anonymous_namespace{ChannelView.cpp}::TrackPositioner Struct Reference

Inheritance diagram for anonymous_namespace{ChannelView.cpp}::TrackPositioner:

Collaboration diagram for anonymous_namespace{ChannelView.cpp}::TrackPositioner:

Public Member Functions
	TrackPositioner (AudacityProject &project)
	TrackPositioner (const TrackPositioner &)=delete
TrackPositioner &	operator= (const TrackPositioner &)=delete
void	OnUpdate (const TrackListEvent &e)
Public Member Functions inherited from ClientData::Base
virtual	~Base ()

Public Attributes
AudacityProject &	mProject
Observer::Subscription	mSubscription

Detailed Description

Attached to each project, it receives track list events and maintains the cache of cumulative track view heights for use by TrackPanel.

Definition at line 253 of file ChannelView.cpp.

Constructor & Destructor Documentation

TrackPositioner() [1/2]

anonymous_namespace{ChannelView.cpp}::TrackPositioner::TrackPositioner ( AudacityProject &  project )

inlineexplicit

Definition at line 257 of file ChannelView.cpp.

      : mProject{ project }
   {
      mSubscription = PendingTracks::Get(project)
         .Subscribe(*this, &TrackPositioner::OnUpdate);
   }

References PendingTracks::Get(), project, and Observer::Publisher< Message, NotifyAll >::Subscribe().

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TrackPositioner() [2/2]

anonymous_namespace{ChannelView.cpp}::TrackPositioner::TrackPositioner ( const TrackPositioner &  )

delete

Member Function Documentation

OnUpdate()

void anonymous_namespace{ChannelView.cpp}::TrackPositioner::OnUpdate ( const TrackListEvent &  e )

inline

Definition at line 266 of file ChannelView.cpp.

   {
      switch (e.mType) {
      case TrackListEvent::ADDITION:
      case TrackListEvent::DELETION:
      case TrackListEvent::PERMUTED:
      case TrackListEvent::RESIZING:
         break;
      default:
         return;
      }
      auto iter =
         TrackList::Get(mProject).Find(e.mpTrack.lock().get());
      if (!*iter)
         return;
 
      auto prev = iter;
      auto yy = ChannelView::GetCumulativeHeight(*--prev);
 
      while (auto pTrack = *iter) {
         for (auto pChannel : (*iter)->Channels()) {
            auto &view = ChannelView::Get(*pChannel);
            view.SetCumulativeHeightBefore(yy);
            yy += view.GetHeight();
         }
         ++iter;
      }
   }

References TrackListEvent::ADDITION, TrackListEvent::DELETION, TrackList::Find(), TrackList::Get(), ChannelView::Get(), ChannelView::GetCumulativeHeight(), TrackListEvent::mpTrack, TrackListEvent::mType, TrackListEvent::PERMUTED, and TrackListEvent::RESIZING.

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operator=()

TrackPositioner & anonymous_namespace{ChannelView.cpp}::TrackPositioner::operator= ( const TrackPositioner &  )

delete

Member Data Documentation

mProject

AudacityProject& anonymous_namespace{ChannelView.cpp}::TrackPositioner::mProject

Definition at line 255 of file ChannelView.cpp.

mSubscription

Observer::Subscription anonymous_namespace{ChannelView.cpp}::TrackPositioner::mSubscription

Definition at line 295 of file ChannelView.cpp.

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The documentation for this struct was generated from the following file:

• ChannelView.cpp