4 files changed, 63 insertions, 3 deletions

diff --git a/pointless/viewer/screen.js b/pointless/viewer/screen.js
index 0c1c3ad..28f4f55 100644
--- a/pointless/viewer/screen.js
+++ b/pointless/viewer/screen.js
@@ -8,7 +8,7 @@
 "use strict";
 
 class Screen {
-  constructor(window, secondary=false) {
+  constructor(window, secondary=false, withTimer=false) {
     this.window = window;
     this.secondary = secondary;
     this.canvas = window.document.getElementById("screen");
@@ -19,11 +19,18 @@ class Screen {
     this.window.addEventListener("resize", function() {
       self._refreshPage();
     });
+
+    this.timer = withTimer ? new Timer(window) : null;
+    this.pageTurnCount = 0;
   }
 
   setPage(page) {
+    if (this.pageTurnCount === 1 && this.timer != null)
+      this.timer.start();
+
     this.page = page;
     this._refreshPage();
+    this.pageTurnCount++;
   }
 
   _resizeScreen(ratio) {
diff --git a/pointless/viewer/stage.js b/pointless/viewer/stage.js
index 8c36981..68fdb45 100644
--- a/pointless/viewer/stage.js
+++ b/pointless/viewer/stage.js
@@ -17,8 +17,8 @@ class Stage {
 
     var self = this;
     this.projector.addEventListener("load", function() {
-      self.audienceScreen = new Screen(self.projector, false);
-      self.presenterScreen = new Screen(window, true);
+      self.audienceScreen = new Screen(self.projector, false, false);
+      self.presenterScreen = new Screen(window, true, true);
       onReady();
     });
 
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);
+  }
+}
diff --git a/pointless/viewer/viewer.css b/pointless/viewer/viewer.css
index dee9802..14db376 100644
--- a/pointless/viewer/viewer.css
+++ b/pointless/viewer/viewer.css
@@ -17,3 +17,19 @@ body {
   left: 50%;
   transform: translateX(-50%) translateY(-50%);
 }
+
+.notification {
+    position: absolute;
+  bottom: 0;
+  left: 50%;
+  transform: translateX(-50%);
+  padding: 0.5rem 1rem;
+  border-radius: 1rem 1rem 0 0;
+  background-color: black;
+  font-family: sans-serif;
+  font-size: 1.6rem;
+}
+
+.notification:empty {
+  display: none;
+}