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Filename : wp-color-picker-alpha.js
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/**!
 * wp-color-picker-alpha
 *
 * Overwrite Automattic Iris for enabled Alpha Channel in wpColorPicker
 * Only run in input and is defined data alpha in true
 *
 * Version: 3.0.1
 * https://github.com/kallookoo/wp-color-picker-alpha
 * Licensed under the GPLv2 license or later.
 */

(function($, undef) {

	var wpColorPickerAlpha = {
		'version': 300
	};

	// Always try to use the last version of this script.
	if ('wpColorPickerAlpha' in window && 'version' in window.wpColorPickerAlpha) {
		var version = parseInt(window.wpColorPickerAlpha.version, 10);
		if (!isNaN(version) && version >= wpColorPickerAlpha.version) {
			return;
		}
	}

	// Prevent multiple initiations
	if (Color.fn.hasOwnProperty('to_s')) {
		return;
	}

	// Create new method to replace the `Color.toString()` inside the scripts.
	Color.fn.to_s = function(type) {
		type = (type || 'hex');
		// Change hex to rgba to return the correct color.
		if ('hex' === type && this._alpha < 1) {
			type = 'rgba';
		}

		var color = '';
		if ('hex' === type) {
			color = this.toString();
		} else if (!this.error) {
			color = this.toCSS(type).replace(/\(\s+/, '(').replace(/\s+\)/, ')');
		}
		return color;
	};

	// Register the global variable.
	window.wpColorPickerAlpha = wpColorPickerAlpha;

	// Background image encoded
	var backgroundImage = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAAHnlligAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAHJJREFUeNpi+P///4EDBxiAGMgCCCAGFB5AADGCRBgYDh48CCRZIJS9vT2QBAggFBkmBiSAogxFBiCAoHogAKIKAlBUYTELAiAmEtABEECk20G6BOmuIl0CIMBQ/IEMkO0myiSSraaaBhZcbkUOs0HuBwDplz5uFJ3Z4gAAAABJRU5ErkJggg==';

	/**
	 * Iris
	 */
	$.widget('a8c.iris', $.a8c.iris, {
		/**
		 * Alpha options
		 *
		 * @since 3.0.0
		 *
		 * @type {Object}
		 */
		alphaOptions: {
			alphaEnabled: false
		},
		/**
		 * Get the current color or the new color.
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @param {Object|*} The color instance if not defined return the cuurent color.
		 *
		 * @return {string} The element's color.
		 */
		_getColor: function(color) {
			if (color === undef) {
				color = this._color;
			}

			if (this.alphaOptions.alphaEnabled) {
				color = color.to_s(this.alphaOptions.alphaColorType);
				if (!this.alphaOptions.alphaColorWithSpace) {
					color = color.replace(/\s+/g, '');
				}
				return color;
			}
			return color.toString();
		},
		/**
		 * Create widget
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_create: function() {
			try {
				// Try to get the wpColorPicker alpha options.
				this.alphaOptions = this.element.wpColorPicker('instance').alphaOptions;
			}
			catch (e) {
			}

			// We make sure there are all options
			$.extend({}, this.alphaOptions, {
				alphaEnabled       : false,
				alphaCustomWidth   : 130,
				alphaReset         : false,
				alphaColorType     : 'hex',
				alphaColorWithSpace: false
			});

			this._super();
		},
		/**
		 * Binds event listeners to the Iris.
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_addInputListeners: function(input) {
			var self            = this,
			    debounceTimeout = 100,
			    callback        = function(event) {
				    var val   = input.val(),
				        color = new Color(val),
				        val   = val.replace(/^(#|(rgb|hsl)a?)/, ''),
				        type  = self.alphaOptions.alphaColorType;

				    input.removeClass('iris-error');

				    if (!color.error) {
					    // let's not do this on keyup for hex shortcodes
					    if ('hex' !== type || !(event.type === 'keyup' && val.match(/^[0-9a-fA-F]{3}$/))) {
						    // Compare color ( #AARRGGBB )
						    if (color.toIEOctoHex() !== self._color.toIEOctoHex()) {
							    self._setOption('color', self._getColor(color));
						    }
					    }
				    } else if (val !== '') {
					    input.addClass('iris-error');
				    }
			    };

			input.on('change', callback).on('keyup', self._debounce(callback, debounceTimeout));

