所以我想要的只是用计时器增加进度条。但不知何故,它增加了进度条的数量。
mainwindow.h:
Class MainWindow {
//...
private slots:
//...
void update();
private:
Ui::MainWindow *ui;
QTimer *timer;
unsigned int counter;
};
mainwindow.cpp:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
timer = new QTimer(this);
counter = 0;
connect(timer, SIGNAL(timeout()), this, SLOT( update() ) );
}
void MainWindow::on_actionStart_triggered()
{
if( ui->txtTime->text().isEmpty() || (ui->txtTime->text().toInt() == 0) )
{
QMessageBox::warning(this, "Error", "Could not start the timer.", QMessageBox::Ok);
return;
}
ui->cmdStart->setEnabled(false);
timer->start(ui->txtTime->text().toInt() * 60000 / 60);
}
void MainWindow::update()
{
counter++;
ui->progressBar->setValue( counter ); //Should be incremented by one
if( ui->progressBar->value() == 60 )
{
timer->stop();
Phonon::MediaObject *music = Phonon::createPlayer(Phonon::MusicCategory,
Phonon::MediaSource( ":/Music/" + ui->chkMusic->currentText() ));
music->play(); //Playing music
delete timer;
}
}
我注意到调试器的进度条值为6,而计数器只有值4.此外,它先增加1,然后是2,然后再增加2,然后再增加1,依此类推。我做错了什么?!
编辑: 我认为这是进度条。我把动作改为:
void MainWindow::on_actionStart_triggered()
{
if( ui->txtTime->text().isEmpty() || (ui->txtTime->text().toInt() == 0) )
{
QMessageBox::warning(this, "Error", "Could not start the timer.", QMessageBox::Ok);
return;
}
// ui->cmdStart->setEnabled(false);
// ui->progressBar->setMaximum( ui->txtTime->text().toInt() * 60 );
// timer->start( 1000 );
counter++;
ui->progressBar->setValue( counter );
}
自从我评论出来之后,没有计时器会启动。总是当我点击操作按钮时,它会将进度条增加1,然后是2,然后再增加2,然后再增加1.相同的行为。所以这不是计时器!
答案 0 :(得分:1)
我认为你不匹配QProgressBar值(minimum()和maximum()之间的整数)和显示的进度百分比,大致是(value-min)/(max-min)
楼层(1/60 * 100)= 1%
楼层(2/60 * 100)= 3%
楼层(3/60 * 100)= 5%
楼层(4/60 * 100)= 6%
因此,将值()递增1会增加序列的百分比:1%,2%,2%,1%...
如果要在计数器达到60时显示60%,则需要setMaximum(100)
我是对的吗?