Qtimer event Slot 1 minute before
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How can I set a timer that run an event slot 1 minute before of signal event
for example in mainwindow:
@
Qtimer *timer9 = new Qtimer(this);
connect(timer9, SIGNAL(timeout()), this, SLOT(arrivopullman()));
timer9->start(180000); // 3 minutes
@@
void MainWindow::arrivopullman(){
/* if timer9:value = timer:value - 120000{
ui->label2->show();
}
if timer9:value=180000
ui->label2->close();
ui->label5->show();
}
*/
}
@I would not put 2-3 different timers, I would do it all with one, is possible?
thanks for help
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How should the new timer know when an event is signaled?
In your case you probably mean you like to have a trigger after 2 min and after 3 min. there are different implementations possible. But you need to trigger first the 2 min event with a timer. In the slot of this event you can set for instance a single shot timer for starting the 3min event.
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in this image is easier to understand what I wanna do:
!http://img198.imageshack.us/img198/5408/immagineogj.jpg(Click here)!
at 2 minute to do
ui->label2->show();
at 3 minute to do
ui->label2->close();
ui->label3->show(); -
I though that you were trying something like this.
Personally I would write two slot methods. Use a singleshot timer to start the 2min slot and start then the first time a regular 3 min timer starting starting always this slot again. Every time the 2min slot is triggered it start a singleshot timer with 60 seconds. This singleshot timer shall trigger the 3min slot.
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I'd even suggested having 2 slots and in slot#1 you start with single-shoting slot#2 in one sec, also in slot#2 you will make a single-shot for slot#1 that comes in 2 sec... Like so:
@#include "mainwindow.hpp"
#include "ui_mainwindow.h"#include <QTimer>
const int delay1 = 2000, delay2 = 1000;
quint64 Counter = 0; // a counter of passed time for this exampleMainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);// lets say we have a label on form, and we show Counter value
ui->lblShots->setText(QString("%1").arg(Counter));// sequence hasshin
QTimer::singleShot(delay1, this, SLOT(slot1()));
}MainWindow::~MainWindow()
{
delete ui;
}void MainWindow::slot1()
{
// a requesting the next shot
QTimer::singleShot(delay2, this, SLOT(slot2()));// here we do whatever business we have
Counter += delay1;
ui->lblShots->setText(QString("%1").arg(Counter));
}
void MainWindow::slot2() // same here
{
QTimer::singleShot(delay1, this, SLOT(slot1()));Counter += delay2;
ui->lblShots->setText(QString("%1").arg(Counter));
}@