[lvgl] Revise code generation to allow early widget creation (#7611)

esphome/components/lvgl/__init__.py

@@ -22,7 +22,7 @@ from esphome.helpers import write_file_if_changed
 
 from . import defines as df, helpers, lv_validation as lvalid
 from .automation import disp_update, focused_widgets, update_to_code
-from .defines import CONF_WIDGETS, add_define
+from .defines import add_define
 from .encoders import ENCODERS_CONFIG, encoders_to_code, initial_focus_to_code
 from .gradient import GRADIENT_SCHEMA, gradients_to_code
 from .hello_world import get_hello_world
@@ -54,7 +54,7 @@ from .types import (
     lv_style_t,
     lvgl_ns,
 )
-from .widgets import Widget, add_widgets, lv_scr_act, set_obj_properties, styles_used
+from .widgets import Widget, add_widgets, get_scr_act, set_obj_properties, styles_used
 from .widgets.animimg import animimg_spec
 from .widgets.arc import arc_spec
 from .widgets.button import button_spec
@@ -186,7 +186,7 @@ def final_validation(config):
 
 async def to_code(config):
     cg.add_library("lvgl/lvgl", "8.4.0")
-    CORE.add_define("USE_LVGL")
+    cg.add_define("USE_LVGL")
     # suppress default enabling of extra widgets
     add_define("_LV_KCONFIG_PRESENT")
     # Always enable - lots of things use it.
@@ -200,7 +200,13 @@ async def to_code(config):
     add_define("LV_MEM_CUSTOM_REALLOC", "lv_custom_mem_realloc")
     add_define("LV_MEM_CUSTOM_INCLUDE", '"esphome/components/lvgl/lvgl_hal.h"')
 
-    add_define("LV_LOG_LEVEL", f"LV_LOG_LEVEL_{config[df.CONF_LOG_LEVEL]}")
+    add_define(
+        "LV_LOG_LEVEL", f"LV_LOG_LEVEL_{df.LV_LOG_LEVELS[config[df.CONF_LOG_LEVEL]]}"
+    )
+    cg.add_define(
+        "LVGL_LOG_LEVEL",
+        cg.RawExpression(f"ESPHOME_LOG_LEVEL_{config[df.CONF_LOG_LEVEL]}"),
+    )
     add_define("LV_COLOR_DEPTH", config[df.CONF_COLOR_DEPTH])
     for font in helpers.lv_fonts_used:
         add_define(f"LV_FONT_{font.upper()}")
@@ -214,15 +220,9 @@ async def to_code(config):
         "LV_COLOR_CHROMA_KEY",
         await lvalid.lv_color.process(config[df.CONF_TRANSPARENCY_KEY]),
     )
-    CORE.add_build_flag("-Isrc")
+    cg.add_build_flag("-Isrc")
 
     cg.add_global(lvgl_ns.using)
-    lv_component = cg.new_Pvariable(config[CONF_ID])
-    await cg.register_component(lv_component, config)
-    Widget.create(config[CONF_ID], lv_component, obj_spec, config)
-    for display in config[df.CONF_DISPLAYS]:
-        cg.add(lv_component.add_display(await cg.get_variable(display)))
-
     frac = config[CONF_BUFFER_SIZE]
     if frac >= 0.75:
         frac = 1
@@ -232,10 +232,17 @@ async def to_code(config):
         frac = 4
     else:
         frac = 8
-    cg.add(lv_component.set_buffer_frac(int(frac)))
+    displays = [await cg.get_variable(display) for display in config[df.CONF_DISPLAYS]]
-    cg.add(lv_component.set_full_refresh(config[df.CONF_FULL_REFRESH]))
+    lv_component = cg.new_Pvariable(
-    cg.add(lv_component.set_draw_rounding(config[df.CONF_DRAW_ROUNDING]))
+        config[CONF_ID],
-    cg.add(lv_component.set_resume_on_input(config[df.CONF_RESUME_ON_INPUT]))
+        displays,
+        frac,
+        config[df.CONF_FULL_REFRESH],
+        config[df.CONF_DRAW_ROUNDING],
+        config[df.CONF_RESUME_ON_INPUT],
+    )
+    await cg.register_component(lv_component, config)
+    Widget.create(config[CONF_ID], lv_component, obj_spec, config)
 
     for font in helpers.esphome_fonts_used:
         await cg.get_variable(font)
@@ -257,6 +264,7 @@ async def to_code(config):
     else:
         add_define("LV_FONT_DEFAULT", await lvalid.lv_font.process(default_font))
 
