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@@ -1,6 +1,6 @@
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/** @license
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========================================================================
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- Split.js v1.0.7
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+ Split.js v1.1.1
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Copyright (c) 2015 Nathan Cahill
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Permission is hereby granted, free of charge, to any person obtaining a copy
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@@ -22,17 +22,43 @@
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THE SOFTWARE.
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*/
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+
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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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+//
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+// Make sure all browsers handle this JS library correctly with ES5.
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+// More information here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
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'use strict';
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+// A wrapper function that does a couple things:
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+//
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+// 1. Doesn't pollute the global namespace. This is important for a library.
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+// 2. Allows us to mount the library in different module systems, as well as
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+// directly in the browser.
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(function() {
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+// Save the global `this` for use later. In this case, since the library only
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+// runs in the browser, it will refer to `window`. Also, figure out if we're in IE8
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+// or not. IE8 will still render correctly, but will be static instead of draggable.
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+//
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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 global = this
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+ , isIE8 = global.attachEvent && !global[addEventListener]
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+ , document = global.document
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, addEventListener = 'addEventListener'
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, removeEventListener = 'removeEventListener'
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, getBoundingClientRect = 'getBoundingClientRect'
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- , isIE8 = global.attachEvent && !global[addEventListener]
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- , document = global.document
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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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, calc = (function () {
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var el
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, prefixes = ["", "-webkit-", "-moz-", "-o-"]
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@@ -46,6 +72,10 @@ var global = this
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}
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}
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})()
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+
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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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, 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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@@ -54,6 +84,38 @@ var global = this
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}
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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. Define a few more functions that "balance" the entire split instance.
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+ // Split.js tries it's best to cope with min sizes that don't add up.
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+ // 5. 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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+ // 6. Actually size the pair elements, insert gutters and attach event listeners.
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+ // 7. Balance all of the pairs to accomodate min sizes as best as possible.
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, Split = function (ids, options) {
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var dimension
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, i
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@@ -65,8 +127,9 @@ var global = this
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, paddingB
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, pairs = []
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- // Set defaults
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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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+ // so create an options object if none exists. Pixel values 10, 100 and 30 are
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+ // arbitrary but feel natural.
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options = typeof options !== 'undefined' ? options : {}
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if (typeof options.gutterSize === 'undefined') options.gutterSize = 10
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@@ -74,6 +137,9 @@ var global = this
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if (typeof options.snapOffset === 'undefined') options.snapOffset = 30
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if (typeof options.direction === 'undefined') options.direction = 'horizontal'
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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 (options.direction == 'horizontal') {
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dimension = 'width'
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clientDimension = 'clientWidth'
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@@ -94,25 +160,43 @@ var global = this
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if (!options.cursor) options.cursor = 'ns-resize'
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}
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- // Event listeners for drag events, bound to a pair object.
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- // Calculate the pair's position and size when dragging starts.
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- // Prevent selection on start and re-enable it when done.
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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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+ //
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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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var startDragging = function (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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, a = self.a
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, b = self.b
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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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+
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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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@@ -120,10 +204,11 @@ var global = this
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self.parent[addEventListener]('mousemove', self.move)
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self.parent[addEventListener]('touchmove', self.move)
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- a[addEventListener]('selectstart', preventSelection)
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- a[addEventListener]('dragstart', preventSelection)
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- b[addEventListener]('selectstart', preventSelection)
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- b[addEventListener]('dragstart', preventSelection)
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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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@@ -135,11 +220,16 @@ var global = this
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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 = options.cursor
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self.parent.style.cursor = options.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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+
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+ // stopDragging is very similar to startDragging in reverse.
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, stopDragging = function () {
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var self = this
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, a = self.a
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@@ -151,6 +241,7 @@ var global = this
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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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@@ -158,13 +249,15 @@ var global = this
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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', preventSelection)
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- a[removeEventListener]('dragstart', preventSelection)
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- b[removeEventListener]('selectstart', preventSelection)
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- b[removeEventListener]('dragstart', preventSelection)
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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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@@ -179,36 +272,70 @@ var global = this
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self.gutter.style.cursor = ''
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self.parent.style.cursor = ''
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}
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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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+ // | | <- this.aMin || this.bMin -> | |
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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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, drag = function (e) {
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var offset
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if (!this.dragging) return
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- // Get the relative position of the event from the first side of the
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- // pair.
