LayoutAnimationBuilder.mjs
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import { GroupAnimation } from '../animation/GroupAnimation.mjs';
import { copyBoxInto } from '../projection/geometry/copy.mjs';
import { createBox } from '../projection/geometry/models.mjs';
import { HTMLProjectionNode } from '../projection/node/HTMLProjectionNode.mjs';
import { HTMLVisualElement } from '../render/html/HTMLVisualElement.mjs';
import { visualElementStore } from '../render/store.mjs';
import { resolveElements } from '../utils/resolve-elements.mjs';
import { frame } from '../frameloop/frame.mjs';
const layoutSelector = "[data-layout], [data-layout-id]";
const noop = () => { };
function snapshotFromTarget(projection) {
const target = projection.targetWithTransforms || projection.target;
if (!target)
return undefined;
const measuredBox = createBox();
const layoutBox = createBox();
copyBoxInto(measuredBox, target);
copyBoxInto(layoutBox, target);
return {
animationId: projection.root?.animationId ?? 0,
measuredBox,
layoutBox,
latestValues: projection.animationValues || projection.latestValues || {},
source: projection.id,
};
}
class LayoutAnimationBuilder {
constructor(scope, updateDom, defaultOptions) {
this.sharedTransitions = new Map();
this.notifyReady = noop;
this.rejectReady = noop;
this.scope = scope;
this.updateDom = updateDom;
this.defaultOptions = defaultOptions;
this.readyPromise = new Promise((resolve, reject) => {
this.notifyReady = resolve;
this.rejectReady = reject;
});
frame.postRender(() => {
this.start().then(this.notifyReady).catch(this.rejectReady);
});
}
shared(id, transition) {
this.sharedTransitions.set(id, transition);
return this;
}
then(resolve, reject) {
return this.readyPromise.then(resolve, reject);
}
async start() {
const beforeElements = collectLayoutElements(this.scope);
const beforeRecords = this.buildRecords(beforeElements);
beforeRecords.forEach(({ projection }) => {
const hasCurrentAnimation = Boolean(projection.currentAnimation);
const isSharedLayout = Boolean(projection.options.layoutId);
if (hasCurrentAnimation && isSharedLayout) {
const snapshot = snapshotFromTarget(projection);
if (snapshot) {
projection.snapshot = snapshot;
}
else if (projection.snapshot) {
projection.snapshot = undefined;
}
}
else if (projection.snapshot &&
(projection.currentAnimation || projection.isProjecting())) {
projection.snapshot = undefined;
}
projection.isPresent = true;
projection.willUpdate();
});
await this.updateDom();
const afterElements = collectLayoutElements(this.scope);
const afterRecords = this.buildRecords(afterElements);
this.handleExitingElements(beforeRecords, afterRecords);
afterRecords.forEach(({ projection }) => {
const instance = projection.instance;
const resumeFromInstance = projection.resumeFrom
?.instance;
if (!instance || !resumeFromInstance)
return;
if (!("style" in instance))
return;
const currentTransform = instance.style.transform;
const resumeFromTransform = resumeFromInstance.style.transform;
if (currentTransform &&
resumeFromTransform &&
currentTransform === resumeFromTransform) {
instance.style.transform = "";
instance.style.transformOrigin = "";
}
});
afterRecords.forEach(({ projection }) => {
projection.isPresent = true;
});
const root = getProjectionRoot(afterRecords, beforeRecords);
root?.didUpdate();
await new Promise((resolve) => {
frame.postRender(() => resolve());
});
const animations = collectAnimations(afterRecords);
const animation = new GroupAnimation(animations);
return animation;
}
buildRecords(elements) {
const records = [];
const recordMap = new Map();
for (const element of elements) {
const parentRecord = findParentRecord(element, recordMap, this.scope);
const { layout, layoutId } = readLayoutAttributes(element);
const override = layoutId
? this.sharedTransitions.get(layoutId)
: undefined;
const transition = override || this.defaultOptions;
const record = getOrCreateRecord(element, parentRecord?.projection, {
layout,
layoutId,
animationType: typeof layout === "string" ? layout : "both",
transition: transition,
});
recordMap.set(element, record);
