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Web component providing a date selection field with scrollable month calendar
/**
* @license
* Copyright (c) 2016 - 2024 Vaadin Ltd.
* This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
*/
import { flush } from '@polymer/polymer/lib/utils/flush.js';
import { afterNextRender } from '@polymer/polymer/lib/utils/render-status.js';
import { timeOut } from '@vaadin/component-base/src/async.js';
import { Debouncer } from '@vaadin/component-base/src/debounce.js';
import { addListener, setTouchAction } from '@vaadin/component-base/src/gestures.js';
import { MediaQueryController } from '@vaadin/component-base/src/media-query-controller.js';
import { SlotController } from '@vaadin/component-base/src/slot-controller.js';
import {
dateAfterXMonths,
dateAllowed,
dateEquals,
extractDateParts,
getClosestDate,
} from './vaadin-date-picker-helper.js';
/**
* @polymerMixin
*/
export const DatePickerOverlayContentMixin = (superClass) =>
class DatePickerOverlayContentMixin extends superClass {
static get properties() {
return {
scrollDuration: {
type: Number,
value: 300,
},
/**
* The value for this element.
*/
selectedDate: {
type: Object,
value: null,
sync: true,
},
/**
* Date value which is focused using keyboard.
*/
focusedDate: {
type: Object,
notify: true,
observer: '_focusedDateChanged',
sync: true,
},
_focusedMonthDate: Number,
/**
* Date which should be visible when there is no value selected.
*/
initialPosition: {
type: Object,
observer: '_initialPositionChanged',
},
_originDate: {
type: Object,
value: new Date(),
},
_visibleMonthIndex: Number,
_desktopMode: {
type: Boolean,
observer: '_desktopModeChanged',
},
_desktopMediaQuery: {
type: String,
value: '(min-width: 375px)',
},
_translateX: {
observer: '_translateXChanged',
},
_yearScrollerWidth: {
value: 50,
},
i18n: {
type: Object,
},
showWeekNumbers: {
type: Boolean,
value: false,
},
_ignoreTaps: Boolean,
_notTapping: Boolean,
/**
* The earliest date that can be selected. All earlier dates will be disabled.
*/
minDate: {
type: Object,
sync: true,
},
/**
* The latest date that can be selected. All later dates will be disabled.
*/
maxDate: {
type: Object,
sync: true,
},
/**
* A function to be used to determine whether the user can select a given date.
* Receives a `DatePickerDate` object of the date to be selected and should return a
* boolean.
*
* @type {function(DatePickerDate): boolean | undefined}
*/
isDateDisabled: {
type: Function,
},
/**
* Input label
*/
label: String,
_cancelButton: {
type: Object,
},
_todayButton: {
type: Object,
},
calendars: {
type: Array,
value: () => [],
},
years: {
type: Array,
value: () => [],
},
};
}
static get observers() {
return [
'__updateCalendars(calendars, i18n, minDate, maxDate, selectedDate, focusedDate, showWeekNumbers, _ignoreTaps, _theme, isDateDisabled)',
'__updateCancelButton(_cancelButton, i18n)',
'__updateTodayButton(_todayButton, i18n, minDate, maxDate, isDateDisabled)',
'__updateYears(years, selectedDate, _theme)',
];
}
/**
* Whether to scroll to a sub-month position when scrolling to a date.
* This is active if the month scroller is not large enough to fit a
* full month. In that case we want to scroll to a position between
* two months in order to have the focused date in the visible area.
