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-rw-r--r-- | src/xml/composite-node-observer.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/xml/composite-node-observer.h b/src/xml/composite-node-observer.h new file mode 100644 index 0000000..7a8c7d5 --- /dev/null +++ b/src/xml/composite-node-observer.h @@ -0,0 +1,110 @@ +// 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-alloc.h" +#include "inkgc/gc-managed.h" +#include "xml/node-observer.h" +#include <list> + +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 std::list<ObserverRecord, Inkscape::GC::Alloc<ObserverRecord, Inkscape::GC::MANUAL>> 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 : |