/*! Split.js - v1.5.11 */
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.Split = factory());
}(this, (function () { 'use strict';
// The programming goals of Split.js are to deliver readable, understandable and
// maintainable code, while at the same time manually optimizing for tiny minified file size,
// browser compatibility without additional requirements, graceful fallback (IE8 is supported)
// and very few assumptions about the user's page layout.
var global = window;
var document = global.document;
// Save a couple long function names that are used frequently.
// This optimization saves around 400 bytes.
var addEventListener = 'addEventListener';
var removeEventListener = 'removeEventListener';
var getBoundingClientRect = 'getBoundingClientRect';
var gutterStartDragging = '_a';
var aGutterSize = '_b';
var bGutterSize = '_c';
var HORIZONTAL = 'horizontal';
var NOOP = function () { return false; };
// Figure out if we're in IE8 or not. IE8 will still render correctly,
// but will be static instead of draggable.
var isIE8 = global.attachEvent && !global[addEventListener];
// Helper function determines which prefixes of CSS calc we need.
// We only need to do this once on startup, when this anonymous function is called.
//
// Tests -webkit, -moz and -o prefixes. Modified from StackOverflow:
// http://stackoverflow.com/questions/16625140/js-feature-detection-to-detect-the-usage-of-webkit-calc-over-calc/16625167#16625167
var calc = (['', '-webkit-', '-moz-', '-o-']
.filter(function (prefix) {
var el = document.createElement('div');
el.style.cssText = "width:" + prefix + "calc(9px)";
return !!el.style.length
})
.shift()) + "calc";
// Helper function checks if its argument is a string-like type
var isString = function (v) { return typeof v === 'string' || v instanceof String; };
// Helper function allows elements and string selectors to be used
// interchangeably. In either case an element is returned. This allows us to
// do `Split([elem1, elem2])` as well as `Split(['#id1', '#id2'])`.
var elementOrSelector = function (el) {
if (isString(el)) {
var ele = document.querySelector(el);
if (!ele) {
throw new Error(("Selector " + el + " did not match a DOM element"))
}
return ele
}
return el
};
// Helper function gets a property from the properties object, with a default fallback
var getOption = function (options, propName, def) {
var value = options[propName];
if (value !== undefined) {
return value
}
return def
};
var getGutterSize = function (gutterSize, isFirst, isLast, gutterAlign) {
if (isFirst) {
if (gutterAlign === 'end') {
return 0
}
if (gutterAlign === 'center') {
return gutterSize / 2
}
} else if (isLast) {
if (gutterAlign === 'start') {
return 0
}
if (gutterAlign === 'center') {
return gutterSize / 2
}
}
return gutterSize
};
// Default options
var defaultGutterFn = function (i, gutterDirection) {
var gut = document.createElement('div');
gut.className = "gutter gutter-" + gutterDirection;
return gut
};
var defaultElementStyleFn = function (dim, size, gutSize) {
var style = {};
if (!isString(size)) {
if (!isIE8) {
style[dim] = calc + "(" + size + "% - " + gutSize + "px)";
} else {
style[dim] = size + "%";
}
} else {
style[dim] = size;
}
return style
};
var defaultGutterStyleFn = function (dim, gutSize) {
var obj;
return (( obj = {}, obj[dim] = (gutSize + "px"), obj ));
};
// The main function to initialize a split. Split.js thinks about each pair
// of elements as an independant pair. Dragging the gutter between two elements
// only changes the dimensions of elements in that pair. This is key to understanding
// how the following functions operate, since each function is bound to a pair.
//
// A pair object is shaped like this:
//
// {
// a: DOM element,
// b: DOM element,
// aMin: Number,
// bMin: Number,
// dragging: Boolean,
// parent: DOM element,
// direction: 'horizontal' | 'vertical'
// }
//
// The basic sequence:
//
// 1. Set defaults to something sane. `options` doesn't have to be passed at all.
// 2. Initialize a bunch of strings based on the direction we're splitting.
// A lot of the behavior in the rest of the library is paramatized down to
// rely on CSS strings and classes.
