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760 lines
26 KiB
JavaScript
760 lines
26 KiB
JavaScript
// The programming goals of Split.js are to deliver readable, understandable and
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// maintainable code, while at the same time manually optimizing for tiny minified file size,
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// browser compatibility without additional requirements, graceful fallback (IE8 is supported)
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// and very few assumptions about the user's page layout.
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const global = window
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const { document } = global
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// Save a couple long function names that are used frequently.
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// This optimization saves around 400 bytes.
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const addEventListener = 'addEventListener'
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const removeEventListener = 'removeEventListener'
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const getBoundingClientRect = 'getBoundingClientRect'
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const gutterStartDragging = '_a'
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const aGutterSize = '_b'
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const bGutterSize = '_c'
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const HORIZONTAL = 'horizontal'
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const NOOP = () => false
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// Figure out if we're in IE8 or not. IE8 will still render correctly,
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// but will be static instead of draggable.
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const isIE8 = global.attachEvent && !global[addEventListener]
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// Helper function determines which prefixes of CSS calc we need.
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// We only need to do this once on startup, when this anonymous function is called.
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//
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// Tests -webkit, -moz and -o prefixes. Modified from StackOverflow:
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// http://stackoverflow.com/questions/16625140/js-feature-detection-to-detect-the-usage-of-webkit-calc-over-calc/16625167#16625167
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const calc = `${['', '-webkit-', '-moz-', '-o-']
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.filter(prefix => {
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const el = document.createElement('div')
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el.style.cssText = `width:${prefix}calc(9px)`
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return !!el.style.length
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})
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.shift()}calc`
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// Helper function checks if its argument is a string-like type
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const isString = v => typeof v === 'string' || v instanceof String
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// Helper function allows elements and string selectors to be used
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// interchangeably. In either case an element is returned. This allows us to
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// do `Split([elem1, elem2])` as well as `Split(['#id1', '#id2'])`.
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const elementOrSelector = el => {
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if (isString(el)) {
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const ele = document.querySelector(el)
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if (!ele) {
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throw new Error(`Selector ${el} did not match a DOM element`)
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}
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return ele
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}
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return el
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}
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// Helper function gets a property from the properties object, with a default fallback
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const getOption = (options, propName, def) => {
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const value = options[propName]
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if (value !== undefined) {
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return value
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}
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return def
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}
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const getGutterSize = (gutterSize, isFirst, isLast, gutterAlign) => {
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if (isFirst) {
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if (gutterAlign === 'end') {
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return 0
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}
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if (gutterAlign === 'center') {
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return gutterSize / 2
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}
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} else if (isLast) {
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if (gutterAlign === 'start') {
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return 0
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}
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if (gutterAlign === 'center') {
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return gutterSize / 2
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}
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}
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return gutterSize
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}
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// Default options
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const defaultGutterFn = (i, gutterDirection) => {
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const gut = document.createElement('div')
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gut.className = `gutter gutter-${gutterDirection}`
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return gut
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}
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const defaultElementStyleFn = (dim, size, gutSize) => {
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const style = {}
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if (!isString(size)) {
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if (!isIE8) {
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style[dim] = `${calc}(${size}% - ${gutSize}px)`
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} else {
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style[dim] = `${size}%`
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}
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} else {
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style[dim] = size
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}
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return style
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}
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const defaultGutterStyleFn = (dim, gutSize) => ({ [dim]: `${gutSize}px` })
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// The main function to initialize a split. Split.js thinks about each pair
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// of elements as an independant pair. Dragging the gutter between two elements
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// only changes the dimensions of elements in that pair. This is key to understanding
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// how the following functions operate, since each function is bound to a pair.
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//
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// A pair object is shaped like this:
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//
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// {
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// a: DOM element,
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// b: DOM element,
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// aMin: Number,
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// bMin: Number,
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// dragging: Boolean,
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// parent: DOM element,
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// direction: 'horizontal' | 'vertical'
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// }
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//
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// The basic sequence:
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//
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// 1. Set defaults to something sane. `options` doesn't have to be passed at all.
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// 2. Initialize a bunch of strings based on the direction we're splitting.
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// A lot of the behavior in the rest of the library is paramatized down to
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// rely on CSS strings and classes.
