SelectedRegion.cpp

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/**********************************************************************
 
Audacity: A Digital Audio Editor
 
SelectedRegion.cpp
 
Paul Licameli
 
*******************************************************************/
 
#include "SelectedRegion.h"
 
#include "XMLWriter.h"
#include "XMLAttributeValueView.h"
 
const char* SelectedRegion::sDefaultT0Name = "selStart";
const char *SelectedRegion::sDefaultT1Name = "selEnd";
 
namespace {
const char* sDefaultF0Name = "selLow";
const char* sDefaultF1Name = "selHigh";
}
 
void SelectedRegion::WriteXMLAttributes
(XMLWriter &xmlFile,
 const char *legacyT0Name, const char *legacyT1Name) const
// may throw
{
   xmlFile.WriteAttr(legacyT0Name, t0(), 10);
   xmlFile.WriteAttr(legacyT1Name, t1(), 10);
   if (f0() >= 0)
      xmlFile.WriteAttr(sDefaultF0Name, f0(), 10);
   if (f1() >= 0)
      xmlFile.WriteAttr(sDefaultF1Name, f1(), 10);
}
 
bool SelectedRegion::HandleXMLAttribute
(const std::string_view &attr, const XMLAttributeValueView &value,
 const char *legacyT0Name, const char *legacyT1Name)
{
   // Keep this function consistent with the table in the next!
   typedef bool (SelectedRegion::*Setter)(double, bool);
   Setter setter = 0;
   if (attr == legacyT0Name)
      setter = &SelectedRegion::setT0;
   else if (attr == legacyT1Name)
      setter = &SelectedRegion::setT1;
   else if (attr == sDefaultF0Name)
      setter = &SelectedRegion::setF0;
   else if (attr == sDefaultF1Name)
      setter = &SelectedRegion::setF1;
   else
      return false;
 
   double dblValue;
 
   if (!value.TryGet(dblValue))
      return false;
 
   // False means don't flip time or frequency boundaries
   (void)(this->*setter)(dblValue, false);
   return true;
}
 
XMLMethodRegistryBase::Mutators<SelectedRegion>
SelectedRegion::Mutators(
   const char *legacyT0Name, const char *legacyT1Name)
{
   // Keep this table consistent with the previous function!
   return {
      { legacyT0Name, [=](auto &selectedRegion, auto value){
         selectedRegion
            .HandleXMLAttribute(legacyT0Name, value,
                                legacyT0Name, legacyT1Name);
      } },
      { legacyT1Name, [=](auto &selectedRegion, auto value){
         selectedRegion
            .HandleXMLAttribute(legacyT1Name, value,
                                legacyT0Name, legacyT1Name);
      } },
      { sDefaultF0Name, [=](auto &selectedRegion, auto value){
         selectedRegion
            .HandleXMLAttribute(sDefaultF0Name, value, "", "");
      } },
      { sDefaultF1Name, [=](auto &selectedRegion, auto value){
         selectedRegion
            .HandleXMLAttribute(sDefaultF1Name, value, "", "");
      } },
   };
};