Switch to urwid. Implement listbox with j/k navigation, adding and removing items

App.py

@@ -1,108 +1,53 @@
-from textual.containers import Container, Vertical
-from textual.app import ComposeResult, App
-from textual.widgets import Static, Header, DataTable
-from textual.widget import Widget
+import urwid
 
 
-class FeedPane(Widget):
-    def __init__(self):
-        super().__init__()
-        self.id = "feed-pane"
-
-    def add(self, content):
-        table = self.query_one(DataTable)
-        table.add_rows([[item] for item in content])
-
-    def addColumn(self, title):
-        table = self.query_one(DataTable)
-        table.add_column(title, width=60)
-
-    def clear(self):
-        table = self.query_one(DataTable)
-        table.data = {}
-        table.rows = {}
-        table.row_count = 0
-        table._line_no = 0
-        table._y_offsets = []
-        table._new_rows = set()
-        table._clear_caches()
-        table._require_update_dimensions = True
-        table.check_idle()
-
-    def currentValue(self):
-        table = self.query_one(DataTable)
-        row_num = table.cursor_cell.row
-        column_num = table.cursor_cell.column
-        return table.data[row_num][column_num]
-
-    def focus(self):
-        table = self.query_one(DataTable)
-        table.focus()
-
-    def compose(self):
-        yield DataTable(id="feeds_table")
+class TUI(urwid.Frame):
 
+    @classmethod
+    def create(cls):
 
-class FeedItem(Static):
-    def __init__(self, content, id):
-        super().__init__()
-        self.content = content
-        self.id = "feed-" + str(id)
-        if id == 0:
-            self.set_styles("color: blue;")
-
-    def on_mount(self):
-        self.update(self.content)
-        self.on_event
-
+        tui = cls()
+        palette = [('header', 'white', 'black'), ('reveal focus', 'black', 'dark cyan', 'standout')]
+        loop = urwid.MainLoop(
+            tui,
+            palette,
+            event_loop=urwid.AsyncioEventLoop(),
+        )
+        tui.loop = loop
 
-class GUI(App):
-    CSS_PATH = "app.css"
+        return tui
 
     def __init__(self):
-        super().__init__()
-
-    def on_key(self, event):
-        if event.key == "j":
-            pane = self.query_one(DataTable)
-            pane.key_down(event)
-        elif event.key == "k":
-            pane = self.query_one(DataTable)
-            pane.key_up(event)
-        elif event.key == "a":
-            pane = self.query_one(FeedPane)
-            pane.add(["XXX"])
-        elif event.key == "r":
-            pane = self.query_one(FeedPane)
-            pane.clear()
-        elif event.key == "space":
-            pane = self.query_one(FeedPane)
-            pane.add([pane.currentValue()])
+        self.loop = None
+        self.items = [urwid.Text("Feed# " + str(i)) for i in range(0, 15)]
+        walker = urwid.SimpleListWalker([urwid.AttrMap(item, None, 'reveal focus') for item in self.items])
+        self.lb = urwid.ListBox(walker)
+        self.body = self.lb
+
+        super().__init__(self.body)
+
+    def run(self):
+        self.loop.run()
+        self.executor.shutdown(wait=False)
+
+    def keypress(self, size, key):
+        if key in ("j", "down"):
+            item_size = len(self.lb.body)
+            focus_widget, idx = self.lb.get_focus()
+            if idx < item_size - 1:
+                idx = idx + 1
+                self.lb.set_focus(idx)
+        elif key in ("k", "up"):
+            focus_widget, idx = self.lb.get_focus()
+            if idx > 0:
+                idx = idx - 1
+                self.lb.set_focus(idx)
+        elif key == "a":
+            self.lb.body.append(urwid.AttrMap(urwid.Text("XXX"), None, 'reveal focus'))
         else:
-            pass
-
-    def compose(self) -> ComposeResult:
-        yield Header()
-        yield Container(
-            FeedPane(),
-            Vertical(
-                *[Static("Horizontally"),
-                  Static("Positioned"),
-                  Static("Children"),
-                  Static("Here")],
-                id="right-pane",
-            ),
-            id="app-grid",
-        )
-
-    def on_mount(self):
-        fp = self.query_one(FeedPane)
-        fp.addColumn("Feeds")
-        fp.add(["Feed#" + str(number) for number in range(15)])
-        # fp.add_rows([[FeedItem(f"Feed# {number}", number)] for number in range(15)])
-        fp.focus()
+            self.lb.keypress(size, key)
+            del self.lb.body[3]
 
 
-if __name__ == "__main__":
-    app = GUI()
-    app.run()
+tui = TUI.create()
+tui.run()