aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/twbs/bootstrap/js/src/carousel.js
blob: bb894e9c3701b8e11a722933f2bf20771e106556 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
/**
 * --------------------------------------------------------------------------
 * Bootstrap (v5.0.1): carousel.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */

import {
  defineJQueryPlugin,
  getElementFromSelector,
  isRTL,
  isVisible,
  reflow,
  triggerTransitionEnd,
  typeCheckConfig
} from './util/index'
import Data from './dom/data'
import EventHandler from './dom/event-handler'
import Manipulator from './dom/manipulator'
import SelectorEngine from './dom/selector-engine'
import BaseComponent from './base-component'

/**
 * ------------------------------------------------------------------------
 * Constants
 * ------------------------------------------------------------------------
 */

const NAME = 'carousel'
const DATA_KEY = 'bs.carousel'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'

const ARROW_LEFT_KEY = 'ArrowLeft'
const ARROW_RIGHT_KEY = 'ArrowRight'
const TOUCHEVENT_COMPAT_WAIT = 500 // Time for mouse compat events to fire after touch
const SWIPE_THRESHOLD = 40

const Default = {
  interval: 5000,
  keyboard: true,
  slide: false,
  pause: 'hover',
  wrap: true,
  touch: true
}

const DefaultType = {
  interval: '(number|boolean)',
  keyboard: 'boolean',
  slide: '(boolean|string)',
  pause: '(string|boolean)',
  wrap: 'boolean',
  touch: 'boolean'
}

const ORDER_NEXT = 'next'
const ORDER_PREV = 'prev'
const DIRECTION_LEFT = 'left'
const DIRECTION_RIGHT = 'right'

const EVENT_SLIDE = `slide${EVENT_KEY}`
const EVENT_SLID = `slid${EVENT_KEY}`
const EVENT_KEYDOWN = `keydown${EVENT_KEY}`
const EVENT_MOUSEENTER = `mouseenter${EVENT_KEY}`
const EVENT_MOUSELEAVE = `mouseleave${EVENT_KEY}`
const EVENT_TOUCHSTART = `touchstart${EVENT_KEY}`
const EVENT_TOUCHMOVE = `touchmove${EVENT_KEY}`
const EVENT_TOUCHEND = `touchend${EVENT_KEY}`
const EVENT_POINTERDOWN = `pointerdown${EVENT_KEY}`
const EVENT_POINTERUP = `pointerup${EVENT_KEY}`
const EVENT_DRAG_START = `dragstart${EVENT_KEY}`
const EVENT_LOAD_DATA_API = `load${EVENT_KEY}${DATA_API_KEY}`
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`

const CLASS_NAME_CAROUSEL = 'carousel'
const CLASS_NAME_ACTIVE = 'active'
const CLASS_NAME_SLIDE = 'slide'
const CLASS_NAME_END = 'carousel-item-end'
const CLASS_NAME_START = 'carousel-item-start'
const CLASS_NAME_NEXT = 'carousel-item-next'
const CLASS_NAME_PREV = 'carousel-item-prev'
const CLASS_NAME_POINTER_EVENT = 'pointer-event'

const SELECTOR_ACTIVE = '.active'
const SELECTOR_ACTIVE_ITEM = '.active.carousel-item'
const SELECTOR_ITEM = '.carousel-item'
const SELECTOR_ITEM_IMG = '.carousel-item img'
const SELECTOR_NEXT_PREV = '.carousel-item-next, .carousel-item-prev'
const SELECTOR_INDICATORS = '.carousel-indicators'
const SELECTOR_INDICATOR = '[data-bs-target]'
const SELECTOR_DATA_SLIDE = '[data-bs-slide], [data-bs-slide-to]'
const SELECTOR_DATA_RIDE = '[data-bs-ride="carousel"]'

const POINTER_TYPE_TOUCH = 'touch'
const POINTER_TYPE_PEN = 'pen'

