QT 进度条学习

 记得pro 中添加QT += testlib

#include "progressbar.h"
#include <QTest>

ProgressBar::ProgressBar(QWidget *parent, Qt::WindowFlags f)
    :QDialog(parent, f)
{
    QFont font("ZYSong18030", 12);
    setFont(font);

    setWindowTitle(tr("ProgressBar"));

    QGridLayout *layout = new QGridLayout(this);

    numLabel = new QLabel(tr("File Num:"));
    numLineEdit = new QLineEdit;
    numLineEdit->setText(tr("10"));

    typeLabel = new QLabel(tr("Progress Type:"));
    typeComboBox = new QComboBox;
    typeComboBox->addItem(tr("ProgressBar"));
    typeComboBox->addItem(tr("ProgressDialog"));

    progressBar = new QProgressBar;

    startPushButton = new QPushButton(tr("Start"));

    layout->addWidget(numLabel, 0, 0);
    layout->addWidget(numLineEdit, 0, 1);
    layout->addWidget(typeLabel, 1, 0);
    layout->addWidget(typeComboBox, 1, 1);
    layout->addWidget(progressBar, 2, 0, 1, 2);
    layout->addWidget(startPushButton, 3, 1);
    layout->setMargin(15);
    layout->setSpacing(10);

    connect(startPushButton, SIGNAL(clicked()), this, SLOT(slotStart()));
}

ProgressBar::~ProgressBar()
{

}

void ProgressBar::slotStart()
{
    int num = numLineEdit->text().toInt();

    if (typeComboBox->currentIndex() == 0) // progressbar
    {
        progressBar->setRange(0, num);
        for (int i = 1; i < num + 1; i++)
        {
            progressBar->setValue(i);
            QTest::qWait(1000);
        }
    }
    else if (typeComboBox->currentIndex() == 1) // progressDialog
    {
        QProgressDialog *progressDialog = new QProgressDialog(this);
        QFont font("ZYSong18030", 12);
        progressDialog->setFont(font);
        progressDialog->setWindowModality(Qt::WindowModal);

        progressDialog->setMinimumDuration(5);
        progressDialog->setWindowTitle(tr("Please wait"));
        progressDialog->setLabelText(tr("Copying..."));
        progressDialog->setCancelButtonText(tr("Cancel"));
        progressDialog->setRange(0, num);

        for (int i = 0; i < num+1; i++)
        {
            progressDialog->setValue(i);
            qApp->processEvents();
            QTest::qWait(1000);
            if (progressDialog->wasCanceled())
                return;
        }
    }
}

执行结果：