Method HitTest

src/tracks/ui/SelectHandle.cpp:358–402

}

UIHandlePtr SelectHandle::HitTest
(std::weak_ptr<SelectHandle> &holder,
 const TrackPanelMouseState &st, const AudacityProject *pProject,
 const std::shared_ptr<ChannelView> &pChannelView)
{
   // This handle is a little special because there may be some state to
   // preserve during movement before the click.
   auto old = holder.lock();
   bool oldUseSnap = true;
   if (old) {
      // It should not have started listening to timer events
      if( old->mTimerHandler ) {
         wxASSERT(false);
         // Handle this eventuality anyway, don't leave a dangling back-pointer
         // in the attached event handler.
         old->mTimerHandler.reset();
      }
      oldUseSnap = old->mUseSnap;
   }

   const auto &viewInfo = ViewInfo::Get( *pProject );
   auto result = std::make_shared<SelectHandle>(
      pChannelView, oldUseSnap, TrackList::Get(*pProject), st, viewInfo);

   result = AssignUIHandlePtr(holder, result);

   //Make sure we are within the selected track
   auto pTrack = FindTrack(pChannelView->FindChannel().get());
   if (!pTrack->GetSelected())
   {
      return result;
   }

   {
      const wxRect &rect = st.rect;
      wxInt64 leftSel = viewInfo.TimeToPosition(viewInfo.selectedRegion.t0(), rect.x);
      wxInt64 rightSel = viewInfo.TimeToPosition(viewInfo.selectedRegion.t1(), rect.x);
      // Something is wrong if right edge comes before left edge
      wxASSERT(!(rightSel < leftSel));
      static_cast<void>(leftSel); // Suppress unused variable warnings if not in debug-mode
      static_cast<void>(rightSel);
   }

   return result;
}

UIHandle::Result SelectHandle::NeedChangeHighlight
(const SelectHandle &oldState, const SelectHandle &newState)