playercontrols.cpp Example File

multimediawidgets/player/playercontrols.cpp
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#include "playercontrols.h" #include <QBoxLayout> #include <QSlider> #include <QStyle> #include <QToolButton> #include <QComboBox> #include <QAudio> PlayerControls::PlayerControls(QWidget *parent) : QWidget(parent) , playerState(QMediaPlayer::StoppedState) , playerMuted(false) , playButton(0) , stopButton(0) , nextButton(0) , previousButton(0) , muteButton(0) , volumeSlider(0) , rateBox(0) { playButton = new QToolButton(this); playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); connect(playButton, SIGNAL(clicked()), this, SLOT(playClicked())); stopButton = new QToolButton(this); stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop)); stopButton->setEnabled(false); connect(stopButton, SIGNAL(clicked()), this, SIGNAL(stop())); nextButton = new QToolButton(this); nextButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipForward)); connect(nextButton, SIGNAL(clicked()), this, SIGNAL(next())); previousButton = new QToolButton(this); previousButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipBackward)); connect(previousButton, SIGNAL(clicked()), this, SIGNAL(previous())); muteButton = new QToolButton(this); muteButton->setIcon(style()->standardIcon(QStyle::SP_MediaVolume)); connect(muteButton, SIGNAL(clicked()), this, SLOT(muteClicked())); volumeSlider = new QSlider(Qt::Horizontal, this); volumeSlider->setRange(0, 100); connect(volumeSlider, SIGNAL(valueChanged(int)), this, SLOT(onVolumeSliderValueChanged())); rateBox = new QComboBox(this); rateBox->addItem("0.5x", QVariant(0.5)); rateBox->addItem("1.0x", QVariant(1.0)); rateBox->addItem("2.0x", QVariant(2.0)); rateBox->setCurrentIndex(1); connect(rateBox, SIGNAL(activated(int)), SLOT(updateRate())); QBoxLayout *layout = new QHBoxLayout; layout->setMargin(0); layout->addWidget(stopButton); layout->addWidget(previousButton); layout->addWidget(playButton); layout->addWidget(nextButton); layout->addWidget(muteButton); layout->addWidget(volumeSlider); layout->addWidget(rateBox); setLayout(layout); } QMediaPlayer::State PlayerControls::state() const { return playerState; } void PlayerControls::setState(QMediaPlayer::State state) { if (state != playerState) { playerState = state; switch (state) { case QMediaPlayer::StoppedState: stopButton->setEnabled(false); playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); break; case QMediaPlayer::PlayingState: stopButton->setEnabled(true); playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause)); break; case QMediaPlayer::PausedState: stopButton->setEnabled(true); playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); break; } } } int PlayerControls::volume() const { qreal linearVolume = QAudio::convertVolume(volumeSlider->value() / qreal(100), QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale); return qRound(linearVolume * 100); } void PlayerControls::setVolume(int volume) { qreal logarithmicVolume = QAudio::convertVolume(volume / qreal(100), QAudio::LinearVolumeScale, QAudio::LogarithmicVolumeScale); volumeSlider->setValue(qRound(logarithmicVolume * 100)); } bool PlayerControls::isMuted() const { return playerMuted; } void PlayerControls::setMuted(bool muted) { if (muted != playerMuted) { playerMuted = muted; muteButton->setIcon(style()->standardIcon(muted ? QStyle::SP_MediaVolumeMuted : QStyle::SP_MediaVolume)); } } void PlayerControls::playClicked() { switch (playerState) { case QMediaPlayer::StoppedState: case QMediaPlayer::PausedState: emit play(); break; case QMediaPlayer::PlayingState: emit pause(); break; } } void PlayerControls::muteClicked() { emit changeMuting(!playerMuted); } qreal PlayerControls::playbackRate() const { return rateBox->itemData(rateBox->currentIndex()).toDouble(); } void PlayerControls::setPlaybackRate(float rate) { for (int i = 0; i < rateBox->count(); ++i) { if (qFuzzyCompare(rate, float(rateBox->itemData(i).toDouble()))) { rateBox->setCurrentIndex(i); return; } } rateBox->addItem(QString("%1x").arg(rate), QVariant(rate)); rateBox->setCurrentIndex(rateBox->count() - 1); } void PlayerControls::updateRate() { emit changeRate(playbackRate()); } void PlayerControls::onVolumeSliderValueChanged() { emit changeVolume(volume()); }