{"version":3,"file":"embla-carousel-wheel-gestures.cjs.development.js","sources":["../src/WheelGesturesPlugin.ts"],"sourcesContent":["import { EmblaCarouselType } from 'embla-carousel'\nimport { CreateOptionsType } from 'embla-carousel/components/Options'\nimport { OptionsHandlerType } from 'embla-carousel/components/OptionsHandler'\nimport { CreatePluginType } from 'embla-carousel/components/Plugins'\nimport WheelGestures, { WheelEventState } from 'wheel-gestures'\n\nexport type WheelGesturesPluginOptions = CreateOptionsType<{\n  wheelDraggingClass: string\n  forceWheelAxis?: 'x' | 'y'\n  target?: Element\n}>\n\ntype WheelGesturesPluginType = CreatePluginType<{}, WheelGesturesPluginOptions>\n\nconst defaultOptions: WheelGesturesPluginOptions = {\n  active: true,\n  breakpoints: {},\n  wheelDraggingClass: 'is-wheel-dragging',\n  forceWheelAxis: undefined,\n  target: undefined,\n}\n\nWheelGesturesPlugin.globalOptions = undefined as WheelGesturesPluginType['options'] | undefined\n\nconst __DEV__ = process.env.NODE_ENV !== 'production'\n\nexport function WheelGesturesPlugin(userOptions: WheelGesturesPluginType['options'] = {}): WheelGesturesPluginType {\n  let options: WheelGesturesPluginOptions\n  let cleanup = () => {}\n\n  function init(embla: EmblaCarouselType, optionsHandler: OptionsHandlerType) {\n    const { mergeOptions, optionsAtMedia } = optionsHandler\n    const optionsBase = mergeOptions(defaultOptions, WheelGesturesPlugin.globalOptions)\n    const allOptions = mergeOptions(optionsBase, userOptions)\n    options = optionsAtMedia(allOptions)\n\n    const engine = embla.internalEngine()\n    const targetNode = options.target ?? (embla.containerNode().parentNode as Element)\n    const wheelAxis = options.forceWheelAxis ?? engine.options.axis\n    const wheelGestures = WheelGestures({\n      preventWheelAction: wheelAxis,\n      reverseSign: [true, true, false],\n    })\n\n    const unobserveTargetNode = wheelGestures.observe(targetNode)\n    const offWheel = wheelGestures.on('wheel', handleWheel)\n\n    let isStarted = false\n    let startEvent: MouseEvent\n\n    function wheelGestureStarted(state: WheelEventState) {\n      try {\n        startEvent = new MouseEvent('mousedown', state.event)\n        dispatchEvent(startEvent)\n      } catch (e) {\n        // Legacy Browsers like IE 10 & 11 will throw when attempting to create the Event\n        if (__DEV__) {\n          console.warn(\n            'Legacy browser requires events-polyfill (https://github.com/xiel/embla-carousel-wheel-gestures#legacy-browsers)'\n          )\n        }\n        return cleanup()\n      }\n\n      isStarted = true\n      addNativeMouseEventListeners()\n\n      if (options.wheelDraggingClass) {\n        targetNode.classList.add(options.wheelDraggingClass)\n      }\n    }\n\n    function wheelGestureEnded(state: WheelEventState) {\n      isStarted = false\n      dispatchEvent(createRelativeMouseEvent('mouseup', state))\n      removeNativeMouseEventListeners()\n\n      if (options.wheelDraggingClass) {\n        targetNode.classList.remove(options.wheelDraggingClass)\n      }\n    }\n\n    function addNativeMouseEventListeners() {\n      document.documentElement.addEventListener('mousemove', preventNativeMouseHandler, true)\n      document.documentElement.addEventListener('mouseup', preventNativeMouseHandler, true)\n      document.documentElement.addEventListener('mousedown', preventNativeMouseHandler, true)\n    }\n\n    function removeNativeMouseEventListeners() {\n      document.documentElement.removeEventListener('mousemove', preventNativeMouseHandler, true)\n      document.documentElement.removeEventListener('mouseup', preventNativeMouseHandler, true)\n      document.documentElement.removeEventListener('mousedown', preventNativeMouseHandler, true)\n    }\n\n    function preventNativeMouseHandler(e: MouseEvent) {\n      if (isStarted && e.isTrusted) {\n        e.stopImmediatePropagation()\n      }\n    }\n\n    function createRelativeMouseEvent(type: 'mousedown' | 'mousemove' | 'mouseup', state: WheelEventState) {\n      let moveX, moveY\n\n      if (wheelAxis === engine.options.axis) {\n        ;[moveX, moveY] = state.axisMovement\n      } else {\n        // if emblas axis and the wheelAxis don't match, swap the axes to match the right embla events\n        ;[moveY, moveX] = state.axisMovement\n      }\n\n      // prevent skipping slides\n      if (!engine.options.skipSnaps && !engine.options.dragFree) {\n        const maxX = engine.containerRect.width\n        const maxY = engine.containerRect.height\n\n        moveX = moveX < 0 ? Math.max(moveX, -maxX) : Math.min(moveX, maxX)\n        moveY = moveY < 0 ? Math.max(moveY, -maxY) : Math.min(moveY, maxY)\n      }\n\n      return new MouseEvent(type, {\n        clientX: startEvent.clientX + moveX,\n        clientY: startEvent.clientY + moveY,\n        screenX: startEvent.screenX + moveX,\n        screenY: startEvent.screenY + moveY,\n        movementX: moveX,\n        movementY: moveY,\n        button: 0,\n        bubbles: true,\n        cancelable: true,\n        composed: true,\n      })\n    }\n\n    function dispatchEvent(event: UIEvent) {\n      embla.containerNode().dispatchEvent(event)\n    }\n\n    function handleWheel(state: WheelEventState) {\n      const {\n        axisDelta: [deltaX, deltaY],\n      } = state\n      const primaryAxisDelta = wheelAxis === 'x' ? deltaX : deltaY\n      const crossAxisDelta = wheelAxis === 'x' ? deltaY : deltaX\n      const isRelease = state.isMomentum && state.previous && !state.previous.isMomentum\n      const isEndingOrRelease = (state.isEnding && !state.isMomentum) || isRelease\n      const primaryAxisDeltaIsDominant = Math.abs(primaryAxisDelta) > Math.abs(crossAxisDelta)\n\n      if (primaryAxisDeltaIsDominant && !isStarted && !state.isMomentum) {\n        wheelGestureStarted(state)\n      }\n\n      if (!isStarted) return\n      if (isEndingOrRelease) {\n        wheelGestureEnded(state)\n      } else {\n        dispatchEvent(createRelativeMouseEvent('mousemove', state))\n      }\n    }\n\n    cleanup = () => {\n      unobserveTargetNode()\n      offWheel()\n      removeNativeMouseEventListeners()\n    }\n  }\n\n  const self: WheelGesturesPluginType = {\n    name: 'wheelGestures',\n    options: userOptions,\n    init,\n    destroy: () => cleanup(),\n  }\n  return self\n}\n\ndeclare module 'embla-carousel' {\n  interface EmblaPluginsType {\n    wheelGestures?: WheelGesturesPluginType\n  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