* @returns {boolean} whether to use sub-month scrolling
* @private
*/
get __useSubMonthScrolling() {
return this._monthScroller.clientHeight < this._monthScroller.itemHeight + this._monthScroller.bufferOffset;
}
get focusableDateElement() {
return this.calendars.map((calendar) => calendar.focusableDateElement).find(Boolean);
}
/** @protected */
_addListeners() {
setTouchAction(this.$.scrollers, 'pan-y');
addListener(this.$.scrollers, 'track', this._track.bind(this));
addListener(this.shadowRoot.querySelector('[part="clear-button"]'), 'tap', this._clear.bind(this));
addListener(this.shadowRoot.querySelector('[part="toggle-button"]'), 'tap', this._cancel.bind(this));
addListener(
this.shadowRoot.querySelector('[part="years-toggle-button"]'),
'tap',
this._toggleYearScroller.bind(this),
);
}
/** @protected */
_initControllers() {
this.addController(
new MediaQueryController(this._desktopMediaQuery, (matches) => {
this._desktopMode = matches;
}),
);
this.addController(
new SlotController(this, 'today-button', 'vaadin-button', {
observe: false,
initializer: (btn) => {
btn.setAttribute('theme', 'tertiary');
btn.addEventListener('keydown', (e) => this.__onTodayButtonKeyDown(e));
addListener(btn, 'tap', this._onTodayTap.bind(this));
this._todayButton = btn;
},
}),
);
this.addController(
new SlotController(this, 'cancel-button', 'vaadin-button', {
observe: false,
initializer: (btn) => {
btn.setAttribute('theme', 'tertiary');
btn.addEventListener('keydown', (e) => this.__onCancelButtonKeyDown(e));
addListener(btn, 'tap', this._cancel.bind(this));
this._cancelButton = btn;
},
}),
);
this.__initMonthScroller();
this.__initYearScroller();
}
reset() {
this._closeYearScroller();
this._toggleAnimateClass(true);
}
/**
* Focuses the cancel button
*/
focusCancel() {
this._cancelButton.focus();
}
/**
* Scrolls the list to the given Date.
*/
scrollToDate(date, animate) {
const offset = this.__useSubMonthScrolling ? this._calculateWeekScrollOffset(date) : 0;
this._scrollToPosition(this._differenceInMonths(date, this._originDate) + offset, animate);
this._monthScroller.forceUpdate();
}
/** @private */
__initMonthScroller() {
this.addController(
new SlotController(this, 'months', 'vaadin-date-picker-month-scroller', {
observe: false,
initializer: (scroller) => {
scroller.addEventListener('custom-scroll', () => {
this._onMonthScroll();
});
scroller.addEventListener('touchstart', () => {
this._onMonthScrollTouchStart();
});
scroller.addEventListener('keydown', (e) => {
this.__onMonthCalendarKeyDown(e);
});
scroller.addEventListener('init-done', () => {
const calendars = [...this.querySelectorAll('vaadin-month-calendar')];
// Two-way binding for selectedDate property
calendars.forEach((calendar) => {
calendar.addEventListener('selected-date-changed', (e) => {
this.selectedDate = e.detail.value;
});
});
this.calendars = calendars;
});
this._monthScroller = scroller;
},
}),
);
}
/** @private */
__initYearScroller() {
this.addController(
new SlotController(this, 'years', 'vaadin-date-picker-year-scroller', {
observe: false,
initializer: (scroller) => {
scroller.setAttribute('aria-hidden', 'true');
addListener(scroller, 'tap', (e) => {
this._onYearTap(e);
});
scroller.addEventListener('custom-scroll', () => {
this._onYearScroll();
});
scroller.addEventListener('touchstart', () => {
this._onYearScrollTouchStart();
});
scroller.addEventListener('init-done', () => {
this.years = [...this.querySelectorAll('vaadin-date-picker-year')];
});
this._yearScroller = scroller;
},
}),
);
}
/** @private */
__updateCancelButton(cancelButton, i18n) {
if (cancelButton) {
cancelButton.textContent = i18n && i18n.cancel;
}
}
/** @private */
__updateTodayButton(todayButton, i18n, minDate, maxDate, isDateDisabled) {
if (todayButton) {
todayButton.textContent = i18n && i18n.today;
todayButton.disabled = !this._isTodayAllowed(minDate, maxDate, isDateDisabled);
}
}
// eslint-disable-next-line @typescript-eslint/max-params
__updateCalendars(
calendars,
i18n,
minDate,
maxDate,
selectedDate,
focusedDate,
showWeekNumbers,
ignoreTaps,
theme,
isDateDisabled,
) {
if (calendars && calendars.length) {
calendars.forEach((calendar) => {
calendar.i18n = i18n;
calendar.minDate = minDate;
calendar.maxDate = maxDate;
calendar.isDateDisabled = isDateDisabled;
calendar.focusedDate = focusedDate;
calendar.selectedDate = selectedDate;
calendar.showWeekNumbers = showWeekNumbers;
calendar.ignoreTaps = ignoreTaps;
if (theme) {
calendar.setAttribute('theme', theme);
} else {
calendar.removeAttribute('theme');
}
});
}
}
/** @private */
__updateYears(years, selectedDate, theme) {
if (years && years.length) {
years.forEach((year) => {
year.selectedDate = selectedDate;
if (theme) {
year.setAttribute('theme', theme);
} else {
year.removeAttribute('theme');
}
});
}
}
/**
* Select a date and fire event indicating user interaction.