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// 3. Define the dragging helper functions, and a few helpers to go with them.
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// 4. Loop through the elements while pairing them off. Every pair gets an
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// `pair` object and a gutter.
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// 5. Actually size the pair elements, insert gutters and attach event listeners.
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const Split = (idsOption, options = {}) => {
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let ids = idsOption
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let dimension
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let clientAxis
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let position
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let positionEnd
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let clientSize
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let elements
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// Allow HTMLCollection to be used as an argument when supported
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if (Array.from) {
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ids = Array.from(ids)
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}
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// All DOM elements in the split should have a common parent. We can grab
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// the first elements parent and hope users read the docs because the
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// behavior will be whacky otherwise.
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const firstElement = elementOrSelector(ids[0])
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const parent = firstElement.parentNode
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const parentFlexDirection = getComputedStyle
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? getComputedStyle(parent).flexDirection
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: null
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// Set default options.sizes to equal percentages of the parent element.
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let sizes = getOption(options, 'sizes') || ids.map(() => 100 / ids.length)
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// Standardize minSize to an array if it isn't already. This allows minSize
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// to be passed as a number.
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const minSize = getOption(options, 'minSize', 100)
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const minSizes = Array.isArray(minSize) ? minSize : ids.map(() => minSize)
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// Get other options
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const expandToMin = getOption(options, 'expandToMin', false)
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const gutterSize = getOption(options, 'gutterSize', 10)
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const gutterAlign = getOption(options, 'gutterAlign', 'center')
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const snapOffset = getOption(options, 'snapOffset', 30)
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const dragInterval = getOption(options, 'dragInterval', 1)
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const direction = getOption(options, 'direction', HORIZONTAL)
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const cursor = getOption(
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options,
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'cursor',
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direction === HORIZONTAL ? 'col-resize' : 'row-resize',
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)
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const gutter = getOption(options, 'gutter', defaultGutterFn)
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const elementStyle = getOption(
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options,
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'elementStyle',
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defaultElementStyleFn,
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)
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const gutterStyle = getOption(options, 'gutterStyle', defaultGutterStyleFn)
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// 2. Initialize a bunch of strings based on the direction we're splitting.
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// A lot of the behavior in the rest of the library is paramatized down to
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// rely on CSS strings and classes.
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if (direction === HORIZONTAL) {
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dimension = 'width'
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clientAxis = 'clientX'
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position = 'left'
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positionEnd = 'right'
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clientSize = 'clientWidth'
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} else if (direction === 'vertical') {
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dimension = 'height'
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clientAxis = 'clientY'
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position = 'top'
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positionEnd = 'bottom'
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clientSize = 'clientHeight'
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}
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// 3. Define the dragging helper functions, and a few helpers to go with them.
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// Each helper is bound to a pair object that contains its metadata. This
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// also makes it easy to store references to listeners that that will be
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// added and removed.
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//
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// Even though there are no other functions contained in them, aliasing
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// this to self saves 50 bytes or so since it's used so frequently.
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//
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// The pair object saves metadata like dragging state, position and
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// event listener references.
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function setElementSize(el, size, gutSize, i) {
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// Split.js allows setting sizes via numbers (ideally), or if you must,
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// by string, like '300px'. This is less than ideal, because it breaks
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// the fluid layout that `calc(% - px)` provides. You're on your own if you do that,
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// make sure you calculate the gutter size by hand.
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const style = elementStyle(dimension, size, gutSize, i)
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Object.keys(style).forEach(prop => {
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// eslint-disable-next-line no-param-reassign
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el.style[prop] = style[prop]
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})
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}
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function setGutterSize(gutterElement, gutSize, i) {
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const style = gutterStyle(dimension, gutSize, i)
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Object.keys(style).forEach(prop => {
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// eslint-disable-next-line no-param-reassign
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gutterElement.style[prop] = style[prop]
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})
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}
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function getSizes() {
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return elements.map(element => element.size)
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}
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// Supports touch events, but not multitouch, so only the first
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// finger `touches[0]` is counted.
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function getMousePosition(e) {
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if ('touches' in e) return e.touches[0][clientAxis]
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return e[clientAxis]
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}
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// Actually adjust the size of elements `a` and `b` to `offset` while dragging.
