587 lines
20 KiB
JavaScript
587 lines
20 KiB
JavaScript
/*! Split.js - v1.3.5 */
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// https://github.com/nathancahill/Split.js
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// Copyright (c) 2017 Nathan Cahill; Licensed MIT
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(function(global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined'
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? (module.exports = factory())
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: typeof define === 'function' && define.amd
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? define(factory)
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: (global.Split = factory());
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})(this, function() {
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'use strict';
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// 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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var global = window;
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var document = global.document;
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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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var addEventListener = 'addEventListener';
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var removeEventListener = 'removeEventListener';
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var getBoundingClientRect = 'getBoundingClientRect';
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var NOOP = function() {
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return false;
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};
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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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var isIE8 = global.attachEvent && !global[addEventListener];
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// This library only needs two helper functions:
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//
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// The first 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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var calc =
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['', '-webkit-', '-moz-', '-o-']
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.filter(function(prefix) {
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var 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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// The second 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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var elementOrSelector = function(el) {
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if (typeof el === 'string' || el instanceof String) {
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return document.querySelector(el);
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}
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return el;
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};
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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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// isFirst: Boolean,
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// isLast: Boolean,
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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, a gutter, and special isFirst/isLast properties.
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// 5. Actually size the pair elements, insert gutters and attach event listeners.
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var Split = function(ids, options) {
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if (options === void 0) options = {};
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var dimension;
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var clientDimension;
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var clientAxis;
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var position;
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var paddingA;
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var paddingB;
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var elements;
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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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var parent = elementOrSelector(ids[0]).parentNode;
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var parentFlexDirection = global.getComputedStyle(parent).flexDirection;
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// Set default options.sizes to equal percentages of the parent element.
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var sizes =
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options.sizes ||
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ids.map(function() {
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return 100 / ids.length;
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});
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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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var minSize = options.minSize !== undefined ? options.minSize : 100;
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var minSizes = Array.isArray(minSize)
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? minSize
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: ids.map(function() {
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return minSize;
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});
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var gutterSize = options.gutterSize !== undefined ? options.gutterSize : 10;
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var snapOffset = options.snapOffset !== undefined ? options.snapOffset : 30;
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var direction = options.direction || 'horizontal';
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var cursor =
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options.cursor ||
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(direction === 'horizontal' ? 'ew-resize' : 'ns-resize');
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var gutter =
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options.gutter ||
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function(i, gutterDirection) {
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var 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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var elementStyle =
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options.elementStyle ||
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function(dim, size, gutSize) {
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var style = {};
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if (typeof size !== 'string' && !(size instanceof String)) {
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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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var gutterStyle =
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options.gutterStyle ||
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function(dim, gutSize) {
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return (obj = {}), (obj[dim] = gutSize + 'px'), obj;
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var obj;
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};
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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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clientDimension = 'clientWidth';
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clientAxis = 'clientX';
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position = 'left';
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paddingA = 'paddingLeft';
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paddingB = 'paddingRight';
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} else if (direction === 'vertical') {
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dimension = 'height';
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clientDimension = 'clientHeight';
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clientAxis = 'clientY';
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position = 'top';
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paddingA = 'paddingTop';
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paddingB = 'paddingBottom';
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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 it's 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) {
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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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var style = elementStyle(dimension, size, gutSize);
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// eslint-disable-next-line no-param-reassign
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Object.keys(style).forEach(function(prop) {
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return (el.style[prop] = style[prop]);
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});
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}
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function setGutterSize(gutterElement, gutSize) {
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var style = gutterStyle(dimension, gutSize);
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// eslint-disable-next-line no-param-reassign
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Object.keys(style).forEach(function(prop) {
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return (gutterElement.style[prop] = style[prop]);
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});
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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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var a = elements[this.a];
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var b = elements[this.b];
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var 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);
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setElementSize(b.element, b.size, this.bGutterSize);
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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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var offset;
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if (!this.dragging) {
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return;
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}
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// Get the offset of the event from the first side of the
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// pair `this.start`. Supports touch events, but not multitouch, so only the first
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// finger `touches[0]` is counted.
