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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var vue = require('vue');
var shared = require('@vue/shared');
var lodashUnified = require('lodash-unified');
require('../../../utils/index.js');
var position = require('../../../utils/dom/position.js');
var error = require('../../../utils/error.js');
var scroll = require('../../../utils/dom/scroll.js');
const SCOPE = "ElInfiniteScroll";
const CHECK_INTERVAL = 50;
const DEFAULT_DELAY = 200;
const DEFAULT_DISTANCE = 0;
const attributes = {
delay: {
type: Number,
default: DEFAULT_DELAY
},
distance: {
type: Number,
default: DEFAULT_DISTANCE
},
disabled: {
type: Boolean,
default: false
},
immediate: {
type: Boolean,
default: true
}
};
const getScrollOptions = (el, instance) => {
return Object.entries(attributes).reduce((acm, [name, option]) => {
var _a, _b;
const { type, default: defaultValue } = option;
const attrVal = el.getAttribute(`infinite-scroll-${name}`);
let value = (_b = (_a = instance[attrVal]) != null ? _a : attrVal) != null ? _b : defaultValue;
value = value === "false" ? false : value;
value = type(value);
acm[name] = Number.isNaN(value) ? defaultValue : value;
return acm;
}, {});
};
const destroyObserver = (el) => {
const { observer } = el[SCOPE];
if (observer) {
observer.disconnect();
delete el[SCOPE].observer;
}
};
const handleScroll = (el, cb) => {
const { container, containerEl, instance, observer, lastScrollTop } = el[SCOPE];
const { disabled, distance } = getScrollOptions(el, instance);
const { clientHeight, scrollHeight, scrollTop } = containerEl;
const delta = scrollTop - lastScrollTop;
el[SCOPE].lastScrollTop = scrollTop;
if (observer || disabled || delta < 0)
return;
let shouldTrigger = false;
if (container === el) {
shouldTrigger = scrollHeight - (clientHeight + scrollTop) <= distance;
} else {
const { clientTop, scrollHeight: height } = el;
const offsetTop = position.getOffsetTopDistance(el, containerEl);
shouldTrigger = scrollTop + clientHeight >= offsetTop + clientTop + height - distance;
}
if (shouldTrigger) {
cb.call(instance);
}
};
function checkFull(el, cb) {
const { containerEl, instance } = el[SCOPE];
const { disabled } = getScrollOptions(el, instance);
if (disabled || containerEl.clientHeight === 0)
return;
if (containerEl.scrollHeight <= containerEl.clientHeight) {
cb.call(instance);
} else {
destroyObserver(el);
}
}
const InfiniteScroll = {
async mounted(el, binding) {
const { instance, value: cb } = binding;
if (!shared.isFunction(cb)) {
error.throwError(SCOPE, "'v-infinite-scroll' binding value must be a function");
}
await vue.nextTick();
const { delay, immediate } = getScrollOptions(el, instance);
const container = scroll.getScrollContainer(el, true);
const containerEl = container === window ? document.documentElement : container;
const onScroll = lodashUnified.throttle(handleScroll.bind(null, el, cb), delay);
if (!container)
return;
el[SCOPE] = {
instance,
container,
containerEl,
delay,
cb,
onScroll,
lastScrollTop: containerEl.scrollTop
};
if (immediate) {
const observer = new MutationObserver(lodashUnified.throttle(checkFull.bind(null, el, cb), CHECK_INTERVAL));
el[SCOPE].observer = observer;
observer.observe(el, { childList: true, subtree: true });
checkFull(el, cb);
}
container.addEventListener("scroll", onScroll);
},
unmounted(el) {
if (!el[SCOPE])
return;
const { container, onScroll } = el[SCOPE];
container == null ? void 0 : container.removeEventListener("scroll", onScroll);
destroyObserver(el);
},
async updated(el) {
if (!el[SCOPE]) {
await vue.nextTick();
} else {
const { containerEl, cb, observer } = el[SCOPE];
if (containerEl.clientHeight && observer) {
checkFull(el, cb);
}
}
}
};
exports.CHECK_INTERVAL = CHECK_INTERVAL;
exports.DEFAULT_DELAY = DEFAULT_DELAY;
exports.DEFAULT_DISTANCE = DEFAULT_DISTANCE;
exports.SCOPE = SCOPE;
exports["default"] = InfiniteScroll;
//# sourceMappingURL=index.js.map