how do I a QEvent::RequestSoftwareInputPanel event in my code - c++

Question

I am using an embedded platform to code using the Qt framework not Qt creator but it causes problems when I try to run my code I just set the size of my screen and it cause my player character to no longer take any inputs anymore I looked up the problem on Qt website and I found what I need to do use the QEvent::requestsoftwareinputpanel but I don't know how to implement it.
I tried to replace the original code that took inputs but it kept breaking when I tried it
here is my code
this is the main file
#include <QApplication>
#include <QGraphicsScene>
#include "Rect.h"
#include <QGraphicsView>
int main(int argc, char *argv[]){
QApplication a(argc,argv);
//how to make a screen
QGraphicsScene * scene1 = new QGraphicsScene();
// an item to put into the scene
Rect * player = new Rect();
player->setRect(0,0,100,100);
// focus on item
player->setFlag(QGraphicsItem::ItemIsFocusable);
player->setFocus();
//add item to the scene
scene1->addItem(player);
//how to actually see the scene
QGraphicsView * view = new QGraphicsView(scene1);
view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
// setting screensize
scene1->setSceneRect(0,0,800,600);
view->setBaseSize(800,600);
view->show();
//setting player pos
player->setPos(view->width()/2,view->height() - player->rect().height());
return a.exec();
}
the header file for the movment
//
// Created by krris on 2022-12-07.
//
#ifndef GALAGA_RECT_H
#define GALAGA_RECT_H
#include <QGraphicsRectItem>
#include <QEvent>
class Rect: public QGraphicsRectItem{
void keyPressEvent(QKeyEvent * event);
};
#endif //GALAGA_RECT_H
the file with the code for the movment
//
// Created by krris on 2022-12-07.
//
#include "Rect.h"
#include <QKeyEvent>
#include <QGraphicsScene>
#include "Bullet.h"
#include <QEvent>
void Rect::keyPressEvent(QKeyEvent * event){
if (event->key() == Qt::Key_Left){
QEvent::RequestSoftwareInputPanel;
setPos(x()-10,y());
}
else if (event->key() == Qt::Key_Right){
setPos(x()+10,y());
}
else if (event->key() == Qt::Key_Space){
// create a bullet
Bullet * bullet = new Bullet();
bullet->setPos(x(),y());
scene()->addItem(bullet);
}
}