			// If we initialized hidden, show on first focus. The rest is up to you.
			if (self.options.hide) {
				input.one('focus', function() {
					self.show();
				});
			}
		},
		/**
		 * Init Controls
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_initControls: function() {
			this._super();

			if (this.alphaOptions.alphaEnabled) {
				// Create Alpha controls
				var self             = this,
				    stripAlpha       = self.controls.strip.clone(false, false),
				    stripAlphaSlider = stripAlpha.find('.iris-slider-offset'),
				    controls         = {
					    stripAlpha      : stripAlpha,
					    stripAlphaSlider: stripAlphaSlider
				    };

				stripAlpha.addClass('iris-strip-alpha');
				stripAlphaSlider.addClass('iris-slider-offset-alpha');
				stripAlpha.appendTo(self.picker.find('.iris-picker-inner'));

				// Push new controls
				$.each(controls, function(k, v) {
					self.controls[k] = v;
				});

				// Create slider
				self.controls.stripAlphaSlider.slider({
					orientation: 'vertical',
					min        : 0,
					max        : 100,
					step       : 1,
					value      : parseInt(self._color._alpha * 100),
					slide      : function(event, ui) {
						self.active = 'strip';
						// Update alpha value
						self._color._alpha = parseFloat(ui.value / 100);
						self._change.apply(self, arguments);
					}
				});
			}
		},
		/**
		 * Create the controls sizes
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @param {bool} reset Set to True for recreate the controls sizes.
		 *
		 * @return {void}
		 */
		_dimensions: function(reset) {
			this._super(reset);

			if (this.alphaOptions.alphaEnabled) {
				var self     = this,
				    opts     = self.options,
				    controls = self.controls,
				    square   = controls.square,
				    strip    = self.picker.find('.iris-strip'),
				    innerWidth, squareWidth, stripWidth, stripMargin, totalWidth;

				/**
				 * I use Math.round() to avoid possible size errors,
				 * this function returns the value of a number rounded
				 * to the nearest integer.
				 *
				 * The width to append all widgets,
				 * if border is enabled, 22 is subtracted.
				 * 20 for css left and right property
				 * 2 for css border
				 */
				innerWidth = Math.round(self.picker.outerWidth(true) - (opts.border ? 22 : 0));
				// The width of the draggable, aka square.
				squareWidth = Math.round(square.outerWidth());
				// The width for the sliders
				stripWidth = Math.round((innerWidth - squareWidth) / 2);
				// The margin for the sliders
				stripMargin = Math.round(stripWidth / 2);
				// The total width of the elements.
				totalWidth = Math.round(squareWidth + (stripWidth * 2) + (stripMargin * 2));

				// Check and change if necessary.
				while (totalWidth > innerWidth) {
					stripWidth = Math.round(stripWidth - 2);
					stripMargin = Math.round(stripMargin - 1);
					totalWidth = Math.round(squareWidth + (stripWidth * 2) + (stripMargin * 2));
				}

				square.css('margin', '0');
				strip.width(stripWidth).css('margin-left', stripMargin + 'px');
			}
		},
		/**
		 * Callback to update the controls and the current color.
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_change: function() {
			var self   = this,
			    active = self.active;

			self._super();

			if (self.alphaOptions.alphaEnabled) {
				var controls = self.controls,
				    alpha    = parseInt(self._color._alpha * 100),
				    color    = self._color.toRgb(),
				    gradient = [
					    'rgb(' + color.r + ',' + color.g + ',' + color.b + ') 0%',
					    'rgba(' + color.r + ',' + color.g + ',' + color.b + ', 0) 100%'
				    ],
				    target   = self.picker.closest('.wp-picker-container').find('.wp-color-result');

