How to read QCheckbox state from QTableWidget-CodePudding

I am adding a QCheckBox item to one of the cells in my QTableWidget using the following:

cell_widget = QWidget()
chk_bx = QCheckBox()
chk_bx.setCheckState(QtCore.Qt.Unchecked)
lay_out = QHBoxLayout(cell_widget)
lay_out.addWidget(chk_bx)
lay_out.setAlignment(QtCore.Qt.AlignCenter)
lay_out.setContentsMargins(0,0,0,0)
cell_widget.setLayout(lay_out)
self.definedEventsTable.setCellWidget(row, select_column, cell_widget)

The variable definedEventsTable is a QTableWidget.

The above code works fine and the checkbox is correctly displayed on the GUI and is checkable. Nothing wrong there.

However, when I try to read whether or not it is checked, I cannot seem to be able to do so. Here is what I have tried:

self.definedEventsTable.item(row, select_column)
self.definedEventsTable.itemAt(row, select_column)
self.definedEventsTable.cellWidget(row, select_column)

Each of these return None and therefore cannot run isChecked(). What am I doing wrong?

EDIT

Apologies, it appears that the following is working. Clearly I fumbled around or something.

self.definedEventsTable.cellWidget(row, select_column)

However, it returns a QWidget. How can I get the QCheckbox?

CodePudding user response：

The cellWidget method returns the widget set in the cell, which in your case is "cellWidget" so there are several options to obtain the associated QCheckBox:

- Use findChild

cell_widget = self.definedEventsTable.cellWidget(row, select_column)
checkbox = cell_widget.findChild(QCheckBox)
if checkbox:
    print(checkbox)

- Custom Attribute

cell_widget = QWidget()
chk_bx = QCheckBox()
chk_bx.setCheckState(QtCore.Qt.Unchecked)
lay_out = QHBoxLayout(cell_widget)
lay_out.addWidget(chk_bx)
lay_out.setAlignment(QtCore.Qt.AlignCenter)
lay_out.setContentsMargins(0,0,0,0)
cell_widget.checkbox = chk_bx
self.definedEventsTable.setCellWidget(row, select_column, cell_widget)

Then:

cell_widget = self.definedEventsTable.cellWidget(row, select_column)
if hasattr(cell_widget, "checkbox"):
    checkbox = cell_widget.checkbox
    print(checkbox)

- Custom QWidget

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

        self.chk_bx = QCheckBox()
        self.chk_bx.setCheckState(QtCore.Qt.Unchecked)
        lay_out = QHBoxLayout(self)
        lay_out.addWidget(self.chk_bx)
        lay_out.setAlignment(QtCore.Qt.AlignCenter)
        lay_out.setContentsMargins(0,0,0,0)

cell_widget = Widget()
self.definedEventsTable.setCellWidget(row, select_column, cell_widget)

Then:

cell_widget = self.definedEventsTable.cellWidget(row, select_column)
checkbox = cell_widget.chk_bx
print(checkbox)