diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4a0a53d..6fe252fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [10.3.0] - Unreleased
+
+### Added
+
+- Added Console.size setter
+- Added Console.width setter
+- Added Console.height setter
+
 ## [10.2.2] - 2021-05-19
 
 ### Fixed
diff --git a/rich/console.py b/rich/console.py
index 56de7719..e6873bbb 100644
--- a/rich/console.py
+++ b/rich/console.py
@@ -962,8 +962,16 @@ class Console:
         Returns:
             int: The width (in characters) of the console.
         """
-        width, _ = self.size
-        return width
+        return self.size.width
+
+    @width.setter
+    def width(self, width: int) -> None:
+        """Set width.
+
+        Args:
+            width (int): New width.
+        """
+        self._width = width
 
     @property
     def height(self) -> int:
@@ -972,8 +980,16 @@ class Console:
         Returns:
             int: The height (in lines) of the console.
         """
-        _, height = self.size
-        return height
+        return self.size.height
+
+    @height.setter
+    def height(self, height: int) -> None:
+        """Set height.
+
+        Args:
+            height (int): new height.
+        """
+        self._height = height
 
     def bell(self) -> None:
         """Play a 'bell' sound (if supported by the terminal)."""
diff --git a/rich/screen.py b/rich/screen.py
index dfbff7f3..e1245467 100644
--- a/rich/screen.py
+++ b/rich/screen.py
@@ -24,6 +24,8 @@ class Screen:
         style (StyleType, optional): Optional background style. Defaults to None.
     """
 
+    renderable: "RenderableType"
+
     def __init__(
         self,
         *renderables: "RenderableType",
diff --git a/rich/segment.py b/rich/segment.py
index 094a7b25..62197a1c 100644
--- a/rich/segment.py
+++ b/rich/segment.py
@@ -7,7 +7,11 @@ from .style import Style
 
 from itertools import filterfalse
 from operator import attrgetter
-from typing import Iterable, List, Sequence, Union, Tuple
+from typing import Iterable, List, Sequence, Union, Tuple, TYPE_CHECKING
+
+
+if TYPE_CHECKING:
+    from .console import Console, ConsoleOptions, RenderResult
 
 
 class ControlType(IntEnum):
@@ -404,6 +408,30 @@ class Segment(NamedTuple):
                 yield cls(text, None, control)
 
 
+class Segments:
+    """A simple renderable to render an iterable of segments.
+
+    Args:
+        segments (Iterable[Segment]): An iterable of segments.
+        new_lines (bool, optional): Add new lines between segments. Defaults to False.
+    """
+
+    def __init__(self, segments: Iterable[Segment], new_lines: bool = False) -> None:
+        self.segments = list(segments)
+        self.new_lines = new_lines
+
+    def __rich_console__(
+        self, console: "Console", options: "ConsoleOptions"
+    ) -> "RenderResult":
+        if self.new_lines:
+            line = Segment.line()
+            for segment in self.segments:
+                yield segment
+                yield line
+        else:
+            yield from self.segments
+
+
 if __name__ == "__main__":  # pragma: no cover
     from rich.syntax import Syntax
     from rich.text import Text
diff --git a/rich/tui/app.py b/rich/tui/app.py
index 207bde67..58629e24 100644
--- a/rich/tui/app.py
+++ b/rich/tui/app.py
@@ -4,8 +4,8 @@ import logging
 import signal
 from typing import Any, Dict, Set
 
-from rich.live import Live
 from rich.control import Control
+from rich.repr import rich_repr, RichReprResult
 from rich.screen import Screen
 
 from . import events
@@ -22,23 +22,27 @@ log = logging.getLogger("rich")
 LayoutDefinition = Dict[str, Any]
 
