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/**********************************************************************
Audacity: A Digital Audio Editor
@file ChannelAttachments.cpp
Dominic Mazzoni
Paul Licameli split from Track.cpp
*//*******************************************************************/
#include "ChannelAttachments.h"
ChannelAttachment::~ChannelAttachment() = default;
ChannelAttachmentsBase &
ChannelAttachmentsBase::operator=(ChannelAttachmentsBase &&other)
{
assert(typeid(*this) == typeid(other));
mAttachments = move(other.mAttachments);
return *this;
}
void ChannelAttachment::CopyTo(Track&, size_t) const
{
}
void ChannelAttachment::Reparent(const std::shared_ptr<Track> &, size_t)
{
}
void ChannelAttachment::WriteXMLAttributes(XMLWriter &, size_t) const
{
}
bool ChannelAttachment::HandleXMLAttribute(
const std::string_view &, const XMLAttributeValueView &, size_t)
{
return false;
}
ChannelAttachment &ChannelAttachmentsBase::Get(
const AttachedTrackObjects::RegisteredFactory &key,
Track &track, size_t iChannel)
{
// Precondition of this function; satisfies precondition of factory below
assert(iChannel < track.NChannels());
auto &attachments = track.AttachedObjects::Get<ChannelAttachmentsBase>(key);
auto &objects = attachments.mAttachments;
if (iChannel >= objects.size())
objects.resize(iChannel + 1);
auto &pObject = objects[iChannel];
if (!pObject) {
// Create on demand
pObject = attachments.mFactory(track, iChannel);
assert(pObject); // Precondition of constructor
}
return *pObject;
}
ChannelAttachment *ChannelAttachmentsBase::Find(
const AttachedTrackObjects::RegisteredFactory &key,
Track *pTrack, size_t iChannel)
{
assert(!pTrack || iChannel < pTrack->NChannels());
if (!pTrack)
return nullptr;
const auto pAttachments =
pTrack->AttachedObjects::Find<ChannelAttachmentsBase>(key);
// do not create on demand
if (!pAttachments || iChannel >= pAttachments->mAttachments.size())
return nullptr;
return pAttachments->mAttachments[iChannel].get();
}
ChannelAttachmentsBase::ChannelAttachmentsBase(Track &track, Factory factory)
: mFactory{ move(factory) }
{
const auto nChannels = track.NChannels();
for (size_t iChannel = 0; iChannel < nChannels; ++iChannel)
mAttachments.push_back(mFactory(track, iChannel));
}
ChannelAttachmentsBase::~ChannelAttachmentsBase() = default;
void ChannelAttachmentsBase::CopyTo(Track &track) const
{
// Maybe making a narrow empty copy so limit to the other track's number
// of channels
const size_t nn = std::min(mAttachments.size(), track.NChannels());
for (size_t ii = 0; ii < nn; ++ii) {
if (mAttachments[ii])
mAttachments[ii]->CopyTo(track, ii);
}
}
void ChannelAttachmentsBase::Reparent(const std::shared_ptr<Track> &parent)
{
const size_t nn = mAttachments.size();
for (size_t ii = 0; ii < nn; ++ii) {
if (mAttachments[ii])
mAttachments[ii]->Reparent(parent, ii);
}
}
void ChannelAttachmentsBase::WriteXMLAttributes(XMLWriter &writer) const
{
const size_t nn = mAttachments.size();
for (size_t ii = 0; ii < nn; ++ii) {
if (mAttachments[ii])
mAttachments[ii]->WriteXMLAttributes(writer, ii);
}
}
bool ChannelAttachmentsBase::HandleXMLAttribute(
const std::string_view& attr, const XMLAttributeValueView& valueView)
{
size_t ii = 0;
return any_of(mAttachments.begin(), mAttachments.end(),
[&](auto &pAttachment) {
bool result = pAttachment &&
pAttachment->HandleXMLAttribute(attr, valueView, ii);
++ii;
return result;
});
}
void ChannelAttachmentsBase::MakeStereo(const std::shared_ptr<Track> &parent,
ChannelAttachmentsBase &&other)
{
assert(typeid(*this) == typeid(other));
assert(Size() <= 1);
assert(other.Size() <= 1);
if (mAttachments.empty())
mAttachments.resize(1);
auto index = mAttachments.size();
for (auto &ptr : other.mAttachments) {
if (auto &pAttachment = mAttachments.emplace_back(move(ptr)))
pAttachment->Reparent(parent, index++);
}
other.mAttachments.clear();
}
void ChannelAttachmentsBase::SwapChannels(const std::shared_ptr<Track> &parent)
{
assert(Size() <= 2);
if (mAttachments.empty())
return;
mAttachments.resize(2);
std::swap(mAttachments[0], mAttachments[1]);
for (auto ii : { 0, 1 })
if (const auto &pAttachment = mAttachments[ii])
pAttachment->Reparent(parent, ii);
}
void ChannelAttachmentsBase::Erase(const std::shared_ptr<Track> &parent,
size_t index)
{
auto size = mAttachments.size();
if (index < size) {
mAttachments.erase(mAttachments.begin() + index);
for (--size; index < size; ++index)
if (auto &pAttachment = mAttachments[index])
pAttachment->Reparent(parent, index);
}
}
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