161 lines
3.2 KiB
JavaScript
161 lines
3.2 KiB
JavaScript
/**
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* Extend object a with the properties of object b.
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* If there's a conflict, object b takes precedence.
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*
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* @param {object} a
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* @param {object} b
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*/
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export const extend = ( a, b ) => {
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for( let i in b ) {
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a[ i ] = b[ i ];
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}
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return a;
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}
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/**
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* Converts the target object to an array.
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*
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* @param {object} o
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* @return {object[]}
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*/
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export const toArray = ( o ) => {
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return Array.prototype.slice.call( o );
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}
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/**
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* Utility for deserializing a value.
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*
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* @param {*} value
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* @return {*}
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*/
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export const deserialize = ( value ) => {
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if( typeof value === 'string' ) {
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if( value === 'null' ) return null;
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else if( value === 'true' ) return true;
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else if( value === 'false' ) return false;
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else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
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}
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return value;
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}
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/**
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* Measures the distance in pixels between point a
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* and point b.
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*
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* @param {object} a point with x/y properties
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* @param {object} b point with x/y properties
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*
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* @return {number}
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*/
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export const distanceBetween = ( a, b ) => {
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let dx = a.x - b.x,
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dy = a.y - b.y;
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return Math.sqrt( dx*dx + dy*dy );
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}
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/**
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* Applies a CSS transform to the target element.
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*
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* @param {HTMLElement} element
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* @param {string} transform
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*/
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export const transformElement = ( element, transform ) => {
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element.style.transform = transform;
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}
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/**
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* Find the closest parent that matches the given
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* selector.
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*
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* @param {HTMLElement} target The child element
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* @param {String} selector The CSS selector to match
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* the parents against
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*
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* @return {HTMLElement} The matched parent or null
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* if no matching parent was found
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*/
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export const closestParent = ( target, selector ) => {
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let parent = target.parentNode;
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while( parent ) {
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// There's some overhead doing this each time, we don't
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// want to rewrite the element prototype but should still
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// be enough to feature detect once at startup...
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let matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
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// If we find a match, we're all set
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if( matchesMethod && matchesMethod.call( parent, selector ) ) {
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return parent;
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}
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// Keep searching
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parent = parent.parentNode;
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}
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return null;
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}
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/**
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* Handling the fullscreen functionality via the fullscreen API
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*
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* @see http://fullscreen.spec.whatwg.org/
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* @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
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*/
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export const enterFullscreen = () => {
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let element = document.documentElement;
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// Check which implementation is available
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let requestMethod = element.requestFullscreen ||
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element.webkitRequestFullscreen ||
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element.webkitRequestFullScreen ||
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element.mozRequestFullScreen ||
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element.msRequestFullscreen;
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if( requestMethod ) {
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requestMethod.apply( element );
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}
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}
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/**
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* Injects the given CSS styles into the DOM.
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*
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* @param {string} value
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*/
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export const createStyleSheet = ( value ) => {
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let tag = document.createElement( 'style' );
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tag.type = 'text/css';
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if( value && value.length > 0 ) {
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if( tag.styleSheet ) {
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tag.styleSheet.cssText = value;
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}
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else {
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tag.appendChild( document.createTextNode( value ) );
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}
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}
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document.head.appendChild( tag );
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return tag;
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} |