PyQt5 鼠标事件_qt mousegrabber

1、继承 QWidget 

2、事件捕获

from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QWidget
 
from py_ui.demo import Ui_demo
 
 
class handler_demo(QWidget, Ui_demo):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
 
    def mousePressEvent(self, e):
        if e.button() == Qt.RightButton:
            self.input1.setText("RightButton press")
        elif e.button() == Qt.LeftButton:
            self.input1.setText("LeftButton press")
        elif e.button() == Qt.BackButton:
            self.input1.setText("BackButton press")
        elif e.button() == Qt.ForwardButton:
            self.input1.setText("ForwardButton press")
        elif e.button() == Qt.MiddleButton:
            self.input1.setText("MiddleButton press")
        elif e.button() == Qt.MidButton:
            self.input1.setText("MidButton press")
 
    def mouseReleaseEvent(self, e):
        if e.button() == Qt.RightButton:
            self.input2.setText("RightButton release")
        elif e.button() == Qt.LeftButton:
            self.input2.setText("LeftButton release")
        elif e.button() == Qt.BackButton:
            self.input2.setText("BackButton release")
        elif e.button() == Qt.ForwardButton:
            self.input2.setText("ForwardButton release")
        elif e.button() == Qt.MiddleButton:
            self.input2.setText("MiddleButton release")
        elif e.button() == Qt.MidButton:
            self.input2.setText("MidButton release")
 
        return
 
    def mouseDoubleClickEvent(self, e):
        if e.button() == Qt.RightButton:
            self.input3.setText("RightButton double")
        elif e.button() == Qt.LeftButton:
            self.input3.setText("LeftButton double")
        elif e.button() == Qt.BackButton:
            self.input3.setText("BackButton double")
        elif e.button() == Qt.ForwardButton:
            self.input3.setText("ForwardButton double")
        elif e.button() == Qt.MiddleButton:
            self.input3.setText("MiddleButton double")
        elif e.button() == Qt.MidButton:
            self.input3.setText("MidButton double")
 
        return
 
    def mouseMoveEvent(self, e):
        if e.button() == Qt.RightButton:
            self.input4.setText("RightButton move")
        elif e.button() == Qt.LeftButton:
            self.input4.setText("LeftButton move")
        elif e.button() == Qt.BackButton:
            self.input4.setText("BackButton move")
        elif e.button() == Qt.ForwardButton:
            self.input4.setText("ForwardButton move")
        elif e.button() == Qt.MiddleButton:
            self.input4.setText("MiddleButton move")
        elif e.button() == Qt.MidButton:
            self.input4.setText("MidButton move")
 
        return
 
    def mouseGrabber(self):
        return