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Optimise builder preview speed and performance and fix components not updating when changing props

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This commit is contained in:
Andrew Kingston 2020-11-30 12:11:50 +00:00
parent a0f3b16e51
commit 48a5a50e85
5 changed files with 40 additions and 16 deletions
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32
packages/builder/src/components/userInterface/AppPreview/CurrentItemPreview.svelte
View file

@ -22,27 +22,37 @@
? screenPlaceholder
: $store.currentPreviewItem
$: selectedComponentId = $store.currentComponentInfo?._id ?? ""
$: previewData = {
page,
screen,
selectedComponentId,
}
// Saving pages and screens to the DB causes them to have _revs.
// These revisions change every time a save happens and causes
// these reactive statements to fire, even though the actual
// definition hasn't changed.
// By deleting all _rev properties we can avoid this and increase
// performance.
$: json = JSON.stringify({ page, screen, selectedComponentId })
$: strippedJson = json.replaceAll(/"_rev":\s*"[^"]+"/g, `"_rev":""`)
// Update the iframe with the builder info to render the correct preview
const refreshContent = () => {
const refreshContent = message => {
if (iframe) {
iframe.contentWindow.postMessage(JSON.stringify(previewData))
iframe.contentWindow.postMessage(message)
}
}
// Refresh the preview when required
$: refreshContent(previewData)
$: refreshContent(strippedJson)
// Initialise the app when mounted
onMount(() => {
iframe.contentWindow.addEventListener("bb-ready", refreshContent, {
once: true,
})
iframe.contentWindow.addEventListener(
"bb-ready",
() => {
refreshContent(strippedJson)
},
{
once: true,
}
)
})
</script>

8
packages/builder/src/components/userInterface/AppPreview/iframeTemplate.js
View file

@ -32,9 +32,11 @@ export default `<html>
selectedComponentStyle.appendChild(document.createTextNode(selectedCss))
// Set some flags so the app knows we're in the builder
window["##BUDIBASE_IN_BUILDER##"] = true;
window["##BUDIBASE_PREVIEW_PAGE##"] = page;
window["##BUDIBASE_PREVIEW_SCREEN##"] = screen;
window["##BUDIBASE_IN_BUILDER##"] = true
window["##BUDIBASE_PREVIEW_PAGE##"] = page
window["##BUDIBASE_PREVIEW_SCREEN##"] = screen
window["##BUDIBASE_SELECTED_COMPONENT_ID##"] = selectedComponentId
window["##BUDIBASE_PREVIEW_ID##"] = Math.random()
// Initialise app
if (window.loadBudibase) {

12
packages/client/src/components/Component.svelte
View file

@ -4,7 +4,7 @@
import * as ComponentLibrary from "@budibase/standard-components"
import Router from "./Router.svelte"
import { enrichProps } from "../utils/componentProps"
import { bindingStore } from "../store"
import { bindingStore, builderStore } from "../store"
export let definition = {}
@ -32,12 +32,20 @@
const name = split?.[split.length - 1]
return name === "screenslot" ? Router : ComponentLibrary[name]
}
// Returns a unique key to let svelte know when to remount components.
// If a component is selected we want to remount it every time any props
// change.
const getChildKey = childId => {
const selected = childId === $builderStore.selectedComponentId
return selected ? `${childId}-${$builderStore.previewId}` : childId
}
</script>
{#if constructor}
<svelte:component this={constructor} {...enrichedProps}>
{#if children && children.length}
{#each children as child (child._id)}
{#each children as child (getChildKey(child._id))}
<svelte:self definition={child} />
{/each}
{/if}

2
packages/client/src/index.js
View file

@ -9,6 +9,8 @@ const loadBudibase = () => {
inBuilder: !!window["##BUDIBASE_IN_BUILDER##"],
page: window["##BUDIBASE_PREVIEW_PAGE##"],
screen: window["##BUDIBASE_PREVIEW_SCREEN##"],
selectedComponentId: window["##BUDIBASE_SELECTED_COMPONENT_ID##"],
previewId: window["##BUDIBASE_PREVIEW_ID##"],
})
// Create app if one hasn't been created yet

2
packages/client/src/store/builder.js
View file

@ -5,6 +5,8 @@ const createBuilderStore = () => {
inBuilder: false,
page: null,
screen: null,
selectedComponentId: null,
previewId: null,
}
return writable(initialState)
}