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ウェブページを中央配置
// ==UserScript==
// @name Page Centering
// @namespace https://greasyfork.org/users/1009-kengo321
// @version 4
// @description ウェブページを中央配置
// @grant GM_registerMenuCommand
// @grant GM_getValue
// @grant GM_setValue
// @grant GM.getValue
// @grant GM.setValue
// @match *://*/*
// @license MIT
// @noframes
// @run-at document-start
// ==/UserScript==
;(function() {
'use strict'
var createObject = function(prototype, properties) {
var descriptors = function() {
return Object.keys(properties).reduce(function(descriptors, key) {
descriptors[key] = Object.getOwnPropertyDescriptor(properties, key)
return descriptors
}, {})
}
return Object.defineProperties(Object.create(prototype), descriptors())
}
var invoke = function(methodName, args) {
return function(target) {
return target[methodName].apply(target, args)
}
}
var EventEmitter = (function() {
var EventEmitter = function() {
this._eventNameToListeners = new Map()
}
EventEmitter.prototype = {
on(eventName, listener) {
var m = this._eventNameToListeners
var v = m.get(eventName)
if (v) {
v.add(listener)
} else {
m.set(eventName, new Set([listener]))
}
return this
},
off(eventName, listener) {
var v = this._eventNameToListeners.get(eventName)
if (v) v.delete(listener)
return this
},
emit(eventName) {
var m = this._eventNameToListeners
var args = Array.from(arguments).slice(1)
for (var l of m.get(eventName) || []) l(...args)
},
}
return EventEmitter
})()
var PageCentering = (function() {
var PageCentering = function(obj) {
this.url = obj.url
this.maxWidth = obj.maxWidth
this.matched = false
}
PageCentering.prototype = {
setMatchedIfStarted(url) {
this.matched = url.startsWith(this.url)
return this
},
center(doc) {
var s = doc.documentElement.style
s.maxWidth = this.maxWidth
s.position = 'relative'
s.margin = '0px auto'
},
}
Object.assign(PageCentering, {
clear(doc) {
var s = doc.documentElement.style
s.maxWidth = ''
s.position = ''
s.margin = ''
},
MATCHED_URL_ORDER(o1, o2) {
if (o1.matched && !o2.matched) return -1
if (!o1.matched && o2.matched) return 1
if (o1.url < o2.url) return -1
if (o1.url > o2.url) return 1
return 0
},
takeLongerURL(o1, o2) {
if (o1) return o1.url.length >= o2.url.length ? o1 : o2
return o2
},
})
return PageCentering
})()
var Config = (function(_super) {
var Config = function(get, set) {
_super.call(this)
this.get = get
this.set = set
}
Config.prototype = createObject(_super.prototype, {
async _getPageCenteringObjs() {
return JSON.parse(await this.get('pageCenterings', '[]'))
},
async getPageCenterings() {
return (await this._getPageCenteringObjs()).map(function(o) {
return new PageCentering(o)
})
},
async _emitPageCenteringsChanged() {
this.emit('pageCenteringsChanged', await this.getPageCenterings())
},
async setPageCentering(pageCentering) {
var f = function(o) { return o.url !== pageCentering.url }
var newObj = {url: pageCentering.url, maxWidth: pageCentering.maxWidth}
var newObjs = (await this._getPageCenteringObjs()).filter(f).concat(newObj)
await this.set('pageCenterings', JSON.stringify(newObjs))
await this._emitPageCenteringsChanged()
},
async deletePageCentering(url) {
var f = function(o) { return o.url !== url }
var newObjs = (await this._getPageCenteringObjs()).filter(f)
await this.set('pageCenterings', JSON.stringify(newObjs))
await this._emitPageCenteringsChanged()
},
})
return Config
})(EventEmitter)
var ConfigDialog = (function(_super) {
var initUrlCell = function(urlCell, pageCentering) {
urlCell.textContent = pageCentering.url
if (pageCentering.matched) urlCell.className = 'matched'
}
var focusAndSelect = function(elem) {
elem.focus()
elem.select()
}