+    lv_scr_act = get_scr_act(lv_component)
     async with LvContext(lv_component):
         await touchscreens_to_code(lv_component, config)
         await encoders_to_code(lv_component, config)
@@ -266,11 +274,9 @@ async def to_code(config):
         await set_obj_properties(lv_scr_act, config)
         await add_widgets(lv_scr_act, config)
         await add_pages(lv_component, config)
-        await add_top_layer(config)
+        await add_top_layer(lv_component, config)
-        await msgboxes_to_code(config)
+        await msgboxes_to_code(lv_component, config)
-        await disp_update(f"{lv_component}->get_disp()", config)
+        await disp_update(lv_component.get_disp(), config)
-    # At this point only the setup code should be generated
-    assert LvContext.added_lambda_count == 1
     # Set this directly since we are limited in how many methods can be added to the Widget class.
     Widget.widgets_completed = True
     async with LvContext(lv_component):
@@ -291,15 +297,15 @@ async def to_code(config):
             await build_automation(resume_trigger, [], conf)
 
     for comp in helpers.lvgl_components_required:
-        CORE.add_define(f"USE_LVGL_{comp.upper()}")
+        cg.add_define(f"USE_LVGL_{comp.upper()}")
     if "transform_angle" in styles_used:
         add_define("LV_COLOR_SCREEN_TRANSP", "1")
     for use in helpers.lv_uses:
         add_define(f"LV_USE_{use.upper()}")
     lv_conf_h_file = CORE.relative_src_path(LV_CONF_FILENAME)
     write_file_if_changed(lv_conf_h_file, generate_lv_conf_h())
-    CORE.add_build_flag("-DLV_CONF_H=1")
+    cg.add_build_flag("-DLV_CONF_H=1")
-    CORE.add_build_flag(f'-DLV_CONF_PATH="{LV_CONF_FILENAME}"')
+    cg.add_build_flag(f'-DLV_CONF_PATH="{LV_CONF_FILENAME}"')
 
 
 def display_schema(config):
@@ -308,9 +314,9 @@ def display_schema(config):
 
 
 def add_hello_world(config):
-    if CONF_WIDGETS not in config and CONF_PAGES not in config:
+    if df.CONF_WIDGETS not in config and CONF_PAGES not in config:
         LOGGER.info("No pages or widgets configured, creating default hello_world page")
-        config[CONF_WIDGETS] = cv.ensure_list(WIDGET_SCHEMA)(get_hello_world())
+        config[df.CONF_WIDGETS] = cv.ensure_list(WIDGET_SCHEMA)(get_hello_world())
     return config
 
 
@@ -329,7 +335,7 @@ CONFIG_SCHEMA = (
             cv.Optional(df.CONF_DRAW_ROUNDING, default=2): cv.positive_int,
             cv.Optional(CONF_BUFFER_SIZE, default="100%"): cv.percentage,
             cv.Optional(df.CONF_LOG_LEVEL, default="WARN"): cv.one_of(
-                *df.LOG_LEVELS, upper=True
+                *df.LV_LOG_LEVELS, upper=True
             ),
             cv.Optional(df.CONF_BYTE_ORDER, default="big_endian"): cv.one_of(
                 "big_endian", "little_endian"

esphome/components/lvgl/automation.py

@@ -5,7 +5,7 @@ from esphome import automation
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.const import CONF_ACTION, CONF_GROUP, CONF_ID, CONF_TIMEOUT
-from esphome.cpp_generator import RawExpression, get_variable
+from esphome.cpp_generator import get_variable
 from esphome.cpp_types import nullptr
 
