ant-design-vue/components/affix/utils.js

89 lines
2.4 KiB
JavaScript

import addEventListener from '../vc-util/Dom/addEventListener';
export function getTargetRect(target) {
return target !== window
? target.getBoundingClientRect()
: { top: 0, bottom: window.innerHeight };
}
export function getFixedTop(placeholderReact, targetRect, offsetTop) {
if (offsetTop !== undefined && targetRect.top > placeholderReact.top - offsetTop) {
return offsetTop + targetRect.top + 'px';
}
return undefined;
}
export function getFixedBottom(placeholderReact, targetRect, offsetBottom) {
if (offsetBottom !== undefined && targetRect.bottom < placeholderReact.bottom + offsetBottom) {
const targetBottomOffset = window.innerHeight - targetRect.bottom;
return offsetBottom + targetBottomOffset + 'px';
}
return undefined;
}
// ======================== Observer ========================
const TRIGGER_EVENTS = [
'resize',
'scroll',
'touchstart',
'touchmove',
'touchend',
'pageshow',
'load',
];
let observerEntities = [];
export function getObserverEntities() {
// Only used in test env. Can be removed if refactor.
return observerEntities;
}
export function addObserveTarget(target, affix) {
if (!target) return;
let entity = observerEntities.find(item => item.target === target);
if (entity) {
entity.affixList.push(affix);
} else {
entity = {
target,
affixList: [affix],
eventHandlers: {},
};
observerEntities.push(entity);
// Add listener
TRIGGER_EVENTS.forEach(eventName => {
entity.eventHandlers[eventName] = addEventListener(target, eventName, () => {
entity.affixList.forEach(targetAffix => {
targetAffix.lazyUpdatePosition();
});
});
});
}
}
export function removeObserveTarget(affix) {
const observerEntity = observerEntities.find(oriObserverEntity => {
const hasAffix = oriObserverEntity.affixList.some(item => item === affix);
if (hasAffix) {
oriObserverEntity.affixList = oriObserverEntity.affixList.filter(item => item !== affix);
}
return hasAffix;
});
if (observerEntity && observerEntity.affixList.length === 0) {
observerEntities = observerEntities.filter(item => item !== observerEntity);
// Remove listener
TRIGGER_EVENTS.forEach(eventName => {
const handler = observerEntity.eventHandlers[eventName];
if (handler && handler.remove) {
handler.remove();
}
});
}
}