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The keycode in key events is affected by modifiers by default.

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This behavior can be customized with SDL_HINT_KEYCODE_OPTIONS.
This commit is contained in:
Sam Lantinga 2024-06-22 00:04:33 -07:00
parent 1e81424b3d
commit 90034b16dc
6 changed files with 149 additions and 29 deletions
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101
src/events/SDL_keyboard.c
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@ -30,16 +30,18 @@
/* Global keyboard information */
typedef enum
{
KEYBOARD_HARDWARE = 0x01,
KEYBOARD_VIRTUAL = 0x02,
KEYBOARD_AUTORELEASE = 0x04,
KEYBOARD_IGNOREMODIFIERS = 0x08
} SDL_KeyboardFlags;
#define KEYBOARD_HARDWARE 0x01
#define KEYBOARD_VIRTUAL 0x02
#define KEYBOARD_AUTORELEASE 0x04
#define KEYBOARD_IGNOREMODIFIERS 0x0
#define KEYBOARD_SOURCE_MASK (KEYBOARD_HARDWARE | KEYBOARD_AUTORELEASE)
#define KEYCODE_OPTION_APPLY_MODIFIERS 0x01
#define KEYCODE_OPTION_FRENCH_NUMBERS 0x02
#define KEYCODE_OPTION_LATIN_LETTERS 0x04
#define DEFAULT_KEYCODE_OPTIONS (KEYCODE_OPTION_APPLY_MODIFIERS | KEYCODE_OPTION_FRENCH_NUMBERS)
typedef struct SDL_KeyboardInstance
{
SDL_KeyboardID instance_id;
@ -54,6 +56,9 @@ typedef struct SDL_Keyboard
Uint8 keysource[SDL_NUM_SCANCODES];
Uint8 keystate[SDL_NUM_SCANCODES];
SDL_Keymap *keymap;
SDL_bool french_numbers;
SDL_bool non_latin_letters;
Uint32 keycode_options;
SDL_bool autorelease_pending;
Uint64 hardware_timestamp;
} SDL_Keyboard;
@ -62,9 +67,33 @@ static SDL_Keyboard SDL_keyboard;
static int SDL_keyboard_count;
static SDL_KeyboardInstance *SDL_keyboards;
static void SDLCALL SDL_KeycodeOptionsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_Keyboard *keyboard = (SDL_Keyboard *)userdata;
if (hint && *hint) {
keyboard->keycode_options = 0;
if (SDL_strstr(hint, "unmodified")) {
keyboard->keycode_options &= ~KEYCODE_OPTION_APPLY_MODIFIERS;
} else if (SDL_strstr(hint, "modified")) {
keyboard->keycode_options |= KEYCODE_OPTION_APPLY_MODIFIERS;
}
if (SDL_strstr(hint, "french_numbers")) {
keyboard->keycode_options |= KEYCODE_OPTION_FRENCH_NUMBERS;
}
if (SDL_strstr(hint, "latin_letters")) {
keyboard->keycode_options |= KEYCODE_OPTION_LATIN_LETTERS;
}
} else {
keyboard->keycode_options = DEFAULT_KEYCODE_OPTIONS;
}
}
/* Public functions */
int SDL_InitKeyboard(void)
{
SDL_AddHintCallback(SDL_HINT_KEYCODE_OPTIONS,
SDL_KeycodeOptionsChanged, &SDL_keyboard);
return 0;
}
@ -205,6 +234,25 @@ void SDL_SetKeymap(SDL_Keymap *keymap, SDL_bool send_event)
keyboard->keymap = keymap;
// Detect French number row (all symbols)
keyboard->french_numbers = SDL_TRUE;
for (int i = SDL_SCANCODE_1; i <= SDL_SCANCODE_0; ++i) {
if (SDL_isdigit(SDL_GetKeymapKeycode(keymap, (SDL_Scancode)i, SDL_KMOD_NONE)) ||
!SDL_isdigit(SDL_GetKeymapKeycode(keymap, (SDL_Scancode)i, SDL_KMOD_SHIFT))) {
keyboard->french_numbers = SDL_FALSE;
break;
}
}
// Detect non-Latin keymap
keyboard->non_latin_letters = SDL_TRUE;
for (int i = SDL_SCANCODE_A; i <= SDL_SCANCODE_D; ++i) {
if (SDL_GetKeymapKeycode(keymap, (SDL_Scancode)i, SDL_KMOD_NONE) <= 0xFF) {
keyboard->non_latin_letters = SDL_FALSE;
break;
}
}
if (send_event) {
SDL_SendKeymapChangedEvent();
}
@ -276,6 +324,40 @@ int SDL_SetKeyboardFocus(SDL_Window *window)
return 0;
}
static SDL_Keycode SDL_GetEventKeycode(SDL_Keyboard *keyboard, SDL_Scancode scancode, SDL_Keymod modstate)
{
SDL_Keycode keycode;
if (scancode >= SDL_SCANCODE_A && scancode <= SDL_SCANCODE_Z) {
if (keyboard->non_latin_letters && (keyboard->keycode_options & KEYCODE_OPTION_LATIN_LETTERS)) {
if (keyboard->keycode_options & KEYCODE_OPTION_APPLY_MODIFIERS) {
keycode = SDL_GetDefaultKeyFromScancode(scancode, modstate);
} else {
keycode = SDL_GetDefaultKeyFromScancode(scancode, SDL_KMOD_NONE);
}
return keycode;
}
}
if (scancode >= SDL_SCANCODE_1 && scancode <= SDL_SCANCODE_0) {
if (keyboard->french_numbers && (keyboard->keycode_options & KEYCODE_OPTION_FRENCH_NUMBERS)) {
// Invert the shift state to generate the correct keycode
if (modstate & SDL_KMOD_SHIFT) {
modstate &= ~SDL_KMOD_SHIFT;
} else {
modstate |= SDL_KMOD_SHIFT;
}
}
}
if (keyboard->keycode_options & KEYCODE_OPTION_APPLY_MODIFIERS) {
keycode = SDL_GetKeyFromScancode(scancode, modstate);
} else {
keycode = SDL_GetKeyFromScancode(scancode, SDL_KMOD_NONE);
}
return keycode;
}
static int SDL_SendKeyboardKeyInternal(Uint64 timestamp, Uint32 flags, SDL_KeyboardID keyboardID, int rawcode, SDL_Scancode scancode, SDL_Keycode keycode, Uint8 state)
{
SDL_Keyboard *keyboard = &SDL_keyboard;
@ -325,7 +407,7 @@ static int SDL_SendKeyboardKeyInternal(Uint64 timestamp, Uint32 flags, SDL_Keybo
keyboard->keystate[scancode] = state;
if (keycode == SDLK_UNKNOWN) {
keycode = SDL_GetKeyFromScancode(scancode, SDL_KMOD_NONE);
keycode = SDL_GetEventKeycode(keyboard, scancode, keyboard->modstate);
}
} else if (keycode == SDLK_UNKNOWN && rawcode == 0) {
@ -589,6 +671,9 @@ void SDL_QuitKeyboard(void)
SDL_DestroyKeymap(SDL_keyboard.keymap);
SDL_keyboard.keymap = NULL;
}
SDL_DelHintCallback(SDL_HINT_KEYCODE_OPTIONS,
SDL_KeycodeOptionsChanged, &SDL_keyboard);
}
const Uint8 *SDL_GetKeyboardState(int *numkeys)