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107 lines
2.9 KiB
TypeScript
107 lines
2.9 KiB
TypeScript
import addEventListener from 'rc-util/lib/Dom/addEventListener';
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import type { InternalAffixClass } from '.';
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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(placeholderRect: DOMRect, targetRect: DOMRect, offsetTop?: number) {
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if (offsetTop !== undefined && targetRect.top > placeholderRect.top - offsetTop) {
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return offsetTop + targetRect.top;
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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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placeholderRect: 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 < placeholderRect.bottom + offsetBottom) {
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const targetBottomOffset = window.innerHeight - targetRect.bottom;
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return offsetBottom + targetBottomOffset;
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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 extends InternalAffixClass>(
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target: HTMLElement | Window | null,
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affix?: T,
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): void {
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if (!target) {
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return;
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}
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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((targetAffix) => {
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targetAffix.lazyUpdatePosition();
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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 extends InternalAffixClass>(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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