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import { action, computed, IReactionDisposer, makeObservable, observable, reaction, runInAction } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import './RadialMenu.scss';
import { RadialMenuItem, RadialMenuProps } from './RadialMenuItem';
@observer
export class RadialMenu extends React.Component {
static Instance: RadialMenu;
static readonly buffer = 20;
constructor(props: any) {
super(props);
makeObservable(this);
RadialMenu.Instance = this;
}
@observable private _mouseX: number = -1;
@observable private _mouseY: number = -1;
@observable private _shouldDisplay: boolean = false;
@observable private _mouseDown: boolean = false;
private _reactionDisposer?: IReactionDisposer;
public used: boolean = false;
catchTouch = (te: React.TouchEvent) => {
te.stopPropagation();
te.preventDefault();
};
@action
onPointerDown = (e: PointerEvent) => {
this._mouseDown = true;
this._mouseX = e.clientX;
this._mouseY = e.clientY;
this.used = false;
document.addEventListener('pointermove', this.onPointerMove);
};
@observable
private _closest: number = -1;
@action
onPointerMove = (e: PointerEvent) => {
const curX = e.clientX;
const curY = e.clientY;
const deltX = this._mouseX - curX;
const deltY = this._mouseY - curY;
const scale = Math.hypot(deltY, deltX);
if (scale < 150 && scale > 50) {
const rad = Math.atan2(deltY, deltX) + Math.PI;
let closest = 0;
let closestval = 999999999;
for (let x = 0; x < this._items.length; x++) {
const curmin = (x / this._items.length) * 2 * Math.PI;
if (rad - curmin < closestval && rad - curmin > 0) {
closestval = rad - curmin;
closest = x;
}
}
this._closest = closest;
} else {
this._closest = -1;
}
};
@action
onPointerUp = (e: PointerEvent) => {
this.used = true;
this._mouseDown = false;
const curX = e.clientX;
const curY = e.clientY;
if (this._mouseX !== curX || this._mouseY !== curY) {
this._shouldDisplay = false;
}
this._shouldDisplay && (this._display = true);
document.removeEventListener('pointermove', this.onPointerMove);
if (this._closest !== -1 && this._items?.length > this._closest) {
this._items[this._closest].event();
}
};
componentWillUnmount() {
document.removeEventListener('pointerdown', this.onPointerDown);
document.removeEventListener('pointerup', this.onPointerUp);
this._reactionDisposer && this._reactionDisposer();
}
@action
componentDidMount() {
document.addEventListener('pointerdown', this.onPointerDown);
document.addEventListener('pointerup', this.onPointerUp);
this.previewcircle();
this._reactionDisposer = reaction(
() => this._shouldDisplay,
() => this._shouldDisplay && !this._mouseDown && runInAction(() => (this._display = true))
);
}
componentDidUpdate = () => {
this.previewcircle();
};
@observable private _pageX: number = 0;
@observable private _pageY: number = 0;
@observable _display: boolean = false;
@observable private _yRelativeToTop: boolean = true;
@observable private _width: number = 0;
@observable private _height: number = 0;
getItems() {
return this._items;
}
@action
addItem(item: RadialMenuProps) {
if (this._items.indexOf(item) === -1) {
this._items.push(item);
}
}
@observable
private _items: Array<RadialMenuProps> = [];
@action
displayMenu = (x: number, y: number) => {
//maxX and maxY will change if the UI/font size changes, but will work for any amount
//of items added to the menu
this._mouseX = x;
this._mouseY = y;
this._shouldDisplay = true;
};
// @computed
// get pageX() {
// const x = this._pageX;
// if (x < 0) {
// return 0;
// }
// const width = this._width;
// if (x + width > window.innerWidth - RadialMenu.buffer) {
// return window.innerWidth - RadialMenu.buffer - width;
// }
// return x;
// }
// @computed
// get pageY() {
// const y = this._pageY;
// if (y < 0) {
// return 0;
// }
// const height = this._height;
// if (y + height > window.innerHeight - RadialMenu.buffer) {
// return window.innerHeight - RadialMenu.buffer - height;
// }
// return y;
// }
@computed get menuItems() {
return this._items.map((item, index) => <RadialMenuItem {...item} key={item.description} closeMenu={this.closeMenu} max={this._items.length} min={index} selected={this._closest} />);
}
@action
closeMenu = () => {
this.clearItems();
this._display = false;
this._shouldDisplay = false;
};
@action
openMenu = (x: number, y: number) => {
this._pageX = x;
this._pageY = y;
this._shouldDisplay;
this._display = true;
};
@action
clearItems() {
this._items = [];
}
previewcircle() {
if (document.getElementById('newCanvas') !== null) {
const c: any = document.getElementById('newCanvas');
if (c.getContext) {
const ctx = c.getContext('2d');
ctx.beginPath();
ctx.arc(150, 150, 50, 0, 2 * Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
ctx.font = '12px Arial';
ctx.fillStyle = 'black';
ctx.textAlign = 'center';
let description = '';
if (this._closest !== -1) {
description = this._items[this._closest].description;
}
if (description.length > 15) {
description = description.slice(0, 12);
description += '...';
}
ctx.fillText(description, 150, 150, 90);
}
}
}
render() {
if (!this._display) {
return null;
}
const style = this._yRelativeToTop ? { left: this._pageX - 130, top: this._pageY - 130 } : { left: this._pageX - 130, top: this._pageY - 130 };
return (
<div className="radialMenu-cont" onTouchStart={this.catchTouch} style={style}>
<canvas id="newCanvas" style={{ position: 'absolute' }} height="300" width="300">
{' '}
Your browser does not support the HTML5 canvas tag.
</canvas>
{this.menuItems}
</div>
);
}
}
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