From b6955ee9aa0058f64f6e3b6314d2b7358939bc2e Mon Sep 17 00:00:00 2001
From: David Gay <david@davidgay.org>
Date: Mon, 7 Jun 2021 21:00:17 -0400
Subject: Implement web worker to keep timer running even when page is inactive

---
 public/timer_worker.js | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 public/timer_worker.js

(limited to 'public')

diff --git a/public/timer_worker.js b/public/timer_worker.js
new file mode 100644
index 0000000..3d3e79a
--- /dev/null
+++ b/public/timer_worker.js
@@ -0,0 +1,24 @@
+let timerInterval = null;
+
+function setTimerInterval() {
+  if (!timerInterval) {
+    timerInterval = setInterval(function() {
+      postMessage("timerTick");
+    }, 10);
+  }
+}
+
+function clearTimerInterval() {
+  clearInterval(timerInterval);
+  timerInterval = null;
+}
+
+onmessage = function(event) {
+  if ("run_flag" in event.data) {
+    if (event.data["run_flag"]) {
+      setTimerInterval();
+    } else {
+      clearTimerInterval();
+    }
+  }
+}
-- 
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