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  4. QButtonGroup at least one button must be checked.
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QButtonGroup at least one button must be checked.

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  • G Offline
    G Offline
    gozag
    wrote on last edited by
    #1

    I have a QButtonGroup of QCheckboxes and I want to ban unchecking all QCheckBoxes. At least one must always be checked.

    jsulmJ 1 Reply Last reply
    0
    • G gozag

      I have a QButtonGroup of QCheckboxes and I want to ban unchecking all QCheckBoxes. At least one must always be checked.

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @gozag https://doc.qt.io/qt-6/qbuttongroup.html#exclusive-prop

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      G 1 Reply Last reply
      1
      • jsulmJ jsulm

        @gozag https://doc.qt.io/qt-6/qbuttongroup.html#exclusive-prop

        G Offline
        G Offline
        gozag
        wrote on last edited by
        #3

        @jsulm I am saying that at least one must be checked. Not saying that only one can be checked.

        Well what I did is:

        • check when all are checked off
        • when it is remove the button from the group to prevent it from triggering the signals
        • check the button
        • add it back to the group

        Is there no other way?

        jsulmJ 1 Reply Last reply
        0
        • G gozag

          @jsulm I am saying that at least one must be checked. Not saying that only one can be checked.

          Well what I did is:

          • check when all are checked off
          • when it is remove the button from the group to prevent it from triggering the signals
          • check the button
          • add it back to the group

          Is there no other way?

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #4

          @gozag You can connect a slot to https://doc.qt.io/qt-6/qbuttongroup.html#buttonToggled In that slot if "checked" is false check all other buttons. If all other buttons are also not checked then check the button (https://doc.qt.io/qt-6/qabstractbutton.html#checked-prop).

          Not sure there is an easier way.

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          JoeCFDJ 1 Reply Last reply
          1
          • jsulmJ jsulm

            @gozag You can connect a slot to https://doc.qt.io/qt-6/qbuttongroup.html#buttonToggled In that slot if "checked" is false check all other buttons. If all other buttons are also not checked then check the button (https://doc.qt.io/qt-6/qabstractbutton.html#checked-prop).

            Not sure there is an easier way.

            JoeCFDJ Offline
            JoeCFDJ Offline
            JoeCFD
            wrote on last edited by
            #5

            @jsulm I would define a std::bitset to do it for all checkboxes. If its value is 0, check the default one,

            1 Reply Last reply
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