// 3. Define the dragging helper functions, and a few helpers to go with them.
// 4. Loop through the elements while pairing them off. Every pair gets an
// `pair` object and a gutter.
// 5. Actually size the pair elements, insert gutters and attach event listeners.
var Split = function (idsOption, options) {
if ( options === void 0 ) options = {};
var ids = idsOption;
var dimension;
var clientAxis;
var position;
var positionEnd;
var clientSize;
var elements;
// Allow HTMLCollection to be used as an argument when supported
if (Array.from) {
ids = Array.from(ids);
}
// All DOM elements in the split should have a common parent. We can grab
// the first elements parent and hope users read the docs because the
// behavior will be whacky otherwise.
var firstElement = elementOrSelector(ids[0]);
var parent = firstElement.parentNode;
var parentStyle = getComputedStyle ? getComputedStyle(parent) : null;
var parentFlexDirection = parentStyle ? parentStyle.flexDirection : null;
// Set default options.sizes to equal percentages of the parent element.
var sizes = getOption(options, 'sizes') || ids.map(function () { return 100 / ids.length; });
// Standardize minSize to an array if it isn't already. This allows minSize
// to be passed as a number.
var minSize = getOption(options, 'minSize', 100);
var minSizes = Array.isArray(minSize) ? minSize : ids.map(function () { return minSize; });
// Get other options
var expandToMin = getOption(options, 'expandToMin', false);
var gutterSize = getOption(options, 'gutterSize', 10);
var gutterAlign = getOption(options, 'gutterAlign', 'center');
var snapOffset = getOption(options, 'snapOffset', 30);
var dragInterval = getOption(options, 'dragInterval', 1);
var direction = getOption(options, 'direction', HORIZONTAL);
var cursor = getOption(
options,
'cursor',
direction === HORIZONTAL ? 'col-resize' : 'row-resize'
);
var gutter = getOption(options, 'gutter', defaultGutterFn);
var elementStyle = getOption(
options,
'elementStyle',
defaultElementStyleFn
);
var gutterStyle = getOption(options, 'gutterStyle', defaultGutterStyleFn);
// 2. Initialize a bunch of strings based on the direction we're splitting.
// A lot of the behavior in the rest of the library is paramatized down to
// rely on CSS strings and classes.
if (direction === HORIZONTAL) {
dimension = 'width';
clientAxis = 'clientX';
position = 'left';
positionEnd = 'right';
clientSize = 'clientWidth';
} else if (direction === 'vertical') {
dimension = 'height';
clientAxis = 'clientY';
position = 'top';
positionEnd = 'bottom';
clientSize = 'clientHeight';
}
// 3. Define the dragging helper functions, and a few helpers to go with them.
// Each helper is bound to a pair object that contains its metadata. This
// also makes it easy to store references to listeners that that will be
// added and removed.
//
// Even though there are no other functions contained in them, aliasing
// this to self saves 50 bytes or so since it's used so frequently.
//
// The pair object saves metadata like dragging state, position and
// event listener references.
function setElementSize(el, size, gutSize, i) {
// Split.js allows setting sizes via numbers (ideally), or if you must,
// by string, like '300px'. This is less than ideal, because it breaks
// the fluid layout that `calc(% - px)` provides. You're on your own if you do that,
// make sure you calculate the gutter size by hand.
var style = elementStyle(dimension, size, gutSize, i);
Object.keys(style).forEach(function (prop) {
// eslint-disable-next-line no-param-reassign
el.style[prop] = style[prop];
});
}
function setGutterSize(gutterElement, gutSize, i) {
var style = gutterStyle(dimension, gutSize, i);
Object.keys(style).forEach(function (prop) {
// eslint-disable-next-line no-param-reassign
gutterElement.style[prop] = style[prop];
});
}
function getSizes() {
return elements.map(function (element) { return element.size; })
}
// Supports touch events, but not multitouch, so only the first
// finger `touches[0]` is counted.
function getMousePosition(e) {
if ('touches' in e) { return e.touches[0][clientAxis] }
return e[clientAxis]
}
// Actually adjust the size of elements `a` and `b` to `offset` while dragging.
