Qt铆接部件、浮动窗口、中心部件

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDockWidget>
#include <QTextEdit>

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

    //铆接部件（浮动窗口）
    QDockWidget *dockWidget = new QDockWidget("dock widget", this);
    //设置允许停靠区域
    dockWidget->setAllowedAreas(Qt::BottomDockWidgetArea | Qt::TopDockWidgetArea);
    addDockWidget(Qt::BottomDockWidgetArea, dockWidget);

    //设置中心部件
    QTextEdit *textEdit = new QTextEdit(this);
    setCentralWidget(textEdit);
}