b9126419ae
git-svn-id: svn://localhost/ardour2/branches/3.0@7686 d708f5d6-7413-0410-9779-e7cbd77b26cf
345 lines
9.8 KiB
C++
345 lines
9.8 KiB
C++
/*
|
|
Copyright (C) 2010 Paul Davis
|
|
|
|
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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
#ifndef __libpbd_sequence_property_h__
|
|
#define __libpbd_sequence_property_h__
|
|
|
|
#include <iostream>
|
|
|
|
#include <set>
|
|
#include <list>
|
|
|
|
#include <boost/function.hpp>
|
|
|
|
#include "pbd/convert.h"
|
|
#include "pbd/id.h"
|
|
#include "pbd/property_basics.h"
|
|
#include "pbd/property_list.h"
|
|
|
|
namespace PBD {
|
|
|
|
/** A base class for properties whose state is a container of other
|
|
* things. Its behaviour is `specialised' for this purpose in that
|
|
* it holds state changes as additions to and removals from the
|
|
* container, which is more efficient than storing entire state after
|
|
* any change.
|
|
*/
|
|
template<typename Container>
|
|
class SequenceProperty : public PropertyBase
|
|
{
|
|
public:
|
|
typedef std::set<typename Container::value_type> ChangeContainer;
|
|
|
|
/** A record of changes made */
|
|
struct ChangeRecord {
|
|
|
|
void add (typename Container::value_type const & r) {
|
|
typename ChangeContainer::iterator i = removed.find (r);
|
|
if (i != removed.end()) {
|
|
/* we're adding, and this thing has already been marked as removed, so
|
|
just remove it from the removed list
|
|
*/
|
|
removed.erase (r);
|
|
} else {
|
|
added.insert (r);
|
|
}
|
|
}
|
|
|
|
void remove (typename Container::value_type const & r) {
|
|
typename ChangeContainer::iterator i = added.find (r);
|
|
if (i != added.end()) {
|
|
/* we're removing, and this thing has already been marked as added, so
|
|
just remove it from the added list
|
|
*/
|
|
added.erase (i);
|
|
} else {
|
|
removed.insert (r);
|
|
}
|
|
}
|
|
|
|
ChangeContainer added;
|
|
ChangeContainer removed;
|
|
};
|
|
|
|
SequenceProperty (PropertyID id, const boost::function<void(const ChangeRecord&)>& update)
|
|
: PropertyBase (id), _update_callback (update) {}
|
|
|
|
virtual typename Container::value_type lookup_id (const PBD::ID&) const = 0;
|
|
|
|
void invert () {
|
|
_changes.removed.swap (_changes.added);
|
|
}
|
|
|
|
void get_changes_as_xml (XMLNode* history_node) const {
|
|
|
|
XMLNode* child = new XMLNode (PBD::capitalize (property_name()));
|
|
history_node->add_child_nocopy (*child);
|
|
|
|
/* record the change described in our change member */
|
|
|
|
if (!_changes.added.empty()) {
|
|
for (typename ChangeContainer::iterator i = _changes.added.begin(); i != _changes.added.end(); ++i) {
|
|
XMLNode* add_node = new XMLNode ("Add");
|
|
child->add_child_nocopy (*add_node);
|
|
add_node->add_property ("id", (*i)->id().to_s());
|
|
}
|
|
}
|
|
if (!_changes.removed.empty()) {
|
|
for (typename ChangeContainer::iterator i = _changes.removed.begin(); i != _changes.removed.end(); ++i) {
|
|
XMLNode* remove_node = new XMLNode ("Remove");
|
|
child->add_child_nocopy (*remove_node);
|
|
remove_node->add_property ("id", (*i)->id().to_s());
|
|
}
|
|
}
|
|
}
|
|
|
|
bool set_value (XMLNode const &) {
|
|
/* XXX: not used, but probably should be */
|
|
assert (false);
|
|
return false;
|
|
}
|
|
|
|
void get_value (XMLNode & node) const {
|
|
for (typename Container::const_iterator i = _val.begin(); i != _val.end(); ++i) {
|
|
node.add_child_nocopy ((*i)->get_state ());
|
|
}
|
|
}
|
|
|
|
bool changed () const {
|
|
return !_changes.added.empty() || !_changes.removed.empty();
|
|
}
|
|
|
|
void clear_changes () {
|
|
_changes.added.clear ();
|
|
_changes.removed.clear ();
|
|
}
|
|
|
|
void apply_changes (PropertyBase const * p) {
|
|
const ChangeRecord& change (dynamic_cast<const SequenceProperty*> (p)->changes ());
|
|
update (change);
|
|
}
|
|
|
|
/** Given a record of changes to this property, pass it to a callback that will
|
|
* update the property in some appropriate way.
