Basic implementations

js/MediaImageCollection.js

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+import InterfaceEvent from "./events/InterfaceEvent.js";
+import ImageLoadedEvent from "./events/ImageLoadedEvent";
+
+export default class MediaImageCollection
+{
+    constructor()
+    {
+        this.mediaImages = [];
+        this.numberImagesLoaded = 0;
+
+        window.addEventListener(
+            ImageLoadedEvent.NAME,
+            () => {
+                this.numberImagesLoaded++;
+
+                if (this.numberImagesLoaded === this.mediaImages.length) {
+                    window.dispatchEvent(new InterfaceEvent.MEDIA_COLLECTION_LOADED);
+                }
+            }
+        )
+    }
+
+    addMediaImage(mediaImage)
+    {
+        this.mediaImages.push(mediaImage);
+
+    }
+}