/**
 * ------------------------------------------------------------------------
 * Class Definition
 * ------------------------------------------------------------------------
 */
class Carousel extends BaseComponent {
  constructor(element, config) {
    super(element)

    this._items = null
    this._interval = null
    this._activeElement = null
    this._isPaused = false
    this._isSliding = false
    this.touchTimeout = null
    this.touchStartX = 0
    this.touchDeltaX = 0

    this._config = this._getConfig(config)
    this._indicatorsElement = SelectorEngine.findOne(SELECTOR_INDICATORS, this._element)
    this._touchSupported = 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0
    this._pointerEvent = Boolean(window.PointerEvent)

    this._addEventListeners()
  }

  // Getters

  static get Default() {
    return Default
  }

  static get NAME() {
    return NAME
  }

  // Public

  next() {
    if (!this._isSliding) {
      this._slide(ORDER_NEXT)
    }
  }

  nextWhenVisible() {
    // Don't call next when the page isn't visible
    // or the carousel or its parent isn't visible
    if (!document.hidden && isVisible(this._element)) {
      this.next()
    }
  }

  prev() {
    if (!this._isSliding) {
      this._slide(ORDER_PREV)
    }
  }

  pause(event) {
    if (!event) {
      this._isPaused = true
    }

    if (SelectorEngine.findOne(SELECTOR_NEXT_PREV, this._element)) {
      triggerTransitionEnd(this._element)
      this.cycle(true)
    }

    clearInterval(this._interval)
    this._interval = null
  }

  cycle(event) {
    if (!event) {
      this._isPaused = false
    }

    if (this._interval) {
      clearInterval(this._interval)
      this._interval = null
    }

    if (this._config && this._config.interval && !this._isPaused) {
      this._updateInterval()

      this._interval = setInterval(
        (document.visibilityState ? this.nextWhenVisible : this.next).bind(this),
        this._config.interval
      )
    }
  }

  to(index) {
    this._activeElement = SelectorEngine.findOne(SELECTOR_ACTIVE_ITEM, this._element)
    const activeIndex = this._getItemIndex(this._activeElement)

    if (index > this._items.length - 1 || index < 0) {
      return
    }

    if (this._isSliding) {
      EventHandler.one(this._element, EVENT_SLID, () => this.to(index))
      return
    }

    if (activeIndex === index) {
      this.pause()
      this.cycle()
      return
    }

    const order = index > activeIndex ?
      ORDER_NEXT :
      ORDER_PREV

    this._slide(order, this._items[index])
  }

  // Private

  _getConfig(config) {
    config = {
      ...Default,
      ...config
    }
    typeCheckConfig(NAME, config, DefaultType)
    return config
  }

  _handleSwipe() {
    const absDeltax = Math.abs(this.touchDeltaX)

    if (absDeltax <= SWIPE_THRESHOLD) {
      return
    }

    const direction = absDeltax / this.touchDeltaX

    this.touchDeltaX = 0

    if (!direction) {
      return
    }

    this._slide(direction > 0 ? DIRECTION_RIGHT : DIRECTION_LEFT)
  }

  _addEventListeners() {
    if (this._config.keyboard) {
      EventHandler.on(this._element, EVENT_KEYDOWN, event => this._keydown(event))
    }

    if (this._config.pause === 'hover') {
      EventHandler.on(this._element, EVENT_MOUSEENTER, event => this.pause(event))
      EventHandler.on(this._element, EVENT_MOUSELEAVE, event => this.cycle(event))
    }

    if (this._config.touch && this._touchSupported) {
      this._addTouchEventListeners()
    }
  }

  _addTouchEventListeners() {
    const start = event => {
      if (this._pointerEvent && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH)) {
        this.touchStartX = event.clientX
      } else if (!this._pointerEvent) {
        this.touchStartX = event.touches[0].clientX
      }
    }

    const move = event => {
      // ensure swiping with one touch and not pinching
      this.touchDeltaX = event.touches && event.touches.length > 1 ?
        0 :
        event.touches[0].clientX - this.touchStartX
    }

    const end = event => {
      if (this._pointerEvent && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH)) {
        this.touchDeltaX = event.clientX - this.touchStartX
      }

      this._handleSwipe()
      if (this._config.pause === 'hover') {
        // If it's a touch-enabled device, mouseenter/leave are fired as
        // part of the mouse compatibility events on first tap - the carousel
        // would stop cycling until user tapped out of it;
        // here, we listen for touchend, explicitly pause the carousel
        // (as if it's the second time we tap on it, mouseenter compat event
        // is NOT fired) and after a timeout (to allow for mouse compatibility
        // events to fire) we explicitly restart cycling

        this.pause()
        if (this.touchTimeout) {
          clearTimeout(this.touchTimeout)
        }

        this.touchTimeout = setTimeout(event => this.cycle(event), TOUCHEVENT_COMPAT_WAIT + this._config.interval)
      }
    }

