vue-files-preview-inno/es/node_modules/epubjs/src/managers/helpers/snap.mjs.map

A tool for previewing files such as doc, excel, pdf, image, markdown, txt, audio, and video and so on.

{"version":3,"file":"snap.mjs","sources":["../../../../../../../node_modules/epubjs/src/managers/helpers/snap.js"],"sourcesContent":["import {extend, defer, requestAnimationFrame, prefixed} from \"../../utils/core\";\nimport { EVENTS, DOM_EVENTS } from \"../../utils/constants\";\nimport EventEmitter from \"event-emitter\";\n\n// easing equations from https://github.com/danro/easing-js/blob/master/easing.js\nconst PI_D2 = (Math.PI / 2);\nconst EASING_EQUATIONS = {\n\t\teaseOutSine: function (pos) {\n\t\t\t\treturn Math.sin(pos * PI_D2);\n\t\t},\n\t\teaseInOutSine: function (pos) {\n\t\t\t\treturn (-0.5 * (Math.cos(Math.PI * pos) - 1));\n\t\t},\n\t\teaseInOutQuint: function (pos) {\n\t\t\t\tif ((pos /= 0.5) < 1) {\n\t\t\t\t\t\treturn 0.5 * Math.pow(pos, 5);\n\t\t\t\t}\n\t\t\t\treturn 0.5 * (Math.pow((pos - 2), 5) + 2);\n\t\t},\n\t\teaseInCubic: function(pos) {\n\t\t\treturn Math.pow(pos, 3);\n  \t}\n};\n\nclass Snap {\n\tconstructor(manager, options) {\n\n\t\tthis.settings = extend({\n\t\t\tduration: 80,\n\t\t\tminVelocity: 0.2,\n\t\t\tminDistance: 10,\n\t\t\teasing: EASING_EQUATIONS['easeInCubic']\n\t\t}, options || {});\n\n\t\tthis.supportsTouch = this.supportsTouch();\n\n\t\tif (this.supportsTouch) {\n\t\t\tthis.setup(manager);\n\t\t}\n\t}\n\n\tsetup(manager) {\n\t\tthis.manager = manager;\n\n\t\tthis.layout = this.manager.layout;\n\n\t\tthis.fullsize = this.manager.settings.fullsize;\n\t\tif (this.fullsize) {\n\t\t\tthis.element = this.manager.stage.element;\n\t\t\tthis.scroller = window;\n\t\t\tthis.disableScroll();\n\t\t} else {\n\t\t\tthis.element = this.manager.stage.container;\n\t\t\tthis.scroller = this.element;\n\t\t\tthis.element.style[\"WebkitOverflowScrolling\"] = \"touch\";\n\t\t}\n\n\t\t// this.overflow = this.manager.overflow;\n\n\t\t// set lookahead offset to page width\n\t\tthis.manager.settings.offset = this.layout.width;\n\t\tthis.manager.settings.afterScrolledTimeout = this.settings.duration * 2;\n\n\t\tthis.isVertical = this.manager.settings.axis === \"vertical\";\n\n\t\t// disable snapping if not paginated or axis in not horizontal\n\t\tif (!this.manager.isPaginated || this.isVertical) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.touchCanceler = false;\n\t\tthis.resizeCanceler = false;\n\t\tthis.snapping = false;\n\n\n\t\tthis.scrollLeft;\n\t\tthis.scrollTop;\n\n\t\tthis.startTouchX = undefined;\n\t\tthis.startTouchY = undefined;\n\t\tthis.startTime = undefined;\n\t\tthis.endTouchX = undefined;\n\t\tthis.endTouchY = undefined;\n\t\tthis.endTime = undefined;\n\n\t\tthis.addListeners();\n\t}\n\n\tsupportsTouch() {\n\t\tif (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\tdisableScroll() {\n\t\tthis.element.style.overflow = \"hidden\";\n\t}\n\n\tenableScroll() {\n\t\tthis.element.style.overflow = \"\";\n\t}\n\n\taddListeners() {\n\t\tthis._onResize = this.onResize.bind(this);\n\t\twindow.addEventListener('resize', this._onResize);\n\n\t\tthis._onScroll = this.onScroll.bind(this);\n\t\tthis.scroller.addEventListener('scroll', this._onScroll);\n\n\t\tthis._onTouchStart = this.onTouchStart.bind(this);\n\t\tthis.scroller.addEventListener('touchstart', this._onTouchStart, { passive: true });\n\t\tthis.on('touchstart', this._onTouchStart);\n\n\t\tthis._onTouchMove = this.onTouchMove.bind(this);\n\t\tthis.scroller.addEventListener('touchmove', this._onTouchMove, { passive: true });\n\t\tthis.on('touchmove', this._onTouchMove);\n\n\t\tthis._onTouchEnd = this.onTouchEnd.bind(this);\n\t\tthis.scroller.addEventListener('touchend', this._onTouchEnd, { passive: true });\n\t\tthis.on('touchend', this._onTouchEnd);\n\n\t\tthis._afterDisplayed = this.afterDisplayed.bind(this);\n\t\tthis.manager.on(EVENTS.MANAGERS.ADDED, this._afterDisplayed);\n\t}\n\n\tremoveListeners() {\n\t\twindow.removeEventListener('resize', this._onResize);\n\t\tthis._onResize = undefined;\n\n\t\tthis.scroller.removeEventListener('scroll', this._onScroll);\n\t\tthis._onScroll = undefined;\n\n\t\tthis.scroller.removeEventListener('touchstart', this._onTouchStart, { passive: true });\n\t\tthis.off('touchstart', this._onTouchStart);\n\t\tthis._onTouchStart = undefined;\n\n\t\tthis.scroller.removeEventListener('touchmove', this._onTouchMove, { passive: true });\n\t\tthis.off('touchmove', this._onTouchMove);\n\t\tthis._onTouchMove = undefined;\n\n\t\tthis.scroller.removeEventListener('touchend', this._onTouchEnd, { passive: true });\n\t\tthis.off('touchend', this._onTouchEnd);\n\t\tthis._onTouchEnd = undefined;\n\n\t\tthis.manager.off(EVENTS.MANAGERS.ADDED, this._afterDisplayed);\n\t\tthis._afterDisplayed = undefined;\n\t}\n\n\tafterDisplayed(view) {\n\t\tlet contents = view.contents;\n\t\t[\"touchstart\", \"touchmove\", \"touchend\"].forEach((e) => {\n\t\t\tcontents.on(e, (ev) => this.triggerViewEvent(ev, contents));\n\t\t});\n\t}\n\n\ttriggerViewEvent(e, contents){\n\t\tthis.emit(e.type, e, contents);\n\t}\n\n\tonScroll(e) {\n\t\tthis.scrollLeft = this.fullsize ? window.scrollX : this.scroller.scrollLeft;\n\t\tthis.scrollTop = this.fullsize ? window.scrollY : this.scroller.scrollTop;\n\t}\n\n\tonResize(e) {\n\t\tthis.resizeCanceler = true;\n\t}\n\n\tonTouchStart(e) {\n\t\tlet { screenX, screenY } = e.touches[0];\n\n\t\tif (this.fullsize) {\n\t\t\tthis.enableScroll();\n\t\t}\n\n\t\tthis.touchCanceler = true;\n\n\t\tif (!this.startTouchX) {\n\t\t\tthis.startTouchX = screenX;\n\t\t\tthis.startTouchY = screenY;\n\t\t\tthis.startTime = this.now();\n\t\t}\n\n\t\tthis.endTouchX = screenX;\n\t\tthis.endTouchY = screenY;\n\t\tthis.endTime = this.now();\n\t}\n\n\tonTouchMove(e) {\n\t\tlet { screenX, screenY } = e.touches[0];\n\t\tlet deltaY = Math.abs(screenY - this.endTouchY);\n\n\t\tthis.touchCanceler = true;\n\n\n\t\tif (!this.fullsize && deltaY < 10) {\n\t\t\tthis.element.scrollLeft -= screenX - this.endTouchX;\n\t\t}\n\n\t\tthis.endTouchX = screenX;\n\t\tthis.endTouchY = screenY;\n\t\tthis.endTime = this.now();\n\t}\n\n\tonTouchEnd(e) {\n\t\tif (this.fullsize) {\n\t\t\tthis.disableScroll();\n\t\t}\n\n\t\tthis.touchCanceler = false;\n\n\t\tlet swipped = this.wasSwiped();\n\n\t\tif (swipped !