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							| @@ -0,0 +1,756 @@ | ||||
| // 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. | ||||
| const global = window | ||||
| const { document } = global | ||||
|  | ||||
| // Save a couple long function names that are used frequently. | ||||
| // This optimization saves around 400 bytes. | ||||
| const addEventListener = 'addEventListener' | ||||
| const removeEventListener = 'removeEventListener' | ||||
| const getBoundingClientRect = 'getBoundingClientRect' | ||||
| const gutterStartDragging = '_a' | ||||
| const aGutterSize = '_b' | ||||
| const bGutterSize = '_c' | ||||
| const HORIZONTAL = 'horizontal' | ||||
| const NOOP = () => false | ||||
|  | ||||
| // Figure out if we're in IE8 or not. IE8 will still render correctly, | ||||
| // but will be static instead of draggable. | ||||
| const 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 | ||||
| const calc = `${['', '-webkit-', '-moz-', '-o-'] | ||||
|     .filter(prefix => { | ||||
|         const el = document.createElement('div') | ||||
|         el.style.cssText = `width:${prefix}calc(9px)` | ||||
|  | ||||
|         return !!el.style.length | ||||
|     }) | ||||
|     .shift()}calc` | ||||
|  | ||||
| // Helper function checks if its argument is a string-like type | ||||
| const isString = v => 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'])`. | ||||
| const elementOrSelector = el => { | ||||
|     if (isString(el)) { | ||||
|         const ele = document.querySelector(el) | ||||
|         if (!ele) { | ||||
|             throw new Error(`Selector ${el} did not match a DOM element`) | ||||
|         } | ||||
|         return ele | ||||
|     } | ||||
|  | ||||
|     return el | ||||
| } | ||||
|  | ||||
| // Helper function gets a property from the properties object, with a default fallback | ||||
| const getOption = (options, propName, def) => { | ||||
|     const value = options[propName] | ||||
|     if (value !== undefined) { | ||||
|         return value | ||||
|     } | ||||
|     return def | ||||
| } | ||||
|  | ||||
| const getGutterSize = (gutterSize, isFirst, isLast, gutterAlign) => { | ||||
|     if (isFirst) { | ||||
|         if (gutterAlign === 'end') { | ||||
|             return 0 | ||||
|         } | ||||
|         if (gutterAlign === 'center') { | ||||
|             return gutterSize / 2 | ||||
|         } | ||||
|     } else if (isLast) { | ||||
|         if (gutterAlign === 'start') { | ||||
|             return 0 | ||||
|         } | ||||
|         if (gutterAlign === 'center') { | ||||
|             return gutterSize / 2 | ||||
|         } | ||||
|     } | ||||
|  | ||||
|     return gutterSize | ||||
| } | ||||
|  | ||||
| // Default options | ||||
| const defaultGutterFn = (i, gutterDirection) => { | ||||
|     const gut = document.createElement('div') | ||||
|     gut.className = `gutter gutter-${gutterDirection}` | ||||
|     return gut | ||||
| } | ||||
|  | ||||
| const defaultElementStyleFn = (dim, size, gutSize) => { | ||||
|     const style = {} | ||||
|  | ||||
|     if (!isString(size)) { | ||||
|         if (!isIE8) { | ||||
|             style[dim] = `${calc}(${size}% - ${gutSize}px)` | ||||
|         } else { | ||||
|             style[dim] = `${size}%` | ||||
|         } | ||||
|     } else { | ||||
|         style[dim] = size | ||||
|     } | ||||
|  | ||||
|     return style | ||||
| } | ||||
|  | ||||
| const defaultGutterStyleFn = (dim, gutSize) => ({ [dim]: `${gutSize}px` }) | ||||
|  | ||||
| // 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. | ||||
| const Split = (idsOption, options = {}) => { | ||||
|     let ids = idsOption | ||||
|     let dimension | ||||
|     let clientAxis | ||||
|     let position | ||||
|     let positionEnd | ||||
|     let clientSize | ||||
|     let 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. | ||||
|     const firstElement = elementOrSelector(ids[0]) | ||||
|     const parent = firstElement.parentNode | ||||
|     const parentFlexDirection = getComputedStyle | ||||
|         ? getComputedStyle(parent).flexDirection | ||||
|         : null | ||||
|  | ||||
|     // Set default options.sizes to equal percentages of the parent element. | ||||
|     let sizes = getOption(options, 'sizes') || ids.map(() => 100 / ids.length) | ||||
|  | ||||
|     // Standardize minSize to an array if it isn't already. This allows minSize | ||||
|     // to be passed as a number. | ||||
|     const minSize = getOption(options, 'minSize', 100) | ||||
|     const minSizes = Array.isArray(minSize) ? minSize : ids.map(() => minSize) | ||||
|  | ||||
|     // Get other options | ||||
|     const expandToMin = getOption(options, 'expandToMin', false) | ||||
|     const gutterSize = getOption(options, 'gutterSize', 10) | ||||
|     const gutterAlign = getOption(options, 'gutterAlign', 'center') | ||||
|     const snapOffset = getOption(options, 'snapOffset', 30) | ||||
|     const dragInterval = getOption(options, 'dragInterval', 1) | ||||
|     const direction = getOption(options, 'direction', HORIZONTAL) | ||||
|     const cursor = getOption( | ||||
|         options, | ||||
|         'cursor', | ||||
|         direction === HORIZONTAL ? 'col-resize' : 'row-resize', | ||||
