BookStack/resources/assets/js/services/animations.js

91 lines
3.2 KiB
JavaScript

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