testccc/login.cpp

#include "login.h"
#include "ui_login.h"

login::login(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::login)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_TranslucentBackground);
    //    setStyleSheet("background-color:{rgba:0,0,0,0}");
    //    setWindowOpacity(0.5);
    setWindowFlag(Qt::FramelessWindowHint);
    t = new QTimer();
    s = 0;
    ui->progressBar->setValue(0);
    ui->progressBar->setAlignment(Qt::AlignVCenter);
    connect(t,SIGNAL(timeout()),this,SLOT(slotTimeout()));
    t->start(1000);

}

login::~login()
{
    delete ui;
    delete w;
}

void login::slotTimeout()
{
    s+=1;
    if(s<6)
        ui->progressBar->setValue(s*20);
    else{
        t->stop();
        delete t;
        close();
        emit(signalReady());
//        w = new MainWindow();
//        w->show();
    }
}