72 lines
1.1 KiB
C++
72 lines
1.1 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 06.01.2017
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*
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* Undo subsystem for 4coder
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*
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*/
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// TOP
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//
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// Undo Basics
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//
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enum Edit_Type{
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ED_NORMAL,
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ED_REVERSE_NORMAL,
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ED_UNDO,
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ED_REDO,
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};
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struct Edit_Step{
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Edit_Type type;
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union{
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struct{
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b32 can_merge;
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Buffer_Edit edit;
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u32 next_block;
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u32 prev_block;
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};
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struct{
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u32 first_child;
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u32 inverse_first_child;
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u32 inverse_child_count;
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u32 special_type;
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};
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};
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u32 child_count;
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};
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struct Edit_Stack{
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u8 *strings;
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u32 size, max;
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Edit_Step *edits;
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u32 edit_count, edit_max;
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};
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struct Small_Edit_Stack{
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u8 *strings;
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u32 size, max;
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Buffer_Edit *edits;
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u32 edit_count, edit_max;
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};
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struct Undo_Data{
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Edit_Stack undo;
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Edit_Stack redo;
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Edit_Stack history;
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Small_Edit_Stack children;
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u32 history_block_count;
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u32 history_head_block;
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u32 edit_history_cursor;
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b32 current_block_normal;
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};
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// BOTTOM
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