var ENTER_KEY = 13
var ESCAPE_KEY = 27
var invokeIf = function(key, func) {
return function(event) {
if (event.which === key) func()
}
}
var ConfigDialog = function(doc) {
_super.call(this)
this.doc = doc
this.targetURL = this._currentURL
this._addEventListeners()
focusAndSelect(this.targetUrlInput)
}
ConfigDialog.prototype = createObject(_super.prototype, {
get _currentURL() {
return this.doc.defaultView.frameElement.ownerDocument.location.href
},
_addEventListeners() {
var emitPageCenteringChangedIfValid
= this._emitPageCenteringChangedIfValid.bind(this)
;[[this.closeButton, [
['click', this._close.bind(this)],
]],
[this.changeButton, [
['click', emitPageCenteringChangedIfValid],
]],
[this.targetUrlInput, [
['keydown', invokeIf(ENTER_KEY, emitPageCenteringChangedIfValid)],
]],
[this.maxWidthInput, [
['keydown', invokeIf(ENTER_KEY, emitPageCenteringChangedIfValid)],
['input', this._updateMaxWidthInputValidity.bind(this)],
['input', this._updateChangeButtonDisabled.bind(this)],
]],
[this.doc, [
['keydown', invokeIf(ESCAPE_KEY, this._close.bind(this))],
]],
].forEach(function(a) {
a[1].forEach(function(b) {
a[0].addEventListener(b[0], b[1])
})
})
},
get targetUrlInput() {
return this.doc.getElementById('targetUrlInput')
},
get targetURL() {
return this.targetUrlInput.value
},
set targetURL(targetURL) {
this.targetUrlInput.value = targetURL
},
get maxWidthInput() {
return this.doc.getElementById('maxWidthInput')
},
get maxWidth() {
return this.maxWidthInput.value
},
set maxWidth(maxWidth) {
this.maxWidthInput.value = maxWidth
},
get closeButton() {
return this.doc.getElementById('closeButton')
},
get changeButton() {
return this.doc.getElementById('changeButton')
},
_emitPageCenteringChangedIfValid() {
if (!this._hasValidMaxWidth()) return
var o = {url: this.targetURL, maxWidth: this.maxWidth}
this.emit('pageCenteringChanged', new PageCentering(o))
},
_sort(pageCenterings) {
return pageCenterings
.map(invoke('setMatchedIfStarted', [this._currentURL]))
.sort(PageCentering.MATCHED_URL_ORDER)
},
_initDelCell(delCell, pageCentering) {
delCell.textContent = '削除'
delCell.addEventListener('click', function() {
this.emit('pageCenteringDeleted', pageCentering.url)
}.bind(this))
},
_initSettingCell(settingCell, pageCentering) {
settingCell.textContent = 'セット'
settingCell.addEventListener('click', function() {
this.targetURL = pageCentering.url
this.maxWidth = pageCentering.maxWidth
focusAndSelect(this.maxWidthInput)
this._updateMaxWidthInputValidity()
this._updateChangeButtonDisabled()
}.bind(this))
},
get dataTable() {
return this.doc.getElementById('dataTable')
},
set pageCenterings(pageCenterings) {
var t = this.dataTable
for (var r of Array.from(t.rows)) r.remove()
for (var c of this._sort(pageCenterings)) {
var tr = t.insertRow(-1)
initUrlCell(tr.insertCell(-1), c)
tr.insertCell(-1).textContent = c.maxWidth
this._initSettingCell(tr.insertCell(-1), c)
this._initDelCell(tr.insertCell(-1), c)
}
},
_close() {
this.doc.defaultView.frameElement.remove()
this.emit('closed')
},
_hasValidMaxWidth() {
var e = this.doc.createElement('div')
e.style.maxWidth = this.maxWidthInput.value
return e.style.maxWidth !== ''
},
_updateMaxWidthInputValidity() {
var MESSAGE = 'CSS の max-width プロパティに有効な値のみを設定できます。'
if (this._hasValidMaxWidth()) {
this.maxWidthInput.setCustomValidity('')
} else {
this.maxWidthInput.setCustomValidity(MESSAGE)
}
},
_updateChangeButtonDisabled() {
this.changeButton.disabled = !this._hasValidMaxWidth()
},
})
var frameLoaded = function(frame, back, config) {
var set = function(target, propName) {
return function(value) { target[propName] = value }
}
var clear = function(updateDialog) {
return function() {
back.remove()
