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Description
LVGL version
9.3.0
Platform
STM32MPU135F-DK with OpenSTLinux
LVGL with SDL2
What happened?
The documentation says that:
LV_EVENT_VALUE_CHANGED Sent when a new tab is selected by sliding or clicking the tab button.
But that event never seems to occur when a tab is pressed
How to reproduce?
Here is a program that I would expect to work. It works if I use LV_EVENT_ALL instead of LV_EVENT_VALUE_CHANGED.
#include <stdint.h>
#include <pthread.h>
#include <unistd.h>
#include <signal.h>
#include "lvgl/lvgl.h"
#include "lvgl/src/drivers/sdl/lv_sdl_mouse.h"
#define H_RES (480)
#define V_RES (272)
#define LVGL_DESIRED_TICK_INCREASE_MS 5
#define MICROSECOND_TO_MILISECOND_RATE 1000
/* lvgl stuff and threats */
static lv_display_t *disp;
static lv_indev_t *lvMouse;
static pthread_t tickThread;
static void* tick_thread(void* data);
volatile sig_atomic_t stop = 0; /* programms runs as long as this is set */
/* callbacks */
void tab_view_value_changed_cb(lv_event_t *e);
uint32_t u32Temp;
int main(){
lv_init();
pthread_create( &tickThread, NULL, tick_thread,NULL);
disp = lv_sdl_window_create(H_RES, V_RES);
lvMouse = lv_sdl_mouse_create();
lv_obj_t *screen = lv_obj_create(NULL);
lv_obj_t *tabView = lv_tabview_create(screen);
lv_obj_t *tabHome = lv_tabview_add_tab(tabView, "Home");
lv_obj_t *tabExit = lv_tabview_add_tab(tabView, "Exit");
u32Temp = lv_obj_get_index(tabExit);
lv_obj_add_event_cb(tabView,tab_view_value_changed_cb,LV_EVENT_VALUE_CHANGED, &u32Temp);
lv_screen_load_anim(screen,LV_SCR_LOAD_ANIM_NONE,0,0,true);
while(!stop){
uint32_t timeTillNext = lv_timer_handler();
usleep(timeTillNext*MICROSECOND_TO_MILISECOND_RATE );
}
pthread_join(tickThread,NULL);
lv_indev_delete(lvMouse);
lv_disp_remove(disp);
lv_sdl_quit();
lv_deinit();
}
/* callbacks */
void tab_view_value_changed_cb(lv_event_t *e){
lv_obj_t *tabView = lv_event_get_target_obj(e);
int32_t exitTabId = *((int32_t*)lv_event_get_user_data(e));
if (lv_tabview_get_tab_active(tabView) == exitTabId)
stop = 1;
}
/* other functions */
static void *tick_thread(void* data) {
(void) data;
while(!stop) {
usleep(LVGL_DESIRED_TICK_INCREASE_MS * MICROSECOND_TO_MILISECOND_RATE);
lv_tick_inc(LVGL_DESIRED_TICK_INCREASE_MS);
}
}Metadata
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