Move class ZoomInfo to separate files

src/ViewInfo.cpp

@@ -15,133 +15,12 @@ Paul Licameli
 #include <algorithm>
 
 #include "AudioIOBase.h"
-#include "prefs/GUISettings.h"
 #include "Prefs.h"
 #include "Project.h"
 #include "xml/XMLWriter.h"
 #include "prefs/TracksBehaviorsPrefs.h"
 #include "xml/XMLWriter.h"
 
-namespace {
-static const double gMaxZoom = 6000000;
-static const double gMinZoom = 0.001;
-}
-
-ZoomInfo &ZoomInfo::Get( AudacityProject &project )
-{
-   return ViewInfo::Get( project );
-}
-
-const ZoomInfo &ZoomInfo::Get( const AudacityProject &project )
-{
-   return Get( const_cast< AudacityProject & >( project ) );
-}
-
-ZoomInfo::ZoomInfo(double start, double pixelsPerSecond)
-   : vpos(0)
-   , h(start)
-   , zoom(pixelsPerSecond)
-{
-   UpdatePrefs();
-}
-
-ZoomInfo::~ZoomInfo()
-{
-}
-
-void ZoomInfo::UpdatePrefs()
-{
-   dBr = gPrefs->Read(ENV_DB_KEY, ENV_DB_RANGE);
-}
-
-/// Converts a position (mouse X coordinate) to
-/// project time, in seconds.  Needs the left edge of
-/// the track as an additional parameter.
-double ZoomInfo::PositionToTime(wxInt64 position,
-   wxInt64 origin
-   , bool // ignoreFisheye
-) const
-{
-   return h + (position - origin) / zoom;
-}
-
-
-/// STM: Converts a project time to screen x position.
-wxInt64 ZoomInfo::TimeToPosition(double projectTime,
-   wxInt64 origin
-   , bool // ignoreFisheye
-) const
-{
-   double t = 0.5 + zoom * (projectTime - h) + origin ;
-   if( t < wxINT64_MIN )
-      return wxINT64_MIN;
-   if( t > wxINT64_MAX )
-      return wxINT64_MAX;
-   t = floor( t );
-   return t;
-}
-
-// This always ignores the fisheye.  Use with caution!
-// You should prefer to call TimeToPosition twice, for endpoints, and take the difference!
-double ZoomInfo::TimeRangeToPixelWidth(double timeRange) const
-{
-   return timeRange * zoom;
-}
-
-bool ZoomInfo::ZoomInAvailable() const
-{
-   return zoom < gMaxZoom;
-}
-
-bool ZoomInfo::ZoomOutAvailable() const
-{
-   return zoom > gMinZoom;
-}
-
-double ZoomInfo::GetZoom( ) const { return zoom;};
-double ZoomInfo::GetMaxZoom( ) { return gMaxZoom;};
-double ZoomInfo::GetMinZoom( ) { return gMinZoom;};
-
-void ZoomInfo::SetZoom(double pixelsPerSecond)
-{
-   zoom = std::max(gMinZoom, std::min(gMaxZoom, pixelsPerSecond));
-// DA: Avoids stuck in snap-to
-#ifdef EXPERIMENTAL_DA
-   // Disable snapping if user zooms in a long way.
-   // Helps stop users be trapped in snap-to.
-   // The level chosen is in sample viewing range with samples
-   // still quite close together.
-   if( zoom > (gMaxZoom * 0.06  ))
-   {
-      AudacityProject * project = GetActiveProject();
-      if( project )
-         project->OnSnapToOff();
-   }
-#endif
-}
-
-void ZoomInfo::ZoomBy(double multiplier)
-{
-   SetZoom(zoom * multiplier);
-}
-
-void ZoomInfo::FindIntervals
-   (double /*rate*/, Intervals &results, wxInt64 width, wxInt64 origin) const
-{
-   results.clear();
-   results.reserve(2);
-
-   const wxInt64 rightmost(origin + (0.5 + width));
-   wxASSERT(origin <= rightmost);
-   {
-      results.push_back(Interval(origin, zoom, false));
-   }
-
-   if (origin < rightmost)
-      results.push_back(Interval(rightmost, 0, false));
-   wxASSERT(!results.empty() && results[0].position == origin);
-}
-
 static const AudacityProject::AttachedObjects::RegisteredFactory key{
    []( AudacityProject &project ) {
       auto result =