slider and plus/minus signs

user4592357

i have a qslider object, on the left side of which i place "-" sign, on the right side a "+" sign. on the application they appear in separate "rectangles". what's the problem here? should i reimplement slider's paintEvent?

mrjj

Hi
How do you place them? QLabel?
While you can overlay widgets to some degree, if you scale window , it often goes broke.
So yes, painting theme will work better.

user4592357

but how do i actually paint that? i thought this would suffice but no:

void Slider::paintEvent(QPaintEvent *event) {
    QPainter painter(this);
    painter.setPen(QPen(Qt::SolidPattern, 1));
    painter.drawText(-5, height() / 2, QString("-"));
    painter.drawText(width() + 5, height() / 2, QString("+"));

    QSlider::paintEvent(event);
}

mrjj

Try move
QSlider::paintEvent(event);
to the top so base paints first and then you.
else it might override.

also drawText(-5, might not work as
you cant paint outside the area of the widget.
same with painter.drawText(width() + 5

you cant have them inside the widget ?

user4592357

that didn't help.

what do you mean? have a container that contains qlabel, qslider, qlabel?

mrjj

@user4592357
No, i mean draw them inside the widget. You give it x values that
is outside the clipping area. You cannot use negative value nor bigger
than width() to draw anything. You cannot paint outside a widget.

Maybe i misunderstood what you mean by
"appear in separate "rectangles"
Sounded like you did use a layout to make a composite widget but
wanted the +/- to overlap the slider area.

So do you want the +/- to be over the slider area or is right next to both side fine enough?

user4592357

i want "- slider +" to appear as one widget

mrjj

@user4592357

Hehe i must ask in a stupid way :)
So its ok that + and minus are right next to the slider and not over it ?
If yes, you can just use a layout to make stick together.
It would appear as one widget but plus and minus would be next to the slider and not on top /overlapping it.

Like this ?
alt text

To make:
Place widget on Form
place label with + and slider and label with - inside widget in right order.
not important if they are aligned.
Then right click a free area of the widget and select
Layout menu -> Layout horizontally

user4592357

@mrjj i think i'll just write the code :p will do tomorrow and see what i get, thanks!