puchar/static/summernote/ResizeSensor.js

235 lines
7.5 KiB
JavaScript

/**
* 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 () {
// Make sure it does not throw in a SSR (Server Side Rendering) situation
if (typeof window === "undefined") {
return null;
}
// Only used for the dirty checking, so the event callback count is limited 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)
|| ('[object Object]' === 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) {
var computedElementStyle;
if (element.currentStyle) {
return element.currentStyle[prop];
}
if (window.getComputedStyle) {
computedElementStyle = window.getComputedStyle(element, null);
if (computedElementStyle) {
return computedElementStyle.getPropertyValue(prop);
}
}
return element.style[prop];
}
/**
*
* @param {HTMLElement} element
* @param {Function} resized
*/
function attachResizeEvent(element, resized) {
if (element.resizedAttached) {
element.resizedAttached.add(resized);
return;
}
element.resizedAttached = new EventQueue();
element.resizedAttached.add(resized);
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 dirty, rafId, newWidth, newHeight;
var lastWidth = element.offsetWidth;
var lastHeight = element.offsetHeight;
var reset = function() {
expandChild.style.width = '100000px';
expandChild.style.height = '100000px';
expand.scrollLeft = 100000;
expand.scrollTop = 100000;
shrink.scrollLeft = 100000;
shrink.scrollTop = 100000;
};
reset();
var onResized = function() {
rafId = 0;
if (!dirty) return;
lastWidth = newWidth;
lastHeight = newHeight;
if (element.resizedAttached) {
element.resizedAttached.call();
}
};
var onScroll = function() {
newWidth = element.offsetWidth;
newHeight = element.offsetHeight;
dirty = newWidth != lastWidth || newHeight != lastHeight;
if (dirty && !rafId) {
rafId = requestAnimationFrame(onResized);
}
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;
}));