[help] How to start/stop updating widget members using QButton?

[rayglide]

Hi to forum member,

I'm really new to Qt C++ programming and need help on constructing a very basic concepts.

So here is my objectives:
I create a Qt GUI application consists of several widgets among them are simple QPushButton and QTextEdit widget. So the idea is, when I press the button I'll start updating the QTextEdit text using setText(). However, I need to delegate this process to separated threads/process/events (what is the best approach?) that will respond (start/stop) on the push button click signal.

Below is my code that I needed help to complete it:

void MyUI::ViewData(){  //this is a slot that is called upon clicked() signal on the pushButton
    QString rawdata = "";
 
    if(ui->pushButtonView->text() == "Start") {
        ui->pushButtonView->setText("Stop");
 
//how to delegate starting update in this part ... ?
 
    } else if (ui->pushButtonView->text() == "Stop") {
        ui->pushButtonView->setText("Start");
 
//how to delegate stoping update in this part ... ?
 
        ui->dataDisplay->setText("");
    }
}

void MyUI::ViewData(){  //this is a slot that is called upon clicked() signal on the pushButton
    QString rawdata = "";

    if(ui->pushButtonView->text() == "Start") {
        ui->pushButtonView->setText("Stop");

//how to delegate starting update in this part ... ?

    } else if (ui->pushButtonView->text() == "Stop") {
        ui->pushButtonView->setText("Start");

//how to delegate stoping update in this part ... ?

        ui->dataDisplay->setText("");
    }
}

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Thanks

[high_flyer]

However, I need to delegate this process to separated threads/process/events

Why is that?

I am not quite sure I follow on what you are trying to do:
you have a buttong with which you want to start a new thread?
And you want to update your QTextEdit from that thread?

If this is the case, you can just start/stop the thread in the slot connected to the button.
And you can connect a signal from the thread to the QTextEdit::setText() slot.

[rayglide]

Thanks for the reply and sorry I've just read it now.

Yes, thanks now I know that actually slot is running on separate thread from main gui thread. Previously I think that if I go indefinite loop in the slot connected to button signal then the gui will stuck. Anyway I used QTimer for my purpose, so I can change the interval of the update whenever I want.

Thanks.