QT设计器中的自定义小部件在框架中具有预先存在的布局

一个项目使用的自定义框架小部件实现了一种隐藏窗口小部件的"封面"（将其视为防止按按钮的安全封面）。这是必需的视觉设计。QT版本为4.6

#ifndef CQFRAME_H
#define CQFRAME_H
#include <QFrame>
#include <QtDesigner/QDesignerExportWidget>
//! [0] //! [1]
class CQFrame : public QFrame   
// our agreement about "custom" widgets is to start them with CQ
{
    Q_OBJECT
    Q_ENUMS(FrameColorStyle)
    Q_PROPERTY(FrameColorStyle colorStyle READ getColorStyle WRITE setColorStyle)
    Q_PROPERTY(bool border READ border WRITE setBorder)
//! [0]
private:
    bool curCover;
    QFrame *frameCover;
public:
    enum FrameColorStyle  {fcDark, fcLight, fcTransparent, fcSystemDefault, fcRed, fcGreen, fcBlue};
    CQFrame(QWidget *parent = 0);
    void setCoverPropertie();
    void setCover(bool state);
protected:
    void resizeEvent(QResizeEvent *event);
    FrameColorStyle m_colorStyle;
    QString pstylebord;
    bool m_border;
//! [2]
};
//! [1] //! [2]
#endif

我省略了与问题无关的Getters和Setter。这是实现：

void CQFrame::setCoverPropertie()
{
    QString str, strAlpha, gradient1, gradient2;
    strAlpha.setNum(200);
    gradient1 = "rgba("+str.setNum(cwDisableColor.red())+", "
                +str.setNum(cwDisableColor.green())
                +", "+str.setNum(cwDisableColor.blue())
                +" ," +strAlpha+ " )";
    gradient2 = "rgba("+str.setNum(cwLbColor.red())+", "
                +str.setNum(cwLbColor.green())+", "
                +str.setNum(cwLbColor.blue())+" ," +strAlpha+ " )";
    QStackedLayout *stackedLayout = new QStackedLayout(this);
    frameCover  = new QFrame(this);     
    frameCover->setGeometry(rect());
    frameCover->setStyleSheet("QFrame{border:5px solid  "+strLbColor+"; "
                                  "border-radius: 10px; background-color: "
                                  "qlineargradient(x1: 0, y1: 0, x2: 0, y2: 0.5, stop: 0 "
                                  +gradient1+" , stop: 1 "+gradient2+"); }");
    stackedLayout->addWidget(frameCover);
    stackedLayout->setStackingMode(QStackedLayout::StackAll);
}
void CQFrame::setCover(bool state)
{
    frameCover->setVisible(curCover = state);
}
void CQFrame::resizeEvent(QResizeEvent *event)
{
    if (curCover)
        frameCover->setGeometry(rect());
}

设计不是我的，我被要求修复它经历的奇怪的视觉故障。此"帧"在QT设计器中用作小部件之一。一段时间后，一切都大小了，这引起了问题"此代码有什么问题"。QT会在尝试添加布局的情况下发出警告：我想可能会引起问题，因为帧时帧必须只有一个布局？QT创建者生成的代码看起来像

void setupUi(CQFrame *CQWnd1T2SeparateONForm)
    {
        if (CQWnd1T2SeparateONForm->objectName().isEmpty())
            CQWnd1T2SeparateONForm->setObjectName(QString::fromUtf8("CQWnd1T2SeparateONForm"));
        CQWnd1T2SeparateONForm->resize(735, 241);
        QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        sizePolicy.setHorizontalStretch(0);
        sizePolicy.setVerticalStretch(0);
        sizePolicy.setHeightForWidth(CQWnd1T2SeparateONForm->sizePolicy().hasHeightForWidth());
        CQWnd1T2SeparateONForm->setSizePolicy(sizePolicy);
        gridLayout = new QGridLayout(CQWnd1T2SeparateONForm); // warning here
}

标准QMainWindow始终拥有自己的"特殊"布局存在类似的问题，QT Creator可以通过在布局中添加中央小部件来自动求解，并将其他所有内容添加到该小部件中。我不知道这是如何使用QT Creator插件的自定义小部件模拟相同行为的方法。或可以使用CQFrame的替代设计。CQFrame在十二个项目中重复使用，在大约30多个面板中，因此为它们重复使用代码是一个严格的要求。当前插件非常基本：

class QDESIGNER_WIDGET_EXPORT CQFramePlugin : public QObject,
                             public QDesignerCustomWidgetInterface
{
    Q_OBJECT
    Q_INTERFACES(QDesignerCustomWidgetInterface)
public:
    CQFramePlugin(QObject *parent = 0);
    bool isContainer() const;
    bool isInitialized() const;
    QIcon icon() const;
    QString domXml() const;
    QString group() const;
    QString includeFile() const;
    QString name() const;
    QString toolTip() const;
    QString whatsThis() const;
    QWidget *createWidget(QWidget *parent);
    void initialize(QDesignerFormEditorInterface *core);
private:
    bool initialized;
};

.cpp：

#include "cqframe.h"
#include "cqframeplugin.h"
#include <QtPlugin>
CQFramePlugin::CQFramePlugin(QObject *parent)
    : QObject(parent)
{
    initialized = false;
}
void CQFramePlugin::initialize(QDesignerFormEditorInterface * /* core */)
{
    if (initialized)
        return;
    initialized = true;
}
bool CQFramePlugin::isInitialized() const
{
    return initialized;
}
QWidget *CQFramePlugin::createWidget(QWidget *parent)
{
    return new CQFrame(parent);
}
QString CQFramePlugin::name() const
{
    return "CQFrame";
}
QString CQFramePlugin::group() const
{
    return "CustomWidgets";
}
QIcon CQFramePlugin::icon() const
{
    return QIcon(":/Resources/frame_icon.png");
}
QString CQFramePlugin::toolTip() const
{
    return "";
}
QString CQFramePlugin::whatsThis() const
{
    return "";
}
bool CQFramePlugin::isContainer() const
{
    return true;
}
QString CQFramePlugin::domXml() const
{
    return "<ui language="c++">n"
           " <widget class="CQFrame" name="Frame">n"
           "  <property name="geometry">n"
            "   <rect>n"
            "    <x>0</x>n"
            "    <y>0</y>n"
            "    <width>120</width>n"
            "    <height>80</height>n"
            "   </rect>n"
            "  </property>n"
           " </widget>n"
           "</ui>";
}
QString CQFramePlugin::includeFile() const
{
    return "cqframe.h";
}