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// calc is used to allow calc(percentage + gutterpx) on the whole split instance,
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// which allows the viewport to be resized without additional logic.
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// Element a's size is the same as offset. b's size is total size - a size.
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// Both sizes are calculated from the initial parent percentage,
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// then the gutter size is subtracted.
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function adjust(offset) {
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const a = elements[this.a]
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const b = elements[this.b]
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const percentage = a.size + b.size
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a.size = (offset / this.size) * percentage
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b.size = percentage - (offset / this.size) * percentage
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setElementSize(a.element, a.size, this[aGutterSize], a.i)
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setElementSize(b.element, b.size, this[bGutterSize], b.i)
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}
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// drag, where all the magic happens. The logic is really quite simple:
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//
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// 1. Ignore if the pair is not dragging.
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// 2. Get the offset of the event.
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// 3. Snap offset to min if within snappable range (within min + snapOffset).
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// 4. Actually adjust each element in the pair to offset.
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//
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// ---------------------------------------------------------------------
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// | | <- a.minSize || b.minSize -> | |
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// | | | <- this.snapOffset || this.snapOffset -> | | |
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// | | | || | | |
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// | | | || | | |
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// ---------------------------------------------------------------------
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// | <- this.start this.size -> |
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function drag(e) {
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let offset
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const a = elements[this.a]
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const b = elements[this.b]
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if (!this.dragging) return
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// Get the offset of the event from the first side of the
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// pair `this.start`. Then offset by the initial position of the
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// mouse compared to the gutter size.
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offset =
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getMousePosition(e) -
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this.start +
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(this[aGutterSize] - this.dragOffset)
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if (dragInterval > 1) {
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offset = Math.round(offset / dragInterval) * dragInterval
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}
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// If within snapOffset of min or max, set offset to min or max.
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// snapOffset buffers a.minSize and b.minSize, so logic is opposite for both.
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// Include the appropriate gutter sizes to prevent overflows.
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if (offset <= a.minSize + snapOffset + this[aGutterSize]) {
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offset = a.minSize + this[aGutterSize]
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} else if (
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offset >=
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this.size - (b.minSize + snapOffset + this[bGutterSize])
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) {
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offset = this.size - (b.minSize + this[bGutterSize])
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}
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// Actually adjust the size.
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adjust.call(this, offset)
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// Call the drag callback continously. Don't do anything too intensive
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// in this callback.
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getOption(options, 'onDrag', NOOP)()
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}
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// Cache some important sizes when drag starts, so we don't have to do that
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// continously:
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//
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// `size`: The total size of the pair. First + second + first gutter + second gutter.
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// `start`: The leading side of the first element.
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//
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// ------------------------------------------------
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// | aGutterSize -> ||| |
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// | ||| |
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// | ||| |
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// | ||| <- bGutterSize |
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// ------------------------------------------------
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// | <- start size -> |
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function calculateSizes() {
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// Figure out the parent size minus padding.
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const a = elements[this.a].element
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const b = elements[this.b].element
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const aBounds = a[getBoundingClientRect]()
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const bBounds = b[getBoundingClientRect]()
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this.size =
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aBounds[dimension] +
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bBounds[dimension] +
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this[aGutterSize] +
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this[bGutterSize]
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this.start = aBounds[position]
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this.end = aBounds[positionEnd]
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}
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function innerSize(element) {
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// Return nothing if getComputedStyle is not supported (< IE9)
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// Or if parent element has no layout yet
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if (!getComputedStyle) return null
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const computedStyle = getComputedStyle(element)
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let size = element[clientSize]
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if (size === 0) return null
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if (direction === HORIZONTAL) {
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size -=
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parseFloat(computedStyle.paddingLeft) +
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parseFloat(computedStyle.paddingRight)
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} else {
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size -=
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parseFloat(computedStyle.paddingTop) +
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parseFloat(computedStyle.paddingBottom)
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}
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return size
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}
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// When specifying percentage sizes that are less than the computed
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// size of the element minus the gutter, the lesser percentages must be increased
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// (and decreased from the other elements) to make space for the pixels
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// subtracted by the gutters.