records.push(record);
}
return records;
}
handleExitingElements(beforeRecords, afterRecords) {
const afterElementsSet = new Set(afterRecords.map((record) => record.element));
beforeRecords.forEach((record) => {
if (afterElementsSet.has(record.element))
return;
// For shared layout elements, relegate to set up resumeFrom
// so the remaining element animates from this position
if (record.projection.options.layoutId) {
record.projection.isPresent = false;
record.projection.relegate();
}
record.visualElement.unmount();
visualElementStore.delete(record.element);
});
// Clear resumeFrom on EXISTING nodes that point to unmounted projections
// This prevents crossfade animation when the source element was removed entirely
// But preserve resumeFrom for NEW nodes so they can animate from the old position
// Also preserve resumeFrom for lead nodes that were just promoted via relegate
const beforeElementsSet = new Set(beforeRecords.map((record) => record.element));
afterRecords.forEach(({ element, projection }) => {
if (beforeElementsSet.has(element) &&
projection.resumeFrom &&
!projection.resumeFrom.instance &&
!projection.isLead()) {
projection.resumeFrom = undefined;
projection.snapshot = undefined;
}
});
}
}
function parseAnimateLayoutArgs(scopeOrUpdateDom, updateDomOrOptions, options) {
// animateLayout(updateDom)
if (typeof scopeOrUpdateDom === "function") {
return {
scope: document,
updateDom: scopeOrUpdateDom,
defaultOptions: updateDomOrOptions,
};
}
// animateLayout(scope, updateDom, options?)
const elements = resolveElements(scopeOrUpdateDom);
const scope = elements[0] || document;
return {
scope,
updateDom: updateDomOrOptions,
defaultOptions: options,
};
}
function collectLayoutElements(scope) {
const elements = Array.from(scope.querySelectorAll(layoutSelector));
if (scope instanceof Element && scope.matches(layoutSelector)) {
if (!elements.includes(scope)) {
elements.unshift(scope);
}
}
return elements;
}
function readLayoutAttributes(element) {
const layoutId = element.getAttribute("data-layout-id") || undefined;
const rawLayout = element.getAttribute("data-layout");
let layout;
if (rawLayout === "" || rawLayout === "true") {
layout = true;
}
else if (rawLayout) {
layout = rawLayout;
}
return {
layout,
layoutId,
};
}
function createVisualState() {
return {
latestValues: {},
renderState: {
transform: {},
transformOrigin: {},
style: {},
vars: {},
},
};
}
function getOrCreateRecord(element, parentProjection, projectionOptions) {
const existing = visualElementStore.get(element);
const visualElement = existing ??
new HTMLVisualElement({
props: {},
presenceContext: null,
visualState: createVisualState(),
}, { allowProjection: true });
if (!existing || !visualElement.projection) {
visualElement.projection = new HTMLProjectionNode(visualElement.latestValues, parentProjection);
}
visualElement.projection.setOptions({
...projectionOptions,
visualElement,
});
if (!visualElement.current) {
visualElement.mount(element);
}
else if (!visualElement.projection.instance) {
// Mount projection if VisualElement is already mounted but projection isn't
// This happens when animate() was called before animateLayout()
visualElement.projection.mount(element);
}
if (!existing) {
visualElementStore.set(element, visualElement);
}
return {
element,
visualElement,
projection: visualElement.projection,
};
}
function findParentRecord(element, recordMap, scope) {
let parent = element.parentElement;
while (parent) {
const record = recordMap.get(parent);
if (record)
return record;
if (parent === scope)
break;
parent = parent.parentElement;
}
return undefined;
}
function getProjectionRoot(afterRecords, beforeRecords) {
const record = afterRecords[0] || beforeRecords[0];
return record?.projection.root;
}
function collectAnimations(afterRecords) {
const animations = new Set();
afterRecords.forEach((record) => {
const animation = record.projection.currentAnimation;
if (animation)
animations.add(animation);
});
return Array.from(animations);
}
export { LayoutAnimationBuilder, parseAnimateLayoutArgs };
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