distraction.party/priv/static/packs/arrow-key-navigation.js.map

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This is mostly designed\n * for KaiOS devices.\n */\n\n/* global document, addEventListener, removeEventListener, getSelection */\n// This query is adapted from a11y-dialog\n// https://github.com/edenspiekermann/a11y-dialog/blob/cf4ed81/a11y-dialog.js#L6-L18\nvar focusablesQuery = 'a[href], area[href], input, select, textarea, ' + 'button, iframe, object, embed, [contenteditable], [tabindex], ' + 'video[controls], audio[controls], summary'; // TODO: email/number types are a special type, in that they return selectionStart/selectionEnd as null\n// As far as I can tell, there is no way to actually get the caret position from these inputs. So we\n// don't do the proper caret handling for those inputs, unfortunately.\n// https://html.spec.whatwg.org/multipage/input.html#do-not-apply\n\nvar textInputTypes = ['text', 'search', 'url', 'password', 'tel'];\nvar checkboxRadioInputTypes = ['checkbox', 'radio'];\nvar focusTrapTest = undefined;\n\nfunction getFocusableElements(activeElement) {\n  // Respect focus trap inside of dialogs\n  var dialogParent = getFocusTrapParent(activeElement);\n  var root = dialogParent || document;\n  var res = [];\n  var elements = root.querySelectorAll(focusablesQuery);\n  var len = elements.length;\n\n  for (var i = 0; i < len; i++) {\n    var element = elements[i];\n\n    if (element === activeElement || !element.disabled && !/^-/.test(element.getAttribute('tabindex') || '') && !element.hasAttribute('inert') && ( // see https://github.com/GoogleChrome/inert-polyfill\n    element.offsetWidth > 0 || element.offsetHeight > 0)) {\n      res.push(element);\n    }\n  }\n\n  return res;\n}\n\nfunction getFocusTrapParent(element) {\n  if (!focusTrapTest) {\n    return;\n  }\n\n  var parent = element.parentElement;\n\n  while (parent) {\n    if (focusTrapTest(parent)) {\n      return parent;\n    }\n\n    parent = parent.parentElement;\n  }\n}\n\nfunction shouldIgnoreEvent(activeElement, key) {\n  var tagName = activeElement.tagName;\n  var isTextarea = tagName === 'TEXTAREA';\n  var isTextInput = tagName === 'INPUT' && textInputTypes.indexOf(activeElement.getAttribute('type').toLowerCase()) !== -1;\n  var isContentEditable = activeElement.hasAttribute('contenteditable');\n\n  if (!isTextarea && !isTextInput && !isContentEditable) {\n    return false;\n  }\n\n  var selectionStart;\n  var selectionEnd;\n  var len;\n\n  if (isContentEditable) {\n    var selection = getSelection();\n    selectionStart = selection.anchorOffset;\n    selectionEnd = selection.focusOffset;\n    len = activeElement.textContent.length;\n  } else {\n    selectionStart = activeElement.selectionStart;\n    selectionEnd = activeElement.selectionEnd;\n    len = activeElement.value.length;\n  } // if the cursor is inside of a textarea/input, then don't focus to the next/previous element\n  // unless the cursor is at the beginning or the end\n\n\n  if (key === 'ArrowLeft' && selectionStart === selectionEnd && selectionStart === 0) {\n    return false;\n  } else if (key === 'ArrowRight' && selectionStart === selectionEnd && selectionStart === len) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction focusNextOrPrevious(event, key) {\n  var activeElement = document.activeElement;\n\n  if (shouldIgnoreEvent(activeElement, key)) {\n    return;\n  }\n\n  var focusableElements = getFocusableElements(activeElement);\n\n  if (!focusableElements.length) {\n    return;\n  }\n\n  var index = focusableElements.indexOf(activeElement);\n  var element;\n\n  if (key === 'ArrowLeft') {\n    element = focusableElements[index - 1] || focusableElements[0];\n  } else {\n    // ArrowRight\n    element = focusableElements[index + 1] || focusableElements[focusableElements.length - 1];\n  }\n\n  element.focus();\n  event.preventDefault();\n}\n\nfunction handleEnter(event) {\n  var activeElement = document.activeElement;\n\n  if (activeElement.tagName === 'INPUT' && checkboxRadioInputTypes.indexOf(activeElement.getAttribute('type').toLowerCase()) !== -1) {\n    // Explicitly override \"enter\" on an input and make it fire the checkbox/radio\n    activeElement.click();\n    event.preventDefault();\n  }\n}\n\nfunction keyListener(event) {\n  if (event.altKey || event.metaKey || event.ctrlKey) {\n    return; // ignore e.g. Alt-Left and Ctrl-Right, which are used to switch browser tabs or navigate back/forward\n  }\n\n  var key = event.key;\n\n  switch (key) {\n    case 'ArrowLeft':\n    case 'ArrowRight':\n      {\n        focusNextOrPrevious(event, key);\n        break;\n      }\n\n    case 'Enter':\n      {\n        handleEnter(event);\n        break;\n      }\n  }\n}\n/**\n * Start listening for keyboard events. Attaches a listener to the window.\n */\n\n\nfunction register() {\n  addEventListener('keydown', keyListener);\n}\n/**\n * Stop listening for keyboard events. Unattaches a listener to the window.\n */\n\n\nfunction unregister() {\n  removeEventListener('keydown', keyListener);\n}\n/**\n * Set a focus trap test to identify any focus traps in the DOM, i.e. a top-level DOM node that indicates the root\n * of a focus trap. Once this is set, if focus changes within the focus trap, then will not leave the focus trap.\n * @param test: the test function\n * @see https://w3c.github.io/aria-practices/examples/dialog-modal/dialog.html\n */\n\n\nfunction setFocusTrapTest(test) {\n  focusTrapTest = test;\n}\n\nexport { register, setFocusTrapTest, unregister };"],"sourceRoot":""}