Qt-----进度条QProgressBar

//MyDlg.h
#ifndef MYDLG_H
#define MYDLG_H
#include <QDialog>
class QLabel;
class QLineEdit;
class QComboBox;
class QProgressBar;
class QPushButton;
class QGridLayout;
class MyDlg : public QDialog
{
Q_OBJECT
public:
MyDlg(QWidget *parent = 0);
private slots:
void startProgress();
private:
QLabel *fileNum;
QLineEdit *fileNumLineEdit;
QLabel *progressType;
QComboBox *comboBox;
QProgressBar *progressBar;
QPushButton *startBtn;
QGridLayout *mainLayout;
};
#endif // MYDLG_H

//MyDlg.cpp
#include <QDialog>
#include <QLabel>
#include <QLineEdit>
#include <QComboBox>
#include <QPushButton>
#include <QProgressBar>
#include <QProgressDialog>
#include <QWidget>
#include <QGridLayout>
#include "MyDlg.h"
MyDlg::MyDlg(QWidget *parent) : QDialog(parent)
{
setWindowTitle(tr("Progress"));
fileNum = new QLabel;
fileNum->setText(tr("文件数目："));
fileNumLineEdit = new QLineEdit;
fileNumLineEdit->setText(tr("10000"));
progressType = new QLabel;
progressType->setText(tr("显示类型"));
comboBox = new QComboBox;
comboBox->addItem(tr("progressBar"));
comboBox->addItem(tr("progressDialog"));
progressBar = new QProgressBar;
startBtn = new QPushButton;
startBtn->setText(tr("开始"));
mainLayout = new QGridLayout(this);
mainLayout->addWidget(fileNum, 0, 0, 1, 1);
mainLayout->addWidget(fileNumLineEdit, 0, 1, 1, 1);
mainLayout->addWidget(progressType, 1, 0, 1, 1);
mainLayout->addWidget(comboBox, 1, 1, 1 ,1);
mainLayout->addWidget(progressBar, 2, 1, 1, 2);
mainLayout->addWidget(startBtn, 3, 1, 1, 1);
mainLayout->setMargin(15);
mainLayout->setSpacing(10);
connect(startBtn, SIGNAL(clicked()), this, SLOT(startProgress()));
}
void MyDlg::startProgress()
{
bool ok;
int num = fileNumLineEdit->text().toInt(&ok);
if(!ok)
{
return ;
}
if(comboBox->currentIndex() == 0)
{
progressBar->setRange(0, num);
for(int i = 1; i <= num; i++)
{
progressBar->setValue(i);
}
}
else
{
QProgressDialog *progressDlg=new QProgressDialog(this);
QFont font("ZYSong18030",12);
progressDlg->setFont(font);
progressDlg->setWindowModality(Qt::WindowModal);
progressDlg->setMinimumDuration(5);
progressDlg->setWindowTitle(tr("please wait"));
progressDlg->setLabelText(tr("正在复制......     "));
progressDlg->setCancelButtonText(tr("取消"));
progressDlg->setRange(0,num);
for(int i = 1; i <= num; i++)
{
progressDlg->setValue(i);
if(progressDlg->wasCanceled())
{
return ;
}
}
}
}

//main.cpp
#include <QApplication>
#include <QTextCodec>
#include "MyDlg.h"
int main(int argc, char *argv[])
{
QTextCodec::setCodecForTr(QTextCodec::codecForLocale());
QApplication app(argc, argv);
MyDlg md;
md.show();
return app.exec();
}