QListView nonstandard use problem (use different model problem)

[mars_tl]

I want switch different ctl in QListView when I clicked different button

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QStandardItem>
#include <QStandardItemModel>
#include <QList>
#include <QRadioButton>
#include <QCheckBox>
#include <QListView>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void on_pushButton_clicked();
 
    void on_pushButton_2_clicked();
 
    void on_listView_clicked(const QModelIndex &index);
 
private:
    Ui::MainWindow *ui;
    void init();
    QListView *plist;
    QStandardItemModel *modelcheck;
    QStandardItemModel *modelradio;
    QList<QRadioButton*> lvradio;
    QList<QCheckBox*> lvcheck;
 
};

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QStandardItem>
#include <QStandardItemModel>
#include <QList>
#include <QRadioButton>
#include <QCheckBox>
#include <QListView>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_listView_clicked(const QModelIndex &index);

private:
    Ui::MainWindow *ui;
    void init();
    QListView *plist;
    QStandardItemModel *modelcheck;
    QStandardItemModel *modelradio;
    QList<QRadioButton*> lvradio;
    QList<QCheckBox*> lvcheck;

};

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#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    init ();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::init() {
 
    plist = ui->listView;
    modelcheck = new QStandardItemModel();
    modelradio = new QStandardItemModel();
 
    for (int i = 0; i < 10; ++i) {
        QRadioButton *p = new QRadioButton(QString("radio") + QString::number (i));
        lvradio.push_back (p);
        modelradio->appendRow (new QStandardItem(""));
    }
 
    for (int i = 0; i < 11; ++i) {
        lvcheck.push_back (new QCheckBox(QString("check") + QString::number (i)));
        modelcheck->appendRow (new QStandardItem(""));
    }
}
 
void MainWindow::on_pushButton_clicked() {
    plist->setModel (modelcheck);
    for (int i = 0; i < modelcheck->rowCount (); ++i) {
        lvcheck.at (i)->show ();
        plist->setIndexWidget (modelcheck->index (i, 0), lvcheck.at (i));
    }
}
 
void MainWindow::on_pushButton_2_clicked() {
    plist->setModel (modelradio);
    for(int i = 0; i < modelradio->rowCount (); i++) {
        plist->setIndexWidget (modelradio->index (i, 0), lvradio.at (i));
        //here when use new QRadioButton("aa"); it works right 
    }
}
 
void MainWindow::on_listView_clicked(const QModelIndex &index) {
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    init ();
}

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

void MainWindow::init() {

    plist = ui->listView;
    modelcheck = new QStandardItemModel();
    modelradio = new QStandardItemModel();

    for (int i = 0; i < 10; ++i) {
        QRadioButton *p = new QRadioButton(QString("radio") + QString::number (i));
        lvradio.push_back (p);
        modelradio->appendRow (new QStandardItem(""));
    }

    for (int i = 0; i < 11; ++i) {
        lvcheck.push_back (new QCheckBox(QString("check") + QString::number (i)));
        modelcheck->appendRow (new QStandardItem(""));
    }
}

void MainWindow::on_pushButton_clicked() {
    plist->setModel (modelcheck);
    for (int i = 0; i < modelcheck->rowCount (); ++i) {
        lvcheck.at (i)->show ();
        plist->setIndexWidget (modelcheck->index (i, 0), lvcheck.at (i));
    }
}

void MainWindow::on_pushButton_2_clicked() {
    plist->setModel (modelradio);
    for(int i = 0; i < modelradio->rowCount (); i++) {
        plist->setIndexWidget (modelradio->index (i, 0), lvradio.at (i));
        //here when use new QRadioButton("aa"); it works right 
    }
}

void MainWindow::on_listView_clicked(const QModelIndex &index) {

}

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plist->setIndexWidget (modelcheck->index (i, 0), new QCheckBox("xxx"));

plist->setIndexWidget (modelcheck->index (i, 0), new QCheckBox("xxx"));

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1.everytime I use new does it memleaks ?
2.why setIndexwidget(...) revive a SIGTERM

[Santosh Reddy]

setIndexWidget() will delete the widget already set on the index, so setting a checkbox will first delete the exisiting widget. Storing the widgets in lvcheck and lvradio are no more valid (already deleted)

[mars_tl]

setIndexWidget() will delete the widget already set on the index, so setting a checkbox will first delete the exisiting widget. Storing the widgets in lvcheck and lvradio are no more valid (already deleted)

Thanks a lot .

void qabstractitemview::setindexwidget(const qmodelindex &index, qwidget *widget)
{
    q_d(qabstractitemview);
    if (!d->isindexvalid(index))
        return;
    if (qwidget *oldwidget = indexwidget(index)) {
        d->persistent.remove(oldwidget);    //here remove the oldwidget..
        d->removeeditor(oldwidget);
        oldwidget->deletelater();
    }
    if (widget) {
        widget->setparent(viewport());
        d->persistent.insert(widget);
        d->addeditor(index, widget, true);
        widget->show();
        datachanged(index, index); // update the geometry
        if (!d->delayedpendinglayout)
            widget->setgeometry(visualrect(index));
    }
}

void qabstractitemview::setindexwidget(const qmodelindex &index, qwidget *widget)
{
    q_d(qabstractitemview);
    if (!d->isindexvalid(index))
        return;
    if (qwidget *oldwidget = indexwidget(index)) {
        d->persistent.remove(oldwidget);    //here remove the oldwidget..
        d->removeeditor(oldwidget);
        oldwidget->deletelater();
    }
    if (widget) {
        widget->setparent(viewport());
        d->persistent.insert(widget);
        d->addeditor(index, widget, true);
        widget->show();
        datachanged(index, index); // update the geometry
        if (!d->delayedpendinglayout)
            widget->setgeometry(visualrect(index));
    }
}

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I find some code in qt src...