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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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-
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- if (offset <= this.aMin + options.snapOffset) {
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- offset = this.aMin
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- } else if (offset >= this.size - this.bMin - options.snapOffset) {
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- offset = this.size - this.bMin
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+ // If within snapOffset of min or max, set offset to min or max.
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+ // snapOffset buffers aMin and bMin, so logic is opposite for both.
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+ // Include the appropriate gutter sizes to prevent overflows.
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+ if (offset <= this.aMin + options.snapOffset + this.aGutterSize) {
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+ offset = this.aMin + this.aGutterSize
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+ } else if (offset >= this.size - (this.bMin + options.snapOffset + this.bGutterSize)) {
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+ offset = this.size - (this.bMin + 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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+
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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 element + second element + first gutter + second gutter.
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+ // `percentage`: The percentage between 0-100 that the pair occupies in the parent.
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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 -> | parentSize -> |
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, calculateSizes = function () {
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- // Calculate the pairs size, and percentage of the parent size
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+ // Figure out the parent size minus padding.
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var computedStyle = global.getComputedStyle(this.parent)
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, parentSize = this.parent[clientDimension] - parseFloat(computedStyle[paddingA]) - parseFloat(computedStyle[paddingB])
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@@ -216,13 +343,21 @@ var global = this
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this.percentage = Math.min(this.size / parentSize * 100, 100)
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this.start = this.a[getBoundingClientRect]()[position]
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}
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- , adjust = function (offset) {
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- // A size is the same as offset. B size is total size - A size.
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- // Both sizes are calculated from the initial parent percentage.
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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, then the gutter size is subtracted.
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+ , adjust = function (offset) {
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this.a.style[dimension] = calc + '(' + (offset / this.size * this.percentage) + '% - ' + this.aGutterSize + 'px)'
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this.b.style[dimension] = calc + '(' + (this.percentage - (offset / this.size * this.percentage)) + '% - ' + this.bGutterSize + 'px)'
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}
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+
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+ // 4. Define a few more functions that "balance" the entire split instance.
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+ // Split.js tries it's best to cope with min sizes that don't add up.
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+ // At some point this should go away since it breaks out of the calc(% - px) model.
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+ // Maybe it's a user error if you pass uncomputable minSizes.
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, fitMin = function () {
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var self = this
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, a = self.a
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@@ -260,9 +395,31 @@ var global = this
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fitMinReverse.call(pairs[i])
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}
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}
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- , preventSelection = function () { return false }
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+ , setElementSize = function (el, size, gutterSize) {
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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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+ if (typeof size !== 'string' && !(size instanceof String)) {
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+ if (!isIE8) {
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+ size = calc + '(' + size + '% - ' + gutterSize + 'px)'
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+ } else {
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+ size = options.sizes[i] + '%'
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+ }
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+ }
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+
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+ el.style[dimension] = size
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+ }
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+
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+ // No-op function to prevent default. Used to prevent selection.
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+ , noop = function () { return false }
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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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, parent = elementOrSelector(ids[0]).parentNode
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+ // Set default options.sizes to equal percentages of the parent element.
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if (!options.sizes) {
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var percent = 100 / ids.length
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@@ -273,6 +430,8 @@ var global = this
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}
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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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if (!Array.isArray(options.minSize)) {
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var minSizes = []
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@@ -283,15 +442,34 @@ var global = this
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options.minSize = minSizes
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}
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+ // 5. 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 = ids[i - 1]` and `b = ids[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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for (i = 0; i < ids.length; i++) {
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var el = elementOrSelector(ids[i])
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- , isFirst = (i == 1)
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- , isLast = (i == ids.length - 1)
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- , size
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+ , isFirstPair = (i == 1)
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+ , isLastPair = (i == ids.length - 1)
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+ , size = options.sizes[i]
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, gutterSize = options.gutterSize
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, 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: elementOrSelector(ids[i - 1]),
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b: el,
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@@ -299,27 +477,31 @@ var global = this
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bMin: options.minSize[i],
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dragging: false,
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parent: parent,
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- isFirst: isFirst,
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- isLast: isLast,
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+ isFirst: isFirstPair,
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+ isLast: isLastPair,
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direction: options.direction
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}
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// For first and last pairs, first and last gutter width is half.
