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import React, { useContext, useEffect, useMemo, useRef, useState } from 'react';
import ReactDOM from 'react-dom';
import styled from 'styled-components';
import { colors } from '../../config.json';
import log from '../../shared/logging';
import ImageView from './ImageView';
const MODAL_CONTAINER_ID = 'modal-container';
const ModalContent = styled.div({
position: 'absolute',
display: 'flex',
flexDirection: 'column',
flex: 1,
top: 0,
left: 0,
right: 0,
bottom: 0,
});
const ModalBackground = styled.div({
backgroundColor: 'rgba(0,0,0,0.5)',
position: 'absolute',
display: 'flex',
flexDirection: 'column',
flex: 1,
top: 0,
left: 0,
right: 0,
bottom: 0,
});
export const StyledModalContainer = styled.div({
position: 'relative',
flex: 1,
});
interface IModalContainerProps {
children?: React.ReactNode;
}
interface IModalContext {
activeModal: boolean;
setActiveModal: (value: boolean) => void;
previousActiveElement: React.MutableRefObject<HTMLElement | undefined>;
}
const noActiveModalContextError = new Error('ActiveModalContext.Provider missing');
const ActiveModalContext = React.createContext<IModalContext>({
get activeModal(): boolean {
throw noActiveModalContextError;
},
setActiveModal(_value) {
throw noActiveModalContextError;
},
get previousActiveElement(): React.MutableRefObject<HTMLElement | undefined> {
throw noActiveModalContextError;
},
});
export function ModalContainer(props: IModalContainerProps) {
const [activeModal, setActiveModal] = useState(false);
const previousActiveElement = useRef<HTMLElement>();
const contextValue = useMemo(
() => ({
activeModal,
setActiveModal,
previousActiveElement,
}),
[activeModal],
);
useEffect(() => {
if (!activeModal) {
previousActiveElement.current?.focus();
}
}, [activeModal]);
return (
<ActiveModalContext.Provider value={contextValue}>
<StyledModalContainer id={MODAL_CONTAINER_ID}>
<ModalContent aria-hidden={activeModal}>{props.children}</ModalContent>
</StyledModalContainer>
</ActiveModalContext.Provider>
);
}
export enum ModalAlertType {
info = 1,
caution,
warning,
}
const ModalAlertContainer = styled.div({
display: 'flex',
flexDirection: 'column',
flex: 1,
justifyContent: 'center',
padding: '26px 14px 14px',
});
const StyledModalAlert = styled.div({
display: 'flex',
flexDirection: 'column',
backgroundColor: colors.darkBlue,
borderRadius: '11px',
padding: '16px',
});
const ModalAlertIcon = styled.div({
display: 'flex',
justifyContent: 'center',
marginTop: '8px',
});
const ModalAlertButtonContainer = styled.div({
display: 'flex',
flexDirection: 'column',
marginTop: '18px',
});
interface IModalAlertProps {
type?: ModalAlertType;
iconColor?: string;
message?: string;
buttons: React.ReactNode[];
children?: React.ReactNode;
close?: () => void;
}
export function ModalAlert(props: IModalAlertProps) {
const activeModalContext = useContext(ActiveModalContext);
return <ModalAlertWithContext {...activeModalContext} {...props} />;
}
class ModalAlertWithContext extends React.Component<IModalAlertProps & IModalContext> {
private element = document.createElement('div');
private modalRef = React.createRef<HTMLDivElement>();
constructor(props: IModalAlertProps & IModalContext) {
super(props);
if (document.activeElement) {
props.previousActiveElement.current = document.activeElement as HTMLElement;
}
}
public componentDidMount() {
this.props.setActiveModal(true);
// The `true` argument specifies that the event should be dispatched in the capture phase. This
// makes sure that this component catches the event before the escape hatch.
document.addEventListener('keydown', this.handleKeyPress, true);
const modalContainer = document.getElementById(MODAL_CONTAINER_ID);
if (modalContainer) {
modalContainer.appendChild(this.element);
this.modalRef.current?.focus();
} else {
log.error('Modal container not found when mounting modal');
}
}
public componentWillUnmount() {
this.props.setActiveModal(false);
document.removeEventListener('keydown', this.handleKeyPress, true);
const modalContainer = document.getElementById(MODAL_CONTAINER_ID);
modalContainer?.removeChild(this.element);
}
public render() {
return ReactDOM.createPortal(this.renderModal(), this.element);
}
private renderModal() {
return (
<ModalBackground>
<ModalAlertContainer>
<StyledModalAlert ref={this.modalRef} tabIndex={-1} role="dialog" aria-modal>
{this.props.type && (
<ModalAlertIcon>{this.renderTypeIcon(this.props.type)}</ModalAlertIcon>
)}
{this.props.message && <ModalMessage>{this.props.message}</ModalMessage>}
{this.props.children}
{this.props.buttons.map((button, index) => (
<ModalAlertButtonContainer key={index}>{button}</ModalAlertButtonContainer>
))}
</StyledModalAlert>
</ModalAlertContainer>
</ModalBackground>
);
}
private renderTypeIcon(type: ModalAlertType) {
let source = '';
let color = '';
switch (type) {
case ModalAlertType.info:
source = 'icon-info';
color = colors.white;
break;
case ModalAlertType.caution:
source = 'icon-alert';
color = colors.white;
break;
case ModalAlertType.warning:
source = 'icon-alert';
color = colors.red;
break;
}
return (
<ImageView height={44} width={44} source={source} tintColor={this.props.iconColor ?? color} />
);
}
private handleKeyPress = (event: KeyboardEvent) => {
if (event.key === 'Escape') {
event.stopPropagation();
this.props.close?.();
}
};
}
export const ModalMessage = styled.span({
fontFamily: 'Open Sans',
fontSize: '13px',
fontWeight: 500,
lineHeight: '20px',
color: colors.white80,
marginTop: '16px',
});
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