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if ('touches' in e) {
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offset = e.touches[0][clientAxis] - this.start;
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} else {
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offset = e[clientAxis] - this.start;
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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 <= elements[this.a].minSize + snapOffset + this.aGutterSize) {
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offset = elements[this.a].minSize + this.aGutterSize;
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} else if (
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offset >=
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this.size - (elements[this.b].minSize + snapOffset + this.bGutterSize)
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) {
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offset = this.size - (elements[this.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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if (options.onDrag) {
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options.onDrag();
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}
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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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var a = elements[this.a].element;
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var b = elements[this.b].element;
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this.size =
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a[getBoundingClientRect]()[dimension] +
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b[getBoundingClientRect]()[dimension] +
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this.aGutterSize +
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this.bGutterSize;
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this.start = a[getBoundingClientRect]()[position];
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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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var self = this;
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var a = elements[self.a].element;
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var b = elements[self.b].element;
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if (self.dragging && options.onDragEnd) {
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options.onDragEnd();
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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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self.parent[removeEventListener]('mousemove', self.move);
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self.parent[removeEventListener]('touchmove', self.move);
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// Delete them once they are removed. I think this makes a difference
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// in memory usage with a lot of splits on one page. But I don't know for sure.
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delete self.stop;
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delete self.move;
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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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}
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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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// Alias frequently used variables to save space. 200 bytes.
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var self = this;
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var a = elements[self.a].element;
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var b = elements[self.b].element;
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// Call the onDragStart callback.
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if (!self.dragging && options.onDragStart) {
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options.onDragStart();
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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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self.parent[addEventListener]('mousemove', self.move);
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self.parent[addEventListener]('touchmove', self.move);
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// Disable selection. Disable!
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a[addEventListener]('selectstart', NOOP);
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a[addEventListener]('dragstart', NOOP);
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b[addEventListener]('selectstart', NOOP);
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b[addEventListener]('dragstart', NOOP);
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a.style.userSelect = 'none';
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a.style.webkitUserSelect = 'none';
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a.style.MozUserSelect = 'none';
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a.style.pointerEvents = 'none';
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b.style.userSelect = 'none';
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b.style.webkitUserSelect = 'none';
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b.style.MozUserSelect = 'none';
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b.style.pointerEvents = 'none';
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// Set the cursor, both on the gutter and the parent element.
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// Doing only a, b and gutter causes flickering.
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self.gutter.style.cursor = cursor;
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self.parent.style.cursor = cursor;
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// Cache the initial sizes of the pair.
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calculateSizes.call(self);
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}
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// 5. Create pair and element objects. Each pair has an index reference to
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// elements `a` and `b` of the pair (first and second elements).
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// Loop through the elements while pairing them off. Every pair gets a
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// `pair` object, a gutter, and isFirst/isLast properties.
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//
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// Basic logic:
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//
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// - Starting with the second element `i > 0`, create `pair` objects with
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// `a = i - 1` and `b = i`
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// - Set gutter sizes based on the _pair_ being first/last. The first and last
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// pair have gutterSize / 2, since they only have one half gutter, and not two.
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// - Create gutter elements and add event listeners.
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// - Set the size of the elements, minus the gutter sizes.
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//
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// -----------------------------------------------------------------------
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// | i=0 | i=1 | i=2 | i=3 |
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// | | isFirst | | isLast |
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// | pair 0 pair 1 pair 2 |
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// | | | | |
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// -----------------------------------------------------------------------
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var pairs = [];
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elements = ids.map(function(id, i) {
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// Create the element object.
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var element = {
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element: elementOrSelector(id),
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size: sizes[i],
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minSize: minSizes[i]
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};
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var pair;
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if (i > 0) {
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// Create the pair object with it's metadata.
