How to prevent the mouse click event from happening when the button is Disabled

[ManiRon]

@jsulm

 ui->label->clear();
ui->label->repaint();
  ui->pushbutton->setDisabled(true);
   TargetConnect();

This is my exact code when i click the button

[jsulm]

@ManiRon You mean this is the code in the slot connected to clicked() signal?
What about my other questions? Can you answer them?

[ManiRon]

@jsulm I am using a style sheet , so i am not able to see whether the button is greyed out , i create a change in color when it is pressed , the color remains the same till the button is enabled

[jsulm]

@ManiRon Are you sure you're disabling the correct button?
As I said: I can't reproduce such behaviour, there must be something in your code.
Also you can disable your style sheet and test again.
And to be sure: in the title you're talking about event, but you mean clicked() signal, correct?

[ManiRon]

@jsulm Yes clicked signal

[J.Hilk]

@ManiRon
can you create a minimal example?

In fact you should!
Or maybe @jsulm can share his for you ;)

[jsulm]

@J.Hilk @ManiRon It's as simple as

connect(ui->pushButton, &QPushButton::clicked, [this](bool){ qDebug() << "Clicked"; ui->pushButton->setDisabled(true);});

And I'm still interested in an answer to this question: Are you sure you're disabling the correct button?

[Pradeep P N]

@jsulm @J-Hilk

I think the problem here for @ManiRon is the style sheet for the QPushButton

The Button is actually disabled on Click, but due to the StyleSheet the color difference is not found.

void MainWindow::on_pushButton_clicked()
{
    qDebug() << Q_FUNC_INFO;
    ui->label->setText("Button is Disabled");
    ui->pushButton->setEnabled(false);
}

[ManiRon]

@jsulm Yes Actually i am disabling the button for 3sec only so it accepts the signal again after 3sec , which i came to know when i printed the time with seconds

[ManiRon]

@jsulm I think the problem here is the timeout that i have given , i think its less

[Pradeep P N]

@ManiRon
I just tried with Timer it works fine.
The Button is disabled for 3s.

• Check with your stylesheet.

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->label->setVisible(false);

    tmr = new QTimer(this);
    connect(tmr, &QTimer::timeout, [this]{
        ui->pushButton->setEnabled(true);
    });
}

void MainWindow::on_pushButton_clicked()
{
    qDebug() << Q_FUNC_INFO << QTime::currentTime().toString();

    tmr->start();
    tmr->setInterval(3000);

    ui->pushButton->setEnabled(false);
}

[Pradeep P N]

Hi @ManiRon

Try this with your setStyleSheet()

ui->pushButton->setStyleSheet("QPushButton {"
                              "background-color:#44c767;"
                              "}"
                              "QPushButton:disabled {"
                              "background-color:gray;"
                              "}");

All the best.

[ManiRon]

@Pradeep-P-N @jsulm @J-Hilk
when i created a sample i was absorbing one thing , that when i click the button i disabled it , but while i click the button when it is disabled after enabling the button the click signal gets emitted and the click function is executed by the click signal which was occuring when i clicked the button when it was disabled

[J.Hilk]

@ManiRon said in How to prevent the mouse click event from happening when the button is Disabled:

but while i click the button when it is disabled after enabling the button the click signal gets emitted and the click function is executed

If true, then that's a bug in the library!

[ManiRon]

@J.Hilk how it can be solved ?

[Pradeep P N]

@J.Hilk
i am bit confused with the statement in fact.

"but while i click the button when it is disabled after enabling the button the click signal gets emitted and the click function is executed"

• i click the button when it is disabled -> Nothing will work as Button is Disabled.
• after enabling the button the click signal gets emitted -> Yes as after 3s timer the button is enabled and can be clicked.

[J.Hilk]

@Pradeep-P-N

What I get out of @ManiRon statement is:

• Button is disabled
• Button gets pressed/clicked
• • nothing happens, as expected
• Button gets set to enabled
• • clicked signal is emitted without button interaction

Thats not normal behavior in my opinion

I'll make a quick test case

@ManiRon what Qt Version what OS btw?

[Pradeep P N]

Hmmm, Got it @J-Hilk
Thanks.

@ManiRon Can you share a sample code ?
You said you are using the QTimer.
Just wanted to check if there is anything mismatch with the code.

[J.Hilk]

@J.Hilk said in How to prevent the mouse click event from happening when the button is Disabled:

If true, then that's a bug in the library!

Nope, not true 5.12.4 MacOS, no unexpected clicked emits

int main(int argc, char *argv[])
{

    QApplication a(argc, argv);

    auto *btn = new QPushButton("Enabled");
    btn->resize(200, 50);
    btn->show();

    QObject::connect(btn, &QPushButton::clicked, [btn]()->void{
                         btn->setEnabled(false);
                         btn->setText("Disabled");
                         qDebug("Btn clicked");
                     });
    QObject::connect(btn, &QPushButton::pressed, []()->void{qDebug("Btn Pressed"); });
    QObject::connect(btn, &QPushButton::released, []()->void{qDebug("Btn Released"); });

    QTimer t_reset;
    t_reset.setInterval(3000);
    QObject::connect(&t_reset, &QTimer::timeout, btn, [btn]()->void{btn->setEnabled(true); btn->setText("Enabled");});

    QObject::connect(btn, &QPushButton::clicked, &t_reset, QOverload<>::of(&QTimer::start));

    return  a.exec();
}

[Pradeep P N]

@J-Hilk
Even i tried on 5.12.3 - Ubuntu 16.04 & the above code ( From my post ).
Also the one shared by you.
It works fine.

• No Click called related to button enable/disable status.