Several changes improving accessibility of the dialogs

- Wrapped all the modals inside a react-focus-trap component disabling
keyboard navigation outside the modal dialogs
- Disabled our custom key handling at dialog level. Cancelling on esc
key is now handled via FocusTrap component.
- Removed onEnter prop from the BaseDialog component. Dialogs that
submit data all now embed a form with onSubmit handler. And since
keyboard focus is now managed better via FocusTrap it no longer makes
sense for the other dialog types. Fixes
https://github.com/vector-im/riot-web/issues/5736
- Set aria-hidden on the matrixChat outer node when showing dialogs to
disable navigating outside the modals by using screen reader specific
features.

package.json

@@ -78,6 +78,7 @@
     "react": "^15.4.0",
     "react-addons-css-transition-group": "15.3.2",
     "react-dom": "^15.4.0",
+    "react-focus-trap": "^2.5.0",
     "react-gemini-scrollbar": "matrix-org/react-gemini-scrollbar#5e97aef",
     "sanitize-html": "^1.14.1",
     "text-encoding-utf-8": "^1.0.1",

src/Modal.js

@@ -19,6 +19,7 @@ limitations under the License.
 
 const React = require('react');
 const ReactDOM = require('react-dom');
+import FocusTrap from 'react-focus-trap';
 import Analytics from './Analytics';
 import sdk from './index';
 
@@ -164,6 +165,7 @@ class ModalManager {
         );
         modal.onFinished = props ? props.onFinished : null;
         modal.className = className;
+        modal.closeDialog = closeDialog;
 
         this._modals.unshift(modal);
 
@@ -194,9 +196,9 @@ class ModalManager {
         const modal = this._modals[0];
         const dialog = (
             <div className={"mx_Dialog_wrapper " + (modal.className ? modal.className : '')}>
-                <div className="mx_Dialog">
+                <FocusTrap className="mx_Dialog" onExit={modal.closeDialog}>
                     { modal.elem }
-                </div>
+                </FocusTrap>
                 <div className="mx_Dialog_background" onClick={this.closeAll}></div>
             </div>
         );

src/components/views/dialogs/BaseDialog.js

@@ -33,9 +33,6 @@ export default React.createClass({
         // onFinished callback to call when Escape is pressed
         onFinished: React.PropTypes.func.isRequired,
 
-        // callback to call when Enter is pressed
-        onEnterPressed: React.PropTypes.func,
-
         // CSS class to apply to dialog div
         className: React.PropTypes.string,
 
@@ -51,17 +48,16 @@ export default React.createClass({
         contentId: React.PropTypes.string
     },
 
-    _onKeyDown: function(e) {
+    componentDidMount: function() {
-        if (e.keyCode === KeyCode.ESCAPE) {
+        this.applicationNode = document.getElementById('matrixchat');
-            e.stopPropagation();
+        if (this.applicationNode) {
-            e.preventDefault();
+            this.applicationNode.setAttribute('aria-hidden', 'true');
-            this.props.onFinished();
-        } else if (e.keyCode === KeyCode.ENTER) {
-            if (this.props.onEnterPressed) {
-                e.stopPropagation();
-                e.preventDefault();
-                this.props.onEnterPressed(e);
         }
+    },
+
+    componentWillUnmount: function() {
+        if (this.applicationNode) {
+            this.applicationNode.setAttribute('aria-hidden', 'false');
         }
     },
 
@@ -73,7 +69,7 @@ export default React.createClass({
         const TintableSvg = sdk.getComponent("elements.TintableSvg");
 
         return (
-            <div onKeyDown={this._onKeyDown} className={this.props.className} role="dialog" aria-labelledby='mx_BaseDialog_title' aria-describedby={this.props.contentId}>
+            <div className={this.props.className} role="dialog" aria-labelledby='mx_BaseDialog_title' aria-describedby={this.props.contentId}>
                 <AccessibleButton onClick={this._onCancelClick}
                     className="mx_Dialog_cancelButton"
                 >

src/components/views/dialogs/ConfirmUserActionDialog.js

@@ -116,10 +116,10 @@ export default React.createClass({
 
         return (
             <BaseDialog className="mx_ConfirmUserActionDialog" onFinished={this.props.onFinished}
-                onEnterPressed={this.onOk}
                 title={this.props.title}
+                contentId='mx_Dialog_content'
             >
-                <div className="mx_Dialog_content">
+                <div id="mx_Dialog_content" className="mx_Dialog_content">
                     <div className="mx_ConfirmUserActionDialog_avatar">
                         { avatar }
                     </div>

src/components/views/dialogs/CreateGroupDialog.js

@@ -116,7 +116,6 @@ export default React.createClass({
 
         return (
             <BaseDialog className="mx_CreateGroupDialog" onFinished={this.props.onFinished}
-                onEnterPressed={this._onFormSubmit}
                 title={_t('Create Community')}
             >
                 <form onSubmit={this._onFormSubmit}>

src/components/views/dialogs/CreateRoomDialog.js

@@ -43,9 +43,9 @@ export default React.createClass({
         const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
         return (
             <BaseDialog className="mx_CreateRoomDialog" onFinished={this.props.onFinished}
-                onEnterPressed={this.onOk}
                 title={_t('Create Room')}
             >
+                <form onSubmit={this.onOk}>
                     <div className="mx_Dialog_content">
                         <div className="mx_CreateRoomDialog_label">
                             <label htmlFor="textinput"> { _t('Room name (optional)') } </label>
@@ -71,10 +71,9 @@ export default React.createClass({
                         <button onClick={this.onCancel}>
                             { _t('Cancel') }
                         </button>
-                    <button className="mx_Dialog_primary" onClick={this.onOk}>
+                        <input type="submit" className="mx_Dialog_primary" value={ _t('Create Room') }/>
-                        { _t('Create Room') }
-                    </button>
                     </div>
+                </form>
             </BaseDialog>
         );
     },

src/components/views/dialogs/QuestionDialog.js

@@ -64,7 +64,6 @@ export default React.createClass({
         });
         return (
             <BaseDialog className="mx_QuestionDialog" onFinished={this.props.onFinished}
-                onEnterPressed={this.onOk}
                 title={this.props.title}
                 contentId='mx_Dialog_content'
             >

src/components/views/dialogs/TextInputDialog.js

@@ -60,9 +60,9 @@ export default React.createClass({
         const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
         return (
             <BaseDialog className="mx_TextInputDialog" onFinished={this.props.onFinished}
-                onEnterPressed={this.onOk}
                 title={this.props.title}
             >
+                <form onSubmit={this.onOk}>
                     <div className="mx_Dialog_content">
                         <div className="mx_TextInputDialog_label">
                             <label htmlFor="textinput"> { this.props.description } </label>
@@ -75,10 +75,9 @@ export default React.createClass({
                         <button onClick={this.onCancel}>
                             { _t("Cancel") }
                         </button>
-                    <button className="mx_Dialog_primary" onClick={this.onOk}>
+                        <input type="submit" className="mx_Dialog_primary" value={ this.props.button }/>
-                        { this.props.button }
-                    </button>
                     </div>
+                </form>
             </BaseDialog>
         );
     },