[lvgl] Bug fixes (#7338)

esphome/components/lvgl/automation.py

@@ -5,6 +5,7 @@ from esphome import automation
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.const import CONF_ID, CONF_TIMEOUT
+from esphome.cpp_generator import RawExpression
 from esphome.cpp_types import nullptr
 
 from .defines import (
@@ -26,6 +27,7 @@ from .lvcode import (
     add_line_marks,
     lv,
     lv_add,
+    lv_expr,
     lv_obj,
     lvgl_comp,
 )
@@ -38,7 +40,13 @@ from .types import (
     lv_disp_t,
     lv_obj_t,
 )
-from .widgets import Widget, get_widgets, lv_scr_act, set_obj_properties
+from .widgets import (
+    Widget,
+    get_widgets,
+    lv_scr_act,
+    set_obj_properties,
+    wait_for_widgets,
+)
 
 
 async def action_to_code(
@@ -48,10 +56,12 @@ async def action_to_code(
     template_arg,
     args,
 ):
+    await wait_for_widgets()
     async with LambdaContext(parameters=args, where=action_id) as context:
+        with LvConditional(lv_expr.is_pre_initialise()):
+            context.add(RawExpression("return"))
         for widget in widgets:
-            with LvConditional(widget.obj != nullptr):
+            await action(widget)
-                await action(widget)
     var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
     return var
 

esphome/components/lvgl/lvgl_esphome.cpp

@@ -294,6 +294,13 @@ void LvglComponent::loop() {
   }
   lv_timer_handler_run_in_period(5);
 }
+bool lv_is_pre_initialise() {
+  if (!lv_is_initialized()) {
+    ESP_LOGE(TAG, "LVGL call before component is initialised");
+    return true;
+  }
+  return false;
+}
 
 #ifdef USE_LVGL_IMAGE
 lv_img_dsc_t *lv_img_from(image::Image *src, lv_img_dsc_t *img_dsc) {

esphome/components/lvgl/lvgl_esphome.h

@@ -40,6 +40,7 @@ namespace lvgl {
 
 extern lv_event_code_t lv_api_event;     // NOLINT
 extern lv_event_code_t lv_update_event;  // NOLINT
+extern bool lv_is_pre_initialise();
 #ifdef USE_LVGL_COLOR
 inline lv_color_t lv_color_from(Color color) { return lv_color_make(color.red, color.green, color.blue); }
 #endif  // USE_LVGL_COLOR

esphome/components/lvgl/widgets/__init__.py

@@ -1,3 +1,4 @@
+import asyncio
 import sys
 from typing import Any, Union
 
@@ -223,6 +224,11 @@ async def get_widget_(wid: Widget):
     return await FakeAwaitable(get_widget_generator(wid))
 
 
+async def wait_for_widgets():
+    while not Widget.widgets_completed:
+        await asyncio.sleep(0)
+
+
 async def get_widgets(config: Union[dict, list], id: str = CONF_ID) -> list[Widget]:
     if not config:
         return []

esphome/components/lvgl/widgets/line.py

@@ -3,7 +3,7 @@ import functools
 import esphome.codegen as cg
 import esphome.config_validation as cv
 
-from ..defines import CONF_MAIN, literal
+from ..defines import CONF_MAIN
 from ..lvcode import lv
 from ..types import LvType
 from . import Widget, WidgetType
@@ -38,13 +38,15 @@ LINE_SCHEMA = {
 
 class LineType(WidgetType):
     def __init__(self):
-        super().__init__(CONF_LINE, LvType("lv_line_t"), (CONF_MAIN,), LINE_SCHEMA)
+        super().__init__(
+            CONF_LINE, LvType("lv_line_t"), (CONF_MAIN,), LINE_SCHEMA, modify_schema={}
+        )
 
     async def to_code(self, w: Widget, config):
         """For a line object, create and add the points"""
-        data = literal(config[CONF_POINTS])
+        if data := config.get(CONF_POINTS):
-        points = cg.static_const_array(config[CONF_POINT_LIST_ID], data)
+            points = cg.static_const_array(config[CONF_POINT_LIST_ID], data)
-        lv.line_set_points(w.obj, points, len(data))
+            lv.line_set_points(w.obj, points, len(data))
 
 
 line_spec = LineType()

esphome/components/lvgl/widgets/msgbox.py

@@ -13,7 +13,7 @@ from ..defines import (
     TYPE_FLEX,
     literal,
 )
-from ..helpers import add_lv_use
+from ..helpers import add_lv_use, lvgl_components_required
 from ..lv_validation import lv_bool, lv_pct, lv_text
 from ..lvcode import (
     EVENT_ARG,
@@ -72,6 +72,7 @@ async def msgbox_to_code(conf):
         *buttonmatrix_spec.get_uses(),
         *button_spec.get_uses(),
     )
+    lvgl_components_required.add("BUTTONMATRIX")
     messagebox_id = conf[CONF_ID]
     outer = lv_Pvariable(lv_obj_t, messagebox_id.id)
     buttonmatrix = new_Pvariable(

tests/components/lvgl/lvgl-package.yaml

@@ -379,6 +379,7 @@ lvgl:
                     format: "bar value %f"
                     args: [x]
         - line:
+            id: lv_line_id
             align: center
             points:
               - 5, 5
@@ -387,7 +388,10 @@ lvgl:
               - 180, 60
               - 240, 10
             on_click:
-              lvgl.page.next:
+              - lvgl.widget.update:
+                  id: lv_line_id
+                  line_color: 0xFFFF
+              - lvgl.page.next:
         - switch:
             align: right_mid
         - checkbox: