Indicator

[gauravsharma0190]

hello there
I want to make an indicator. Mean When i Push the button, a green indicator see on my panel and if stop it i sees a red indicator there. So how to do that .Tell me
Thank you.

[mrjj]

Hi
You could use a QLabel and show image?
Just have a red/green image and use the setPixmap of QLabel
when you push buttons.

[gauravsharma0190]

Hello sir
i worte it like this
void mainwindow::on_start_button
{
QPixmap pix("/home/pi/Desktop/green.jpg")
Qpixmap p("/home/pi/Desktop/red.jpg")
ui->label->setPixmap(pix);
.......
.......
Do some process....
....
Now
ui->label->setPixmap(p);
}
but when i push the button it won't change the label.

[Ratzz]

@gauravsharma0190
I hope you use two pushbutton , one to start and one to stop?

void mainwindow::on_start_button
{
QPixmap pix("/home/pi/Desktop/green.jpg")
ui->label->setPixmap(pix);
.......
.......
Do some process....
....
}

void mainwindow::on_stop_button
{
QPixmap  p("/home/pi/Desktop/red.jpg")
ui->label->setPixmap(p);
.......
Do some process....
....
}

[gauravsharma0190]

Yes i did same as you do but it didn't work for me .
i don't understand where is the problem.
i take a label name as label and put it blank ...
But it doesn't change the .jpg files.

[gauravsharma0190]

@mrjj
How could i do that.
i just do it like this
void mainwindow::on_start_button
{
QPixmap pix("/home/pi/Desktop/green.jpg")
Qpixmap p("/home/pi/Desktop/red.jpg")
ui->label->setPixmap(pix);
.......
.......
Do some process....
....
Now
ui->label->setPixmap(p);
}
but when i push the button it won't change the label.

[Kambiz]

This code works correctly.

void MainWindow::on_startButton_clicked()
{
    ui->label->setPixmap(QPixmap(":/img/online.png"));
//do somthing...


}

void MainWindow::on_stopButton_clicked()
{
    ui->label->setPixmap(QPixmap(":/img/offline.png"));
//do somthing...
}

[Ratzz]

@gauravsharma0190
Show me the exact code.

[mrjj]

@gauravsharma0190 said in Indicator:

Hi
When you do it in same function it dont really
work as u think as it never get time to draw.

void mainwindow::on_start_button
{
QPixmap pix("/home/pi/Desktop/green.jpg")
Qpixmap p("/home/pi/Desktop/red.jpg")
ui->label->setPixmap(pix); <<<<<<<<<<<<<<< prepare to draw it
Do some process....
Here the other is still not drawn
ui->label->setPixmap(p); <<<<<< prepare to draw this
}

You can try to insert
..
ui->label->setPixmap(pix);
qApp->processEvents();

and it should change but would be better to with signals and slot as the other suggest.

http://www.informit.com/articles/article.aspx?p=1405544&seqNum=3

Also , do not use path like
/home/pi/Desktop/green.jpg
As it will stop working.
Use a resource file.
http://www.bogotobogo.com/Qt/Qt5_Resource_Files.php