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// noinspection ES6ConvertVarToLetConst
// eslint-disable-next-line no-var, no-unused-vars
var WPFormsUtils = window.WPFormsUtils || ( function( document, window, $ ) {
/**
* Public functions and properties.
*
* @since 1.7.6
*
* @type {Object}
*/
const app = {
/**
* Wrapper to trigger a native or custom event and return the event object.
*
* @since 1.7.6
*
* @param {jQuery} $element Element to trigger event on.
* @param {string} eventName Event name to trigger (custom or native).
* @param {Array} args Trigger arguments.
*
* @return {Event} Event object.
*/
triggerEvent( $element, eventName, args = [] ) {
const eventObject = new $.Event( eventName );
$element.trigger( eventObject, args );
return eventObject;
},
/**
* Debounce.
*
* This function comes directly from underscore.js:
*
* Returns a function, that, as long as it continues to be invoked, will not
* be triggered. The function will be called after it stops being called for
* N milliseconds. If `immediate` is passed, trigger the function on the
* leading edge, instead of the trailing.
*
* Debouncing is removing unwanted input noise from buttons, switches or other user input.
* Debouncing prevents extra activations or slow functions from triggering too often.
*
* @param {Function} func The function to be debounced.
* @param {number} wait The amount of time to delay calling func.
* @param {boolean} immediate Whether or not to trigger the function on the leading edge.
*
* @return {Function} Returns a function that, as long as it continues to be invoked, will not be triggered.
*/
debounce( func, wait, immediate ) {
let timeout;
return function() {
const context = this,
args = arguments;
const later = function() {
timeout = null;
if ( ! immediate ) {
func.apply( context, args );
}
};
const callNow = immediate && ! timeout;
clearTimeout( timeout );
timeout = setTimeout( later, wait );
if ( callNow ) {
func.apply( context, args );
}
};
},
/**
* CSS color operations.
*
* @since 1.8.8
*
* @type {Object}
*/
cssColorsUtils: {
/**
* Checks if the provided color has transparency.
*
* @since 1.8.8
*
* @param {string} color The color to check.
* @param {number} opacityThreshold The max opacity value of the color that is considered as transparent.
*
* @return {boolean} Returns true if the color is transparent.
*/
isTransparentColor( color, opacityThreshold = 0.33 ) {
const rgba = app.cssColorsUtils.getColorAsRGBArray( color );
const opacity = Number( rgba?.[ 3 ] );
// Compare the opacity value with the threshold.
return opacity <= opacityThreshold;
},
/**
* Get color as an array of RGB(A) values.
*
* @since 1.8.8
*
* @param {string} color Color.
*
* @return {Array|boolean} Color as an array of RGBA values. False on error.
*/
getColorAsRGBArray( color ) {
// Check if the given color is a valid CSS color.
if ( ! app.cssColorsUtils.isValidColor( color ) ) {
return false;
}
// Remove # from the beginning of the string and remove whitespaces.
color = color.replace( /^#/, '' ).replaceAll( ' ', '' );
color = color === 'transparent' ? 'rgba(0,0,0,0)' : color;
const rgba = color;
let rgbArray;
// Check if color is in HEX(A) format.
const isHex = rgba.match( /[0-9a-f]{6,8}$/ig );
if ( isHex ) {
// Search and split HEX(A) color into an array of couples of chars.
rgbArray = rgba.match( /\w\w/g ).map( ( x ) => parseInt( x, 16 ) );
rgbArray[ 3 ] = rgbArray[ 3 ] || rgbArray[ 3 ] === 0 ? ( rgbArray[ 3 ] / 255 ).toFixed( 2 ) : 1;
} else {
rgbArray = rgba.split( '(' )[ 1 ].split( ')' )[ 0 ].split( ',' );
}
return rgbArray;
},
/**
* Check if the given color is a valid CSS color.
*
* @since 1.8.8
*
* @param {string} color Color.
*
* @return {boolean} True if the given color is a valid CSS color.
*/
isValidColor( color ) {
// Create a temporary DOM element and use `style` property.
const s = new Option().style;
s.color = color;
// Invalid color leads to the empty color property of DOM element style.
return s.color !== '';
},
/**
* Get contrast color relative to given color.
*
* @since 1.8.8
*
* @param {string} color Color.
*
* @return {string} True if the given color is a valid CSS color.
*/
getContrastColor( color ) {
const rgba = app.cssColorsUtils.getColorAsRGBArray( color );
const sum = rgba.reduce( ( a, b ) => a + b, 0 );
const avg = Math.round( ( sum / 3 ) * ( rgba[ 3 ] ?? 1 ) );
return avg < 128 ? '#ffffff' : '#000000';
},
/**
* Add opacity to color string.
* Supports formats: RGB, RGBA, HEX, HEXA.
*
* If the given color has an alpha channel, the new alpha channel will be calculated according to the given opacity.
*
* @since 1.8.9
*
* @param {string} color Color.
* @param {string} opacity Opacity.
*
* @return {string} Color in RGBA format with an added alpha channel according to given opacity.
*/
getColorWithOpacity( color, opacity ) {
color = color.trim();
const rgbArray = app.cssColorsUtils.getColorAsRGBArray( color );
if ( ! rgbArray ) {
return color;
}
// Default opacity is 1.
opacity = ! opacity || opacity.length === 0 ? '1' : opacity.toString();
const alpha = rgbArray.length === 4 ? parseFloat( rgbArray[ 3 ] ) : 1;
// Calculate new alpha value.
const newAlpha = parseFloat( opacity ) * alpha;
// Combine and return the RGBA color.
return `rgba(${ rgbArray[ 0 ] },${ rgbArray[ 1 ] },${ rgbArray[ 2 ] },${ newAlpha })`.replace( /\s+/g, '' );
},
},
};
// Provide access to public functions/properties.
return app;
}( document, window, jQuery ) );