padcom/index.html

## index.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Dropdowns</title>
  <script type="text/javascript" src="http://unpkg.com/vue"></script>
  <style>
    .label {
      cursor: pointer;
      user-select: none;
      background-color: red;
    }

    .label:hover {
      font-weight: bold;
    }

    .dropdown-content {
      display: block;
      position: absolute;
      border: solid 1px rgb(185, 185, 185);
      width: 100px;
      height: 100px;
      background-color: #eeeeee;
      box-shadow: 1px 1px 5px gray;
    }
  </style>
</head>
<body>
  <script>
    class Defocuser {
      constructor () {
        this.elements = []
        document.addEventListener('click', this.defocus('bubbling').bind(this), { capture: false })
        document.addEventListener('click', this.defocus('capture').bind(this), { capture: true })
        document.addEventListener('keydown', this.escape('bubbling').bind(this), { capture: false })
        document.addEventListener('keydown', this.escape('capture').bind(this), { capture: true })
      }

      addElement (el, phase, callback) {
        this.ensureDataStoreExistsInElement(el)
        el.__defocus.event = callback || (() => {})
        el.__defocus.observer = this.createMutationObserver(el)
        el.__defocus.phase = phase
        this.elements.unshift(el)
      }

      setSecondaryElement (el, secondary) {
        this.ensureDataStoreExistsInElement(el)
        el.__defocus.secondary = secondary
      }

      // event handlers

      defocus (phase) {
        return e => {
          if (this.elements.length === 0 || !this.elements[0].__defocus || phase !== this.elements[0].__defocus.phase) {
            return
          }

          const primary = this.elements[0]
          const secondary = primary.__defocus.secondary

          if (this.isElementOutsideElements(e.target, primary, secondary) && primary.__defocus.event) {
            primary.__defocus.event()
          }
        }
      }

      escape (phase) {
        return e => {
          if (this.elements.length === 0 || !this.elements[0].__defocus || phase !== this.elements[0].__defocus.phase) {
            return
          }
          if (e.code === 'Escape') {
            const primary = this.elements[0]
            primary.__defocus.event()
          }
        }
      }

      // private methods

      isElementOutsideElements (el, primary, secondary) {
        let element = el
        while (element) {
          if (element == primary || element == secondary) return false
          element = element.parentNode
        }
        return true
      }

      ensureDataStoreExistsInElement(el) {
        if (!el.__defocus) Object.defineProperty(el, '__defocus', { value: {} })
      }

      hasNodeRemovedEvent (el, events) {
        return events.some(event => {
          for (let i = 0; i < event.removedNodes.length; i++) {
            if (event.removedNodes[i] == el) {
              return true
            }
          }
        })
      }

      removeElementFromStack (el) {
        if (this.elements[0] != el) {
          throw new Error('Top element is not the removed one')
        }
        this.elements.shift()
      }

      createMutationObserver (el) {
        const observer = new MutationObserver(events => {
          if (this.hasNodeRemovedEvent(el, events)) {
            this.removeElementFromStack(el)
            observer.disconnect()
          }
        })
        observer.observe(el.parentNode, { childList: true })

        return observer
      }
    }

    let defocuser = null

    const defocus = {
      inserted (el, options) {
        if (!defocuser) defocuser = new Defocuser()
        defocuser.addElement(el, options.modifiers.capture ? 'capture' : 'bubbling', options.value || (() => {}))
      }
    }

    const defocusSecondary = {
      inserted (el, options) {
        if (!defocuser) defocuser = new Defocuser()
        defocuser.setSecondaryElement(el, options.value)
      }
    }

    const DefocuserLibrary = {
      defocus,
      defocusSecondary,

      install(Vue) {
        Vue.directive('defocus', defocus)
        Vue.directive('defocus-secondary', defocusSecondary)
      }
    }

    Object.defineProperties(DefocuserLibrary, {
      defocuser: {
        get: function() {
          return defocuser
        }
      }
    })

    if (typeof window !== 'undefined' && window.Vue) {
      window.Vue.use(DefocuserLibrary)
    }

    console.log(DefocuserLibrary.defocuser)
  </script>

  <div id="app">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <div class="dropdown" name="me">
      <span class="label" ref="label" @click="toggle">click me!</span>
      <div v-if="dropdown" class="dropdown-content" v-defocus.capture="close" v-defocus-secondary="$refs.label">
        Hello, world!
      </div>
    </div>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  </div>

  <script>
    new Vue({
      el: '#app',
      data: {
        dropdown: false
      },
      methods: {
        toggle () {
          this.dropdown = !this.dropdown
        },
        close () {
          this.dropdown = false
        }
      }
    })
  </script>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>Dropdowns</title>
	<script type="text/javascript" src="http://unpkg.com/vue"></script>
	<style>
	.label {
	cursor: pointer;
	user-select: none;
	background-color: red;
	}

