窗体部件之坐标和尺寸大小

关于控件坐标（相对以及绝对）以及大小获取方式有多种，使用场景自行尝试。

Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    setWindowFlags(Qt::FramelessWindowHint);}Widget::~Widget(){    delete ui;}void Widget::resizeEvent(QResizeEvent *event){    qDebug() << "resizeEvent()" << "\n";    qDebug() << "event->size(): " << event->size() << "\n";    qDebug() << "this's size:          " << this->size();    qDebug() << "       frameSize:     " << this->frameSize();    qDebug() << "       frameGeometry: " << this->frameGeometry();    qDebug() << "       geometry:      " << this->geometry();    qDebug() << "       rect:          " << this->rect();    qDebug() << "       pos:           " << this->pos() ;    qDebug() << "       mapToGlobal:   " << this->mapToGlobal(QPoint(0, 0)) << "\n";    qDebug() << "ui->listWidget->size:          " << ui->listWidget->size();    qDebug() << "                frameSize:     " << ui->listWidget->frameSize();    qDebug() << "                frameGeometry: " << ui->listWidget->frameGeometry();    qDebug() << "                geometry:      " << ui->listWidget->geometry();    qDebug() << "                rect:          " << ui->listWidget->rect();    qDebug() << "                pos:           " << ui->listWidget->pos() << "\n";}void Widget::moveEvent(QMoveEvent *event){    qDebug() << "moveEvent()";    qDebug() << "event->pos: " << event->pos();    qDebug() << "event->globalPos:" << mapToGlobal(event->pos());    qQNaN();}