1 files changed, 48 insertions, 0 deletions

diff --git a/beamer/viewer/screen/timer.js b/beamer/viewer/screen/timer.js
new file mode 100644
index 0000000..a04ea63
--- /dev/null
+++ b/beamer/viewer/screen/timer.js
@@ -0,0 +1,48 @@
+/*
+ * Beamer Viewer, a web-based PDF presentation viewer
+ * Copyright (C) 2018 Pacien TRAN-GIRARD
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+"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();
+
+    const self = this;
+    setInterval(function() {
+      self._runTimer();
+    }, 1000);
+  }
+
+  _runTimer() {
+    const timeDelta = Math.floor((Date.now() - this.startTime) / 1000);
+    this._setDisplay(timeDelta);
+  }
+
+  _setDisplay(seconds) {
+    const dateObj = new Date(null);
+    dateObj.setSeconds(seconds);
+    this.display.textContent = dateObj.toISOString().substr(11, 8);
+  }
+}