Start working on rendering part

cheuph/render/element.py

@@ -0,0 +1,29 @@
+from typing import Hashable, List
+
+from .markup import AttributedText
+
+__all__ = ["Id", "Element", "ElementSupply", "RenderedElement"]
+
+Id = Hashable
+
+class Element:
+    pass
+
+class ElementSupply:
+    pass
+
+class RenderedElement:
+    def __init__(self,
+            element: Element,
+            rendered: List[AttributedText],
+            ) -> None:
+        self._element = element
+        self._lines = rendered
+
+    @property
+    def element(self) -> Element:
+        return self._element
+
+    @property
+    def height(self) -> int:
+        return len(self._lines)