composite-node-observer.cpp revision d6e289e892dd8c5f7c69425fe2722eb3fae4f48c
/*
* Inkscape::XML::CompositeNodeObserver - combine multiple observers
*
* Copyright 2005 MenTaLguY <mental@rydia.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.
*
* See the file COPYING for details.
*
*/
#include <cstring>
#include <glib.h>
#include "util/find-if-before.h"
#include "xml/composite-node-observer.h"
#include "xml/node-event-vector.h"
#include "debug/event-tracker.h"
#include "debug/simple-event.h"
namespace Inkscape {
namespace XML {
void CompositeNodeObserver::notifyChildAdded(Node &node, Node &child, Node *prev)
{
_startIteration();
for ( ObserverRecordList::iterator iter=_active.begin() ;
iter != _active.end() ; ++iter )
{
if (!iter->marked) {
iter->observer.notifyChildAdded(node, child, prev);
}
}
_finishIteration();
}
void CompositeNodeObserver::notifyChildRemoved(Node &node, Node &child,
Node *prev)
{
_startIteration();
for ( ObserverRecordList::iterator iter=_active.begin() ;
iter != _active.end() ; ++iter )
{
if (!iter->marked) {
iter->observer.notifyChildRemoved(node, child, prev);
}
}
_finishIteration();
}
void CompositeNodeObserver::notifyChildOrderChanged(Node &node, Node &child,
Node *old_prev,
Node *new_prev)
{
_startIteration();
for ( ObserverRecordList::iterator iter=_active.begin() ;
iter != _active.end() ; ++iter )
{
if (!iter->marked) {
iter->observer.notifyChildOrderChanged(node, child, old_prev, new_prev);
}
}
_finishIteration();
}
void CompositeNodeObserver::notifyContentChanged(
Node &node,
Util::ptr_shared<char> old_content, Util::ptr_shared<char> new_content
) {
_startIteration();
for ( ObserverRecordList::iterator iter=_active.begin() ;
iter != _active.end() ; ++iter )
{
if (!iter->marked) {
iter->observer.notifyContentChanged(node, old_content, new_content);
}
}
_finishIteration();
}
void CompositeNodeObserver::notifyAttributeChanged(
Node &node, GQuark name,
Util::ptr_shared<char> old_value, Util::ptr_shared<char> new_value
) {
_startIteration();
for ( ObserverRecordList::iterator iter=_active.begin() ;
iter != _active.end() ; ++iter )
{
if (!iter->marked) {
iter->observer.notifyAttributeChanged(node, name, old_value, new_value);
}
}
_finishIteration();
}
void CompositeNodeObserver::add(NodeObserver &observer) {
if (_iterating) {
_pending.push_back(ObserverRecord(observer));
} else {
_active.push_back(ObserverRecord(observer));
}
}
namespace {
class VectorNodeObserver : public NodeObserver, public GC::Managed<> {
public:
VectorNodeObserver(NodeEventVector const &v, void *d)
: vector(v), data(d) {}
NodeEventVector const &vector;
void * const data;
void notifyChildAdded(Node &node, Node &child, Node *prev) {
if (vector.child_added) {
vector.child_added(&node, &child, prev, data);
}
}
void notifyChildRemoved(Node &node, Node &child, Node *prev) {
if (vector.child_removed) {
vector.child_removed(&node, &child, prev, data);
}
}
void notifyChildOrderChanged(Node &node, Node &child, Node *old_prev, Node *new_prev) {
if (vector.order_changed) {
vector.order_changed(&node, &child, old_prev, new_prev, data);
}
}
void notifyContentChanged(Node &node, Util::ptr_shared<char> old_content, Util::ptr_shared<char> new_content) {
if (vector.content_changed) {
vector.content_changed(&node, old_content, new_content, data);
}
}
void notifyAttributeChanged(Node &node, GQuark name, Util::ptr_shared<char> old_value, Util::ptr_shared<char> new_value) {
if (vector.attr_changed) {
vector.attr_changed(&node, g_quark_to_string(name), old_value, new_value, false, data);
