Giving integer values to QPushButton(s) to apply C++ logic on them in Qt

Question

I have a switch case with condition values from 0-8. Upon each value, I give it an x and y coordinate of a 3x3 array. Then the code operates logic on the 3x3 array to get the results.

I also have 9 buttons in my Qt Designer ui (arranged in a 3x3 matrix). I want each click of the nine buttons to get a corresponding integer value which will then pass through the switch case.

switch (square_number)
{
case 1:         
    x = 0;
    y = 0;
    break;

case 2:
    x = 0;
    y = 1;
    break;

case 3:
    x = 0;
    y = 2;
    break;
.
.
.
//and so on...
default:
    break;
}

I want the square_number to get the integer value corresponding to the push-button clicked.

QSignalMapper seems obsolete or weird at the very least. And I am not that familiar with lambda expressions. Is there a simple way of doing what I want to do?

Answer 1

You can try this approach and use dynamic property:

static constexpr auto IndexPropertyName = "index";

void MainWidnow::SetupPB(QPushButton* b, QPoint index)
{
   connect(b, &QPushButton::clicked, this, &MainWidnow::onSomeButtoPressed);
   p->setProperty(IndexPropertyName, index);
}

void MainWidnow::onSomeButtoPressed(bool checked)
{
   auto index = sender()->property(IndexPropertyName).toPoint();
   doSomethingOn(index);
}

QObject Class | Qt Core 6.4.0

bool QObject::setProperty(const char *name, const QVariant &value)

Sets the value of the object's name property to value.

If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.