 from .defines import (
@@ -23,7 +23,6 @@ from .lvcode import (
     UPDATE_EVENT,
     LambdaContext,
     LocalVariable,
-    LvConditional,
     LvglComponent,
     ReturnStatement,
     add_line_marks,
@@ -47,8 +46,8 @@ from .types import (
 )
 from .widgets import (
     Widget,
+    get_scr_act,
     get_widgets,
-    lv_scr_act,
     set_obj_properties,
     wait_for_widgets,
 )
@@ -66,8 +65,6 @@ async def action_to_code(
 ):
     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:
             await action(widget)
     var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
@@ -126,7 +123,7 @@ async def lvgl_is_idle(config, condition_id, template_arg, args):
 async def disp_update(disp, config: dict):
     if CONF_DISP_BG_COLOR not in config and CONF_DISP_BG_IMAGE not in config:
         return
-    with LocalVariable("lv_disp_tmp", lv_disp_t, literal(disp)) as disp_temp:
+    with LocalVariable("lv_disp_tmp", lv_disp_t, disp) as disp_temp:
         if (bg_color := config.get(CONF_DISP_BG_COLOR)) is not None:
             lv.disp_set_bg_color(disp_temp, await lv_color.process(bg_color))
         if bg_image := config.get(CONF_DISP_BG_IMAGE):
@@ -136,15 +133,24 @@ async def disp_update(disp, config: dict):
 @automation.register_action(
     "lvgl.widget.redraw",
     ObjUpdateAction,
-    cv.Schema(
+    cv.Any(
-        {
+        cv.maybe_simple_value(
-            cv.Optional(CONF_ID): cv.use_id(lv_obj_t),
+            {
-            cv.GenerateID(CONF_LVGL_ID): cv.use_id(LvglComponent),
+                cv.Required(CONF_ID): cv.use_id(lv_obj_t),
-        }
+                cv.GenerateID(CONF_LVGL_ID): cv.use_id(LvglComponent),
+            },
+            key=CONF_ID,
+        ),
+        cv.Schema(
+            {
+                cv.GenerateID(CONF_LVGL_ID): cv.use_id(LvglComponent),
+            }
+        ),
     ),
 )
 async def obj_invalidate_to_code(config, action_id, template_arg, args):
-    widgets = await get_widgets(config) or [lv_scr_act]
+    lv_comp = await cg.get_variable(config[CONF_LVGL_ID])
+    widgets = await get_widgets(config) or [get_scr_act(lv_comp)]
 
     async def do_invalidate(widget: Widget):
         lv_obj.invalidate(widget.obj)
@@ -164,7 +170,7 @@ async def obj_invalidate_to_code(config, action_id, template_arg, args):
 async def lvgl_update_to_code(config, action_id, template_arg, args):
     widgets = await get_widgets(config)
     w = widgets[0]
-    disp = f"{w.obj}->get_disp()"
+    disp = literal(f"{w.obj}->get_disp()")
     async with LambdaContext(LVGL_COMP_ARG, where=action_id) as context:
         await disp_update(disp, config)
     var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())

esphome/components/lvgl/defines.py

@@ -189,14 +189,14 @@ LV_ANIM = LvConstant(
 LV_GRAD_DIR = LvConstant("LV_GRAD_DIR_", "NONE", "HOR", "VER")
 LV_DITHER = LvConstant("LV_DITHER_", "NONE", "ORDERED", "ERR_DIFF")
 
-LOG_LEVELS = (
+LV_LOG_LEVELS = {
-    "TRACE",
+    "VERBOSE": "TRACE",
-    "INFO",
+    "DEBUG": "TRACE",
-    "WARN",
+    "INFO": "INFO",
-    "ERROR",
+    "WARN": "WARN",
-    "USER",
+    "ERROR": "ERROR",
-    "NONE",
+    "NONE": "NONE",
-)
+}
 
 LV_LONG_MODES = LvConstant(
     "LV_LABEL_LONG_",

esphome/components/lvgl/lvcode.py

@@ -183,17 +183,11 @@ class LvContext(LambdaContext):
         super().__init__(parameters=self.args)
         self.lv_component = lv_component
 