 
+@rich_repr
 class App(MessagePump):
+    view: View
+
     def __init__(
         self,
         console: Console = None,
         view: View = None,
         screen: bool = True,
-        auto_refresh=4,
         title: str = "Megasoma Application",
     ):
         super().__init__()
         self.console = console or get_console()
         self._screen = screen
-        self._auto_refresh = auto_refresh
         self.title = title
         self.view = view or LayoutView()
         self.children: Set[MessagePump] = set()
 
+    def __rich_repr__(self) -> RichReprResult:
+        yield "title", self.title
+
     @classmethod
     def run(cls, console: Console = None, screen: bool = True):
         async def run_app() -> None:
@@ -99,8 +103,6 @@ class App(MessagePump):
 if __name__ == "__main__":
     import asyncio
     from logging import FileHandler
-    from rich.layout import Layout
-    from rich.panel import Panel
 
     from .widgets.header import Header
 
diff --git a/rich/tui/events.py b/rich/tui/events.py
index fd9e7ccc..975c803d 100644
--- a/rich/tui/events.py
+++ b/rich/tui/events.py
@@ -136,7 +136,7 @@ class Timer(Event, type=EventType.TIMER, priority=10):
         self.callback = callback
 
     def __rich_repr__(self) -> RichReprResult:
-        yield "timer", self.timer
+        yield self.timer.name
 
 
 class Focus(Event, type=EventType.FOCUS):
diff --git a/rich/tui/manager.py b/rich/tui/manager.py
deleted file mode 100644
index cd4173b8..00000000
--- a/rich/tui/manager.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from rich.layout import Layout
-
-
-class LayoutManager:
-    def __init__(self) -> None:
-        self.layout = Layout()
\ No newline at end of file
diff --git a/rich/tui/message_pump.py b/rich/tui/message_pump.py
index 90ccc1cc..a271f412 100644
--- a/rich/tui/message_pump.py
+++ b/rich/tui/message_pump.py
@@ -105,7 +105,7 @@ class MessagePump:
             except Exception:
                 log.exception("error getting message")
                 break
-            log.debug(repr(message))
+            log.debug("%r -> %r", message, self)
             await self.dispatch_message(message, priority)
 
     async def dispatch_message(self, message: Message, priority: int) -> Optional[bool]:
@@ -150,16 +150,3 @@ class MessagePump:
     async def on_timer(self, event: events.Timer) -> None:
         if event.callback is not None:
             await event.callback()
-
-
-if __name__ == "__main__":
-
-    class Widget(MessagePump):
-        pass
-
-    widget1 = Widget()
-    widget2 = Widget()
-
-    import asyncio
-
-    asyncio.get_event_loop().run_until_complete(widget1.run_message_loop())
\ No newline at end of file
diff --git a/rich/tui/scrollbar.py b/rich/tui/scrollbar.py
new file mode 100644
index 00000000..9a8d4a18
--- /dev/null
+++ b/rich/tui/scrollbar.py
@@ -0,0 +1,85 @@
+from typing import List, Optional
+
+from rich.segment import Segment
+from rich.style import Style
+
+
+def render_bar(
+    height: int = 25,
+    size: float = 100,
+    window_size: float = 25,
+    position: float = 0,
+    bar_style: Optional[Style] = None,
+    back_style: Optional[Style] = None,
+    ascii_only: bool = False,
+    vertical: bool = True,
+) -> List[Segment]:
+    if vertical:
+        if ascii_only:
+            solid = "|"
+            half_start = "|"
+            half_end = "|"
+        else:
+            solid = "┃"
+            half_start = "╻"
+            half_end = "╹"
+    else:
+        if ascii_only:
+            solid = "-"
+            half_start = "-"
+            half_end = "-"
+        else:
+            solid = "━"
+            half_start = "╺"
+            half_end = "╸"
+
+    _bar_style = bar_style or Style.parse("bright_magenta")
+    _back_style = back_style or Style.parse("#555555")
+
+    _Segment = Segment
+
+    start_bar_segment = _Segment(half_start, _bar_style)
+    end_bar_segment = _Segment(half_end, _bar_style)
+    bar_segment = _Segment(solid, _bar_style)
+
+    start_back_segment = _Segment(half_end, _back_style)
+    end_back_segment = _Segment(half_end, _back_style)
+    back_segment = _Segment(solid, _back_style)
+
+    segments = [back_segment] * height
+
+    step_size = size / height
+
+    start = position / step_size
+    end = (position + window_size) / step_size
+
+    start_index = int(start)
+    end_index = int(end)
+    bar_height = (end_index - start_index) + 1
+
+    segments[start_index:end_index] = [bar_segment] * bar_height
+
+    sub_position = start % 1.0
+    if sub_position >= 0.5:
+        segments[start_index] = start_bar_segment
+    elif start_index:
+        segments[start_index - 1] = end_back_segment
+
+    sub_position = end % 1.0
+    if sub_position < 0.5:
+        segments[end_index] = end_bar_segment
+    elif end_index + 1 < len(segments):
+        segments[end_index + 1] = start_back_segment
+
+    return segments
+
+
+if __name__ == "__main__":
+    from rich.console import Console
+    from rich.segment import Segments
+
+    console = Console()
+
+    bar = render_bar(height=20, position=10, vertical=False, ascii_only=False)
+
+    console.print(Segments(bar, new_lines=False))
diff --git a/rich/tui/view.py b/rich/tui/view.py
index 807e5bc6..7de89dac 100644
--- a/rich/tui/view.py
+++ b/rich/tui/view.py
@@ -1,8 +1,9 @@
+from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING
 