				self.options.color = self._getColor();
				// Generate background slider alpha, only for CSS3.
				controls.stripAlpha.css({'background': 'linear-gradient(to bottom, ' + gradient.join(', ') + '), url(' + backgroundImage + ')'});
				// Update alpha value
				if (active) {
					controls.stripAlphaSlider.slider('value', alpha);
				}

				if (!self._color.error) {
					self.element.removeClass('iris-error').val(self.options.color);
				}

				self.picker.find('.iris-palette-container').on('click.palette', '.iris-palette', function() {
					var color = $(this).data('color');
					if (self.alphaOptions.alphaReset) {
						self._color._alpha = 1;
						color = self._getColor();
					}
					self._setOption('color', color);
				});
			}
		},
		/**
		 * Paint dimensions.
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @param {string} origin  Origin (position).
		 * @param {string} control Type of the control,
		 *
		 * @return {void}
		 */
		_paintDimension: function(origin, control) {
			var self  = this,
			    color = false;

			// Fix for slider hue opacity.
			if (self.alphaOptions.alphaEnabled && 'strip' === control) {
				color = self._color;
				self._color = new Color(color.toString());
				self.hue = self._color.h();
			}

			self._super(origin, control);

			// Restore the color after paint.
			if (color) {
				self._color = color;
			}
		},
		/**
		 * To update the options, see original source to view the available options.
		 *
		 * @since 3.0.0
		 *
		 * @param {string} key   The Option name.
		 * @param {mixed} value  The Option value to update.
		 *
		 * @return {void}
		 */
		_setOption: function(key, value) {
			var self = this;
			if ('color' === key && self.alphaOptions.alphaEnabled) {
				// cast to string in case we have a number
				value = '' + value;
				newColor = new Color(value).setHSpace(self.options.mode);
				// Check if error && Check the color to prevent callbacks with the same color.
				if (!newColor.error && self._getColor(newColor) !== self._getColor()) {
					self._color = newColor;
					self.options.color = self._getColor();
					self.active = 'external';
					self._change();
				}
			} else {
				return self._super(key, value);
			}
		},
		/**
		 * 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 3.0.0
		 *
		 * @return {string} The element's color.
		 */
		color: function(newColor) {
			if (newColor === true) {
				return this._color.clone();
			}
			if (newColor === undef) {
				return this._getColor();
			}
			this.option('color', newColor);
		}
	});

	/**
	 * wpColorPicker
	 */
	$.widget('wp.wpColorPicker', $.wp.wpColorPicker, {
		/**
		 * Alpha options
		 *
		 * @since 3.0.0
		 *
		 * @type {Object}
		 */
		alphaOptions: {
			alphaEnabled: false
		},
		/**
		 * Get the alpha options.
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {object} The current alpha options.
		 */
		_getAlphaOptions: function() {
			var el      = this.element,
			    type    = (el.data('type') || this.options.type),
			    color   = (el.data('defaultColor') || el.val()),
			    options = {
				    alphaEnabled       : (el.data('alphaEnabled') || false),
				    alphaCustomWidth   : 130,
				    alphaReset         : false,
				    alphaColorType     : 'rgb',
				    alphaColorWithSpace: false
			    };

			if (options.alphaEnabled) {
				options.alphaEnabled = (el.is('input') && 'full' === type);
			}

			if (!options.alphaEnabled) {
				return options;
			}

			options.alphaColorWithSpace = (color && color.match(/\s/));

			$.each(options, function(name, defaultValue) {
				var value = (el.data(name) || defaultValue);
				switch (name) {
					case 'alphaCustomWidth':
						value = (value ? parseInt(value, 10) : 0);
						value = (isNaN(value) ? defaultValue : value);
						break;
					case 'alphaColorType':
						if (!value.match(/^(hex|(rgb|hsl)a?)$/)) {
							if (color && color.match(/^#/)) {
								value = 'hex';
							} else if (color && color.match(/^hsla?/)) {
								value = 'hsl';
							} else {
								value = defaultValue;
							}
						}
						break;
					default:
						value = !!value;
						break;
				}
				options[name] = value;
			});

			return options;
		},
		/**
		 * Create widget
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_create: function() {
			// Return early if Iris support is missing.
			if (!$.support.iris) {
				return;
			}

