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<h1 class="title">playercontrols.cpp Example File</h1>
<span class="subtitle">multimediawidgets/player/playercontrols.cpp</span>
<!-- $$$multimediawidgets/player/playercontrols.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.
**
** $QT_BEGIN_LICENSE:BSD$
** 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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** and conditions see https://www.qt.io/terms-conditions. For further
** 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
** met:
** * Redistributions of source code must retain the above copyright
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<span class="preprocessor">#include "playercontrols.h"</span>
<span class="preprocessor">#include <QBoxLayout></span>
<span class="preprocessor">#include <QSlider></span>
<span class="preprocessor">#include <QStyle></span>
<span class="preprocessor">#include <QToolButton></span>
<span class="preprocessor">#include <QComboBox></span>
<span class="preprocessor">#include <QAudio></span>
PlayerControls<span class="operator">::</span>PlayerControls(<span class="type">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QWidget</span>(parent)
<span class="operator">,</span> playerState(<span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>StoppedState)
<span class="operator">,</span> playerMuted(<span class="keyword">false</span>)
<span class="operator">,</span> playButton(<span class="number">0</span>)
<span class="operator">,</span> stopButton(<span class="number">0</span>)
<span class="operator">,</span> nextButton(<span class="number">0</span>)
<span class="operator">,</span> previousButton(<span class="number">0</span>)
<span class="operator">,</span> muteButton(<span class="number">0</span>)
<span class="operator">,</span> volumeSlider(<span class="number">0</span>)
<span class="operator">,</span> rateBox(<span class="number">0</span>)
{
playButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QToolButton</span>(<span class="keyword">this</span>);
playButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPlay));
connect(playButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(playClicked()));
stopButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QToolButton</span>(<span class="keyword">this</span>);
stopButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaStop));
stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
connect(stopButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(stop()));
nextButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QToolButton</span>(<span class="keyword">this</span>);
nextButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaSkipForward));
connect(nextButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(next()));
previousButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QToolButton</span>(<span class="keyword">this</span>);
previousButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaSkipBackward));
connect(previousButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(previous()));
muteButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QToolButton</span>(<span class="keyword">this</span>);
muteButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaVolume));
connect(muteButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(muteClicked()));
volumeSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QSlider</span>(<span class="type">Qt</span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="keyword">this</span>);
volumeSlider<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">100</span>);
connect(volumeSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(onVolumeSliderValueChanged()));
rateBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QComboBox</span>(<span class="keyword">this</span>);
rateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="string">"0.5x"</span><span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">0.5</span>));
rateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="string">"1.0x"</span><span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">1.0</span>));
rateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="string">"2.0x"</span><span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">2.0</span>));
rateBox<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">1</span>);
connect(rateBox<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> SLOT(updateRate()));
<span class="type">QBoxLayout</span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QHBoxLayout</span>;
layout<span class="operator">-</span><span class="operator">></span>setMargin(<span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(stopButton);
layout<span class="operator">-</span><span class="operator">></span>addWidget(previousButton);
layout<span class="operator">-</span><span class="operator">></span>addWidget(playButton);
layout<span class="operator">-</span><span class="operator">></span>addWidget(nextButton);
layout<span class="operator">-</span><span class="operator">></span>addWidget(muteButton);
layout<span class="operator">-</span><span class="operator">></span>addWidget(volumeSlider);
layout<span class="operator">-</span><span class="operator">></span>addWidget(rateBox);
setLayout(layout);
}
<span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>State PlayerControls<span class="operator">::</span>state() <span class="keyword">const</span>
{
<span class="keyword">return</span> playerState;
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>setState(<span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>State state)
