MacroCommandDispatcher.hpp

#pragma once
#include <score/command/AggregateCommand.hpp>
#include <score/command/Dispatchers/ICommandDispatcher.hpp>
#include <score/command/Dispatchers/SendStrategy.hpp>
 
#include <memory>
 
template <typename Command_T, typename RedoStrategy_T, typename SendStrategy_T>
class GenericMacroCommandDispatcher final : public ICommandDispatcher
{
public:
  template <typename... Args>
  GenericMacroCommandDispatcher(Args&&... args)
      : ICommandDispatcher{std::forward<Args&&>(args)...}
      , m_aggregateCommand{std::make_unique<Command_T>()}
  {
    static_assert(
        std::is_base_of<score::AggregateCommand, Command_T>::value,
        "MacroCommandDispatcher: Command_T must be AggregateCommand-derived");
  }
 
  template <typename... Args>
  GenericMacroCommandDispatcher(
      std::unique_ptr<score::AggregateCommand> cmd, Args&&... args)
      : ICommandDispatcher{std::forward<Args&&>(args)...}
      , m_aggregateCommand{std::move(cmd)}
  {
    SCORE_ASSERT(m_aggregateCommand);
  }
 
  void submit(score::Command* cmd)
  {
    RedoStrategy_T::redo(stack().context(), *cmd);
    m_aggregateCommand->addCommand(cmd);
  }
 
  void commit()
  {
    if(m_aggregateCommand)
    {
      if(m_aggregateCommand->count() != 0)
      {
        SendStrategy_T::send(stack(), m_aggregateCommand.release());
      }
 
      m_aggregateCommand.reset();
    }
  }
 
  void rollback()
  {
    if(m_aggregateCommand)
    {
      m_aggregateCommand->undo(stack().context());
      m_aggregateCommand.reset();
    }
  }
 
  auto command() const { return m_aggregateCommand.get(); }
 
protected:
  std::unique_ptr<Command_T> m_aggregateCommand;
};
 
// Don't redo the individual commands, and redo() the aggregate command.
template <typename Command_T>
using MacroCommandDispatcher = GenericMacroCommandDispatcher<
    Command_T, RedoStrategy::Quiet, SendStrategy::Simple>;
 
// Redo the individual commands, don't redo the aggregate command
template <typename Command_T>
using RedoMacroCommandDispatcher
    = GenericMacroCommandDispatcher<Command_T, RedoStrategy::Redo, SendStrategy::Quiet>;
 
// Don't redo anything, just push
template <typename Command_T>
using QuietMacroCommandDispatcher
    = GenericMacroCommandDispatcher<Command_T, RedoStrategy::Quiet, SendStrategy::Quiet>;