* @protected
*/
_selectDate(dateToSelect) {
if (!this._dateAllowed(dateToSelect)) {
return false;
}
this.selectedDate = dateToSelect;
this.dispatchEvent(
new CustomEvent('date-selected', { detail: { date: dateToSelect }, bubbles: true, composed: true }),
);
return true;
}
/** @private */
_desktopModeChanged(desktopMode) {
this.toggleAttribute('desktop', desktopMode);
}
/** @private */
_focusedDateChanged(focusedDate) {
this.revealDate(focusedDate);
}
/**
* Scrolls the month and year scrollers enough to reveal the given date.
*/
revealDate(date, animate = true) {
if (!date) {
return;
}
const diff = this._differenceInMonths(date, this._originDate);
// If scroll area does not fit the full month, then always scroll with an offset to
// approximately display the week of the date
if (this.__useSubMonthScrolling) {
const offset = this._calculateWeekScrollOffset(date);
this._scrollToPosition(diff + offset, animate);
return;
}
// Otherwise determine if we need to scroll to make the month of the date visible
const scrolledAboveViewport = this._monthScroller.position > diff;
const visibleArea = Math.max(
this._monthScroller.itemHeight,
this._monthScroller.clientHeight - this._monthScroller.bufferOffset * 2,
);
const visibleItems = visibleArea / this._monthScroller.itemHeight;
const scrolledBelowViewport = this._monthScroller.position + visibleItems - 1 < diff;
if (scrolledAboveViewport) {
this._scrollToPosition(diff, animate);
} else if (scrolledBelowViewport) {
this._scrollToPosition(diff - visibleItems + 1, animate);
}
}
/**
* Calculates an offset to be added to the month scroll position
* when using sub-month scrolling, in order ensure that the week
* that the date is in is visible even for small scroll areas.
* As the month scroller uses a month as minimal scroll unit
* (a value of `1` equals one month), we can not exactly identify
* the position of a specific week. This is a best effort
* implementation based on manual testing.
* @param date the date for which to calculate the offset
* @returns {number} the offset
* @private
*/
_calculateWeekScrollOffset(date) {
// Get first day of month
const temp = new Date(0, 0);
temp.setFullYear(date.getFullYear());
temp.setMonth(date.getMonth());
temp.setDate(1);
// Determine week (=row index) of date within the month
let week = 0;
while (temp.getDate() < date.getDate()) {
temp.setDate(temp.getDate() + 1);
if (temp.getDay() === this.i18n.firstDayOfWeek) {
week += 1;
}
}
// Calculate magic number that approximately keeps the week visible
return week / 6;
}
/** @private */
_initialPositionChanged(initialPosition) {
if (this._monthScroller && this._yearScroller) {
this._monthScroller.active = true;
this._yearScroller.active = true;
}
this.scrollToDate(initialPosition);
}
/** @private */
_repositionYearScroller() {
const monthPosition = this._monthScroller.position;
this._visibleMonthIndex = Math.floor(monthPosition);
this._yearScroller.position = (monthPosition + this._originDate.getMonth()) / 12;
}
/** @private */
_repositionMonthScroller() {
this._monthScroller.position = this._yearScroller.position * 12 - this._originDate.getMonth();
this._visibleMonthIndex = Math.floor(this._monthScroller.position);
}
/** @private */
_onMonthScroll() {
this._repositionYearScroller();
this._doIgnoreTaps();
}
/** @private */
_onYearScroll() {
this._repositionMonthScroller();
this._doIgnoreTaps();
}
/** @private */
_onYearScrollTouchStart() {
this._notTapping = false;
setTimeout(() => {
this._notTapping = true;
}, 300);
this._repositionMonthScroller();
