iwmlib/lib/card/plugin.js

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export var CardPlugin = CardPlugin || {}
export class CardPluginBase {
apply(context) {
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this.context = context
if (this.verify(context)) {
this.append(context)
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console.log('Plugin ' + this.name + ' was verified successfully.')
return true
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} else console.error('Could not verify module ' + this.name + '.')
return false
}
get name() {
return this.constructor.name
}
verify(context) {
let funcs = this._getVerificationFunctions(context)
for (let func of funcs) {
if (!func()) return false
}
return true
}
_verifyElementsExist(context, ...selectors) {
let missing = []
for (let selector of selectors) {
let requiredElement = context.querySelector(selector)
if (requiredElement == null) {
missing.push(selector)
}
}
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const valid = missing.length == 0
if (!valid) console.error('Elements were missing: ', missing.join(', '))
return valid
}
/**
* Appends the Plugin to the context.
*
* @memberof CardPlugin
*/
append(context) {
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console.error(
'Call of abstract method CardPlugin.prototype.append(context). Plugins need to overwrite the append method!'
)
}
_getVerificationFunctions(context) {
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return [this._verifyContext.bind(this, context), this._verifyRequirements.bind(this, context)]
}
_verifyContext(context) {
if (!(context instanceof HTMLElement)) {
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console.error('Context is not of type HTML Element.', context)
return false
} else return true
}
_verifyRequirements(context) {
let requirements = this._collectAllRequirements()
let missing = []
requirements.forEach(module => {
if (context.modules.indexOf(module.name) == -1) {
missing.push(module.name)
}
})
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const valid = missing.length == 0
if (!valid)
console.error(
"Could not apply module '" +
this.name +
"'. Following modules are required but were missing: " +
missing.join(',')
)
else console.log('All requirements were met! Well done!')
return valid
}
_collectAllRequirements() {
let requirements = []
let klass = this.__proto__
while (klass) {
if (klass.require != null) {
requirements = requirements.concat(klass.require)
}
klass = klass.__proto__
}
return requirements
}
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/**
* Called when the card is removed.
* Can be used to cleanup the plugin.
*
* @memberof CardPluginBase
*/
remove() {}
}
CardPlugin.LightBox = class LightBox extends CardPluginBase {
constructor(className, style = {}) {
super()
this.className = className
this.style = style
}
append(context) {
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let wrapper = document.createElement('div')
wrapper.className = this.className
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Object.assign(
wrapper.style,
{
zIndex: 1000,
// backgroundColor: "black",
top: 0,
left: 0,
width: '100%',
height: '100%'
},
this.style,
{
display: 'none',
position: 'absolute'
}
)
context.appendChild(wrapper)
}
}
/**
* The Enlargeable Overlay module allows the user to click on the thumbnail image,
* and the images gets enlarged inside the card.
*
* @class EnlargeableThumbnail
* @extends {CardPlugin}
*/
CardPlugin.EnlargeableThumbnail = class EnlargeableThumbnail extends CardPluginBase {
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constructor(
wrapperSelector,
overlaySelector = null,
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{ zoomAnimationDuration = 0.4, fadeAnimationDuration = 0.4, interactionType = 'tap' } = {}
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) {
super()
this.wrapperSelector = wrapperSelector
this.overlaySelector = overlaySelector
this.zoomAnimationDuration = zoomAnimationDuration
this.fadeAnimationDuration = fadeAnimationDuration
this.interactionType = interactionType
}
get require() {
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return [CardPlugin.LightBox]
}
_getVerificationFunctions(context) {
let arr = super._getVerificationFunctions(context)
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let funcs = [this._verifyElementsExist.bind(this, context, this.wrapperSelector, this.overlaySelector)]
return arr.concat(funcs)
}
append(context) {
let source = this._retrieveSource(context)
this.setupEnlargeableThumbnail(context, source)
}
/**
* Get the preview image.
*
* It depends on the fact, that the thumbnail image is in the same directory
*
*
* @param {*} context
* @returns
* @memberof EnlargeableThumbnail
*/
_retrieveSource(context) {
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let img = context.querySelector(this.wrapperSelector + ' img')
let src = img.getAttribute('src')
let parts = src.split('/')
parts.pop()
parts.push(parts[parts.length - 1])
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let imagePath = parts.join('/') + '.jpg'
return imagePath
}
setupEnlargeableThumbnail(context, src) {
let wrapper = context.querySelector(this.wrapperSelector)
let overlay = context.querySelector(this.overlaySelector)
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let icon = document.createElement('div')
icon.className = 'button corner-button bottom-right icon zoom'
wrapper.appendChild(icon)
Object.assign(wrapper.style, {
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cursor: 'pointer'
})
InteractionMapper.on(this.interactionType, wrapper, () => {
this.openThumbnailDetail(context, src)
})
InteractionMapper.on(this.interactionType, overlay, () => {
this.closeThumnailDetail(context)
})
}
openThumbnailDetail(context, src) {
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let overlay = context.querySelector('.img-overlay')
overlay.innerHTML = ''
let source = context.querySelector(this.wrapperSelector)
let sourceStyle = window.getComputedStyle(source)
let imageWrapper = source.cloneNode(true)
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let image = imageWrapper.querySelector('img')
Object.assign(imageWrapper.style, {
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maxWidth: 'none',
maxHeight: 'none'
})
Object.assign(image.style, {
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width: '100%',
height: '100%',
objectFit: 'cover'
})
this._replaceIcon(imageWrapper)
image.onload = () => {
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let header = context.querySelector('header')
let headerStlye = window.getComputedStyle(header)
/**
* First the maxFillRatio is considered.
