python - 为什么在PyQt中重写mousePressEvent会使点击信号不触发？

该事件未传播，因为您已在处理程序中接受该事件。

您允许需要调用原始处理程序。

FWIW，您可以连接处理程序itemSelectionChanged并selectedItems在表上获取该值，而不用跟踪位置。

import sys
from PyQt5.QtWidgets import (
    QApplication, QWidget, QTableWidget, 
    QTableWidgetItem, QGridLayout
)


class Widget(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()    

    def initUI(self):
        self.setGeometry(300, 300, 300, 220)
        self.setWindowTitle('Simple')

        table = TrackedTableWidget()

        layout = QGridLayout()
        layout.addWidget(table, 0, 0)
        self.setLayout(layout)

        self.show()


class TrackedTableWidget(QTableWidget):
    def __init__(self, *args, **kwargs):
        super().__init__()

        self.initUI()    

    def initUI(self):
        self.setRowCount(2)
        self.setColumnCount(2)
        self.setItem(0, 0, QTableWidgetItem('30', 0));
        self.setItem(0, 1, QTableWidgetItem('40', 0));
        self.setItem(1, 0, QTableWidgetItem('50', 0));
        self.setItem(1, 1, QTableWidgetItem('60', 0));

        self.cellClicked.connect(self._handle_cell_clicked)
        self.itemSelectionChanged.connect(self._handle_item_selection)

    def _handle_cell_clicked(self, row, column):
        print('cell_clicked', row, column)
        print('selected cell positions', self.startingposx, self.endingposx)

    def _handle_item_selection(self, *args):
        print(self.selectedItems())
        print('item_selection', args)

    def mousePressEvent(self, event):
        print('mousePressEvent')
        self.startingposx = event.x()
        super().mousePressEvent(event)

    def mouseReleaseEvent(self, event):
        print('mouseReleaseEvent')
        self.endingposx = event.x()
        super().mouseReleaseEvent(event)

if __name__ == '__main__':

    app = QApplication(sys.argv)
    widget = Widget()

    sys.exit(app.exec_())

参考

• 关于接受事件