【PyQt4 实例27】事件过滤器

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# -*- coding: utf-8 -*-from PyQt4.QtGui import *from PyQt4.QtCore import *import sysQTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))class EventFilter(QDialog):    def __init__(self,parent=None):        super(EventFilter,self).__init__(parent)        self.setWindowTitle(self.tr("事件过滤器"))                self.label1 = QLabel(self.tr("请点击"))        self.label2 = QLabel(self.tr("请点击"))        self.label3 = QLabel(self.tr("请点击"))        self.LabelState = QLabel(self.tr("test"))                self.image1 = QImage("image/butterfly.png")        self.image2 = QImage("image/butterfly.png")        self.image3 = QImage("image/butterfly.png")                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:            if event.type() == QEvent.MouseButtonPress:                mouseEvent = QMouseEvent(event)                if mouseEvent.buttons() == Qt.LeftButton:                    self.LabelState.setText(self.tr("Left mouse button pressed on left image"))                elif mouseEvent.buttons() == Qt.MidButton:                    self.LabelState.setText(self.tr("Middle mouse button pressed on left image"))                elif mouseEvent.buttons() == Qt.RightButton:                    self.LabelState.setText(self.tr("Right mouse button pressed on left image"))                matrix = QMatrix()                matrix.scale(0.8,0.8)                tmp = self.image1.transformed(matrix)                self.label1.setPixmap(QPixmap.fromImage(tmp))            if event.type() == QEvent.MouseButtonRelease:                self.LabelState.setText(self.tr("Mouse button released from left image"))                self.label1.setPixmap(QPixmap.fromImage(self.image1))        return QDialog.eventFilter(self,watched,event)    app=QApplication(sys.argv)dialog=EventFilter()dialog.show()app.exec_()
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