Update Label.
Newest Master.
I use an ESP32 with an 2.8 zoll dp over spi
And the Arduino IDE
What I Found
Docu link:
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Github issues.
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Forum Link:
I cant use Links…
Description
I cant Update the label. i found 3 ways. and i want to use the way with tasks.
the solution with tasks from docu:
#include "../../../lv_examples.h"
#if LV_USE_LABEL
static void text_changer(lv_task_t * t);
lv_obj_t * labels[3];
/**
* Create three labels to demonstrate the alignments.
*/
void lv_ex_label_3(void)
{
/*`lv_label_set_align` is not required to align the object itslef.
* It's used only when the text has multiple lines*/
/* Create a label on the top.
* No additional alignment so it will be the reference*/
labels[0] = lv_label_create(lv_scr_act(), NULL);
lv_obj_align(labels[0], NULL, LV_ALIGN_IN_TOP_MID, 0, 5);
lv_label_set_align(labels[0], LV_LABEL_ALIGN_CENTER);
/* Create a label in the middle.
* `lv_obj_align` will be called every time the text changes
* to keep the middle position */
labels[1] = lv_label_create(lv_scr_act(), NULL);
lv_obj_align(labels[1], NULL, LV_ALIGN_CENTER, 0, 0);
lv_label_set_align(labels[1], LV_LABEL_ALIGN_CENTER);
/* Create a label in the bottom.
* Enable auto realign. */
labels[2] = lv_label_create(lv_scr_act(), NULL);
lv_obj_set_auto_realign(labels[2], true);
lv_obj_align(labels[2], NULL, LV_ALIGN_IN_BOTTOM_MID, 0, -5);
lv_label_set_align(labels[2], LV_LABEL_ALIGN_CENTER);
lv_task_t * t = lv_task_create(text_changer, 1000, LV_TASK_PRIO_MID, NULL);
lv_task_ready(t);
}
static void text_changer(lv_task_t * t)
{
const char * texts[] = {"Text", "A very long text", "A text with\nmultiple\nlines", NULL};
static uint8_t i = 0;
lv_label_set_text(labels[0], texts[i]);
lv_label_set_text(labels[1], texts[i]);
lv_label_set_text(labels[2], texts[i]);
/*Manually realaign `labels[1]`*/
lv_obj_align(labels[1], NULL, LV_ALIGN_CENTER, 0, 0);
i++;
if(texts[i] == NULL) i = 0;
}
#endif`
the second solution is:
- set an event function for the label
- In
LV_EVENT_REFRESHset the text as you need by using the variables you need - Send an
LV_EVENT_REFRESHmanually withlv_event_send(label, LV_EVENT_REFRESH, NULL);when the label needs to be refreshed
and the third: (but i dont now to use it correctly)
int my_val = <whatever>;
lv_label_set_text_fmt(label, "%d", my_val);
What do you want to achieve?
Updating Time on the Interface.
What have you tried so far?
void loop(void) {
lv_task_handler(); /* let the GUI do its work */
delay(5);
}
void my_task(lv_task_t * task);
void lv_mainmenu(void)
{
lv_obj_clean(lv_scr_act());
lv_obj_t * cont1mainmenu = lv_cont_create(lv_scr_act(), NULL);
lv_obj_set_height(cont1mainmenu, 0.10 * dphigh); // set height
lv_cont_set_fit2(cont1mainmenu, LV_FIT_MAX,0);
lv_obj_align(cont1mainmenu, NULL, LV_ALIGN_IN_TOP_MID, 0, 0);
lv_obj_t * ltimemainmenu;
ltimemainmenu = lv_label_create(cont1mainmenu, NULL);
lv_label_set_text(ltimemainmenu, timePrint("%H:%M", 6).c_str());
lv_task_t * task = lv_task_create(my_task, 10, LV_TASK_PRIO_LOWEST, NULL);
lv_task_ready(task);
}
lv_obj_t * ltimemainmenu;
void my_task(lv_task_t * task)
{
Serial.println(timePrint("%H:%M:%S", 10) + " : ltest");
lv_label_set_text(ltimemainmenu, timePrint("%H:%M", 6).c_str());
}
If i use 0 ms period the touch is working but my_task came only one time.
if i use more then 1 ms is the same issue but without working touch.
