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fix(examples): fix infinite scroll crash (#7459)

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Liam 2024-12-18 03:28:18 -05:00 committed by GitHub
parent 64e01e5248
commit bb54fc50c2
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1 changed files with 12 additions and 9 deletions
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21
examples/scroll/lv_example_scroll_7.c
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@ -5,6 +5,7 @@ static lv_obj_t * high_label;
static lv_obj_t * low_label; static lv_obj_t * low_label;
static int32_t top_num; static int32_t top_num;
static int32_t bottom_num; static int32_t bottom_num;
static bool update_scroll_running = false;
static lv_obj_t * load_item(lv_obj_t * parent, int32_t num) static lv_obj_t * load_item(lv_obj_t * parent, int32_t num)
{ {
@ -17,6 +18,12 @@ static lv_obj_t * load_item(lv_obj_t * parent, int32_t num)
static void update_scroll(lv_obj_t * obj) static void update_scroll(lv_obj_t * obj)
{ {
/* do not re-enter this function when `lv_obj_scroll_by`
* triggers this callback again.
*/
if(update_scroll_running) return;
update_scroll_running = true;
int32_t top_num_original = top_num; int32_t top_num_original = top_num;
int32_t bottom_num_original = bottom_num; int32_t bottom_num_original = bottom_num;
@ -63,6 +70,8 @@ static void update_scroll(lv_obj_t * obj)
if(bottom_num != bottom_num_original) { if(bottom_num != bottom_num_original) {
lv_label_set_text_fmt(low_label, "current smallest\nloaded value:\n%"PRId32, bottom_num); lv_label_set_text_fmt(low_label, "current smallest\nloaded value:\n%"PRId32, bottom_num);
} }
update_scroll_running = false;
} }
static void scroll_cb(lv_event_t * e) static void scroll_cb(lv_event_t * e)
@ -104,16 +113,10 @@ void lv_example_scroll_7(void)
lv_label_set_text_static(low_label, "current smallest\nloaded value:"); lv_label_set_text_static(low_label, "current smallest\nloaded value:");
lv_obj_align(low_label, LV_ALIGN_BOTTOM_LEFT, 10, -10); lv_obj_align(low_label, LV_ALIGN_BOTTOM_LEFT, 10, -10);
/* These counters hold the the highest/lowest number currently shown. load_item(obj, 3);
* Since no numbers are show yet, set them such that they will be /* These counters hold the the highest/lowest number currently loaded. */
* correct after the first value is added.
* I.e., if a value is added at the top, `top_num` will be incremented
* and its new value (4) will be added to the top (`top_num`=4, `bottom_num`=4).
* If a value is added to the bottom, `bottom_num` will be decremented
* and its new value (3) will be added to the bottom (`top_num`=3, `bottom_num`=3).
*/
top_num = 3; top_num = 3;
bottom_num = 4; bottom_num = 3;
lv_obj_update_layout(obj); lv_obj_update_layout(obj);
update_scroll(obj); update_scroll(obj);