Implement widget for TreeDisplay

cheuph/widgets/tree_display_widget.py

@@ -0,0 +1,38 @@
+from typing import Any, FrozenSet
+
+import urwid
+
+from ..element_supply import ElementSupply
+from ..markup import AT
+from ..tree_display import TreeDisplay
+from .attributed_text_widget import AttributedTextWidget
+
+__all__ = ["TreeDisplayWidget"]
+
+class TreeDisplayWidget(urwid.WidgetWrap):
+    def __init__(self, supply: ElementSupply) -> None:
+        self._display = TreeDisplay(supply, 80, 50)
+
+        self._sizing = frozenset({"box"})
+        self._selectable = False
+
+        # I could set wrap="clip", but the TreeDisplay should already cut its
+        # display_lines to the correct width, based on its size. Leaving the
+        # wrap on might help with users spotting things going wrong.
+        self._text_widget = AttributedTextWidget(AT())
+
+        super().__init__(urwid.Filler(self._text_widget))
+
+    @property
+    def display(self) -> TreeDisplay:
+        return self._display
+
+    def render(self, size: Any, focus: Any) -> Any:
+        self._display.width, self._display.height = size
+        self._display.rerender()
+        self._display.render_display_lines()
+
+        text = AT("\n").join(self._display.display_lines)
+        self._text_widget.set_attributed_text(text)
+
+        return self._w.render(size, focus)