Unsolved Indicator
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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. -
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. -
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. -
@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.... .... }
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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. -
@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. -
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... }
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@gauravsharma0190
Show me the exact code. -
@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