playercontrols.cpp Example File

/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: ** ** 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 ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see For further ** information use the contact form at ** ** BSD License Usage ** Alternatively, 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 "playercontrols.h" #include <QBoxLayout> #include <QSlider> #include <QStyle> #include <QToolButton> #include <QComboBox> #include <QAudio> PlayerControls::PlayerControls(QWidget *parent) : QWidget(parent) { m_playButton = new QToolButton(this); m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); connect(m_playButton, &QAbstractButton::clicked, this, &PlayerControls::playClicked); m_stopButton = new QToolButton(this); m_stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop)); m_stopButton->setEnabled(false); connect(m_stopButton, &QAbstractButton::clicked, this, &PlayerControls::stop); m_nextButton = new QToolButton(this); m_nextButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipForward)); connect(m_nextButton, &QAbstractButton::clicked, this, &PlayerControls::next); m_previousButton = new QToolButton(this); m_previousButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipBackward)); connect(m_previousButton, &QAbstractButton::clicked, this, &PlayerControls::previous); m_muteButton = new QToolButton(this); m_muteButton->setIcon(style()->standardIcon(QStyle::SP_MediaVolume)); connect(m_muteButton, &QAbstractButton::clicked, this, &PlayerControls::muteClicked); m_volumeSlider = new QSlider(Qt::Horizontal, this); m_volumeSlider->setRange(0, 100); connect(m_volumeSlider, &QSlider::valueChanged, this, &PlayerControls::onVolumeSliderValueChanged); m_rateBox = new QComboBox(this); m_rateBox->addItem("0.5x", QVariant(0.5)); m_rateBox->addItem("1.0x", QVariant(1.0)); m_rateBox->addItem("2.0x", QVariant(2.0)); m_rateBox->setCurrentIndex(1); connect(m_rateBox, QOverload<int>::of(&QComboBox::activated), this, &PlayerControls::updateRate); QBoxLayout *layout = new QHBoxLayout; layout->setMargin(0); layout->addWidget(m_stopButton); layout->addWidget(m_previousButton); layout->addWidget(m_playButton); layout->addWidget(m_nextButton); layout->addWidget(m_muteButton); layout->addWidget(m_volumeSlider); layout->addWidget(m_rateBox); setLayout(layout); } QMediaPlayer::State PlayerControls::state() const { return m_playerState; } void PlayerControls::setState(QMediaPlayer::State state) { if (state != m_playerState) { m_playerState = state; switch (state) { case QMediaPlayer::StoppedState: m_stopButton->setEnabled(false); m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); break; case QMediaPlayer::PlayingState: m_stopButton->setEnabled(true); m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause)); break; case QMediaPlayer::PausedState: m_stopButton->setEnabled(true); m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); break; } } } int PlayerControls::volume() const { qreal linearVolume = QAudio::convertVolume(m_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); m_volumeSlider->setValue(qRound(logarithmicVolume * 100)); } bool PlayerControls::isMuted() const { return m_playerMuted; } void PlayerControls::setMuted(bool muted) { if (muted != m_playerMuted) { m_playerMuted = muted; m_muteButton->setIcon(style()->standardIcon(muted ? QStyle::SP_MediaVolumeMuted : QStyle::SP_MediaVolume)); } } void PlayerControls::playClicked() { switch (m_playerState) { case QMediaPlayer::StoppedState: case QMediaPlayer::PausedState: emit play(); break; case QMediaPlayer::PlayingState: emit pause(); break; } } void PlayerControls::muteClicked() { emit changeMuting(!m_playerMuted); } qreal PlayerControls::playbackRate() const { return m_rateBox->itemData(m_rateBox->currentIndex()).toDouble(); } void PlayerControls::setPlaybackRate(float rate) { for (int i = 0; i < m_rateBox->count(); ++i) { if (qFuzzyCompare(rate, float(m_rateBox->itemData(i).toDouble()))) { m_rateBox->setCurrentIndex(i); return; } } m_rateBox->addItem(QString("%1x").arg(rate), QVariant(rate)); m_rateBox->setCurrentIndex(m_rateBox->count() - 1); } void PlayerControls::updateRate() { emit changeRate(playbackRate()); } void PlayerControls::onVolumeSliderValueChanged() { emit changeVolume(volume()); }