* It describes how much the image is allowed to exceed the context element.
*/
const maxFillRatio = 1.5
/**
* The minor side should not exceed the height of the context window.
*/
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const maxMinorSize =
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context.offsetHeight - 2 * parseInt(headerStlye.paddingTop) - 2 * parseInt(headerStlye.marginTop)
const max = {
width: context.offsetWidth * maxFillRatio,
height: context.offsetHeight * maxFillRatio
}
let majorSide
let minorSide
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const _width = { name: 'width', axis: 'x' }
const _height = { name: 'height', axis: 'y' }
if (image.naturalHeight > image.naturalWidth) {
majorSide = _height
minorSide = _width
} else {
majorSide = _width
minorSide = _height
}
function capitalize(string) {
return string.charAt(0).toUpperCase() + string.slice(1)
}
function getImageSize(side) {
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return image['natural' + capitalize(side.name)]
}
const majorImageSize = getImageSize(majorSide)
// const minorImageSize = getImageSize(minorSide)
let ratio = getImageSize(minorSide) / getImageSize(majorSide)
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let size = majorImageSize > max[majorSide.name] ? max[majorSide.name] : majorImageSize
if (size * ratio > maxMinorSize) {
size = maxMinorSize / ratio
}
let targetDimensions = {
width: 0,
height: 0
}
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let position = Points.fromPageToNode(context, Points.fromNodeToPage(source, { x: 0, y: 0 }))
let targetOffset = {
x: 0,
y: 0
}
targetDimensions[majorSide.name] = size
targetDimensions[minorSide.name] = size * ratio
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targetOffset[majorSide.axis] =
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(context['offset' + capitalize(majorSide.name)] - targetDimensions[majorSide.name]) / 2
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targetOffset[minorSide.axis] =
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(context['offset' + capitalize(minorSide.name)] - targetDimensions[minorSide.name]) / 2
overlay.appendChild(imageWrapper)
TweenMax.set(imageWrapper, {
left: 0,
top: 0,
x: position.x,
y: position.y,
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position: 'absolute',
width: parseInt(sourceStyle.width),
height: parseInt(sourceStyle.height)
})
TweenMax.set(overlay, {
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display: 'flex',
autoAlpha: 0
})
TweenMax.to(imageWrapper, this.zoomAnimationDuration, {
x: targetOffset.x,
y: targetOffset.y,
width: targetDimensions.width,
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height: targetDimensions.height
})
TweenMax.to(overlay, this.fadeAnimationTime, {
autoAlpha: 1
})
}
image.src = src
}
_replaceIcon(clone) {
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let zoomIcon = clone.querySelector('.icon.zoom')
zoomIcon.classList.remove('zoom')
zoomIcon.classList.add('close')
}
getBorderHeight(style) {
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const borderWidth = parseInt(style.borderTopWidth) + parseInt(style.borderBottomWidth)
const padding = parseInt(style.paddingTop) + parseInt(style.paddingBottom)
return parseInt(style.width) + borderWidth + padding
}
getBorderWidth(style) {
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const borderWidth = parseInt(style.borderLeftWidth) + parseInt(style.borderRightWidth)
const padding = parseInt(style.paddingLeft) + parseInt(style.paddingRight)
return parseInt(style.width) + borderWidth + padding
}
closeThumnailDetail(context) {
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let overlay = context.querySelector('.img-overlay')
let timeline = new TimelineLite()
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timeline
.to(overlay, this.fadeAnimationDuration, {
autoAlpha: 0
})
.set(overlay, {
display: 'none'
})
}
}
CardPlugin.Ui = class UiPlugin extends CardPluginBase {
constructor(className, parent = null) {
super()
this.parent = parent
this.className = className
}
_getVerificationFunctions(context) {
let arr = super._getVerificationFunctions(context)
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let func = [this._doesParentExist.bind(this, context, this.parent)]
return arr.concat(func)
}
_doesParentExist(context, parent) {
if (parent == null) return true
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let valid = context.querySelector(parent) != null
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if (!valid) console.error('Could not find parent on context.', context, parent)
return valid
}
append(context) {
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parent = this.parent == null ? context : context.querySelector(this.parent).appendChild(container)
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let container = document.createElement('div')
container.className = this.className
parent.appendChild(container)
}
}
CardPlugin.Speech = class SpeechPlugin extends CardPluginBase {
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constructor(parentSelector, className, interactionType = 'tap') {
super()
this.className = className
this.parentSelector = parentSelector
this.interactionType = interactionType
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// We directly overwriting the function with a version that has a binded
// reference to itself. Doing so provides an easy and reliable way to remove
// the event listener using this function. - SO
this._domWasChanged = this._domWasChanged.bind(this)
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/*
Speech doesn't stop when page is navigated.
