74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
#include <list>
|
|
#include <map>
|
|
|
|
namespace AtlasMessage
|
|
{
|
|
|
|
struct Command
|
|
{
|
|
virtual ~Command() {}
|
|
virtual void Do() = 0;
|
|
virtual void Undo() = 0;
|
|
virtual void Redo() = 0;
|
|
virtual void Merge(Command* prev) = 0;
|
|
virtual const char* GetType() const = 0;
|
|
};
|
|
|
|
class CommandProc
|
|
{
|
|
public:
|
|
CommandProc();
|
|
~CommandProc();
|
|
|
|
// Should be called before shutting down, so it can free
|
|
// references to entities/etc that are stored in commands
|
|
void Destroy();
|
|
|
|
void Submit(Command* cmd);
|
|
|
|
void Undo();
|
|
void Redo();
|
|
void Merge();
|
|
|
|
private:
|
|
std::list<Command*> m_Commands;
|
|
typedef std::list<Command*>::iterator cmdIt;
|
|
cmdIt m_CurrentCommand;
|
|
};
|
|
|
|
typedef Command* (*cmdHandler)(const void*);
|
|
typedef std::map<std::string, cmdHandler> cmdHandlers;
|
|
extern cmdHandlers& GetCmdHandlers();
|
|
|
|
CommandProc& GetCommandProc();
|
|
|
|
struct DataCommand : public Command // so commands can optionally override (De|Con)struct
|
|
{
|
|
void Destruct() {};
|
|
void Construct() {};
|
|
// MergeWithSelf should update 'prev' to include the effects of 'this'
|
|
void MergeWithSelf(void*) { debug_warn("MergeWithSelf unimplemented in some command"); }
|
|
};
|
|
|
|
#define BEGIN_COMMAND(t) \
|
|
class c##t : public DataCommand \
|
|
{ \
|
|
d##t* d; \
|
|
public: \
|
|
c##t(d##t* data) : d(data) { Construct(); } \
|
|
~c##t() { Destruct(); delete d; } \
|
|
static Command* Create(const void* data) { return new c##t((d##t*)data); } \
|
|
virtual void Merge(Command* prev) { MergeWithSelf((c##t*)prev); } \
|
|
virtual const char* GetType() const { return #t; }
|
|
|
|
#define END_COMMAND(t) \
|
|
}; \
|
|
namespace register_command_##t { \
|
|
struct init { init() { \
|
|
bool notAlreadyRegisted = GetCmdHandlers().insert(std::pair<std::string, cmdHandler>("c"#t, &c##t ::Create)).second; \
|
|
debug_assert(notAlreadyRegisted); \
|
|
} } init; \
|
|
};
|
|
|
|
}
|