Disable user to click over QTableWidget

问题:

I have QTableWidget with CheckBoxes in some cells. I want to disable user to perform mouse click over the table cells (so he can't change checkBox state) for some time while I am using data from the table. I've tried table.setDisabled(1) but that disables whole table and I need scroll to be enabled.

Any help would be appreciated.

EDIT To be more precise: there could be up to 15x3000 cells in table, filled with text(editable), checkbox(checkable), svg graphic(opens other window when double click on it) or some custom widgets(which also have clickable or editable parts). I need to disable user to click or double click over cells(so he can't change any of them) for 1sec - 10sec time interval (solution must be something fast, not iterating through all items), but I need scroll-bar to be enabled and normal table visibility.

回答1:

One way to achieve this is to subclass QTableWidgetItem and re-implement the setData method. That way, you can control whether items accept values for certain roles.

To control the "checkability" for all items, you could add a class attribute to the subclass which could be tested whenever a value for the check-state role was passed to setData.

Here's what the subclass might look like:

class TableWidgetItem(QtGui.QTableWidgetItem):
    _blocked = True

    @classmethod
    def blocked(cls):
        return cls._checkable

    @classmethod
    def setBlocked(cls, checkable):
        cls._checkable = bool(checkable)

    def setData(self, role, value):
        if role != QtCore.Qt.CheckStateRole or self.checkable():
            QtGui.QTableWidgetItem.setData(self, role, value)

And the "checkability" of all items would be disabled like this:

    TableWidgetItem.setCheckable(False)

UPDATE:

The above idea can be extended by adding a generic wrapper class for cell widgets.

The classes below will block changes to text and check-state for table-widget items, and also a range of keyboard and mouse events for cell widgets via an event-filter (other events can be blocked as required).

The cell-widgets would need to be created like this:

    widget = CellWidget(self.table, QtGui.QLineEdit())
    self.table.setCellWidget(row, column, widget)

and then accessed like this:

    widget = self.table.cellWidget().widget()

Blocking for the whole table would be switched on like this:

    TableWidgetItem.setBlocked(True)
    CellWidget.setBlocked(True)
    # or Blockable.setBlocked(True)

Here are the classes:

class Blockable(object):
    _blocked = False

    @classmethod
    def blocked(cls):
        return cls._blocked

    @classmethod
    def setBlocked(cls, blocked):
        cls._blocked = bool(blocked)

class TableWidgetItem(Blockable, QtGui.QTableWidgetItem):
    def setData(self, role, value):
        if (not self.blocked() or (
            role != QtCore.Qt.EditRole and
            role != QtCore.Qt.CheckStateRole)):
            QtGui.QTableWidgetItem.setData(self, role, value)

class CellWidget(Blockable, QtGui.QWidget):
    def __init__(self, parent, widget):
        QtGui.QWidget.__init__(self, parent)
        self._widget = widget
        layout = QtGui.QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.addWidget(widget)
        widget.setParent(self)
        widget.installEventFilter(self)
        if hasattr(widget, 'viewport'):
            widget.viewport().installEventFilter(self)
        widget.show()

    def widget(self):
        return self._widget

    def eventFilter(self, widget, event):
        if self.blocked():
            etype = event.type()
            if (etype == QtCore.QEvent.KeyPress or
                etype == QtCore.QEvent.KeyRelease or
                etype == QtCore.QEvent.MouseButtonPress or
                etype == QtCore.QEvent.MouseButtonRelease or
                etype == QtCore.QEvent.MouseButtonDblClick or
                etype == QtCore.QEvent.ContextMenu or
                etype == QtCore.QEvent.Wheel):
                return True
        return QtGui.QWidget.eventFilter(self, widget, event)

回答2:

Just iterate through all QStandardItems and change flags values for items which should not be changeable.
You can use flag: Qt::ItemIsEditable or/and Qt::ItemIsEnabled.

回答3:

You would need to disable the items themselves as opposed to the whole table if you have other items than QCheckBoxes that you would not like to disable. See the python code below for details:

'''
    Iterate through all the check boxes in the standard items
    and make sure the enabled flag is cleared so that the items are disabled
'''
for standardItem in standardItems:
    standardItem.setFlags(standardItem.flags() & ~Qt.ItemIsEnabled)

Here you can find the corresponding documentation:

void QTableWidgetItem::setFlags(Qt::ItemFlags flags)

Sets the flags for the item to the given flags. These determine whether the item can be selected or modified.