// calc is used to allow calc(percentage + gutterpx) on the whole split instance,
// which allows the viewport to be resized without additional logic.
// Element a's size is the same as offset. b's size is total size - a size.
// Both sizes are calculated from the initial parent percentage,
// then the gutter size is subtracted.
function adjust(offset) {
var a = elements[this.a];
var b = elements[this.b];
var percentage = a.size + b.size;
a.size = (offset / this.size) * percentage;
b.size = percentage - (offset / this.size) * percentage;
setElementSize(a.element, a.size, this[aGutterSize], a.i);
setElementSize(b.element, b.size, this[bGutterSize], b.i);
}
// drag, where all the magic happens. The logic is really quite simple:
//
// 1. Ignore if the pair is not dragging.
// 2. Get the offset of the event.
// 3. Snap offset to min if within snappable range (within min + snapOffset).
// 4. Actually adjust each element in the pair to offset.
//
// ---------------------------------------------------------------------
// | | <- a.minSize || b.minSize -> | |
// | | | <- this.snapOffset || this.snapOffset -> | | |
// | | | || | | |
// | | | || | | |
// ---------------------------------------------------------------------
// | <- this.start this.size -> |
function drag(e) {
var offset;
var a = elements[this.a];
var b = elements[this.b];
if (!this.dragging) { return }
// Get the offset of the event from the first side of the
// pair `this.start`. Then offset by the initial position of the
// mouse compared to the gutter size.
offset =
getMousePosition(e) -
this.start +
(this[aGutterSize] - this.dragOffset);
if (dragInterval > 1) {
offset = Math.round(offset / dragInterval) * dragInterval;
}
// If within snapOffset of min or max, set offset to min or max.
// snapOffset buffers a.minSize and b.minSize, so logic is opposite for both.
// Include the appropriate gutter sizes to prevent overflows.
if (offset <= a.minSize + snapOffset + this[aGutterSize]) {
offset = a.minSize + this[aGutterSize];
} else if (
offset >=
this.size - (b.minSize + snapOffset + this[bGutterSize])
) {
offset = this.size - (b.minSize + this[bGutterSize]);
}
// Actually adjust the size.
adjust.call(this, offset);
// Call the drag callback continously. Don't do anything too intensive
// in this callback.
getOption(options, 'onDrag', NOOP)();
}
// Cache some important sizes when drag starts, so we don't have to do that
// continously:
//
// `size`: The total size of the pair. First + second + first gutter + second gutter.
// `start`: The leading side of the first element.
//
// ------------------------------------------------
// | aGutterSize -> ||| |
// | ||| |
// | ||| |
// | ||| <- bGutterSize |
// ------------------------------------------------
// | <- start size -> |
function calculateSizes() {
// Figure out the parent size minus padding.
var a = elements[this.a].element;
var b = elements[this.b].element;
var aBounds = a[getBoundingClientRect]();
var bBounds = b[getBoundingClientRect]();
this.size =
aBounds[dimension] +
bBounds[dimension] +
this[aGutterSize] +
this[bGutterSize];
this.start = aBounds[position];
this.end = aBounds[positionEnd];
}
function innerSize(element) {
// Return nothing if getComputedStyle is not supported (< IE9)
// Or if parent element has no layout yet
if (!getComputedStyle) { return null }
var computedStyle = getComputedStyle(element);
if (!computedStyle) { return null }
var size = element[clientSize];
if (size === 0) { return null }
if (direction === HORIZONTAL) {
size -=
parseFloat(computedStyle.paddingLeft) +
parseFloat(computedStyle.paddingRight);
} else {
size -=
parseFloat(computedStyle.paddingTop) +
parseFloat(computedStyle.paddingBottom);
}
return size
}
// When specifying percentage sizes that are less than the computed
// size of the element minus the gutter, the lesser percentages must be increased
// (and decreased from the other elements) to make space for the pixels
// subtracted by the gutters.
function trimToMin(sizesToTrim) {
// Try to get inner size of parent element.
