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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* Inkscape::XML::CompositeNodeObserver - combine multiple observers
*//*
* Authors: see git history
*
* Copyright (C) 2018 Author
* Copyright 2005 MenTaLguY <mental@rydia.net>
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_INKSCAPE_XML_COMPOSITE_NODE_OBSERVER_H
#define SEEN_INKSCAPE_XML_COMPOSITE_NODE_OBSERVER_H
#include "inkgc/gc-managed.h"
#include "xml/node-observer.h"
#include "util/list-container.h"
namespace Inkscape {
namespace XML {
struct NodeEventVector;
/**
* @brief An observer that relays notifications to multiple other observers
*
* This special observer keeps a list of other observer objects and sends
* the notifications it receives to all of them. The implementation of the class
* allows an observer to remove itself from this object during a method call.
* For the documentation of callback methods, see NodeObserver.
*/
class CompositeNodeObserver : public NodeObserver, public GC::Managed<> {
public:
struct ObserverRecord : public GC::Managed<> {
explicit ObserverRecord(NodeObserver &o) : observer(o), marked(false) {}
NodeObserver &observer;
bool marked; //< if marked for removal
};
typedef Util::ListContainer<ObserverRecord> ObserverRecordList;
CompositeNodeObserver()
: _iterating(0), _active_marked(0), _pending_marked(0) {}
/**
* @brief Add an observer to the list
* @param observer The observer object to add
*/
void add(NodeObserver &observer);
/**
* @brief Remove an observer from the list
* @param observer The observer object to remove
*/
void remove(NodeObserver &observer);
/**
* @brief Add a set of callbacks with associated data
* @deprecated Use add() instead
*/
void addListener(NodeEventVector const &vector, void *data);
/**
* @brief Remove a set of callbacks by its associated data
* @deprecated Use remove() instead
*/
void removeListenerByData(void *data);
void notifyChildAdded(Node &node, Node &child, Node *prev) override;
void notifyChildRemoved(Node &node, Node &child, Node *prev) override;
void notifyChildOrderChanged(Node &node, Node &child,
Node *old_prev, Node *new_prev) override;
void notifyContentChanged(Node &node,
Util::ptr_shared old_content,
Util::ptr_shared new_content) override;
void notifyAttributeChanged(Node &node, GQuark name,
Util::ptr_shared old_value,
Util::ptr_shared new_value) override;
void notifyElementNameChanged(Node& node, GQuark old_name, GQuark new_name) override;
private:
unsigned _iterating;
ObserverRecordList _active;
unsigned _active_marked;
ObserverRecordList _pending;
unsigned _pending_marked;
void _startIteration() { ++_iterating; }
void _finishIteration();
};
} // namespace XML
} // namespace Inkscape
#endif
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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