91 lines
3.2 KiB
JavaScript
91 lines
3.2 KiB
JavaScript
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/**
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* Hide the element by sliding the contents upwards.
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* @param {Element} element
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* @param {Number} animTime
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*/
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export function slideUp(element, animTime = 400) {
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const currentHeight = element.getBoundingClientRect().height;
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const computedStyles = getComputedStyle(element);
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const currentPaddingTop = computedStyles.getPropertyValue('padding-top');
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const currentPaddingBottom = computedStyles.getPropertyValue('padding-bottom');
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const animStyles = {
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height: [`${currentHeight}px`, '0px'],
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overflow: ['hidden', 'hidden'],
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paddingTop: [currentPaddingTop, '0px'],
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paddingBottom: [currentPaddingBottom, '0px'],
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};
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animateStyles(element, animStyles, animTime, () => {
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element.style.display = 'none';
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});
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}
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/**
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* Show the given element by expanding the contents.
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* @param {Element} element - Element to animate
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* @param {Number} animTime - Animation time in ms
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*/
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export function slideDown(element, animTime = 400) {
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element.style.display = 'block';
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const targetHeight = element.getBoundingClientRect().height;
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const computedStyles = getComputedStyle(element);
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const targetPaddingTop = computedStyles.getPropertyValue('padding-top');
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const targetPaddingBottom = computedStyles.getPropertyValue('padding-bottom');
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const animStyles = {
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height: ['0px', `${targetHeight}px`],
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overflow: ['hidden', 'hidden'],
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paddingTop: ['0px', targetPaddingTop],
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paddingBottom: ['0px', targetPaddingBottom],
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};
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animateStyles(element, animStyles, animTime);
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}
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/**
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* Used in the function below to store references of clean-up functions.
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* Used to ensure only one transitionend function exists at any time.
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* @type {WeakMap<object, any>}
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*/
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const animateStylesCleanupMap = new WeakMap();
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/**
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* Animate the css styles of an element using FLIP animation techniques.
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* Styles must be an object where the keys are style properties, camelcase, and the values
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* are an array of two items in the format [initialValue, finalValue]
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* @param {Element} element
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* @param {Object} styles
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* @param {Number} animTime
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* @param {Function} onComplete
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*/
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function animateStyles(element, styles, animTime = 400, onComplete = null) {
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const styleNames = Object.keys(styles);
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for (let style of styleNames) {
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element.style[style] = styles[style][0];
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}
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const cleanup = () => {
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for (let style of styleNames) {
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element.style[style] = null;
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}
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element.style.transition = null;
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element.removeEventListener('transitionend', cleanup);
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if (onComplete) onComplete();
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};
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setTimeout(() => {
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requestAnimationFrame(() => {
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element.style.transition = `all ease-in-out ${animTime}ms`;
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for (let style of styleNames) {
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element.style[style] = styles[style][1];
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}
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if (animateStylesCleanupMap.has(element)) {
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const oldCleanup = animateStylesCleanupMap.get(element);
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element.removeEventListener('transitionend', oldCleanup);
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}
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element.addEventListener('transitionend', cleanup);
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animateStylesCleanupMap.set(element, cleanup);
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});
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}, 10);
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}
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