// If it's no supported, return original sizes.
var parentSize = innerSize(parent);
if (parentSize === null) {
return sizesToTrim
}
if (minSizes.reduce(function (a, b) { return a + b; }, 0) > parentSize) {
return sizesToTrim
}
// Keep track of the excess pixels, the amount of pixels over the desired percentage
// Also keep track of the elements with pixels to spare, to decrease after if needed
var excessPixels = 0;
var toSpare = [];
var pixelSizes = sizesToTrim.map(function (size, i) {
// Convert requested percentages to pixel sizes
var pixelSize = (parentSize * size) / 100;
var elementGutterSize = getGutterSize(
gutterSize,
i === 0,
i === sizesToTrim.length - 1,
gutterAlign
);
var elementMinSize = minSizes[i] + elementGutterSize;
// If element is too smal, increase excess pixels by the difference
// and mark that it has no pixels to spare
if (pixelSize < elementMinSize) {
excessPixels += elementMinSize - pixelSize;
toSpare.push(0);
return elementMinSize
}
// Otherwise, mark the pixels it has to spare and return it's original size
toSpare.push(pixelSize - elementMinSize);
return pixelSize
});
// If nothing was adjusted, return the original sizes
if (excessPixels === 0) {
return sizesToTrim
}
return pixelSizes.map(function (pixelSize, i) {
var newPixelSize = pixelSize;
// While there's still pixels to take, and there's enough pixels to spare,
// take as many as possible up to the total excess pixels
if (excessPixels > 0 && toSpare[i] - excessPixels > 0) {
var takenPixels = Math.min(
excessPixels,
toSpare[i] - excessPixels
);
// Subtract the amount taken for the next iteration
excessPixels -= takenPixels;
newPixelSize = pixelSize - takenPixels;
}
// Return the pixel size adjusted as a percentage
return (newPixelSize / parentSize) * 100
})
}
// stopDragging is very similar to startDragging in reverse.
function stopDragging() {
var self = this;
var a = elements[self.a].element;
var b = elements[self.b].element;
if (self.dragging) {
getOption(options, 'onDragEnd', NOOP)(getSizes());
}
self.dragging = false;
// Remove the stored event listeners. This is why we store them.
global[removeEventListener]('mouseup', self.stop);
global[removeEventListener]('touchend', self.stop);
global[removeEventListener]('touchcancel', self.stop);
global[removeEventListener]('mousemove', self.move);
global[removeEventListener]('touchmove', self.move);
// Clear bound function references
self.stop = null;
self.move = null;
a[removeEventListener]('selectstart', NOOP);
a[removeEventListener]('dragstart', NOOP);
b[removeEventListener]('selectstart', NOOP);
b[removeEventListener]('dragstart', NOOP);
a.style.userSelect = '';
a.style.webkitUserSelect = '';
a.style.MozUserSelect = '';
a.style.pointerEvents = '';
b.style.userSelect = '';
b.style.webkitUserSelect = '';
b.style.MozUserSelect = '';
b.style.pointerEvents = '';
self.gutter.style.cursor = '';
self.parent.style.cursor = '';
document.body.style.cursor = '';
}
// startDragging calls `calculateSizes` to store the inital size in the pair object.
// It also adds event listeners for mouse/touch events,
// and prevents selection while dragging so avoid the selecting text.
function startDragging(e) {
// Right-clicking can't start dragging.
if ('button' in e && e.button !== 0) {
return
}
// Alias frequently used variables to save space. 200 bytes.
var self = this;
var a = elements[self.a].element;
var b = elements[self.b].element;
// 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`.
//
// IE9 and above
if (!isIE8) {
// 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] = '';
});
}
});
}
if (isIE8) {
return {
setSizes: setSizes,
destroy: destroy,
}
}
return {
setSizes: setSizes,
getSizes: getSizes,
collapse: function collapse(i) {
adjustToMin(elements[i]);
},
destroy: destroy,
parent: parent,
pairs: pairs,
}
};
return Split;
})));