-from rich.console import Console, RenderableType
+from rich.console import Console, ConsoleOptions, RenderResult, RenderableType
 from rich.layout import Layout
-from rich.live import Live
+from rich.repr import rich_repr, RichReprResult
 
 from . import events
 from ._context import active_app
@@ -14,7 +15,8 @@ if TYPE_CHECKING:
     from .app import App
 
 
-class View(MessagePump):
+@rich_repr
+class View(ABC, MessagePump):
     @property
     def app(self) -> "App":
         return active_app.get()
@@ -23,16 +25,34 @@ class View(MessagePump):
     def console(self) -> Console:
         return active_app.get().console
 
+    def __rich_console__(
+        self, console: Console, options: ConsoleOptions
+    ) -> RenderResult:
+        return
+        yield
+
+    def __rich_repr__(self) -> RichReprResult:
+        return
+        yield
+
     async def on_resize(self, event: events.Resize) -> None:
         pass
 
+    @abstractmethod
+    async def mount(self, widget: Widget, *, slot: str = "main") -> None:
+        ...
+
 
 class LayoutView(View):
     layout: Layout
 
     def __init__(
-        self, layout: Layout = None, title: str = "Layout Application"
+        self,
+        layout: Layout = None,
+        name: str = "default",
+        title: str = "Layout Application",
     ) -> None:
+        self.name = name
         self.title = title
         if layout is None:
             layout = Layout()
@@ -49,6 +69,9 @@ class LayoutView(View):
         self.layout = layout
         super().__init__()
 
+    def __rich_repr__(self) -> RichReprResult:
+        yield "name", self.name
+
     def __rich__(self) -> RenderableType:
         return self.layout
 
diff --git a/rich/tui/widgets/window.py b/rich/tui/widgets/window.py
new file mode 100644
index 00000000..98595232
--- /dev/null
+++ b/rich/tui/widgets/window.py
@@ -0,0 +1,14 @@
+from typing import Optional
+
+from rich.console import RenderableType
+from ..widget import Widget
+
+
+class Window(Widget):
+    renderable: Optional[RenderableType]
+
+    def __init__(self, renderable: RenderableType):
+        self.renderable = renderable
+
+    def update(self, renderable: RenderableType) -> None:
+        self.renderable = renderable
\ No newline at end of file