PyQt5 子窗口鼠标事件失效的问题

Question

我想通过点击一个按钮弹出一个对话框，然后点击对话框上的一个按钮可以显示数据，单独的对话框在点击的时候会发生鼠标事件，得到我想要的结果，但是当我把两个窗口连接起来，对话框能正常弹出，但是我点击鼠标却没有反应了，经调试发现单独对话框点击鼠标能触发鼠标事件，而关联了主窗口后子窗口点击鼠标无法触发事件，请问这是什么原因？该如何解决？

#这是我的主窗口调用的弹出对话框的函数
def accept(self):
    self.dialog = QDialog()
    ui = supply_dialog.Supply_Dialog()
    ui.setupUi(self.dialog)
    self.dialog.show()

#以下是我对话框部分的程序  
from PyQt5 import QtCore, QtGui, QtWidgets
import test_MySQL


class Supply_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(640, 480)
        self.pushButton = QtWidgets.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(480, 330, 71, 41))
        font = QtGui.QFont()
        font.setFamily("Jokerman")
        self.pushButton.setFont(font)
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(40, 0, 81, 31))
        font = QtGui.QFont()
        font.setFamily("MV Boli")
        font.setPointSize(12)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.tableWidget = QtWidgets.QTableWidget(Dialog)
        self.tableWidget.setGeometry(QtCore.QRect(30, 40, 581, 271))
        self.tableWidget.setObjectName("tableWidget")
        self.tableWidget.setColumnCount(9)
        self.tableWidget.setRowCount(0)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(0, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(1, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(2, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(3, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(4, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(5, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(6, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(7, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(8, item)

        self.retranslateUi(Dialog)
        self.pushButton.clicked['bool'].connect(self.accept_test)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.pushButton.setText(_translate("Dialog", "查询"))
        self.label.setText(_translate("Dialog", "供应商表"))
        item = self.tableWidget.horizontalHeaderItem(0)
        item.setText(_translate("Dialog", "Pronum"))
        item = self.tableWidget.horizontalHeaderItem(1)
        item.setText(_translate("Dialog", "Supnum"))
        item = self.tableWidget.horizontalHeaderItem(2)
        item.setText(_translate("Dialog", "Supname"))
        item = self.tableWidget.horizontalHeaderItem(3)
        item.setText(_translate("Dialog", "Suplinkman"))
        item = self.tableWidget.horizontalHeaderItem(4)
        item.setText(_translate("Dialog", "Tel"))
        item = self.tableWidget.horizontalHeaderItem(5)
        item.setText(_translate("Dialog", "Supaddr"))
        item = self.tableWidget.horizontalHeaderItem(6)
        item.setText(_translate("Dialog", "email"))
        item = self.tableWidget.horizontalHeaderItem(7)
        item.setText(_translate("Dialog", "QQ"))
        item = self.tableWidget.horizontalHeaderItem(8)
        item.setText(_translate("Dialog", "URL"))

    def accept_test(self):
        supply = test_MySQL.MySQL()
        result = supply.fecth_date()
        supply.conn.commit()
        supply.conn.close()
        self.tableWidget.setRowCount(len(result))
        for i in range(0, len(result)):
            item = QtWidgets.QTableWidgetItem()
            self.tableWidget.setVerticalHeaderItem(i, item)
        for i in range(0, len(result)):
            for j in range(0, 9):
                self.tableWidget.setItem(i, j, QtWidgets.QTableWidgetItem(result[i][j]))