86 lines
2.5 KiB
Java
86 lines
2.5 KiB
Java
import addEventListener from '../vc-util/Dom/addEventListener';
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export function getTargetRect(target) {
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return target !== window ? target.getBoundingClientRect() : { top: 0, bottom: window.innerHeight };
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}
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export function getFixedTop(placeholderReact, targetRect, offsetTop) {
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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(placeholderReact, targetRect, offsetBottom) {
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if (offsetBottom !== undefined && targetRect.bottom < placeholderReact.bottom + offsetBottom) {
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var 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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var TRIGGER_EVENTS = ['resize', 'scroll', 'touchstart', 'touchmove', 'touchend', 'pageshow', 'load'];
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var observerEntities = [];
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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(target, affix) {
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if (!target) return;
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var entity = observerEntities.find(function (item) {
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return item.target === target;
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});
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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: 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(function (eventName) {
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entity.eventHandlers[eventName] = addEventListener(target, eventName, function () {
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entity.affixList.forEach(function (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(affix) {
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var observerEntity = observerEntities.find(function (oriObserverEntity) {
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var hasAffix = oriObserverEntity.affixList.some(function (item) {
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return item === affix;
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});
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if (hasAffix) {
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oriObserverEntity.affixList = oriObserverEntity.affixList.filter(function (item) {
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return item !== affix;
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});
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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(function (item) {
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return item !== observerEntity;
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});
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// Remove listener
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TRIGGER_EVENTS.forEach(function (eventName) {
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var 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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} |