Qt C++: how to add a simple countdown timer?
I'm new to Qt C++ and from the few resources I found online I wasn't able to extract only the bit I need to add a countdown timer to a form. I'm not trying to add any buttons or other functionality. Only need to have a timer starting at 1:00 and then decreasing until 0:00 is reached, at which point I need to show some sort of message indicating the user the time is up. I thought maybe adding a label to display the timer would be a simple way to do it (but now sure if I'm right on this).
So far I created a new Qt Application project, added a label to my main form and added some timer code to mainwindow.cpp from what I got at http://doc.qt.io/archives/qt-4.8/timers.html:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//Initialize "countdown" label text
ui->countdown->setText("1:00");
//Connect timer to slot so it gets updated
timer = new QTimer();
connect(timer, SIGNAL(timeout()), this, SLOT(updateCountdown()));
//It is started with a value of 1000 milliseconds, indicating that it will time out every second.
timer->start(1000);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updateCountdown()
{
//do something along the lines of ui->countdown->setText(....);
}
In mainwindow.h I added a QTimer *timer; as a public attribute and also void updateCountdown(); as a private slot.
But I'm not exactly sure about how to go on from here. I think the next step is to decrease the timer each second and show that on the "countdown" label (which would be done on the updateCountdown slot) but I can't find out how.
I'm also not sure how to trigger a message (maybe on a QFrame) when the countdown gets to 0:00.
c++ qt timer
asked Nov 24 '18 at 14:29
FloellaFloella
584419
add a comment |
I'm new to Qt C++ and from the few resources I found online I wasn't able to extract only the bit I need to add a countdown timer to a form. I'm not trying to add any buttons or other functionality. Only need to have a timer starting at 1:00 and then decreasing until 0:00 is reached, at which point I need to show some sort of message indicating the user the time is up. I thought maybe adding a label to display the timer would be a simple way to do it (but now sure if I'm right on this).
So far I created a new Qt Application project, added a label to my main form and added some timer code to mainwindow.cpp from what I got at http://doc.qt.io/archives/qt-4.8/timers.html:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//Initialize "countdown" label text
ui->countdown->setText("1:00");
//Connect timer to slot so it gets updated
timer = new QTimer();
connect(timer, SIGNAL(timeout()), this, SLOT(updateCountdown()));
//It is started with a value of 1000 milliseconds, indicating that it will time out every second.
timer->start(1000);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updateCountdown()
{
//do something along the lines of ui->countdown->setText(....);
}
In mainwindow.h I added a QTimer *timer; as a public attribute and also void updateCountdown(); as a private slot.
But I'm not exactly sure about how to go on from here. I think the next step is to decrease the timer each second and show that on the "countdown" label (which would be done on the updateCountdown slot) but I can't find out how.
I'm also not sure how to trigger a message (maybe on a QFrame) when the countdown gets to 0:00.
c++ qt timer
asked Nov 24 '18 at 14:29
FloellaFloella
584419
add a comment |
I'm new to Qt C++ and from the few resources I found online I wasn't able to extract only the bit I need to add a countdown timer to a form. I'm not trying to add any buttons or other functionality. Only need to have a timer starting at 1:00 and then decreasing until 0:00 is reached, at which point I need to show some sort of message indicating the user the time is up. I thought maybe adding a label to display the timer would be a simple way to do it (but now sure if I'm right on this).
So far I created a new Qt Application project, added a label to my main form and added some timer code to mainwindow.cpp from what I got at http://doc.qt.io/archives/qt-4.8/timers.html:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//Initialize "countdown" label text
ui->countdown->setText("1:00");
//Connect timer to slot so it gets updated
timer = new QTimer();
connect(timer, SIGNAL(timeout()), this, SLOT(updateCountdown()));
//It is started with a value of 1000 milliseconds, indicating that it will time out every second.
timer->start(1000);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updateCountdown()
{
//do something along the lines of ui->countdown->setText(....);
}
In mainwindow.h I added a QTimer *timer; as a public attribute and also void updateCountdown(); as a private slot.
