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/*
This file is part of Akregator.
Copyright (C) 2004 Stanislav Karchebny <Stanislav.Karchebny@kdemail.net>
2004-2005 Frank Osterfeld <frank.osterfeld@kdemail.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
As a special exception, permission is given to link this program
with any edition of Qt, and distribute the resulting executable,
without including the source code for Qt in the source distribution.
*/
#ifndef AKREGATOR_FOLDER_H
#define AKREGATOR_FOLDER_H
#include "treenode.h"
class QDomDocument;
class QDomElement;
class QStringList;
template <class T> class QValueList;
namespace Akregator
{
class Article;
class FetchQueue;
class TreeNodeVisitor;
/** Represents a folder (containing feeds and/or other folders)
*/
class Folder : public TreeNode
{
Q_OBJECT
public:
/** creates a feed group parsed from a XML dom element.
Child nodes are not inserted or parsed.
@param e the element representing the feed group
@return a freshly created feed group */
static Folder* fromOPML(QDomElement e);
/** Creates a new folder with a given title
@param title The title of the feed group
*/
Folder(const QString& title = QString::null);
virtual ~Folder();
virtual bool accept(TreeNodeVisitor* visitor);
/** returns recursively concatenated articles of children
@return an article sequence containing articles of children */
virtual QValueList<Article> articles(const QString& tag=QString::null);
/** returns a list of all tags occurring in the subtree of this folder */
virtual QStringList tags() const;
/** returns the number of unread articles in all children
@return number of unread articles */
virtual int unread() const;
/** returns the number of articles in all children
@return number of articles */
virtual int totalCount() const;
/** Helps the rest of the app to decide if node should be handled as group or not. Use only where necessary, use polymorphism where possible. */
virtual bool isGroup() const { return true; }
/** converts the feed group into OPML format for save and export and appends it to node @c parent in document @document.
Children are processed and appended recursively.
@param parent The parent element
@param document The DOM document
@return The newly created element representing this feed group */
virtual QDomElement toOPML( QDomElement parent, QDomDocument document ) const;
/** returns the (direct) children of this node.
@return a list of pointers to the child nodes
*/
virtual QValueList<TreeNode*> children() const;
/** inserts @c node as child after child node @c after.
if @c after is not a child of this group, @c node will be inserted as first child
@param node the tree node to insert
@param after the node after which @c node will be inserted */
virtual void insertChild(TreeNode* node, TreeNode* after);
/** inserts @c node as first child
@param node the tree node to insert */
virtual void prependChild(TreeNode* node);
/** inserts @c node as last child
@param node the tree node to insert */
virtual void appendChild(TreeNode* node);
/** remove @c node from children. Note that @c node will not be deleted
@param node the child node to remove */
virtual void removeChild(TreeNode* node);
/** returns the first child of the group, 0 if none exist */
virtual TreeNode* firstChild();
/** returns the last child of the group, 0 if none exist */
virtual TreeNode* lastChild();
/** returns whether the feed group is opened or not..
Use only in \ref FolderItem. */
virtual bool isOpen() const;
/** open/close the feed group (display it as expanded/collapsed in the tree view). Use only in \ref FolderItem. */
virtual void setOpen(bool open);
signals:
/** emitted when a child was added */
void signalChildAdded(TreeNode*);
/** emitted when a child was removed */
void signalChildRemoved(Folder*, TreeNode*);
public slots:
/** Delete expired articles recursively. */
virtual void slotDeleteExpiredArticles();
/** Mark articles of children recursively as read. */
virtual void slotMarkAllArticlesAsRead();
/** Called when a child was modified.
@param node the child that was changed
*/
virtual void slotChildChanged(TreeNode* node);
/** Called when a child was destroyed.
@param node the child that was destroyed
*/
virtual void slotChildDestroyed(TreeNode* node);
/** enqueues children recursively for fetching
@param queue a fetch queue
@param internvalFetchesOnly */
virtual void slotAddToFetchQueue(FetchQueue* queue, bool intervalFetchesOnly=false);
/** returns the next node in the tree.
Calling next() unless it returns 0 iterates through the tree in pre-order
*/
virtual TreeNode* next();
protected:
/** inserts @c node as child on position @c index
@param index the position where to insert
@param node the tree node to insert */
virtual void insertChild(uint index, TreeNode* node);
virtual void doArticleNotification();
private:
void connectToNode(TreeNode* child);
void disconnectFromNode(TreeNode* child);
virtual void updateUnreadCount();
class FolderPrivate;
FolderPrivate* d;
};
}
#endif // AKREGATOR_FOLDER_H
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