}
/** @private */
_onMonthScrollTouchStart() {
this._repositionYearScroller();
}
/** @private */
_doIgnoreTaps() {
this._ignoreTaps = true;
this._debouncer = Debouncer.debounce(this._debouncer, timeOut.after(300), () => {
this._ignoreTaps = false;
});
}
/** @protected */
_formatDisplayed(date, i18n, label) {
if (date && i18n && typeof i18n.formatDate === 'function') {
return i18n.formatDate(extractDateParts(date));
}
return label;
}
/** @private */
_onTodayTap() {
const today = this._getTodayMidnight();
if (Math.abs(this._monthScroller.position - this._differenceInMonths(today, this._originDate)) < 0.001) {
// Select today only if the month scroller is positioned approximately
// at the beginning of the current month
this._selectDate(today);
this._close();
} else {
this._scrollToCurrentMonth();
}
}
/** @private */
_scrollToCurrentMonth() {
if (this.focusedDate) {
this.focusedDate = new Date();
}
this.scrollToDate(new Date(), true);
}
/** @private */
_onYearTap(e) {
if (!this._ignoreTaps && !this._notTapping) {
const scrollDelta =
e.detail.y - (this._yearScroller.getBoundingClientRect().top + this._yearScroller.clientHeight / 2);
const yearDelta = scrollDelta / this._yearScroller.itemHeight;
this._scrollToPosition(this._monthScroller.position + yearDelta * 12, true);
}
}
/** @private */
_scrollToPosition(targetPosition, animate) {
if (this._targetPosition !== undefined) {
this._targetPosition = targetPosition;
return;
}
if (!animate) {
this._monthScroller.position = targetPosition;
this._targetPosition = undefined;
this._repositionYearScroller();
this.__tryFocusDate();
return;
}
this._targetPosition = targetPosition;
let revealResolve;
this._revealPromise = new Promise((resolve) => {
revealResolve = resolve;
});
// http://gizma.com/easing/
const easingFunction = (t, b, c, d) => {
t /= d / 2;
if (t < 1) {
return (c / 2) * t * t + b;
}
t -= 1;
return (-c / 2) * (t * (t - 2) - 1) + b;
};
let start = 0;
const initialPosition = this._monthScroller.position;
const smoothScroll = (timestamp) => {
if (!start) {
start = timestamp;
}
const currentTime = timestamp - start;
if (currentTime < this.scrollDuration) {
const currentPos = easingFunction(
currentTime,
initialPosition,
this._targetPosition - initialPosition,
this.scrollDuration,
);
this._monthScroller.position = currentPos;
window.requestAnimationFrame(smoothScroll);
} else {
this.dispatchEvent(
new CustomEvent('scroll-animation-finished', {
bubbles: true,
composed: true,
detail: {
position: this._targetPosition,
oldPosition: initialPosition,
},
}),
);
this._monthScroller.position = this._targetPosition;
this._targetPosition = undefined;
revealResolve();
this._revealPromise = undefined;
}
setTimeout(this._repositionYearScroller.bind(this), 1);
};
// Start the animation.
window.requestAnimationFrame(smoothScroll);
}
/** @private */
_limit(value, range) {
return Math.min(range.max, Math.max(range.min, value));
}
/** @private */
_handleTrack(e) {
// Check if horizontal movement threshold (dx) not exceeded or
// scrolling fast vertically (ddy).
if (Math.abs(e.detail.dx) < 10 || Math.abs(e.detail.ddy) > 10) {
return;
}
// If we're flinging quickly -> start animating already.
if (Math.abs(e.detail.ddx) > this._yearScrollerWidth / 3) {
this._toggleAnimateClass(true);
}
const newTranslateX = this._translateX + e.detail.ddx;
this._translateX = this._limit(newTranslateX, {
min: 0,
max: this._yearScrollerWidth,
});
}
/** @private */
_track(e) {
if (this._desktopMode) {
// No need to track for swipe gestures on desktop.
