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_OBJECT

public:
    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：