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<h1 class="title">progressbar.cpp Example File</h1>
<span class="subtitle">multimedia/spectrum/app/progressbar.cpp</span>
<!-- $$$multimedia/spectrum/app/progressbar.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** information use the contact form at https://www.qt.io/contact-us.
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** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
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<span class="preprocessor">#include "progressbar.h"</span>
<span class="preprocessor">#include "spectrum.h"</span>
<span class="preprocessor">#include <QPainter></span>
ProgressBar<span class="operator">::</span>ProgressBar(<span class="type">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QWidget</span>(parent)
<span class="operator">,</span> m_bufferLength(<span class="number">0</span>)
<span class="operator">,</span> m_recordPosition(<span class="number">0</span>)
<span class="operator">,</span> m_playPosition(<span class="number">0</span>)
<span class="operator">,</span> m_windowPosition(<span class="number">0</span>)
<span class="operator">,</span> m_windowLength(<span class="number">0</span>)
{
setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Preferred<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed);
setMinimumHeight(<span class="number">30</span>);
<span class="preprocessor">#ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM</span>
setAutoFillBackground(<span class="keyword">false</span>);
<span class="preprocessor">#endif</span>
}
ProgressBar<span class="operator">::</span><span class="operator">~</span>ProgressBar()
{
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>reset()
{
m_bufferLength <span class="operator">=</span> <span class="number">0</span>;
m_recordPosition <span class="operator">=</span> <span class="number">0</span>;
m_playPosition <span class="operator">=</span> <span class="number">0</span>;
m_windowPosition <span class="operator">=</span> <span class="number">0</span>;
m_windowLength <span class="operator">=</span> <span class="number">0</span>;
update();
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>paintEvent(<span class="type">QPaintEvent</span> <span class="operator">*</span> <span class="comment">/*event*/</span>)
{
<span class="type">QPainter</span> painter(<span class="keyword">this</span>);
<span class="type">QColor</span> bufferColor(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">255</span>);
<span class="type">QColor</span> windowColor(<span class="number">0</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">0</span>);
<span class="preprocessor">#ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM</span>
bufferColor<span class="operator">.</span>setAlphaF(<span class="number">0.5</span>);
windowColor<span class="operator">.</span>setAlphaF(<span class="number">0.5</span>);
<span class="preprocessor">#else</span>
painter<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>black);
<span class="preprocessor">#endif</span>
<span class="keyword">if</span> (m_bufferLength) {
<span class="type">QRect</span> bar <span class="operator">=</span> rect();
<span class="keyword">const</span> <span class="type">qreal</span> play <span class="operator">=</span> <span class="type">qreal</span>(m_playPosition) <span class="operator">/</span> m_bufferLength;
bar<span class="operator">.</span>setLeft(rect()<span class="operator">.</span>left() <span class="operator">+</span> play <span class="operator">*</span> rect()<span class="operator">.</span>width());
<span class="keyword">const</span> <span class="type">qreal</span> record <span class="operator">=</span> <span class="type">qreal</span>(m_recordPosition) <span class="operator">/</span> m_bufferLength;
bar<span class="operator">.</span>setRight(rect()<span class="operator">.</span>left() <span class="operator">+</span> record <span class="operator">*</span> rect()<span class="operator">.</span>width());
painter<span class="operator">.</span>fillRect(bar<span class="operator">,</span> bufferColor);
<span class="type">QRect</span> window <span class="operator">=</span> rect();
<span class="keyword">const</span> <span class="type">qreal</span> windowLeft <span class="operator">=</span> <span class="type">qreal</span>(m_windowPosition) <span class="operator">/</span> m_bufferLength;
window<span class="operator">.</span>setLeft(rect()<span class="operator">.</span>left() <span class="operator">+</span> windowLeft <span class="operator">*</span> rect()<span class="operator">.</span>width());
<span class="keyword">const</span> <span class="type">qreal</span> windowWidth <span class="operator">=</span> <span class="type">qreal</span>(m_windowLength) <span class="operator">/</span> m_bufferLength;
window<span class="operator">.</span>setWidth(windowWidth <span class="operator">*</span> rect()<span class="operator">.</span>width());
painter<span class="operator">.</span>fillRect(window<span class="operator">,</span> windowColor);
}
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>bufferLengthChanged(<span class="type">qint64</span> bufferSize)
{
m_bufferLength <span class="operator">=</span> bufferSize;
m_recordPosition <span class="operator">=</span> <span class="number">0</span>;
m_playPosition <span class="operator">=</span> <span class="number">0</span>;
m_windowPosition <span class="operator">=</span> <span class="number">0</span>;
m_windowLength <span class="operator">=</span> <span class="number">0</span>;
repaint();
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>recordPositionChanged(<span class="type">qint64</span> recordPosition)
{
Q_ASSERT(recordPosition <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
Q_ASSERT(recordPosition <span class="operator"><</span><span class="operator">=</span> m_bufferLength);
m_recordPosition <span class="operator">=</span> recordPosition;
repaint();
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>playPositionChanged(<span class="type">qint64</span> playPosition)
{
Q_ASSERT(playPosition <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
Q_ASSERT(playPosition <span class="operator"><</span><span class="operator">=</span> m_bufferLength);
m_playPosition <span class="operator">=</span> playPosition;
repaint();
}
<span class="type">void</span> ProgressBar<span class="operator">::</span>windowChanged(<span class="type">qint64</span> position<span class="operator">,</span> <span class="type">qint64</span> length)
{
Q_ASSERT(position <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
Q_ASSERT(position <span class="operator"><</span><span class="operator">=</span> m_bufferLength);
Q_ASSERT(position <span class="operator">+</span> length <span class="operator"><</span><span class="operator">=</span> m_bufferLength);
m_windowPosition <span class="operator">=</span> position;
m_windowLength <span class="operator">=</span> length;
repaint();
}
</pre>
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<!-- @@@multimedia/spectrum/app/progressbar.cpp -->
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