Is there a signal for "see if any existing QCheckBoxes have changed state"?

Dummie1138

Hi. I have some checkboxes in a QTable that are created when the user adds more data.

I want to be able to send a signal whenever any of these boxes are checked/unchecked. Is there a signal for this? I know there's a signal for each individual box, but I'm building and destroying the boxes quickly so I don't think I can use this method. I haven't figured out a good alternate way of doing this yet. Please let me know if more information is required.

JonB

@Dummie1138

Is there a signal for "see if any existing QCheckBoxes have changed state"?

No. There is a signal for each box changing, or you can iterate the boxes comparing them to previously-stored state to see whether any have changed.

but I'm building and destroying the boxes quickly so I don't think I can use this method.

Something wrong here: if the buttons really were destroyed "quickly" there would not be any point having them/the user would not get a chance to interact with them.

There is a QButtonGroup Class for logically grouping buttons like QCheckBoxes together, but I don't think it would help for your requirement, other than perhaps as a logical starting point.

Dummie1138

@JonB

if the buttons really were destroyed "quickly" there would not be any point having them/the user would not get a chance to interact with them.

Ok, maybe not that quickly.

Iteration is an option but I am not sure if I wanna have some iterating code going through the checked boxes' state running in the background all the time.

JonB

@Dummie1138
I really do not understand what you are trying to achieve.

If you want to run code (immediately) on any (one) checkbox changing state, do it in a slot.
For that, connect signal/slot for each checkbox. They can all connect to same slot if desired. If you do not want to connect each checkbox to a slot, you can presumably achieve this alternatively via an eventFilter.
If you want to run code "periodically" to examine current state of multiple checkboxes and compare against state previously saved, do it on e.g. a timer or whenever in your code, iterating the boxes to see their state.

Chris Kawa

@Dummie1138 If those checkboxes are just checkable items then model sends a dataChanged signal whenever an item is modified. If you connect to it you can check roles.contains(Qt::CheckStateRole) to see if it's the check state that changed.