PyQt5 Qtablewidget 和连接按钮

Question

我创建了一个 Qtablewidget 作为一个类，并创建了一个 add_button 来添加行，一个 delete_button 来从表中向上删除行。我想将功能连接到按钮，但它不能正常工作。我已经使用 getattr 方法调用该函数，但仍然不起作用。

桌子

为了解释更多，这些脚本行给出了属性错误。当它们被 button.clicked.connect 方法调用时。

add_button.clicked.connect(self._addrow)
delete_button.clicked.connect(self._removeItem)

脚本如下：

import sys
from PyQt5 import QtCore, QtGui, QtWidgets, Qt


class loadtable(QtWidgets.QTableWidget):
    def __init__(self, parent=None):
        super(loadtable, self).__init__(parent)

        self.setColumnCount(5)
        self.setRowCount(1)
        self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))   
        headertitle = ("A","B","C","D","E")
        self.setHorizontalHeaderLabels(headertitle)
        self.verticalHeader().setVisible(False)
        self.horizontalHeader().setHighlightSections(False)
        self.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Fixed)
        self.setSelectionMode(QtWidgets.QAbstractItemView.NoSelection)
        self.setColumnWidth(0, 130)
        combox_lay = QtWidgets.QComboBox(self)
        combox_lay.addItems(["I","II"])
        self.setCellWidget(0, 4, combox_lay)


        self.cellChanged.connect(self._cellclicked)
        #self.cellChanged.connect(self._addrow)
        #self.cellDoubleClicked.connect(self._removerow)

    def _cellclicked(self):
        self.value = self.currentItem()
        self.value.setTextAlignment(Qt.AlignCenter)
        #if self.value is not None:
           #return self.value.setTextAlignment(Qt.AlignCenter)        

    def _addrow(self):
        rowcount = self.rowCount()
        print(rowcount)
        self.setRowCount(rowcount+1)
        combox_add = QtWidgets.QComboBox(self)
        combox_add.addItems(["I","II"])
        self.setCellWidget(rowcount, 4, combox_add)

    def _removerow(self):
        self.removeRow(1)


class thirdtabloads(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(thirdtabloads, self).__init__(parent)      
        table = loadtable()


        button_layout = QtWidgets.QVBoxLayout()
        add_button = QtWidgets.QPushButton("Add")
        add_button.clicked.connect(self._addrow)
        delete_button = QtWidgets.QPushButton("Delete")
        delete_button.clicked.connect(self._removeItem)
        button_layout.addWidget(add_button, alignment=QtCore.Qt.AlignBottom)
        button_layout.addWidget(delete_button, alignment=QtCore.Qt.AlignTop)


        tablehbox = QtWidgets.QHBoxLayout()
        tablehbox.setContentsMargins(10,10,10,10)
        tablehbox.addWidget(table)

        grid = QtWidgets.QGridLayout(self)
        grid.addLayout(button_layout, 0, 1)
        grid.addLayout(tablehbox, 0, 0)        



if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = thirdtabloads()
    w.show()
    sys.exit(app.exec_())

Answer 1

要添加一行你必须使用insertRow()，要删除最后一行使用removeRow()并传递最后一行，记住编号从0开始所以最后一行是self.rowCount() - 1.

另一方面，你的连接不正确，我问你：谁拥有插槽 _addrow() 和 _removerow()？ 属于 LoadTable，所以要访问它们，我们需要一个对象类，即table._addrow和table._removerow。

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class LoadTable(QtWidgets.QTableWidget):
    def __init__(self, parent=None):
        super(LoadTable, self).__init__(1, 5, parent)
        self.setFont(QtGui.QFont("Helvetica", 10, QtGui.QFont.Normal, italic=False))   
        headertitle = ("A","B","C","D","E")
        self.setHorizontalHeaderLabels(headertitle)
        self.verticalHeader().hide()
        self.horizontalHeader().setHighlightSections(False)
        self.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Fixed)

        self.setSelectionMode(QtWidgets.QAbstractItemView.NoSelection)
        self.setColumnWidth(0, 130)

        combox_lay = QtWidgets.QComboBox(self)
        combox_lay.addItems(["I","II"])
        self.setCellWidget(0, 4, combox_lay)

        self.cellChanged.connect(self._cellclicked)

    @QtCore.pyqtSlot(int, int)
    def _cellclicked(self, r, c):
        it = self.item(r, c)
        it.setTextAlignment(QtCore.Qt.AlignCenter)        

    @QtCore.pyqtSlot()
    def _addrow(self):
        rowcount = self.rowCount()
        self.insertRow(rowcount)
        combox_add = QtWidgets.QComboBox(self)
        combox_add.addItems(["I","II"])
        self.setCellWidget(rowcount, 4, combox_add)

    @QtCore.pyqtSlot()
    def _removerow(self):
        if self.rowCount() > 0:
            self.removeRow(self.rowCount()-1)


class ThirdTabLoads(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(ThirdTabLoads, self).__init__(parent)    

        table = LoadTable()

        add_button = QtWidgets.QPushButton("Add")
        add_button.clicked.connect(table._addrow)

        delete_button = QtWidgets.QPushButton("Delete")
        delete_button.clicked.connect(table._removerow)

        button_layout = QtWidgets.QVBoxLayout()
        button_layout.addWidget(add_button, alignment=QtCore.Qt.AlignBottom)
        button_layout.addWidget(delete_button, alignment=QtCore.Qt.AlignTop)


        tablehbox = QtWidgets.QHBoxLayout()
        tablehbox.setContentsMargins(10, 10, 10, 10)
        tablehbox.addWidget(table)

        grid = QtWidgets.QGridLayout(self)
        grid.addLayout(button_layout, 0, 1)
        grid.addLayout(tablehbox, 0, 0)        


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = ThirdTabLoads()
    w.show()
    sys.exit(app.exec_())