Qt使用QListWidget实现自定义Item

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
   Q_OBJECT

public:
   explicit MainWindow(QWidget *parent = nullptr);
   ~MainWindow();

private slots:
   // 添加项
   void on_btn_add_clicked();

private:
   Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

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

#include <QDebug>
#include <custemitem.h>

#include <QMessageBox>

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

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


void MainWindow::on_btn_add_clicked()
{
   QListWidgetItem* pItem = new QListWidgetItem("");
   ui->listWidget->addItem(pItem);

   custemItem* pCustomItem = new custemItem(pItem);
   ui->listWidget->setItemWidget(pItem, pCustomItem);
   ui->listWidget->setCurrentItem(pItem);

   connect(pCustomItem, &custemItem::emit_del, this, [&](QListWidgetItem* pItem){
       QMessageBox::StandardButton btn = QMessageBox::information(this, QStringLiteral("提示"), QStringLiteral("是否删除？"), QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
       if(QMessageBox::No == btn)
           return;
       ui->listWidget->removeItemWidget(pItem);
       delete pItem;
       pItem = nullptr;
   });
}

#ifndef CUSTEMITEM_H
#define CUSTEMITEM_H

#include <QWidget>
#include <QListWidgetItem>

namespace Ui {
class custemItem;
}

class custemItem : public QWidget
{
    Q_OBJECT

public:
    explicit custemItem(QListWidgetItem* pItem, QWidget *parent = nullptr);
    ~custemItem();

signals:
    void emit_del(QListWidgetItem* pItem);

private slots:
    void on_pushButton_clicked();

private:
    Ui::custemItem *ui;
    QListWidgetItem* m_pItem;
};

#endif // CUSTEMITEM_H

#include "custemitem.h"
#include "ui_custemitem.h"
#include "defind.h"

custemItem::custemItem(QListWidgetItem* pItem, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::custemItem),
    m_pItem(pItem)
{
    ui->setupUi(this);
    ui->pushButton->setEnabled(false);

    int nRand = qrand()%4;
    ui->checkBox->setText(slText.at(nRand));
    ui->checkBox->setIcon(QIcon(slIcon.at(nRand)));


    connect(ui->checkBox, &QCheckBox::clicked, this, [=](){
       ui->pushButton->setEnabled(ui->checkBox->isChecked());
    });
}

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

void custemItem::on_pushButton_clicked()
{
    if(ui->checkBox->isChecked())
    {
        emit emit_del(m_pItem);
    }else{

    }
}

#ifndef DEFIND_H
#define DEFIND_H


#include <QStringList>
#include <QList>
#include <QIcon>

QStringList slText = {"12312312.mp3", "dfdafds.mp4", "zcvzcvzxv.txt", "asdfasdfafsafdf.avi"};
QList<QString> slIcon = {":/res/mp3.png", ":/res/mp4.png", ":/res/TXT.png", ":/res/Video.png"};


#endif // DEFIND_H

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}