Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1571 insertions, 0 deletions

diff --git a/toolkit/content/widgets/datetimebox.js b/toolkit/content/widgets/datetimebox.js
new file mode 100644
index 0000000000..926ba2cf8e
--- /dev/null
+++ b/toolkit/content/widgets/datetimebox.js
@@ -0,0 +1,1571 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// This is a UA widget. It runs in per-origin UA widget scope,
+// to be loaded by UAWidgetsChild.jsm.
+
+/*
+ * This is the class of entry. It will construct the actual implementation
+ * according to the value of the "type" property.
+ */
+this.DateTimeBoxWidget = class {
+  constructor(shadowRoot) {
+    this.shadowRoot = shadowRoot;
+    this.element = shadowRoot.host;
+    this.document = this.element.ownerDocument;
+    this.window = this.document.defaultView;
+    // The DOMLocalization instance needs to allow for sync methods so that
+    // the placeholder value may be determined and set during the
+    // createEditFieldAndAppend() call.
+    this.l10n = new this.window.DOMLocalization(
+      ["toolkit/global/datetimebox.ftl"],
+      /* aSync = */ true
+    );
+  }
+
+  /*
+   * Callback called by UAWidgets right after constructor.
+   */
+  onsetup() {
+    this.onchange(/* aDestroy = */ false);
+  }
+
+  /*
+   * Callback called by UAWidgets when the "type" property changes.
+   */
+  onchange(aDestroy = true) {
+    let newType = this.element.type;
+    if (this.type == newType) {
+      return;
+    }
+
+    if (aDestroy) {
+      this.teardown();
+    }
+    this.type = newType;
+    this.setup();
+  }
+
+  shouldShowTime() {
+    return this.type == "time" || this.type == "datetime-local";
+  }
+
+  shouldShowDate() {
+    return this.type == "date" || this.type == "datetime-local";
+  }
+
+  teardown() {
+    this.mInputElement.removeEventListener("keydown", this, {
+      capture: true,
+      mozSystemGroup: true,
+    });
+    this.mInputElement.removeEventListener("click", this, {
+      mozSystemGroup: true,
+    });
+
+    this.CONTROL_EVENTS.forEach(eventName => {
+      this.mDateTimeBoxElement.removeEventListener(eventName, this);
+    });
+
+    this.l10n.disconnectRoot(this.shadowRoot);
+
+    this.removeEditFields();
+    this.removeEventListenersToField(this.mCalendarButton);
+
+    this.mInputElement = null;
+
+    this.shadowRoot.firstChild.remove();
+  }
+
+  removeEditFields() {
+    this.removeEventListenersToField(this.mYearField);
+    this.removeEventListenersToField(this.mMonthField);
+    this.removeEventListenersToField(this.mDayField);
+    this.removeEventListenersToField(this.mHourField);
+    this.removeEventListenersToField(this.mMinuteField);
+    this.removeEventListenersToField(this.mSecondField);
+    this.removeEventListenersToField(this.mMillisecField);
+    this.removeEventListenersToField(this.mDayPeriodField);
+
+    this.mYearField = null;
+    this.mMonthField = null;
+    this.mDayField = null;
+    this.mHourField = null;
+    this.mMinuteField = null;
+    this.mSecondField = null;
+    this.mMillisecField = null;
+    this.mDayPeriodField = null;
+
+    let root = this.shadowRoot.getElementById("edit-wrapper");
+    while (root.firstChild) {
+      root.firstChild.remove();
+    }
+  }
+
+  rebuildEditFieldsIfNeeded() {
+    if (
+      this.shouldShowSecondField() == !!this.mSecondField &&
+      this.shouldShowMillisecField() == !!this.mMillisecField
+    ) {
+      return;
+    }
+
+    let focused = this.mInputElement.matches(":focus");
+
+    this.removeEditFields();
+    this.buildEditFields();
+
+    if (focused) {
+      this._focusFirstField();
+    }
+  }
+
+  _focusFirstField() {
+    this.shadowRoot.querySelector(".datetime-edit-field")?.focus();
+  }
+
+  setup() {
+    this.DEBUG = false;
+
+    this.l10n.connectRoot(this.shadowRoot);
+
+    this.generateContent();
+
+    this.mDateTimeBoxElement = this.shadowRoot.firstChild;
+    this.mCalendarButton = this.shadowRoot.getElementById("calendar-button");
+    this.mInputElement = this.element;
+    this.mLocales = this.window.getWebExposedLocales();
+
+    this.mIsRTL = false;
+    let intlUtils = this.window.intlUtils;
+    if (intlUtils) {
+      this.mIsRTL = intlUtils.isAppLocaleRTL();
+    }
+
+    if (this.mIsRTL) {
+      let inputBoxWrapper = this.shadowRoot.getElementById("input-box-wrapper");
+      inputBoxWrapper.dir = "rtl";
+    }
+
+    this.mIsPickerOpen = false;
+
+    this.mMinMonth = 1;
+    this.mMaxMonth = 12;
+    this.mMinDay = 1;
+    this.mMaxDay = 31;
+    this.mMinYear = 1;
+    // Maximum year limited by ECMAScript date object range, year <= 275760.
+    this.mMaxYear = 275760;
+    this.mMonthDayLength = 2;
+    this.mYearLength = 4;
+    this.mMonthPageUpDownInterval = 3;
+    this.mDayPageUpDownInterval = 7;
+    this.mYearPageUpDownInterval = 10;
+
+    const kDefaultAMString = "AM";
+    const kDefaultPMString = "PM";
+
+    let { amString, pmString } = this.getStringsForLocale(this.mLocales);
+
+    this.mAMIndicator = amString || kDefaultAMString;
+    this.mPMIndicator = pmString || kDefaultPMString;
+
+    this.mHour12 = this.is12HourTime(this.mLocales);
+    this.mMillisecSeparatorText = ".";
+    this.mMaxLength = 2;
+    this.mMillisecMaxLength = 3;
+    this.mDefaultStep = 60 * 1000; // in milliseconds
+
+    this.mMinHour = this.mHour12 ? 1 : 0;
+    this.mMaxHour = this.mHour12 ? 12 : 23;
+    this.mMinMinute = 0;
+    this.mMaxMinute = 59;
+    this.mMinSecond = 0;
+    this.mMaxSecond = 59;
+    this.mMinMillisecond = 0;
+    this.mMaxMillisecond = 999;
+
+    this.mHourPageUpDownInterval = 3;
+    this.mMinSecPageUpDownInterval = 10;
+
+    this.mInputElement.addEventListener(
+      "keydown",
+      this,
+      {
+        capture: true,
+        mozSystemGroup: true,
+      },
+      false
+    );
+    // This is to open the picker when input element is tapped on Android
+    // or for type=time inputs (this includes padding area).
