Add basic cursor tree widget

cheuph/__init__.py

@@ -4,6 +4,7 @@ from .attributed_lines import *
 from .attributed_lines_widget import *
 from .attributed_text_widget import *
 from .cursor_rendering import *
+from .cursor_tree_widget import *
 from .element import *
 from .element_supply import *
 from .markup import *
@@ -15,6 +16,7 @@ __all__ += attributed_lines.__all__
 __all__ += attributed_lines_widget.__all__
 __all__ += attributed_text_widget.__all__
 __all__ += cursor_rendering.__all__
+__all__ += cursor_tree_widget.__all__
 __all__ += element.__all__
 __all__ += element_supply.__all__
 __all__ += markup.__all__

cheuph/cursor_tree_widget.py

@@ -0,0 +1,48 @@
+import datetime
+import time
+from typing import Tuple, TypeVar
+
+import urwid
+
+from .attributed_lines_widget import AttributedLinesWidget
+from .cursor_rendering import CursorTreeRenderer
+from .element import Element, Message
+
+__all__ = ["CursorTreeWidget"]
+
+E = TypeVar("E", bound=Element)
+
+class CursorTreeWidget(urwid.WidgetWrap):
+    """
+    This widget draws a CursorTree and moves the cursor around.
+    """
+
+    def __init__(self, tree: CursorTreeRenderer[E]) -> None:
+        self._tree = tree
+        self._lines_widget = AttributedLinesWidget()
+        super().__init__(self._lines_widget)
+
+    def render(self, size: Tuple[int, int], focus: bool) -> None:
+        width, height = size
+
+        self._tree.render(width, height)
+        self._lines_widget.set_lines(self._tree.lines)
+
+        return super().render(size, focus)
+
+    def selectable(self):
+        return True
+
+    def keypress(self, size: Tuple[int, int], key: str):
+        if key == "shift up":
+            self._tree.scroll(-1)
+        elif key == "shift down":
+            self._tree.scroll(1)
+        elif key == "shift right":
+            self._tree.scroll_horizontally(1)
+        elif key == "shift left":
+            self._tree.scroll_horizontally(-1)
+        else:
+            t = datetime.datetime(2019,5,7,13,25,6)
+            self._tree._supply.add(Message(str(time.time()), None, t, "key", key))
+            self._invalidate()

test_scripts/test_cursor_tree_widget.py

@@ -0,0 +1,35 @@
+import datetime
+
+import urwid
+import urwid.curses_display
+
+import cheuph
+from cheuph import (AT, BasicCursorRenderer, CursorTreeRenderer,
+                    CursorTreeWidget, InMemorySupply, Message)
+
+
+def add(supply, level, text, amount=4):
+    t = datetime.datetime(2019, 5, 7, 13, 25, 6)
+    if level < 0: return
+    for i in range(amount):
+        new_text = f"{text}->{i}"
+        supply.add(Message(new_text, text or None, t, str(i), new_text))
+        add(supply, level - 1, new_text, amount=amount)
+
+def main():
+    s = InMemorySupply()
+    r = BasicCursorRenderer()
+    t = CursorTreeRenderer(s, r)
+
+    add(s, 4, "")
+
+    #screen = urwid.curses_display.Screen()
+    event_loop = urwid.AsyncioEventLoop()
+    loop = urwid.MainLoop(
+            cheuph.CursorTreeWidget(t),
+            #screen=screen,
+            event_loop=event_loop,
+    )
+    loop.run()
+
+main()