QFrame 不会根据父小部件的大小调整调整其大小

我创建了一个小部件类。此类将维护 QFrame(QWidget 类型(的child_1和 QGridLayout 类型的child_2。child_2将为自己增加child_1。child_1将有一个QGridLayout类型的子级，最终QGridLayout将有一些按钮。

*我无法根据父小部件的调整调整QFrame子(child_1(的大小。另外，我正在尝试设置QFrame子级的大小，即父级的大小。即使这样也没有发生。我尝试使用方法setFrameRect((，setGeometry((和resize((。我已经实现了evenhandler resizeEvent(QResizeEvent event(。但是当应用程序运行时，我正在尝试调整小部件的大小，但我看到日志没有打印。

主.cpp

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

小部件.h

namespace Ui {
class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private:
    Ui::Widget *ui;
    QGridLayout* p_mPanelLayout; // Instance of QGridLayout.
    FrameDemo* framePtr;
};

小部件.cpp

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    p_mPanelLayout = new QGridLayout(this);
    framePtr = new FrameDemo(this);
    framePtr->createPushButtonUtility();
    p_mPanelLayout->addWidget(framePtr, 0, 0, Qt::AlignCenter);
}
Widget::~Widget()
{
    delete ui;
}

帧演示.h

#define LOG(message){
qDebug()<< __LINE__<<__FUNCTION__<<message<<"n";
 }
class FrameDemo : public QFrame
{
    Q_OBJECT
public:
    FrameDemo(QWidget *parent = 0);
    void createPushButtonUtility();
private:
    QGridLayout* m_pLayout;
protected:
    void resizeEvent(QResizeEvent * event);
};

帧演示.cpp

FrameDemo::FrameDemo(QWidget *parent):QFrame(parent)
{
    m_pLayout = new QGridLayout(this);
//    m_pLayout->setRowStretch(0, parent->width());
    QRect defaultRect = rect();
    QSize currentSize = size();
    LOG(currentSize.height())
    LOG(currentSize.width())
    int xP1 = 0;
    int yP1 = 0;
    int xP2 = 0;
    int yP2 = 0;
    defaultRect.getCoords(&xP1, &yP1, &xP2, &yP2);
    LOG(xP1)
    LOG(yP1)
    LOG(xP2)
    LOG(yP2)
    LOG(parent->width())
    LOG(defaultRect.height())
//            QRect newRect = QRect(xP1,yP1,parent->width(),defaultRect.height());
//            QRect newRect = QRect(0, 0, 0, defaultRect.height());
//            setFrameRect(newRect);
            resize(QSize(400, currentSize.height()));
            setFrameShape(QFrame::Box);
//            setGeometry(0, 0, parent->width(), defaultRect.height());
}

void FrameDemo::createPushButtonUtility()
{
    QPushButton *readButton = new QPushButton("Read", this);
    m_pLayout->addWidget(readButton, 0, 0, Qt::AlignCenter);
    QPushButton *writeButton = new QPushButton("Write", this);
    m_pLayout->addWidget(writeButton, 0, 1, Qt::AlignCenter);
    QPushButton *updateButton = new QPushButton("Update", this);
    m_pLayout->addWidget(updateButton, 0, 2, Qt::AlignCenter);
}
void FrameDemo::resizeEvent(QResizeEvent *event)
{
    LOG("resize")
}