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- /**
- * @file
- * Attaches the behaviors for the Color module.
- */
- (function ($, Drupal) {
- /**
- * Displays farbtastic color selector and initialize color administration UI.
- *
- * @type {Drupal~behavior}
- *
- * @prop {Drupal~behaviorAttach} attach
- * Attach color selection behavior to relevant context.
- */
- Drupal.behaviors.color = {
- attach(context, settings) {
- let i;
- let j;
- let colors;
- // This behavior attaches by ID, so is only valid once on a page.
- const form = $(context).find('#system-theme-settings .color-form').once('color');
- if (form.length === 0) {
- return;
- }
- const inputs = [];
- const hooks = [];
- const locks = [];
- let focused = null;
- // Add Farbtastic.
- $('<div class="color-placeholder"></div>').once('color').prependTo(form);
- const farb = $.farbtastic('.color-placeholder');
- // Decode reference colors to HSL.
- const reference = settings.color.reference;
- Object.keys(reference || {}).forEach((color) => {
- reference[color] = farb.RGBToHSL(farb.unpack(reference[color]));
- });
- // Build a preview.
- const height = [];
- const width = [];
- // Loop through all defined gradients.
- Object.keys(settings.gradients || {}).forEach((i) => {
- // Add element to display the gradient.
- $('.color-preview').once('color').append(`<div id="gradient-${i}"></div>`);
- const gradient = $(`.color-preview #gradient-${i}`);
- // Add height of current gradient to the list (divided by 10).
- height.push(parseInt(gradient.css('height'), 10) / 10);
- // Add width of current gradient to the list (divided by 10).
- width.push(parseInt(gradient.css('width'), 10) / 10);
- // Add rows (or columns for horizontal gradients).
- // Each gradient line should have a height (or width for horizontal
- // gradients) of 10px (because we divided the height/width by 10
- // above).
- for (j = 0; j < (settings.gradients[i].direction === 'vertical' ? height[i] : width[i]); ++j) {
- gradient.append('<div class="gradient-line"></div>');
- }
- });
- // Set up colorScheme selector.
- form.find('#edit-scheme').on('change', function () {
- const schemes = settings.color.schemes;
- const colorScheme = this.options[this.selectedIndex].value;
- if (colorScheme !== '' && schemes[colorScheme]) {
- // Get colors of active scheme.
- colors = schemes[colorScheme];
- Object.keys(colors || {}).forEach((fieldName) => {
- callback($(`#edit-palette-${fieldName}`), colors[fieldName], false, true);
- });
- preview();
- }
- });
- /**
- * Renders the preview.
- */
- function preview() {
- Drupal.color.callback(context, settings, form, farb, height, width);
- }
- /**
- * Shifts a given color, using a reference pair (ref in HSL).
- *
- * This algorithm ensures relative ordering on the saturation and
- * luminance axes is preserved, and performs a simple hue shift.
- *
- * It is also symmetrical. If: shiftColor(c, a, b) === d, then
- * shiftColor(d, b, a) === c.
- *
- * @function Drupal.color~shiftColor
- *
- * @param {string} given
- * A hex color code to shift.
- * @param {Array.<number>} ref1
- * First HSL color reference.
- * @param {Array.<number>} ref2
- * Second HSL color reference.
- *
- * @return {string}
- * A hex color, shifted.
- */
- function shiftColor(given, ref1, ref2) {
- let d;
- // Convert to HSL.
- given = farb.RGBToHSL(farb.unpack(given));
- // Hue: apply delta.
- given[0] += ref2[0] - ref1[0];
- // Saturation: interpolate.
- if (ref1[1] === 0 || ref2[1] === 0) {
- given[1] = ref2[1];
- }
- else {
- d = ref1[1] / ref2[1];
- if (d > 1) {
- given[1] /= d;
- }
- else {
- given[1] = 1 - ((1 - given[1]) * d);
- }
- }
- // Luminance: interpolate.
- if (ref1[2] === 0 || ref2[2] === 0) {
- given[2] = ref2[2];
- }
- else {
- d = ref1[2] / ref2[2];
- if (d > 1) {
- given[2] /= d;
- }
- else {
- given[2] = 1 - ((1 - given[2]) * d);
- }
- }
- return farb.pack(farb.HSLToRGB(given));
- }
- /**
- * Callback for Farbtastic when a new color is chosen.
- *
- * @param {HTMLElement} input
- * The input element where the color is chosen.