|
|
*
|
|
* This exists because simply using std::sequence methods to add/remove items
|
|
* from the property is far too simplistic - the semantics of add/remove may
|
|
* be much more complex than that.
|
|
*/
|
|
void update (const ChangeRecord& cr) {
|
|
_update_callback (cr);
|
|
}
|
|
|
|
void get_changes_as_properties (PBD::PropertyList& changes, Command* cmd) const {
|
|
if (!changed ()) {
|
|
return;
|
|
}
|
|
|
|
/* Create a property with just the changes and not the actual values */
|
|
SequenceProperty<Container>* a = create ();
|
|
a->_changes = _changes;
|
|
changes.add (a);
|
|
|
|
if (cmd) {
|
|
/* whenever one of the items emits DropReferences, make sure
|
|
that the Destructible we've been told to notify hears about
|
|
it. the Destructible is likely to be the Command being built
|
|
with this diff().
|
|
*/
|
|
|
|
for (typename ChangeContainer::iterator i = a->changes().added.begin(); i != a->changes().added.end(); ++i) {
|
|
(*i)->DropReferences.connect_same_thread (*cmd, boost::bind (&Destructible::drop_references, cmd));
|
|
}
|
|
}
|
|
}
|
|
|
|
SequenceProperty<Container>* clone_from_xml (XMLNode const & node) const {
|
|
|
|
XMLNodeList const children = node.children ();
|
|
|
|
/* find the node for this property name */
|
|
|
|
std::string const c = capitalize (property_name ());
|
|
XMLNodeList::const_iterator i = children.begin();
|
|
while (i != children.end() && (*i)->name() != c) {
|
|
++i;
|
|
}
|
|
|
|
if (i == children.end()) {
|
|
return 0;
|
|
}
|
|
|
|
/* create a property with the changes */
|
|
|
|
SequenceProperty<Container>* p = create ();
|
|
|
|
XMLNodeList const & grandchildren = (*i)->children ();
|
|
for (XMLNodeList::const_iterator j = grandchildren.begin(); j != grandchildren.end(); ++j) {
|
|
XMLProperty const * prop = (*j)->property ("id");
|
|
assert (prop);
|
|
PBD::ID id (prop->value ());
|
|
typename Container::value_type v = lookup_id (id);
|
|
assert (v);
|
|
if ((*j)->name() == "Add") {
|
|
p->_changes.added.insert (v);
|
|
} else if ((*j)->name() == "Remove") {
|
|
p->_changes.removed.insert (v);
|
|
}
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
void clear_owned_changes () {
|
|
for (typename Container::iterator i = begin(); i != end(); ++i) {
|
|
(*i)->clear_changes ();
|
|
}
|
|
}
|
|
|
|
void rdiff (std::vector<StatefulDiffCommand*>& cmds) const {
|
|
for (typename Container::const_iterator i = begin(); i != end(); ++i) {
|
|
if ((*i)->changed ()) {
|
|
StatefulDiffCommand* sdc = new StatefulDiffCommand (*i);
|
|
cmds.push_back (sdc);
|
|
}
|
|
}
|
|
}
|
|
|
|
Container rlist() { return _val; }
|
|
|
|
/* Wrap salient methods of Sequence
|
|
*/
|
|
|
|
typename Container::iterator begin() { return _val.begin(); }
|
|
typename Container::iterator end() { return _val.end(); }
|
|
typename Container::const_iterator begin() const { return _val.begin(); }
|
|
typename Container::const_iterator end() const { return _val.end(); }
|
|
|
|