return;
}
switch (e.detail.state) {
case 'start':
this._toggleAnimateClass(false);
break;
case 'track':
this._handleTrack(e);
break;
case 'end':
this._toggleAnimateClass(true);
if (this._translateX >= this._yearScrollerWidth / 2) {
this._closeYearScroller();
} else {
this._openYearScroller();
}
break;
default:
break;
}
}
/** @private */
_toggleAnimateClass(enable) {
if (enable) {
this.classList.add('animate');
} else {
this.classList.remove('animate');
}
}
/** @private */
_toggleYearScroller() {
if (this._isYearScrollerVisible()) {
this._closeYearScroller();
} else {
this._openYearScroller();
}
}
/** @private */
_openYearScroller() {
this._translateX = 0;
this.setAttribute('years-visible', '');
}
/** @private */
_closeYearScroller() {
this.removeAttribute('years-visible');
this._translateX = this._yearScrollerWidth;
}
/** @private */
_isYearScrollerVisible() {
return this._translateX < this._yearScrollerWidth / 2;
}
/** @private */
_translateXChanged(x) {
if (!this._desktopMode) {
this._monthScroller.style.transform = `translateX(${x - this._yearScrollerWidth}px)`;
this._yearScroller.style.transform = `translateX(${x}px)`;
}
}
/** @private */
_yearAfterXMonths(months) {
return dateAfterXMonths(months).getFullYear();
}
/** @private */
_differenceInMonths(date1, date2) {
const months = (date1.getFullYear() - date2.getFullYear()) * 12;
return months - date2.getMonth() + date1.getMonth();
}
/** @private */
_clear() {
this._selectDate('');
}
/** @private */
_close() {
this.dispatchEvent(new CustomEvent('close', { bubbles: true, composed: true }));
}
/** @private */
_cancel() {
this.focusedDate = this.selectedDate;
this._close();
}
/** @protected */
_preventDefault(e) {
e.preventDefault();
}
/** @private */
__toggleDate(date) {
if (dateEquals(date, this.selectedDate)) {
this._clear();
this.focusedDate = date;
} else {
this._selectDate(date);
}
}
/** @private */
__onMonthCalendarKeyDown(event) {
let handled = false;
switch (event.key) {
case 'ArrowDown':
this._moveFocusByDays(7);
handled = true;
break;
case 'ArrowUp':
this._moveFocusByDays(-7);
handled = true;
break;
case 'ArrowRight':
this._moveFocusByDays(this.__isRTL ? -1 : 1);
handled = true;
break;
case 'ArrowLeft':
this._moveFocusByDays(this.__isRTL ? 1 : -1);
handled = true;
break;
case 'Enter':
if (this._selectDate(this.focusedDate)) {
this._close();
handled = true;
}
break;
case ' ':
this.__toggleDate(this.focusedDate);
handled = true;
break;
case 'Home':
this._moveFocusInsideMonth(this.focusedDate, 'minDate');
handled = true;
break;
case 'End':
this._moveFocusInsideMonth(this.focusedDate, 'maxDate');
handled = true;
break;
case 'PageDown':
this._moveFocusByMonths(event.shiftKey ? 12 : 1);
handled = true;
break;
case 'PageUp':
this._moveFocusByMonths(event.shiftKey ? -12 : -1);
handled = true;
break;
case 'Tab':
this._onTabKeyDown(event, 'calendar');
break;
default:
break;
}
if (handled) {
event.preventDefault();
event.stopPropagation();
}
}
/** @private */
_onTabKeyDown(event, section) {
// Stop propagation to avoid focus-trap
// listener when used in a modal dialog.
event.stopPropagation();
switch (section) {
case 'calendar':
if (event.shiftKey) {
event.preventDefault();
if (this.hasAttribute('fullscreen')) {
// Trap focus in the overlay
this.focusCancel();
} else {
this.__focusInput();
}
}
break;
case 'today':
if (event.shiftKey) {
event.preventDefault();
this.focusDateElement();
}
break;
case 'cancel':
if (!event.shiftKey) {
event.preventDefault();
if (this.hasAttribute('fullscreen')) {
// Trap focus in the overlay
this.focusDateElement();
} else {
this.__focusInput();
}
}
break;
default:
break;
}
}
/** @private */
__onTodayButtonKeyDown(event) {
if (event.key === 'Tab') {
this._onTabKeyDown(event, 'today');
}
}
/** @private */
__onCancelButtonKeyDown(event) {
if (event.key === 'Tab') {
this._onTabKeyDown(event, 'cancel');
}
}
/** @private */
__focusInput() {
this.dispatchEvent(new CustomEvent('focus-input', { bubbles: true, composed: true }));
}
/** @private */
__tryFocusDate() {
const dateToFocus = this.__pendingDateFocus;
if (dateToFocus) {
// Check the date element with tabindex="0"
const dateElement = this.focusableDateElement;
if (dateElement && dateEquals(dateElement.date, this.__pendingDateFocus)) {
delete this.__pendingDateFocus;
dateElement.focus();
}
}
}
async focusDate(date, keepMonth) {
const dateToFocus = date || this.selectedDate || this.initialPosition || new Date();
this.focusedDate = dateToFocus;
if (!keepMonth) {
this._focusedMonthDate = dateToFocus.getDate();
}
await this.focusDateElement(false);
}
async focusDateElement(reveal = true) {
this.__pendingDateFocus = this.focusedDate;
// Wait for `vaadin-month-calendar` elements to be rendered
if (!this.calendars.length) {
await new Promise((resolve) => {
afterNextRender(this, () => {
// Force dom-repeat elements to render
flush();
resolve();
});
});
}
// Reveal focused date unless it has been just set,
// which triggers `revealDate()` in the observer.
