CODEWITHSUNDEEP
qt
Cengaver
Cengaver

Reputation: 371

How to make a QPushButton disabled

I created lots of QPushButtons, added clicked signal and a slot name deneme() to all of the buttons with QT DESIGNER and the thing I want to do is; when I clicked any button, some operation should be done and lastly the button should be disabled but we do not know which button is clicked. I know I can disable the buttons with setEnabled() and isEnabled() but I do not know how to disable them.

Upvotes: 36

Views: 128214

Answers (4)

bruno
bruno

Reputation: 2882

If I understood correctly you connected various QPushButtons to the same slot. Inside of the slot deneme() you want to know which of the buttons was clicked. You can do something like:

  void deneme() {
    QPushButton * b = qobject_cast<QPushButton *>(sender());
    if (b) {
       if (b == button1) { //button1 clicked
           //doSomething();
       } 
       else {
          if (b == button2) {
             //doSomething();
          }
       }
       b->setEnabled(false);
    }
  }

Upvotes: 46

O.C.
O.C.

Reputation: 6819

Bruno's answer is correct.

sender();

returns a QObject* You can cast it to a QPushButton* using either C Style cast i.e QPushButton* clickedButton = (QPushButton*)(sender()) or QPushButton* clickedButton = static_cast<QPushButton*>(sender()) or QPushButton * clickedButton = qobject_cast(sender()); as far as i know qobject_cast works similar to dynamic_cast<> in C++. But if you are having compilation problems any solution given above should work fine.

Upvotes: 1

RvdK
RvdK

Reputation: 19790

Why is setEnabled not working then? The reference.

So a simple setEnabled(false); is enough.

QPushButton* button = new QPushButton(someParent);
button->setEnabled(false);

If the connecting a event handler on the click event of the button maybe you should look at the QT documentation: Signal and slots

Upvotes: 13

beduin
beduin

Reputation: 8253

You mean Button has to be disabled right after clicking on it? I guess in that case you probably want to do something like this:

class MyWidget : public QWidget 
{
Q_OBJECT

// ...

private slots:
  void disableButton();

private:
  QPushButton *myButton;

// ...
};

MyWidget::MyWidget(QWidget *parent = NULL) : QWidget(parent) 
{

///...
myButton = new QPushButton("click me", this);
connect(myButton, SIGNAL(clicked), this, SLOT(disableButton));
// ...
}

void MyWidget::disableButton() 
{
myButton->setEnabled(false);
}

Upvotes: 2

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