How create method for get the child (QWebEngineView) of th curent view tab (QTabWidget)?

Question

I'm trying to make some project with QTabWidget (a litle browser and a text editor with multiple tab like notepad++) but I'm stuck in 2 project when I try to edit a value of widget (QWebEngine or QTextEdit) inside of QTabWidget. This is the code for the litle browser project:

fp.h :

#ifndef FP_H
#define FP_H

#include <QMainWindow>
#include <QWebEngineView>
#include <QWidget>
#include <QLabel>

QT_BEGIN_NAMESPACE
namespace Ui { class fp; }
QT_END_NAMESPACE

class fp : public QMainWindow
{
    Q_OBJECT

public:
    fp(QWidget *parent = nullptr);
    ~fp();

public slots:
    void newtab();
    void deltab();
    void newpage();
    QWebEngineView *ap();
    int cui();
private:
    Ui::fp *ui;
    QWebEngineView *webnav;

};
#endif // FP_H

fp.cpp

#include "fp.h"
#include "ui_fp.h"

fp::fp(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::fp)
{
    ui->setupUi(this);
    ui->in_url->setText("https://google.com");

}

fp::~fp()
{
    delete ui;
}

void fp::newtab()
{
QWebEngineView *webnav = new QWebEngineView;
webnav->load(QUrl("https://google.com"));
webnav->setObjectName("webnav");
ui->in_url->setText("https://google.com");
ui->onglet->addTab(webnav,"Home");
}
int fp::cui()
{
    return ui->onglet->currentIndex();
}
QWebEngineView *fp::ap()
{
    return ui->onglet->currentWidget()->findChild<QWebEngineView *>("webnav");
}
void fp::deltab()
{
    ui->onglet->removeTab(cui());
}

void fp::newpage()
{
    QString use_url = ui->in_url->text();
    ap()->load(use_url);
}

and there what look like the .ui Image of .ui in Qdesigner

I try to make work the method "ap" it should return the QWebEngineView child of current viewed tab but when I call the slots "newpage" (it currently using "ap" method) it just crash the application. This slot is trigered when I enter a new URL in the QLineEdit in .ui (before that I create a new tab whit a QWebEngineView inside whit the slot "newtab" )

void fp::newtab()
{
QWebEngineView *webnav = new QWebEngineView;
webnav->load(QUrl("https://google.com"));
webnav->setObjectName("webnav");
ui->in_url->setText("https://google.com");
ui->onglet->addTab(webnav,"Home");
}

So what wrong whit that line it the good method for get child widget of a QTabWidget? If it the good method what should be modified to make it work?

QWebEngineView *fp::ap()
{
    return ui->onglet->currentWidget()->findChild<QWebEngineView *>("webnav");
}

Answer 1

Try something like:

QWebEngineView *view = qobject_cast<QWebEngineView *>(
    this->ui->onglet->widget(0)
);

Note to put above somewhere in fp's methods (where you need the reference).

I could use ui->onglet->currentWidget(), but the difference is, that will not work once you have multiple tabs.