Qt/QT_Assistant/whiteblock/mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include  <QPixmap>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    MainWindow::setWindowTitle(tr("钢琴块儿"));
    connect(ui->widget,&TestWidget::value,this,[=](int value){
        ui->label->setText(QString::number(value));
    });
    timer= new QTimer(this);
    connect(timer, &QTimer::timeout, this, &MainWindow::timeoutSlot);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
     timer->start(500);//ms
    ui->widget->start();
    ui->widget->setFocus();
}

void MainWindow::on_pushButton_2_clicked()
{
      timer->start(500);//ms
    ui->widget->restart();
    ui->widget->setFocus();
}
void MainWindow::timeoutSlot()
{
    static int tmpe=0;

    if(tmpe==0)
    {
     ui->label_4->setPixmap(QPixmap(":/image/image/monster2.png"));
     tmpe=1;
    }
    else
    {
      ui->label_4->setPixmap(QPixmap(":/image/image/monster1.png"));
       tmpe=0;
    }
}