But I'm not exactly sure about how to go on from here. I think the next step is to decrease the timer each second and show that on the "countdown" label (which would be done on the updateCountdown slot) but I can't find out how.
I'm also not sure how to trigger a message (maybe on a QFrame) when the countdown gets to 0:00.
c++ qt timer
asked Nov 24 '18 at 14:29
FloellaFloella
584419
I'm new to Qt C++ and from the few resources I found online I wasn't able to extract only the bit I need to add a countdown timer to a form. I'm not trying to add any buttons or other functionality. Only need to have a timer starting at 1:00 and then decreasing until 0:00 is reached, at which point I need to show some sort of message indicating the user the time is up. I thought maybe adding a label to display the timer would be a simple way to do it (but now sure if I'm right on this).
So far I created a new Qt Application project, added a label to my main form and added some timer code to mainwindow.cpp from what I got at http://doc.qt.io/archives/qt-4.8/timers.html:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//Initialize "countdown" label text
ui->countdown->setText("1:00");
//Connect timer to slot so it gets updated
timer = new QTimer();
connect(timer, SIGNAL(timeout()), this, SLOT(updateCountdown()));
//It is started with a value of 1000 milliseconds, indicating that it will time out every second.
timer->start(1000);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updateCountdown()
{
//do something along the lines of ui->countdown->setText(....);
}
In mainwindow.h I added a QTimer *timer; as a public attribute and also void updateCountdown(); as a private slot.
But I'm not exactly sure about how to go on from here. I think the next step is to decrease the timer each second and show that on the "countdown" label (which would be done on the updateCountdown slot) but I can't find out how.
I'm also not sure how to trigger a message (maybe on a QFrame) when the countdown gets to 0:00.
c++ qt timer
c++ qt timer
asked Nov 24 '18 at 14:29
FloellaFloella
584419
asked Nov 24 '18 at 14:29
FloellaFloella
584419
asked Nov 24 '18 at 14:29
FloellaFloella
584419
asked Nov 24 '18 at 14:29
FloellaFloella
584419
asked Nov 24 '18 at 14:29
FloellaFloella
584419
584419
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
From QTimer documentation, the function updateCountdown() is called every 1 second in your configuration. So you should decrease one second from your timer every time this function is called and update in the UI. Currently you are not storing your time anywhere, so I suggest you add it as a global for now, like QTime time(0, 1, 0) QTime Documentation.
Then inside updateCountdown(), call time.addSecs(-1); and then ui->countdown->setText(time.toString("m:ss"));. Then is easy to check if it is "0:00" and do something else.
I hope this helps
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added aQTime *time = new QTime(0, 1, 0)as a public attribute (as well as theQTimer *timerI already had). In the cpp file I added these two lines in the updateCountdown() slot:time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring aQTime* timein header and thentime = new QTime(0, 1, 0);in cpp. I didn't attempt the "when it gets to 0:00" yet.
– Floella
Nov 24 '18 at 23:11
You could check if theupdateCountdown()is actually being called every second by printing thetime->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.
– Lucas Mota
Nov 25 '18 at 3:19
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a publicQTime timeobject in my header file and then, in the MainWindow constructor I usedtime.setHMS(0,1,0)to initialize it. Then, like @LucasMota said, I calledtime=time.addSecs(-1)andui->countdown->setText(time.toString("m:ss"))within my updateCountdown() slot. I also change label initialization toui->countdown->setText(time.toString("m:ss"))in the MainWindow constructor. Thanks.
– Floella
Nov 26 '18 at 13:20
add a comment |
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From QTimer documentation, the function updateCountdown() is called every 1 second in your configuration. So you should decrease one second from your timer every time this function is called and update in the UI. Currently you are not storing your time anywhere, so I suggest you add it as a global for now, like QTime time(0, 1, 0) QTime Documentation.
Then inside updateCountdown(), call time.addSecs(-1); and then ui->countdown->setText(time.toString("m:ss"));. Then is easy to check if it is "0:00" and do something else.
