58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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/**
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* @file
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*
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* Element that improves sub-menu UX by implementing the Safe Triangle strategy.
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* @see https://www.smashingmagazine.com/2023/08/better-context-menus-safe-triangles
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*/
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((Drupal, once) => {
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/**
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* Update CSS variables values for positioning the safe triangle element.
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*
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* @param {CSSStyleDeclaration} style
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* Style property of the parent button.
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* @param {number} clientX
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* Horizontal position relative to the element.
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* @param {number} clientY
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* Vertical position relative to the element.
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*/
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function handleMouseMove({ currentTarget: { style }, clientX, clientY }) {
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style.setProperty('--safe-triangle-cursor-x', `${clientX}px`);
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style.setProperty('--safe-triangle-cursor-y', `${clientY}px`);
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}
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/**
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* Attaches the safe triangle behavior to all required triggers.
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*
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* @type {Drupal~behavior}
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*
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* @prop {Drupal~behaviorAttach} attach
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* Attaches the safe triangle behavior.
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* @prop {Drupal~behaviorDetach} detach
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* Removes the safe triangle element.
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*/
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Drupal.behaviors.safeTriangleInit = {
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attach: (context) => {
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once('safe-triangle', '[data-has-safe-triangle]', context).forEach(
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(button) => {
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button.insertAdjacentHTML(
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'beforeend',
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'<div data-safe-triangle></div>',
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);
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button.addEventListener('mousemove', handleMouseMove);
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},
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);
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},
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detach: (context, settings, trigger) => {
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if (trigger === 'unload') {
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once
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.remove('safe-triangle', '[data-has-safe-triangle]', context)
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.forEach((button) => {
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button.querySelector('[data-safe-triangle]')?.remove();
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button.removeEventListener('mousemove', handleMouseMove);
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});
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}
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},
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};
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})(Drupal, once);
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