How do I subclass QDial to show notches values ?

mrjj

before u try composite, please try adjust paint first.
So little code.

Punt

void QDial::paintEvent(QPaintEvent *)
{
QStylePainter p(this);
QStyleOptionSlider option;
initStyleOption(&option);
p.drawComplexControl(QStyle::CC_Dial, option);
}

So u can just change option.rect ( check name)
and you can control the size of the dial.

I can't do "option.something" ...

mrjj

why not?
Look in help then?

http://doc.qt.io/qt-5/qstyleoption.html#rect-var

Punt

@mrjj
Now the problem is I can extend the area and write text in the right and in the bottom of the QDial (because the QDial is drawn (good english ?!) in the left-top (0,0) ). And I don't have any idea how to change that.. I searched if there is something like the position where qt draw of something like that, but didn't find it .. --'

mrjj

hi
Not tested myself.
option.rect should control where QDial is
and the normal rect is your widget.

So if u set option.rect before
p.drawComplex

U should be able to move it around?

Punt

@mrjj
Look, if I

option.rect.setX(20)

this is just moving one part of the QDial --'
Gyazo

And what do you mean about the normal rect ?

The only rect I have is option.rect no ?!

mrjj

@Punt
Option has rect yes, used for the drawComplexControl call.
You own widget, also has rect, simply called rect or this->rect
which is the real area since the QDial is just painted.

Punt

@mrjj

    rect().setRect(0,0,200,200);
    option.rect.setRect(30,30,100,100);
    p.drawText(120,120,"(120,120)");
    p.drawText(30,30,"(30,30)");
    p.drawText(200,200,"(200,200)");

=> Gyazo

I don't find anything to move ticks ...

mrjj

Hmm
so it dont use option.rect() for the tick drawing.
Strange.

Alternatively
new a layout
set to your widget
New a QDial
add to layout
adjust layout margins to get room for text.
Paint the text in paintEvent.
Remove the drawComplexControl etc.

Punt

@mrjj
In my subclass ?

mrjj

@Punt
Yes
In constructor
so it becomes a composite widget with a normal QDial inside.
You will also have to create some public signal to use from outside
since you cannot directly connect to the QDail.

mrjj

Hi
yes that seems to be possible.

https://www.dropbox.com/s/5hjry2pcb0mpsi2/myqdial.zip?dl=0
I just did it in Creator for test. Using code in
CustomDial is smarter.

Punt

@mrjj

Sorry was busy...
I don't understand how to do it..
I tried, when I want to use layout() this is crashing.. I tried different things but isn't working, I'm tired of this button x)

mrjj

@Punt
Np.
Did u try test?
U must create layout first with new
and assign to ur widget
else
layout() returns null.
something like
QVBoxLayou *verticalLayout = new QVBoxLayout(this);
verticalLayout->setContentsMargins(32, 32, 32, 32);
QDial *dial = new QDial(this); ** might have this as class memeber
verticalLayout->addWidget(dial);

Punt

@mrjj said:

@Punt
Np.
Did u try test?
U must create layout first with new
and assign to ur widget
else
layout() returns null.
something like
QVBoxLayou *verticalLayout = new QVBoxLayout(this);
verticalLayout->setContentsMargins(32, 32, 32, 32);
QDial *dial = new QDial(this); ** might have this as class memeber
verticalLayout->addWidget(dial);

Ok that worked, thanks bro ! now I'll add my texts where I want :)

mrjj

super!
You might need to surface some of the signals from the QDial to make
it do anything usefull.

In this regards , please note that u -can- connect signals to signals
So you can define some new public signals and hook the new signals
to the QDial signals.
From outside u can then connect to the new signals.