qaudiolevel.cpp Example File | Qt Multimedia 5.4

- Qt 5.4
- Qt Multimedia
- Audio Recorder Example
- qaudiolevel.cpp Example File
- Qt 5.4.2 Reference Documentation

# qaudiolevel.cpp Example File

audiorecorder/qaudiolevel.cpp

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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    #include "qaudiolevel.h"
    #include <QPainter>

    QAudioLevel::QAudioLevel(QWidget *parent)
      : QWidget(parent)
      , m_level(0.0)
    {
        setMinimumHeight(15);
        setMaximumHeight(50);
    }

    void QAudioLevel::setLevel(qreal level)
    {
        if (m_level != level) {
            m_level = level;
            update();
        }
    }

    void QAudioLevel::paintEvent(QPaintEvent *event)
    {
        Q_UNUSED(event);

        QPainter painter(this);
        // draw level
        qreal widthLevel = m_level * width();
        painter.fillRect(0, 0, widthLevel, height(), Qt::red);
        // clear the rest of the control
        painter.fillRect(widthLevel, 0, width(), height(), Qt::black);
    }