Qt 4.8: textprogressbar.cpp Example File (network/downloadmanager/textprogressbar.cpp)

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# textprogressbar.cpp Example File

network/downloadmanager/textprogressbar.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include "textprogressbar.h"
     #include <QByteArray>
     #include <stdio.h>

     TextProgressBar::TextProgressBar()
         : value(0), maximum(-1), iteration(0)
     {
     }

     void TextProgressBar::clear()
     {
         printf("\n");
         fflush(stdout);

         iteration = 0;
         value = 0;
         maximum = -1;
     }

     void TextProgressBar::update()
     {
         ++iteration;

         if (maximum > 0) {
             // we know the maximum
             // draw a progress bar
             int percent = value * 100 / maximum;
             int hashes = percent / 2;

             QByteArray progressbar(hashes, '#');
             if (percent % 2)
                 progressbar += '>';

             printf("\r[%-50s] %3d%% %s     ",
                    progressbar.constData(),
                    percent,
                    qPrintable(message));
         } else {
             // we don't know the maximum, so we can't draw a progress bar
             int center = (iteration % 48) + 1; // 50 spaces, minus 2
             QByteArray before(qMax(center - 2, 0), ' ');
             QByteArray after(qMin(center + 2, 50), ' ');

             printf("\r[%s###%s]      %s      ",
                    before.constData(), after.constData(), qPrintable(message));
         }
     }

     void TextProgressBar::setMessage(const QString &m)
     {
         message = m;
     }

     void TextProgressBar::setStatus(qint64 val, qint64 max)
     {
         value = val;
         maximum = max;
     }