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function trimToMin(sizesToTrim) {
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// Try to get inner size of parent element.
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// If it's no supported, return original sizes.
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const parentSize = innerSize(parent)
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if (parentSize === null) {
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return sizesToTrim
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}
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// Keep track of the excess pixels, the amount of pixels over the desired percentage
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// Also keep track of the elements with pixels to spare, to decrease after if needed
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let excessPixels = 0
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const toSpare = []
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const pixelSizes = sizesToTrim.map((size, i) => {
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// Convert requested percentages to pixel sizes
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const pixelSize = (parentSize * size) / 100
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const elementGutterSize = getGutterSize(
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gutterSize,
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i === 0,
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i === sizesToTrim.length - 1,
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gutterAlign,
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)
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const elementMinSize = minSizes[i] + elementGutterSize
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// If element is too smal, increase excess pixels by the difference
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// and mark that it has no pixels to spare
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if (pixelSize < elementMinSize) {
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excessPixels += elementMinSize - pixelSize
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toSpare.push(0)
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return elementMinSize
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}
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// Otherwise, mark the pixels it has to spare and return it's original size
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toSpare.push(pixelSize - elementMinSize)
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return pixelSize
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})
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// If nothing was adjusted, return the original sizes
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if (excessPixels === 0) {
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return sizesToTrim
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}
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return pixelSizes.map((pixelSize, i) => {
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let newPixelSize = pixelSize
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// While there's still pixels to take, and there's enough pixels to spare,
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// take as many as possible up to the total excess pixels
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if (excessPixels > 0 && toSpare[i] - excessPixels > 0) {
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const takenPixels = Math.min(
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excessPixels,
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toSpare[i] - excessPixels,
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)
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// Subtract the amount taken for the next iteration
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excessPixels -= takenPixels
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newPixelSize = pixelSize - takenPixels
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}
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// Return the pixel size adjusted as a percentage
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return (newPixelSize / parentSize) * 100
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})
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}
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// stopDragging is very similar to startDragging in reverse.
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function stopDragging() {
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const self = this
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const a = elements[self.a].element
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const b = elements[self.b].element
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if (self.dragging) {
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getOption(options, 'onDragEnd', NOOP)(getSizes())
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}
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self.dragging = false
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// Remove the stored event listeners. This is why we store them.
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global[removeEventListener]('mouseup', self.stop)
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global[removeEventListener]('touchend', self.stop)
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global[removeEventListener]('touchcancel', self.stop)
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global[removeEventListener]('mousemove', self.move)
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global[removeEventListener]('touchmove', self.move)
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// Clear bound function references
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self.stop = null
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self.move = null
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a[removeEventListener]('selectstart', NOOP)
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a[removeEventListener]('dragstart', NOOP)
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b[removeEventListener]('selectstart', NOOP)
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b[removeEventListener]('dragstart', NOOP)
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a.style.userSelect = ''
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a.style.webkitUserSelect = ''
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a.style.MozUserSelect = ''
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a.style.pointerEvents = ''
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b.style.userSelect = ''
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b.style.webkitUserSelect = ''
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b.style.MozUserSelect = ''
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b.style.pointerEvents = ''
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self.gutter.style.cursor = ''
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self.parent.style.cursor = ''
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document.body.style.cursor = ''
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}
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// startDragging calls `calculateSizes` to store the inital size in the pair object.
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// It also adds event listeners for mouse/touch events,
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// and prevents selection while dragging so avoid the selecting text.
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function startDragging(e) {
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// Right-clicking can't start dragging.
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if ('button' in e && e.button !== 0) {
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return
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}
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// Alias frequently used variables to save space. 200 bytes.
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const self = this
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const a = elements[self.a].element
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const b = elements[self.b].element
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// Call the onDragStart callback.
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if (!self.dragging) {
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getOption(options, 'onDragStart', NOOP)(getSizes())
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}
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// Don't actually drag the element. We emulate that in the drag function.
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e.preventDefault()
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// Set the dragging property of the pair object.
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self.dragging = true
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// Create two event listeners bound to the same pair object and store
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// them in the pair object.
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self.move = drag.bind(self)
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self.stop = stopDragging.bind(self)
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// All the binding. `window` gets the stop events in case we drag out of the elements.
