From 79ab2fcb7281005a059d3e0e7ace3534e0323229 Mon Sep 17 00:00:00 2001
From: Paul Kaplan <pkaplan@media.mit.edu>
Date: Thu, 2 Aug 2018 10:00:21 -0400
Subject: [PATCH] Add turbo mode events

---
 src/engine/runtime.js        | 16 ++++++++++++++++
 src/virtual-machine.js       |  5 +++++
 test/unit/virtual-machine.js | 21 +++++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 403768e0c..9a4ed3972 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -322,6 +322,22 @@ class Runtime extends EventEmitter {
         return 'BLOCK_GLOW_OFF';
     }
 
+    /**
+     * Event name for turning on turbo mode.
+     * @const {string}
+     */
+    static get TURBO_MODE_ON () {
+        return 'TURBO_MODE_ON';
+    }
+
+    /**
+     * Event name for turning off turbo mode.
+     * @const {string}
+     */
+    static get TURBO_MODE_OFF () {
+        return 'TURBO_MODE_OFF';
+    }
+
     /**
      * Event name when the project is started (threads may not necessarily be
      * running).
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index a42bee1ad..b1b186972 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -148,6 +148,11 @@ class VirtualMachine extends EventEmitter {
      */
     setTurboMode (turboModeOn) {
         this.runtime.turboMode = !!turboModeOn;
+        if (this.runtime.turboMode) {
+            this.emit(Runtime.TURBO_MODE_ON);
+        } else {
+            this.emit(Runtime.TURBO_MODE_OFF);
+        }
     }
 
     /**
diff --git a/test/unit/virtual-machine.js b/test/unit/virtual-machine.js
index 570a850e0..0310da046 100644
--- a/test/unit/virtual-machine.js
+++ b/test/unit/virtual-machine.js
@@ -857,3 +857,24 @@ test('shareBlocksToTarget chooses a fresh name for a new global variable checkin
 
     t.end();
 });
+
+test('Setting turbo mode emits events', t => {
+    let turboMode = null;
+
+    const vm = new VirtualMachine();
+
+    vm.addListener('TURBO_MODE_ON', () => {
+        turboMode = true;
+    });
+    vm.addListener('TURBO_MODE_OFF', () => {
+        turboMode = false;
+    });
+
+    vm.setTurboMode(true);
+    t.equal(turboMode, true);
+
+    vm.setTurboMode(false);
+    t.equal(turboMode, false);
+
+    t.end();
+});