tristate | A Scala Option with both implicit and explicit None

I want to use a QGroupBox which will be checkable, but i don't the content widgets of QGroupBox to be disabled when the QGroupBox checkbox is Unchecked.

From reference:

checked : bool This property holds whether the group box is checked

If the group box is checkable, it is displayed with a check box. If the check box is checked, the group box's children are enabled; otherwise, the children are disabled and are inaccessible to the user.

By default, checkable group boxes are also checked.

I want to have a checkbox in QGroupBox title bar, but i don't want the above feature to be applied.

The checkbox logic will be select-all, select-none, so when the checkbox is unselected the user can modify inner QGroupBox checkbox elements.

I want to keep an interface-ui like the following:

Maybe i have to use a QFrame with QPaintEvent or QSS stylesheet, but i am not expert with this.

Edit: I also want triState for QGroupBox checkbox if possible.

Edit 2: I try this code:

Is overloading of implicit type conversion possible for enumerations in Delphi?

I am using this great library Tabulator, all works fine but I would like to make my code more efficient so I want make one headerMenu function for set desired value to each column in table. Now I am using separate function for each column and it is working fine but there are 8 routines for each field...

I am trying to do this in one function like this:

I need help if it is possible to modify table data before load into table in Tabulator library. I need to convert decimal value of (8 poles)DIP switch to separate 8 bits and load it to table. I have data in json format like this:

I need to rebuild my listview because it is only maintaining the first build, unless I reset the app. I have a bottom sheet pop up that lets me select times and navigate me to a new page where the listview.builder builds. If I back out of the page, select new options, and go back into the page, it does not update. Here is an example:

Relevant Code:

Please help ! I have two checkbox in table row. First checkBox is clickable but the second are not clickable.

I used this code for loading a new page but it does nothing! Is it related to StatefulWidget? (MaterialButton is under a stful widget)

The COVID-19 tracking project (api described here) provides data on many aspects of the pandemic. Each row of the JSON is one day's data for one state. As many people know, the pandemic is hitting different states differently -- New York and its neighbors hardest first, with other states being hit later. Here is a subset of the data:

I am writing a subclass of QCheckBox that I would like to display to the user for checking or unchecking a set of existing check boxes. It works by reacting on the toggled(bool) signals of the check boxes.

The "master" check box must be a tristate check box. When some of the "slave" check boxes are checked but not all of them, the master is set to Qt::CheckState::PartiallyChecked.

It doesn't work well enough. Although I want to set the master check box to "partially checked" within my code, the user should not be able to do that. Clicking onto the master check box should completely check all check boxes except if all of them are already checked. In that case it should uncheck them all. Yet, my master check box also switches to the intermediate state when I click onto it.

I guess that I can change that by overriding void QAbstractButton::checkStateSet() and void QAbstractButton::nextCheckState(), but I do not understand the documentation of these methods. What should they do? And how can I override them to get the expected behaviour?