+    this.isAndroid = this.window.navigator.appVersion.includes("Android");
+    if (this.isAndroid || this.type == "time") {
+      this.mInputElement.addEventListener(
+        "click",
+        this,
+        { mozSystemGroup: true },
+        false
+      );
+    }
+
+    // Those events are dispatched to <div class="datetimebox"> with bubble set
+    // to false. They are trapped inside UA Widget Shadow DOM and are not
+    // dispatched to the document.
+    this.CONTROL_EVENTS.forEach(eventName => {
+      this.mDateTimeBoxElement.addEventListener(eventName, this, {}, false);
+    });
+
+    this.buildEditFields();
+    this.buildCalendarBtn();
+    this.updateEditAttributes();
+
+    if (this.mInputElement.value) {
+      this.setFieldsFromInputValue();
+    }
+
+    if (this.mInputElement.matches(":focus")) {
+      this._focusFirstField();
+    }
+  }
+
+  generateContent() {
+    const parser = new this.window.DOMParser();
+    let parserDoc = parser.parseFromString(
+      `<div class="datetimebox" xmlns="http://www.w3.org/1999/xhtml" role="none">
+        <link rel="stylesheet" type="text/css" href="chrome://global/content/bindings/datetimebox.css" />
+        <div class="datetime-input-box-wrapper" id="input-box-wrapper" role="presentation">
+          <span class="datetime-input-edit-wrapper"
+                     id="edit-wrapper">
+            <!-- Each of the date/time input types will append their input child
+               - elements here -->
+          </span>
+          <button data-l10n-id="datetime-calendar" class="datetime-calendar-button" id="calendar-button" aria-expanded="false">
+            <svg role="none" class="datetime-calendar-button-svg" xmlns="http://www.w3.org/2000/svg" id="calendar-16" viewBox="0 0 16 16" width="16" height="16">
+              <path d="M13.5 2H13V1c0-.6-.4-1-1-1s-1 .4-1 1v1H5V1c0-.6-.4-1-1-1S3 .4 3 1v1h-.5C1.1 2 0 3.1 0 4.5v9C0 14.9 1.1 16 2.5 16h11c1.4 0 2.5-1.1 2.5-2.5v-9C16 3.1 14.9 2 13.5 2zm0 12.5h-11c-.6 0-1-.4-1-1V6h13v7.5c0 .6-.4 1-1 1z"/>
+            </svg>
+          </button>
+        </div>
+      </div>`,
+      "application/xml"
+    );
+
+    this.shadowRoot.importNodeAndAppendChildAt(
+      this.shadowRoot,
+      parserDoc.documentElement,
+      true
+    );
+    this.l10n.translateRoots();
+  }
+
+  get FIELD_EVENTS() {
+    return ["focus", "blur", "copy", "cut", "paste"];
+  }
+
+  get CONTROL_EVENTS() {
+    return [
+      "MozDateTimeValueChanged",
+      "MozNotifyMinMaxStepAttrChanged",
+      "MozDateTimeAttributeChanged",
+      "MozPickerValueChanged",
+      "MozSetDateTimePickerState",
+      "MozDateTimeShowPickerForJS",
+    ];
+  }
+
+  get showPickerOnClick() {
+    return this.isAndroid || this.type == "time";
+  }
+
+  addEventListenersToField(aElement) {
+    // These events don't bubble out of the Shadow DOM, so we'll have to add
+    // event listeners specifically on each of the fields, not just
+    // on the <input>
+    this.FIELD_EVENTS.forEach(eventName => {
+      aElement.addEventListener(
+        eventName,
+        this,
+        { mozSystemGroup: true },
+        false
+      );
+    });
+  }
+
+  removeEventListenersToField(aElement) {
+    if (!aElement) {
+      return;
+    }
+
+    this.FIELD_EVENTS.forEach(eventName => {
+      aElement.removeEventListener(eventName, this, { mozSystemGroup: true });
+    });
+  }
+
+  log(aMsg) {
+    if (this.DEBUG) {
+      this.window.dump("[DateTimeBox] " + aMsg + "\n");
+    }
+  }
+
+  createEditFieldAndAppend(
+    aL10nId,
+    aPlaceholderId,
+    aIsNumeric,
+    aMinDigits,
+    aMaxLength,
+    aMinValue,
+    aMaxValue,
+    aPageUpDownInterval
+  ) {
+    let root = this.shadowRoot.getElementById("edit-wrapper");
+    let field = this.shadowRoot.createElementAndAppendChildAt(root, "span");
+    field.classList.add("datetime-edit-field");
+    field.setAttribute("aria-valuetext", "");
+    this.setFieldTabIndexAttribute(field);
+
+    const placeholder = this.l10n.formatValueSync(aPlaceholderId);
+    field.placeholder = placeholder;
+    field.textContent = placeholder;
+    this.l10n.setAttributes(field, aL10nId);
+
+    field.setAttribute("readonly", this.mInputElement.readOnly);
+    field.setAttribute("disabled", this.mInputElement.disabled);
+    // Set property as well for convenience.
+    field.disabled = this.mInputElement.disabled;
+    field.readOnly = this.mInputElement.readOnly;
+
+    // Used to store the non-formatted value, cleared when value is
+    // cleared.
+    // DateTimeInputTypeBase::HasBadInput() will read this to decide
+    // if the input has value.
+    field.setAttribute("value", "");
+
+    if (aIsNumeric) {
+      field.classList.add("numeric");
+      // Maximum value allowed.