-    async def add_init_lambda(self):
-        if self.code_list:
-            cg.add(self.lv_component.add_init_lambda(await self.get_lambda()))
-            LvContext.added_lambda_count += 1
-
     async def __aexit__(self, exc_type, exc_val, exc_tb):
         await super().__aexit__(exc_type, exc_val, exc_tb)
-        await self.add_init_lambda()
 
     def add(self, expression: Union[Expression, Statement]):
-        self.code_list.append(self.indented_statement(expression))
+        cg.add(expression)
         return expression
 
     def __call__(self, *args):

esphome/components/lvgl/lvgl_esphome.cpp

@@ -11,12 +11,6 @@ namespace esphome {
 namespace lvgl {
 static const char *const TAG = "lvgl";
 
-#if LV_USE_LOG
-static void log_cb(const char *buf) {
-  esp_log_printf_(ESPHOME_LOG_LEVEL_INFO, TAG, 0, "%.*s", (int) strlen(buf) - 1, buf);
-}
-#endif  // LV_USE_LOG
-
 static const char *const EVENT_NAMES[] = {
     "NONE",
     "PRESSED",
@@ -383,26 +377,48 @@ void LvglComponent::write_random_() {
   }
 }
 
-void LvglComponent::setup() {
+/**
-  ESP_LOGCONFIG(TAG, "LVGL Setup starts");
+ * @class LvglComponent
-#if LV_USE_LOG
+ * @brief Component for rendering LVGL.
-  lv_log_register_print_cb(log_cb);
+ *
-#endif
+ * This component renders LVGL widgets on a display. Some initialisation must be done in the constructor
+ * since LVGL needs to be initialised before any widgets can be created.
+ *
+ * @param displays a list of displays to render onto. All displays must have the same
+ *                 resolution.
+ * @param buffer_frac the fraction of the display resolution to use for the LVGL
+ *                    draw buffer. A higher value will make animations smoother but
+ *                    also increase memory usage.
+ * @param full_refresh if true, the display will be fully refreshed on every frame.
+ *                     If false, only changed areas will be updated.
+ * @param draw_rounding the rounding to use when drawing. A value of 1 will draw
+ *                      without any rounding, a value of 2 will round to the nearest
+ *                      multiple of 2, and so on.
+ * @param resume_on_input if true, this component will resume rendering when the user
+ *                         presses a key or clicks on the screen.
+ */
+LvglComponent::LvglComponent(std::vector<display::Display *> displays, float buffer_frac, bool full_refresh,
+                             int draw_rounding, bool resume_on_input)
+    : draw_rounding(draw_rounding),
+      displays_(std::move(displays)),
+      buffer_frac_(buffer_frac),
+      full_refresh_(full_refresh),
+      resume_on_input_(resume_on_input) {
   lv_init();
   lv_update_event = static_cast<lv_event_code_t>(lv_event_register_id());
   lv_api_event = static_cast<lv_event_code_t>(lv_event_register_id());
   auto *display = this->displays_[0];