config.off('pageCenteringsChanged', updateDialog)
}
}
return async function() {
var dialog = new ConfigDialog(frame.contentDocument)
.on('pageCenteringDeleted', config.deletePageCentering.bind(config))
.on('pageCenteringChanged', config.setPageCentering.bind(config))
dialog.pageCenterings = await config.getPageCenterings()
var updateDialog = set(dialog, 'pageCenterings')
config.on('pageCenteringsChanged', updateDialog)
dialog.on('closed', clear(updateDialog))
}
}
ConfigDialog.show = function(doc, config) {
var MAX_Z_INDEX = 2147483647
var back = doc.createElement('div')
back.style.backgroundColor = 'black'
back.style.opacity = '0.5'
back.style.zIndex = MAX_Z_INDEX - 1
back.style.position = 'fixed'
back.style.top = '0'
back.style.left = '0'
back.style.width = '100%'
back.style.height = '100%'
doc.body.appendChild(back)
var f = doc.createElement('iframe')
f.style.position = 'fixed'
f.style.top = '0'
f.style.left = '0'
f.style.width = '100%'
f.style.height = '100%'
f.style.zIndex = MAX_Z_INDEX
f.srcdoc = ConfigDialog.SRC_DOC
f.addEventListener('load', frameLoaded(f, back, config))
doc.body.appendChild(f)
}
ConfigDialog.SRC_DOC = `<!doctype html>
<html><head><style>
html {
margin: 0 auto;
max-width: 50em;
height: 100%;
line-height: 1.5em;
}
body {
height: 100%;
margin: 0;
display: flex;
flex-direction: column;
justify-content: center;
}
p {
margin: 0;
}
#dialog {
overflow: auto;
padding: 8px;
background-color: white;
}
#top {
text-align: right;
}
#targetUrlInput {
width: 100%;
}
#maxWidthInput:invalid {
color: red;
font-weight: bold;
}
#dataTable {
border-collapse: collapse;
}
#dataTable td {
border: solid thin;
padding: 0 0.5em;
line-height: 1.5em;
}
#dataTable td:nth-child(1) {
word-break: break-all;
}
#dataTable td:nth-child(2) {
text-align: right;
white-space: nowrap;
}
#dataTable td:nth-child(3),
#dataTable td:nth-child(4) {
text-decoration: underline;
cursor: pointer;
white-space: nowrap;
}
.matched {
font-weight: bold;
}
</style></head><body>
<div id=dialog>
<p id=top><input type=button value=閉じる id=closeButton></p>
<p><label for=targetUrlInput>対象URL(前方一致):</label></p>
<p><input type=url id=targetUrlInput></p>
<p><label for=maxWidthInput>最大幅:</label></p>
<p><input value=1000px id=maxWidthInput></p>
<p><input type=button value=追加／変更 id=changeButton></p>
<table id=dataTable></table>
</div>
</body></html>`
return ConfigDialog
})(EventEmitter)
function addConfigButtonIfScriptPage(config) {
if (!location.href.startsWith('https://greasyfork.org/ja/scripts/15722-page-centering'))
return
const add = () => {
const e = document.createElement('button')
e.type = 'button'
e.textContent = '設定'
e.addEventListener('click', function() {
ConfigDialog.show(document, config)
})
document.querySelector('#script-info > header > h2').appendChild(e)
}
if (['interactive', 'complete'].includes(document.readyState))
add()
else
document.addEventListener('DOMContentLoaded', add)
}
var main = async function() {
const [get, set] = typeof GM_getValue === 'undefined'
? [GM.getValue, GM.setValue]
: [GM_getValue, GM_setValue]
var config = new Config(get, set)
var updateCentering = function(pageCenterings) {
var c = pageCenterings
.map(invoke('setMatchedIfStarted', [document.location.href]))
.filter(function(c) { return c.matched })
.reduce(PageCentering.takeLongerURL, null)
if (c) c.center(document); else PageCentering.clear(document)
}
updateCentering(await config.getPageCenterings())
config.on('pageCenteringsChanged', updateCentering)
if (typeof GM_registerMenuCommand !== 'undefined') {
GM_registerMenuCommand('Page Centering 設定', function() {
ConfigDialog.show(document, config)
})
}
addConfigButtonIfScriptPage(config)
}
main()
})()