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global[addEventListener]('mouseup', self.stop)
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global[addEventListener]('touchend', self.stop)
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global[addEventListener]('touchcancel', self.stop)
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global[addEventListener]('mousemove', self.move)
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|
global[addEventListener]('touchmove', self.move)
|
|
|
|
// Disable selection. Disable!
|
|
a[addEventListener]('selectstart', NOOP)
|
|
a[addEventListener]('dragstart', NOOP)
|
|
b[addEventListener]('selectstart', NOOP)
|
|
b[addEventListener]('dragstart', NOOP)
|
|
|
|
a.style.userSelect = 'none'
|
|
a.style.webkitUserSelect = 'none'
|
|
a.style.MozUserSelect = 'none'
|
|
a.style.pointerEvents = 'none'
|
|
|
|
b.style.userSelect = 'none'
|
|
b.style.webkitUserSelect = 'none'
|
|
b.style.MozUserSelect = 'none'
|
|
b.style.pointerEvents = 'none'
|
|
|
|
// Set the cursor at multiple levels
|
|
self.gutter.style.cursor = cursor
|
|
self.parent.style.cursor = cursor
|
|
document.body.style.cursor = cursor
|
|
|
|
// Cache the initial sizes of the pair.
|
|
calculateSizes.call(self)
|
|
|
|
// Determine the position of the mouse compared to the gutter
|
|
self.dragOffset = getMousePosition(e) - self.end
|
|
}
|
|
|
|
// adjust sizes to ensure percentage is within min size and gutter.
|
|
sizes = trimToMin(sizes)
|
|
|
|
// 5. Create pair and element objects. Each pair has an index reference to
|
|
// elements `a` and `b` of the pair (first and second elements).
|
|
// Loop through the elements while pairing them off. Every pair gets a
|
|
// `pair` object and a gutter.
|
|
//
|
|
// Basic logic:
|
|
//
|
|
// - Starting with the second element `i > 0`, create `pair` objects with
|
|
// `a = i - 1` and `b = i`
|
|
// - Set gutter sizes based on the _pair_ being first/last. The first and last
|
|
// pair have gutterSize / 2, since they only have one half gutter, and not two.
|
|
// - Create gutter elements and add event listeners.
|
|
// - Set the size of the elements, minus the gutter sizes.
|
|
//
|
|
// -----------------------------------------------------------------------
|
|
// | i=0 | i=1 | i=2 | i=3 |
|
|
// | | | | |
|
|
// | pair 0 pair 1 pair 2 |
|
|
// | | | | |
|
|
// -----------------------------------------------------------------------
|
|
const pairs = []
|
|
elements = ids.map((id, i) => {
|
|
// Create the element object.
|
|
const element = {
|
|
element: elementOrSelector(id),
|
|
size: sizes[i],
|
|
minSize: minSizes[i],
|
|
i,
|
|
}
|
|
|
|
let pair
|
|
|
|
if (i > 0) {
|
|
// Create the pair object with its metadata.
|
|
pair = {
|
|
a: i - 1,
|
|
b: i,
|
|
dragging: false,
|
|
direction,
|
|
parent,
|
|
}
|
|
|
|
pair[aGutterSize] = getGutterSize(
|
|
gutterSize,
|
|
i - 1 === 0,
|
|
false,
|
|
gutterAlign,
|
|
)
|
|
pair[bGutterSize] = getGutterSize(
|
|
gutterSize,
|
|
false,
|
|
i === ids.length - 1,
|
|
gutterAlign,
|
|
)
|
|
|
|
// if the parent has a reverse flex-direction, switch the pair elements.
|
|
if (
|
|
parentFlexDirection === 'row-reverse' ||
|
|
parentFlexDirection === 'column-reverse'
|
|
) {
|
|
const temp = pair.a
|
|
pair.a = pair.b
|
|
pair.b = temp
|
|
}
|
|
}
|
|
|
|
// Determine the size of the current element. IE8 is supported by
|
|
// staticly assigning sizes without draggable gutters. Assigns a string
|
|
// to `size`.
|
|
//
|
|
// IE9 and above
|
|
if (!isIE8) {
|
|
// Create gutter elements for each pair.
