[C++知识库] Qt自定义控件01 简易计时器

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[C++知识库]Qt自定义控件01 简易计时器

控件用于计时，如录音时，录视频时，或者群聊计时等等

class TimeRunningWidget : public QWidget
{
    Q_OBJECT
public:
    explicit TimeRunningWidget(QWidget* parent = nullptr);
    ~TimeRunningWidget();

    void StartRun();
    void StopRun();
    void ClearTime();

private:
    void InitWidget();

protected:
    void paintEvent(QPaintEvent* e);
private:
   QTimer *m_timer;
   QTime m_time;
   QString m_timeStr;
};


TimeRunningWidget::TimeRunningWidget(QWidget *parent):QWidget(parent)
{
    InitWidget();
    //Qt::WindowFlags flags = windowFlags();
    //setWindowFlags( flags | Qt::FramelessWindowHint);
}

TimeRunningWidget::~TimeRunningWidget()
{

}

void TimeRunningWidget::StartRun()
{
    m_timer->start();
}

void TimeRunningWidget::StopRun()
{
    if(m_timer->isActive())
        m_timer->stop();
}

void TimeRunningWidget::ClearTime()
{
    if(m_timer->isActive())
        m_timer->stop();
    m_time.setHMS(0,0,0);
    m_timeStr = m_time.toString("hh:mm:ss");
    update();
}

void TimeRunningWidget::InitWidget()
{
    m_timer = new QTimer(this);
    m_timer->setInterval(1000);
    m_time.setHMS(0,0,0);
    m_timeStr = "00:00:00";
    connect(m_timer,&QTimer::timeout,this,[this](){
        m_time = m_time.addSecs(1);
        m_timeStr = m_time.toString("hh:mm:ss");
        update();
    });
    m_timer->start();
    update();
}

void TimeRunningWidget::paintEvent(QPaintEvent *e)
{
    Q_UNUSED(e);
       QPainter painter;
       painter.begin(this);
       painter.setRenderHints(QPainter::Antialiasing, true);

       QPen pen;
       pen.setColor(Qt::red);
       painter.setPen(pen);
       painter.drawRoundedRect(1, 1, width()-2, height()-2, 16, 16);
       painter.save();
       QBrush br;
       br.setStyle(Qt::SolidPattern);
       br.setColor(Qt::red);
       painter.setBrush(br);
       painter.drawEllipse(QRect(10, height()/2 - 5 , 10, 10));
       painter.restore();

       painter.save();
       pen.setColor(Qt::red);
       painter.setPen(pen);
       QFont font;
       font.setBold(true);
       font.setPixelSize(16);
       painter.setFont(font);
       painter.drawText(QRect(20,0,width()-20,height()), Qt::AlignCenter, m_timeStr);

       painter.restore();
       painter.end();
}