+      field.setAttribute("min", aMinValue);
+      // Minumim value allowed.
+      field.setAttribute("max", aMaxValue);
+      // Interval when pressing pageUp/pageDown key.
+      field.setAttribute("pginterval", aPageUpDownInterval);
+      // Used to store what the user has already typed in the field,
+      // cleared when value is cleared and when field is blurred.
+      field.setAttribute("typeBuffer", "");
+      // Minimum digits to display, padded with leading 0s.
+      field.setAttribute("mindigits", aMinDigits);
+      // Maximum length for the field, will be advance to the next field
+      // automatically if exceeded.
+      field.setAttribute("maxlength", aMaxLength);
+      // Set spinbutton ARIA role
+      field.setAttribute("role", "spinbutton");
+
+      if (this.mIsRTL) {
+        // Force the direction to be "ltr", so that the field stays in the
+        // same order even when it's empty (with placeholder). By using
+        // "embed", the text inside the element is still displayed based
+        // on its directionality.
+        field.style.unicodeBidi = "embed";
+        field.style.direction = "ltr";
+      }
+    } else {
+      // Set generic textbox ARIA role
+      field.setAttribute("role", "textbox");
+    }
+
+    return field;
+  }
+
+  updateCalendarButtonState(isExpanded) {
+    this.mCalendarButton.setAttribute("aria-expanded", isExpanded);
+  }
+
+  notifyInputElementValueChanged() {
+    this.log("inputElementValueChanged");
+    this.setFieldsFromInputValue();
+  }
+
+  notifyMinMaxStepAttrChanged() {
+    // Second and millisecond part are optional, rebuild edit fields if
+    // needed.
+    this.rebuildEditFieldsIfNeeded();
+    // Fill in values again.
+    this.setFieldsFromInputValue();
+  }
+
+  setValueFromPicker(aValue) {
+    if (aValue) {
+      this.setFieldsFromPicker(aValue);
+    } else {
+      this.clearInputFields();
+    }
+  }
+
+  advanceToNextField(aReverse) {
+    this.log("advanceToNextField");
+
+    let focusedInput = this.mLastFocusedElement;
+    let next = aReverse
+      ? focusedInput.previousElementSibling
+      : focusedInput.nextElementSibling;
+    if (!next && !aReverse) {
+      this.setInputValueFromFields();
+      return;
+    }
+
+    while (next) {
+      if (next.matches("span.datetime-edit-field")) {
+        next.focus();
+        break;
+      }
+      next = aReverse ? next.previousElementSibling : next.nextElementSibling;
+    }
+  }
+
+  setPickerState(aIsOpen) {
+    this.log("picker is now " + (aIsOpen ? "opened" : "closed"));
+    this.mIsPickerOpen = aIsOpen;
+    // Calendar button's expanded state mirrors this.mIsPickerOpen
+    this.updateCalendarButtonState(this.mIsPickerOpen);
+  }
+
+  setFieldTabIndexAttribute(field) {
+    if (this.mInputElement.disabled) {
+      field.removeAttribute("tabindex");
+    } else {
+      field.tabIndex = this.mInputElement.tabIndex;
+    }
+  }
+
+  updateEditAttributes() {
+    this.log("updateEditAttributes");
+
+    let editRoot = this.shadowRoot.getElementById("edit-wrapper");
+
+    for (let child of editRoot.querySelectorAll(
+      ":scope > span.datetime-edit-field"
+    )) {
+      // "disabled" and "readonly" must be set as attributes because they
+      // are not defined properties of HTMLSpanElement, and the stylesheet
+      // checks the literal string attribute values.
+      child.setAttribute("disabled", this.mInputElement.disabled);
+      child.setAttribute("readonly", this.mInputElement.readOnly);
+
+      // Set property as well for convenience.
+      child.disabled = this.mInputElement.disabled;
+      child.readOnly = this.mInputElement.readOnly;
+
+      this.setFieldTabIndexAttribute(child);
+    }
+
+    this.mCalendarButton.hidden =
+      this.mInputElement.disabled ||
+      this.mInputElement.readOnly ||
+      this.mInputElement.type === "time";
+  }
+
+  isEmpty(aValue) {
+    return aValue == undefined || 0 === aValue.length;
+  }
+
+  getFieldValue(aField) {
+    if (!aField || !aField.classList.contains("numeric")) {
+      return undefined;
+    }
+
+    let value = aField.getAttribute("value");
+    // Avoid returning 0 when field is empty.