}
}
};
}
void CompositeNodeObserver::addListener(NodeEventVector const &vector,
void *data)
{
Debug::EventTracker<Debug::SimpleEvent<Debug::Event::XML> > tracker("add-listener");
add(*(new VectorNodeObserver(vector, data)));
}
namespace {
using std::find_if;
using Algorithms::find_if_before;
typedef CompositeNodeObserver::ObserverRecord ObserverRecord;
typedef CompositeNodeObserver::ObserverRecordList ObserverRecordList;
template <typename ObserverPredicate>
struct unmarked_record_satisfying {
ObserverPredicate predicate;
unmarked_record_satisfying(ObserverPredicate p) : predicate(p) {}
bool operator()(ObserverRecord const &record) {
return !record.marked && predicate(record.observer);
}
};
template <typename Predicate>
bool mark_one(ObserverRecordList &observers, unsigned &/*marked_count*/,
Predicate p)
{
ObserverRecordList::iterator found=std::find_if(
observers.begin(), observers.end(),
unmarked_record_satisfying<Predicate>(p)
);
if ( found != observers.end() ) {
found->marked = true;
return true;
} else {
return false;
}
}
template <typename Predicate>
bool remove_one(ObserverRecordList &observers, unsigned &/*marked_count*/,
Predicate p)
{
if (observers.empty()) {
return false;
}
if (unmarked_record_satisfying<Predicate>(p)(observers.front())) {
observers.pop_front();
return true;
}
ObserverRecordList::iterator found=find_if_before(
observers.begin(), observers.end(),
unmarked_record_satisfying<Predicate>(p)
);
if ( found != observers.end() ) {
observers.erase_after(found);
return true;
} else {
return false;
}
}
bool is_marked(ObserverRecord const &record) { return record.marked; }
void remove_all_marked(ObserverRecordList &observers, unsigned &marked_count)
{
ObserverRecordList::iterator iter;
g_assert( !observers.empty() || !marked_count );
while ( marked_count && observers.front().marked ) {
observers.pop_front();
--marked_count;
}
iter = observers.begin();
while (marked_count) {
iter = find_if_before(iter, observers.end(), is_marked);
observers.erase_after(iter);
--marked_count;
}
}
}
void CompositeNodeObserver::_finishIteration() {
if (!--_iterating) {
remove_all_marked(_active, _active_marked);
remove_all_marked(_pending, _pending_marked);
_active.insert(_active.end(), _pending.begin(), _pending.end());
_pending.clear();
}
}
namespace {
struct eql_observer {
NodeObserver const &observer;
eql_observer(NodeObserver const &o) : observer(o) {}
bool operator()(NodeObserver const &other) {
return &observer == &other;
}
};
}
void CompositeNodeObserver::remove(NodeObserver &observer) {
eql_observer p(observer);
if (_iterating) {
mark_one(_active, _active_marked, p) ||
mark_one(_pending, _pending_marked, p);
} else {
remove_one(_active, _active_marked, p) ||
remove_one(_pending, _pending_marked, p);
}
}
namespace {
struct vector_data_matches {
void * const data;
vector_data_matches(void *d) : data(d) {}
bool operator()(NodeObserver const &observer) {
VectorNodeObserver const *vo=dynamic_cast<VectorNodeObserver const *>(&observer);
bool OK = false;
if (vo) {
if (vo && vo->data == data) {
OK = true;
}
}
return OK;
}
};
}
void CompositeNodeObserver::removeListenerByData(void *data) {
Debug::EventTracker<Debug::SimpleEvent<Debug::Event::XML> > tracker("remove-listener-by-data");
vector_data_matches p(data);
if (_iterating) {
mark_one(_active, _active_marked, p) ||
mark_one(_pending, _pending_marked, p);
} else {
remove_one(_active, _active_marked, p) ||
remove_one(_pending, _pending_marked, p);
}
}
}
}
/*
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 :