我需要一些关于 Qtimer 使用的帮助。
我使用 Qt 5.0.2,这是我的问题:
我正在尝试开发一个定时器,界面很简单:
只有 2 个按钮:“开始”按钮,用于启动计时器,“暂停”按钮,以及用于显示时间的 QtimeEdit。
此屏幕截图显示了它的外观:http: //img834.imageshack.us/img834/1046/5ks6.png
问题是暂停功能不起作用。我在这里阅读了有关 Qtimer 的所有文档:http ://harmattan-dev.nokia.com/docs/library/html/qt4/qtimer.html 和这里:qt.developpez.com/doc/5.0-snapshot/qtimer/ ,但没有结果。
这是我拥有的源代码:(我只放了需要的东西)
// Creation of the Buttons and the time area
void MainWindow::createBottom()
{
bottom = new QWidget();
play = new QPushButton("Launch",this);
pause = new QPushButton("Pause",this);
play->setDisabled(false);
pause->setDisabled(true);
timeEdit = new QTimeEdit(this);
timeEdit->setDisplayFormat("mm:ss");
layout->addWidget(play);
layout->addWidget(pause);
layout->addWidget(timeEdit );
bottom->setLayout(layout);
connect(play, SIGNAL(clicked()), this, SLOT(startSimulation()));
connect(pause, SIGNAL(clicked()), this, SLOT(pauseSimulation()));
}
// to resume the timer where is was stopped
void MainWindow::resumeSimulation()
{
timer->blockSignals( false );
pause->setText("Pause");
pause->disconnect(SIGNAL(clicked()));
connect(pause, SIGNAL(clicked()), this, SLOT(pauseSimulation()));
paused = false;
timer->start();
int timeOfPause = time->restart();
int timeTotal = timeOfPause + timeElapsed;
time->addMSecs(-timeTotal);
}
// to Start the timer
void MainWindow::pauseSimulation()
{
timer->blockSignals(true);
pause->setText("Resume");
timer->stop();
play->setDisabled(false);
//pause->setDisabled(true);
pause->disconnect(SIGNAL(clicked()));
connect(pause, SIGNAL(clicked()), this, SLOT(resumeSimulation()));
paused = true;
}
// to Start the timer from zero.
void MainWindow::startSimulation()
{
timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this , SLOT(updateTime()));
timer->start(500);
play->setDisabled(true);
pause->setDisabled(false);
}
void MainWindow::updateTime()
{
if(time == NULL)
{
time = new QTime(0,0,0,0);
time->start();
}
//timeEdit->setTime(QTime::fromS(time->elapsed()));
//time = &(time->addMSecs(1000));
if(hasRestart)
{
time->restart();
time->addMSecs(-timeElapsed);
hasRestart = false;
}
else
{
timeElapsed =+ time->elapsed();
}
int seconds = 0;
int minutes = 0;
int hours = 0;
if(!paused)
{
seconds = (timeElapsed/1000)%60;
minutes = (timeElapsed/60000)%60;
hours = (timeElapsed/3600000)%24;
std::cout << "Test : " << hours << ":" << minutes << ":" << seconds << std::endl;
timeEdit->setTime(QTime(0,minutes,seconds,0));
timeEdit->update();
}
}
当我按下开始按钮时,计时器启动良好,但当我按下“暂停”时,它只会在图形界面上暂停,但当我恢复时,它会显示当前时间,就好像它没有暂停一样。
例如 :
我开始。我在 00:05 暂停。它显然阻止了计时器。我等待 10 秒。我恢复计时器,它显示 00:15 而不是 00:06
我该如何解决?
谢谢 !
编辑:谢谢 Kuba Ober,但你能解释一下你发布的代码吗?
暂停是如何工作的?