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A basic imodeljs marker integration with a React UI
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import React from "react"; | |
import ReactDOM from "react-dom"; | |
import { BeButtonEvent, DecorateContext, Decorator, Marker, IModelApp } from "@bentley/imodeljs-frontend"; | |
import { Point3d, XAndY, XYAndZ } from "@bentley/geometry-core"; | |
// a weak map would probably be better to prevent leaks | |
const reactSetHoverStateMap = new Map<PinMarker, (val: boolean) => void>(); | |
function InMarkerComponent(props: {markerInstance: PinMarker}) { | |
const [isHovered, setIsHovered] = React.useState(false); | |
React.useEffect(() => { | |
reactSetHoverStateMap.set(props.markerInstance, setIsHovered); | |
}, []); | |
React.useEffect(() => { | |
// this is needed especially if you start manipulating "isHovered" from another component, like when someone mouse-overs a UI component | |
IModelApp.viewManager.invalidateDecorationsAllViews(); // if you have multiple views you can do a more specific invalidation | |
}, [isHovered]); | |
return <div> {isHovered ? "hovered!" : "nope :("}</div> | |
} | |
export class PinMarker extends Marker { | |
public constructor(worldLocation: XYAndZ, size: XAndY = {x: 70, y: 20}) { | |
super(worldLocation, size); | |
this.htmlElement = document.createElement("div"); | |
ReactDOM.render(<InMarkerComponent markerInstance={this}/>, this.htmlElement); | |
} | |
public onMouseEnter(ev: BeButtonEvent) { | |
reactSetHoverStateMap.get(this)?.(true); | |
super.onMouseEnter(ev); | |
} | |
public onMouseLeave() { | |
reactSetHoverStateMap.get(this)?.(false); | |
return super.onMouseLeave(); | |
} | |
} | |
export interface PinDecorator extends Decorator { | |
markers: Map<Point3d, PinMarker>; | |
getPins?: () => Point3d[]; | |
} | |
export const pinDecorator: PinDecorator = { | |
markers: new Map(), | |
// when registered, decorate is called by the view manager every requested frame/update | |
decorate(ctx: DecorateContext) { | |
const currentPins = new Set(this.getPins?.()); | |
for (const loc of currentPins) { | |
if (!this.markers.has(loc)) this.markers.set(loc, new PinMarker(loc)); | |
} | |
for (const [loc, marker] of this.markers) { | |
if (!currentPins.has(loc)) this.markers.delete(loc); | |
else marker.addDecoration(ctx); | |
} | |
}, | |
}; |
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This is an excerpt of a modified version of the marker code created in my tutorial on primitive tools