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769 lines
29 KiB
769 lines
29 KiB
/*! Split.js - v1.6.2 */
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = global || self, global.Split = factory());
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}(this, (function () { '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
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// and very few assumptions about the user's page layout.
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var global = typeof window !== 'undefined' ? window : null;
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var ssr = global === null;
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var document = !ssr ? global.document : undefined;
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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 gutterStartDragging = '_a';
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var aGutterSize = '_b';
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var bGutterSize = '_c';
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var HORIZONTAL = 'horizontal';
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var NOOP = function () { return false; };
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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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var calc = ssr
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? '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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// Helper function checks if its argument is a string-like type
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var isString = function (v) { return 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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var elementOrSelector = function (el) {
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if (isString(el)) {
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var 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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var getOption = function (options, propName, def) {
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var 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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var getGutterSize = function (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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var defaultGutterFn = 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 defaultElementStyleFn = function (dim, size, gutSize) {
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var style = {};
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if (!isString(size)) {
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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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return style
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};
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var defaultGutterStyleFn = function (dim, gutSize) {
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var obj;
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return (( obj = {}, obj[dim] = (gutSize + "px"), obj ));
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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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// 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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var Split = function (idsOption, options) {
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if ( options === void 0 ) options = {};
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if (ssr) { return {} }
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var ids = idsOption;
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var dimension;
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var clientAxis;
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var position;
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var positionEnd;
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var clientSize;
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var 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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var firstElement = elementOrSelector(ids[0]);
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var parent = firstElement.parentNode;
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var parentStyle = getComputedStyle ? getComputedStyle(parent) : null;
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var parentFlexDirection = parentStyle ? parentStyle.flexDirection : null;
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// Set default options.sizes to equal percentages of the parent element.
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var sizes = getOption(options, 'sizes') || ids.map(function () { return 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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var minSize = getOption(options, 'minSize', 100);
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var minSizes = Array.isArray(minSize) ? minSize : ids.map(function () { return minSize; });
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// Get other options
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var expandToMin = getOption(options, 'expandToMin', false);
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var gutterSize = getOption(options, 'gutterSize', 10);
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var gutterAlign = getOption(options, 'gutterAlign', 'center');
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var snapOffset = getOption(options, 'snapOffset', 30);
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var dragInterval = getOption(options, 'dragInterval', 1);
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var direction = getOption(options, 'direction', HORIZONTAL);
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var 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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var gutter = getOption(options, 'gutter', defaultGutterFn);
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var 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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var 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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var style = elementStyle(dimension, size, gutSize, i);
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Object.keys(style).forEach(function (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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var style = gutterStyle(dimension, gutSize, i);
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Object.keys(style).forEach(function (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(function (element) { return 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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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], 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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var offset;
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var a = elements[this.a];
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var 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)(getSizes());
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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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var aBounds = a[getBoundingClientRect]();
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var 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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var computedStyle = getComputedStyle(element);
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if (!computedStyle) { return null }
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var 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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var parentSize = innerSize(parent);
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if (parentSize === null) {
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return sizesToTrim
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}
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if (minSizes.reduce(function (a, b) { return a + b; }, 0) > parentSize) {
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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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var excessPixels = 0;
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var toSpare = [];
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var pixelSizes = sizesToTrim.map(function (size, i) {
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// Convert requested percentages to pixel sizes
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var pixelSize = (parentSize * size) / 100;
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var 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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var 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(function (pixelSize, i) {
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var 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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var 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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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) {
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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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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.
|
|
if (!self.dragging) {
|
|
getOption(options, 'onDragStart', NOOP)(getSizes());
|
|
}
|
|
|
|
// Don't actually drag the element. We emulate that in the drag function.
|
|
e.preventDefault();
|
|
|
|
// Set the dragging property of the pair object.
|
|
self.dragging = true;
|
|
|
|
// Create two event listeners bound to the same pair object and store
|
|
// them in the pair object.
|
|
self.move = drag.bind(self);
|
|
self.stop = stopDragging.bind(self);
|
|
|
|
// All the binding. `window` gets the stop events in case we drag out of the elements.
|
|
global[addEventListener]('mouseup', self.stop);
|
|
global[addEventListener]('touchend', self.stop);
|
|
global[addEventListener]('touchcancel', self.stop);
|
|
global[addEventListener]('mousemove', self.move);
|
|
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 |
|
|
// | | | | |
|
|
// -----------------------------------------------------------------------
|
|
var pairs = [];
|
|
elements = ids.map(function (id, i) {
|
|
// Create the element object.
|
|
var element = {
|
|
element: elementOrSelector(id),
|
|
size: sizes[i],
|
|
minSize: minSizes[i],
|
|
i: i,
|
|
};
|
|
|
|
var pair;
|
|
|
|
if (i > 0) {
|
|
// Create the pair object with its metadata.
|
|
pair = {
|
|
a: i - 1,
|
|
b: i,
|
|
dragging: false,
|
|
direction: direction,
|
|
parent: 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'
|
|
) {
|
|
var 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`.
|
|
//
|
|
// Create gutter elements for each pair.
|
|
if (i > 0) {
|
|
var 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
|
|
),
|
|
i
|
|
);
|
|
|
|
// 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) {
|
|
var isLast = element.i === pairs.length;
|
|
var pair = isLast ? pairs[element.i - 1] : pairs[element.i];
|
|
|
|
calculateSizes.call(pair);
|
|
|
|
var size = isLast
|
|
? pair.size - element.minSize - pair[bGutterSize]
|
|
: element.minSize + pair[aGutterSize];
|
|
|
|
adjust.call(pair, size);
|
|
}
|
|
|
|
elements.forEach(function (element) {
|
|
var 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) {
|
|
var trimmed = trimToMin(newSizes);
|
|
trimmed.forEach(function (newSize, i) {
|
|
if (i > 0) {
|
|
var pair = pairs[i - 1];
|
|
|
|
var a = elements[pair.a];
|
|
var b = elements[pair.b];
|
|
|
|
a.size = trimmed[i - 1];
|
|
b.size = newSize;
|
|
|
|
setElementSize(a.element, a.size, pair[aGutterSize], a.i);
|
|
setElementSize(b.element, b.size, pair[bGutterSize], b.i);
|
|
}
|
|
});
|
|
}
|
|
|
|
function destroy(preserveStyles, preserveGutter) {
|
|
pairs.forEach(function (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) {
|
|
var style = elementStyle(
|
|
dimension,
|
|
pair.a.size,
|
|
pair[aGutterSize]
|
|
);
|
|
|
|
Object.keys(style).forEach(function (prop) {
|
|
elements[pair.a].element.style[prop] = '';
|
|
elements[pair.b].element.style[prop] = '';
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
return {
|
|
setSizes: setSizes,
|
|
getSizes: getSizes,
|
|
collapse: function collapse(i) {
|
|
adjustToMin(elements[i]);
|
|
},
|
|
destroy: destroy,
|
|
parent: parent,
|
|
pairs: pairs,
|
|
}
|
|
};
|
|
|
|
return Split;
|
|
|
|
})));
|
|
|