{
<span class="keyword">if</span> (state <span class="operator">!</span><span class="operator">=</span> playerState) {
playerState <span class="operator">=</span> state;
<span class="keyword">switch</span> (state) {
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>StoppedState:
stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
playButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPlay));
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>PlayingState:
stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
playButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPause));
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>PausedState:
stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
playButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(<span class="type">QStyle</span><span class="operator">::</span>SP_MediaPlay));
<span class="keyword">break</span>;
}
}
}
<span class="type">int</span> PlayerControls<span class="operator">::</span>volume() <span class="keyword">const</span>
{
<span class="type">qreal</span> linearVolume <span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>convertVolume(volumeSlider<span class="operator">-</span><span class="operator">></span>value() <span class="operator">/</span> <span class="type">qreal</span>(<span class="number">100</span>)<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LogarithmicVolumeScale<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LinearVolumeScale);
<span class="keyword">return</span> qRound(linearVolume <span class="operator">*</span> <span class="number">100</span>);
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>setVolume(<span class="type">int</span> volume)
{
<span class="type">qreal</span> logarithmicVolume <span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>convertVolume(volume <span class="operator">/</span> <span class="type">qreal</span>(<span class="number">100</span>)<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LinearVolumeScale<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LogarithmicVolumeScale);
volumeSlider<span class="operator">-</span><span class="operator">></span>setValue(qRound(logarithmicVolume <span class="operator">*</span> <span class="number">100</span>));
}
bool PlayerControls<span class="operator">::</span>isMuted() <span class="keyword">const</span>
{
<span class="keyword">return</span> playerMuted;
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>setMuted(bool muted)
{
<span class="keyword">if</span> (muted <span class="operator">!</span><span class="operator">=</span> playerMuted) {
playerMuted <span class="operator">=</span> muted;
muteButton<span class="operator">-</span><span class="operator">></span>setIcon(style()<span class="operator">-</span><span class="operator">></span>standardIcon(muted
<span class="operator">?</span> <span class="type">QStyle</span><span class="operator">::</span>SP_MediaVolumeMuted
: <span class="type">QStyle</span><span class="operator">::</span>SP_MediaVolume));
}
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>playClicked()
{
<span class="keyword">switch</span> (playerState) {
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>StoppedState:
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>PausedState:
<span class="keyword">emit</span> play();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qmediaplayer.html">QMediaPlayer</a></span><span class="operator">::</span>PlayingState:
<span class="keyword">emit</span> pause();
<span class="keyword">break</span>;
}
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>muteClicked()
{
<span class="keyword">emit</span> changeMuting(<span class="operator">!</span>playerMuted);
}
<span class="type">qreal</span> PlayerControls<span class="operator">::</span>playbackRate() <span class="keyword">const</span>
{
<span class="keyword">return</span> rateBox<span class="operator">-</span><span class="operator">></span>itemData(rateBox<span class="operator">-</span><span class="operator">></span>currentIndex())<span class="operator">.</span>toDouble();
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>setPlaybackRate(<span class="type">float</span> rate)
{
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> rateBox<span class="operator">-</span><span class="operator">></span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (qFuzzyCompare(rate<span class="operator">,</span> <span class="type">float</span>(rateBox<span class="operator">-</span><span class="operator">></span>itemData(i)<span class="operator">.</span>toDouble()))) {
rateBox<span class="operator">-</span><span class="operator">></span>setCurrentIndex(i);
<span class="keyword">return</span>;
}
}
rateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QString</span>(<span class="string">"%1x"</span>)<span class="operator">.</span>arg(rate)<span class="operator">,</span> <span class="type">QVariant</span>(rate));
rateBox<span class="operator">-</span><span class="operator">></span>setCurrentIndex(rateBox<span class="operator">-</span><span class="operator">></span>count() <span class="operator">-</span> <span class="number">1</span>);
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>updateRate()
{
<span class="keyword">emit</span> changeRate(playbackRate());
}
<span class="type">void</span> PlayerControls<span class="operator">::</span>onVolumeSliderValueChanged()
{
<span class="keyword">emit</span> changeVolume(volume());
}
</pre>
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<!-- @@@multimediawidgets/player/playercontrols.cpp -->
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