+    return this.isEmpty(value) ? undefined : Number(value);
+  }
+
+  clearFieldValue(aField) {
+    aField.textContent = aField.placeholder;
+    aField.setAttribute("value", "");
+    aField.setAttribute("aria-valuetext", "");
+    if (aField.classList.contains("numeric")) {
+      aField.setAttribute("typeBuffer", "");
+    }
+  }
+
+  openDateTimePicker() {
+    this.mInputElement.openDateTimePicker(this.getCurrentValue());
+  }
+
+  closeDateTimePicker() {
+    if (this.mIsPickerOpen) {
+      this.mInputElement.closeDateTimePicker();
+    }
+  }
+
+  notifyPicker() {
+    if (this.mIsPickerOpen && this.isAnyFieldAvailable(true)) {
+      this.mInputElement.updateDateTimePicker(this.getCurrentValue());
+    }
+  }
+
+  isDisabled() {
+    return this.mInputElement.hasAttribute("disabled");
+  }
+
+  isReadonly() {
+    return this.mInputElement.hasAttribute("readonly");
+  }
+
+  isEditable() {
+    return !this.isDisabled() && !this.isReadonly();
+  }
+
+  isRequired() {
+    return this.mInputElement.hasAttribute("required");
+  }
+
+  containingTree() {
+    return this.mInputElement.containingShadowRoot || this.document;
+  }
+
+  handleEvent(aEvent) {
+    this.log("handleEvent: " + aEvent.type);
+
+    if (!aEvent.isTrusted) {
+      return;
+    }
+
+    switch (aEvent.type) {
+      case "MozDateTimeValueChanged": {
+        this.notifyInputElementValueChanged();
+        break;
+      }
+      case "MozNotifyMinMaxStepAttrChanged": {
+        this.notifyMinMaxStepAttrChanged();
+        break;
+      }
+      case "MozDateTimeAttributeChanged": {
+        this.updateEditAttributes();
+        break;
+      }
+      case "MozPickerValueChanged": {
+        this.setValueFromPicker(aEvent.detail);
+        break;
+      }
+      case "MozSetDateTimePickerState": {
+        this.setPickerState(aEvent.detail);
+        break;
+      }
+      case "MozDateTimeShowPickerForJS": {
+        this.openDateTimePicker();
+        break;
+      }
+      case "keydown": {
+        this.onKeyDown(aEvent);
+        break;
+      }
+      case "click": {
+        this.onClick(aEvent);
+        break;
+      }
+      case "focus": {
+        this.onFocus(aEvent);
+        break;
+      }
+      case "blur": {
+        this.onBlur(aEvent);
+        break;
+      }
+      case "mousedown":
+      case "copy":
+      case "cut":
+      case "paste": {
+        aEvent.preventDefault();
+        break;
+      }
+      default:
+        break;
+    }
+  }
+
+  onFocus(aEvent) {
+    this.log("onFocus originalTarget: " + aEvent.originalTarget);
+    if (this.containingTree().activeElement != this.mInputElement) {
+      return;
+    }
+
+    let target = aEvent.originalTarget;
+    if (target.matches(".datetime-edit-field,.datetime-calendar-button")) {
+      if (target.disabled) {
+        return;
+      }
+      this.mLastFocusedElement = target;
+      this.mInputElement.setFocusState(true);
+    }
+    if (this.mIsPickerOpen && this.isPickerIrrelevantField(target)) {
+      this.closeDateTimePicker();
+    }
+  }
+
+  onBlur(aEvent) {
+    this.log(
+      "onBlur originalTarget: " +
+        aEvent.originalTarget +
+        " target: " +
+        aEvent.target +
+        " rt: " +
+        aEvent.relatedTarget +
+        " open: " +
+        this.mIsPickerOpen
+    );
+
+    let target = aEvent.originalTarget;
+    target.setAttribute("typeBuffer", "");
+    this.setInputValueFromFields();
+    // No need to set and unset the focus state (or closing the picker) if the
+    // focus is staying within our input.
+    if (aEvent.relatedTarget == this.mInputElement) {
+      return;
+    }
+
+    // If we're in chrome and the focus moves to a separate document
+    // (relatedTarget is null) we also don't want to close it, since it
+    // could've moved to the datetime popup itself.
+    if (
+      !aEvent.relatedTarget &&
+      this.window.isChromeWindow &&
+      this.window == this.window.top
+    ) {
+      return;
+    }
+
+    this.mInputElement.setFocusState(false);
+    if (this.mIsPickerOpen) {
+      this.closeDateTimePicker();
+    }
+  }
+
+  isTimeField(field) {
+    return (
+      field == this.mHourField ||
+      field == this.mMinuteField ||
+      field == this.mSecondField ||
+      field == this.mDayPeriodField
+    );
+  }
+
+  shouldOpenDateTimePickerOnKeyDown() {
+    if (!this.mLastFocusedElement) {
+      return true;
+    }
+    return !this.isPickerIrrelevantField(this.mLastFocusedElement);
+  }
+
+  shouldOpenDateTimePickerOnClick(target) {
+    return !this.isPickerIrrelevantField(target);
+  }
+
+  // Whether a given field is irrelevant for the purposes of the datetime
+  // picker. This is useful for datetime-local, which as of right now only
+  // shows a date picker (not a time picker).
+  isPickerIrrelevantField(field) {
+    if (this.type != "datetime-local") {
+      return false;
+    }
+    return this.isTimeField(field);
+  }
+
+  onKeyDown(aEvent) {
+    this.log("onKeyDown key: " + aEvent.key);
+
+    switch (aEvent.key) {
+      // Toggle the picker on Space/Enter on Calendar button or Space on input,
+      // close on Escape anywhere.
+      case "Escape": {
+        if (this.mIsPickerOpen) {
+          this.closeDateTimePicker();
+          aEvent.preventDefault();
+        }
+        break;
+      }
+      case "Enter":
+      case " ": {
+        // always close, if opened
+        if (this.mIsPickerOpen) {
+          this.closeDateTimePicker();
+        } else if (
+          // open on Space from anywhere within the input
+          aEvent.key == " " &&
+          this.shouldOpenDateTimePickerOnKeyDown()
+        ) {
+          this.openDateTimePicker();
+        } else if (
+          // open from the Calendar button on either keydown
+          aEvent.originalTarget == this.mCalendarButton &&
+          this.shouldOpenDateTimePickerOnKeyDown()
+        ) {
+          this.openDateTimePicker();
+        } else {
+          // Don't preventDefault();
+          break;
+        }
+        aEvent.preventDefault();
+        break;
+      }
+      case "Delete":
+      case "Backspace": {
+        if (aEvent.originalTarget == this.mCalendarButton) {
+          // Do not remove Calendar button
+          aEvent.preventDefault();
+          break;
+        }
+        if (this.isEditable()) {
+          // TODO(emilio, bug 1571533): These functions should look at
+          // defaultPrevented.
+          // Ctrl+Backspace/Delete on non-macOS and
+          // Cmd+Backspace/Delete on macOS to clear the field
+          if (aEvent.getModifierState("Accel")) {
+            // Clear the input's value
+            this.clearInputFields(false);
+          } else {
+            let targetField = aEvent.originalTarget;
+            this.clearFieldValue(targetField);
+            this.setInputValueFromFields();
+          }
+          aEvent.preventDefault();
+        }
+        break;
+      }
+      case "ArrowRight":
+      case "ArrowLeft": {
+        this.advanceToNextField(!(aEvent.key == "ArrowRight"));
+        aEvent.preventDefault();
+        break;
+      }
+      case "ArrowUp":
+      case "ArrowDown":
+      case "PageUp":
+      case "PageDown":
+      case "Home":
+      case "End": {
+        this.handleKeyboardNav(aEvent);
+        aEvent.preventDefault();
+        break;
+      }
+      default: {
+        // Handle printable characters (e.g. letters, digits and numpad digits)
+        if (
+          aEvent.key.length === 1 &&
+          !(aEvent.ctrlKey || aEvent.altKey || aEvent.metaKey)
+        ) {
+          this.handleKeydown(aEvent);
+          aEvent.preventDefault();
+        }
+        break;
+      }
+    }
+  }
+
+  onClick(aEvent) {
+    this.log(
+      "onClick originalTarget: " +
+        aEvent.originalTarget +
+        " target: " +
+        aEvent.target
+    );
+
+    if (aEvent.defaultPrevented || !this.isEditable()) {
+      return;
+    }
+
+    // We toggle the picker on click on the Calendar button on any platform.
