233 lines
6.1 KiB
C++
233 lines
6.1 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 19.08.2015
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*
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* Command management functions for 4coder
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*
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*/
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// TOP
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#define Command_Function_Sig(name) \
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void (name)(System_Functions *system, struct Command_Data *command, struct Command_Binding binding)
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typedef Command_Function_Sig(*Command_Function);
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struct Command_Binding{
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Command_Function function;
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union{
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Custom_Command_Function *custom;
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u64 custom_id;
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};
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u64 hash;
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};
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static Command_Binding null_command_binding = {0};
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struct Command_Map{
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Command_Map *parent;
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Command_Binding vanilla_keyboard_default[8];
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Command_Binding *commands;
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u32 count, max;
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};
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#define COMMAND_HASH_EMPTY 0
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#define COMMAND_HASH_ERASED max_u64
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internal void command_null(Command_Data *command);
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internal u64
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map_hash(Key_Code event_code, u8 modifiers){
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u64 result = (event_code << 8) | modifiers;
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return(result);
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}
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internal b32
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map_add(Command_Map *map, Key_Code event_code, u8 modifiers, Command_Function function, Custom_Command_Function *custom = 0, b32 override_original = true){
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b32 result = false;
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Assert(map->count * 8 < map->max * 7);
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u64 hash = map_hash(event_code, modifiers);
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u32 max = map->max;
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u32 index = hash % max;
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Command_Binding entry = map->commands[index];
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while (entry.function != 0 && entry.hash != COMMAND_HASH_ERASED){
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if (entry.hash == hash){
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result = true;
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break;
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}
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index = (index + 1) % max;
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entry = map->commands[index];
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}
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if (override_original || !result){
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Command_Binding bind;
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bind.function = function;
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bind.custom = custom;
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bind.hash = hash;
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map->commands[index] = bind;
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++map->count;
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}
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return(result);
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}
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inline b32
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map_add(Command_Map *map, Key_Code event_code, u8 modifiers, Command_Function function, u64 custom_id, b32 override_original = true){
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return (map_add(map, event_code, modifiers, function, (Custom_Command_Function*)custom_id, override_original));
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}
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internal b32
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map_find_entry(Command_Map *map, Key_Code event_code, u8 modifiers, u32 *index_out){
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u64 hash = map_hash(event_code, modifiers);
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u32 max = map->max;
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u32 index = hash % max;
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b32 result = false;
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Command_Binding entry = map->commands[index];
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while (entry.function != 0){
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if (entry.hash == hash){
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*index_out = index;
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result = true;
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break;
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}
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index = (index + 1) % max;
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entry = map->commands[index];
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}
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return(result);
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}
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internal b32
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map_find(Command_Map *map, Key_Code event_code, u8 modifiers, Command_Binding *bind_out){
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u32 index = 0;
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b32 result = map_find_entry(map, event_code, modifiers, &index);
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if (result){
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*bind_out = map->commands[index];
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}
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return(result);
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}
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internal b32
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map_drop(Command_Map *map, Key_Code event_code, u8 modifiers){
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u32 index = 0;
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b32 result = map_find_entry(map, event_code, modifiers, &index);
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if (result){
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map->commands[index].function = 0;
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map->commands[index].hash = COMMAND_HASH_ERASED;
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}
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return(result);
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}
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internal void
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map_clear(Command_Map *commands){
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u32 max = commands->max;
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memset(commands->commands, 0, max*sizeof(*commands->commands));
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memset(commands->vanilla_keyboard_default, 0, sizeof(commands->vanilla_keyboard_default));
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commands->count = 0;
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}
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internal b32
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map_init(Command_Map *commands, Partition *part, u32 max, Command_Map *parent){
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b32 result = false;
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if (commands->commands == 0){
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max = clamp_bottom((u32)6, max);
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commands->parent = parent;
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commands->commands = push_array(part, Command_Binding, max);
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commands->count = 0;
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commands->max = max;
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result = true;
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}
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return(result);
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}
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internal b32
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map_get_modifiers_hash(u8 modifiers, u32 *hash_out){
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b32 result = true;
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u32 hash = 0;
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if (modifiers & MDFR_SHIFT){
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hash += 0x1;
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}
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if (modifiers & MDFR_CTRL){
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hash += 0x2;
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}
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if (modifiers & MDFR_ALT){
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hash += 0x4;
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}
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*hash_out = hash;
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return(result);
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}
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internal void
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map_get_vanilla_keyboard_default(Command_Map *map, u8 command, Command_Binding *bind_out){
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u32 modifiers_hashed = 0;
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if (map_get_modifiers_hash(command, &modifiers_hashed)){
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*bind_out = map->vanilla_keyboard_default[modifiers_hashed];
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}
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}
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internal Command_Binding
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map_extract(Command_Map *map, Key_Event_Data key){
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Command_Binding bind = {0};
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b32 ctrl = key.modifiers[MDFR_CONTROL_INDEX];
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b32 alt = key.modifiers[MDFR_ALT_INDEX];
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b32 command = key.modifiers[MDFR_COMMAND_INDEX];
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b32 shift = key.modifiers[MDFR_SHIFT_INDEX];
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u8 mod_flags = MDFR_NONE;
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if (ctrl) mod_flags |= MDFR_CTRL;
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if (command) mod_flags |= MDFR_COMMAND;
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if (alt) mod_flags |= MDFR_ALT;
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if (shift) mod_flags |= MDFR_SHIFT;
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Key_Code code = key.character_no_caps_lock;
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if (code == 0){
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code = key.keycode;
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map_find(map, code, mod_flags, &bind);
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}
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else{
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if (code != '\n' && code != '\t' && code != ' '){
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mod_flags &= ~(MDFR_SHIFT);
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}
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map_find(map, code, mod_flags, &bind);
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if (bind.function == 0){
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map_get_vanilla_keyboard_default(map, mod_flags, &bind);
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}
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}
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return(bind);
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}
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internal Command_Binding
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map_extract_recursive(Command_Map *map, Key_Event_Data key){
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Command_Binding cmd_bind = {0};
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Command_Map *visited_maps[16] = {0};
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i32 visited_top = 0;
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while (map){
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cmd_bind = map_extract(map, key);
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if (cmd_bind.function == 0){
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if (visited_top < ArrayCount(visited_maps)){
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visited_maps[visited_top++] = map;
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map = map->parent;
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for (i32 i = 0; i < visited_top; ++i){
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if (map == visited_maps[i]){
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map = 0;
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break;
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}
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}
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}
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else{
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map = 0;
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}
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}
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else{
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map = 0;
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}
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}
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return(cmd_bind);
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}
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// BOTTOM
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