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(,"win1");
     list->insertItem(,"win2");
     list->insertItem(,"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();//设置边框
     qhl->setSpacing();//设置间隔
     qhl->addWidget(list);//加入list
     qhl->addWidget(stack,,Qt::AlignCenter);//加入stack
     qhl->setStretchFactor(stack,);//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)));
 }