   size_t buffer_pixels = display->get_width() * display->get_height() / this->buffer_frac_;
   auto buf_bytes = buffer_pixels * LV_COLOR_DEPTH / 8;
-  auto *buf = lv_custom_mem_alloc(buf_bytes);  // NOLINT
+  this->rotation = display->get_rotation();
-  if (buf == nullptr) {
+  if (this->rotation != display::DISPLAY_ROTATION_0_DEGREES) {
-#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_ERROR
+    this->rotate_buf_ = static_cast<lv_color_t *>(lv_custom_mem_alloc(buf_bytes));  // NOLINT
-    ESP_LOGE(TAG, "Malloc failed to allocate %zu bytes", buf_bytes);
+    if (this->rotate_buf_ == nullptr)
-#endif
+      return;
-    this->mark_failed();
-    this->status_set_error("Memory allocation failure");
-    return;
   }
+  auto *buf = lv_custom_mem_alloc(buf_bytes);  // NOLINT
+  if (buf == nullptr)
+    return;
   lv_disp_draw_buf_init(&this->draw_buf_, buf, nullptr, buffer_pixels);
   lv_disp_drv_init(&this->disp_drv_);
   this->disp_drv_.draw_buf = &this->draw_buf_;
@@ -410,18 +426,7 @@ void LvglComponent::setup() {
   this->disp_drv_.full_refresh = this->full_refresh_;
   this->disp_drv_.flush_cb = static_flush_cb;
   this->disp_drv_.rounder_cb = rounder_cb;
-  this->rotation = display->get_rotation();
+  // reset the display rotation since we will handle all rotations
-  if (this->rotation != display::DISPLAY_ROTATION_0_DEGREES) {
-    this->rotate_buf_ = static_cast<lv_color_t *>(lv_custom_mem_alloc(buf_bytes));  // NOLINT
-    if (this->rotate_buf_ == nullptr) {
-#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_ERROR
-      ESP_LOGE(TAG, "Malloc failed to allocate %zu bytes", buf_bytes);
-#endif
-      this->mark_failed();
-      this->status_set_error("Memory allocation failure");
-      return;
-    }
-  }
   display->set_rotation(display::DISPLAY_ROTATION_0_DEGREES);
   switch (this->rotation) {
     default:
@@ -435,12 +440,30 @@ void LvglComponent::setup() {
       break;
   }
   this->disp_ = lv_disp_drv_register(&this->disp_drv_);
-  for (const auto &v : this->init_lambdas_)
+}
-    v(this);
+
+void LvglComponent::setup() {
+  if (this->draw_buf_.buf1 == nullptr) {
+    this->mark_failed();
+    this->status_set_error("Memory allocation failure");
+    return;
+  }
+  ESP_LOGCONFIG(TAG, "LVGL Setup starts");
+#if LV_USE_LOG
+  lv_log_register_print_cb([](const char *buf) {
+    auto next = strchr(buf, ')');
+    if (next != nullptr)
+      buf = next + 1;
+    while (isspace(*buf))
+      buf++;
+    esp_log_printf_(LVGL_LOG_LEVEL, TAG, 0, "%.*s", (int) strlen(buf) - 1, buf);
+  });
+#endif
   this->show_page(0, LV_SCR_LOAD_ANIM_NONE, 0);
   lv_disp_trig_activity(this->disp_);
   ESP_LOGCONFIG(TAG, "LVGL Setup complete");
 }
+
 void LvglComponent::update() {
   // update indicators
   if (this->paused_) {
@@ -455,13 +478,6 @@ 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_ANIMIMG
 void lv_animimg_stop(lv_obj_t *obj) {

