Qt---为窗体添加滚动条：QScrollArea
#include ""
#include "ui_mainwindow.h"
#include <QScrollArea>
#include <QPushButton>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//滚动区域
QScrollArea *s = new QScrollArea(this);
s->setGeometry(0, 0, 200, 200);
//垂直滚动条不可见，只能通过鼠标滑动
s->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//窗体1，其父窗体为滚动区域
QWidget *w = new QWidget(s);
//设置滚动区域的窗体
s->setWidget(w);
w->setGeometry(0, 0, 300, 300);
//在窗体1上添加按钮
QPushButton *btn = new QPushButton(w);
btn->setText("123");
btn->move(230, 130);
}
MainWindow::~MainWindow()
{
delete ui;
}