//main.cpp

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

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

    return a.exec();
}

//dockwindow.h

#ifndef DOCKWINDOWS_H

#define DOCKWINDOWS_H

#include <QMainWindow>

class DockWindows : public QMainWindow

{

    Q_OBJECT

public:

    DockWindows(QWidget *parent = 0);

    ~DockWindows();

};

#endif // DOCKWINDOWS_H

//dockwindow.cpp
#include "dockwindows.h"
#include<QTextEdit>
#include<QDockWidget>

DockWindows::DockWindows(QWidget *parent)
    : QMainWindow(parent)
{

    setWindowTitle(tr("DockWindows"));	//设置主窗口的标题文字
    QTextEdit *te=new QTextEdit(this);	//定义一个QTextEdit对象作为主窗口
    te->setText(tr("Main Window"));
    te->setAlignment(Qt::AlignCenter);
    setCentralWidget(te);               //将此编辑框设为主窗口的中央窗体
    //停靠窗口1
    QDockWidget *dock=new QDockWidget(tr("DockWindow1"),this);
    dock->setFeatures(QDockWidget::DockWidgetMovable);            //可移动
    dock->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);
    QTextEdit *te1 =new QTextEdit();
    te1->setText(tr("Window1,The dock widget can be moved between docks by the user" ""));
    dock->setWidget(te1);
    addDockWidget(Qt::RightDockWidgetArea,dock);

    //停靠窗口2
    dock=new QDockWidget(tr("DockWindow2"),this);
    dock->setFeatures(QDockWidget::DockWidgetClosable|QDockWidget::DockWidgetFloatable); //可关闭，可浮动
    QTextEdit *te2 =new QTextEdit();
    te2->setText(tr("Window2,The dock widget can be detached from the main window,""and floated as an independent window, and can be closed"));
    dock->setWidget(te2);
    addDockWidget(Qt::RightDockWidgetArea,dock);
    //停靠窗口3
    dock=new QDockWidget(tr("DockWindow3"),this);
    dock->setFeatures(QDockWidget::AllDockWidgetFeatures);     //全部特性
    QTextEdit *te3 =new QTextEdit();
    te3->setText(tr("Window3,The dock widget can be closed, moved, and floated"));
    dock->setWidget(te3);
    addDockWidget(Qt::RightDockWidgetArea,dock);
}

DockWindows::~DockWindows()
{

}

停靠窗口，顾名思义，便是停靠在界面边缘的一些窗口

值得注意的是：

dock->setFeatures(QDockWidget::DockWidgetMovable);            //可移动

dock->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);

通过这两个函数，设置dock的一些属性，

第一个表示设置停靠窗口的属性，比如可移动，浮动，等等

第二个表示设置停靠窗口的停留位置，左边，右边