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();
}

 

程序运行截图：