How to provide auto change for a QTimeEdit? - qt

Question

I have a QTimeEdit widget on my dialog and I want to provide some kind of autochange - if the cursor is on minutes section and the time is 04:59, the next click on the arrow up would lead the time to change to 5:00.
How to do that?
I saw some mention of AutoAdvance property but I suppose it's obsolete because I cannot find it in Qt 4.7.

Answer 1

I noticed there is a signal called void timeChanged ( const QTime & time ). You can connect it to a slot and call function void QAbstractSpinBox::stepBy ( int steps ) in the slot function.
EDIT1:
Sorry for the misleading. In fact, we don't really need void timeChanged ( const QTime & time ).
See the code below:
class myTime : public QTimeEdit
{
Q_OBJECT
public:
virtual void stepBy(int steps)
{
if (this->time().minute()==59 && steps>0){
setTime(QTime(time().hour()+1,0,time().second(),time().msec()));
}else if(this->time().minute()==00 && steps<0){
setTime(QTime(time().hour()-1,59,time().second(),time().msec()));
}else{
QTimeEdit::stepBy(steps);
}
}
};
Keep in mind, you need to setWrapping(true) yourself.

Answer 2

I don't know whether it's still interesting, but I found another solution:
class myTime : public QTimeEdit {
Q_OBJECT public:
virtual void stepBy(int steps)
{
long lFactor=1;
if (currentSection()==QDateTimeEdit::MinuteSection)
lFactor=60;
else if (currentSection()==QDateTimeEdit::HourSection)
lFactor=3600;
long lDateTime = (dateTime().toMSecsSinceEpoch()/1000)+(steps*lFactor);
QDateTime dt = QDateTime::fromMSecsSinceEpoch(1000*(qint64)(lDateTime));
setDateTime(dt);
} };

Answer 3

If some one is wondering how to automatically change time (because I did), and needs easy, rather clean solution, here's what I came up with:
class TimeWidget : public QTimeEdit {
Q_OBJECT
public:
void stepBy(int steps) {
//Grab the current time
QTime t = time();
//So we edit the time as in raw milliseconds. Larger type would be better in this case.
//But 32bits is more than enough for day amount of milliseconds.
int raw = (t.hour()*360000 + t.minute()*60000 + t.second() * 1000 + t.msec());
//Let's find out what section time widget is changing
//And edit the raw millisecond data accordingly.
switch(currentSection()) {
case QDateTimeEdit::MSecSection:
raw += steps;
break;
case QDateTimeEdit::SecondSection:
raw += steps*1000;
break;
case QDateTimeEdit::MinuteSection:
raw+= steps*60000;
break;
case QDateTimeEdit::HourSection:
raw += steps*3600000;
break;
}
//Now we just split the "raw" milliseconds into
int hrs = (raw/ 36000000) % 24; //... hours
int mins = (raw/ 60000) % 60; //... minutes
int secs = (raw / 1000) % 60; //... seconds
int mills = raw % 1000; //... milliseconds
//Update & save the current time
t.setHMS(hrs, mins, secs, mills);
setTime(t);
}
};