#760 fix date picker does not display on iphone

src/components/Menubar/components/DatePickerMobile.tsx

@@ -3,12 +3,15 @@ import { useTheme } from '@linagora/twake-mui'
 import { StaticDatePicker } from '@mui/x-date-pickers/StaticDatePicker'
 import { LocalizationProvider } from '@mui/x-date-pickers/LocalizationProvider'
 import { AdapterDayjs } from '@mui/x-date-pickers/AdapterDayjs'
-import React from 'react'
+import React, { useMemo } from 'react'
 import { useI18n } from 'twake-i18n'
 import dayjs from 'dayjs'
+import localeData from 'dayjs/plugin/localeData'
 import { PickerValue } from '@mui/x-date-pickers/internals'
 import { MonthSelector } from './MonthSelector'
 
+dayjs.extend(localeData)
+
 export type DatePickerMobileProps = {
   calendarRef: React.RefObject<CalendarApi | null>
   currentDate: Date
@@ -16,6 +19,59 @@ export type DatePickerMobileProps = {
   onCloseDatePicker: () => void
 }
 
+// Calculate dynamic height based on month's week count
+const calculateCalendarHeightByMonth = (
+  currentDate: Date,
+  lang: string
+): {
+  rootMinHeight: number
+  calendarHeight: number
+  slideTransitionMinHeight: number
+} => {
+  const date = dayjs(currentDate).locale(lang)
+  const firstDay = date.startOf('month')
+
+  const localeWeekStart = date.localeData().firstDayOfWeek()
+  const firstDayOfWeek = firstDay.day()
+
+  // Calculate days from start of month to first Sunday
+  // This determines how many days from previous month are shown
+  const daysFromPrevMonth = (firstDayOfWeek - localeWeekStart + 7) % 7
+
+  const daysInCurrentMonth = firstDay.daysInMonth()
+
+  // Total days displayed in calendar grid
+  const totalDaysDisplayed = daysFromPrevMonth + daysInCurrentMonth
+
+  // Calculate number of weeks needed (always round up to fill complete weeks)
+  const weekCount = Math.ceil(totalDaysDisplayed / 7)
+
+  // For showDaysOutsideCurrentMonth, most months will show 5-6 weeks
+  const adjustedWeekCount = Math.max(4, weekCount) // Minimum 4 weeks for consistency
+
+  // Base height per week + some padding
+  const baseHeightPerWeek = 50
+  const padding = 80
+  const minHeight = 200 // Minimum height for 4 weeks
+  const maxHeight = 400 // Maximum height for 6 weeks
+  const rootMinHeightOffset = 120
+  const slideTransitionOffset = 100
+
+  const calculatedHeight = Math.max(
+    minHeight,
+    Math.min(maxHeight, adjustedWeekCount * baseHeightPerWeek + padding)
+  )
+
+  return {
+    rootMinHeight: Math.max(minHeight, calculatedHeight - rootMinHeightOffset),
+    calendarHeight: calculatedHeight,
+    slideTransitionMinHeight: Math.max(
+      minHeight,
+      calculatedHeight - slideTransitionOffset
+    )
+  }
+}
+
 export const DatePickerMobile: React.FC<DatePickerMobileProps> = ({
   calendarRef,
   currentDate,
@@ -25,6 +81,11 @@ export const DatePickerMobile: React.FC<DatePickerMobileProps> = ({
   const { t, lang } = useI18n()
   const theme = useTheme()
 
+  const { rootMinHeight, calendarHeight, slideTransitionMinHeight } = useMemo(
+    () => calculateCalendarHeightByMonth(currentDate, lang ?? 'en'),
+    [currentDate, lang]
+  )
+
   const onChangeDate = (newDate: PickerValue): void => {
     if (newDate && calendarRef.current) {
       const d = newDate.toDate()
@@ -66,7 +127,8 @@ export const DatePickerMobile: React.FC<DatePickerMobileProps> = ({
         slots={{ calendarHeader: () => null, actionBar: () => null }}
         sx={{
           width: '100%',
-          marginTop: '10px'
+          marginTop: '10px',
+          minHeight: `${rootMinHeight}px`
         }}
         slotProps={{
           toolbar: { hidden: true },
@@ -75,9 +137,9 @@ export const DatePickerMobile: React.FC<DatePickerMobileProps> = ({
               '.MuiDateCalendar-root': {
                 width: '100%',
                 margin: 0,
-                maxWidth: 'unset',
-                maxHeight: 'unset',
-                height: '400px'
+                maxWidth: 'none',
+                maxHeight: 'none',
+                height: `${calendarHeight}px`
               },
               '.MuiDayCalendar-header': {
                 width: '100%',
@@ -86,6 +148,9 @@ export const DatePickerMobile: React.FC<DatePickerMobileProps> = ({
               '.MuiDayCalendar-weekContainer': {
                 width: '100%',
                 justifyContent: 'space-around'
+              },
+              '.MuiDateCalendar-root .MuiDayCalendar-slideTransition': {
+                minHeight: `${slideTransitionMinHeight}px`
               }
             }
           },

src/components/Menubar/components/MonthSelector.tsx

@@ -39,7 +39,8 @@ export const MonthSelector: React.FC<MonthSelectorProps> = ({
         py: 1,
         scrollbarWidth: 'none',
         '&::-webkit-scrollbar': { display: 'none' },
-        backgroundColor: '#FFF'
+        backgroundColor: '#FFF',
+        minHeight: '48px'
       }}
     >
       {Array.from({ length: 12 }).map((_, i) => {