	.label:hover {
	font-weight: bold;
	}

	.dropdown-content {
	display: block;
	position: absolute;
	border: solid 1px rgb(185, 185, 185);
	width: 100px;
	height: 100px;
	background-color: #eeeeee;
	box-shadow: 1px 1px 5px gray;
	}
	</style>
	</head>
	<body>
	<script>
	class Defocuser {
	constructor () {
	this.elements = []
	document.addEventListener('click', this.defocus('bubbling').bind(this), { capture: false })
	document.addEventListener('click', this.defocus('capture').bind(this), { capture: true })
	document.addEventListener('keydown', this.escape('bubbling').bind(this), { capture: false })
	document.addEventListener('keydown', this.escape('capture').bind(this), { capture: true })
	}

	addElement (el, phase, callback) {
	this.ensureDataStoreExistsInElement(el)
	el.__defocus.event = callback \|\| (() => {})
	el.__defocus.observer = this.createMutationObserver(el)
	el.__defocus.phase = phase
	this.elements.unshift(el)
	}

	setSecondaryElement (el, secondary) {
	this.ensureDataStoreExistsInElement(el)
	el.__defocus.secondary = secondary
	}

	// event handlers

	defocus (phase) {
	return e => {
	if (this.elements.length === 0 \|\| !this.elements[0].__defocus \|\| phase !== this.elements[0].__defocus.phase) {
	return
	}

	const primary = this.elements[0]
	const secondary = primary.__defocus.secondary

	if (this.isElementOutsideElements(e.target, primary, secondary) && primary.__defocus.event) {
	primary.__defocus.event()
	}
	}
	}

	escape (phase) {
	return e => {
	if (this.elements.length === 0 \|\| !this.elements[0].__defocus \|\| phase !== this.elements[0].__defocus.phase) {
	return
	}
	if (e.code === 'Escape') {
	const primary = this.elements[0]
	primary.__defocus.event()
	}
	}
	}

	// private methods

	isElementOutsideElements (el, primary, secondary) {
	let element = el
	while (element) {
	if (element == primary \|\| element == secondary) return false
	element = element.parentNode
	}
	return true
	}

	ensureDataStoreExistsInElement(el) {
	if (!el.__defocus) Object.defineProperty(el, '__defocus', { value: {} })
	}

	hasNodeRemovedEvent (el, events) {
	return events.some(event => {
	for (let i = 0; i < event.removedNodes.length; i++) {
	if (event.removedNodes[i] == el) {
	return true
	}
	}
	})
	}

	removeElementFromStack (el) {
	if (this.elements[0] != el) {
	throw new Error('Top element is not the removed one')
	}
	this.elements.shift()
	}

	createMutationObserver (el) {
	const observer = new MutationObserver(events => {
	if (this.hasNodeRemovedEvent(el, events)) {
	this.removeElementFromStack(el)
	observer.disconnect()
	}
	})
	observer.observe(el.parentNode, { childList: true })

	return observer
	}
	}

	let defocuser = null

	const defocus = {
	inserted (el, options) {
	if (!defocuser) defocuser = new Defocuser()
	defocuser.addElement(el, options.modifiers.capture ? 'capture' : 'bubbling', options.value \|\| (() => {}))
	}
	}

	const defocusSecondary = {
	inserted (el, options) {
	if (!defocuser) defocuser = new Defocuser()
	defocuser.setSecondaryElement(el, options.value)
	}
	}

	const DefocuserLibrary = {
	defocus,
	defocusSecondary,

	install(Vue) {
	Vue.directive('defocus', defocus)
	Vue.directive('defocus-secondary', defocusSecondary)
	}
	}

	Object.defineProperties(DefocuserLibrary, {
	defocuser: {
	get: function() {
	return defocuser
	}
	}
	})

	if (typeof window !== 'undefined' && window.Vue) {
	window.Vue.use(DefocuserLibrary)
	}

	console.log(DefocuserLibrary.defocuser)
	</script>

	<div id="app">
	<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
	<div class="dropdown" name="me">
	<span class="label" ref="label" @click="toggle">click me!</span>
	<div v-if="dropdown" class="dropdown-content" v-defocus.capture="close" v-defocus-secondary="$refs.label">
	Hello, world!
	</div>
	</div>
	<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
	</div>

	<script>
	new Vue({
	el: '#app',
	data: {
	dropdown: false
	},
	methods: {
	toggle () {
	this.dropdown = !this.dropdown
	},
	close () {
	this.dropdown = false
	}
	}
	})
	</script>
	</body>
	</html>