esphome/components/lvgl/lvgl_esphome.h

@@ -39,7 +39,6 @@ namespace lvgl {
 extern lv_event_code_t lv_api_event;     // NOLINT
 extern lv_event_code_t lv_update_event;  // NOLINT
 extern std::string lv_event_code_name_for(uint8_t event_code);
-extern bool lv_is_pre_initialise();
 #if LV_COLOR_DEPTH == 16
 static const display::ColorBitness LV_BITNESS = display::ColorBitness::COLOR_BITNESS_565;
 #elif LV_COLOR_DEPTH == 32
@@ -108,6 +107,8 @@ class LvglComponent : public PollingComponent {
   constexpr static const char *const TAG = "lvgl";
 
  public:
+  LvglComponent(std::vector<display::Display *> displays, float buffer_frac, bool full_refresh, int draw_rounding,
+                bool resume_on_input);
   static void static_flush_cb(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p);
 
   float get_setup_priority() const override { return setup_priority::PROCESSOR; }
@@ -118,13 +119,10 @@ class LvglComponent : public PollingComponent {
     this->idle_callbacks_.add(std::move(callback));
   }
   void add_on_pause_callback(std::function<void(bool)> &&callback) { this->pause_callbacks_.add(std::move(callback)); }
-  void add_display(display::Display *display) { this->displays_.push_back(display); }
-  void add_init_lambda(const std::function<void(LvglComponent *)> &lamb) { this->init_lambdas_.push_back(lamb); }
   void dump_config() override;
-  void set_full_refresh(bool full_refresh) { this->full_refresh_ = full_refresh; }
   bool is_idle(uint32_t idle_ms) { return lv_disp_get_inactive_time(this->disp_) > idle_ms; }
-  void set_buffer_frac(size_t frac) { this->buffer_frac_ = frac; }
   lv_disp_t *get_disp() { return this->disp_; }
+  lv_obj_t *get_scr_act() { return lv_disp_get_scr_act(this->disp_); }
   // Pause or resume the display.
   // @param paused If true, pause the display. If false, resume the display.
   // @param show_snow If true, show the snow effect when paused.
@@ -155,17 +153,19 @@ class LvglComponent : public PollingComponent {
   }
   // rounding factor to align bounds of update area when drawing
   size_t draw_rounding{2};
-  void set_draw_rounding(size_t rounding) { this->draw_rounding = rounding; }
-  void set_resume_on_input(bool resume_on_input) { this->resume_on_input_ = resume_on_input; }
 
-  // if set to true, the bounds of the update area will always start at 0,0
   display::DisplayRotation rotation{display::DISPLAY_ROTATION_0_DEGREES};
 
  protected:
   void write_random_();
   void draw_buffer_(const lv_area_t *area, lv_color_t *ptr);
   void flush_cb_(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p);
+
   std::vector<display::Display *> displays_{};
+  size_t buffer_frac_{1};
+  bool full_refresh_{};
+  bool resume_on_input_{};
+
   lv_disp_draw_buf_t draw_buf_{};
   lv_disp_drv_t disp_drv_{};
   lv_disp_t *disp_{};
@@ -174,14 +174,10 @@ class LvglComponent : public PollingComponent {
   size_t current_page_{0};
   bool show_snow_{};
   bool page_wrap_{true};
-  bool resume_on_input_{};
   std::map<lv_group_t *, lv_obj_t *> focus_marks_{};
 
-  std::vector<std::function<void(LvglComponent *lv_component)>> init_lambdas_;
   CallbackManager<void(uint32_t)> idle_callbacks_{};
   CallbackManager<void(bool)> pause_callbacks_{};
-  size_t buffer_frac_{1};
-  bool full_refresh_{};
   lv_color_t *rotate_buf_{};
 };
 

esphome/components/lvgl/styles.py

@@ -17,8 +17,6 @@ from .types import lv_lambda_t, lv_obj_t, lv_obj_t_ptr
 from .widgets import Widget, add_widgets, set_obj_properties, theme_widget_map
 from .widgets.obj import obj_spec
 
-TOP_LAYER = literal("lv_disp_get_layer_top(lv_component->get_disp())")
-
 
 async def styles_to_code(config):
     """Convert styles to C__ code."""
@@ -51,9 +49,10 @@ async def theme_to_code(config):
             lv_assign(apply, await context.get_lambda())
 
 
-async def add_top_layer(config):
+async def add_top_layer(lv_component, config):
+    top_layer = lv.disp_get_layer_top(lv_component.get_disp())
     if top_conf := config.get(CONF_TOP_LAYER):
-        with LocalVariable("top_layer", lv_obj_t, TOP_LAYER) as top_layer_obj:
+        with LocalVariable("top_layer", lv_obj_t, top_layer) as top_layer_obj:
             top_w = Widget(top_layer_obj, obj_spec, top_conf)
             await set_obj_properties(top_w, top_conf)
             await add_widgets(top_w, top_conf)

esphome/components/lvgl/widgets/__init__.py

@@ -55,18 +55,6 @@ theme_widget_map = {}
 styles_used = set()
 
 
-class LvScrActType(WidgetType):
-    """
-    A "widget" representing the active screen.
-    """
-
-    def __init__(self):
-        super().__init__("lv_scr_act()", lv_obj_t, ())
-
-    async def to_code(self, w, config: dict):
-        return []
-
-
 class Widget:
     """
     Represents a Widget.
@@ -221,6 +209,25 @@ class Widget:
 widget_map: dict[Any, Widget] = {}
 
