Qt学习: QTimerEvent定时器事件的处理程序代码示例

重要函数:
1.int startTimer(int); //设置定时器，返回一个ld.
2.int event->timerld(); //返回当前的ld.
3.void killTimer(int); //停止定时器.

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首先从Qt设计师中拖拽出三个按钮，由于只是演示定时器事件的使用，所以就没有布局的需要了.

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以下是”c.cpp”的代码:

#include "c.h"c::c(QWidget *parent)    : QMainWindow(parent){    ui.setupUi(this);    //连接信号与槽.    connect(ui.startButton, SIGNAL(clicked()), this, SLOT(startTimerSlot()));    connect(ui.stopButton, SIGNAL(clicked()), this, SLOT(stopTimerSlot()));}c::~c(){}void c::timerEvent(QTimerEvent*event){    //判断当前定时器对应的是哪个ld.    if (event->timerId() == this->m_lamp)    {        if (this->m_lampStatus == false)        {            //设置按钮的图标.            ui.toolButton->setIcon(QIcon("Icons/lamp.png"));            this->m_lampStatus = true;        }        else        {            ui.toolButton->setIcon(QIcon("Icons/space.png"));             this->m_lampStatus = false;        }    }}void c::startTimerSlot(){    //设置定时器，返回一个timerld.注意单位为毫秒，1000毫秒等于1秒.    this->m_lamp = this->startTimer(1000);}void c::stopTimerSlot(){    //停止定时器.    this->killTimer(this->m_lamp);}

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以下是”c.h”的代码:

#ifndef C_H#define C_H#include <QtWidgets/QMainWindow>#include "ui_c.h"#include <QLabel>#include <QTimerEvent>class c : public QMainWindow{    Q_OBJECTpublic:    c(QWidget *parent = 0);    ~c();protected:    //这是一个虚函数，从QEvent继承而来.    void timerEvent(QTimerEvent*event);private slots:    void startTimerSlot();    void stopTimerSlot();private:    Ui::cClass ui;    int m_lamp;    bool m_lampStatus = false;};#endif // C_H

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最后是”main.cpp”的代码:

#include "c.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    c w;    w.show();    return a.exec();}