c++两种方法实现列表

实现效果

代码如下:

#include <QApplication>
#include <QWidget>
#include <QListWidget>
#include <QLabel>
#include <QListWidgetItem>

using namespace std;

class QMyLabel:public QLabel
{
    Q_OBJECT
    public slots:
        void rsetText(QListWidgetItem *item);
};

void QMyLabel::rsetText(QListWidgetItem *item){
    this->setText(item->text());
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //MainWindow w;
    //w.show();
    //创建一个窗口，作为输入框的父窗口
      QWidget widget;
    //设置窗口的标题
        widget.setWindowTitle("QWidget窗口");
        widget.resize(500,500);

         QListWidget listWidget(&widget);

         listWidget.resize(500,400);
         listWidget.setFont(QFont("宋体",14));
         listWidget.addItem("hello china");
         listWidget.addItem("hello beijing");
         listWidget.addItem(new QListWidgetItem("hello hangzhou"));

         QMyLabel ml;
             ml.setText("选中内容");
             ml.setParent(&widget);
             ml.resize(500,100);
             ml.move(0,400);
             ml.setAlignment(Qt::AlignCenter);


             QObject::connect(&listWidget,&QListWidget::itemClicked,&ml,&QMyLabel::rsetText);
                 widget.show();



    return a.exec();
}
#include "main.moc"

除了上面这种办法。还可以把类的声明放到头文件中
头文件如下

#ifndef M_H
#define M_H
#include <QLabel>
#include <QListWidgetItem>

class QMyLabel;

class QMyLabel:public QLabel
{
    Q_OBJECT
    public slots:
        void rsetText(QListWidgetItem *item);
};
#endif // M_H

main.cpp代码如下

#include "m.h"
#include <QApplication>
#include <QWidget>
#include <QListWidget>
#include <QLabel>
#include <QListWidgetItem>

using namespace std;



void QMyLabel::rsetText(QListWidgetItem *item){
    this->setText(item->text());
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //MainWindow w;
    //w.show();
    //创建一个窗口，作为输入框的父窗口
      QWidget widget;
    //设置窗口的标题
        widget.setWindowTitle("QWidget窗口");
        widget.resize(500,500);

         QListWidget listWidget(&widget);

         listWidget.resize(500,400);
         listWidget.setFont(QFont("宋体",14));
         listWidget.addItem("hello china");
         listWidget.addItem("hello beijing");
         listWidget.addItem(new QListWidgetItem("hello hangzhou"));

         QMyLabel ml;
             ml.setText("选中内容");
             ml.setParent(&widget);
             ml.resize(500,100);
             ml.move(0,400);
             ml.setAlignment(Qt::AlignCenter);


             QObject::connect(&listWidget,&QListWidget::itemClicked,&ml,&QMyLabel::rsetText);
                 widget.show();



    return a.exec();
}