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/**********************************************************************
Audacity: A Digital Audio Editor
@file SyncLock.cpp
@brief implements sync-lock logic
Paul Licameli split from Track.cpp
**********************************************************************/
#include "SyncLock.h"
#include "PendingTracks.h"
#include "Prefs.h"
#include "Project.h"
#include "Track.h"
static const AudacityProject::AttachedObjects::RegisteredFactory
sSyncLockStateKey{
[]( AudacityProject &project ){
auto result = std::make_shared< SyncLockState >( project );
return result;
}
};
SyncLockState &SyncLockState::Get( AudacityProject &project )
{
return project.AttachedObjects::Get< SyncLockState >(
sSyncLockStateKey );
}
const SyncLockState &SyncLockState::Get( const AudacityProject &project )
{
return Get( const_cast< AudacityProject & >( project ) );
}
SyncLockState::SyncLockState(AudacityProject &project)
: mProject{project}
, mIsSyncLocked(SyncLockTracks.Read())
{
}
bool SyncLockState::IsSyncLocked() const
{
return mIsSyncLocked;
}
void SyncLockState::SetSyncLock(bool flag)
{
if (flag != mIsSyncLocked) {
mIsSyncLocked = flag;
Publish({ flag });
}
}
namespace {
inline bool IsSyncLockableNonSeparatorTrack(const Track &track)
{
return GetSyncLockPolicy::Call(track) == SyncLockPolicy::Grouped;
}
inline bool IsSeparatorTrack(const Track &track)
{
return GetSyncLockPolicy::Call(track) == SyncLockPolicy::EndSeparator;
}
bool IsGoodNextSyncLockTrack(const Track &t, bool inSeparatorSection)
{
const bool isSeparator = IsSeparatorTrack(t);
if (inSeparatorSection)
return isSeparator;
else if (isSeparator)
return true;
else
return IsSyncLockableNonSeparatorTrack(t);
}
}
bool SyncLock::IsSyncLockSelected(const Track &track)
{
auto pList = track.GetOwner();
if (!pList)
return false;
auto p = pList->GetOwner();
if (!p || !SyncLockState::Get( *p ).IsSyncLocked())
return false;
auto &orig = PendingTracks::Get(*p).SubstituteOriginalTrack(track);
auto trackRange = Group(orig);
if (trackRange.size() <= 1) {
// Not in a sync-locked group.
// Return true iff selected and of a sync-lockable type.
return (IsSyncLockableNonSeparatorTrack(orig) ||
IsSeparatorTrack(orig)) && track.GetSelected();
}
// Return true iff any track in the group is selected.
return *(trackRange + &Track::IsSelected).begin();
}
bool SyncLock::IsSelectedOrSyncLockSelected(const Track &track)
{
return track.IsSelected() || IsSyncLockSelected(track);
}
namespace {
std::pair<Track *, Track *> FindSyncLockGroup(Track &member)
{
// A non-trivial sync-locked group is a maximal sub-sequence of the tracks
// consisting of any positive number of audio tracks followed by zero or
// more label tracks.
// Step back through any label tracks.
auto pList = member.GetOwner();
auto ppMember = pList->Find(&member);
while (*ppMember && IsSeparatorTrack(**ppMember))
--ppMember;
// Step back through the wave and note tracks before the label tracks.
Track *first = nullptr;
while (*ppMember && IsSyncLockableNonSeparatorTrack(**ppMember)) {
first = *ppMember;
--ppMember;
}
if (!first)
// Can't meet the criteria described above. In that case,
// consider the track to be the sole member of a group.
return { &member, &member };
auto last = pList->Find(first);
auto next = last;
bool inLabels = false;
while (*++next) {
if (!IsGoodNextSyncLockTrack(**next, inLabels))
break;
last = next;
inLabels = IsSeparatorTrack(**last);
}
return { first, *last };
}
}
TrackIterRange<Track> SyncLock::Group(Track &track)
{
auto pList = track.GetOwner();
assert(pList); // precondition
auto tracks = FindSyncLockGroup(const_cast<Track&>(track));
return pList->Any()
.StartingWith(tracks.first).EndingAfter(tracks.second);
}
DEFINE_ATTACHED_VIRTUAL(GetSyncLockPolicy) {
return [](auto&){ return SyncLockPolicy::Isolated; };
}
BoolSetting SyncLockTracks{ "/GUI/SyncLockTracks", false };
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