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dom.js
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dom.js
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var Util = require('../core/util');
var CustomModernizr = require('../vendor/modernizr');
/**
* Backwards compatible Media Query matcher.
* @param {String} mq Media query to match.
* @return {Boolean} Whether it matched.
*/
var testMQ = CustomModernizr.mq;
/**
* Return a function which gets the viewport width or height.
* @private
* @param {String} dimension The dimension to look up.
* @param {String} inner The inner dimension.
* @param {String} client The client dimension.
* @return {function} The getter function.
*/
function makeViewportGetter_(dimension, inner, client) {
if (testMQ('(min-' + dimension + ':' + window[inner] + 'px)')) {
return function getWindowDimension_() {
return window[inner];
};
} else {
var docElem = document.documentElement;
return function getDocumentDimension_() {
return docElem[client];
};
}
}
var getViewportWidth = makeViewportGetter_('width', 'innerWidth', 'clientWidth');
var getViewportHeight = makeViewportGetter_('height', 'innerHeight', 'clientHeight');
var detectedIE10_ = (navigator.userAgent.indexOf('MSIE 10') !== -1);
/**
* Get the document scroll.
* @param {Element} targetElement - Optional target element.
* @return {number}
*/
function documentScrollY(targetElement) {
if (targetElement && (targetElement !== window)) {
return targetElement.scrollTop;
}
if (detectedIE10_ && (window.pageYOffset != document.documentElement.scrollTop)) {
return document.documentElement.scrollTop;
}
return window.pageYOffset || document.documentElement.scrollTop;
}
/**
* Calculate the rectangle of the element with an optional buffer.
* @param {Element} elem The element.
* @param {number} buffer An extra padding.
*/
function getRect(elem) {
if (elem && !elem.nodeType) {
elem = elem[0];
}
if (!elem || 1 !== elem.nodeType) {
return false;
}
var bounds = elem.getBoundingClientRect();
return {
height: bounds.bottom - bounds.top,
width: bounds.right - bounds.left,
top: bounds.top,
left: bounds.left
};
}
var cssPrefix = Util.memoize(CustomModernizr.prefixed);
var setStyle = Util.autoCurry(function setStyle_(elem, key, value) {
elem.style[cssPrefix(key)] = value;
});
function setStyles(elem, styles) {
Util.mapObject(Util.flip(setStyle(elem)), styles);
}
function getComputedStyle(elem, key) {
var doc = (elem.nodeType == 9) ? elem : (elem.ownerDocument || elem.document);
if (doc.defaultView && doc.defaultView.getComputedStyle) {
var styles = doc.defaultView.getComputedStyle(elem, null);
if (styles) {
return styles[key] || styles.getPropertyValue(key) || '';
}
}
return '';
}
function getCascadedStyle(elem, key) {
return elem.currentStyle ? elem.currentStyle[key] : null;
}
var getStyle = Util.autoCurry(function getStyle_(elem, key) {
var prefixedKey = cssPrefix(key);
return getComputedStyle(elem, prefixedKey) ||
getCascadedStyle(elem, prefixedKey) ||
(elem.style && elem.style[prefixedKey]);
});
function insertBefore(before, elem) {
elem.parentNode.insertBefore(before, elem);
}
function detachElement(elem) {
if (elem.parentNode) {
elem.parentNode.removeChild(elem);
}
}
function inDocument_(elem) {
while (elem = elem.parentNode) {
if (elem == document) {
return true;
}
}
return false;
}
function isVisible(elem) {
if (!inDocument_(elem)) {
return false;
}
var isDisplayNone = (getStyle(elem, 'display') === 'none');
if (isDisplayNone) {
return false;
}
var parent = elem.parentNode;
if (parent) {
return isVisible(parent);
}
return true;
}
var hasClass_, addClass_, removeClass_;
function getClasses(elem) {
return elem.className.length > 0 ? elem.className.split(' ') : [];
}
if (!Util.isDefined(window.Element) || ('classList' in document.documentElement)) {
hasClass_ = function hasClassNative_(elem, className) {
return elem.classList.contains(className);
};
addClass_ = function addClassNative_(elem, className) {
elem.classList.add(className);
};
removeClass_ = function removeClassNative_(elem, className) {
elem.classList.remove(className);
};
} else {
hasClass_ = function hasClassPoly_(elem, className) {
return Util.indexOf(getClasses(elem), className) !== -1;
};
addClass_ = function addClassPoly_(elem, className) {
if (hasClass(elem)) { return; }
var currentClasses = getClasses(elem);
currentClasses.push(className);
elem.className = currentClasses.join(' ');
};
removeClass_ = function removeClassPoly_(elem, className) {
if (!hasClass(elem)) { return; }
var currentClasses = getClasses(elem);
var idx = Util.indexOf(currentClasses, className);
currentClasses.splice(idx, 1);
elem.className = currentClasses.join(' ');
};
}
var hasClass = Util.autoCurry(hasClass_);
var addClass = Util.autoCurry(addClass_);
var removeClass = Util.autoCurry(removeClass_);
var addClasses = Util.autoCurry(function addClasses_(elem, classes) {
Util.forEach(addClass(elem), classes);
});
module.exports = {
testMQ: testMQ,
getViewportWidth: getViewportWidth,
getViewportHeight: getViewportHeight,
documentScrollY: documentScrollY,
getRect: getRect,
cssPrefix: cssPrefix,
setStyle: setStyle,
setStyles: setStyles,
getStyle: getStyle,
insertBefore: insertBefore,
detachElement: detachElement,
isVisible: isVisible,
getClasses: getClasses,
hasClass: hasClass,
addClass: addClass,
removeClass: removeClass,
addClasses: addClasses
};