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pair = {
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a: i - 1,
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b: i,
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dragging: false,
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isFirst: i === 1,
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isLast: i === ids.length - 1,
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direction: direction,
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parent: parent
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};
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// For first and last pairs, first and last gutter width is half.
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pair.aGutterSize = gutterSize;
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pair.bGutterSize = gutterSize;
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if (pair.isFirst) {
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pair.aGutterSize = gutterSize / 2;
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}
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if (pair.isLast) {
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pair.bGutterSize = gutterSize / 2;
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}
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// if the parent has a reverse flex-direction, switch the pair elements.
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if (
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parentFlexDirection === 'row-reverse' ||
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parentFlexDirection === 'column-reverse'
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) {
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var temp = pair.a;
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pair.a = pair.b;
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pair.b = temp;
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}
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}
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// Determine the size of the current element. IE8 is supported by
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// staticly assigning sizes without draggable gutters. Assigns a string
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// to `size`.
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//
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// IE9 and above
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if (!isIE8) {
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// Create gutter elements for each pair.
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if (i > 0) {
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var gutterElement = gutter(i, direction);
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setGutterSize(gutterElement, gutterSize);
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gutterElement[addEventListener](
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'mousedown',
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startDragging.bind(pair)
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);
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gutterElement[addEventListener](
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'touchstart',
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startDragging.bind(pair)
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);
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parent.insertBefore(gutterElement, element.element);
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pair.gutter = gutterElement;
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}
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}
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// Set the element size to our determined size.
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// Half-size gutters for first and last elements.
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if (i === 0 || i === ids.length - 1) {
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setElementSize(element.element, element.size, gutterSize / 2);
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} else {
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setElementSize(element.element, element.size, gutterSize);
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}
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var computedSize = element.element[getBoundingClientRect]()[dimension];
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if (computedSize < element.minSize) {
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element.minSize = computedSize;
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}
|
|
|
|
// 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 setSizes(newSizes) {
|
|
newSizes.forEach(function(newSize, i) {
|
|
if (i > 0) {
|
|
var pair = pairs[i - 1];
|
|
var a = elements[pair.a];
|
|
var b = elements[pair.b];
|
|
|
|
a.size = newSizes[i - 1];
|
|
b.size = newSize;
|
|
|
|
setElementSize(a.element, a.size, pair.aGutterSize);
|
|
setElementSize(b.element, b.size, pair.bGutterSize);
|
|
}
|
|
});
|
|
}
|
|
|
|
function destroy() {
|
|
pairs.forEach(function(pair) {
|
|
pair.parent.removeChild(pair.gutter);
|
|
elements[pair.a].element.style[dimension] = '';
|
|
elements[pair.b].element.style[dimension] = '';
|
|
});
|
|
}
|
|
|
|
if (isIE8) {
|
|
return {
|
|
setSizes: setSizes,
|
|
destroy: destroy
|
|
};
|
|
}
|
|
|
|
return {
|
|
setSizes: setSizes,
|
|
getSizes: function getSizes() {
|
|
return elements.map(function(element) {
|
|
return element.size;
|
|
});
|
|
},
|
|
collapse: function collapse(i) {
|
|
if (i === pairs.length) {
|
|
var pair = pairs[i - 1];
|
|
|
|
calculateSizes.call(pair);
|
|
|
|
if (!isIE8) {
|
|
adjust.call(pair, pair.size - pair.bGutterSize);
|
|
}
|
|
} else {
|
|
var pair$1 = pairs[i];
|
|
|
|
calculateSizes.call(pair$1);
|
|
|
|
if (!isIE8) {
|
|
adjust.call(pair$1, pair$1.aGutterSize);
|
|
}
|
|
}
|
|
},
|
|
destroy: destroy
|
|
};
|
|
};
|
|
|
|
return Split;
|
|
});
|