Qt-基础-屏保

使用Qt的开发一个的Windows下的屏保部分代码。

Login::Login(QWidget *parent) : QWidget(parent)
{
    layout();
    addImage();
    updateImage();

    QTimer *timer = new QTimer(this);
    timer->start(5000);
    //将定时器超时信号与槽(功能函数)联系起来
    connect(timer, &QTimer::timeout, [&]() {updateImage();});

    this->setAutoFillBackground(true);
    
}
void Login::updateImage()
{
    QPalette palette;
    QPixmap pixmap;
    static bool be = true;
    auto static list = listPixmap.begin();
    if (list == listPixmap.begin())
        be = true;
    else if (list == --listPixmap.end())
        be = false;
    if (be)
        pixmap = *list++;
    else
        pixmap = *list--;
    // 设置背景图片自动缩放充满全屏
    palette.setBrush(this->backgroundRole(),
                      QBrush(pixmap.scaled(this->size(),
                             Qt::IgnoreAspectRatio,
                             Qt::SmoothTransformation)));
    this->setPalette(palette);
}

void Login::addImage()
{
    //QList<QPixmap> listPixmap;
    QPixmap pixmap0(":/new/icon/src/叶子.jpg"), pixmap1(":/new/icon/src/山.jpg"), pixmap2(":/new/icon/src/沙滩.jpg"),pixmap3(":/new/icon/src/login.jpg");
    listPixmap << pixmap0 << pixmap1 << pixmap2 << pixmap3;
}