4coder/4ed_undo.cpp

71 lines
1.0 KiB
C++

/*
* Mr. 4th Dimention - Allen Webster
*
* 06.01.2017
*
* Undo subsystem for 4coder
*
*/
// TOP
//
// Undo Basics
//
enum Edit_Type{
ED_NORMAL,
ED_REVERSE_NORMAL,
ED_UNDO,
ED_REDO,
};
struct Edit_Step{
Edit_Type type;
union{
struct{
b32 can_merge;
Buffer_Edit edit;
i32 next_block;
i32 prev_block;
};
struct{
i32 first_child;
i32 inverse_first_child;
i32 inverse_child_count;
i32 special_type;
};
};
i32 child_count;
};
struct Edit_Stack{
u8 *strings;
i32 size, max;
Edit_Step *edits;
i32 edit_count, edit_max;
};
struct Small_Edit_Stack{
u8 *strings;
i32 size, max;
Buffer_Edit *edits;
i32 edit_count, edit_max;
};
struct Undo_Data{
Edit_Stack undo;
Edit_Stack redo;
Edit_Stack history;
Small_Edit_Stack children;
i32 history_block_count, history_head_block;
i32 edit_history_cursor;
b32 current_block_normal;
};
// BOTTOM