[Glitch] Fix and refactor keyboard navigation in dropdown menus

Port 80182eda62 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/dropdown_menu.js

@@ -68,20 +68,14 @@ class DropdownMenu extends React.PureComponent {
   handleKeyDown = e => {
     const items = Array.from(this.node.getElementsByTagName('a'));
     const index = items.indexOf(document.activeElement);
-    let element;
+    let element = null;
 
     switch(e.key) {
     case 'ArrowDown':
-      element = items[index+1];
-      if (element) {
-        element.focus();
-      }
+      element = items[index+1] || items[0];
       break;
     case 'ArrowUp':
-      element = items[index-1];
-      if (element) {
-        element.focus();
-      }
+      element = items[index-1] || items[items.length-1];
       break;
     case 'Tab':
       if (e.shiftKey) {
@@ -89,28 +83,23 @@ class DropdownMenu extends React.PureComponent {
       } else {
         element = items[index+1] || items[0];
       }
-      if (element) {
-        element.focus();
-        e.preventDefault();
-        e.stopPropagation();
-      }
       break;
     case 'Home':
       element = items[0];
-      if (element) {
-        element.focus();
-      }
       break;
     case 'End':
       element = items[items.length-1];
-      if (element) {
-        element.focus();
-      }
       break;
     case 'Escape':
       this.props.onClose();
       break;
     }
+
+    if (element) {
+      element.focus();
+      e.preventDefault();
+      e.stopPropagation();
+    }
   }
 
   handleItemKeyPress = e => {

app/javascript/flavours/glitch/features/compose/components/dropdown_menu.js

@@ -106,7 +106,7 @@ export default class ComposerOptionsDropdownContent extends React.PureComponent
     const index = items.findIndex(item => {
       return (item.name === name);
     });
-    let element;
+    let element = null;
 
     switch(e.key) {
     case 'Escape':
@@ -117,18 +117,10 @@ export default class ComposerOptionsDropdownContent extends React.PureComponent
       this.handleClick(e);
       break;
     case 'ArrowDown':
-      element = this.node.childNodes[index + 1];
-      if (element) {
-        element.focus();
-        this.handleChange(element.getAttribute('data-index'));
-      }
+      element = this.node.childNodes[index + 1] || this.node.firstChild;
       break;
     case 'ArrowUp':
-      element = this.node.childNodes[index - 1];
-      if (element) {
-        element.focus();
-        this.handleChange(element.getAttribute('data-index'));
-      }
+      element = this.node.childNodes[index - 1] || this.node.lastChild;
       break;
     case 'Tab':
       if (e.shiftKey) {
@@ -136,28 +128,21 @@ export default class ComposerOptionsDropdownContent extends React.PureComponent
       } else {
         element = this.node.childNodes[index + 1] || this.node.firstChild;
       }
-      if (element) {
-        element.focus();
-        this.handleChange(element.getAttribute('data-index'));
-        e.preventDefault();
-        e.stopPropagation();
-      }
       break;
     case 'Home':
       element = this.node.firstChild;
-      if (element) {
-        element.focus();
-        this.handleChange(element.getAttribute('data-index'));
-      }
       break;
     case 'End':
       element = this.node.lastChild;
-      if (element) {
-        element.focus();
-        this.handleChange(element.getAttribute('data-index'));
-      }
       break;
     }
+
+    if (element) {
+      element.focus();
+      this.handleChange(element.getAttribute('data-index'));
+      e.preventDefault();
+      e.stopPropagation();
+    }
   }
 
   setFocusRef = c => {