[lvgl] Enhancements (#7453)

esphome/components/lvgl/hello_world.py

@@ -0,0 +1,64 @@
+from io import StringIO
+
+from esphome.yaml_util import parse_yaml
+
+CONFIG = """
+- obj:
+    radius: 0
+    pad_all: 12
+    bg_color: 0xFFFFFF
+    height: 100%
+    width: 100%
+    widgets:
+    - spinner:
+        id: hello_world_spinner_
+        align: center
+        indicator:
+          arc_color: tomato
+        height: 100
+        width: 100
+        spin_time: 2s
+        arc_length: 60deg
+    - label:
+        id: hello_world_label_
+        text: "Hello World!"
+        align: center
+        on_click:
+            lvgl.spinner.update:
+              id: hello_world_spinner_
+              arc_color: springgreen
+    - checkbox:
+        pad_all: 8
+        text: Checkbox
+        align: top_right
+        on_click:
+          lvgl.label.update:
+            id: hello_world_label_
+            text: "Checked!"
+    - button:
+        pad_all: 8
+        checkable: true
+        align: top_left
+        text_font: montserrat_20
+        on_click:
+          lvgl.label.update:
+            id: hello_world_label_
+            text: "Clicked!"
+        widgets:
+          - label:
+              text: "Button"
+    - slider:
+        width: 80%
+        align: bottom_mid
+        on_value:
+          lvgl.label.update:
+            id: hello_world_label_
+            text:
+              format: "%.0f%%"
+              args: [x]
+"""
+
+
+def get_hello_world():
+    with StringIO(CONFIG) as fp:
+        return parse_yaml("hello_world", fp)