Qt学习——进度条QProgressBar/QProgressDialog类

原文地址：http://blog.csdn.net/a649518776/article/details/6648347
两种进度条显示：

QProgressBar和QProgressDialog

下面例子展示两种进度条：

     

代码：

头文件dialog.h中：

    #include <QtGui/QDialog>
    #include <QLabel>
    #include <QLineEdit>
    #include <QProgressBar>
    #include <QComboBox>
    #include <QPushButton>
    #include <QGridLayout>
    class Dialog : public QDialog
    {
        Q_OBJECT

    public:
        Dialog(QWidget *parent = 0);
        ~Dialog();
    private slots:
        void startProgress();
    private:
        QLabel *FileNum;
        QLineEdit *FileNumLineEdit;
        QLabel *ProgressType;
        QComboBox *comboBox;
        QProgressBar *progressBar;
        QPushButton *startBtn;
        QGridLayout *mainLayout;
    }

源文件：

    #include "dialog.h"
    #include <QProgressDialog>
    #include <QFont>

    Dialog::Dialog(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);
        mainLayout->addWidget(FileNumLineEdit,0,1);
        mainLayout->addWidget(ProgressType,1,0);
        mainLayout->addWidget(comboBox,1,1);
        mainLayout->addWidget(progressBar,2,0,1,2);
        mainLayout->addWidget(startBtn,3,1);
        mainLayout->setMargin(15);
        mainLayout->setSpacing(10);

        connect(startBtn,SIGNAL(clicked()),this,SLOT(startProgress()))
    }

    void Dialog::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 if(comboBox->currentIndex()==1)
        {
            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函数添加显示中文的代码：

    #include <QtGui/QApplication>
    #include "dialog.h"
    #include <QTextCodec>
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        QTextCodec::setCodecForTr(QTextCodec::codecForLocale());
        Dialog w;
        w.show();

        return a.exec();
    }