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/**********************************************************************
Audacity: A Digital Audio Editor
TrackFocus.cpp
Leland Lucius
and lots of other contributors
*//*******************************************************************/
#include "TrackFocus.h"
#include "BasicUI.h"
#include "Project.h"
#include "Track.h"
TrackFocusCallbacks::~TrackFocusCallbacks() = default;
TrackList &TrackFocus::GetTracks()
{
return TrackList::Get( mProject );
}
const TrackList &TrackFocus::GetTracks() const
{
return TrackList::Get( mProject );
}
// Returns currently focused track
// if that track no longer exists, if there is a track at
// the same position, use that, else if there is a first
// track, use that.
std::shared_ptr<Track> TrackFocus::GetFocus()
{
auto focusedTrack = mFocusedTrack.lock();
if( !focusedTrack ) {
if (mNumFocusedTrack >=1) {
// This prevents the focus from being unnecessarily set to track 1
// when effects are applied. (Applying an effect can change
// the pointers of the selected tracks.)
focusedTrack = FindTrack(mNumFocusedTrack);
}
if (!focusedTrack) {
focusedTrack =
Track::SharedPointer(*GetTracks().Any().first);
// only call SetFocus if the focus has changed to avoid
// unnecessary focus events
if (focusedTrack)
focusedTrack = SetFocus();
}
}
if( !TrackNum( focusedTrack ) )
{
mFocusedTrack.reset();
return {};
}
return( focusedTrack );
}
std::shared_ptr<Track> TrackFocus::PeekFocus() const
{
return mFocusedTrack.lock();
}
// Changes focus to a specified track
std::shared_ptr<Track> TrackFocus::SetFocus(
std::shared_ptr<Track> track, bool focusPanel)
{
if (mpCallbacks)
mpCallbacks->BeginChangeFocus();
if (!track)
track = Track::SharedPointer(*GetTracks().begin());
const bool focusChanged = (PeekFocus() != track);
if (focusChanged) {
mFocusedTrack = track;
}
if (focusChanged || focusPanel)
BasicUI::CallAfter([
wFocus = weak_from_this(), focusPanel
]{
if (auto pFocus = wFocus.lock())
pFocus->Publish({ focusPanel });
});
mNumFocusedTrack = TrackNum(track);
if (mpCallbacks)
mpCallbacks->EndChangeFocus(track);
return track;
}
int TrackFocus::TrackNum(const std::shared_ptr<Track> &target) const
{
// Find 1-based position of the target in the visible tracks, or 0 if not
// found
int ndx = 0;
for (auto t : GetTracks()) {
ndx++;
if( t == target.get() )
{
return ndx;
}
}
return 0;
}
std::shared_ptr<Track> TrackFocus::FindTrack(int num) const
{
int ndx = 0;
for (auto t : TrackList::Get(mProject)) {
ndx++;
if( ndx == num )
return t->SharedPointer();
}
return {};
}
static const AudacityProject::AttachedObjects::RegisteredFactory key{
[](AudacityProject &parent){
return std::make_shared<TrackFocus>(parent);
}
};
TrackFocus &TrackFocus::Get( AudacityProject &project )
{
return project.AttachedObjects::Get< TrackFocus >( key );
}
const TrackFocus &TrackFocus::Get( const AudacityProject &project )
{
return Get( const_cast< AudacityProject & >( project ) );
}
TrackFocus::TrackFocus( AudacityProject &project )
: mProject{ project }
{
}
TrackFocus::~TrackFocus()
{
}
void TrackFocus::SetCallbacks(std::unique_ptr<TrackFocusCallbacks> pCallbacks)
{
mpCallbacks = move(pCallbacks);
}
Track *TrackFocus::Get()
{
return GetFocus().get();
}
void TrackFocus::Set(Track *pTrack, bool focusPanel)
{
SetFocus(Track::SharedPointer(pTrack), focusPanel);
}
void TrackFocus::MessageForScreenReader(const TranslatableString &message)
{
if (mpCallbacks)
mpCallbacks->MessageForScreenReader(message);
}
void TrackFocus::UpdateAccessibility()
{
if (mpCallbacks)
mpCallbacks->UpdateAccessibility();
}
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