PyQt 键盘事件和鼠标事件

import sys
from PyQt5.QtWidgets import QMainWindow, QWidget, QApplication
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    
    def __init__(self, parent = None):
        super().__init__(parent)
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle("鼠标键盘事件示例")
        self.setCentralWidget(QWidget())#指定主窗口中心部件
        self.statusBar().showMessage("ready")#状态栏显示信息
        self.resize(300,185)
    
    #重新实现各事件处理程序
    def keyPressEvent(self, event):
        key = event.key()
        if Qt.Key_A <= key <= Qt.Key_Z:
            if event.modifiers() & Qt.ShiftModifier: #Shift 键被按下
                self.statusBar().showMessage('"Shift+%s" pressed' % chr(key),500)
            elif event.modifiers() & Qt.ControlModifier:  #Ctrl 键被按下
                self.statusBar().showMessage('"Control+%s" pressed' % chr(key),500)
            elif event.modifiers() & Qt.AltModifier:  #Alt 键被按下
                self.statusBar().showMessage('"Alt+%s" pressed' % chr(key),500)
            else:
                self.statusBar().showMessage('"%s" pressed' % chr(key),500)
                
        elif key == Qt.Key_Home:
            self.statusBar().showMessage('"Home" pressed' ,500)
        elif key == Qt.Key_End:
            self.statusBar().showMessage('"End" pressed',500)
        elif key == Qt.Key_PageUp:
            self.statusBar().showMessage('"PageUp" pressed',500)
        elif key == Qt.Key_PageDown:
            self.statusBar().showMessage('"PageDown" pressed',500)
        else:   #其它未设定的情况
            QWidget.keyPressEvent(self, event)  #留给基类处理
        '''
        其它常用按键：
        Qt.Key_Escape,Qt.Key_Tab,Qt.Key_Backspace,Qt.Key_Return,Qt.Key_Enter,
        Qt.Key_Insert,Qt.Key_Delete,Qt.Key_Pause,Qt.Key_Print,Qt.Key_F1...Qt.Key_F12,
        Qt.Key_Space,Qt.Key_0...Qt.Key_9,Qt.Key_Colon,Qt.Key_Semicolon,Qt.Key_Equal
        ...
        '''
    def mousePressEvent(self, event): #鼠标按下事件
        pos = event.pos() #返回鼠标所在点QPoint
        self.statusBar().showMessage('Mouse is pressed at (%d,%d) of widget '% (pos.x(),pos.y()),500)
        globalPos = self.mapToGlobal(pos)
        print('Mouse is pressed at (%d,%d) of screen '% (globalPos.x(),globalPos.y()))
    
    def mouseReleaseEvent(self, event): #鼠标释放事件
        pos = event.pos() #返回鼠标所在点QPoint
        self.statusBar().showMessage('Mouse is released at (%d,%d) of widget '% (pos.x(),pos.y()),500)
        if event.button() == Qt.LeftButton:
            print("左键")
        elif event.button() == Qt.MidButton:
            print("中键")
        elif event.button() == Qt.RightButton:
            print("右键")
   
    def mouseDoubleClickEvent(self, event): #鼠标双击事件
        pos = event.pos() #返回鼠标所在点QPoint
        self.statusBar().showMessage('Mouse is double-clicked at (%d,%d) of widget '% (pos.x(),pos.y()),500)
    def mouseMoveEvent(self, event): #鼠标移动事件
        pos = event.pos() #返回鼠标所在点QPoint
        self.statusBar().showMessage('Mouse is moving at (%d,%d) of widget '% (pos.x(),pos.y()),500)  
        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())