Rework radar system

python_app/gui/runtime/pipeline_pause.py

@@ -0,0 +1,31 @@
+"""Exclusive pipeline pause held until a synchronous or asynchronous operation ends."""
+
+from __future__ import annotations
+
+from collections.abc import Callable
+
+
+class PipelinePause:
+    """Suspend acquisition and restart intent; an explicit Stop cancels resumption."""
+
+    def __init__(self, valid: Callable[[], bool], release: Callable[[bool], None]) -> None:
+        self._valid = valid
+        self._release = release
+        self._finished = False
+
+    @property
+    def valid(self) -> bool:
+        return not self._finished and self._valid()
+
+    def finish(self, *, resume: bool = True) -> None:
+        if self._finished:
+            return
+        should_resume = resume and self.valid
+        self._finished = True
+        self._release(should_resume)
+
+    def __enter__(self) -> PipelinePause:
+        return self
+
+    def __exit__(self, *_exc: object) -> None:
+        self.finish()