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import * as React from "react";
import { observer } from "mobx-react";
import { observable, action } from "mobx";
import { Utils } from "../../Utils";
export type OverlayDisposer = () => void;
export type OverlayElementOptions = {
x: number;
y: number;
width?: number;
height?: number;
};
@observer
export class OverlayView extends React.Component {
public static Instance: OverlayView;
@observable.shallow
private _elements: { ele: JSX.Element, id: string, options: OverlayElementOptions }[] = [];
constructor(props: any) {
super(props);
if (!OverlayView.Instance) {
OverlayView.Instance = this;
}
}
@action
addElement(ele: JSX.Element, options: OverlayElementOptions): OverlayDisposer {
const eleWithPosition = { ele, options, id: Utils.GenerateGuid() };
this._elements.push(eleWithPosition);
return action(() => {
const index = this._elements.indexOf(eleWithPosition);
if (index !== -1) this._elements.splice(index, 1);
});
}
render() {
return (
<div>
{this._elements.map(({ ele, options: { x, y, width, height }, id }) => (
<div key={id} style={{ position: "absolute", transform: `translate(${x}px, ${y}px)`, width, height }}>{ele}</div>
))}
</div>
);
}
}
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