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/**
* Aggregates undo stack observers for convenient management and triggering in SPDocument
*
* Heavily inspired by Inkscape::XML::CompositeNodeObserver.
*
* Authors:
* David Yip <yipdw@rose-hulman.edu>
*
* Copyright (c) 2005 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <algorithm>
#include "composite-undo-stack-observer.h"
#include "xml/event.h"
namespace Inkscape {
CompositeUndoStackObserver::CompositeUndoStackObserver() : _iterating(0) { }
CompositeUndoStackObserver::~CompositeUndoStackObserver() { }
void
CompositeUndoStackObserver::add(UndoStackObserver& observer)
{
if (!this->_iterating) {
this->_active.push_back(UndoStackObserverRecord(observer));
} else {
this->_pending.push_back(UndoStackObserverRecord(observer));
}
}
void
CompositeUndoStackObserver::remove(UndoStackObserver& observer)
{
if (!this->_iterating) {
// logical-or operator short-circuits
this->_remove_one(this->_active, observer) || this->_remove_one(this->_pending, observer);
} else {
this->_mark_one(this->_active, observer) || this->_mark_one(this->_pending, observer);
}
}
void
CompositeUndoStackObserver::notifyUndoEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueUndo(log);
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyRedoEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueRedo(log);
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyUndoCommitEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueUndoCommit(log);
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyClearUndoEvent()
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueClearUndo();
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyClearRedoEvent()
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueClearRedo();
}
}
this->_unlock();
}
bool
CompositeUndoStackObserver::_remove_one(UndoObserverRecordList& list, UndoStackObserver& o)
{
UndoStackObserverRecord eq_comp(o);
UndoObserverRecordList::iterator i = std::find_if(list.begin(), list.end(), std::bind1st(std::equal_to< UndoStackObserverRecord >(), eq_comp));
if (i != list.end()) {
list.erase(i);
return true;
} else {
return false;
}
}
bool
CompositeUndoStackObserver::_mark_one(UndoObserverRecordList& list, UndoStackObserver& o)
{
UndoStackObserverRecord eq_comp(o);
UndoObserverRecordList::iterator i = std::find_if(list.begin(), list.end(), std::bind1st(std::equal_to< UndoStackObserverRecord >(), eq_comp));
if (i != list.end()) {
(*i).to_remove = true;
return true;
} else {
return false;
}
}
void
CompositeUndoStackObserver::_unlock()
{
if (!--this->_iterating) {
// Remove marked observers
UndoObserverRecordList::iterator i = this->_active.begin();
for(; i != this->_active.begin(); i++) {
if (i->to_remove) {
this->_active.erase(i);
}
}
i = this->_pending.begin();
for(; i != this->_pending.begin(); i++) {
if (i->to_remove) {
this->_active.erase(i);
}
}
// Merge pending and active
this->_active.insert(this->_active.end(), this->_pending.begin(), this->_pending.end());
this->_pending.clear();
}
}
}
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