Not able to show ClockLabel object

[houmingc]

using ClockLabel class in http://www.java2s.com/Code/Cpp/Qt/Clocklabel.htm
Not able to show ClockLabel although there is no error, below is my implementation.

       QLabel* label_clock;= new QLabel;
       label_clock->setFont(f);
       label_clock->setStyleSheet("QLabel { color : white; }");

        leftLayout = new QVBoxLayout();
        leftLayout->addWidget(label_clock);
        leftLayout->addWidget(labelOneGif);

[SGaist]

Hi,

Do you set that layout anywhere ?

[houmingc]

Yes, i did.
The problem seems class derives from QLabel is not able to be display by layout->addWidget. why is it so?

window->setLayout(mainLayout);
window->showMaximized();

The class is below :
#include <QTimer>
#include <QTime>
#include "clocklabel.h"

ClockLabel::ClockLabel( QWidget *parent ) : QLabel( parent )
{
QTimer *timer = new QTimer( this );
timer->setInterval( 1000 );
connect( timer, SIGNAL(timeout()), this, SLOT(updateTime()) );
timer->start();
updateTime();
}

void ClockLabel::updateTime()
{
setText( QTime::currentTime().toString( "hh:mm" ) );
}

#ifndef CLOCKLABEL_H
#define CLOCKLABEL_H
#include <QLabel>

class ClockLabel : public QLabel
{
Q_OBJECT
public:
ClockLabel( QWidget *parent = 0 );

private slots:
void updateTime();
};

#endif // CLOCKLABEL_H
#include <QApplication>
#include "clocklabel.h"

int main( int argc, char **argv )
{
QApplication app( argc, argv );

ClockLabel clock;
clock.show();

return app.exec();
}

[SGaist]

From your first example, you are not instantiating a ClockLabel but just a QLabel

[houmingc]

Resolved thanks

[SGaist]

What was the problem ?