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import React from 'react';
import styled from 'styled-components';
import { colors } from '../../config.json';
import { assignToRef } from '../lib/utilityHooks';
interface IProps {
id?: string;
'aria-labelledby'?: string;
'aria-describedby'?: string;
isOn: boolean;
onChange?: (isOn: boolean) => void;
className?: string;
disabled?: boolean;
innerRef?: React.Ref<HTMLDivElement>;
}
interface IState {
isOn: boolean;
isPressed: boolean;
// gRPC calls cause the transition to glitch for some reason. Waiting with the onchange event
// until after the transition prevents the visual glitch from happening.
notifyOnTransitionEnd: boolean;
}
const PAN_DISTANCE = 10;
const SwitchContainer = styled.div({}, (props: { disabled: boolean }) => ({
position: 'relative',
width: '48px',
height: '30px',
borderColor: props.disabled ? colors.white20 : colors.white80,
borderWidth: '2px',
borderStyle: 'solid',
borderRadius: '16px',
padding: '2px',
}));
const Knob = styled.div({}, (props: { isOn: boolean; isPressed: boolean; disabled: boolean }) => {
let backgroundColor = props.isOn ? colors.green : colors.red;
if (props.disabled) {
backgroundColor = props.isOn ? colors.green40 : colors.red40;
}
return {
position: 'absolute',
height: '22px',
borderRadius: '11px',
transition: 'all 200ms linear',
width: props.isPressed ? '26px' : '22px',
backgroundColor,
// When enabled the button should be placed all the way to the right (100%) minus padding (2px).
left: props.isOn ? 'calc(100% - 2px)' : '2px',
// This moves the knob to the left making the right side aligned with the parent's right side.
transform: `translateX(${props.isOn ? '-100%' : '0'})`,
};
});
export default class Switch extends React.PureComponent<IProps, IState> {
public state: IState = {
isOn: this.props.isOn,
isPressed: false,
notifyOnTransitionEnd: false,
};
private containerRef = React.createRef<HTMLDivElement>();
private isPanning = false;
private startPos = 0;
private changedDuringPan = false;
public componentDidUpdate(prevProps: IProps, _prevState: IState) {
if (
this.props.isOn !== prevProps.isOn &&
this.props.isOn !== this.state.isOn &&
!this.isPanning
) {
this.setState({ isOn: this.props.isOn });
}
}
public render() {
return (
<SwitchContainer
ref={this.refCallback}
id={this.props.id}
role="checkbox"
aria-labelledby={this.props['aria-labelledby']}
aria-describedby={this.props['aria-describedby']}
aria-checked={this.props.isOn}
onClick={this.handleClick}
disabled={this.props.disabled ?? false}
aria-disabled={this.props.disabled ?? false}
tabIndex={-1}
className={this.props.className}>
<Knob
disabled={this.props.disabled ?? false}
isOn={this.state.isOn}
isPressed={this.state.isPressed}
onMouseDown={this.handleMouseDown}
onTransitionEnd={this.onTransitionEnd}
/>
</SwitchContainer>
);
}
public setOn(isOn: boolean) {
this.setState({ isOn });
}
private refCallback = (element: HTMLDivElement | null) => {
assignToRef(element, this.containerRef);
assignToRef(element, this.props.innerRef);
};
private onTransitionEnd = (event: React.TransitionEvent) => {
if (this.state.notifyOnTransitionEnd && event.propertyName === 'left') {
this.notify();
}
};
private handleClick = () => {
if (this.props.disabled) {
return;
}
if (!this.changedDuringPan) {
this.setState((state) => ({ isOn: !state.isOn, notifyOnTransitionEnd: true }));
}
// Needs to be reset to allow clicks on container after panning.
this.changedDuringPan = false;
};
private handleMouseDown = (event: React.MouseEvent<HTMLDivElement>) => {
if (this.props.disabled) {
return;
}
this.isPanning = true;
this.startPos = event.clientX;
this.changedDuringPan = false;
document.addEventListener('mouseup', this.handleMouseUp);
document.addEventListener('mousemove', this.handleMouseMove);
};
private handleMouseUp = (event: MouseEvent) => {
if (this.props.disabled) {
return;
}
document.removeEventListener('mouseup', this.handleMouseUp);
document.removeEventListener('mousemove', this.handleMouseMove);
this.setState({ isPressed: false });
this.isPanning = false;
// Reset changedDuringPan when onClick wont be called.
if (event.target instanceof Element && !this.containerRef.current?.contains(event.target)) {
this.changedDuringPan = false;
}
if (this.props.isOn !== this.state.isOn) {
this.notify();
}
};
private handleMouseMove = (event: MouseEvent) => {
if (this.props.disabled) {
return;
}
if (this.isPanning) {
this.setState({ isPressed: true });
const nextOn = this.computeNextState(event.clientX);
if (this.state.isOn !== nextOn) {
this.startPos = event.clientX;
this.changedDuringPan = true;
this.setState({ isOn: nextOn, notifyOnTransitionEnd: false });
}
}
};
private computeNextState(currentPos: number): boolean {
if (currentPos + PAN_DISTANCE < this.startPos && this.state.isOn) {
return false;
} else if (currentPos - PAN_DISTANCE > this.startPos && !this.state.isOn) {
return true;
} else {
return this.state.isOn;
}
}
private notify() {
this.props.onChange?.(this.state.isOn);
}
}
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