Question

In my project I am using a custom circle-shaped button widget derived from the QWidget class. I have added several of these widgets to a parent widget.

When one of these custom buttons is clicked, how do I find out which one was clicked?

Adding custom button to parent widget:

void ShotViewCTRL::addShot(QString shotNanme)
{
    ShotButton *btnShot=new ShotButton(this);
    btnShot->shotName=shotNanme;

    connect(btnShot,SIGNAL(Shot_Selected()),this,SLOT(SHOT_CLICKED()));
    btnShot->CreateButton();
    btnShot->show();

}

My parent widget is ShotViewCTRL (inherits from QWidget), the child widget is ShotButton (custom control, inherits from QWidget).

The control is working fine. It’s sending sending to parent object. In my problem, I added the same custom control 10 times.

I need to find which control was clicked? Please help me find the solution.

I have referred to the Qt documentation to find the child widget, but I did’t understand. Some sample code would be great.

Answer 1

QSignalMapper is what you are looking for. With QSignalMapper, you can add something like an Id (or even a pointer to the QButton itself) as additional data to the signal emittance and you have to adjust your slot so it takes additional data (ID or Pointer).

Then either distinguish in the slot itself by the id you give your objects some virtual function type() so you can distinguish with that or even try casting and catch errors (Tip: don’t try the last method, it may work differently on different compiler).