I hope this helps
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added aQTime *time = new QTime(0, 1, 0)as a public attribute (as well as theQTimer *timerI already had). In the cpp file I added these two lines in the updateCountdown() slot:time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring aQTime* timein header and thentime = new QTime(0, 1, 0);in cpp. I didn't attempt the "when it gets to 0:00" yet.
– Floella
Nov 24 '18 at 23:11
You could check if theupdateCountdown()is actually being called every second by printing thetime->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.
– Lucas Mota
Nov 25 '18 at 3:19
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a publicQTime timeobject in my header file and then, in the MainWindow constructor I usedtime.setHMS(0,1,0)to initialize it. Then, like @LucasMota said, I calledtime=time.addSecs(-1)andui->countdown->setText(time.toString("m:ss"))within my updateCountdown() slot. I also change label initialization toui->countdown->setText(time.toString("m:ss"))in the MainWindow constructor. Thanks.
– Floella
Nov 26 '18 at 13:20
add a comment |
From QTimer documentation, the function updateCountdown() is called every 1 second in your configuration. So you should decrease one second from your timer every time this function is called and update in the UI. Currently you are not storing your time anywhere, so I suggest you add it as a global for now, like QTime time(0, 1, 0) QTime Documentation.
Then inside updateCountdown(), call time.addSecs(-1); and then ui->countdown->setText(time.toString("m:ss"));. Then is easy to check if it is "0:00" and do something else.
I hope this helps
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added aQTime *time = new QTime(0, 1, 0)as a public attribute (as well as theQTimer *timerI already had). In the cpp file I added these two lines in the updateCountdown() slot:time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring aQTime* timein header and thentime = new QTime(0, 1, 0);in cpp. I didn't attempt the "when it gets to 0:00" yet.
– Floella
Nov 24 '18 at 23:11
You could check if theupdateCountdown()is actually being called every second by printing thetime->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.
– Lucas Mota
Nov 25 '18 at 3:19
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a publicQTime timeobject in my header file and then, in the MainWindow constructor I usedtime.setHMS(0,1,0)to initialize it. Then, like @LucasMota said, I calledtime=time.addSecs(-1)andui->countdown->setText(time.toString("m:ss"))within my updateCountdown() slot. I also change label initialization toui->countdown->setText(time.toString("m:ss"))in the MainWindow constructor. Thanks.
– Floella
Nov 26 '18 at 13:20
add a comment |
From QTimer documentation, the function updateCountdown() is called every 1 second in your configuration. So you should decrease one second from your timer every time this function is called and update in the UI. Currently you are not storing your time anywhere, so I suggest you add it as a global for now, like QTime time(0, 1, 0) QTime Documentation.
Then inside updateCountdown(), call time.addSecs(-1); and then ui->countdown->setText(time.toString("m:ss"));. Then is easy to check if it is "0:00" and do something else.
I hope this helps
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
From QTimer documentation, the function updateCountdown() is called every 1 second in your configuration. So you should decrease one second from your timer every time this function is called and update in the UI. Currently you are not storing your time anywhere, so I suggest you add it as a global for now, like QTime time(0, 1, 0) QTime Documentation.
Then inside updateCountdown(), call time.addSecs(-1); and then ui->countdown->setText(time.toString("m:ss"));. Then is easy to check if it is "0:00" and do something else.
I hope this helps
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
answered Nov 24 '18 at 14:53
Lucas MotaLucas Mota
8817
8817
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added aQTime *time = new QTime(0, 1, 0)as a public attribute (as well as theQTimer *timerI already had). In the cpp file I added these two lines in the updateCountdown() slot:time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring aQTime* timein header and thentime = new QTime(0, 1, 0);in cpp. I didn't attempt the "when it gets to 0:00" yet.
– Floella
Nov 24 '18 at 23:11
You could check if theupdateCountdown()is actually being called every second by printing thetime->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.
