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/**********************************************************************
Audacity: A Digital Audio Editor
@file UndoTracks.cpp
Paul Licameli
**********************************************************************/
#include "UndoTracks.h"
#include "PendingTracks.h"
#include "Track.h"
#include "UndoManager.h"
// Undo/redo handling of selection changes
namespace {
struct TrackListRestorer final : UndoStateExtension {
TrackListRestorer(AudacityProject &project)
: mpTracks{ TrackList::Create(nullptr) }
{
for (auto pTrack : TrackList::Get(project)) {
if (pTrack->GetId() == TrackId{})
// Don't copy a pending added track
continue;
mpTracks->Add(pTrack->Duplicate());
}
}
void RestoreUndoRedoState(AudacityProject &project) override {
auto &dstTracks = TrackList::Get(project);
dstTracks.Clear();
for (auto pTrack : *mpTracks)
dstTracks.Add(pTrack->Duplicate());
}
bool CanUndoOrRedo(const AudacityProject &project) override {
return !PendingTracks::Get(project).HasPendingTracks();
}
const std::shared_ptr<TrackList> mpTracks;
};
UndoRedoExtensionRegistry::Entry sEntry {
[](AudacityProject &project) -> std::shared_ptr<UndoStateExtension> {
return std::make_shared<TrackListRestorer>(project);
}
};
}
TrackList *UndoTracks::Find(const UndoStackElem &state)
{
auto &exts = state.state.extensions;
auto end = exts.end(),
iter = std::find_if(exts.begin(), end, [](auto &pExt){
return dynamic_cast<TrackListRestorer*>(pExt.get());
});
if (iter != end)
return static_cast<TrackListRestorer*>(iter->get())->mpTracks.get();
return nullptr;
}
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