if (reveal) {
this.revealDate(this.focusedDate);
}
if (this._revealPromise) {
// Wait for focused date to be scrolled into view.
await this._revealPromise;
}
this.__tryFocusDate();
}
/** @private */
_focusClosestDate(focus) {
this.focusDate(getClosestDate(focus, [this.minDate, this.maxDate]));
}
/** @private */
_focusAllowedDate(dateToFocus, diff, keepMonth) {
// For this check we do consider the isDateDisabled function because disabled dates are allowed to be focused, just not outside min/max
if (this._dateAllowed(dateToFocus, undefined, undefined, () => false)) {
this.focusDate(dateToFocus, keepMonth);
} else if (this._dateAllowed(this.focusedDate)) {
// Move to min or max date
if (diff > 0) {
// Down, Right or Page Down key
this.focusDate(this.maxDate);
} else {
// Up, Left or Page Up key
this.focusDate(this.minDate);
}
} else {
// Move to closest allowed date
this._focusClosestDate(this.focusedDate);
}
}
/** @private */
_getDateDiff(months, days) {
const date = new Date(0, 0);
date.setFullYear(this.focusedDate.getFullYear());
date.setMonth(this.focusedDate.getMonth() + months);
if (days) {
date.setDate(this.focusedDate.getDate() + days);
}
return date;
}
/** @private */
_moveFocusByDays(days) {
const dateToFocus = this._getDateDiff(0, days);
this._focusAllowedDate(dateToFocus, days, false);
}
/** @private */
_moveFocusByMonths(months) {
const dateToFocus = this._getDateDiff(months);
const targetMonth = dateToFocus.getMonth();
if (!this._focusedMonthDate) {
this._focusedMonthDate = this.focusedDate.getDate();
}
dateToFocus.setDate(this._focusedMonthDate);
if (dateToFocus.getMonth() !== targetMonth) {
dateToFocus.setDate(0);
}
this._focusAllowedDate(dateToFocus, months, true);
}
/** @private */
_moveFocusInsideMonth(focusedDate, property) {
const dateToFocus = new Date(0, 0);
dateToFocus.setFullYear(focusedDate.getFullYear());
if (property === 'minDate') {
dateToFocus.setMonth(focusedDate.getMonth());
dateToFocus.setDate(1);
} else {
dateToFocus.setMonth(focusedDate.getMonth() + 1);
dateToFocus.setDate(0);
}
if (this._dateAllowed(dateToFocus)) {
this.focusDate(dateToFocus);
} else if (this._dateAllowed(focusedDate)) {
// Move to minDate or maxDate
this.focusDate(this[property]);
} else {
// Move to closest allowed date
this._focusClosestDate(focusedDate);
}
}
/** @private */
_dateAllowed(date, min = this.minDate, max = this.maxDate, isDateDisabled = this.isDateDisabled) {
return dateAllowed(date, min, max, isDateDisabled);
}
/** @private */
_isTodayAllowed(min, max, isDateDisabled) {
return this._dateAllowed(this._getTodayMidnight(), min, max, isDateDisabled);
}
/** @private */
_getTodayMidnight() {
const today = new Date();
const todayMidnight = new Date(0, 0);
todayMidnight.setFullYear(today.getFullYear());
todayMidnight.setMonth(today.getMonth());
todayMidnight.setDate(today.getDate());
return todayMidnight;
}
/**
* Fired when the scroller reaches the target scrolling position.
* @event scroll-animation-finished
* @param {Number} detail.position new position
* @param {Number} detail.oldPosition old position
*/
};
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