    SelectorEngine.find(SELECTOR_ITEM_IMG, this._element).forEach(itemImg => {
      EventHandler.on(itemImg, EVENT_DRAG_START, e => e.preventDefault())
    })

    if (this._pointerEvent) {
      EventHandler.on(this._element, EVENT_POINTERDOWN, event => start(event))
      EventHandler.on(this._element, EVENT_POINTERUP, event => end(event))

      this._element.classList.add(CLASS_NAME_POINTER_EVENT)
    } else {
      EventHandler.on(this._element, EVENT_TOUCHSTART, event => start(event))
      EventHandler.on(this._element, EVENT_TOUCHMOVE, event => move(event))
      EventHandler.on(this._element, EVENT_TOUCHEND, event => end(event))
    }
  }

  _keydown(event) {
    if (/input|textarea/i.test(event.target.tagName)) {
      return
    }

    if (event.key === ARROW_LEFT_KEY) {
      event.preventDefault()
      this._slide(DIRECTION_RIGHT)
    } else if (event.key === ARROW_RIGHT_KEY) {
      event.preventDefault()
      this._slide(DIRECTION_LEFT)
    }
  }

  _getItemIndex(element) {
    this._items = element && element.parentNode ?
      SelectorEngine.find(SELECTOR_ITEM, element.parentNode) :
      []

    return this._items.indexOf(element)
  }

  _getItemByOrder(order, activeElement) {
    const isNext = order === ORDER_NEXT
    const isPrev = order === ORDER_PREV
    const activeIndex = this._getItemIndex(activeElement)
    const lastItemIndex = this._items.length - 1
    const isGoingToWrap = (isPrev && activeIndex === 0) || (isNext && activeIndex === lastItemIndex)

    if (isGoingToWrap && !this._config.wrap) {
      return activeElement
    }

    const delta = isPrev ? -1 : 1
    const itemIndex = (activeIndex + delta) % this._items.length

    return itemIndex === -1 ?
      this._items[this._items.length - 1] :
      this._items[itemIndex]
  }

  _triggerSlideEvent(relatedTarget, eventDirectionName) {
    const targetIndex = this._getItemIndex(relatedTarget)
    const fromIndex = this._getItemIndex(SelectorEngine.findOne(SELECTOR_ACTIVE_ITEM, this._element))

    return EventHandler.trigger(this._element, EVENT_SLIDE, {
      relatedTarget,
      direction: eventDirectionName,
      from: fromIndex,
      to: targetIndex
    })
  }

  _setActiveIndicatorElement(element) {
    if (this._indicatorsElement) {
      const activeIndicator = SelectorEngine.findOne(SELECTOR_ACTIVE, this._indicatorsElement)

      activeIndicator.classList.remove(CLASS_NAME_ACTIVE)
      activeIndicator.removeAttribute('aria-current')

      const indicators = SelectorEngine.find(SELECTOR_INDICATOR, this._indicatorsElement)

      for (let i = 0; i < indicators.length; i++) {
        if (Number.parseInt(indicators[i].getAttribute('data-bs-slide-to'), 10) === this._getItemIndex(element)) {
          indicators[i].classList.add(CLASS_NAME_ACTIVE)
          indicators[i].setAttribute('aria-current', 'true')
          break
        }
      }
    }
  }

  _updateInterval() {
    const element = this._activeElement || SelectorEngine.findOne(SELECTOR_ACTIVE_ITEM, this._element)

    if (!element) {
      return
    }

    const elementInterval = Number.parseInt(element.getAttribute('data-bs-interval'), 10)

    if (elementInterval) {
      this._config.defaultInterval = this._config.defaultInterval || this._config.interval
      this._config.interval = elementInterval
    } else {
      this._config.interval = this._config.defaultInterval || this._config.interval
    }
  }

  _slide(directionOrOrder, element) {
    const order = this._directionToOrder(directionOrOrder)
    const activeElement = SelectorEngine.findOne(SELECTOR_ACTIVE_ITEM, this._element)
    const activeElementIndex = this._getItemIndex(activeElement)
    const nextElement = element || this._getItemByOrder(order, activeElement)

    const nextElementIndex = this._getItemIndex(nextElement)
    const isCycling = Boolean(this._interval)

    const isNext = order === ORDER_NEXT
    const directionalClassName = isNext ? CLASS_NAME_START : CLASS_NAME_END
    const orderClassName = isNext ? CLASS_NAME_NEXT : CLASS_NAME_PREV
    const eventDirectionName = this._orderToDirection(order)

    if (nextElement && nextElement.classList.contains(CLASS_NAME_ACTIVE)) {
      this._isSliding = false
      return
    }

