Qt5 Widget Properties from UI - c++

Question

I'm in the process of transitioning from PyQt5 to Qt5 in C++ and I'm having a bit of a tough time. I created a simple UI that contains a Qwidget called logo. I'm trying to make this widget an SVG rendering widget with this code:
QSvgRenderer renderer(QString(":/LogoSVG.svg"));
QImage image(500, 200, QImage::Format_ARGB32);
image.fill(0x000000);
QPainter painter(&image);
renderer.render(&painter);
In Python, I'd create a simple widget class that renders the SVG then in the UI form loader class I'd do
self.logo = SVGRender(self)
I'm trying to do the same thing in C++ Qt, so here's what I have so far and it's returning the error error: cannot convert ‘logoW’ to ‘QWidget*’ in assignment
example.h
#ifndef EXAMPLE_H
#define EXAMPLE_H
#include "ui_example.h"
class example : public QWidget
{
Q_OBJECT
public:
example(QWidget *parent = 0);
private:
Ui::example ui;
};
class logoW: public QWidget
{
Q_OBJECT
public:
logoW(QWidget *parent = 0);
};
#endif
example.cpp
#include <QtGui>
#include <QScreen>
#include <QApplication>
#include <QDesktopWidget>
#include <QCoreApplication>
#include <QSvgRenderer>
#include <QPainter>
#include <QImage>
#include <iostream>
#include "example.h"
using namespace std;
example::example(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
ui.logo = logoW(this)
}
logoW :: logoW(QWidget * parent = 0){
QSvgRenderer renderer(QString(":resources/LogoSvg.svg"));
QImage image(500, 200, QImage::Format_ARGB32);
image.fill(0xaaA08080);
QPainter painter(&image);
renderer.render(&painter);
}
Can someone show me what I'm doing wrong?

Answer 1

The variable ui.logo requires a pointer of the object, in your case it changes:
ui.logo = logoW(this);
to:
ui.logo = new logoW(this);
I also understand that you want to display the image in the logo widget. To do this you must implement the paintEvent method:
*.h
class logoW: public QWidget
{
Q_OBJECT
public:
logoW(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *event);
};
*.cpp
logoW::logoW(QWidget *parent):QWidget(parent)
{
}
void logoW::paintEvent(QPaintEvent *event){
Q_UNUSED(event)
QSvgRenderer renderer(QString(":resources/LogoSvg.svg"));
QPainter painter(this);
renderer.render(&painter);
}