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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/* Copyright 2008,2009,2012 Rolf Eike Beer <kde@opensource.sf-tec.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License or (at your option) version 3 or any later version
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* accepted by the membership of KDE e.V. (or its successor approved
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* by the membership of KDE e.V.), which shall act as a proxy
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* defined in Section 14 of version 3 of the license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef KGPGEXPANDABLENODE_H
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#define KGPGEXPANDABLENODE_H
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#include "KGpgNode.h"
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class KGpgSubkeyNode;
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class KGpgRefNode;
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/**
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* @brief The abstract base class for all classes that may have child objects
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*
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* Every class that represents something in the keyring that may have
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* child objects inherits from this class. That does not mean that every
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* child object always has children, but every child \em may have children.
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*/
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class KGpgExpandableNode : public KGpgNode
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{
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Q_OBJECT
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friend class KGpgRefNode;
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friend class KGpgSubkeyNode;
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protected:
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KGpgNode::List children;
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/**
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* reimplemented in every base class to read in the child data
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*
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* This allows the child objects to delay the loading of the
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* child objects until they are really needed to avoid time
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* consuming operations for data never used.
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*/
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virtual void readChildren() = 0;
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explicit KGpgExpandableNode(KGpgExpandableNode *parent = NULL);
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public:
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virtual ~KGpgExpandableNode();
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/**
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* check if there are any child nodes
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*
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* The default implementation returns true if any child nodes were loaded.
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* This may be reimplemented by child classes so they can indicate that
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* there are child nodes before actually loading them.
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*
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* This method indicates if there are children if this node is expanded.
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* In contrast wasExpanded() will only return true if the child nodes
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* are actually present in memory.
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*/
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virtual bool hasChildren() const;
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/**
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* check if there are any child nodes present in memory
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*
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* Returns true if any child nodes were loaded.
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*
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* This method indicates if the children of this node are already loaded
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* into memory. In contrast hasChildren() may return true even if the child
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* objects are not present in memory.
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*/
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virtual bool wasExpanded() const;
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virtual int getChildCount();
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virtual const KGpgNode::List &getChildren() const;
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virtual KGpgNode *getChild(const int index) const;
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virtual int getChildIndex(KGpgNode *node) const;
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virtual void deleteChild(KGpgNode *child);
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};
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#endif /* KGPGEXPANDABLENODE_H */
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