 
+class LvScrActType(WidgetType):
+    """
+    A "widget" representing the active screen.
+    """
+
+    def __init__(self):
+        super().__init__("lv_scr_act()", lv_obj_t, ())
+
+    async def to_code(self, w, config: dict):
+        return []
+
+
+lv_scr_act_spec = LvScrActType()
+
+
+def get_scr_act(lv_comp: MockObj) -> Widget:
+    return Widget.create(None, lv_comp.get_scr_act(), lv_scr_act_spec, {})
+
+
 def get_widget_generator(wid):
     """
     Used to wait for a widget during code generation.
@@ -451,7 +458,3 @@ async def widget_to_code(w_cnfig, w_type: WidgetType, parent):
     await set_obj_properties(w, w_cnfig)
     await add_widgets(w, w_cnfig)
     await spec.to_code(w, w_cnfig)
-
-
-lv_scr_act_spec = LvScrActType()
-lv_scr_act = Widget.create(None, literal("lv_scr_act()"), lv_scr_act_spec, {})

esphome/components/lvgl/widgets/msgbox.py

@@ -20,6 +20,7 @@ from ..lvcode import (
     EVENT_ARG,
     LambdaContext,
     LocalVariable,
+    lv,
     lv_add,
     lv_assign,
     lv_expr,
@@ -27,7 +28,6 @@ from ..lvcode import (
     lv_Pvariable,
 )
 from ..schemas import STYLE_SCHEMA, STYLED_TEXT_SCHEMA, container_schema, part_schema
-from ..styles import TOP_LAYER
 from ..types import LV_EVENT, char_ptr, lv_obj_t
 from . import Widget, set_obj_properties
 from .button import button_spec
@@ -59,7 +59,7 @@ MSGBOX_SCHEMA = container_schema(
 )
 
 
-async def msgbox_to_code(conf):
+async def msgbox_to_code(top_layer, conf):
     """
     Construct a message box. This consists of a full-screen translucent background enclosing a centered container
     with an optional title, body, close button and a button matrix. And any other widgets the user cares to add
@@ -101,7 +101,7 @@ async def msgbox_to_code(conf):
     text = await lv_text.process(conf[CONF_BODY].get(CONF_TEXT, ""))
     title = await lv_text.process(conf[CONF_TITLE].get(CONF_TEXT, ""))
     close_button = conf[CONF_CLOSE_BUTTON]
-    lv_assign(outer, lv_expr.obj_create(TOP_LAYER))
+    lv_assign(outer, lv_expr.obj_create(top_layer))
     lv_obj.set_width(outer, lv_pct(100))
     lv_obj.set_height(outer, lv_pct(100))
     lv_obj.set_style_bg_opa(outer, 128, 0)
@@ -141,6 +141,7 @@ async def msgbox_to_code(conf):
         set_btn_data(buttonmatrix.obj, ctrl_list, width_list)
 
 
-async def msgboxes_to_code(config):
+async def msgboxes_to_code(lv_component, config):
+    top_layer = lv.disp_get_layer_top(lv_component.get_disp())
     for conf in config.get(CONF_MSGBOXES, ()):
-        await msgbox_to_code(conf)
+        await msgbox_to_code(top_layer, conf)

tests/components/lvgl/lvgl-package.yaml

@@ -12,12 +12,12 @@ substitutions:
   arrow_down: "\U000F004B"
 
 lvgl:
+  log_level: debug
   resume_on_input: true
   on_pause:
     logger.log: LVGL is Paused
   on_resume:
     logger.log: LVGL has resumed
-  log_level: TRACE
   bg_color: light_blue
   disp_bg_color: color_id
   disp_bg_image: cat_image
@@ -125,6 +125,8 @@ lvgl:
       on_unload:
         - logger.log: page unloaded
         - lvgl.widget.focus: mark
+        - lvgl.widget.redraw: hello_label
+        - lvgl.widget.redraw:
       on_all_events:
         logger.log:
           format: "Event %s"