|
|
if (i > 0) {
|
|
const gutterElement = gutter(i, direction, element.element)
|
|
setGutterSize(gutterElement, gutterSize, i)
|
|
|
|
// Save bound event listener for removal later
|
|
pair[gutterStartDragging] = startDragging.bind(pair)
|
|
|
|
// Attach bound event listener
|
|
gutterElement[addEventListener](
|
|
'mousedown',
|
|
pair[gutterStartDragging],
|
|
)
|
|
gutterElement[addEventListener](
|
|
'touchstart',
|
|
pair[gutterStartDragging],
|
|
)
|
|
|
|
parent.insertBefore(gutterElement, element.element)
|
|
|
|
pair.gutter = gutterElement
|
|
}
|
|
}
|
|
|
|
setElementSize(
|
|
element.element,
|
|
element.size,
|
|
getGutterSize(
|
|
gutterSize,
|
|
i === 0,
|
|
i === ids.length - 1,
|
|
gutterAlign,
|
|
),
|
|
)
|
|
|
|
// After the first iteration, and we have a pair object, append it to the
|
|
// list of pairs.
|
|
if (i > 0) {
|
|
pairs.push(pair)
|
|
}
|
|
|
|
return element
|
|
})
|
|
|
|
function adjustToMin(element) {
|
|
const isLast = element.i === pairs.length
|
|
const pair = isLast ? pairs[element.i - 1] : pairs[element.i]
|
|
|
|
calculateSizes.call(pair)
|
|
|
|
const size = isLast
|
|
? pair.size - element.minSize - pair[bGutterSize]
|
|
: element.minSize + pair[aGutterSize]
|
|
|
|
adjust.call(pair, size)
|
|
}
|
|
|
|
elements.forEach(element => {
|
|
const computedSize = element.element[getBoundingClientRect]()[dimension]
|
|
|
|
if (computedSize < element.minSize) {
|
|
if (expandToMin) {
|
|
adjustToMin(element)
|
|
} else {
|
|
// eslint-disable-next-line no-param-reassign
|
|
element.minSize = computedSize
|
|
}
|
|
}
|
|
})
|
|
|
|
function setSizes(newSizes) {
|
|
const trimmed = trimToMin(newSizes)
|
|
trimmed.forEach((newSize, i) => {
|
|
if (i > 0) {
|
|
const pair = pairs[i - 1]
|
|
|
|
const a = elements[pair.a]
|
|
const b = elements[pair.b]
|
|
|
|
a.size = trimmed[i - 1]
|
|
b.size = newSize
|
|
|
|
setElementSize(a.element, a.size, pair[aGutterSize])
|
|
setElementSize(b.element, b.size, pair[bGutterSize])
|
|
}
|
|
})
|
|
}
|
|
|
|
function destroy(preserveStyles, preserveGutter) {
|
|
pairs.forEach(pair => {
|
|
if (preserveGutter !== true) {
|
|
pair.parent.removeChild(pair.gutter)
|
|
} else {
|
|
pair.gutter[removeEventListener](
|
|
'mousedown',
|
|
pair[gutterStartDragging],
|
|
)
|
|
pair.gutter[removeEventListener](
|
|
'touchstart',
|
|
pair[gutterStartDragging],
|
|
)
|
|
}
|
|
|
|
if (preserveStyles !== true) {
|
|
const style = elementStyle(
|
|
dimension,
|
|
pair.a.size,
|
|
pair[aGutterSize],
|
|
)
|
|
|
|
Object.keys(style).forEach(prop => {
|
|
elements[pair.a].element.style[prop] = ''
|
|
elements[pair.b].element.style[prop] = ''
|
|
})
|
|
}
|
|
})
|
|
}
|
|
|
|
if (isIE8) {
|
|
return {
|
|
setSizes,
|
|
destroy,
|
|
}
|
|
}
|
|
|
|
return {
|
|
setSizes,
|
|
getSizes,
|
|
collapse(i) {
|
|
adjustToMin(elements[i])
|
|
},
|
|
destroy,
|
|
parent,
|
|
pairs,
|
|
}
|
|
}
|
|
|
|
export default Split
|