[lvgl] Implement qrcode (#7623)

esphome/components/lvgl/__init__.py

@@ -71,6 +71,7 @@ from .widgets.meter import meter_spec
 from .widgets.msgbox import MSGBOX_SCHEMA, msgboxes_to_code
 from .widgets.obj import obj_spec
 from .widgets.page import add_pages, generate_page_triggers, page_spec
+from .widgets.qrcode import qr_code_spec
 from .widgets.roller import roller_spec
 from .widgets.slider import slider_spec
 from .widgets.spinbox import spinbox_spec
@@ -109,6 +110,7 @@ for w_type in (
     spinbox_spec,
     keyboard_spec,
     tileview_spec,
+    qr_code_spec,
 ):
     WIDGET_TYPES[w_type.name] = w_type
 

esphome/components/lvgl/widgets/qrcode.py

@@ -0,0 +1,54 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.const import CONF_SIZE, CONF_TEXT
+from esphome.cpp_generator import MockObjClass
+
+from ..defines import CONF_MAIN, literal
+from ..lv_validation import color, color_retmapper, lv_text
+from ..lvcode import LocalVariable, lv, lv_expr
+from ..schemas import TEXT_SCHEMA
+from ..types import WidgetType, lv_obj_t
+from . import Widget
+
+CONF_QRCODE = "qrcode"
+CONF_DARK_COLOR = "dark_color"
+CONF_LIGHT_COLOR = "light_color"
+
+QRCODE_SCHEMA = TEXT_SCHEMA.extend(
+    {
+        cv.Optional(CONF_DARK_COLOR, default="black"): color,
+        cv.Optional(CONF_LIGHT_COLOR, default="white"): color,
+        cv.Required(CONF_SIZE): cv.int_,
+    }
+)
+
+
+class QrCodeType(WidgetType):
+    def __init__(self):
+        super().__init__(
+            CONF_QRCODE,
+            lv_obj_t,
+            (CONF_MAIN,),
+            QRCODE_SCHEMA,
+            modify_schema=TEXT_SCHEMA,
+        )
+
+    def get_uses(self):
+        return ("canvas", "img")
+
+    def obj_creator(self, parent: MockObjClass, config: dict):
+        dark_color = color_retmapper(config[CONF_DARK_COLOR])
+        light_color = color_retmapper(config[CONF_LIGHT_COLOR])
+        size = config[CONF_SIZE]
+        return lv_expr.call("qrcode_create", parent, size, dark_color, light_color)
+
+    async def to_code(self, w: Widget, config):
+        if (value := config.get(CONF_TEXT)) is not None:
+            value = await lv_text.process(value)
+            with LocalVariable(
+                "qr_text", cg.const_char_ptr, value, modifier=""
+            ) as str_obj:
+                lv.qrcode_update(w.obj, str_obj, literal(f"strlen({str_obj})"))
+
+
+qr_code_spec = QrCodeType()

tests/components/lvgl/lvgl-package.yaml

@@ -458,6 +458,18 @@ lvgl:
 
     - id: page2
       widgets:
+        - qrcode:
+            id: lv_qr
+            align: left_mid
+            size: 100
+            light_color: whitesmoke
+            dark_color: steelblue
+            text: esphome.io
+            on_click:
+              lvgl.qrcode.update:
+                id: lv_qr
+                text: homeassistant.io
+
         - slider:
             min_value: 0
             max_value: 255