Therefore we do it manually here.
*/
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window.addEventListener('beforeunload', () => {
window.speechSynthesis.cancel()
})
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// Binding the function beforehand ensures, that the end function is always the same.
this._end = this._end.bind(this)
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this._setupUtterance()
this.utterance.addEventListener('end', event => {
this._end()
})
}
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get require() {
return [CardPlugin.Ui]
}
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subcardChanged(closed) {
if (this.cardActive) {
this._updateText(closed)
}
}
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get cardActive() {
return this.activeUtterance == this.utterance
}
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_updateText(ignoreSubcard = false) {
let node = this.context
let subcard = node.querySelector('.mainview > .subcard')
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if (ignoreSubcard) {
if (subcard != null) {
let clone = node.cloneNode(true)
let clonedSubcard = clone.querySelector('.mainview > .subcard')
clonedSubcard.parentNode.removeChild(clonedSubcard)
node = clone
}
} else {
if (subcard) {
let clone = subcard.cloneNode(true)
clone.querySelectorAll('figure').forEach(figure => {
figure.parentNode.removeChild(figure)
})
node = clone
}
}
let id = this.context.getAttribute('data-id')
let src = this.context.getAttribute('data-source')
let subcardSource = null
if (subcard != null) {
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subcardSource = subcard.getAttribute('data-source')
}
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if (!window.speechSynthesis.speaking) {
this._start(node)
Logging.log(`Started speech on card: id:${id} - source: ${src} - subcard: ${subcardSource}`)
} else if (this.cardActive && this._sameText(node)) {
Logging.log(`Stopped speech on card: id:${id} - source: ${src} - subcard: ${subcardSource}`)
this._stop()
} else {
Logging.log(`Updated Text on card: id:${id} - source: ${src} - subcard: ${subcardSource}`)
this._stop()
.then(() => {
this._start(node)
})
.catch(console.error)
}
}
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_sameText(node) {
return this.utterance.text == this._cleanupText(node)
}
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_setupUtterance() {
this.utterance = new SpeechSynthesisUtterance()
this.utterance.lang = 'de-DE'
}
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get require() {
return [CardPlugin.Ui]
}
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remove() {
this.button = null
this.context.removeEventListener('DOMNodeRemoved', this._domWasChanged)
super.remove()
}
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append(context) {
let container = context.querySelector(this.parentSelector)
this.button = document.createElement('div')
this.button.className = 'icon button ' + this.className
container.appendChild(this.button)
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InteractionMapper.on(this.interactionType, this.button, () => {
this.speak()
})
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context.addEventListener('DOMNodeRemoved', this._domWasChanged)
}
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_domWasChanged(event) {
if (this.context == null) this._stop()
else if (
this.context['lastSpeechNode'] == window.speechSynthesis['speechPluginNode'] &&
event.target == this.context
) {
this._stop()
}
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}
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_isSameNode(node) {
return this.currentText == node.textContent
}
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speak() {
/**
* This is a little bit ugly, but imho the most elegant of all dirty solutions.
*
5ht * Within the plugins we have no knowledge of other cards and such. But must differentiate the
* clicks by their corresponding owner. The SpeechUtterance just takes a text and has no knowledge
* about the node that is currently read to the user.
*
* This means, that we can identify same text, but not differentiate same text on different nodes.
* To account for that, we add the node to the speechSynthesis object (#benefitsOfJavaScript) and
* have access to the node, by - let's say - expanding the functionality of the SpeechSynthesis object.
*
* SO -17.07.19
*/
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let activeNode = window.speechSynthesis['speechPluginNode']
this._updateText()
}
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async _stop() {
return new Promise(resolve => {
if (this.activeUtterance) {
this.activeUtterance.addEventListener('end', resolve, {
once: true
})
}
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window.speechSynthesis.cancel()
})
}
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get activeUtterance() {
return window.speechSynthesis['speechPluginUtterance']
}
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_end() {
window.speechSynthesis['speechPluginNode'] = null
window.speechSynthesis['speechPluginUtterance'] = null
this._deactivateButton()
this.context.classList.remove('speech-plugin-is-reading')
}
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_start(node) {
window.speechSynthesis.cancel()
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window.speechSynthesis['speechPluginUtterance'] = this.utterance
window.speechSynthesis['speechPluginNode'] = node
this.context['lastSpeechNode'] = node
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let cleanText = this._cleanupText(node)
this.utterance.text = cleanText
window.speechSynthesis.speak(this.utterance)
this._activateButton()
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this.context.classList.add('speech-plugin-is-reading')
}
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_cleanupText(node) {
let text = node.textContent
text = this._removeShy(text)
return text
}
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_removeShy(text) {
return text.replace(/\u00AD/g, '')
}
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_activateButton() {
if (this.button) this.button.classList.add('active')
}
_deactivateButton() {
if (this.button) this.button.classList.remove('active')
}
}