QT倒计时器与进度条

效果图：

源代码：

main.cpp

#include #include "mainwindow.h"

int main(int argc, char *argv[]) {

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

Mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include

#include

#include

#include

#include

#include

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow {

Q_OBJECT

public:

MainWindow(QWidget *parent = 0);

~MainWindow();

protected:

void changeEvent(QEvent *e);

private:

Ui::MainWindow *ui;

bool m_BStop;

int m_nPause;

QTimer *myTimer;

QDateTime CurDate;

private slots:

void on_StopLCDBtn_clicked();

void on_StartLCDBtn_clicked();

void on_StartBtn_clicked();

void ShowTimer();

};

#endif // MAINWINDOW_H

Mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

m_BStop=false;

m_nPause=0;

myTimer=new QTimer(this);

connect(myTimer,SIGNAL(timeout()),this,SLOT(ShowTimer()));

}

MainWindow::~MainWindow()

{

delete ui;

}

void MainWindow::changeEvent(QEvent *e)

{

QMainWindow::changeEvent(e);

switch (e->type()) {

case QEvent::LanguageChange:

ui->retranslateUi(this);

break;

default:

break;

}

}

void MainWindow::on_StartBtn_clicked()

{

bool ok=true;

int num = 100000;

int begin=m_nPause;

ui->progressBar->setRange(0,num);

for(int i = begin; i <= num; i++)

{

if(!m_BStop)

{

ui->progressBar->setValue(i);

m_nPause=i;

}else

{

ui->progressBar->setValue(i);

m_BStop=true;

}

}

QMessageBox::information(this,"Copy File","Finish",QMessageBox::Ok,QMessageBox::Ok); }

void MainWindow::on_StartLCDBtn_clicked()

{

CurDate=QDateTime::currentDateTime();

myTimer->start(1000);

}

void MainWindow::ShowTimer()

{

int wyy=31 - CurDate.secsTo(QDateTime::currentDateTime());

if(wyy >= 0)

{

ui->lcdNumber->display(wyy);

}else

{

on_StartBtn_clicked();

myTimer->stop();

}

}

void MainWindow::on_StopLCDBtn_clicked()

{

myTimer->stop();

}