From 7a50f7910e7996dedfa3231450f060dbcb247bdf Mon Sep 17 00:00:00 2001
From: Bulat Musin <b.musin@innopolis.ru>
Date: Mon, 5 Feb 2018 15:08:46 +0300
Subject: [PATCH] add support for F9 - toggle sidebar

---
 src/theme/book.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/theme/book.js b/src/theme/book.js
index fe3d17cb..f797e679 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -455,6 +455,26 @@ function playpen_text(playpen) {
         }
     }, { passive: true });
 
+    document.addEventListener('keydown', function (e) {
+        if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
+
+        switch (e.key) {
+            case 'F9':
+                if (html.classList.contains("sidebar-hidden")) {
+                    showSidebar();
+                } else if (html.classList.contains("sidebar-visible")) {
+                    hideSidebar();
+                } else {
+                    if (getComputedStyle(sidebar)['transform'] === 'none') {
+                        hideSidebar();
+                    } else {
+                        showSidebar();
+                    }
+                }
+                break;
+        }
+    });
+
     // Scroll sidebar to current active section
     var activeSection = sidebar.querySelector(".active");
     if (activeSection) {