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Filename : resize-sensor.js
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'use strict';

/**
 * 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();
    }
}(typeof window !== 'undefined' ? window : this, function () {

    // Make sure it does not throw in a SSR (Server Side Rendering) situation
    if (typeof window === "undefined") {
        return null;
    }
    // https://github.com/Semantic-Org/Semantic-UI/issues/3855
    // https://github.com/marcj/css-element-queries/issues/257
    var globalWindow = typeof window != 'undefined' && window.Math == Math
        ? window
        : typeof self != 'undefined' && self.Math == Math
            ? self
            : Function('return this')();
    // 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 = globalWindow.requestAnimationFrame ||
        globalWindow.mozRequestAnimationFrame ||
        globalWindow.webkitRequestAnimationFrame ||
        function (fn) {
            return globalWindow.setTimeout(fn, 20);
        };

    var cancelAnimationFrame = globalWindow.cancelAnimationFrame ||
        globalWindow.mozCancelAnimationFrame ||
        globalWindow.webkitCancelAnimationFrame ||
        function (timer) {
            globalWindow.clearTimeout(timer);
        };

    /**
     * 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);
        }
    }

    /**
    * Get element size
    * @param {HTMLElement} element
    * @returns {Object} {width, height}
    */
    function getElementSize(element) {
        if (!element.getBoundingClientRect) {
            return {
                width: element.offsetWidth,
                height: element.offsetHeight
            }
        }

        var rect = element.getBoundingClientRect();
        return {
            width: Math.round(rect.width),
            height: Math.round(rect.height)
        }
    }

    /**
     * Apply CSS styles to element.
     *
     * @param {HTMLElement} element
     * @param {Object} style
     */
    function setStyle(element, style) {
        Object.keys(style).forEach(function(key) {
            element.style[key] = style[key];
        });
    }

    /**
     * Class for dimension change detection.
     *
     * @param {Element|Element[]|Elements|jQuery} element
     * @param {Function} callback
     *
     * @constructor
     */
    var ResizeSensor = function(element, callback) {
        //Is used when checking in reset() only for invisible elements
        var lastAnimationFrameForInvisibleCheck = 0;

        /**
         *
         * @constructor
         */
        function EventQueue() {
            var q = [];
            this.add = function(ev) {
                q.push(ev);
            };

            var i, j;
            this.call = function(sizeInfo) {
                for (i = 0, j = q.length; i < j; i++) {
                    q[i].call(this, sizeInfo);
                }
            };

            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 {Function}    resized
         */
        function attachResizeEvent(element, resized) {
            if (!element) return;
            if (element.resizedAttached) {
                element.resizedAttached.add(resized);
                return;
            }

            element.resizedAttached = new EventQueue();
            element.resizedAttached.add(resized);

            element.resizeSensor = document.createElement('div');
            element.resizeSensor.dir = 'ltr';
            element.resizeSensor.className = 'resize-sensor';

            var style = {
                pointerEvents: 'none',
                position: 'absolute',
                left: '0px',
                top: '0px',
                right: '0px',
                bottom: '0px',
                overflow: 'hidden',
                zIndex: '-1',
                visibility: 'hidden',
                maxWidth: '100%'
            };
            var styleChild = {
                position: 'absolute',
                left: '0px',
                top: '0px',
                transition: '0s',
            };

            setStyle(element.resizeSensor, style);

            var expand = document.createElement('div');
            expand.className = 'resize-sensor-expand';
            setStyle(expand, style);

            var expandChild = document.createElement('div');
            setStyle(expandChild, styleChild);
            expand.appendChild(expandChild);

            var shrink = document.createElement('div');
            shrink.className = 'resize-sensor-shrink';
            setStyle(shrink, style);

            var shrinkChild = document.createElement('div');
            setStyle(shrinkChild, styleChild);
            setStyle(shrinkChild, { width: '200%', height: '200%' });
            shrink.appendChild(shrinkChild);

            element.resizeSensor.appendChild(expand);
            element.resizeSensor.appendChild(shrink);
            element.appendChild(element.resizeSensor);

            var computedStyle = window.getComputedStyle(element);
            var position = computedStyle ? computedStyle.getPropertyValue('position') : null;
            if ('absolute' !== position && 'relative' !== position && 'fixed' !== position && 'sticky' !== position) {
                element.style.position = 'relative';
            }

            var dirty = false;

