-- coding: utf-8 --
from PyQt5.QtGui import * from PyQt5.QtCore import * from PyQt5.QtWidgets import * import sys
class EventFilter(QDialog): def init(self, parent=None): super(EventFilter, self).init(parent) self.setWindowTitle("事件过滤器")
代码语言：javascript复制 self.label1 = QLabel("请点击")
self.label2 = QLabel("请点击")
self.label3 = QLabel("请点击")
self.LabelState = QLabel("test")
self.image1 = QImage("images/cartoon1.ico")
self.image2 = QImage("images/cartoon1.ico")
self.image3 = QImage("images/cartoon1.ico")
self.width = 600
self.height = 300
self.resize(self.width, self.height)
self.label1.installEventFilter(self)
self.label2.installEventFilter(self)
self.label3.installEventFilter(self)
mainLayout = QGridLayout(self)
mainLayout.addWidget(self.label1, 500, 0)
mainLayout.addWidget(self.label2, 500, 1)
mainLayout.addWidget(self.label3, 500, 2)
mainLayout.addWidget(self.LabelState, 600, 1)
self.setLayout(mainLayout)
def eventFilter(self, watched, event):
if watched == self.label1: # 只对label1的点击事件进行过滤，重写其行为，其他的事件会被忽略
if event.type() == QEvent.MouseButtonPress: # 这里对鼠标按下事件进行过滤，重写其行为
mouseEvent = QMouseEvent(event)
if mouseEvent.buttons() == Qt.LeftButton:
self.LabelState.setText("按下鼠标左键")
elif mouseEvent.buttons() == Qt.MidButton:
self.LabelState.setText("按下鼠标中间键")
elif mouseEvent.buttons() == Qt.RightButton:
self.LabelState.setText("按下鼠标右键")
'''转换图片大小'''
transform = QTransform()
transform.scale(0.5, 0.5)
tmp = self.image1.transformed(transform)
self.label1.setPixmap(QPixmap.fromImage(tmp))
if event.type() == QEvent.MouseButtonRelease: # 这里对鼠标释放事件进行过滤，重写其行为
self.LabelState.setText("释放鼠标按钮")
self.label1.setPixmap(QPixmap.fromImage(self.image1))
return QDialog.eventFilter(self, watched, event) # 其他情况会返回系统默认的事件处理方法。if name == 'main': app = QApplication(sys.argv) dialog = EventFilter() dialog.show() sys.exit(app.exec_())
