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getEnabledElement,
triggerEvent,
getRenderingEngine,
} from '@cornerstonejs/core';
import { Events, ToolModes } from '../../enums';
import { draw as drawSvg } from '../../drawingSvg';
import getToolsWithModesForElement from '../../utilities/getToolsWithModesForElement';
import type { AnnotationRenderedEventDetail } from '../../types/EventTypes';
const { Active, Passive, Enabled } = ToolModes;
/**
* AnnotationRenderingEngine is a class that is responsible for rendering
* annotations defined in the renderAnnotation method of annotation tools on the page.
* It mimics the RenderingEngine in the Cornerstone Core. Here it uses requestAnimationFrame
* is used to render annotations by calling renderAnnotations() on each enabled tool. Note: This
* is a Singleton class and should not be instantiated directly. To trigger
* an annotation render for an HTML element containing a viewport you can use
*
* ```
* triggerAnnotationRender(element)
* ```
*/
class AnnotationRenderingEngine {
public hasBeenDestroyed: boolean;
private _needsRender: Set<HTMLDivElement> = new Set();
private _animationFrameSet = false;
private _animationFrameHandle: number | null = null;
private _viewportElements: Map<string, HTMLDivElement>;
constructor() {
this._viewportElements = new Map();
}
/**
* Add the viewport's HTMLDivElement to the viewports for rendering. This method
* just informs the annotationRenderingEngine about the viewport and
* does not initiate a render.
* @param viewportId - Viewport Unique identifier
* @param element - HTMLDivElement
*/
public addViewportElement(viewportId: string, element: HTMLDivElement) {
this._viewportElements.set(viewportId, element);
}
/**
* Remove the viewport's HTMLDivElement from subsequent annotation renders
* @param viewportId - Viewport Unique identifier
*/
public removeViewportElement(viewportId: string, element: HTMLDivElement) {
this._viewportElements.delete(viewportId);
// delete element from needsRender if element exist
this._needsRender.delete(element);
// I don' think there is any disadvantage to canceling the animation frame
// and resetting the flags on viewport's element removal, since the removeVIewportElement
// might be as a result of reEnabling the element (in re-enable we disable first), hence the need to render the
// new one while removing the old one
this._reset();
}
/**
* It tells the AnnotationRenderingEngine to render the viewport element the next
* time it renders.
*
* @param element - The element to render.
*/
public renderViewport(element: HTMLDivElement): void {
this._setViewportsToBeRenderedNextFrame([element]);
}
/**
* _throwIfDestroyed Throws an error if trying to interact with the `RenderingEngine`
* instance after its `destroy` method has been called.
*/
private _throwIfDestroyed() {
Iif (this.hasBeenDestroyed) {
throw new Error(
'this.destroy() has been manually called to free up memory, can not longer use this instance. Instead make a new one.'
);
}
}
private _renderFlaggedViewports = () => {
this._throwIfDestroyed();
const elements = Array.from(this._viewportElements.values());
for (let i = 0; i < elements.length; i++) {
const element = elements[i];
if (this._needsRender.has(element)) {
this._triggerRender(element);
// This viewport has been rendered, we can remove it from the set
this._needsRender.delete(element);
// If there is nothing left that is flagged for rendering, stop here
// and allow RAF to be called again
if (this._needsRender.size === 0) {
break;
}
}
}
this._animationFrameSet = false;
this._animationFrameHandle = null;
// Call render again which will use RAF to call this function asynchronously
// if there is any viewport that needs to be rendered because when
// `triggerRender` is called inside the render loop a listener can flag new
// viewports that need to be rendered and some of the viewports that were
// already rendered can be added back to `_needsRender`.
this._render();
};
private _setAllViewportsToBeRenderedNextFrame() {
const elements = [...this._viewportElements.values()];
elements.forEach((element) => {
this._needsRender.add(element);
});
this._renderFlaggedViewports();
}
private _setViewportsToBeRenderedNextFrame(elements: HTMLDivElement[]) {
const elementsEnabled = [...this._viewportElements.values()];
// Add the viewports to the set of flagged viewports
elements.forEach((element) => {
// only enabledElement need to render
Eif (elementsEnabled.indexOf(element) !== -1) {
this._needsRender.add(element);
}
});
// Render any flagged viewports
this._render();
}
/**
* _render Sets up animation frame if necessary
*/
private _render() {
// If we have viewports that need rendering and we have not already
// set the RAF callback to run on the next frame.
if (this._needsRender.size > 0 && this._animationFrameSet === false) {
this._animationFrameHandle = window.requestAnimationFrame(
this._renderFlaggedViewports
);
// Set the flag that we have already set up the next RAF call.
this._animationFrameSet = true;
}
}
_triggerRender(element) {
const enabledElement = getEnabledElement(element);
Iif (!enabledElement) {
// Happens during testing, and isn't an issue as it just means there
// is overlap between shutdown and re-render
// console.warn('Element has been disabled');
return;
}
const renderingEngine = getRenderingEngine(
enabledElement.renderingEngineId
);
Iif (!renderingEngine) {
console.warn('rendering Engine has been destroyed');
return;
}
const enabledTools = getToolsWithModesForElement(element, [
Active,
Passive,
Enabled,
]);
const { renderingEngineId, viewportId } = enabledElement;
const eventDetail: AnnotationRenderedEventDetail = {
element,
renderingEngineId,
viewportId,
};
// const enabledToolsWithAnnotations = enabledTools.filter((tool) => {
// const annotations = getAnnotations(tool.getToolName(), {FrameOfReferenceUID});
// return annotations && annotations.length;
// });
drawSvg(element, (svgDrawingHelper) => {
let anyRendered = false;
const handleDrawSvg = (tool) => {
if (tool.renderAnnotation) {
const rendered = tool.renderAnnotation(
enabledElement,
svgDrawingHelper
);
anyRendered = anyRendered || rendered;
}
};
/**
* We should be able to filter tools that don't have annotations, but
* currently some of tools have renderAnnotation method BUT
* don't keep annotation in the state, so if we do so, the tool will not be
* rendered.
*/
enabledTools.forEach(handleDrawSvg);
if (anyRendered) {
triggerEvent(element, Events.ANNOTATION_RENDERED, { ...eventDetail });
}
});
}
/**
* _reset Resets the `RenderingEngine`
*/
private _reset() {
window.cancelAnimationFrame(this._animationFrameHandle);
this._needsRender.clear();
this._animationFrameSet = false;
this._animationFrameHandle = null;
this._setAllViewportsToBeRenderedNextFrame();
}
}
const annotationRenderingEngine = new AnnotationRenderingEngine();
export { annotationRenderingEngine };
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