fix issue #20: add shortcut to open and to hide the menu

templates/js/script.php

@@ -28,6 +28,18 @@
         var headerMenuOpener = $('#header .side-menu-opener')
         var sideMenuOpener = $('#side-menu .side-menu-opener')
 
+        sideMenuFocus = function() {
+            var a = sideMenu.find('.side-menu-app.active a')
+
+            if (a.length === 0) {
+                a = sideMenu.find('.side-menu-app:first-child a')
+            }
+
+            if (a.length > 0) {
+                a.focus()
+            }
+        }
+
         <?php if ($_['opener-hover']): ?>
             var sideMenuMouseLeave = function() {
                 sideMenu
@@ -43,6 +55,8 @@
                 sideMenu
                     .addClass('open')
                     .on('mouseenter', sideMenuMouseEnter)
+
+                sideMenuFocus()
             }
 
             if (!isTouchDevice) {
@@ -53,11 +67,23 @@
         <?php endif; ?>
 
         headerMenuOpener.on('click', function() {
-            sideMenu.addClass('open');
+            sideMenu.addClass('open')
+            sideMenu.find('.side-menu-app.active a').focus()
         })
 
         sideMenuOpener.on('click', function() {
-            sideMenu.removeClass('open');
+            sideMenu.removeClass('open')
+        })
+
+        $(document).keydown(function(e) {
+            var key = e.key || e.keyCode
+
+            if ((key === 'o' || key === 79) && e.ctrlKey === true) {
+                e.preventDefault()
+
+                sideMenu.toggleClass('open')
+                sideMenuFocus()
+            }
         })
     })
 

templates/settings/admin-form.php

@@ -213,6 +213,9 @@ $choicesSizes = [
             </select>
         </div>
 
+        <p>Use the shortcut <span class="keyboard-key">Ctrl</span>+<span class="keyboard-key">o</span> 
+         to open and to hide the side menu. Use <span class="keyboard-key">tab</span> to navigate.</p>
+
         <div>
             <label for="side-menu-opener" class="settings-hint">
                 <?php p($l->t('Display the logo')); ?>
@@ -271,6 +274,15 @@ $choicesSizes = [
         </div>
     </div>
 
+    <div class="section">
+        <h2>
+            <?php p($l->t('Tips')); ?>
+        </h2>
+
+        <p class="settings-hint">Use the shortcut <span class="keyboard-key">Ctrl</span>+<span class="keyboard-key">o</span> 
+         to open and to hide the side menu. Use <span class="keyboard-key">tab</span> to navigate.</p>
+    </div>
+
     <div class="section">
         <input type="hidden" id="side-menu-cache" name="cache" value="<?php print_unescaped($_['cache']); ?>" class="side-menu-setting">
 

templates/settings/personal-form.php

@@ -48,6 +48,9 @@ $choicesYesNo = [
                 <?php endforeach; ?>
             </select>
         </div>
+
+        <p>Use the shortcut <span class="keyboard-key">Ctrl</span>+<span class="keyboard-key">o</span> 
+         to open and to hide the side menu. Use <span class="keyboard-key">tab</span> to navigate.</p>
     </div>
 
     <div class="section">