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Editing: customizer-controls.js

jQuery( document ).ready(function($) {

/**
 	 * Alpha Color Picker Custom Control
 	 *
 	 * @author Braad Martin <http://braadmartin.com>
 	 * @license http://www.gnu.org/licenses/gpl-3.0.html
 	 * @link https://github.com/BraadMartin/components/tree/master/customizer/alpha-color-picker
 	 */

// Loop over each control and transform it into our color picker.
	$( '.alpha-color-control' ).each( function() {

// Scope the vars.
		var $control, startingColor, paletteInput, showOpacity, defaultColor, palette,
			colorPickerOptions, $container, $alphaSlider, alphaVal, sliderOptions;

// Store the control instance.
		$control = $( this );

// Get a clean starting value for the option.
		startingColor = $control.val().replace( /\s+/g, '' );

// Get some data off the control.
		paletteInput = $control.attr( 'data-palette' );
		showOpacity  = $control.attr( 'data-show-opacity' );
		defaultColor = $control.attr( 'data-default-color' );

// Process the palette.
		if ( paletteInput.indexOf( '|' ) !== -1 ) {
			palette = paletteInput.split( '|' );
		} else if ( 'false' == paletteInput ) {
			palette = false;
		} else {
			palette = true;
		}

// Set up the options that we'll pass to wpColorPicker().
		colorPickerOptions = {
			change: function( event, ui ) {
				var key, value, alpha, $transparency;

key = $control.attr( 'data-customize-setting-link' );
				value = $control.wpColorPicker( 'color' );

// Set the opacity value on the slider handle when the default color button is clicked.
				if ( defaultColor == value ) {
					alpha = pfx_acp_get_alpha_value_from_color( value );
					$alphaSlider.find( '.ui-slider-handle' ).text( alpha );
				}

// Send ajax request to wp.customize to trigger the Save action.
				wp.customize( key, function( obj ) {
					obj.set( value );
				});

$transparency = $container.find( '.transparency' );

// Always show the background color of the opacity slider at 100% opacity.
				$transparency.css( 'background-color', ui.color.toString( 'no-alpha' ) );
			},
			palettes: palette // Use the passed in palette.
		};

// Create the colorpicker.
		$control.wpColorPicker( colorPickerOptions );

$container = $control.parents( '.wp-picker-container:first' );

// Insert our opacity slider.
		$( '<div class="alpha-color-picker-container">' +
				'<div class="min-click-zone click-zone"></div>' +
				'<div class="max-click-zone click-zone"></div>' +
				'<div class="alpha-slider"></div>' +
				'<div class="transparency"></div>' +
			'</div>' ).appendTo( $container.find( '.wp-picker-holder' ) );

$alphaSlider = $container.find( '.alpha-slider' );

// If starting value is in format RGBa, grab the alpha channel.
		alphaVal = pfx_acp_get_alpha_value_from_color( startingColor );

// Set up jQuery UI slider() options.
		sliderOptions = {
			create: function( event, ui ) {
				var value = $( this ).slider( 'value' );

// Set up initial values.
				$( this ).find( '.ui-slider-handle' ).text( value );
				$( this ).siblings( '.transparency ').css( 'background-color', startingColor );
			},
			value: alphaVal,
			range: 'max',
			step: 1,
			min: 0,
			max: 100,
			animate: 300
		};

// Initialize jQuery UI slider with our options.
		$alphaSlider.slider( sliderOptions );

// Maybe show the opacity on the handle.
		if ( 'true' == showOpacity ) {
			$alphaSlider.find( '.ui-slider-handle' ).addClass( 'show-opacity' );
		}

// Bind event handlers for the click zones.
		$container.find( '.min-click-zone' ).on( 'click', function() {
			pfx_acp_update_alpha_value_on_color_control( 0, $control, $alphaSlider, true );
		});
		$container.find( '.max-click-zone' ).on( 'click', function() {
			pfx_acp_update_alpha_value_on_color_control( 100, $control, $alphaSlider, true );
		});

// Bind event handler for clicking on a palette color.
		$container.find( '.iris-palette' ).on( 'click', function() {
			var color, alpha;

color = $( this ).css( 'background-color' );
			alpha = pfx_acp_get_alpha_value_from_color( color );

pfx_acp_update_alpha_value_on_alpha_slider( alpha, $alphaSlider );

// Sometimes Iris doesn't set a perfect background-color on the palette,
			// for example rgba(20, 80, 100, 0.3) becomes rgba(20, 80, 100, 0.298039).
			// To compensante for this we round the opacity value on RGBa colors here
			// and save it a second time to the color picker object.
			if ( alpha != 100 ) {
				color = color.replace( /[^,]+(?=\))/, ( alpha / 100 ).toFixed( 2 ) );
			}