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-
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pair.aGutterSize = options.gutterSize
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pair.bGutterSize = options.gutterSize
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- if (isFirst) {
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+ if (isFirstPair) {
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pair.aGutterSize = options.gutterSize / 2
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}
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- if (isLast) {
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+ if (isLastPair) {
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pair.bGutterSize = options.gutterSize / 2
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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 gutter = document.createElement('div')
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@@ -334,35 +516,62 @@ var global = this
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pair.gutter = gutter
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}
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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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|
gutterSize = options.gutterSize / 2
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}
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-
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- if (typeof options.sizes[i] === 'string' || options.sizes[i] instanceof String) {
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- size = options.sizes[i]
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|
- } else {
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- size = calc + '(' + options.sizes[i] + '% - ' + gutterSize + 'px)'
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|
- }
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-
|
|
|
- // IE8 and below
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|
|
- } else {
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|
|
- if (typeof options.sizes[i] === 'string' || options.sizes[i] instanceof String) {
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|
|
- size = options.sizes[i]
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|
|
- } else {
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|
|
- size = options.sizes[i] + '%'
|
|
|
- }
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|
|
}
|
|
|
|
|
|
- el.style[dimension] = size
|
|
|
+ // Set the element size to our determined size.
|
|
|
+ setElementSize(el, size, gutterSize)
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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)
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|
|
}
|
|
|
}
|
|
|
|
|
|
+ // Balance the pairs to try to accomodate min sizes.
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|
|
balancePairs(pairs)
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|
|
+
|
|
|
+ return {
|
|
|
+ setSizes: function (sizes) {
|
|
|
+ for (var i = 0; i < sizes.length; i++) {
|
|
|
+ if (i > 0) {
|
|
|
+ var pair = pairs[i - 1]
|
|
|
+
|
|
|
+ setElementSize(pair.a, sizes[i - 1], pair.aGutterSize)
|
|
|
+ setElementSize(pair.b, sizes[i], pair.bGutterSize)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ },
|
|
|
+ collapse: function (i) {
|
|
|
+ var pair
|
|
|
+
|
|
|
+ if (i === pairs.length) {
|
|
|
+ pair = pairs[i - 1]
|
|
|
+
|
|
|
+ calculateSizes.call(pair)
|
|
|
+ adjust.call(pair, pair.size - pair.bGutterSize)
|
|
|
+ } else {
|
|
|
+ pair = pairs[i]
|
|
|
+
|
|
|
+ calculateSizes.call(pair)
|
|
|
+ adjust.call(pair, pair.aGutterSize)
|
|
|
+ }
|
|
|
+ },
|
|
|
+ destroy: function () {
|
|
|
+ for (var i = 0; i < pairs.length; i++) {
|
|
|
+ pairs[i].parent.removeChild(pairs[i].gutter)
|
|
|
+ pairs[i].a.style[dimension] = ''
|
|
|
+ pairs[i].b.style[dimension] = ''
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
}
|
|
|
|
|
|
+// Play nicely with module systems, and the browser too if you include it raw.
|
|
|
if (typeof exports !== 'undefined') {
|
|
|
if (typeof module !== 'undefined' && module.exports) {
|
|
|
exports = module.exports = Split
|
|
|
@@ -372,4 +581,5 @@ if (typeof exports !== 'undefined') {
|
|
|
global.Split = Split
|
|
|
}
|
|
|
|
|
|
+// Call our wrapper function with the current global. In this case, `window`.
|
|
|
}).call(window);
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n1474335
