add lv_components as src/extra and minor fixes

examples/widgets/checkbox/index.rst

@@ -0,0 +1,12 @@
+C
+^
+
+Simple Checkbox
+""""""""""""""""
+.. lv_example:: lv_ex_widgets/lv_ex_checkbox/lv_ex_checkbox_1
+  :language: c
+
+MicroPython
+^^^^^^^^^^^
+
+No examples yet.

examples/widgets/checkbox/lv_checkbox_example_1.c

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+#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_ex_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

examples/widgets/checkbox/lv_checkbox_example_1.py

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+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        print("State: %s" % ("Checked" if obj.is_checked() else "Unchecked"))
+
+cb = lv.cb(lv.scr_act())
+cb.set_text("I agree to terms and conditions.")
+cb.align(None, lv.ALIGN.CENTER, 0, 0)
+cb.set_event_cb(event_handler)