[lvgl] Fix text component (#7563)

esphome/components/lvgl/text/__init__.py

@@ -34,13 +34,13 @@ async def to_code(config):
     widget = widget[0]
     await wait_for_widgets()
     async with LambdaContext([(cg.std_string, "text_value")]) as control:
-        await widget.set_property("text", "text_value.c_str())")
-        lv.event_send(widget.obj, API_EVENT, None)
+        await widget.set_property("text", "text_value.c_str()")
+        lv.event_send(widget.obj, API_EVENT, cg.nullptr)
         control.add(textvar.publish_state(widget.get_value()))
     async with LambdaContext(EVENT_ARG) as lamb:
         lv_add(textvar.publish_state(widget.get_value()))
     async with LvContext(paren):
-        widget.var.set_control_lambda(await control.get_lambda())
+        lv_add(textvar.set_control_lambda(await control.get_lambda()))
         lv_add(
             paren.add_event_cb(
                 widget.obj,

tests/components/lvgl/common.yaml

@@ -135,3 +135,9 @@ wifi:
 time:
   platform: sntp
   id: time_id
+
+text:
+  - id: lvgl_text
+    platform: lvgl
+    widget: hello_label
+    mode: text

tests/components/lvgl/lvgl-package.yaml

@@ -151,6 +151,10 @@ lvgl:
             align: center
             text_font: montserrat_40
             border_post: true
+            on_press:
+              lvgl.label.update:
+                id: hello_label
+                text: Goodbye
             on_click:
               then:
                 - lvgl.animimg.stop: anim_img