无法显示自制的电子钟，这是为什么？ [复制链接]

我做了一个电子钟，但是无法显示，请各路高手都来指点指点

"DIYClock.h"

DIYClock::DIYClock(QWidget *parent)
:QLCDNumber(parent)
{
    QPalette p=palette();
    p.setColor(QPalette::Window,Qt::green);
    setPalette(p);

    setWindowFlags(Qt::FramelessWindowHint);

    setWindowOpacity(0.5);

    QTimer *timer=new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));
    timer->start(1000);

    showTime();

    resize(150,60);
    showColon=true;
}

void DIYClock::showTime()
{
    QTime time=QTime::currentTime();
    QString text=time.toString("HH:mm");
    if(showColon)
    {
        text[2]=':';
        showColon=false;
    }
    else
    {
        text[2]=' ';
        showColon=true;
    }
    display(text);
}

void DIYClock::mousePressEvent(QMouseEvent *e)
{
    if(e->button()==Qt::LeftButton)
    {
        dragPosition=e->globalPos()-frameGeometry().topLeft();
        e->accept();
    }
    if(e->button()==Qt::RightButton)
    {
        close();
    }
}

void DIYClock::mouseMoveEvent(QMouseEvent *e)
{
    if(e->buttons()&Qt::LeftButton)
    {
        move(e->globalPos()-dragPosition);
        e->accept();
    }
}



mainWindow.cpp

mainWindow::mainWindow(QWidget *parent,Qt::WindowFlags f)
:QWidget(parent,f)
{
        clockButton=new customizeButton(tr("电子钟"),this);
        clockButton->setFlat(FALSE);
        QColor clockButtonColor1(Qt::darkRed);
        QColor clockButtonColor2(Qt::black);
        QColor clockButtonColor3(Qt::red);
        clockButton->setColor(clockButtonColor1);
        clockButton->setShadow(clockButtonColor2);
        clockButton->setHighlight(clockButtonColor3);
        clockButton->setRoundness(20);
        clockButton->setOpacity(0.65);
        clockButton->setToolTip(tr("电子钟显示/隐藏"));
        QObject::connect(clockButton,SIGNAL(clicked()),this,SLOT(chooseClock()));
}
void mainWindow::chooseClock()
{
    DIYClock *clock=new DIYClock(this);
    clock->showTime();
}

这样看代码，确实费力气。

你调试一下，看看问题出在哪里。