feat: 接入新动作 update_canvas

app/schemas/actions/__init__.py

@@ -10,10 +10,11 @@ from .delete import DeleteAction
 from .move import MoveAction
 from .resize import ResizeAction
 from .update import UpdateAction
+from .update_canvas import UpdateCanvasAction
 
 # 按 type 选择对应模型，不维护重复的操作名称映射
 Action = Annotated[
-    AddAction | DeleteAction | MoveAction | ResizeAction | UpdateAction,
+    AddAction | DeleteAction | MoveAction | ResizeAction | UpdateAction | UpdateCanvasAction,
     Field(discriminator="type"),
 ]
 action_adapter = TypeAdapter(Action)
@@ -32,5 +33,6 @@ __all__ = [
     "MoveAction",
     "ResizeAction",
     "UpdateAction",
+    "UpdateCanvasAction",
     "action_adapter",
 ]

app/schemas/actions/update_canvas.py

@@ -0,0 +1,17 @@
+"""仅更新画布属性，不修改组件或数据源"""
+
+from typing import Literal
+
+from pydantic import Field, JsonValue
+
+from app.schemas.base import NonBlankString
+
+from .base import ActionModel
+
+
+class UpdateCanvasAction(ActionModel):
+    type: Literal["update_canvas"] = "update_canvas"
+    properties: dict[NonBlankString, JsonValue] = Field(
+        min_length=1,
+        description="要替换的 canvas 顶层字段，如 width、height、backgroundColor；未提供的字段保持不变",
+    )