– Lucas Mota
Nov 25 '18 at 3:19
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a publicQTime timeobject in my header file and then, in the MainWindow constructor I usedtime.setHMS(0,1,0)to initialize it. Then, like @LucasMota said, I calledtime=time.addSecs(-1)andui->countdown->setText(time.toString("m:ss"))within my updateCountdown() slot. I also change label initialization toui->countdown->setText(time.toString("m:ss"))in the MainWindow constructor. Thanks.
– Floella
Nov 26 '18 at 13:20
add a comment |
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added aQTime *time = new QTime(0, 1, 0)as a public attribute (as well as theQTimer *timerI already had). In the cpp file I added these two lines in the updateCountdown() slot:time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring aQTime* timein header and thentime = new QTime(0, 1, 0);in cpp. I didn't attempt the "when it gets to 0:00" yet.
– Floella
Nov 24 '18 at 23:11
You could check if theupdateCountdown()is actually being called every second by printing thetime->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.
– Lucas Mota
Nov 25 '18 at 3:19
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a publicQTime timeobject in my header file and then, in the MainWindow constructor I usedtime.setHMS(0,1,0)to initialize it. Then, like @LucasMota said, I calledtime=time.addSecs(-1)andui->countdown->setText(time.toString("m:ss"))within my updateCountdown() slot. I also change label initialization toui->countdown->setText(time.toString("m:ss"))in the MainWindow constructor. Thanks.
– Floella
Nov 26 '18 at 13:20
1
1
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
Maybe instead of global, make it a member variable?
– TrebuchetMS
Nov 24 '18 at 15:01
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
@TrebuchetMS Yes, was just thinking of using global for test purpose. Also, stopping/deleting the timer after it finished its objective so it doesn't waste CPU time would be nice.
– Lucas Mota
Nov 24 '18 at 15:12
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added a
QTime *time = new QTime(0, 1, 0) as a public attribute (as well as the QTimer *timer I already had). In the cpp file I added these two lines in the updateCountdown() slot: time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring a QTime* timein header and then time = new QTime(0, 1, 0); in cpp. I didn't attempt the "when it gets to 0:00" yet.– Floella
Nov 24 '18 at 23:11
I've tried this but I must be doing something wrong, as I do get my timer set to 1:00 but nothing else happens. In the header file I added a
QTime *time = new QTime(0, 1, 0) as a public attribute (as well as the QTimer *timer I already had). In the cpp file I added these two lines in the updateCountdown() slot: time->addSecs(-1); ui->countdown->setText(time->toString("m:ss"));. It seems I'm missing something, as nothing seems to be happening. I also tried just declaring a QTime* timein header and then time = new QTime(0, 1, 0); in cpp. I didn't attempt the "when it gets to 0:00" yet.– Floella
Nov 24 '18 at 23:11
You could check if the
updateCountdown() is actually being called every second by printing the time->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.– Lucas Mota
Nov 25 '18 at 3:19
You could check if the
updateCountdown() is actually being called every second by printing the time->toString("m:ss"). If it's being called and the output is right, maybe the ui is not being updated correctly.– Lucas Mota
Nov 25 '18 at 3:19
1
1
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a public
QTime time object in my header file and then, in the MainWindow constructor I used time.setHMS(0,1,0) to initialize it. Then, like @LucasMota said, I called time=time.addSecs(-1) and ui->countdown->setText(time.toString("m:ss")) within my updateCountdown() slot. I also change label initialization to ui->countdown->setText(time.toString("m:ss")) in the MainWindow constructor. Thanks.– Floella
Nov 26 '18 at 13:20
Well, finally got it to work but I wasn't able to use the QTime constructor. So instead I declared a public
QTime time object in my header file and then, in the MainWindow constructor I used time.setHMS(0,1,0) to initialize it. Then, like @LucasMota said, I called time=time.addSecs(-1) and ui->countdown->setText(time.toString("m:ss")) within my updateCountdown() slot. I also change label initialization to ui->countdown->setText(time.toString("m:ss")) in the MainWindow constructor. Thanks.– Floella
Nov 26 '18 at 13:20
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