/
host.tsx
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/
host.tsx
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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license.
//
// Microsoft Bot Framework: http://botframework.com
//
// Bot Framework Emulator Github:
// https://github.com/Microsoft/BotFramwork-Emulator
//
// Copyright (c) Microsoft Corporation
// All rights reserved.
//
// MIT License:
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED ""AS IS"", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
import * as React from 'react';
import { EventHandler, SyntheticEvent } from 'react';
import { DialogService } from '../service';
import * as styles from './host.scss';
export interface DialogHostProps {
showing?: boolean;
}
export class DialogHost extends React.Component<DialogHostProps, {}> {
private hostRef: React.RefObject<any>;
constructor(props) {
super(props);
this.hostRef = React.createRef();
}
public componentDidMount() {
this.hostRef.current && this.hostRef.current.addEventListener('dialogRendered', this.initFocusTrap);
DialogService.setHost(this.hostRef.current);
}
public componentWillUnmount() {
this.hostRef.current && this.hostRef.current.removeEventListener('dialogRendered', this.initFocusTrap);
}
public render() {
const visibilityClass = this.props.showing ? styles.dialogHostVisible : '';
// sentinels shouldn't be tab-able when dialog is hidden
const sentinelTabIndex = this.props.showing ? 0 : -1;
return (
<div className={`${styles.host} ${visibilityClass}`} onClick={this.handleOverlayClick}>
<span tabIndex={sentinelTabIndex} onFocus={this.onFocusStartingSentinel} className={styles.focusSentinel} />
<div className={styles.dialogHostContent} onClick={this.handleContentClick} ref={this.hostRef} />
<span tabIndex={sentinelTabIndex} onFocus={this.onFocusEndingSentinel} className={styles.focusSentinel} />
</div>
);
}
private handleOverlayClick: EventHandler<any> = (event: MouseEvent) => {
event.stopPropagation();
DialogService.hideDialog();
};
private handleContentClick: EventHandler<any> = (event: MouseEvent) => {
// need to stop clicks inside the dialog from bubbling up to the overlay
event.stopPropagation();
};
private getFocusableElementsInModal = (): any[] => {
if (this.hostRef.current) {
const result = [].filter.call(
this.hostRef.current.querySelectorAll('*'),
element => ~this.getTabIndex(element) && !element.hasAttribute('disabled')
);
return result;
}
return [];
};
private getTabIndex(element) {
const { tabIndex } = element;
if (!~tabIndex) {
const attr = element.getAttribute('tabindex');
if (attr === null) {
return -1;
}
}
return tabIndex;
}
private initFocusTrap = () => {
const allFocusableElements = this.getFocusableElementsInModal();
if (allFocusableElements.length) {
const firstElement: HTMLElement = allFocusableElements[1] as HTMLElement;
firstElement && firstElement.focus();
}
};
// Reached beginning of focusable items inside the modal host; re-focus the last item
private onFocusStartingSentinel = (e: SyntheticEvent<any>) => {
e.preventDefault();
const allFocusableElements = this.getFocusableElementsInModal();
const lastElement = allFocusableElements.pop();
lastElement && lastElement.focus();
};
// Reached end of focusable items inside the modal host; re-focus the first item
private onFocusEndingSentinel = (e: SyntheticEvent<any>) => {
e.preventDefault();
const allFocusableElements = this.getFocusableElementsInModal();
const firstElement = allFocusableElements[0];
firstElement && firstElement.focus();
};
}