CommandHandler.cpp

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/**********************************************************************
 
   Audacity - A Digital Audio Editor
   Copyright 1999-2009 Audacity Team
   File License: wxWidgets
 
   Dan Horgan
 
******************************************************************//*******************************************************************/
 
 
#include "CommandHandler.h"
 
#include "../ActiveProject.h"
#include "Project.h"
#include "AppCommandEvent.h"
#include "ScriptCommandRelay.h"
#include "CommandContext.h"
#include "../commands/Command.h"
#include "Viewport.h"
 
CommandHandler::CommandHandler()
{
}
 
CommandHandler::~CommandHandler()
{
}
 
void CommandHandler::OnReceiveCommand(AppCommandEvent &event)
{
   // First retrieve the actual command from the event 'envelope'.
   OldStyleCommandPointer cmd = event.GetCommand();
 
   if (const auto pProject = GetActiveProject().lock()) {
      // Then apply it to current application & project.  Note that the
      // command may change the context - for example, switching to a
      // different project.
      CommandContext context{ *pProject };
      auto result = GuardedCall<bool>( [&] {
         return cmd->Apply( context );
      });
      wxUnusedVar(result);
 
      // Redraw the project
      Viewport::Get(context.project).Redraw();
   }
}