move focus-via-up/down cursors to LeftPanel

src/components/structures/LeftPanel.js

@@ -16,17 +16,16 @@ limitations under the License.
 
 'use strict';
 
-var React = require('react');
-var DragDropContext = require('react-dnd').DragDropContext;
-var HTML5Backend = require('react-dnd-html5-backend');
-var sdk = require('matrix-react-sdk')
-var dis = require('matrix-react-sdk/lib/dispatcher');
+import React from 'react';
+import { DragDropContext } from 'react-dnd';
+import HTML5Backend from 'react-dnd-html5-backend';
+import KeyCode from 'matrix-react-sdk/lib/KeyCode';
+import sdk from 'matrix-react-sdk';
+import dis from 'matrix-react-sdk/lib/dispatcher';
 import MatrixClientPeg from 'matrix-react-sdk/lib/MatrixClientPeg';
-
-var VectorConferenceHandler = require('../../VectorConferenceHandler');
-var CallHandler = require("matrix-react-sdk/lib/CallHandler");
-
+import CallHandler from 'matrix-react-sdk/lib/CallHandler';
 import AccessibleButton from 'matrix-react-sdk/lib/components/views/elements/AccessibleButton';
+import VectorConferenceHandler from '../../VectorConferenceHandler';
 
 var LeftPanel = React.createClass({
     displayName: 'LeftPanel',
@@ -42,6 +41,10 @@ var LeftPanel = React.createClass({
         };
     },
 
+    componentWillMount: function() {
+        this.focusedElement = null;
+    },
+
     componentDidMount: function() {
         this.dispatcherRef = dis.register(this.onAction);
     },
@@ -64,6 +67,91 @@ var LeftPanel = React.createClass({
         }
     },
 
+    _onFocus: function(ev) {
+        this.focusedElement = ev.target;
+    },
+
+    _onBlur: function(ev) {
+        this.focusedElement = null;
+    },
+
+    _onKeyDown: function(ev) {
+        if (!this.focusedElement) return;
+        let handled = false;
+
+        switch (ev.keyCode) {
+            case KeyCode.UP:
+                this._onMoveFocus(true);
+                handled = true;
+                break;
+            case KeyCode.DOWN:
+                this._onMoveFocus(false);
+                handled = true;
+                break;
+        }
+
+        if (handled) {
+            ev.stopPropagation();
+            ev.preventDefault();
+        }
+    },
+
+    _onMoveFocus: function(up) {
+        var element = this.focusedElement;
+
+        // unclear why this isn't needed
+        // var descending = (up == this.focusDirection) ? this.focusDescending : !this.focusDescending;
+        // this.focusDirection = up;
+
+        var descending = false; // are we currently descending or ascending through the DOM tree?
+        var classes;
+
+        do {
+            var child = up ? element.lastElementChild : element.firstElementChild;
+            var sibling = up ? element.previousElementSibling : element.nextElementSibling;
+
+            if (descending) {
+                if (child) {
+                    element = child;
+                }
+                else if (sibling) {
+                    element = sibling;
+                }
+                else {
+                    descending = false;
+                    element = element.parentElement;
+                }
+            }
+            else {
+                if (sibling) {
+                    element = sibling;
+                    descending = true;
+                }
+                else {
+                    element = element.parentElement;
+                }
+            }
+
+            if (element) {
+                classes = element.classList;
+                if (classes.contains("mx_LeftPanel")) { // we hit the top
+                    element = up ? element.lastElementChild : element.firstElementChild;
+                    descending = true;
+                }
+            }
+
+        } while(element && !(
+            classes.contains("mx_RoomTile") ||
+            classes.contains("mx_SearchBox_search") ||
+            classes.contains("mx_RoomSubList_ellipsis")));
+
+        if (element) {
+            element.focus();
+            this.focusedElement = element;
+            this.focusedDescending = descending;
+        }
+    },
+
     _recheckCallElement: function(selectedRoomId) {
         // if we aren't viewing a room with an ongoing call, but there is an
         // active call, show the call element - we need to do this to make
@@ -126,7 +214,8 @@ var LeftPanel = React.createClass({
         }
 
         return (
-            <aside className={classes} style={{ opacity: this.props.opacity }}>
+            <aside className={classes} style={{ opacity: this.props.opacity }}
+                   onKeyDown={ this._onKeyDown } onFocus={ this._onFocus } onBlur={ this._onBlur }>
                 { topBox }
                 { callPreview }
                 <RoomList