如何在QMainWindow里使用setLayout()函数

QMainWindow并没有setLayout()函数，因此不能使用setLayout()函数来设置layout，需要使用间接的方法。

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QPushButton>

#include <QHBoxLayout>

#include <QLayout>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

     ui->setupUi(this);//这句话必须在最前面

    QPushButton  *pButton1 = new QPushButton("one");

    QPushButton  *pButton2 = new QPushButton("two");

    QPushButton  *pButton3 = new QPushButton("three");

    QPushButton  *pButton4 = new QPushButton("FOur");

    QPushButton  *pButton5 = new QPushButton("Five");

    QHBoxLayout *pHLayout = new QHBoxLayout();

    pHLayout->addWidget(pButton1);

    pHLayout->addWidget(pButton2);

    pHLayout->addWidget(pButton3);

    pHLayout->addWidget(pButton4);

    pHLayout->addWidget(pButton5);

//    QWidget *widget = new QWidget;

//    widget->setLayout(pHLayout);

//    this->setCentralWidget(widget);

    ui->centralWidget->setLayout(pHLayout);

}

MainWindow::~MainWindow()

{

    delete ui;

}