Qt Button implements button long press event

background

Recently, the project encountered a requirement. Press and hold the mouse button to send data continuously, and release the mouse to leave immediately.
After thinking for a while, there are probably several ideas (just ideas, different can be realized)
1. Rewrite the mouse event and realize it through mouse detection.
2. Timer trigger implementation.
3. Realize through a certain parameter or check command.

research

• QT button class and timer application
• 【QT】Timer
• Qt actual combat case (45) - using QPushButton to realize button long press event

Type 3

The third one meets my needs, try with the third one

widget.cpp source file

    ui->pushButton->setAutoRepeat(true); //启用长按
    ui->pushButton->setAutoRepeatDelay(400);//触发长按的时间
    ui->pushButton->setAutoRepeatInterval(50);//长按时click信号间隔

    connect(ui->pushButton,&QPushButton::clicked,[&]{
    
    
        qDebug()<<i++;
        ui->horizontalSlider->setValue(i);
        if(i>=100)i=100;//将最大值控制在100
    });

The effect does work.

best way

But I took a closer look at the UI interface and found that it doesn’t have to be so troublesome. Check a box to solve the problem.
Qt’s QpushButton realizes the long-press state trigger function

summary

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