13.QT多窗口切换list

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    list = new QListWidget(this);
    list->insertItem(0,"win1");
    list->insertItem(1,"win2");
    list->insertItem(2,"win3");

    //用于传给stack
    label1=new QLabel("win1");
    label2=new QLabel("win2");
    label3=new QLabel("win3");

    //创建新的栈
    stack = new QStackedWidget(this);
    //添加
    stack->addWidget(label1);
    stack->addWidget(label2);
    stack->addWidget(label3);
    //创建HBoxLayout
    QHBoxLayout *qhl = new QHBoxLayout(this);
    qhl->setMargin(10);//设置边框
    qhl->setSpacing(5);//设置间隔
    qhl->addWidget(list);//加入list
    qhl->addWidget(stack,0,Qt::AlignCenter);//加入stack
    qhl->setStretchFactor(stack,1);//设置可拓展性,是否能随着窗口的变化大小发生相应的变化

    connect(list,SIGNAL(currentRowChanged(int)),stack,SLOT(setCurrentIndex(int)));
}