+    // For Android and for type=time inputs, we also toggle the picker when
+    // clicking on the input field.
+    //
+    // We do not toggle the picker when clicking the input field for Calendar
+    // on desktop to avoid interfering with the default Calendar behavior.
+    if (
+      aEvent.originalTarget == this.mCalendarButton ||
+      this.showPickerOnClick
+    ) {
+      if (
+        !this.mIsPickerOpen &&
+        this.shouldOpenDateTimePickerOnClick(aEvent.originalTarget)
+      ) {
+        this.openDateTimePicker();
+      } else {
+        this.closeDateTimePicker();
+      }
+    }
+  }
+
+  buildEditFields() {
+    let root = this.shadowRoot.getElementById("edit-wrapper");
+
+    let options = {};
+
+    if (this.shouldShowTime()) {
+      options.hour = options.minute = "numeric";
+      options.hour12 = this.mHour12;
+      if (this.shouldShowSecondField()) {
+        options.second = "numeric";
+      }
+    }
+
+    if (this.shouldShowDate()) {
+      options.year = options.month = options.day = "numeric";
+    }
+
+    let formatter = Intl.DateTimeFormat(this.mLocales, options);
+    formatter.formatToParts(Date.now()).map(part => {
+      switch (part.type) {
+        case "year":
+          this.mYearField = this.createEditFieldAndAppend(
+            "datetime-year",
+            "datetime-year-placeholder",
+            true,
+            this.mYearLength,
+            this.mMaxYear.toString().length,
+            this.mMinYear,
+            this.mMaxYear,
+            this.mYearPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mYearField);
+          break;
+        case "month":
+          this.mMonthField = this.createEditFieldAndAppend(
+            "datetime-month",
+            "datetime-month-placeholder",
+            true,
+            this.mMonthDayLength,
+            this.mMonthDayLength,
+            this.mMinMonth,
+            this.mMaxMonth,
+            this.mMonthPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mMonthField);
+          break;
+        case "day":
+          this.mDayField = this.createEditFieldAndAppend(
+            "datetime-day",
+            "datetime-day-placeholder",
+            true,
+            this.mMonthDayLength,
+            this.mMonthDayLength,
+            this.mMinDay,
+            this.mMaxDay,
+            this.mDayPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mDayField);
+          break;
+        case "hour":
+          this.mHourField = this.createEditFieldAndAppend(
+            "datetime-hour",
+            "datetime-time-placeholder",
+            true,
+            this.mMaxLength,
+            this.mMaxLength,
+            this.mMinHour,
+            this.mMaxHour,
+            this.mHourPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mHourField);
+          break;
+        case "minute":
+          this.mMinuteField = this.createEditFieldAndAppend(
+            "datetime-minute",
+            "datetime-time-placeholder",
+            true,
+            this.mMaxLength,
+            this.mMaxLength,
+            this.mMinMinute,
+            this.mMaxMinute,
+            this.mMinSecPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mMinuteField);
+          break;
+        case "second":
+          this.mSecondField = this.createEditFieldAndAppend(
+            "datetime-second",
+            "datetime-time-placeholder",
+            true,
+            this.mMaxLength,
+            this.mMaxLength,
+            this.mMinSecond,
+            this.mMaxSecond,
+            this.mMinSecPageUpDownInterval
+          );
+          this.addEventListenersToField(this.mSecondField);
+          if (this.shouldShowMillisecField()) {
+            // Intl.DateTimeFormat does not support millisecond, so we
+            // need to handle this on our own.
+            let span = this.shadowRoot.createElementAndAppendChildAt(
+              root,
+              "span"
+            );
+            span.textContent = this.mMillisecSeparatorText;
+            this.mMillisecField = this.createEditFieldAndAppend(
+              "datetime-millisecond",
+              "datetime-time-placeholder",
+              true,
+              this.mMillisecMaxLength,
+              this.mMillisecMaxLength,
+              this.mMinMillisecond,
+              this.mMaxMillisecond,
+              this.mMinSecPageUpDownInterval
+            );
+            this.addEventListenersToField(this.mMillisecField);
+          }
+          break;
+        case "dayPeriod":
+          this.mDayPeriodField = this.createEditFieldAndAppend(
+            "datetime-dayperiod",
+            "datetime-time-placeholder",
+            false
+          );
+          this.addEventListenersToField(this.mDayPeriodField);
+
+          // Give aria autocomplete hint for am/pm
+          this.mDayPeriodField.setAttribute("aria-autocomplete", "inline");
+          break;
+        default:
+          let span = this.shadowRoot.createElementAndAppendChildAt(
+            root,
+            "span"
+          );
+          span.textContent = part.value;
+          break;
+      }
+    });
+  }
+
+  buildCalendarBtn() {
+    this.addEventListenersToField(this.mCalendarButton);
+    // This is to open the picker when a Calendar button is clicked (this
+    // includes padding area).
