基本垂直布局

垂直布局在垂直方向内设置对象。

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

#include <QMainWindow>
#include <QWidget>
#include <QVBoxLayout>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QMainWindow window;
    QWidget *widget = new QWidget(&window);
    QVBoxLayout *layout = new QVBoxLayout(widget);

    window.setCentralWidget(widget);
    widget->setLayout(layout);

    layout->addWidget(new QPushButton("hello world", widget));
    layout->addWidget(new QPushButton("I would like to have a layout !", widget));
    layout->addWidget(new QPushButton("layouts are so great !", widget));

    window.show();

    return a.exec();
}

输出：