			// Set the alpha options for the current instance.
			this.alphaOptions = this._getAlphaOptions();

			// Create widget.
			this._super();
		},
		/**
		 * Binds event listeners to the color picker and create options, etc...
		 *
		 * @since 3.0.0
		 * @access private
		 *
		 * @return {void}
		 */
		_addListeners: function() {
			if (!this.alphaOptions.alphaEnabled) {
				return this._super();
			}

			var self         = this,
			    el           = self.element,
			    isDeprecated = self.toggler.is('a');

			this.alphaOptions.defaultWidth = el.width();
			if (this.alphaOptions.alphaCustomWidth) {
				el.width(parseInt(this.alphaOptions.defaultWidth + this.alphaOptions.alphaCustomWidth, 10));
			}

			self.toggler.css({
				'position'        : 'relative',
				'background-image': 'url(' + backgroundImage + ')'
			});

			if (isDeprecated) {
				self.toggler.html('<span class="color-alpha" />');
			} else {
				self.toggler.append('<span class="color-alpha" />');
			}

			self.colorAlpha = self.toggler.find('span.color-alpha').css({
				'width'           : '30px',
				'height'          : '100%',
				'position'        : 'absolute',
				'top'             : 0,
				'background-color': el.val()
			});

			// Define the correct position for ltr or rtl direction.
			if ('ltr' === self.colorAlpha.css('direction')) {
				self.colorAlpha.css({
					'border-bottom-left-radius': '2px',
					'border-top-left-radius'   : '2px',
					'left'                     : 0
				});
			} else {
				self.colorAlpha.css({
					'border-bottom-right-radius': '2px',
					'border-top-right-radius'   : '2px',
					'right'                     : 0
				});
			}

			el.iris({
				/**
				 * @summary Handles the onChange event if one has been defined in the options.
				 *
				 * Handles the onChange event if one has been defined in the options and additionally
				 * sets the background color for the toggler element.
				 *
				 * @since 3.0.0
				 *
				 * @param {Event} event    The event that's being called.
				 * @param {HTMLElement} ui The HTMLElement containing the color picker.
				 *
				 * @returns {void}
				 */
				change: function(event, ui) {
					self.colorAlpha.css({'background-color': ui.color.to_s(self.alphaOptions.alphaColorType)});

					// fire change callback if we have one
					if (typeof self.options.change === 'function') {
						self.options.change.call(this, event, ui);
					}
				}
			});

			/**
			 * Prevent any clicks inside this widget from leaking to the top and closing it.
			 *
			 * @since 3.0.0
			 *
			 * @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 3.0.0
			 */
			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 3.0.0
			 *
			 * @param {Event} event The event that's being called.
			 *
			 * @return {void}
			 */
			el.on( 'change', function(event) {
				var val = $(this).val();

				if (el.hasClass('iris-error') || val === '' || val.match(/^(#|(rgb|hsl)a?)$/)) {
					if (isDeprecated) {
						self.toggler.removeAttr('style');
					}

					self.colorAlpha.css('background-color', '');

					// 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 3.0.0
			 *
			 * @param {Event} event The event that's being called.
			 *
			 * @return {void}
			 */
			self.button.on('click', function(event) {
				if ($(this).hasClass('wp-picker-default')) {
					el.val(self.options.defaultColor).trigger('change');
				} else if ($(this).hasClass('wp-picker-clear')) {
					el.val('');
					if (isDeprecated) {
						self.toggler.removeAttr('style');
					}

					self.colorAlpha.css('background-color', '');

					// fire clear callback if we have one
					if (typeof self.options.clear === 'function') {
						self.options.clear.call(this, event);
					}

					el.trigger('change');
				}
			});
		}
	});
}(jQuery));