== 0) {\n\t\t\tthis.snap(swipped);\n\t\t} else {\n\t\t\tthis.snap();\n\t\t}\n\n\t\tthis.startTouchX = undefined;\n\t\tthis.startTouchY = undefined;\n\t\tthis.startTime = undefined;\n\t\tthis.endTouchX = undefined;\n\t\tthis.endTouchY = undefined;\n\t\tthis.endTime = undefined;\n\t}\n\n\twasSwiped() {\n\t\tlet snapWidth = this.layout.pageWidth * this.layout.divisor;\n\t\tlet distance = (this.endTouchX - this.startTouchX);\n\t\tlet absolute = Math.abs(distance);\n\t\tlet time = this.endTime - this.startTime;\n\t\tlet velocity = (distance / time);\n\t\tlet minVelocity = this.settings.minVelocity;\n\n\t\tif (absolute <= this.settings.minDistance || absolute >= snapWidth) {\n\t\t\treturn 0;\n\t\t}\n\n\t\tif (velocity > minVelocity) {\n\t\t\t// previous\n\t\t\treturn -1;\n\t\t} else if (velocity < -minVelocity) {\n\t\t\t// next\n\t\t\treturn 1;\n\t\t}\n\t}\n\n\tneedsSnap() {\n\t\tlet left = this.scrollLeft;\n\t\tlet snapWidth = this.layout.pageWidth * this.layout.divisor;\n\t\treturn (left % snapWidth) !== 0;\n\t}\n\n\tsnap(howMany=0) {\n\t\tlet left = this.scrollLeft;\n\t\tlet snapWidth = this.layout.pageWidth * this.layout.divisor;\n\t\tlet snapTo = Math.round(left / snapWidth) * snapWidth;\n\n\t\tif (howMany) {\n\t\t\tsnapTo += (howMany * snapWidth);\n\t\t}\n\n\t\treturn this.smoothScrollTo(snapTo);\n\t}\n\n\tsmoothScrollTo(destination) {\n\t\tconst deferred = new defer();\n\t\tconst start = this.scrollLeft;\n\t\tconst startTime = this.now();\n\n\t\tconst duration = this.settings.duration;\n\t\tconst easing = this.settings.easing;\n\n\t\tthis.snapping = true;\n\n\t\t// add animation loop\n\t\tfunction tick() {\n\t\t\tconst now = this.now();\n\t\t\tconst time = Math.min(1, ((now - startTime) / duration));\n\t\t\tconst timeFunction = easing(time);\n\n\n\t\t\tif (this.touchCanceler || this.resizeCanceler) {\n\t\t\t\tthis.resizeCanceler = false;\n\t\t\t\tthis.snapping = false;\n\t\t\t\tdeferred.resolve();\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif (time < 1) {\n\t\t\t\t\twindow.requestAnimationFrame(tick.bind(this));\n\t\t\t\t\tthis.scrollTo(start + ((destination - start) * time), 0);\n\t\t\t} else {\n\t\t\t\t\tthis.scrollTo(destination, 0);\n\t\t\t\t\tthis.snapping = false;\n\t\t\t\t\tdeferred.resolve();\n\t\t\t}\n\t\t}\n\n\t\ttick.call(this);\n\n\t\treturn deferred.promise;\n\t}\n\n\tscrollTo(left=0, top=0) {\n\t\tif (this.fullsize) {\n\t\t\twindow.scroll(left, top);\n\t\t} else {\n\t\t\tthis.scroller.scrollLeft = left;\n\t\t\tthis.scroller.scrollTop = top;\n\t\t}\n\t}\n\n\tnow() {\n\t\treturn ('now' in window.performance) ? performance.now() : new Date().getTime();\n\t}\n\n\tdestroy() {\n\t\tif (!this.scroller) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (this.fullsize) 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