From fc22f2e2ea3d12ac36096e1ec3ab4fe36f59b66f Mon Sep 17 00:00:00 2001
From: purocean <purocean@gmail.com>
Date: Wed, 12 Jan 2022 09:36:39 +0800
Subject: [PATCH] upd: handle onbeforeunload on electron for drawio editor

---
 src/renderer/plugins/markdown-drawio.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/renderer/plugins/markdown-drawio.ts b/src/renderer/plugins/markdown-drawio.ts
index 8aa6f1d7..5e926eb2 100644
--- a/src/renderer/plugins/markdown-drawio.ts
+++ b/src/renderer/plugins/markdown-drawio.ts
@@ -276,6 +276,12 @@ function buildEditorSrcdoc (file: Doc) {
         iframe.style.border = 'none'
         iframe.setAttribute('frameborder', '0')
 
+        ${isElectron ? `
+          window.onbeforeunload = evt => {
+            iframe.contentWindow.postMessage(JSON.stringify({ action: 'exit' }), '*');
+          }
+        ` : ''}
+
         const asPng = doc.path.endsWith('.png')
 
         const receive = async function (evt) {