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Filename : color-picker.js
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/**
 * @output wp-admin/js/color-picker.js
 */

( function( $, undef ) {

	var ColorPicker,
		_before = '<button type="button" class="button wp-color-result" aria-expanded="false"><span class="wp-color-result-text"></span></button>',
		_after = '<div class="wp-picker-holder" />',
		_wrap = '<div class="wp-picker-container" />',
		_button = '<input type="button" class="button button-small" />',
		_wrappingLabel = '<label></label>',
		_wrappingLabelText = '<span class="screen-reader-text"></span>',
		__ = wp.i18n.__;

	/**
	 * Creates a jQuery UI color picker that is used in the theme customizer.
	 *
	 * @class $.widget.wp.wpColorPicker
	 *
	 * @since 3.5.0
	 */
	ColorPicker = /** @lends $.widget.wp.wpColorPicker.prototype */{
		options: {
			defaultColor: false,
			change: false,
			clear: false,
			hide: true,
			palettes: true,
			width: 255,
			mode: 'hsv',
			type: 'full',
			slider: 'horizontal'
		},
		/**
		 * Creates a color picker that only allows you to adjust the hue.
		 *
		 * @since 3.5.0
		 * @access private
		 *
		 * @return {void}
		 */
		_createHueOnly: function() {
			var self = this,
				el = self.element,
				color;

			el.hide();

			// Set the saturation to the maximum level.
			color = 'hsl(' + el.val() + ', 100, 50)';

			// Create an instance of the color picker, using the hsl mode.
			el.iris( {
				mode: 'hsl',
				type: 'hue',
				hide: false,
				color: color,
				/**
				 * Handles the onChange event if one has been defined in the options.
				 *
				 * @ignore
				 *
				 * @param {Event} event    The event that's being called.
				 * @param {HTMLElement} ui The HTMLElement containing the color picker.
				 *
				 * @return {void}
				 */
				change: function( event, ui ) {
					if ( typeof self.options.change === 'function' ) {
						self.options.change.call( this, event, ui );
					}
				},
				width: self.options.width,
				slider: self.options.slider
			} );
		},
		/**
		 * Creates the color picker, sets default values, css classes and wraps it all in HTML.
		 *
		 * @since 3.5.0
		 * @access private
		 *
		 * @return {void}
		 */
		_create: function() {
			// Return early if Iris support is missing.
			if ( ! $.support.iris ) {
				return;
			}

			var self = this,
				el = self.element;

			// Override default options with options bound to the element.
			$.extend( self.options, el.data() );

			// Create a color picker which only allows adjustments to the hue.
			if ( self.options.type === 'hue' ) {
				return self._createHueOnly();
			}

			// Bind the close event.
			self.close = self.close.bind( self );

			self.initialValue = el.val();

			// Add a CSS class to the input field.
			el.addClass( 'wp-color-picker' );

			/*
			 * Check if there's already a wrapping label, e.g. in the Customizer.
			 * If there's no label, add a default one to match the Customizer template.
			 */
			if ( ! el.parent( 'label' ).length ) {
				// Wrap the input field in the default label.
				el.wrap( _wrappingLabel );
				// Insert the default label text.
				self.wrappingLabelText = $( _wrappingLabelText )
					.insertBefore( el )
					.text( __( 'Color value' ) );
			}

			/*
			 * At this point, either it's the standalone version or the Customizer
			 * one, we have a wrapping label to use as hook in the DOM, let's store it.
			 */
			self.wrappingLabel = el.parent();

			// Wrap the label in the main wrapper.
			self.wrappingLabel.wrap( _wrap );
			// Store a reference to the main wrapper.
			self.wrap = self.wrappingLabel.parent();
			// Set up the toggle button and insert it before the wrapping label.
			self.toggler = $( _before )
				.insertBefore( self.wrappingLabel )
				.css( { backgroundColor: self.initialValue } );
			// Set the toggle button span element text.
			self.toggler.find( '.wp-color-result-text' ).text( __( 'Select Color' ) );
			// Set up the Iris container and insert it after the wrapping label.
			self.pickerContainer = $( _after ).insertAfter( self.wrappingLabel );
			// Store a reference to the Clear/Default button.
			self.button = $( _button );

			// Set up the Clear/Default button.
			if ( self.options.defaultColor ) {
				self.button
					.addClass( 'wp-picker-default' )
					.val( __( 'Default' ) )
					.attr( 'aria-label', __( 'Select default color' ) );
			} else {
				self.button
					.addClass( 'wp-picker-clear' )
					.val( __( 'Clear' ) )
					.attr( 'aria-label', __( 'Clear color' ) );
			}

			// Wrap the wrapping label in its wrapper and append the Clear/Default button.
			self.wrappingLabel
				.wrap( '<span class="wp-picker-input-wrap hidden" />' )
				.after( self.button );

