allow for images in random order

README.md

@@ -94,6 +94,7 @@ The following properties can be configured:
 | `fadeTime`           | The fading time between two images.                                                                                                                                  |
 | `interval`           | The time that an image is shown.                                                                                                                                     |
 | `imageCount`         | Defines how many different images are shown in the slideshow.                                                                                                        |
+| `randomOrder`        | When set to true, Teleframe will show pictures in random order.                                                                                                      |
 | `autoDeleteImages`   | Defines if old images should be deleted, when they are no longer used in the slideshow (see 'imageCount'). Starred images will not be deleted.                       |
 | `showSender`         | When set to true, TeleFrame will show the name of the sender when the image is shown.                                                                                |
 | `showCaption`        | When set to true, TeleFrame will show the caption of the image when the image is shown.                                                                              |

js/defaultConfig.js

@@ -50,6 +50,9 @@ var defaultConfig = {
   // Defines how many different images are shown in the slideshow.
   imageCount: 30,
 
+  // When set to true, Teleframe will show pictures in random order.
+  randomOrder: true,
+
   // Defines if old images are deleted, when they are no longer used in the slideshow (see 'imageCount'). Starred images will not be deleted.
   autoDeleteImages: true,
 

js/renderer.js

@@ -41,6 +41,9 @@ var touchBarElements = {
   "reboot": new TouchBarElement("fas fa-redo-alt", reboot),
 }
 
+// keep track of shown images per sequence for no repeat in random order
+var shownSequence = [];
+
 
 // configure sound notification sound
 if (config.playSoundOnRecieve !== false) {
@@ -606,13 +609,27 @@ function loadImage(isNext, fadeTime, goToLatest = false) {
   }
 
   // get image path and increase currentImageIndex for next image
+
   if (goToLatest) {
     currentImageIndex = 0;
   } else if (isNext) {
-    if (currentImageIndex >= images.length - 1) {
-      currentImageIndex = 0;
+    if (!config.randomOrder) {
+    // select next picture
+        if (currentImageIndex >= images.length - 1) {
+          currentImageIndex = 0;
+        } else {
+          currentImageIndex++;
+        }
     } else {
-      currentImageIndex++;
+    // select random picture
+        if (shownSequence.length >= images.length) {
+            shownSequence = [];
+        }
+        do {
+            next = Math.floor(Math.random() * images.length);
+        } while  (shownSequence.includes(next));
+        shownSequence.push(next);
+        currentImageIndex = next;
     }
   } else {
     currentImageIndex--;
@@ -749,8 +766,8 @@ function newImage(sender, type, newImageArray) {
     timer: 5000,
     icon: "success"
   }).then((value) => {
-    currentImageIndex = images.length;
-    loadImage(true, 0);
+    currentImageIndex = 0;
+    loadImage(false, 0, true);
   });
 }