wasm-micro-runtime/samples/simple/wasm-apps/gui_lvgl_compatible.c

/*
 * Copyright (C) 2019 Intel Corporation.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdlib.h>
#include <unistd.h>
#include "wasm_app.h"
#include "lvgl.h"

extern char g_widget_text[];

static void btn_event_cb(lv_obj_t *btn, lv_event_t event);

uint32_t count = 0;
char count_str[11] = { 0 };
lv_obj_t *hello_world_label;
lv_obj_t *count_label;
lv_obj_t *btn1;
lv_obj_t *label_count1;
int label_count1_value = 100;
char label_count1_str[11] = { 0 };

void timer1_update(user_timer_t timer1)
{
    if ((count % 100) == 0) {
        sprintf(count_str, "%d", count / 100);
        lv_label_set_text(count_label, count_str);
    }
    ++count;
}

void on_init()
{
    char *text;

    hello_world_label = lv_label_create(NULL, NULL);
    lv_label_set_text(hello_world_label, "Hello world!");
    text = lv_label_get_text(hello_world_label);
    printf("Label text %lu %s \n", strlen(text), text);
    lv_obj_align(hello_world_label, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);

    count_label = lv_label_create(NULL, NULL);
    lv_obj_align(count_label, NULL, LV_ALIGN_IN_TOP_MID, 0, 0);

    btn1 = lv_btn_create(NULL, NULL); /*Create a button on the currently loaded screen*/
    lv_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, 0); /*Align below the label*/

    /*Create a label on the button*/
    lv_obj_t *btn_label = lv_label_create(btn1, NULL);
    lv_label_set_text(btn_label, "Click --");

    label_count1 = lv_label_create(NULL, NULL);
    lv_label_set_text(label_count1, "100");
    lv_obj_align(label_count1, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);

    /* set up a timer */
    user_timer_t timer;
    timer = api_timer_create(10, true, false, timer1_update);
    api_timer_restart(timer, 10);
}

static void btn_event_cb(lv_obj_t *btn, lv_event_t event)
{
    if(event == LV_EVENT_RELEASED) {
        label_count1_value--;
        sprintf(label_count1_str, "%d", label_count1_value);
        lv_label_set_text(label_count1, label_count1_str);
        if (label_count1_value == 0)
            label_count1_value = 100;
    }
}