Problem with using QHBoxLayout

Waxta

Hello.
I have dumb problem with QHBoxLayout. In constructor of my class I want to create an instance of this class, but compiler shows me a problem in line where I intend to create object: "Use of undefined type QHBoxLayout". Of course I included QHBoxLayout lib above, but compiler still shows me the error. How to fix it?```

#include <QHBoxLayout>

IEEEField::IEEEField(QWidget *parent) : QWidget(parent)
{
QHBoxLayout * layout = new QHBoxLayout();

SGaist

Hi and welcome to devnet,

What do you mean by "How to fix it" including QHBoxLayout is the right thing to do. The compiler can create stuff it doesn't know about.

Waxta

I mean how to make my code works :) I think I did everything correct but compiler gives me errors (I recognize that it's compiler error since error code beginning in C#### e.g C2027). I can give u more code if it's neccesary.

SGaist

What are the errors you are getting ?

Waxta

"use of undefined type QHBoxLayout"

SGaist

Well, the fix is to add #include <QHBoxLayout> in the file where you are using QHBoxLayout.

Waxta

Lawl, look at my first post :D I've done it already.

SGaist

You wrote Of course I included QHBoxLayout lib above, and there compiler does not show me error.

So there's something really not clear about your situation.

Waxta

ohhh, sorry :D propably I wanted to say something else, don't remember what :D Well, when I include QHBoxLayout it still does not work :/ What's the problem?

SGaist

Do you have QT += widgets in your .pro file ?

Waxta

Yep, I Have```
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

SGaist

The exact same error even when adding the include ? Where exactly are you adding it ?

Waxta

Yep, same error when adding. I add this file where I use it... if u mean that. :D!!![alt text]Screen(http://ifotos.pl/zobacz/errorzjpg_awhnwxr.jpg) of my other errors in compiler. These errors are in lines where I try to call foncions or do something with layouts.

SGaist

Show the code you are using, there's something else that's wrong.

Waxta

One of the file when I try to initiate HBoxLayout. Errors occur when I do something with layout var:

#include "ieeefield.h"
#include <QLineEdit>
#include "qbinaryvalidator.h"
#include <QHBoxLayout>

IEEEField::IEEEField(QWidget *parent) : QWidget(parent)
{
    QHBoxLayout * layout = new QHBoxLayout();
    QLineEdit * signField = new QLineEdit();
    QLineEdit * exponentField = new QLineEdit();
    QLineEdit * mantissField = new QLineEdit();

    signField->setAlignment(Qt::AlignCenter);
    exponentField->setAlignment(Qt::AlignCenter);
    mantissField->setAlignment(Qt::AlignCenter);

    signField->setMaxLength(1);
    exponentField->setMaxLength(8);
    mantissField->setMaxLength(23);

    QBinaryValidator * binaryValidator = new QBinaryValidator();
    signField->setValidator(binaryValidator);
    exponentField->setValidator(binaryValidator);
    mantissField->setValidator(binaryValidator);
    delete binaryValidator;

    QFont font;
    font.setPointSize(font.pointSize() + 8);
    signField->setFont(font);
    exponentField->setFont(font);
    mantissField->setFont(font);

    layout->addWidget(signField);
    layout->addWidget(exponentField);
    layout->addWidget(mantissField);
    delete signField;
    delete exponentField;
    delete mantissField;

    layout->setSpacing(5);
    this->setLayout(layout);
}

Waxta

U know guys, even the calculator example does not work (but I ran this example before and it worked) :D This must be an IDE fault. Any idea?

mrjj

@Waxta
Try to make a default GUI project and see if that works. Maybe add widget and layout to UI.

Waxta

https://doc.qt.io/qt-5/qtwidgets-widgets-calculator-example.html
I copied whole app but still having same problems (mainly with QGridLayout).

Edit: When i double-clicked on random error it reffered me to QHBoxLayout class declaration ![alt text] (http://ifotos.pl/zobacz/errorjpg_awhwxah.jpg)

mrjj

@Waxta
It seems to be inside Qt files?
Well testing with default project could also be interesting.

Waxta

I don't know. I just think the problem will be the same in other projects. The error started appear when I clicked "clear" in procject menu - actually don't know what this option clears XD