From 193af24a56af08b1b0d5a852ed0e013c5ffcd676 Mon Sep 17 00:00:00 2001
From: William Toohey <will@mon.im>
Date: Sat, 19 Mar 2016 17:57:33 +1000
Subject: [PATCH] Warn for unsaved editor changes

---
 src/js/HuesEditor.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/js/HuesEditor.js b/src/js/HuesEditor.js
index 84fbc99..4fcde42 100644
--- a/src/js/HuesEditor.js
+++ b/src/js/HuesEditor.js
@@ -1091,6 +1091,8 @@ HuesEditor.prototype.setText = function(editor, text, caretFromEnd) {
     if(commitUndo) {
         this.commitUndo();
     }
+    // Make sure you can't accidentally close the tab
+    window.onbeforeunload = this.confirmLeave;
     this.song[editor._rhythm] = text;
     this.reflow(editor, this.song[editor._rhythm]);
     this.setCaret(editor._beatmap, caret);
@@ -1278,6 +1280,10 @@ HuesEditor.prototype.drawOneWave = function(wave, center, width) {
     } catch(e) {}
 };
 
+HuesEditor.prototype.confirmLeave = function() {
+    return "Unsaved beatmap - leave anyway?";
+}
+
 HuesEditor.prototype.alert = function(msg) {
     this.statusMsg.classList.remove("fade");
     this.statusMsg.textContent = msg;
@@ -1329,6 +1335,8 @@ HuesEditor.prototype.saveXML = function() {
     element.click();
 
     document.body.removeChild(element);
+    
+    window.onbeforeunload = null;
 };
 
 // http://stackoverflow.com/a/30810322