Add timer

1 files changed, 37 insertions, 0 deletions

diff --git a/pointless/viewer/timer.js b/pointless/viewer/timer.js
new file mode 100644
index 0000000..4f19986
--- /dev/null
+++ b/pointless/viewer/timer.js
@@ -0,0 +1,37 @@
+/*
+ * timer.js
+ * Part of Pointless Viewer, a Beamer presentation viewer
+ * Copyright 2018 Pacien TRAN-GIRARD
+ * License: GNU GPL v3
+ */
+
+"use strict";
+
+class Timer {
+  constructor(window) {
+    this.display = window.document.getElementById("timer");
+    this.startTime = null;
+    this._setDisplay(0);
+  }
+
+  start() {
+    if (this.startTime != null) return;
+    this.startTime = Date.now();
+
+    var self = this;
+    setInterval(function() {
+      self._runTimer();
+    }, 1000);
+  }
+
+  _runTimer() {
+    var timeDelta = Math.floor((Date.now() - this.startTime) / 1000);
+    this._setDisplay(timeDelta);
+  }
+
+  _setDisplay(seconds) {
+    var dateObj = new Date(null);
+    dateObj.setSeconds(seconds);
+    this.display.textContent = dateObj.toISOString().substr(11, 8);
+  }
+}