(app.exec_())
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