            //last request animation frame id used in onscroll event
            var rafId = 0;
            var size = getElementSize(element);
            var lastWidth = 0;
            var lastHeight = 0;
            var initialHiddenCheck = true;
            lastAnimationFrameForInvisibleCheck = 0;

            var resetExpandShrink = function () {
                var width = element.offsetWidth;
                var height = element.offsetHeight;

                expandChild.style.width = (width + 10) + 'px';
                expandChild.style.height = (height + 10) + 'px';

                expand.scrollLeft = width + 10;
                expand.scrollTop = height + 10;

                shrink.scrollLeft = width + 10;
                shrink.scrollTop = height + 10;
            };

            var reset = function() {
                // Check if element is hidden
                if (initialHiddenCheck) {
                    var invisible = element.offsetWidth === 0 && element.offsetHeight === 0;
                    if (invisible) {
                        // Check in next frame
                        if (!lastAnimationFrameForInvisibleCheck){
                            lastAnimationFrameForInvisibleCheck = requestAnimationFrame(function(){
                                lastAnimationFrameForInvisibleCheck = 0;
                                reset();
                            });
                        }

                        return;
                    } else {
                        // Stop checking
                        initialHiddenCheck = false;
                    }
                }

                resetExpandShrink();
            };
            element.resizeSensor.resetSensor = reset;

            var onResized = function() {
                rafId = 0;

                if (!dirty) return;

                lastWidth = size.width;
                lastHeight = size.height;

                if (element.resizedAttached) {
                    element.resizedAttached.call(size);
                }
            };

            var onScroll = function() {
                size = getElementSize(element);
                dirty = size.width !== lastWidth || size.height !== 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);

            // Fix for custom Elements and invisible elements
            lastAnimationFrameForInvisibleCheck = requestAnimationFrame(function(){
                lastAnimationFrameForInvisibleCheck = 0;
                reset();
            });
        }

        forEachElement(element, function(elem){
            attachResizeEvent(elem, callback);
        });

        this.detach = function(ev) {
            // clean up the unfinished animation frame to prevent a potential endless requestAnimationFrame of reset
            if (lastAnimationFrameForInvisibleCheck) {
                cancelAnimationFrame(lastAnimationFrameForInvisibleCheck);
                lastAnimationFrameForInvisibleCheck = 0;
            }
            ResizeSensor.detach(element, ev);
        };

        this.reset = function() {
            //To prevent invoking element.resizeSensor.resetSensor if it's undefined
            if (element.resizeSensor.resetSensor) {
                element.resizeSensor.resetSensor();
            }
        };
    };

    ResizeSensor.reset = function(element) {
        forEachElement(element, function(elem){
            //To prevent invoking element.resizeSensor.resetSensor if it's undefined
            if (element.resizeSensor.resetSensor) {
                elem.resizeSensor.resetSensor();
            }
        });
    };

    ResizeSensor.detach = function(element, ev) {
        forEachElement(element, function(elem){
            if (!elem) return;
            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;
            }
        });
    };

    if (typeof MutationObserver !== "undefined") {
        var observer = new MutationObserver(function (mutations) {
            for (var i in mutations) {
                if (mutations.hasOwnProperty(i)) {
                    var items = mutations[i].addedNodes;
                    for (var j = 0; j < items.length; j++) {
                        if (items[j].resizeSensor) {
                            ResizeSensor.reset(items[j]);
                        }
                    }
                }
            }
        });

        document.addEventListener("DOMContentLoaded", function (event) {
            observer.observe(document.body, {
                childList: true,
                subtree: true,
            });
        });
    }

    return ResizeSensor;

}));