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/**********************************************************************
Audacity: A Digital Audio Editor
SelectionState.h
**********************************************************************/
#include "SelectionState.h"
#include "ViewInfo.h"
#include "SyncLock.h"
#include "Track.h"
#include "Project.h"
#include <cassert>
static const AudacityProject::AttachedObjects::RegisteredFactory key{
[](AudacityProject &){ return std::make_shared< SelectionState >(); }
};
SelectionState &SelectionState::Get( AudacityProject &project )
{
return project.AttachedObjects::Get< SelectionState >( key );
}
const SelectionState &SelectionState::Get( const AudacityProject &project )
{
return Get( const_cast< AudacityProject & >( project ) );
}
void SelectionState::SelectTrackLength(
ViewInfo &viewInfo, Track &track, bool syncLocked)
{
auto trackRange = syncLocked
// If we have a sync-lock group and sync-lock linking is on,
// check the sync-lock group tracks.
? SyncLock::Group(track)
// Otherwise, check for one track
: TrackList::SingletonRange(&track);
auto minOffset = trackRange.min(&Track::GetStartTime);
auto maxEnd = trackRange.max(&Track::GetEndTime);
// PRL: double click or click on track control.
// should this select all frequencies too? I think not.
viewInfo.selectedRegion.setTimes(minOffset, maxEnd);
}
void SelectionState::SelectTrack(
Track &track, bool selected, bool updateLastPicked)
{
//bool wasCorrect = (selected == track.GetSelected());
track.SetSelected(selected);
if (updateLastPicked)
mLastPickedTrack = track.SharedPointer();
//The older code below avoids an anchor on an unselected track.
/*
if (selected) {
// This handles the case of linked tracks, selecting all channels
mTracks->Select(pTrack, true);
if (updateLastPicked)
mLastPickedTrack = Track::Pointer( pTrack );
}
else {
mTracks->Select(pTrack, false);
if (updateLastPicked && pTrack == mLastPickedTrack.lock().get())
mLastPickedTrack.reset();
}
*/
}
void SelectionState::SelectRangeOfTracks(
TrackList &tracks, Track &rsTrack, Track &reTrack)
{
Track *sTrack = &rsTrack, *eTrack = &reTrack;
// Swap the track pointers if needed
auto begin = tracks.begin(),
iterS = tracks.Find(sTrack),
iterE = tracks.Find(eTrack);
auto indS = std::distance(begin, iterS),
indE = std::distance(begin, iterE);
if (indE < indS)
std::swap(sTrack, eTrack);
for (auto track :
tracks.Any().StartingWith(sTrack).EndingAfter(eTrack))
SelectTrack(*track, true, false);
}
void SelectionState::SelectNone(TrackList &tracks)
{
for (auto t : tracks)
SelectTrack(*t, false, false);
}
void SelectionState::ChangeSelectionOnShiftClick(
TrackList &tracks, Track &track)
{
// We will either extend from the first or from the last.
auto pExtendFrom = tracks.Lock(mLastPickedTrack);
if (!pExtendFrom) {
auto trackRange = tracks.Selected();
auto pFirst = *trackRange.begin();
// If our track is at or after the first, extend from the first.
if (pFirst) {
auto begin = tracks.begin(),
iterT = tracks.Find(&track),
iterF = tracks.Find(pFirst);
auto indT = std::distance(begin, iterT),
indF = std::distance(begin, iterF);
if (indT >= indF)
pExtendFrom = pFirst->SharedPointer();
}
// Our track was earlier than the first. Extend from the last.
if (!pExtendFrom)
pExtendFrom = Track::SharedPointer(*trackRange.rbegin());
}
SelectNone(tracks);
if (pExtendFrom)
SelectRangeOfTracks(tracks, track, *pExtendFrom);
else
SelectTrack(track, true, true);
mLastPickedTrack = pExtendFrom;
}
void SelectionState::HandleListSelection(TrackList &tracks, ViewInfo &viewInfo,
Track &track, bool shift, bool ctrl, bool syncLocked)
{
// AS: If the shift button is being held down, invert
// the selection on this track.
if (ctrl)
SelectTrack(track, !track.GetSelected(), true);
else {
if (shift && mLastPickedTrack.lock())
ChangeSelectionOnShiftClick(tracks, track);
else {
SelectNone(tracks);
SelectTrack(track, true, true);
SelectTrackLength(viewInfo, track, syncLocked);
}
}
}
SelectionStateChanger::SelectionStateChanger
( SelectionState &state, TrackList &tracks )
: mpState{ &state }
, mTracks{ tracks }
, mInitialLastPickedTrack{ state.mLastPickedTrack }
{
// Save initial state of track selections
const auto range = tracks.Any();
mInitialTrackSelection.clear();
mInitialTrackSelection.reserve(range.size());
for (const auto track : range) {
const bool isSelected = track->GetSelected();
mInitialTrackSelection.push_back(isSelected);
}
}
SelectionStateChanger::~SelectionStateChanger()
{
if ( mpState ) {
// roll back changes
mpState->mLastPickedTrack = mInitialLastPickedTrack;
std::vector<bool>::const_iterator
it = mInitialTrackSelection.begin(),
end = mInitialTrackSelection.end();
for (auto track : mTracks) {
if (it == end)
break;
track->SetSelected( *it++ );
}
}
}
void SelectionStateChanger::Commit()
{
mpState = nullptr;
}
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