Hi,
Newbie question.
Description
I would like to change de button image of a window, for learning reasons only.
ie: when i press(toggle) the button, the image change from “LV_SYMBOL_POWER” to “LV_SYMBOL_CLOSE”.
If i use a “global/local” variable like “lv_obj_t * win_btn” and i assign “lv_win_add_btn()” function, others buttons are created(added, function name) side by side the original button.
Probably i can only do that with a common button ?!
What MCU/Processor/Board and compiler are you using?
Esp32.
What do you want to achieve?
Change the image of win button after button pressed(button image toggle).
Code to reproduce
/**
* @file terminal.c
*
*/
/*********************
* INCLUDES
*********************/
#include "terminal.h"
#if LV_USE_TERMINAL
/*********************
* DEFINES
*********************/
#define TERMINAL_ANIM_TIME 100 /*[ms]*/
#define TERMINAL_NO_INPUT 0 /*Do not create Text area and Keyboard*/
#define TERMINAL_LOG_LENGTH 512 /*Characters*/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void clr_event_cb(lv_obj_t * btn, lv_event_t event);
static void win_close_action(lv_obj_t * btn, lv_event_t event);
/**********************
* STATIC VARIABLES
**********************/
static lv_obj_t * win;
static char txt_log[TERMINAL_LOG_LENGTH + 1];
static lv_obj_t * label;
static lv_obj_t * clr_btn;
static lv_obj_t * win_btn;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Open a terminal
* @return pointer to the terminal window
*/
lv_obj_t * terminal_create(void)
{
static lv_style_t style_bg;
lv_style_copy(&style_bg, &lv_style_pretty);
style_bg.body.main_color = lv_color_make(0x30, 0x30, 0x30);
style_bg.body.grad_color = lv_color_make(0x30, 0x30, 0x30);
style_bg.body.border.color = LV_COLOR_WHITE;
style_bg.text.color = lv_color_make(0xE0, 0xE0, 0xE0);
lv_coord_t hres = lv_disp_get_hor_res(NULL);
lv_coord_t vres = lv_disp_get_ver_res(NULL);
**win = lv_win_create(lv_disp_get_scr_act(NULL), NULL);**
** lv_win_set_style(win, LV_WIN_STYLE_BG, &style_bg);**
** lv_obj_set_size(win, hres, vres);**
** lv_win_set_sb_mode(win, LV_SB_MODE_AUTO);**
** lv_win_set_title(win, "Xunda");**
** //lv_obj_t * **
** win_btn = lv_win_add_btn(win, LV_SYMBOL_POWER); // LV_SYMBOL_CLOSE**
** lv_obj_set_event_cb(win_btn, win_close_action);**
** /*Make the window's content responsive*/**
** lv_win_set_layout(win, LV_LAYOUT_PRETTY);**
/*Create a label for the text of the terminal*/
label = lv_label_create(win, NULL);
lv_label_set_long_mode(label, LV_LABEL_LONG_BREAK);
lv_obj_set_width(label, lv_win_get_width(win));
lv_label_set_static_text(label, txt_log); /*Use the text array directly*/
/*Create a clear button*/
clr_btn = lv_btn_create(win, NULL);
lv_btn_set_fit(clr_btn, LV_FIT_TIGHT);
lv_obj_set_event_cb(clr_btn, clr_event_cb);
lv_obj_t * btn_label = lv_label_create(clr_btn, NULL);
lv_label_set_text(btn_label, "Clear");
return win;
}
/**
* Add data to the terminal
* @param txt_in character sting to add to the terminal
*/
void terminal_add(const char * txt_in)
{
if(win == NULL) return; /*Check if the window is exists*/
uint16_t txt_len = strlen(txt_in);
uint16_t old_len = strlen(txt_log);
/*If the data is longer then the terminal ax size show the last part of data*/
if(txt_len > TERMINAL_LOG_LENGTH) {
txt_in += (txt_len - TERMINAL_LOG_LENGTH);
txt_len = TERMINAL_LOG_LENGTH;
old_len = 0;
}
/*If the text become too long 'forget' the oldest lines*/
else if(old_len + txt_len > TERMINAL_LOG_LENGTH) {
uint16_t new_start;
for(new_start = 0; new_start < old_len; new_start++) {
if(txt_log[new_start] == '\n') {
/*If there is enough space break*/
if(new_start >= txt_len) {
/*Ignore line breaks*/
while(txt_log[new_start] == '\n' || txt_log[new_start] == '\r') new_start++;
break;
}
}
}
/* If it wasn't able to make enough space on line breaks
* simply forget the oldest characters*/
if(new_start == old_len) {
new_start = old_len - (TERMINAL_LOG_LENGTH - txt_len);
}
/*Move the remaining text to the beginning*/
uint16_t j;
for(j = new_start; j < old_len; j++) {
txt_log[j - new_start] = txt_log[j];
}
old_len = old_len - new_start;
txt_log[old_len] = '\0';
}
memcpy(&txt_log[old_len], txt_in, txt_len);
txt_log[old_len + txt_len] = '\0';
lv_label_set_static_text(label, txt_log);
lv_win_focus(win, clr_btn, TERMINAL_ANIM_TIME);
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Called when the Clear button is click to clear the text of the terminal
* @param btn pointer to the clear button
* @param event the current event
*/
static void clr_event_cb(lv_obj_t * btn, lv_event_t event)
{
(void) btn; /*Unused*/
if(event != LV_EVENT_CLICKED) return;
txt_log[0] = '\0';
lv_label_set_static_text(label, txt_log); /*Refresh the text*/
}
/**
* Called when the window's close button is clicked
* @param btn pointer to the close button
* @return LV_ACTION_RES_INV because the button is deleted in the function
*/
static void win_close_action(lv_obj_t * btn, lv_event_t event)
{
(void) btn; /*Unused*/
if(event != LV_EVENT_CLICKED) return;
//lv_obj_del(win);
//win = NULL;
static bool f = 0;
f = !f;
if(f)
win_btn = lv_win_add_btn(win, LV_SYMBOL_CLOSE);
else
win_btn = lv_win_add_btn(win, LV_SYMBOL_POWER);
}
#endif /*LV_USE_TERMINAL*/
