Created
August 29, 2016 17:40
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/** | |
* Copyright Marc J. Schmidt. See the LICENSE file at the top-level | |
* directory of this distribution and at | |
* https://github.com/marcj/css-element-queries/blob/master/LICENSE. | |
*/ | |
; | |
(function (root, factory) { | |
if (typeof define === "function" && define.amd) { | |
define(factory); | |
} else if (typeof exports === "object") { | |
module.exports = factory(); | |
} else { | |
root.ResizeSensor = factory(); | |
} | |
}(this, function () { | |
// Only used for the dirty checking, so the event callback count is limted to max 1 call per fps per sensor. | |
// In combination with the event based resize sensor this saves cpu time, because the sensor is too fast and | |
// would generate too many unnecessary events. | |
var requestAnimationFrame = window.requestAnimationFrame || | |
window.mozRequestAnimationFrame || | |
window.webkitRequestAnimationFrame || | |
function (fn) { | |
return window.setTimeout(fn, 20); | |
}; | |
/** | |
* Iterate over each of the provided element(s). | |
* | |
* @param {HTMLElement|HTMLElement[]} elements | |
* @param {Function} callback | |
*/ | |
function forEachElement(elements, callback){ | |
var elementsType = Object.prototype.toString.call(elements); | |
var isCollectionTyped = ('[object Array]' === elementsType | |
|| ('[object NodeList]' === elementsType) | |
|| ('[object HTMLCollection]' === elementsType) | |
|| ('undefined' !== typeof jQuery && elements instanceof jQuery) //jquery | |
|| ('undefined' !== typeof Elements && elements instanceof Elements) //mootools | |
); | |
var i = 0, j = elements.length; | |
if (isCollectionTyped) { | |
for (; i < j; i++) { | |
callback(elements[i]); | |
} | |
} else { | |
callback(elements); | |
} | |
} | |
/** | |
* Class for dimension change detection. | |
* | |
* @param {Element|Element[]|Elements|jQuery} element | |
* @param {Function} callback | |
* | |
* @constructor | |
*/ | |
var ResizeSensor = function(element, callback) { | |
/** | |
* | |
* @constructor | |
*/ | |
function EventQueue() { | |
var q = []; | |
this.add = function(ev) { | |
q.push(ev); | |
}; | |
var i, j; | |
this.call = function() { | |
for (i = 0, j = q.length; i < j; i++) { | |
q[i].call(); | |
} | |
}; | |
this.remove = function(ev) { | |
var newQueue = []; | |
for(i = 0, j = q.length; i < j; i++) { | |
if(q[i] !== ev) newQueue.push(q[i]); | |
} | |
q = newQueue; | |
} | |
this.length = function() { | |
return q.length; | |
} | |
} | |
/** | |
* @param {HTMLElement} element | |
* @param {String} prop | |
* @returns {String|Number} | |
*/ | |
function getComputedStyle(element, prop) { | |
if (element.currentStyle) { | |
return element.currentStyle[prop]; | |
} else if (window.getComputedStyle) { | |
return window.getComputedStyle(element, null).getPropertyValue(prop); | |
} else { | |
return element.style[prop]; | |
} | |
} | |
/** | |
* | |
* @param {HTMLElement} element | |
* @param {Function} resized | |
*/ | |
function attachResizeEvent(element, resized) { | |
if (!element.resizedAttached) { | |
element.resizedAttached = new EventQueue(); | |
element.resizedAttached.add(resized); | |
} else if (element.resizedAttached) { | |
element.resizedAttached.add(resized); | |
return; | |
} | |
element.resizeSensor = document.createElement('div'); | |
element.resizeSensor.className = 'resize-sensor'; | |
var style = 'position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: hidden; z-index: -1; visibility: hidden;'; | |
var styleChild = 'position: absolute; left: 0; top: 0; transition: 0s;'; | |
element.resizeSensor.style.cssText = style; | |
element.resizeSensor.innerHTML = | |
'<div class="resize-sensor-expand" style="' + style + '">' + | |
'<div style="' + styleChild + '"></div>' + | |
'</div>' + | |
'<div class="resize-sensor-shrink" style="' + style + '">' + | |
'<div style="' + styleChild + ' width: 200%; height: 200%"></div>' + | |
'</div>'; | |
element.appendChild(element.resizeSensor); | |
if (getComputedStyle(element, 'position') == 'static') { | |
element.style.position = 'relative'; | |
} | |
var expand = element.resizeSensor.childNodes[0]; | |
var expandChild = expand.childNodes[0]; | |
var shrink = element.resizeSensor.childNodes[1]; | |
var reset = function() { | |
expandChild.style.width = 100000 + 'px'; | |
expandChild.style.height = 100000 + 'px'; | |
expand.scrollLeft = 100000; | |
expand.scrollTop = 100000; | |
shrink.scrollLeft = 100000; | |
shrink.scrollTop = 100000; | |
}; | |
reset(); | |
var dirty = false; | |
var dirtyChecking = function() { | |
if (!element.resizedAttached) return; | |
if (dirty) { | |
element.resizedAttached.call(); | |
dirty = false; | |
} | |
requestAnimationFrame(dirtyChecking); | |
}; | |
requestAnimationFrame(dirtyChecking); | |
var lastWidth, lastHeight; | |
var cachedWidth, cachedHeight; //useful to not query offsetWidth twice | |
var onScroll = function() { | |
if ((cachedWidth = element.offsetWidth) != lastWidth || (cachedHeight = element.offsetHeight) != lastHeight) { | |
dirty = true; | |
lastWidth = cachedWidth; | |
lastHeight = cachedHeight; | |
} | |
reset(); | |
}; | |
var addEvent = function(el, name, cb) { | |
if (el.attachEvent) { | |
el.attachEvent('on' + name, cb); | |
} else { | |
el.addEventListener(name, cb); | |
} | |
}; | |
addEvent(expand, 'scroll', onScroll); | |
addEvent(shrink, 'scroll', onScroll); | |
} | |
forEachElement(element, function(elem){ | |
attachResizeEvent(elem, callback); | |
}); | |
this.detach = function(ev) { | |
ResizeSensor.detach(element, ev); | |
}; | |
}; | |
ResizeSensor.detach = function(element, ev) { | |
forEachElement(element, function(elem){ | |
if(elem.resizedAttached && typeof ev == "function"){ | |
elem.resizedAttached.remove(ev); | |
if(elem.resizedAttached.length()) return; | |
} | |
if (elem.resizeSensor) { | |
if (elem.contains(elem.resizeSensor)) { | |
elem.removeChild(elem.resizeSensor); | |
} | |
delete elem.resizeSensor; | |
delete elem.resizedAttached; | |
} | |
}); | |
}; | |
return ResizeSensor; | |
})); |
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