|     ) | ||||
|     const gutter = getOption(options, 'gutter', defaultGutterFn) | ||||
|     const elementStyle = getOption( | ||||
|         options, | ||||
|         'elementStyle', | ||||
|         defaultElementStyleFn, | ||||
|     ) | ||||
|     const 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. | ||||
|         const style = elementStyle(dimension, size, gutSize, i) | ||||
|  | ||||
|         Object.keys(style).forEach(prop => { | ||||
|             // eslint-disable-next-line no-param-reassign | ||||
|             el.style[prop] = style[prop] | ||||
|         }) | ||||
|     } | ||||
|  | ||||
|     function setGutterSize(gutterElement, gutSize, i) { | ||||
|         const style = gutterStyle(dimension, gutSize, i) | ||||
|  | ||||
|         Object.keys(style).forEach(prop => { | ||||
|             // eslint-disable-next-line no-param-reassign | ||||
|             gutterElement.style[prop] = style[prop] | ||||
|         }) | ||||
|     } | ||||
|  | ||||
|     function getSizes() { | ||||
|         return elements.map(element => 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) { | ||||
|         const a = elements[this.a] | ||||
|         const b = elements[this.b] | ||||
|         const 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) { | ||||
|         let offset | ||||
|         const a = elements[this.a] | ||||
|         const 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. | ||||
|         const a = elements[this.a].element | ||||
|         const b = elements[this.b].element | ||||
|  | ||||
|         const aBounds = a[getBoundingClientRect]() | ||||
|         const 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) | ||||
|         if (!getComputedStyle) return null | ||||
|  | ||||
|         const computedStyle = getComputedStyle(element) | ||||
|         let size = element[clientSize] | ||||
|  | ||||
|         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. | ||||
|         const parentSize = innerSize(parent) | ||||
|         if (parentSize === null) { | ||||
|             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 | ||||
|         let excessPixels = 0 | ||||
|         const toSpare = [] | ||||
|  | ||||
|         const pixelSizes = sizesToTrim.map((size, i) => { | ||||
|             // Convert requested percentages to pixel sizes | ||||
|             const pixelSize = (parentSize * size) / 100 | ||||
|             const elementGutterSize = getGutterSize( | ||||
|                 gutterSize, | ||||
|                 i === 0, | ||||
|                 i === sizesToTrim.length - 1, | ||||
|                 gutterAlign, | ||||
|             ) | ||||
|             const 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((pixelSize, i) => { | ||||
|             let 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) { | ||||
|                 const 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() { | ||||
|         const self = this | ||||
|         const a = elements[self.a].element | ||||
|         const 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. | ||||
|         const self = this | ||||
|         const a = elements[self.a].element | ||||
|         const 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           | | ||||
|     // |             |                     |                  |              | | ||||
|     // ----------------------------------------------------------------------- | ||||
|     const pairs = [] | ||||
|     elements = ids.map((id, i) => { | ||||
|         // Create the element object. | ||||
|         const element = { | ||||
|             element: elementOrSelector(id), | ||||
|             size: sizes[i], | ||||
|             minSize: minSizes[i], | ||||
|             i, | ||||
|         } | ||||
|  | ||||
|         let pair | ||||
|  | ||||
|         if (i > 0) { | ||||
|             // Create the pair object with its metadata. | ||||
|             pair = { | ||||
|                 a: i - 1, | ||||
|                 b: i, | ||||
|                 dragging: false, | ||||
|                 direction, | ||||
|                 parent, | ||||
|             } | ||||
|  | ||||
|             pair[aGutterSize] = getGutterSize( | ||||
|                 gutterSize, | ||||
|                 i - 1 === 0, | ||||
|                 false, | ||||
|                 gutterAlign, | ||||
|             ) | ||||
|             pair[bGutterSize] = getGutterSize( | ||||
|                 gutterSize, | ||||
|                 false, | ||||
|                 i === ids.length - 1, | ||||
|                 gutterAlign, | ||||
|             ) | ||||
|  | ||||
|             // if the parent has a reverse flex-direction, switch the pair elements. | ||||
|             if ( | ||||
|                 parentFlexDirection === 'row-reverse' || | ||||
|                 parentFlexDirection === 'column-reverse' | ||||
|             ) { | ||||
|                 const temp = pair.a | ||||
|                 pair.a = pair.b | ||||
|                 pair.b = temp | ||||
|             } | ||||
|         } | ||||
|  | ||||
|         // Determine the size of the current element. IE8 is supported by | ||||
|         // staticly assigning sizes without draggable gutters. Assigns a string | ||||
