QTimer

Qt基础:定时器

使用QTimerEvent的timerId()函数来获取定时器的编号,然后根据不同编号处理不同操作.

2

Demo

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>

namespace Ui {
class widget;
}
class QLCDNumber;
class QDateTimeEdit;

class widget : public QWidget
{
Q_OBJECT
public:
widget(QWidget *parent = 0);
~widget();
protected:
void timerEvent(QTimerEvent *event);
private slots:
//定时器溢出处理
void timerUpdate();
private:
Ui::widget *ui;
//获取定时器编号
int id1;
int id2;
int id3;
QLCDNumber *lcdNumber;
QDateTimeEdit *dtEdit;
};

////////////////////////////////////////////////////
#include <QtGui>
#include "widget.h"
#include "ui_widget.h"

widget::widget(QWidget *parent) : QWidget(parent),
ui(new Ui::widget)
{
ui->setupUi(this);
//1` 开启三个定时器,返回其ID
id1 = startTimer(1000);
id2 = startTimer(2000);
id3 = startTimer(3000);

//2` 创建新的定时器
QTimer *timer = new QTimer(this);
//关联
connect(timer, SIGNAL(timeout()), this, SLOT(timerUpdate()));
timer->start(1000);

lcdNumber = new QLCDNumber(this);
//设置样式
lcdNumber->resize(100,22);
//显示8个字符
lcdNumber->setDigitCount(8);
//Outline,轮廓突出，颜色为背景色；Filled，内部填充型，颜色为黑色；Flat,平面型
lcdNumber->setSegmentStyle(QLCDNumber::Flat);
//设置背景色
lcdNumber->setStyleSheet("background-color:yellow");

dtEdit = new QDateTimeEdit(this);
dtEdit->setReadOnly(true);
dtEdit->move(200,0);

//随机数种子:两个时间点之间所有秒数
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
}

widget::~widget()
{
delete ui;
}

void widget::timerEvent(QTimerEvent *event)
{
if(event->timerId() == id1){
qDebug() << "timer1";
} else if(event->timerId() == id2){
qDebug() << "timer2";
} else {
qDebug() << "timer3";
}
}

void widget::timerUpdate()
{
//    QTime time = QTime::currentTime();  //获取当前时间
//    QString text = time.toString("hh:mm");  //转换为字符串
//    if((time.second() % 2) == 0) {
//        text[2] = ' ';  //每隔1s ':' 换成空格
//    }
//    lcdNumber->setText(text);
lcdNumber->display(QTime::currentTime().toString("hh:mm:ss"));
dtEdit->setDateTime(QDateTime::currentDateTime());

int rand = qrand() % 300;
//动画效果
lcdNumber->move(rand,rand);
}