			/*
			 * The input wrapper now contains the label+input+Clear/Default button.
			 * Store a reference to the input wrapper: we'll use this to toggle
			 * the controls visibility.
			 */
			self.inputWrapper = el.closest( '.wp-picker-input-wrap' );

			el.iris( {
				target: self.pickerContainer,
				hide: self.options.hide,
				width: self.options.width,
				mode: self.options.mode,
				palettes: self.options.palettes,
				/**
				 * Handles the onChange event if one has been defined in the options and additionally
				 * sets the background color for the toggler element.
				 *
				 * @since 3.5.0
				 *
				 * @ignore
				 *
				 * @param {Event} event    The event that's being called.
				 * @param {HTMLElement} ui The HTMLElement containing the color picker.
				 *
				 * @return {void}
				 */
				change: function( event, ui ) {
					self.toggler.css( { backgroundColor: ui.color.toString() } );

					if ( typeof self.options.change === 'function' ) {
						self.options.change.call( this, event, ui );
					}
				}
			} );

			el.val( self.initialValue );
			self._addListeners();

			// Force the color picker to always be closed on initial load.
			if ( ! self.options.hide ) {
				self.toggler.click();
			}
		},
		/**
		 * Binds event listeners to the color picker.
		 *
		 * @since 3.5.0
		 * @access private
		 *
		 * @return {void}
		 */
		_addListeners: function() {
			var self = this;

			/**
			 * Prevent any clicks inside this widget from leaking to the top and closing it.
			 *
			 * @since 3.5.0
			 *
			 * @param {Event} event The event that's being called.
			 *
			 * @return {void}
			 */
			self.wrap.on( 'click.wpcolorpicker', function( event ) {
				event.stopPropagation();
			});

			/**
			 * Open or close the color picker depending on the class.
			 *
			 * @since 3.5.0
			 */
			self.toggler.on( 'click', function(){
				if ( self.toggler.hasClass( 'wp-picker-open' ) ) {
					self.close();
				} else {
					self.open();
				}
			});

			/**
			 * Checks if value is empty when changing the color in the color picker.
			 * If so, the background color is cleared.
			 *
			 * @since 3.5.0
			 *
			 * @param {Event} event The event that's being called.
			 *
			 * @return {void}
			 */
			self.element.on( 'change', function( event ) {
				var me = $( this ),
					val = me.val();

				if ( val === '' || val === '#' ) {
					self.toggler.css( 'backgroundColor', '' );
					// Fire clear callback if we have one.
					if ( typeof self.options.clear === 'function' ) {
						self.options.clear.call( this, event );
					}
				}
			});

			/**
			 * Enables the user to either clear the color in the color picker or revert back to the default color.
			 *
			 * @since 3.5.0
			 *
			 * @param {Event} event The event that's being called.
			 *
			 * @return {void}
			 */
			self.button.on( 'click', function( event ) {
				var me = $( this );
				if ( me.hasClass( 'wp-picker-clear' ) ) {
					self.element.val( '' );
					self.toggler.css( 'backgroundColor', '' );
					if ( typeof self.options.clear === 'function' ) {
						self.options.clear.call( this, event );
					}
				} else if ( me.hasClass( 'wp-picker-default' ) ) {
					self.element.val( self.options.defaultColor ).change();
				}
			});
		},
		/**
		 * Opens the color picker dialog.
		 *
		 * @since 3.5.0
		 *
		 * @return {void}
		 */
		open: function() {
			this.element.iris( 'toggle' );
			this.inputWrapper.removeClass( 'hidden' );
			this.wrap.addClass( 'wp-picker-active' );
			this.toggler
				.addClass( 'wp-picker-open' )
				.attr( 'aria-expanded', 'true' );
			$( 'body' ).trigger( 'click.wpcolorpicker' ).on( 'click.wpcolorpicker', this.close );
		},
		/**
		 * Closes the color picker dialog.
		 *
		 * @since 3.5.0
		 *
		 * @return {void}
		 */
		close: function() {
			this.element.iris( 'toggle' );
			this.inputWrapper.addClass( 'hidden' );
			this.wrap.removeClass( 'wp-picker-active' );
			this.toggler
				.removeClass( 'wp-picker-open' )
				.attr( 'aria-expanded', 'false' );
			$( 'body' ).off( 'click.wpcolorpicker', this.close );
		},
		/**
		 * Returns the iris object if no new color is provided. If a new color is provided, it sets the new color.
		 *
		 * @param newColor {string|*} The new color to use. Can be undefined.
		 *
		 * @since 3.5.0
		 *
		 * @return {string} The element's color.
		 */
		color: function( newColor ) {
			if ( newColor === undef ) {
				return this.element.iris( 'option', 'color' );
			}
			this.element.iris( 'option', 'color', newColor );
		},
		/**
		 * Returns the iris object if no new default color is provided.
		 * If a new default color is provided, it sets the new default color.
		 *
		 * @param newDefaultColor {string|*} The new default color to use. Can be undefined.
		 *
		 * @since 3.5.0
		 *
		 * @return {boolean|string} The element's color.
		 */
		defaultColor: function( newDefaultColor ) {
			if ( newDefaultColor === undef ) {
				return this.options.defaultColor;
			}

			this.options.defaultColor = newDefaultColor;
		}
	};

	// Register the color picker as a widget.
	$.widget( 'wp.wpColorPicker', ColorPicker );
}( jQuery ) );