+    this.mCalendarButton.addEventListener(
+      "click",
+      this,
+      { mozSystemGroup: true },
+      false
+    );
+  }
+
+  clearInputFields(aFromInputElement) {
+    this.log("clearInputFields");
+
+    if (this.mMonthField) {
+      this.clearFieldValue(this.mMonthField);
+    }
+
+    if (this.mDayField) {
+      this.clearFieldValue(this.mDayField);
+    }
+
+    if (this.mYearField) {
+      this.clearFieldValue(this.mYearField);
+    }
+
+    if (this.mHourField) {
+      this.clearFieldValue(this.mHourField);
+    }
+
+    if (this.mMinuteField) {
+      this.clearFieldValue(this.mMinuteField);
+    }
+
+    if (this.mSecondField) {
+      this.clearFieldValue(this.mSecondField);
+    }
+
+    if (this.mMillisecField) {
+      this.clearFieldValue(this.mMillisecField);
+    }
+
+    if (this.mDayPeriodField) {
+      this.clearFieldValue(this.mDayPeriodField);
+    }
+
+    if (!aFromInputElement) {
+      if (this.mInputElement.value) {
+        this.mInputElement.setUserInput("");
+      } else {
+        this.mInputElement.updateValidityState();
+      }
+    }
+  }
+
+  setFieldsFromInputValue() {
+    // Second and millisecond part are optional, rebuild edit fields if
+    // needed.
+    this.rebuildEditFieldsIfNeeded();
+
+    let value = this.mInputElement.value;
+    if (!value) {
+      this.clearInputFields(true);
+      return;
+    }
+
+    let { year, month, day, hour, minute, second, millisecond } =
+      this.getInputElementValues();
+    if (this.shouldShowDate()) {
+      this.log("setFieldsFromInputValue: " + value);
+      this.setFieldValue(this.mYearField, year);
+      this.setFieldValue(this.mMonthField, month);
+      this.setFieldValue(this.mDayField, day);
+    }
+
+    if (this.shouldShowTime()) {
+      if (this.isEmpty(hour) && this.isEmpty(minute)) {
+        this.clearInputFields(true);
+        return;
+      }
+
+      this.setFieldValue(this.mHourField, hour);
+      this.setFieldValue(this.mMinuteField, minute);
+      if (this.mHour12) {
+        this.setDayPeriodValue(
+          hour >= this.mMaxHour ? this.mPMIndicator : this.mAMIndicator
+        );
+      }
+
+      if (this.mSecondField) {
+        this.setFieldValue(this.mSecondField, second || 0);
+      }
+
+      if (this.mMillisecField) {
+        this.setFieldValue(this.mMillisecField, millisecond || 0);
+      }
+    }
+
+    this.notifyPicker();
+  }
+
+  setInputValueFromFields() {
+    if (this.isAnyFieldEmpty()) {
+      // Clear input element's value if any of the field has been cleared,
+      // otherwise update the validity state, since it may become "not"
+      // invalid if fields are not complete.
+      if (this.mInputElement.value) {
+        this.mInputElement.setUserInput("");
+      } else {
+        this.mInputElement.updateValidityState();
+      }
+      // We still need to notify picker in case any of the field has
+      // changed.
+      this.notifyPicker();
+      return;
+    }
+
+    let { year, month, day, hour, minute, second, millisecond, dayPeriod } =
+      this.getCurrentValue();
+
+    let time = "";
+    let date = "";
+
+    // Convert to a valid time string according to:
+    // https://html.spec.whatwg.org/multipage/infrastructure.html#valid-time-string
+    if (this.shouldShowTime()) {
+      if (this.mHour12) {
+        if (dayPeriod == this.mPMIndicator && hour < this.mMaxHour) {
+          hour += this.mMaxHour;
+        } else if (dayPeriod == this.mAMIndicator && hour == this.mMaxHour) {
+          hour = 0;
+        }
+      }
+
+      hour = hour < 10 ? "0" + hour : hour;
+      minute = minute < 10 ? "0" + minute : minute;
+
+      time = hour + ":" + minute;
+      if (second != undefined) {
+        second = second < 10 ? "0" + second : second;
+        time += ":" + second;
+      }
+
+      if (millisecond != undefined) {
+        // Convert milliseconds to fraction of second.
+        millisecond = millisecond
+          .toString()
+          .padStart(this.mMillisecMaxLength, "0");
+        time += "." + millisecond;
+      }
+    }
+
+    if (this.shouldShowDate()) {
+      // Convert to a valid date string according to:
+      // https://html.spec.whatwg.org/multipage/infrastructure.html#valid-date-string
+      year = year.toString().padStart(this.mYearLength, "0");
+      month = month < 10 ? "0" + month : month;
+      day = day < 10 ? "0" + day : day;
+      date = [year, month, day].join("-");
+    }
+
+    let value;
+    if (date) {
+      value = date;
+    }
+    if (time) {
+      // https://html.spec.whatwg.org/#valid-normalised-local-date-and-time-string
+      value = value ? value + "T" + time : time;
+    }
+
+    if (value == this.mInputElement.value) {
+      return;
+    }
+    this.log("setInputValueFromFields: " + value);
+    this.notifyPicker();
+    this.mInputElement.setUserInput(value);
+  }
+
+  setFieldsFromPicker({ year, month, day, hour, minute }) {
+    if (!this.isEmpty(hour)) {
+      this.setFieldValue(this.mHourField, hour);
+      if (this.mHour12) {
+        this.setDayPeriodValue(
+          hour >= this.mMaxHour ? this.mPMIndicator : this.mAMIndicator
+        );
+      }
+    }
+
+    if (!this.isEmpty(minute)) {
+      this.setFieldValue(this.mMinuteField, minute);
+    }
+
+    if (!this.isEmpty(year)) {
+      this.setFieldValue(this.mYearField, year);
+    }
+
+    if (!this.isEmpty(month)) {
+      this.setFieldValue(this.mMonthField, month);
+    }
+
+    if (!this.isEmpty(day)) {
+      this.setFieldValue(this.mDayField, day);
+    }
+
+    // Update input element's .value if needed.