    const slideEvent = this._triggerSlideEvent(nextElement, eventDirectionName)
    if (slideEvent.defaultPrevented) {
      return
    }

    if (!activeElement || !nextElement) {
      // Some weirdness is happening, so we bail
      return
    }

    this._isSliding = true

    if (isCycling) {
      this.pause()
    }

    this._setActiveIndicatorElement(nextElement)
    this._activeElement = nextElement

    const triggerSlidEvent = () => {
      EventHandler.trigger(this._element, EVENT_SLID, {
        relatedTarget: nextElement,
        direction: eventDirectionName,
        from: activeElementIndex,
        to: nextElementIndex
      })
    }

    if (this._element.classList.contains(CLASS_NAME_SLIDE)) {
      nextElement.classList.add(orderClassName)

      reflow(nextElement)

      activeElement.classList.add(directionalClassName)
      nextElement.classList.add(directionalClassName)

      const completeCallBack = () => {
        nextElement.classList.remove(directionalClassName, orderClassName)
        nextElement.classList.add(CLASS_NAME_ACTIVE)

        activeElement.classList.remove(CLASS_NAME_ACTIVE, orderClassName, directionalClassName)

        this._isSliding = false

        setTimeout(triggerSlidEvent, 0)
      }

      this._queueCallback(completeCallBack, activeElement, true)
    } else {
      activeElement.classList.remove(CLASS_NAME_ACTIVE)
      nextElement.classList.add(CLASS_NAME_ACTIVE)

      this._isSliding = false
      triggerSlidEvent()
    }

    if (isCycling) {
      this.cycle()
    }
  }

  _directionToOrder(direction) {
    if (![DIRECTION_RIGHT, DIRECTION_LEFT].includes(direction)) {
      return direction
    }

    if (isRTL()) {
      return direction === DIRECTION_LEFT ? ORDER_PREV : ORDER_NEXT
    }

    return direction === DIRECTION_LEFT ? ORDER_NEXT : ORDER_PREV
  }

  _orderToDirection(order) {
    if (![ORDER_NEXT, ORDER_PREV].includes(order)) {
      return order
    }

    if (isRTL()) {
      return order === ORDER_PREV ? DIRECTION_LEFT : DIRECTION_RIGHT
    }

    return order === ORDER_PREV ? DIRECTION_RIGHT : DIRECTION_LEFT
  }

  // Static

  static carouselInterface(element, config) {
    let data = Data.get(element, DATA_KEY)
    let _config = {
      ...Default,
      ...Manipulator.getDataAttributes(element)
    }

    if (typeof config === 'object') {
      _config = {
        ..._config,
        ...config
      }
    }

    const action = typeof config === 'string' ? config : _config.slide

    if (!data) {
      data = new Carousel(element, _config)
    }

    if (typeof config === 'number') {
      data.to(config)
    } else if (typeof action === 'string') {
      if (typeof data[action] === 'undefined') {
        throw new TypeError(`No method named "${action}"`)
      }

      data[action]()
    } else if (_config.interval && _config.ride) {
      data.pause()
      data.cycle()
    }
  }

  static jQueryInterface(config) {
    return this.each(function () {
      Carousel.carouselInterface(this, config)
    })
  }

  static dataApiClickHandler(event) {
    const target = getElementFromSelector(this)

    if (!target || !target.classList.contains(CLASS_NAME_CAROUSEL)) {
      return
    }

    const config = {
      ...Manipulator.getDataAttributes(target),
      ...Manipulator.getDataAttributes(this)
    }
    const slideIndex = this.getAttribute('data-bs-slide-to')

    if (slideIndex) {
      config.interval = false
    }

    Carousel.carouselInterface(target, config)

    if (slideIndex) {
      Data.get(target, DATA_KEY).to(slideIndex)
    }

    event.preventDefault()
  }
}

/**
 * ------------------------------------------------------------------------
 * Data Api implementation
 * ------------------------------------------------------------------------
 */

EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_SLIDE, Carousel.dataApiClickHandler)

EventHandler.on(window, EVENT_LOAD_DATA_API, () => {
  const carousels = SelectorEngine.find(SELECTOR_DATA_RIDE)

  for (let i = 0, len = carousels.length; i < len; i++) {
    Carousel.carouselInterface(carousels[i], Data.get(carousels[i], DATA_KEY))
  }
})

/**
 * ------------------------------------------------------------------------
 * jQuery
 * ------------------------------------------------------------------------
 * add .Carousel to jQuery only if jQuery is present
 */

defineJQueryPlugin(Carousel)

export default Carousel