Add basic euphoria single-room application

cheuph/euphoria/single_room_application.py

@@ -0,0 +1,97 @@
+from typing import Any, Optional
+
+import urwid
+
+from .palette import Style
+from .room_widget import RoomWidget
+
+__all__ = ["SingleRoomApplication"]
+
+class ChooseRoomWidget(urwid.WidgetWrap):
+    def __init__(self) -> None:
+        self.text = urwid.Text("Choose a room:", align="center")
+        self.edit = urwid.Edit("&", align="center")
+        self.pile = urwid.Pile([
+            self.text,
+            urwid.AttrMap(self.edit, Style.ROOM),
+        ])
+        self.filler = urwid.Filler(self.pile)
+        super().__init__(self.filler)
+
+    def set_error(self, text: Any) -> None:
+        self.error = urwid.Text(text, align="center")
+        self.pile = urwid.Pile([
+            self.error,
+            self.text,
+            urwid.AttrMap(self.edit, Style.ROOM),
+        ])
+        self.filler = urwid.Filler(self.pile)
+        self._w = self.filler
+
+    def unset_error(self) -> None:
+        self.error = None
+        self.pile = urwid.Pile([
+            self.text,
+            urwid.AttrMap(self.edit, Style.ROOM),
+        ])
+        self.filler = urwid.Filler(self.pile)
+        self._w = self.filler
+
+    def could_not_connect(self, roomname: str) -> None:
+        text = [
+                "Could not connect to ",
+                (Style.ROOM, "&" + roomname),
+                ".\n",
+        ]
+        self.set_error(text)
+
+    def invalid_room_name(self) -> None:
+        # TODO animate the invalid room name thingy?
+        text = ["Invalid room name.\n"]
+        self.set_error(text)
+
+class SingleRoomApplication(urwid.WidgetWrap):
+    ALPHABET = "abcdefghijklmnopqrstuvwxyz"
+    ALLOWED_EDITOR_KEYS = {
+            "backspace", "delete",
+            "left", "right",
+            "home", "end",
+    }
+
+    def __init__(self) -> None:
+        self.choose_room = ChooseRoomWidget()
+        super().__init__(self.choose_room)
+
+    def selectable(self) -> bool:
+        return True
+
+    def switch_to_choose(self) -> None:
+        self.choose_room.could_not_connect(self.choose_room.edit.edit_text)
+        self._w = self.choose_room
+
+    def keypress(self, size: Any, key: str) -> Optional[str]:
+        if self._w == self.choose_room:
+            # This leads to the editor jumping around the screen.
+            #
+            # TODO Find a way for the editor to stay still.
+            self.choose_room.unset_error()
+
+            if key == "enter":
+                roomname = self.choose_room.edit.edit_text
+
+                if roomname:
+                    room = RoomWidget(roomname)
+                    urwid.connect_signal(room, "close", self.switch_to_choose)
+                    room.connect()
+                    self._w = room
+
+            # Make sure we only enter valid room names
+            elif key.lower() in self.ALPHABET:
+                return super().keypress(size, key.lower())
+            elif key in self.ALLOWED_EDITOR_KEYS:
+                return super().keypress(size, key)
+
+            return None
+
+        else:
+            return super().keypress(size, key)