From 74764bf744759f563ebbe9bd96dc0ba282c0ff45 Mon Sep 17 00:00:00 2001
From: Ivan Kosarev <ivan@kosarev.info>
Date: Sun, 28 Feb 2021 16:42:36 +0200
Subject: [PATCH] [#20] Get tape levels with events.

---
 zx/_device.py   | 5 +++++
 zx/_emulator.py | 4 ++--
 zx/_tape.py     | 3 +++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/zx/_device.py b/zx/_device.py
index 7b84c73..5490ede 100644
--- a/zx/_device.py
+++ b/zx/_device.py
@@ -27,6 +27,11 @@ class GetEmulationTime(DeviceEvent):
     pass
 
 
+class GetTapeLevel(DeviceEvent):
+    def __init__(self, frame_tick):
+        self.frame_tick = frame_tick
+
+
 # TODO: Combine these into Get/SetState kind of events.
 class GetTapePlayerTime(DeviceEvent):
     pass
diff --git a/zx/_emulator.py b/zx/_emulator.py
index 4bce45c..d46ac98 100644
--- a/zx/_emulator.py
+++ b/zx/_emulator.py
@@ -13,6 +13,7 @@
 from ._data import MachineSnapshot
 from ._data import SoundFile
 from ._device import EndOfFrame
+from ._device import GetTapeLevel
 from ._device import PauseStateUpdated
 from ._device import QuantumRun
 from ._device import ScreenUpdated
@@ -168,8 +169,7 @@ def __on_input(self, addr):
         # TODO: Use the tick when the ear value is sampled
         #       instead of the tick of the beginning of the input
         #       cycle.
-        tick = self.ticks_since_int
-        if self._tape_player.get_level_at_frame_tick(tick):
+        if self.devices.notify(GetTapeLevel(self.ticks_since_int)):
             n |= 0x40
 
         END_OF_TAPE = RunEvents.END_OF_TAPE
diff --git a/zx/_tape.py b/zx/_tape.py
index ef4654e..0c0adc2 100644
--- a/zx/_tape.py
+++ b/zx/_tape.py
@@ -11,6 +11,7 @@
 
 from ._device import Device
 from ._device import EndOfFrame
+from ._device import GetTapeLevel
 from ._time import Time
 
 
@@ -172,4 +173,6 @@ def skip_rest_of_frame(self):
     def on_event(self, event, devices, result):
         if isinstance(event, EndOfFrame):
             self.skip_rest_of_frame()
+        elif isinstance(event, GetTapeLevel):
+            return self.get_level_at_frame_tick(event.frame_tick)
         return result