refactor(framework): Deprecate RenderScheduler in favor of Render.js #2728
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| import EventProvider from "./EventProvider.js"; | ||
| import RenderQueue from "./RenderQueue.js"; | ||
| import { getAllRegisteredTags } from "./CustomElementsRegistry.js"; | ||
| import { isRtlAware } from "./locale/RTLAwareRegistry.js"; | ||
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| const registeredElements = new Set(); | ||
| const eventProvider = new EventProvider(); | ||
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| const invalidatedWebComponents = new RenderQueue(); // Queue for invalidated web components | ||
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| let renderTaskPromise, | ||
| renderTaskPromiseResolve; | ||
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| let mutationObserverTimer; | ||
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| let queuePromise; | ||
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| /** | ||
| * Schedules a render task (if not already scheduled) to render the component | ||
| * | ||
| * @param webComponent | ||
| * @returns {Promise} | ||
| */ | ||
| const renderDeferred = async webComponent => { | ||
| // Enqueue the web component | ||
| invalidatedWebComponents.add(webComponent); | ||
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| // Schedule a rendering task | ||
| await scheduleRenderTask(); | ||
| }; | ||
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| /** | ||
| * Renders a component synchronously and adds it to the registry of rendered components | ||
| * | ||
| * @param webComponent | ||
| */ | ||
| const renderImmediately = webComponent => { | ||
| eventProvider.fireEvent("beforeComponentRender", webComponent); | ||
| registeredElements.add(webComponent); | ||
| webComponent._render(); | ||
| }; | ||
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| /** | ||
| * Cancels the rendering of a component, if awaiting to be rendered, and removes it from the registry of rendered components | ||
| * | ||
| * @param webComponent | ||
| */ | ||
| const cancelRender = webComponent => { | ||
| invalidatedWebComponents.remove(webComponent); | ||
| registeredElements.delete(webComponent); | ||
| }; | ||
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| /** | ||
| * Schedules a rendering task, if not scheduled already | ||
| */ | ||
| const scheduleRenderTask = async () => { | ||
| if (!queuePromise) { | ||
| queuePromise = new Promise(resolve => { | ||
| window.requestAnimationFrame(() => { | ||
| // Render all components in the queue | ||
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| // console.log(`--------------------RENDER TASK START------------------------------`); // eslint-disable-line | ||
| invalidatedWebComponents.process(renderImmediately); | ||
| // console.log(`--------------------RENDER TASK END------------------------------`); // eslint-disable-line | ||
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| // Resolve the promise so that callers of renderDeferred can continue | ||
| queuePromise = null; | ||
| resolve(); | ||
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| // Wait for Mutation observer before the render task is considered finished | ||
| if (!mutationObserverTimer) { | ||
| mutationObserverTimer = setTimeout(() => { | ||
| mutationObserverTimer = undefined; | ||
| if (invalidatedWebComponents.isEmpty()) { | ||
| _resolveTaskPromise(); | ||
| } | ||
| }, 200); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| await queuePromise; | ||
| }; | ||
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| /** | ||
| * return a promise that will be resolved once all invalidated web components are rendered | ||
| */ | ||
| const whenDOMUpdated = () => { | ||
| if (renderTaskPromise) { | ||
| return renderTaskPromise; | ||
| } | ||
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| renderTaskPromise = new Promise(resolve => { | ||
| renderTaskPromiseResolve = resolve; | ||
| window.requestAnimationFrame(() => { | ||
| if (invalidatedWebComponents.isEmpty()) { | ||
| renderTaskPromise = undefined; | ||
| resolve(); | ||
| } | ||
| }); | ||
| }); | ||
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| return renderTaskPromise; | ||
| }; | ||
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| const whenAllCustomElementsAreDefined = () => { | ||
| const definedPromises = getAllRegisteredTags().map(tag => customElements.whenDefined(tag)); | ||
| return Promise.all(definedPromises); | ||
| }; | ||
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| const whenFinished = async () => { | ||
| await whenAllCustomElementsAreDefined(); | ||
| await whenDOMUpdated(); | ||
| }; | ||
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| const _resolveTaskPromise = () => { | ||
| if (!invalidatedWebComponents.isEmpty()) { | ||
| // More updates are pending. Resolve will be called again | ||
| return; | ||
| } | ||
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| if (renderTaskPromiseResolve) { | ||
| renderTaskPromiseResolve(); | ||
| renderTaskPromiseResolve = undefined; | ||
| renderTaskPromise = undefined; | ||
| } | ||
| }; | ||
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| /** | ||
| * Re-renders all UI5 Elements on the page, with the option to specify filters to rerender only some components. | ||
| * | ||
| * Usage: | ||
| * reRenderAllUI5Elements() -> re-renders all components | ||
| * reRenderAllUI5Elements({tag: "ui5-button"}) -> re-renders only instances of ui5-button | ||
| * reRenderAllUI5Elements({rtlAware: true}) -> re-renders only rtlAware components | ||
| * reRenderAllUI5Elements({languageAware: true}) -> re-renders only languageAware components | ||
| * reRenderAllUI5Elements({rtlAware: true, languageAware: true}) -> re-renders components that are rtlAware or languageAware | ||
| * etc... | ||
| * | ||
| * @public | ||
| * @param {Object|undefined} filters - Object with keys that can be "rtlAware" or "languageAware" | ||
| * @returns {Promise<void>} | ||
| */ | ||
| const reRenderAllUI5Elements = async filters => { | ||
| registeredElements.forEach(element => { | ||
| const tag = element.constructor.getMetadata().getTag(); | ||
| const rtlAware = isRtlAware(element.constructor); | ||
| const languageAware = element.constructor.getMetadata().isLanguageAware(); | ||
| if (!filters || (filters.tag === tag) || (filters.rtlAware && rtlAware) || (filters.languageAware && languageAware)) { | ||
| renderDeferred(element); | ||
| } | ||
| }); | ||
| await whenFinished(); | ||
| }; | ||
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| const attachBeforeComponentRender = listener => { | ||
| eventProvider.attachEvent("beforeComponentRender", listener); | ||
| }; | ||
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| const detachBeforeComponentRender = listener => { | ||
| eventProvider.detachEvent("beforeComponentRender", listener); | ||
| }; | ||
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| export { | ||
| renderDeferred, | ||
| renderImmediately, | ||
| cancelRender, | ||
| whenFinished, | ||
| reRenderAllUI5Elements, | ||
| attachBeforeComponentRender, | ||
| detachBeforeComponentRender, | ||
| }; | ||
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not related to this change, but I think we should improve this with a loop, as the DOM Update promise might result in more undefined custom elements.