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+/***************************************************************************
+ *   Copyright (C) 2004 by Alexander Dymo                                  *
+ *   cloudtemple@mskat.net                                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU Library General Public License as       *
+ *   published by the Free Software Foundation; either version 2 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this program; if not, write to the                 *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifndef PROPERTYLIST_H
+#define PROPERTYLIST_H
+
+#include <qobject.h>
+#include <qmap.h>
+#include <qptrlist.h>
+#include <qvaluelist.h>
+#include <qpair.h>
+
+namespace PropertyLib{
+
+class Property;
+class MultiProperty;
+
+/** @file propertylist.h
+@short Contains @ref PropertyLib::PropertyList class.
+*/
+
+/**
+@short The list of properties.
+
+Every object in a program should operate with properties through
+this list in order to:
+- be informed about property changes
+- allow property lists intersections
+- display properties in the property editor widget (see @ref PropertyLib::PropertyEditor).
+.
+
+PropertyList owns properties and deletes them itself. For a list that does not own
+it's properties, look at @ref PropertyLib::PropertyBuffer class.
+
+PropertyList is also capable of grouping properties.
+You can have unsorted list of groups of properties or a plain
+alphabetically sorted list of properties or both at the same time.
+*/
+class PropertyList: public QObject
+{
+    Q_OBJECT
+
+public:
+    class Iterator {
+    public:
+        void operator ++();
+        void operator ++(int);
+        
+        MultiProperty *operator *();
+        
+        bool operator != (Iterator it);
+        
+        QString key();
+        MultiProperty *data();
+        
+    private:
+        Iterator(PropertyList *list);
+        Iterator(PropertyList *list, bool end);
+        
+        void next();
+        QMap<QString, MultiProperty*>::iterator current;
+        
+        PropertyList *m_list;
+        friend class PropertyList;
+    };
+    
+    typedef Iterator iterator;
+    
+    PropertyList();
+    virtual ~PropertyList();
+
+    /**Accesses a property by it's name. All property modifications are allowed
+    trough this method. For example, to set a value of a property, use:
+    /code
+    PropertyList list;
+    ...
+    list["My Property"]->setValue("My Value");
+    /endcode
+    @return @ref MultiProperty with given name.*/
+    virtual MultiProperty *operator[](const QString &name);
+    /**Accesses a property by it's name. All property modifications are allowed
+    trough this method. For example, to set a value of a property
+    */
+    MultiProperty *property( const QString &name );
+
+    /**Adds the property to the list to the "common" group.*/
+    virtual void addProperty(Property *property);
+    /**Adds the property to the list in group.*/
+    virtual void addProperty(const QString &group, Property *property);
+    /**Removes property from the list. Emits aboutToDeleteProperty before removing.*/
+    virtual void removeProperty(Property *property);
+    /**Removes property with the given name from the list.
+    Emits @ref aboutToDeleteProperty before removing.*/
+    virtual void removeProperty(const QString &name);
+    
+    /**@return the list of grouped properties.*/
+    virtual const QValueList<QPair<QString, QValueList<QString> > >& propertiesOfGroup() const;
+    /**@return the map: property - group name.*/
+    virtual const QMap<MultiProperty*, QString>& groupOfProperty() const;
+    
+    /**Clears the list of properties.*/
+    virtual void clear();
+    /**Returns true if the list of properties contains property with given name.*/
+    virtual bool contains(const QString &name);
+    
+    /**The list of properties with given name.*/
+    QPtrList<Property> properties(const QString &name);
+    
+    Iterator begin();
+    Iterator end();
+
+signals:
+    /**Emitted when the value of the property is changed.*/
+    void propertyValueChanged(Property* property);
+    /**Emitted when property is about to be deleted.*/
+    void aboutToDeleteProperty(Property* property);
+    
+protected:
+    /**Constructs a list which owns or does not own it's properties.*/
+    PropertyList(bool propertyOwner);
+
+    /**Adds property to a group.*/
+    void addToGroup(const QString &group, MultiProperty *property);
+    /**Removes property from a group.*/
+    void removeFromGroup(MultiProperty *property);
+        
+private:
+    //sorted list of properties in form name: property
+    QMap<QString, MultiProperty*> m_list;
+    
+    //groups of properties:
+    // list of group name: (list of property names)
+    QValueList<QPair<QString, QValueList<QString> > > m_propertiesOfGroup;
+    // map of property: group
+    QMap<MultiProperty*, QString> m_groupOfProperty;
+
+    //indicates that this list will delete properties after removeProperty()
+    //and also in destructor
+    bool m_propertyOwner;
+    
+friend class MultiProperty;
+friend class PropertyBuffer;
+friend class Iterator;
+};
+
+
+/**
+@short The list of properties which does not own them.
+
+This class acts as @ref PropertyLib::PropertyList but it does not delete properties
+in destructor (i.e. it does not own properties).
+This class should be used to store results of property intersections.
+
+Example:
+/code
+PropertyList *list = new PropertyList();
+PropertyList *list2 = new PropertyList();
+PropertyList *list3 = new PropertyList();
+...
+PropertyBuffer *buf = new PropertyBuffer(list);
+buf->intersect(list2);
+buf->intersect(list3);
+...
+/endcode
+*/
+class PropertyBuffer: public PropertyList{
+    Q_OBJECT
+public:
+    /**Constructs a buffer from given property list.*/
+    PropertyBuffer(PropertyList *list);
+    /**Constructs an empty property buffer.*/
+    PropertyBuffer();
+
+    /**Intersects with other @ref PropertyLib::PropertyList.*/
+    virtual void intersect(const PropertyList *list);
+
+protected slots:
+    void intersectedValueChanged(Property *property);
+    
+};
+
+}
+
+#endif