progressbar.cpp Example File

multimedia/spectrum/app/progressbar.cpp
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#include "progressbar.h" #include "spectrum.h" #include <QPainter> ProgressBar::ProgressBar(QWidget *parent) : QWidget(parent) , m_bufferLength(0) , m_recordPosition(0) , m_playPosition(0) , m_windowPosition(0) , m_windowLength(0) { setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed); setMinimumHeight(30); #ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM setAutoFillBackground(false); #endif } ProgressBar::~ProgressBar() { } void ProgressBar::reset() { m_bufferLength = 0; m_recordPosition = 0; m_playPosition = 0; m_windowPosition = 0; m_windowLength = 0; update(); } void ProgressBar::paintEvent(QPaintEvent * /*event*/) { QPainter painter(this); QColor bufferColor(0, 0, 255); QColor windowColor(0, 255, 0); #ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM bufferColor.setAlphaF(0.5); windowColor.setAlphaF(0.5); #else painter.fillRect(rect(), Qt::black); #endif if (m_bufferLength) { QRect bar = rect(); const qreal play = qreal(m_playPosition) / m_bufferLength; bar.setLeft(rect().left() + play * rect().width()); const qreal record = qreal(m_recordPosition) / m_bufferLength; bar.setRight(rect().left() + record * rect().width()); painter.fillRect(bar, bufferColor); QRect window = rect(); const qreal windowLeft = qreal(m_windowPosition) / m_bufferLength; window.setLeft(rect().left() + windowLeft * rect().width()); const qreal windowWidth = qreal(m_windowLength) / m_bufferLength; window.setWidth(windowWidth * rect().width()); painter.fillRect(window, windowColor); } } void ProgressBar::bufferLengthChanged(qint64 bufferSize) { m_bufferLength = bufferSize; m_recordPosition = 0; m_playPosition = 0; m_windowPosition = 0; m_windowLength = 0; repaint(); } void ProgressBar::recordPositionChanged(qint64 recordPosition) { Q_ASSERT(recordPosition >= 0); Q_ASSERT(recordPosition <= m_bufferLength); m_recordPosition = recordPosition; repaint(); } void ProgressBar::playPositionChanged(qint64 playPosition) { Q_ASSERT(playPosition >= 0); Q_ASSERT(playPosition <= m_bufferLength); m_playPosition = playPosition; repaint(); } void ProgressBar::windowChanged(qint64 position, qint64 length) { Q_ASSERT(position >= 0); Q_ASSERT(position <= m_bufferLength); Q_ASSERT(position + length <= m_bufferLength); m_windowPosition = position; m_windowLength = length; repaint(); }