Qt label自适应窗体大小

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QImage>

#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    ui->label->setScaledContents(true);

    ui->frame->setStyleSheet( "background: rgb(173, 202, 232)");

    QPixmap image;

    image.load(":image/dxAgv.jpg");

    image = image.scaled(ui->label->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);//放缩图片，以固定大小显示

    ui->label->setPixmap(image);//在Label控件上显示图片

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::paintEvent(QPaintEvent *)

{

    ui->label->resize(ui->widget->size());

  //  ui->frame->move(0,0);

}