- * @param {string} color
- * The color that was chosen through the input.
- * @param {bool} propagate
- * Whether or not to propagate the color to a locked pair value
- * @param {bool} colorScheme
- * Flag to indicate if the user is using a color scheme when changing
- * the color.
- */
- function callback(input, color, propagate, colorScheme) {
- let matched;
- // Set background/foreground colors.
- $(input).css({
- backgroundColor: color,
- color: farb.RGBToHSL(farb.unpack(color))[2] > 0.5 ? '#000' : '#fff',
- });
- // Change input value.
- if ($(input).val() && $(input).val() !== color) {
- $(input).val(color);
- // Update locked values.
- if (propagate) {
- i = input.i;
- for (j = i + 1; ; ++j) {
- if (!locks[j - 1] || $(locks[j - 1]).is('.is-unlocked')) {
- break;
- }
- matched = shiftColor(color, reference[input.key], reference[inputs[j].key]);
- callback(inputs[j], matched, false);
- }
- for (j = i - 1; ; --j) {
- if (!locks[j] || $(locks[j]).is('.is-unlocked')) {
- break;
- }
- matched = shiftColor(color, reference[input.key], reference[inputs[j].key]);
- callback(inputs[j], matched, false);
- }
- // Update preview.
- preview();
- }
- // Reset colorScheme selector.
- if (!colorScheme) {
- resetScheme();
- }
- }
- }
- /**
- * Resets the color scheme selector.
- */
- function resetScheme() {
- form.find('#edit-scheme').each(function () {
- this.selectedIndex = this.options.length - 1;
- });
- }
- /**
- * Focuses Farbtastic on a particular field.
- *
- * @param {jQuery.Event} e
- * The focus event on the field.
- */
- function focus(e) {
- const input = e.target;
- // Remove old bindings.
- if (focused) {
- $(focused)
- .off('keyup', farb.updateValue)
- .off('keyup', preview)
- .off('keyup', resetScheme)
- .parent()
- .removeClass('item-selected');
- }
- // Add new bindings.
- focused = input;
- farb.linkTo((color) => {
- callback(input, color, true, false);
- });
- farb.setColor(input.value);
- $(focused)
- .on('keyup', farb.updateValue)
- .on('keyup', preview)
- .on('keyup', resetScheme)
- .parent()
- .addClass('item-selected');
- }
- // Initialize color fields.
- form.find('.js-color-palette input.form-text')
- .each(function () {
- // Extract palette field name.
- this.key = this.id.substring(13);
- // Link to color picker temporarily to initialize.
- farb.linkTo(() => {}).setColor('#000').linkTo(this);
- // Add lock.
- const i = inputs.length;
- if (inputs.length) {
- let toggleClick = true;
- const lock = $(`<button class="color-palette__lock">${Drupal.t('Unlock')}</button>`).on('click', function (e) {
- e.preventDefault();
- if (toggleClick) {
- $(this).addClass('is-unlocked').html(Drupal.t('Lock'));
- $(hooks[i - 1]).attr('class',
- locks[i - 2] && $(locks[i - 2]).is(':not(.is-unlocked)') ? 'color-palette__hook is-up' : 'color-palette__hook',
- );
- $(hooks[i]).attr('class',
- locks[i] && $(locks[i]).is(':not(.is-unlocked)') ? 'color-palette__hook is-down' : 'color-palette__hook',
- );
- }
- else {
- $(this).removeClass('is-unlocked').html(Drupal.t('Unlock'));
- $(hooks[i - 1]).attr('class',
- locks[i - 2] && $(locks[i - 2]).is(':not(.is-unlocked)') ? 'color-palette__hook is-both' : 'color-palette__hook is-down',
- );
- $(hooks[i]).attr('class',
- locks[i] && $(locks[i]).is(':not(.is-unlocked)') ? 'color-palette__hook is-both' : 'color-palette__hook is-up',
- );
- }
- toggleClick = !toggleClick;
- });
- $(this).after(lock);
- locks.push(lock);
- }
- // Add hook.
- const hook = $('<div class="color-palette__hook"></div>');
- $(this).after(hook);
- hooks.push(hook);
- $(this).parent().find('.color-palette__lock').trigger('click');
- this.i = i;
- inputs.push(this);
- })
- .on('focus', focus);
- form.find('.js-color-palette label');
- // Focus first color.
- inputs[0].focus();
- // Render preview.
- preview();
- },
- };
- }(jQuery, Drupal));
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