+    this.setInputValueFromFields();
+  }
+
+  handleKeydown(aEvent) {
+    if (!this.isEditable()) {
+      return;
+    }
+
+    let targetField = aEvent.originalTarget;
+    let key = aEvent.key;
+
+    if (targetField == this.mDayPeriodField) {
+      if (key == "a" || key == "A") {
+        this.setDayPeriodValue(this.mAMIndicator);
+      } else if (key == "p" || key == "P") {
+        this.setDayPeriodValue(this.mPMIndicator);
+      }
+      if (!this.isAnyFieldEmpty()) {
+        this.setInputValueFromFields();
+      }
+      return;
+    }
+
+    if (targetField.classList.contains("numeric") && key.match(/[0-9]/)) {
+      let buffer = targetField.getAttribute("typeBuffer") || "";
+
+      buffer = buffer.concat(key);
+      this.setFieldValue(targetField, buffer);
+
+      let n = Number(buffer);
+      let max = targetField.getAttribute("max");
+      let maxLength = targetField.getAttribute("maxlength");
+      if (targetField == this.mHourField) {
+        if (n * 10 > 23 || buffer.length === 2) {
+          buffer = "";
+          this.advanceToNextField();
+        }
+      } else if (buffer.length >= maxLength || n * 10 > max) {
+        buffer = "";
+        this.advanceToNextField();
+      }
+      targetField.setAttribute("typeBuffer", buffer);
+      if (!this.isAnyFieldEmpty()) {
+        this.setInputValueFromFields();
+      }
+    }
+  }
+
+  getCurrentValue() {
+    let value = {};
+    if (this.shouldShowDate()) {
+      value.year = this.getFieldValue(this.mYearField);
+      value.month = this.getFieldValue(this.mMonthField);
+      value.day = this.getFieldValue(this.mDayField);
+    }
+
+    if (this.shouldShowTime()) {
+      let dayPeriod = this.getDayPeriodValue();
+      let hour = this.getFieldValue(this.mHourField);
+      if (!this.isEmpty(hour)) {
+        if (this.mHour12) {
+          if (dayPeriod == this.mPMIndicator && hour < this.mMaxHour) {
+            hour += this.mMaxHour;
+          } else if (dayPeriod == this.mAMIndicator && hour == this.mMaxHour) {
+            hour = 0;
+          }
+        }
+      }
+      value.hour = hour;
+      value.dayPeriod = dayPeriod;
+      value.minute = this.getFieldValue(this.mMinuteField);
+      value.second = this.getFieldValue(this.mSecondField);
+      value.millisecond = this.getFieldValue(this.mMillisecField);
+    }
+
+    this.log("getCurrentValue: " + JSON.stringify(value));
+    return value;
+  }
+
+  setFieldValue(aField, aValue) {
+    if (!aField || !aField.classList.contains("numeric")) {
+      return;
+    }
+
+    let value = Number(aValue);
+    if (isNaN(value)) {
+      this.log("NaN on setFieldValue!");
+      return;
+    }
+
+    if (aField == this.mHourField) {
+      if (this.mHour12) {
+        // Try to change to 12hr format if user input is 0 or greater
+        // than 12.
+        switch (true) {
+          case value == 0 && aValue.length == 2:
+            value = this.mMaxHour;
+            this.setDayPeriodValue(this.mAMIndicator);
+            break;
+
+          case value == this.mMaxHour:
+            this.setDayPeriodValue(this.mPMIndicator);
+            break;
+
+          case value < 12:
+            if (!this.getDayPeriodValue()) {
+              this.setDayPeriodValue(this.mAMIndicator);
+            }
+            break;
+
+          case value > 12 && value < 24:
+            value = value % this.mMaxHour;
+            this.setDayPeriodValue(this.mPMIndicator);
+            break;
+
+          default:
+            value = Math.floor(value / 10);
+            break;
+        }
+      } else if (value > this.mMaxHour) {
+        value = this.mMaxHour;
+      }
+    }
+
+    let maxLength = aField.getAttribute("maxlength");
+    if (aValue.length == maxLength) {
+      let min = Number(aField.getAttribute("min"));
+      let max = Number(aField.getAttribute("max"));
+
+      if (value < min) {
+        value = min;
+      } else if (value > max) {
+        value = max;
+      }
+    }
+
+    aField.setAttribute("value", value);
+
+    let minDigits = aField.getAttribute("mindigits");
+    let formatted = value.toLocaleString(this.mLocales, {
+      minimumIntegerDigits: minDigits,
+      useGrouping: false,
+    });
+
+    aField.textContent = formatted;
+    aField.setAttribute("aria-valuetext", formatted);
+  }
+
+  isAnyFieldAvailable(aForPicker = false) {
+    let { year, month, day, hour, minute, second, millisecond } =
+      this.getCurrentValue();
+    if (
+      !this.isEmpty(year) ||
+      !this.isEmpty(month) ||
+      !this.isEmpty(day) ||
+      !this.isEmpty(hour) ||
+      !this.isEmpty(minute)
+    ) {
+      return true;
+    }
+
+    // Picker doesn't care about seconds / milliseconds / day period.
+    if (aForPicker) {
+      return false;
+    }
+
+    let dayPeriod = this.getDayPeriodValue();
+    return (
+      (this.mDayPeriodField && !this.isEmpty(dayPeriod)) ||
+      (this.mSecondField && !this.isEmpty(second)) ||
+      (this.mMillisecField && !this.isEmpty(millisecond))
+    );
+  }
+
+  isAnyFieldEmpty() {
+    let { year, month, day, hour, minute, second, millisecond } =
+      this.getCurrentValue();
+    return (
+      (this.mYearField && this.isEmpty(year)) ||
+      (this.mMonthField && this.isEmpty(month)) ||
+      (this.mDayField && this.isEmpty(day)) ||
+      (this.mHourField && this.isEmpty(hour)) ||
+      (this.mMinuteField && this.isEmpty(minute)) ||
+      (this.mDayPeriodField && this.isEmpty(this.getDayPeriodValue())) ||
+      (this.mSecondField && this.isEmpty(second)) ||
+      (this.mMillisecField && this.isEmpty(millisecond))
+    );
+  }
+
+  get kMsPerSecond() {
+    return 1000;
+  }
+
+  get kMsPerMinute() {
+    return 60 * 1000;
+  }
+
+  getInputElementValues() {
+    let value = this.mInputElement.value;
+    if (value.length === 0) {
+      return {};
+    }
+
+    let date, time;
+
+    let year, month, day, hour, minute, second, millisecond;
+    if (this.type == "date") {
+      date = value;
+    }
+    if (this.type == "time") {
+      time = value;
+    }
+    if (this.type == "datetime-local") {
+      // https://html.spec.whatwg.org/#valid-normalised-local-date-and-time-string
+      [date, time] = value.split("T");
+    }
+    if (date) {
+      [year, month, day] = date.split("-");
+    }
+    if (time) {
+      [hour, minute, second] = time.split(":");
+      if (second) {
+        [second, millisecond] = second.split(".");
+
+        // Convert fraction of second to milliseconds.
