[lvgl] add on_boot trigger (#8498)

esphome/components/lvgl/__init__.py

@@ -10,6 +10,7 @@ from esphome.const import (
     CONF_GROUP,
     CONF_ID,
     CONF_LAMBDA,
+    CONF_ON_BOOT,
     CONF_ON_IDLE,
     CONF_PAGES,
     CONF_TIMEOUT,
@@ -50,7 +51,7 @@ from .schemas import (
 )
 from .styles import add_top_layer, styles_to_code, theme_to_code
 from .touchscreens import touchscreen_schema, touchscreens_to_code
-from .trigger import generate_triggers
+from .trigger import add_on_boot_triggers, generate_triggers
 from .types import (
     FontEngine,
     IdleTrigger,
@@ -365,6 +366,7 @@ async def to_code(configs):
                     conf[CONF_TRIGGER_ID], lv_component, False
                 )
                 await build_automation(resume_trigger, [], conf)
+            await add_on_boot_triggers(config.get(CONF_ON_BOOT, ()))
 
     # This must be done after all widgets are created
     for comp in helpers.lvgl_components_required:

esphome/components/lvgl/schemas.py

@@ -6,6 +6,7 @@ from esphome.const import (
     CONF_FORMAT,
     CONF_GROUP,
     CONF_ID,
+    CONF_ON_BOOT,
     CONF_ON_VALUE,
     CONF_STATE,
     CONF_TEXT,
@@ -14,6 +15,7 @@ from esphome.const import (
     CONF_TYPE,
 )
 from esphome.core import TimePeriod
+from esphome.core.config import StartupTrigger
 from esphome.schema_extractors import SCHEMA_EXTRACT
 
 from . import defines as df, lv_validation as lvalid
@@ -216,14 +218,24 @@ def automation_schema(typ: LvType):
         events = events + (CONF_ON_VALUE,)
     args = typ.get_arg_type() if isinstance(typ, LvType) else []
     args.append(lv_event_t_ptr)
-    return {
+    return cv.Schema(
+        {
             cv.Optional(event): validate_automation(
                 {
-                cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(Trigger.template(*args)),
+                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
+                        Trigger.template(*args)
+                    ),
                 }
             )
             for event in events
         }
+    ).extend(
+        {
+            cv.Optional(CONF_ON_BOOT): validate_automation(
+                {cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(StartupTrigger)}
+            )
+        }
+    )
 
 
 def base_update_schema(widget_type, parts):

esphome/components/lvgl/trigger.py

@@ -1,6 +1,6 @@
 from esphome import automation
 import esphome.codegen as cg
-from esphome.const import CONF_ID, CONF_ON_VALUE, CONF_TRIGGER_ID
+from esphome.const import CONF_ID, CONF_ON_BOOT, CONF_ON_VALUE, CONF_TRIGGER_ID
 
 from .defines import (
     CONF_ALIGN,
@@ -28,6 +28,13 @@ from .types import LV_EVENT
 from .widgets import LvScrActType, get_scr_act, widget_map
 
 
+async def add_on_boot_triggers(triggers):
+    for conf in triggers:
+        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], 390)
+        await cg.register_component(trigger, conf)
+        await automation.build_automation(trigger, [], conf)
+
+
 async def generate_triggers():
     """
     Generate LVGL triggers for all defined widgets
@@ -75,6 +82,8 @@ async def generate_triggers():
                     UPDATE_EVENT,
                 )
 
+            await add_on_boot_triggers(w.config.get(CONF_ON_BOOT, ()))
+
             # Generate align to directives while we're here
             if align_to := w.config.get(CONF_ALIGN_TO):
                 target = widget_map[align_to[CONF_ID]].obj

tests/components/lvgl/lvgl-package.yaml

@@ -24,6 +24,8 @@ lvgl:
     logger.log: LVGL is Paused
   on_resume:
     logger.log: LVGL has resumed
+  on_boot:
+    logger.log: LVGL has started
   bg_color: light_blue
   disp_bg_color: color_id
   disp_bg_image: cat_image
@@ -210,6 +212,10 @@ lvgl:
                   src: !lambda "return {dog_image, cat_image};"
                   duration: 2s
         - label:
+            on_boot:
+              lvgl.label.update:
+                id: hello_label
+                text: Goodbye Cruel World
             id: hello_label
             text: Hello world
             text_color: 0xFF8000