[Qt 练习]QProgressBar

转载：http://blog.chinaunix.net/uid-27225886-id-3352398.html

progressbar.h

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#ifndef PROGRESSBAR_H

#define PROGRESSBAR_H

#include <QProgressBar>

class QString;

class ProgressBar: public QProgressBar

{

Q_OBJECT

public:

ProgressBar(QWidget *parent = 0):QProgressBar(parent){}

QString strText;

public slots:

void stepOne();

};

#endif // PROGRESSBAR_H

progressbar.cpp

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#include "progressbar.h"

#include <QString>

void ProgressBar::stepOne()

{

if(this->value()+1 <= this->maximum())

{

this->setValue(this->value()+1);

strText = "QProgressBar Test : "+this->text();

this->setWindowTitle(strText);

}

else

{

this->setValue(this->minimum());

}

}

main.cpp

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#include <QApplication>

#include <QTimer>

#include "progressbar.h"

int main(int argc, char**argv)

{

QApplication app(argc, argv);

//progressBar

ProgressBar *progressBar = new ProgressBar;

progressBar->setWindowTitle("QProgressBar Test");

progressBar->resize(400,40);

progressBar->setMaximum(100);

progressBar->setMinimum(0);

progressBar->setValue(0);

//define a timer

QTimer *timer = new QTimer;

timer->start(500);

QObject::connect(timer, SIGNAL(timeout()), progressBar, SLOT(stepOne()));

progressBar->show();

return app.exec();

}

运行效果图