The Property Browser 中的manager,foctory的职责

参考：
开始有点迷茫，感觉它们的关系有点象工人与工头，manager具体来实现，但需foctory来调配.
此比喻可能有点不妥当，欢迎留言指更

class FilePathManager : public QtAbstractPropertyManager
{
    Q_OBJECT

public:
    FilePathManager(QObject *parent = 0) : QtAbstractPropertyManager(parent){ }

    QString value(const QtProperty *property) const;
    QString filter(const QtProperty *property) const;

public slots:
    void setValue(QtProperty *property, const QString &val);
    void setFilter(QtProperty *property, const QString &fil);
signals:
    void valueChanged(QtProperty *property, const QString &val);
    void filterChanged(QtProperty *property, const QString &fil);
protected:
    virtual QString valueText(const QtProperty *property) const { return value(property); }
    virtual void initializeProperty(QtProperty *property)  { theValues[property] = Data(); }
    virtual void uninitializeProperty(QtProperty *property) { theValues.remove(property); }
private:

    struct Data
    {
        QString value;
        QString filter;
    };

    mutable QMap theValues;
};

class DecoratedDoublePropertyManager : public QtDoublePropertyManager
{
    Q_OBJECT
public:
    DecoratedDoublePropertyManager(QObject *parent = 0);
    ~DecoratedDoublePropertyManager();

    QString prefix(const QtProperty *property) const;
    QString suffix(const QtProperty *property) const;
public Q_SLOTS:
    void setPrefix(QtProperty *property, const QString &prefix);
    void setSuffix(QtProperty *property, const QString &suffix);
Q_SIGNALS:
    void prefixChanged(QtProperty *property, const QString &prefix);
    void suffixChanged(QtProperty *property, const QString &suffix);
protected:
    QString valueText(const QtProperty *property) const;
    virtual void initializeProperty(QtProperty *property);
    virtual void uninitializeProperty(QtProperty *property);
private:
    struct Data {
        QString prefix;
        QString suffix;
    };
    QMap propertyToData;
};

/*********************************************/
class DecoratedDoubleSpinBoxFactory : public QtAbstractEditorFactory
{
    Q_OBJECT
public:
    DecoratedDoubleSpinBoxFactory(QObject *parent = 0);
    ~DecoratedDoubleSpinBoxFactory();
protected:
    void connectPropertyManager(DecoratedDoublePropertyManager *manager);
    QWidget *createEditor(DecoratedDoublePropertyManager *manager, QtProperty *property, QWidget *parent);
    void disconnectPropertyManager(DecoratedDoublePropertyManager *manager);
private slots:

    void slotPrefixChanged(QtProperty *property, const QString &prefix);
    void slotSuffixChanged(QtProperty *property, const QString &prefix);
    void slotEditorDestroyed(QObject *object);
private:
    /* We delegate responsibilities for QtDoublePropertyManager, which is a base class
       of DecoratedDoublePropertyManager to appropriate QtDoubleSpinBoxFactory */
    QtDoubleSpinBoxFactory *originalFactory;
    QMap > createdEditors;
    QMap editorToProperty;
};

class FileEditFactory : public QtAbstractEditorFactory
{
    Q_OBJECT

public:
    FileEditFactory(QObject *parent = 0)
        : QtAbstractEditorFactory(parent)
            { }
    virtual ~FileEditFactory();
protected:
    virtual void connectPropertyManager(FilePathManager *manager);
    virtual QWidget *createEditor(FilePathManager *manager, QtProperty *property,
                QWidget *parent);
    virtual void disconnectPropertyManager(FilePathManager *manager);
private slots:
    void slotPropertyChanged(QtProperty *property, const QString &value);
    void slotFilterChanged(QtProperty *property, const QString &filter);
    void slotSetValue(const QString &value);
    void slotEditorDestroyed(QObject *object);
private:
    QMap > theCreatedEditors;
    QMap theEditorToProperty;
};