From 8a450d43030d40777ce5708f1dfb525946b1b2fd Mon Sep 17 00:00:00 2001
From: Will McGugan <willmcgugan@gmail.com>
Date: Tue, 11 Oct 2022 15:40:41 +0100
Subject: [PATCH] add max_idle for screen

---
 src/textual/message_pump.py | 10 +++++++++-
 src/textual/screen.py       |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/textual/message_pump.py b/src/textual/message_pump.py
index d6b6ecf6b..d937a0239 100644
--- a/src/textual/message_pump.py
+++ b/src/textual/message_pump.py
@@ -10,6 +10,7 @@ from __future__ import annotations
 import asyncio
 import inspect
 from asyncio import CancelledError, Queue, QueueEmpty, Task
+from time import time
 from functools import partial
 from typing import TYPE_CHECKING, Any, Awaitable, Callable, Iterable
 from weakref import WeakSet
@@ -75,6 +76,8 @@ class MessagePump(metaclass=MessagePumpMeta):
         self._pending_message: Message | None = None
         self._task: Task | None = None
         self._timers: WeakSet[Timer] = WeakSet()
+        self._last_idle: float = time()
+        self._max_idle: float | None = None
 
     @property
     def task(self) -> Task:
@@ -337,7 +340,12 @@ class MessagePump(metaclass=MessagePumpMeta):
                 break
             finally:
                 self._message_queue.task_done()
-                if self._message_queue.empty():
+                current_time = time()
+                if self._message_queue.empty() or (
+                    self._max_idle is not None
+                    and current_time - self._last_idle > self._max_idle
+                ):
+                    self._last_idle = current_time
                     if not self._closed:
                         event = events.Idle(self)
                         for _cls, method in self._get_dispatch_methods(
diff --git a/src/textual/screen.py b/src/textual/screen.py
index 39780d5b9..dd8c78cfd 100644
--- a/src/textual/screen.py
+++ b/src/textual/screen.py
@@ -51,6 +51,7 @@ class Screen(Widget):
         self._dirty_widgets: set[Widget] = set()
         self._update_timer: Timer | None = None
         self._callbacks: list[CallbackType] = []
+        self._max_idle = UPDATE_PERIOD
 
     @property
     def is_transparent(self) -> bool: