QT QListWidget删除item和插入widget

main.cpp
#include <Qapplication>#include <QDialog>#include <QLabel>#include <QTextCodec>#include "demo.h"int main(int argc, char* argv[]){    QApplication a(argc,argv);    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());    demo *w = new demo;    w->show();    return a.exec();}
demo.cpp
#include "demo.h"demo::demo(QWidget *parent) :    QDialog(parent){    //添加Item    QStringList strList;    strList<<"Item1"<<"Item2"<<"Item3"<<"Item4"<<"Item5";    listWidget = new QListWidget;    listWidget->addItems(strList);       //向QListWidget中添加items    //在QListWidget中添加按钮    QWidget *widget = new QWidget;    QHBoxLayout *listWidgetlayout = new QHBoxLayout(widget);    QLabel *label = new QLabel(tr("放入QListWidget中"));    QPushButton *btn = new QPushButton(tr("QListWidget中的按钮"));    listWidgetlayout->addWidget(label);    listWidgetlayout->addWidget(btn);    widget->setLayout(listWidgetlayout);    QListWidgetItem *listitem = new QListWidgetItem;    listWidget->addItem(listitem);    listWidget->setItemWidget(listitem, widget);    listitem->setSizeHint(QSize(0, 40));    widget->show();    //清空和删除按钮    deletebtn = new QPushButton(tr("删除"));    clearbtn = new QPushButton(tr("清空"));    QHBoxLayout *btnlayout = new QHBoxLayout;    btnlayout->addStretch(1);    btnlayout->addWidget(deletebtn);    btnlayout->addStretch(1);    btnlayout->addWidget(clearbtn);    btnlayout->addStretch(1);    QVBoxLayout *layout = new QVBoxLayout;    layout->addWidget(listWidget);    layout->addLayout(btnlayout);    setLayout(layout);    connect(listWidget, SIGNAL(itemSelectionChanged()), this, SLOT(items()));   //选中的item发生变化时执行items()    connect(deletebtn, SIGNAL(clicked(bool)), this, SLOT(deleteitem()));    connect(clearbtn, SIGNAL(clicked(bool)), this, SLOT(clearListWidget()));}demo::~demo(){}void demo::deleteitem(){    if(0 == listWidget->count())    //获取items数量，当QListWidget中没有item时返回        return;    itemlist = listWidget->currentItem();    str = itemlist->text();     //获取当前选中item字符串    int i=0;    itemlist1 = listWidget->item(i);    str1 = itemlist1->text();   //获取索引为0的item字符串    while(str1 != "")       //删除选中的item    {        itemlist1 = listWidget->item(i);        str1= itemlist1->text();        if(str == str1)        {            listWidget->removeItemWidget(itemlist1);            delete itemlist1;            return;        }        ++i;    }}void demo::clearListWidget(){    listWidget->clear();    //清空items}void demo::items(){    qDebug()<<"items()";}demo.h
#ifndef DEMO_H#define DEMO_H#include <QListWidget>#include <QLayout>#include <QDialog>#include <QPushButton>#include <QDebug>#include <QLabel>class demo : public QDialog{    Q_OBJECTpublic:    explicit demo(QWidget *parent = 0);    ~demo();public slots:    void deleteitem();    void items();    void clearListWidget();PRivate:    QString str;    QString str1;    QListWidgetItem *itemlist;    QListWidgetItem *itemlist1;    QPushButton *deletebtn;    QPushButton *clearbtn;    QListWidget *listWidget;};#endif // DEMO_H
运行结果图：