+        if (millisecond && millisecond.length === 1) {
+          millisecond *= 100;
+        } else if (millisecond && millisecond.length === 2) {
+          millisecond *= 10;
+        }
+      }
+    }
+    return { year, month, day, hour, minute, second, millisecond };
+  }
+
+  shouldShowSecondField() {
+    if (!this.shouldShowTime()) {
+      return false;
+    }
+    let { second } = this.getInputElementValues();
+    if (second != undefined) {
+      return true;
+    }
+
+    let stepBase = this.mInputElement.getStepBase();
+    if (stepBase % this.kMsPerMinute != 0) {
+      return true;
+    }
+
+    let step = this.mInputElement.getStep();
+    if (step % this.kMsPerMinute != 0) {
+      return true;
+    }
+
+    return false;
+  }
+
+  shouldShowMillisecField() {
+    if (!this.shouldShowTime()) {
+      return false;
+    }
+
+    let { millisecond } = this.getInputElementValues();
+    if (millisecond != undefined) {
+      return true;
+    }
+
+    let stepBase = this.mInputElement.getStepBase();
+    if (stepBase % this.kMsPerSecond != 0) {
+      return true;
+    }
+
+    let step = this.mInputElement.getStep();
+    if (step % this.kMsPerSecond != 0) {
+      return true;
+    }
+
+    return false;
+  }
+
+  getStringsForLocale(aLocales) {
+    this.log("getStringsForLocale: " + aLocales);
+
+    let intlUtils = this.window.intlUtils;
+    if (!intlUtils) {
+      return {};
+    }
+
+    let result = intlUtils.getDisplayNames(this.mLocales, {
+      type: "dayPeriod",
+      style: "short",
+      calendar: "gregory",
+      keys: ["am", "pm"],
+    });
+
+    let [amString, pmString] = result.values;
+
+    return { amString, pmString };
+  }
+
+  is12HourTime(aLocales) {
+    let options = new Intl.DateTimeFormat(aLocales, {
+      hour: "numeric",
+    }).resolvedOptions();
+
+    return options.hour12;
+  }
+
+  incrementFieldValue(aTargetField, aTimes) {
+    let value = this.getFieldValue(aTargetField);
+
+    // Use current time if field is empty.
+    if (this.isEmpty(value)) {
+      let now = new Date();
+
+      if (aTargetField == this.mYearField) {
+        value = now.getFullYear();
+      } else if (aTargetField == this.mMonthField) {
+        value = now.getMonth() + 1;
+      } else if (aTargetField == this.mDayField) {
+        value = now.getDate();
+      } else if (aTargetField == this.mHourField) {
+        value = now.getHours();
+        if (this.mHour12) {
+          value = value % this.mMaxHour || this.mMaxHour;
+        }
+      } else if (aTargetField == this.mMinuteField) {
+        value = now.getMinutes();
+      } else if (aTargetField == this.mSecondField) {
+        value = now.getSeconds();
+      } else if (aTargetField == this.mMillisecField) {
+        value = now.getMilliseconds();
+      } else {
+        this.log("Field not supported in incrementFieldValue.");
+        return;
+      }
+    }
+
+    let min = +aTargetField.getAttribute("min");
+    let max = +aTargetField.getAttribute("max");
+
+    value += Number(aTimes);
+    if (value > max) {
+      value -= max - min + 1;
+    } else if (value < min) {
+      value += max - min + 1;
+    }
+
+    this.setFieldValue(aTargetField, value);
+  }
+
+  handleKeyboardNav(aEvent) {
+    if (!this.isEditable()) {
+      return;
+    }
+
+    let targetField = aEvent.originalTarget;
+    let key = aEvent.key;
+
+    if (targetField == this.mYearField && (key == "Home" || key == "End")) {
+      // Home/End key does nothing on year field.
+      return;
+    }
+
+    if (targetField == this.mDayPeriodField) {
+      // Home/End key does nothing on AM/PM field.
+      if (key == "Home" || key == "End") {
+        return;
+      }
+
+      this.setDayPeriodValue(
+        this.getDayPeriodValue() == this.mAMIndicator
+          ? this.mPMIndicator
+          : this.mAMIndicator
+      );
+      this.setInputValueFromFields();
+      return;
+    }
+
+    switch (key) {
+      case "ArrowUp":
+        this.incrementFieldValue(targetField, 1);
+        break;
+      case "ArrowDown":
+        this.incrementFieldValue(targetField, -1);
+        break;
+      case "PageUp": {
+        let interval = targetField.getAttribute("pginterval");
+        this.incrementFieldValue(targetField, interval);
+        break;
+      }
+      case "PageDown": {
+        let interval = targetField.getAttribute("pginterval");
+        this.incrementFieldValue(targetField, 0 - interval);
+        break;
+      }
+      case "Home":
+        let min = targetField.getAttribute("min");
+        this.setFieldValue(targetField, min);
+        break;
+      case "End":
+        let max = targetField.getAttribute("max");
+        this.setFieldValue(targetField, max);
+        break;
+    }
+    this.setInputValueFromFields();
+  }
+
+  getDayPeriodValue() {
+    if (!this.mDayPeriodField) {
+      return "";
+    }
+
+    let placeholder = this.mDayPeriodField.placeholder;
+    let value = this.mDayPeriodField.textContent;
+    return value == placeholder ? "" : value;
+  }
+
+  setDayPeriodValue(aValue) {
+    if (!this.mDayPeriodField) {
+      return;
+    }
+
+    this.mDayPeriodField.textContent = aValue;
+    this.mDayPeriodField.setAttribute("value", aValue);
+  }
+};