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/**
* @file lv_sdl_keyboard.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_sdl_keyboard.h"
#if LV_USE_SDL
#include "../../indev/lv_indev.h"
#include "../../core/lv_group.h"
#include "../../stdlib/lv_string.h"
#include LV_SDL_INCLUDE_PATH
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
typedef struct {
char buf[KEYBOARD_BUFFER_SIZE];
bool dummy_read;
} lv_sdl_keyboard_t;
/**********************
* STATIC PROTOTYPES
**********************/
static void sdl_keyboard_read(lv_indev_t * indev, lv_indev_data_t * data);
static uint32_t keycode_to_ctrl_key(SDL_Keycode sdl_key);
static void release_indev_cb(lv_event_t * e);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_indev_t * lv_sdl_keyboard_create(void)
{
lv_sdl_keyboard_t * dsc = lv_malloc_zeroed(sizeof(lv_sdl_keyboard_t));
LV_ASSERT_MALLOC(dsc);
if(dsc == NULL) return NULL;
lv_indev_t * indev = lv_indev_create();
LV_ASSERT_MALLOC(indev);
if(indev == NULL) {
lv_free(dsc);
return NULL;
}
lv_indev_set_type(indev, LV_INDEV_TYPE_KEYPAD);
lv_indev_set_read_cb(indev, sdl_keyboard_read);
lv_indev_set_driver_data(indev, dsc);
lv_indev_set_mode(indev, LV_INDEV_MODE_EVENT);
lv_indev_add_event_cb(indev, release_indev_cb, LV_EVENT_DELETE, indev);
return indev;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void sdl_keyboard_read(lv_indev_t * indev, lv_indev_data_t * data)
{
lv_sdl_keyboard_t * dev = lv_indev_get_driver_data(indev);
const size_t len = lv_strlen(dev->buf);
/*Send a release manually*/
if(dev->dummy_read) {
dev->dummy_read = false;
data->state = LV_INDEV_STATE_RELEASED;
}
/*Send the pressed character*/
else if(len > 0) {
dev->dummy_read = true;
data->state = LV_INDEV_STATE_PRESSED;
data->key = dev->buf[0];
memmove(dev->buf, dev->buf + 1, len);
}
}
static void release_indev_cb(lv_event_t * e)
{
lv_indev_t * indev = (lv_indev_t *) lv_event_get_user_data(e);
lv_sdl_keyboard_t * dev = lv_indev_get_driver_data(indev);
if(dev) {
lv_indev_set_driver_data(indev, NULL);
lv_indev_set_read_cb(indev, NULL);
lv_free(dev);
LV_LOG_INFO("done");
}
}
void _lv_sdl_keyboard_handler(SDL_Event * event)
{
uint32_t win_id = UINT32_MAX;
switch(event->type) {
case SDL_KEYDOWN:
win_id = event->key.windowID;
break;
case SDL_TEXTINPUT:
win_id = event->text.windowID;
break;
default:
return;
}
lv_display_t * disp = _lv_sdl_get_disp_from_win_id(win_id);
/*Find a suitable indev*/
lv_indev_t * indev = lv_indev_get_next(NULL);
while(indev) {
if(lv_indev_get_display(indev) == disp && lv_indev_get_type(indev) == LV_INDEV_TYPE_KEYPAD) {
break;
}
indev = lv_indev_get_next(indev);
}
if(indev == NULL) return;
lv_sdl_keyboard_t * dsc = lv_indev_get_driver_data(indev);
/* We only care about SDL_KEYDOWN and SDL_TEXTINPUT events */
switch(event->type) {
case SDL_KEYDOWN: { /*Button press*/
const uint32_t ctrl_key = keycode_to_ctrl_key(event->key.keysym.sym);
if(ctrl_key == '\0')
return;
const size_t len = lv_strlen(dsc->buf);
if(len < KEYBOARD_BUFFER_SIZE - 1) {
dsc->buf[len] = ctrl_key;
dsc->buf[len + 1] = '\0';
}
break;
}
case SDL_TEXTINPUT: { /*Text input*/
const size_t len = lv_strlen(dsc->buf) + lv_strlen(event->text.text);
if(len < KEYBOARD_BUFFER_SIZE - 1)
strcat(dsc->buf, event->text.text);
}
break;
default:
break;
}
size_t len = lv_strlen(dsc->buf);
while(len) {
lv_indev_read(indev);
/*Call again to handle dummy read in `sdl_keyboard_read`*/
lv_indev_read(indev);
len--;
}
}
/**
* Convert a SDL key code to it's LV_KEY_* counterpart or return '\0' if it's not a control character.
* @param sdl_key the key code
* @return LV_KEY_* control character or '\0'
*/
static uint32_t keycode_to_ctrl_key(SDL_Keycode sdl_key)
{
/*Remap some key to LV_KEY_... to manage groups*/
switch(sdl_key) {
case SDLK_RIGHT:
case SDLK_KP_PLUS:
return LV_KEY_RIGHT;
case SDLK_LEFT:
case SDLK_KP_MINUS:
return LV_KEY_LEFT;
case SDLK_UP:
return LV_KEY_UP;
case SDLK_DOWN:
return LV_KEY_DOWN;
case SDLK_ESCAPE:
return LV_KEY_ESC;
case SDLK_BACKSPACE:
return LV_KEY_BACKSPACE;
case SDLK_DELETE:
return LV_KEY_DEL;
case SDLK_KP_ENTER:
case '\r':
return LV_KEY_ENTER;
case SDLK_TAB:
case SDLK_PAGEDOWN:
return LV_KEY_NEXT;
case SDLK_PAGEUP:
return LV_KEY_PREV;
case SDLK_HOME:
return LV_KEY_HOME;
case SDLK_END:
return LV_KEY_END;
default:
return '\0';
}
}
#endif /*LV_USE_SDL*/
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