qt事件过滤器实现屏幕无操作超时通知

#include "ceventfilter.h" #include <QDebug> #include <QEvent> CEventFilter::CEventFilter(QObject *parent) : QObject(parent) { m_timeOutMSec = 30000; m_eventTimer = new QTimer; m_eventTimer->setInterval(m_timeOutMSec); connect(m_eventTimer, SIGNAL(timeout()), this, SLOT(onTimerTimeOut())); m_eventTimer->start(m_timeOutMSec); } CEventFilter::~CEventFilter() { delete m_eventTimer; } bool CEventFilter::eventFilter(QObject *ob, QEvent *e) { if( e->type()==QEvent::MouseMove||e->type()==QEvent::MouseButtonPress ||e->type()==QEvent::MouseButtonRelease)// 判断如果是鼠标移动事件 { if(m_eventTimer->isActive())//have_dosthtimer很显然是个定时器，在这判断是否已经开启. { m_eventTimer->stop(); m_eventTimer->start();//如果已经开启，并且有鼠标移动事件就需要计时器重新计算(这里是30s) //qDebug()<<"detect touch event, restart timer, Event type: "<<e->type(); } } return QObject::eventFilter(ob,e);//其他事件仍然交给系统处理。这句一定不能少。 } void CEventFilter::onTimerTimeOut() { qDebug()<<m_timeOutMSec<<" ms not operation ..."; emit noOperationDetect(); } void CEventFilter::setTimeOutSecond(int sec) { m_timeOutMSec = sec*1000; m_eventTimer->stop(); m_eventTimer->setInterval(m_timeOutMSec); m_eventTimer->start(); } CEventFilter *CEventFilter::m_instance = NULL; CEventFilter *CEventFilter::getInstance() { if ( m_instance == NULL ) { m_instance = new CEventFilter; } return m_instance; }