108 lines
3.0 KiB
TypeScript
108 lines
3.0 KiB
TypeScript
import addEventListener from '../vc-util/Dom/addEventListener';
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import supportsPassive from '../_util/supportsPassive';
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export type BindElement = HTMLElement | Window | null | undefined;
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export function getTargetRect(target: BindElement): DOMRect {
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return target !== window
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? (target as HTMLElement).getBoundingClientRect()
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: ({ top: 0, bottom: window.innerHeight } as DOMRect);
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}
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export function getFixedTop(placeholderReact: DOMRect, targetRect: DOMRect, offsetTop: number) {
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if (offsetTop !== undefined && targetRect.top > placeholderReact.top - offsetTop) {
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return `${offsetTop + targetRect.top}px`;
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}
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return undefined;
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}
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export function getFixedBottom(
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placeholderReact: DOMRect,
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targetRect: DOMRect,
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offsetBottom: number,
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) {
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if (offsetBottom !== undefined && targetRect.bottom < placeholderReact.bottom + offsetBottom) {
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const targetBottomOffset = window.innerHeight - targetRect.bottom;
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return `${offsetBottom + targetBottomOffset}px`;
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}
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return undefined;
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}
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// ======================== Observer ========================
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const TRIGGER_EVENTS = [
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'resize',
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'scroll',
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'touchstart',
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'touchmove',
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'touchend',
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'pageshow',
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'load',
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];
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interface ObserverEntity {
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target: HTMLElement | Window;
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affixList: any[];
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eventHandlers: { [eventName: string]: any };
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}
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let observerEntities: ObserverEntity[] = [];
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export function getObserverEntities() {
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// Only used in test env. Can be removed if refactor.
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return observerEntities;
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}
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export function addObserveTarget<T>(target: HTMLElement | Window | null, affix: T): void {
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if (!target) return;
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let entity = observerEntities.find(item => item.target === target);
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if (entity) {
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entity.affixList.push(affix);
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} else {
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entity = {
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target,
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affixList: [affix],
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eventHandlers: {},
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};
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observerEntities.push(entity);
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// Add listener
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TRIGGER_EVENTS.forEach(eventName => {
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entity!.eventHandlers[eventName] = addEventListener(target, eventName, () => {
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entity!.affixList.forEach(
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targetAffix => {
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const { lazyUpdatePosition } = (targetAffix as any).exposed;
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lazyUpdatePosition();
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},
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(eventName === 'touchstart' || eventName === 'touchmove') && supportsPassive
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? ({ passive: true } as EventListenerOptions)
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: false,
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);
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});
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});
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}
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}
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export function removeObserveTarget<T>(affix: T): void {
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const observerEntity = observerEntities.find(oriObserverEntity => {
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const hasAffix = oriObserverEntity.affixList.some(item => item === affix);
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if (hasAffix) {
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oriObserverEntity.affixList = oriObserverEntity.affixList.filter(item => item !== affix);
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}
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return hasAffix;
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});
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if (observerEntity && observerEntity.affixList.length === 0) {
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observerEntities = observerEntities.filter(item => item !== observerEntity);
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// Remove listener
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TRIGGER_EVENTS.forEach(eventName => {
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const handler = observerEntity.eventHandlers[eventName];
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if (handler && handler.remove) {
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handler.remove();
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}
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});
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}
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}
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