$control.wpColorPicker( 'color', color );
		});

// Bind event handler for clicking on the 'Clear' button.
		$container.find( '.button.wp-picker-clear' ).on( 'click', function() {
			var key = $control.attr( 'data-customize-setting-link' );

// The #fff color is delibrate here. This sets the color picker to white instead of the
			// defult black, which puts the color picker in a better place to visually represent empty.
			$control.wpColorPicker( 'color', '#ffffff' );

// Set the actual option value to empty string.
			wp.customize( key, function( obj ) {
				obj.set( '' );
			});

pfx_acp_update_alpha_value_on_alpha_slider( 100, $alphaSlider );
		});

// Bind event handler for clicking on the 'Default' button.
		$container.find( '.button.wp-picker-default' ).on( 'click', function() {
			var alpha = pfx_acp_get_alpha_value_from_color( defaultColor );

pfx_acp_update_alpha_value_on_alpha_slider( alpha, $alphaSlider );
		});

// Bind event handler for typing or pasting into the input.
		$control.on( 'input', function() {
			var value = $( this ).val();
			var alpha = pfx_acp_get_alpha_value_from_color( value );

pfx_acp_update_alpha_value_on_alpha_slider( alpha, $alphaSlider );
		});

// Update all the things when the slider is interacted with.
		$alphaSlider.slider().on( 'slide', function( event, ui ) {
			var alpha = parseFloat( ui.value ) / 100.0;

pfx_acp_update_alpha_value_on_color_control( alpha, $control, $alphaSlider, false );

// Change value shown on slider handle.
			$( this ).find( '.ui-slider-handle' ).text( ui.value );
		});

});
  
});

/**
 * Override the stock color.js toString() method to add support for outputting RGBa or Hex.
 */
Color.prototype.toString = function( flag ) {

// If our no-alpha flag has been passed in, output RGBa value with 100% opacity.
	// This is used to set the background color on the opacity slider during color changes.
	if ( 'no-alpha' == flag ) {
		return this.toCSS( 'rgba', '1' ).replace( /\s+/g, '' );
	}

// If we have a proper opacity value, output RGBa.
	if ( 1 > this._alpha ) {
		return this.toCSS( 'rgba', this._alpha ).replace( /\s+/g, '' );
	}

// Proceed with stock color.js hex output.
	var hex = parseInt( this._color, 10 ).toString( 16 );
	if ( this.error ) { return ''; }
	if ( hex.length < 6 ) {
		for ( var i = 6 - hex.length - 1; i >= 0; i-- ) {
			hex = '0' + hex;
		}
	}

return '#' + hex;
};

/**
 * Given an RGBa, RGB, or hex color value, return the alpha channel value.
 */
function pfx_acp_get_alpha_value_from_color( value ) {
	var alphaVal;

// Remove all spaces from the passed in value to help our RGBa regex.
	value = value.replace( / /g, '' );

if ( value.match( /rgba$\d+\,\d+\,\d+\,([^$]+)\)/ ) ) {
		alphaVal = parseFloat( value.match( /rgba$\d+\,\d+\,\d+\,([^$]+)\)/ )[1] ).toFixed(2) * 100;
		alphaVal = parseInt( alphaVal );
	} else {
		alphaVal = 100;
	}

return alphaVal;
}

/**
 * Force update the alpha value of the color picker object and maybe the alpha slider.
 */
 function pfx_acp_update_alpha_value_on_color_control( alpha, $control, $alphaSlider, update_slider ) {
	var iris, colorPicker, color;

iris = $control.data( 'a8cIris' );
	colorPicker = $control.data( 'wpWpColorPicker' );

// Set the alpha value on the Iris object.
	iris._color._alpha = alpha;

// Store the new color value.
	color = iris._color.toString();

// Set the value of the input.
	$control.val( color );

// Update the background color of the color picker.
	colorPicker.toggler.css({
		'background-color': color
	});

// Maybe update the alpha slider itself.
	if ( update_slider ) {
		pfx_acp_update_alpha_value_on_alpha_slider( alpha, $alphaSlider );
	}

// Update the color value of the color picker object.
	$control.wpColorPicker( 'color', color );
}

/**
 * Update the slider handle position and label.
 */
function pfx_acp_update_alpha_value_on_alpha_slider( alpha, $alphaSlider ) {
	$alphaSlider.slider( 'value', alpha );
	$alphaSlider.find( '.ui-slider-handle' ).text( alpha.toString() );
}