update asserts

examples/widgets/checkbox/lv_example_checkbox_1.c

@@ -0,0 +1,44 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_CHECKBOX
+
+static void event_handler(lv_obj_t * obj, lv_event_t event)
+{
+    if(event == LV_EVENT_VALUE_CHANGED) {
+        const char * txt = lv_checkbox_get_text(obj);
+        const char * state = lv_obj_get_state(obj) & LV_STATE_CHECKED ? "Checked" : "Unchecked";
+        printf("%s: %s\n", txt, state);
+    }
+}
+
+void lv_example_checkbox_1(void)
+{
+    static lv_flex_t flex_center;
+    lv_flex_init(&flex_center);
+    lv_flex_set_flow(&flex_center, LV_FLEX_FLOW_COLUMN);
+    lv_flex_set_place(&flex_center, LV_FLEX_PLACE_CENTER, LV_FLEX_PLACE_START, LV_FLEX_PLACE_CENTER);
+
+    lv_obj_set_layout(lv_scr_act(), &flex_center);
+
+    lv_obj_t * cb;
+    cb = lv_checkbox_create(lv_scr_act(), NULL);
+    lv_checkbox_set_text(cb, "Apple");
+    lv_obj_add_event_cb(cb, event_handler, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act(), NULL);
+    lv_checkbox_set_text(cb, "Banana");
+    lv_obj_add_state(cb, LV_STATE_CHECKED);
+    lv_obj_add_event_cb(cb, event_handler, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act(), NULL);
+    lv_checkbox_set_text(cb, "Lemon");
+    lv_obj_add_state(cb, LV_STATE_DISABLED);
+    lv_obj_add_event_cb(cb, event_handler, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act(), NULL);
+    lv_obj_add_state(cb, LV_STATE_CHECKED | LV_STATE_DISABLED);
+    lv_checkbox_set_text(cb, "Melon");
+    lv_obj_add_event_cb(cb, event_handler, NULL);
+}
+
+#endif