Qwtslider layout - show current value

Question

i have a slider and apart from the scale that i was able to make it to be shown i want a label that shows me what's the current value of the slider, and when i slide it, it will change to the current position. Something like in this link from qwt.sorceforge.net

http://qwt.sourceforge.net/sliders.png

here's my slider code:

Slider = new QwtSlider(centralWidget);
Slider->setObjectName(QString::fromUtf8("Slider"));
Slider->setGeometry(QRect(520, 40, 60, 500));
QSizePolicy sizePolicy1(QSizePolicy::Expanding, QSizePolicy::Fixed);
sizePolicy1.setHorizontalStretch(0);
sizePolicy1.setVerticalStretch(0);
sizePolicy1.setHeightForWidth(Slider->sizePolicy().hasHeightForWidth());
Slider->setSizePolicy(sizePolicy1);
QFont font;
font.setFamily(QString::fromUtf8("Bitstream Charter"));
font.setPointSize(9);
Slider->setFont(font);
Slider->setCursor(QCursor(Qt::ArrowCursor));
Slider->setOrientation(Qt::Vertical);
Slider->setScalePosition(QwtSlider::LeftScale);
Slider->setBgStyle(QwtSlider::BgTrough);
Slider->setThumbLength(20);
Slider->setThumbWidth(10);
Slider->setBorderWidth(2);
Slider->setRange(xmin, xmax, step);
Slider->setScale(xmin, xmax+1, (xmax+1)/16);

I want my slider to show the current position in a label. – SamuelNLP Aug 23 '12 at 09:19 — SamuelNLP, Aug 23 '12 at 09:19

score 3 · Accepted Answer · answered Aug 23 '12 at 09:22

3

Connect the slider's valueChanged(int) signal with a slot of your own:

connect( slider, SIGNAL(valueChanged(int)), 
         someClassThatHasSlot, SLOT(setValueToTheLabel(int)) );

And in the slot just do something like

void setValueToTheLabel( int value )
{
    ui.yourLabel->setText( QString::number( value ) );
}

answered Aug 23 '12 at 09:22

SingerOfTheFall

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can i do that with a QLCDNumber as label? – SamuelNLP Aug 23 '12 at 09:24
1

@SamuelNLP, yes, of course, it even has the slot you need, `display(int)`, so you'll just need to connect the signal to the slot and it will work itself. – SingerOfTheFall Aug 23 '12 at 09:26

Qwtslider layout - show current value

1 Answers1