Add files via upload

Author: GoSubRoutine

codebase/Mario.bat

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+start "" http://ProcessingJS.NihongoResources.com/test/PjsGameEngine/

codebase/canvasFocus.js

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+"use strict";
+
+document.addEventListener('DOMContentLoaded', () => {
+  const canvas = document.querySelector('canvas');
+
+  canvas.addEventListener('focus', function () { // while focussed, play sketch
+    const sketch = Processing.getInstanceById(this.id);
+    if (sketch)  sketch.loop(), sketch.unmute();
+  });
+
+  canvas.addEventListener('blur', function () { // when focus's lost, pause sketch
+    const sketch = Processing.getInstanceById(this.id);
+    if (sketch)  sketch.noLoop(), sketch.mute();
+  });
+});