typename Container::reverse_iterator rbegin() { return _val.rbegin(); }
|
|
typename Container::reverse_iterator rend() { return _val.rend(); }
|
|
typename Container::const_reverse_iterator rbegin() const { return _val.rbegin(); }
|
|
typename Container::const_reverse_iterator rend() const { return _val.rend(); }
|
|
|
|
typename Container::iterator insert (typename Container::iterator i, const typename Container::value_type& v) {
|
|
_changes.add (v);
|
|
return _val.insert (i, v);
|
|
}
|
|
|
|
typename Container::iterator erase (typename Container::iterator i) {
|
|
if (i != _val.end()) {
|
|
_changes.remove (*i);
|
|
}
|
|
return _val.erase (i);
|
|
}
|
|
|
|
typename Container::iterator erase (typename Container::iterator f, typename Container::iterator l) {
|
|
for (typename Container::const_iterator i = f; i != l; ++i) {
|
|
_changes.remove (*i);
|
|
}
|
|
return _val.erase (f, l);
|
|
}
|
|
|
|
void push_back (const typename Container::value_type& v) {
|
|
_changes.add (v);
|
|
_val.push_back (v);
|
|
}
|
|
|
|
void push_front (const typename Container::value_type& v) {
|
|
_changes.add (v);
|
|
_val.push_front (v);
|
|
}
|
|
|
|
void pop_front () {
|
|
if (!_val.empty()) {
|
|
_changes.remove (front());
|
|
}
|
|
_val.pop_front ();
|
|
}
|
|
|
|
void pop_back () {
|
|
if (!_val.empty()) {
|
|
_changes.remove (back());
|
|
}
|
|
_val.pop_back ();
|
|
}
|
|
|
|
void clear () {
|
|
for (typename Container::iterator i = _val.begin(); i != _val.end(); ++i) {
|
|
_changes.remove (*i);
|
|
}
|
|
_val.clear ();
|
|
}
|
|
|
|
typename Container::size_type size() const {
|
|
return _val.size();
|
|
}
|
|
|
|
bool empty() const {
|
|
return _val.empty();
|
|
}
|
|
|
|
Container& operator= (const Container& other) {
|
|
for (typename Container::iterator i = _val.begin(); i != _val.end(); ++i) {
|
|
_changes.remove (*i);
|
|
}
|
|
for (typename Container::iterator i = other.begin(); i != other.end(); ++i) {
|
|
_changes.add (*i);
|
|
}
|
|
return _val = other;
|
|
}
|
|
|
|
typename Container::reference front() {
|
|
return _val.front ();
|
|
}
|
|
|
|
typename Container::const_reference front() const {
|
|
return _val.front ();
|
|
}
|
|
|
|
typename Container::reference back() {
|
|
return _val.back ();
|
|
}
|
|
|
|
typename Container::const_reference back() const {
|
|
return _val.back ();
|
|
}
|
|
|
|
void sort() {
|
|
_val.sort ();
|
|
}
|
|
|
|
template<class BinaryPredicate> void sort(BinaryPredicate comp) {
|
|
_val.sort (comp);
|
|
}
|
|
|
|
const ChangeRecord& changes () const { return _changes; }
|
|
|
|
protected:
|
|
Container _val; ///< our actual container of things
|
|
ChangeRecord _changes; ///< changes to the container (adds/removes) that have happened since clear_changes() was last called
|
|
boost::function<void(const ChangeRecord&)> _update_callback;
|
|
|
|
private:
|
|
virtual SequenceProperty<Container>* create () const = 0;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* __libpbd_sequence_property_h__ */
|