Updating property of sibling when pseudo-element changes

Josef Lintz

Not sure if I'm using the right terminology, so bear with me.

I have a QCheckbox, and a QWidget (it can be a text, button, etc..) somewhere in my form.
I want to know if it's possible to set the QWidget's enabled state, from the QCheckbox's checked pseudo-element.

In C++ code this is what I mean

void on_QCheckbox_stateChanged(int checked)
{
    if(checked == 2)
        ui->QWidget->setEnabled(true);
    else if(checked == 0)
        ui->QWidget->setEnabled(false);
};

Is this possible using only stylesheets?

JonB

@Josef-Lintz
No, because (even if it were possible to read some other widget's state in a different widget, which it is not) stylesheets can do nothing other than visual appearance, they cannot do any kind of "action", such as altering enablement state.

Josef Lintz

I see so you can't change the enabled state, using a stylesheet. That's unfortunate.
Is there a way to change the visual appearance of sibling using another's pseudo-element?

Similar to my C++ example, with a different property than enabled, say,background-color?

JonB

@Josef-Lintz
Stylesheets really are only for changing the visual appearance of elements, nothing more. For example, they can alter how an enabled/disabled item looks, but not whether they are/are disabled.

As I also wrote

(even if it were possible to read some other widget's state in a different widget, which it is not)

so, no, you cannot "change the visual appearance of sibling using another's pseudo-element".

Josef Lintz

As I also wrote

(even if it were possible to read some other widget's state in a different widget, which it is not)

Oh, apologies, I missed that.
That's very unfortunate. Thanks anyway.

JonB

@Josef-Lintz
Not that I have ever used QML, but I understand this is what its "property binding" system is good for. If you were using HTML + CSS, you would have to code this action in JavaScript. In Qt you must do it just the way you showed with a signal/slot action.