Add widget on qlistwidgetitem

1、 additional widget No display

These two sentences cannot be reversed ：
        listWidget>addItem(newItem);
        listWidget->setItemWidget(newItem, itemWidget);

2、 additional widget The position has shifted

QListWidget Dynamic increase item Under the way , by item Additional widget A position shift may occur .

The solution is to associate a delegate , This delegate does not need to be attached to widget It matters , Just reload updateEditorGeometry Function .

XItemDelegate.h

#ifndef XITEMDELEGATE_H
#define XITEMDELEGATE_H

#include <QStyledItemDelegate>

class XItemDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    explicit XItemDelegate(QWidget *parent = nullptr);

    virtual void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;

signals:

public slots:
};

#endif // XITEMDELEGATE_H

XItemDelegate.cpp

#include "XItemDelegate.h"

XItemDelegate::XItemDelegate(QWidget *parent)
{

}


void XItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    editor->setGeometry(option.rect);
}

XItemDelegate*   itemDelegate = new XItemDelegate();
listWidget->setItemDelegate(itemDelegate);