|         // to `size`. | ||||
|         // | ||||
|         // IE9 and above | ||||
|         if (!isIE8) { | ||||
|             // Create gutter elements for each pair. | ||||
|             if (i > 0) { | ||||
|                 const gutterElement = gutter(i, direction, element.element) | ||||
|                 setGutterSize(gutterElement, gutterSize, i) | ||||
|  | ||||
|                 // Save bound event listener for removal later | ||||
|                 pair[gutterStartDragging] = startDragging.bind(pair) | ||||
|  | ||||
|                 // Attach bound event listener | ||||
|                 gutterElement[addEventListener]( | ||||
|                     'mousedown', | ||||
|                     pair[gutterStartDragging], | ||||
|                 ) | ||||
|                 gutterElement[addEventListener]( | ||||
|                     'touchstart', | ||||
|                     pair[gutterStartDragging], | ||||
|                 ) | ||||
|  | ||||
|                 parent.insertBefore(gutterElement, element.element) | ||||
|  | ||||
|                 pair.gutter = gutterElement | ||||
|             } | ||||
|         } | ||||
|  | ||||
|         setElementSize( | ||||
|             element.element, | ||||
|             element.size, | ||||
|             getGutterSize( | ||||
|                 gutterSize, | ||||
|                 i === 0, | ||||
|                 i === ids.length - 1, | ||||
|                 gutterAlign, | ||||
|             ), | ||||
|         ) | ||||
|  | ||||
|         // After the first iteration, and we have a pair object, append it to the | ||||
|         // list of pairs. | ||||
|         if (i > 0) { | ||||
|             pairs.push(pair) | ||||
|         } | ||||
|  | ||||
|         return element | ||||
|     }) | ||||
|  | ||||
|     function adjustToMin(element) { | ||||
|         const isLast = element.i === pairs.length | ||||
|         const pair = isLast ? pairs[element.i - 1] : pairs[element.i] | ||||
|  | ||||
|         calculateSizes.call(pair) | ||||
|  | ||||
|         const size = isLast | ||||
|             ? pair.size - element.minSize - pair[bGutterSize] | ||||
|             : element.minSize + pair[aGutterSize] | ||||
|  | ||||
|         adjust.call(pair, size) | ||||
|     } | ||||
|  | ||||
|     elements.forEach(element => { | ||||
|         const computedSize = element.element[getBoundingClientRect]()[dimension] | ||||
|  | ||||
|         if (computedSize < element.minSize) { | ||||
|             if (expandToMin) { | ||||
|                 adjustToMin(element) | ||||
|             } else { | ||||
|                 // eslint-disable-next-line no-param-reassign | ||||
|                 element.minSize = computedSize | ||||
|             } | ||||
|         } | ||||
|     }) | ||||
|  | ||||
|     function setSizes(newSizes) { | ||||
|         const trimmed = trimToMin(newSizes) | ||||
|         trimmed.forEach((newSize, i) => { | ||||
|             if (i > 0) { | ||||
|                 const pair = pairs[i - 1] | ||||
|  | ||||
|                 const a = elements[pair.a] | ||||
|                 const b = elements[pair.b] | ||||
|  | ||||
|                 a.size = trimmed[i - 1] | ||||
|                 b.size = newSize | ||||
|  | ||||
|                 setElementSize(a.element, a.size, pair[aGutterSize]) | ||||
|                 setElementSize(b.element, b.size, pair[bGutterSize]) | ||||
|             } | ||||
|         }) | ||||
|     } | ||||
|  | ||||
|     function destroy(preserveStyles, preserveGutter) { | ||||
|         pairs.forEach(pair => { | ||||
|             if (preserveGutter !== true) { | ||||
|                 pair.parent.removeChild(pair.gutter) | ||||
|             } else { | ||||
|                 pair.gutter[removeEventListener]( | ||||
|                     'mousedown', | ||||
|                     pair[gutterStartDragging], | ||||
|                 ) | ||||
|                 pair.gutter[removeEventListener]( | ||||
|                     'touchstart', | ||||
|                     pair[gutterStartDragging], | ||||
|                 ) | ||||
|             } | ||||
|  | ||||
|             if (preserveStyles !== true) { | ||||
|                 const style = elementStyle( | ||||
|                     dimension, | ||||
|                     pair.a.size, | ||||
|                     pair[aGutterSize], | ||||
|                 ) | ||||
|  | ||||
|                 Object.keys(style).forEach(prop => { | ||||
|                     elements[pair.a].element.style[prop] = '' | ||||
|                     elements[pair.b].element.style[prop] = '' | ||||
|                 }) | ||||
|             } | ||||
|         }) | ||||
|     } | ||||
|  | ||||
|     if (isIE8) { | ||||
|         return { | ||||
|             setSizes, | ||||
|             destroy, | ||||
|         } | ||||
|     } | ||||
|  | ||||
|     return { | ||||
|         setSizes, | ||||
|         getSizes, | ||||
|         collapse(i) { | ||||
|             adjustToMin(elements[i]) | ||||
|         }, | ||||
|         destroy, | ||||
|         parent, | ||||
|         pairs, | ||||
|     } | ||||
| } | ||||
|  | ||||
| export default Split | ||||
		Reference in New Issue
	
	Block a user