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Assets/Scripts/PGD/UI_Calendar.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using TMPro;
+using Unity.VisualScripting;
+using UnityEngine;
+using UnityEngine.UI;
+using WI;
+
+public class UI_Calendar : UIBase
+{
+    public List<UI_CalendarItem> calendarItemList = new List<UI_CalendarItem>();
+    public GameObject prefab_calendarItem;
+    public RectTransform Text_Sunday;
+    public RectTransform Text_Monday;
+    public RectTransform ItemRoot;
+    public TextMeshProUGUI Text_Day;
+    public Button Button_PrevMonth;
+    public Button Button_NextMonth;
+   
+    private const int totalItemNum = 42;
+
+    private DateTime originDateTime;
+    private DateTime curDateTime;
+
+    private TextMeshProUGUI targetText;
+
+    public override void AfterAwake()
+    {
+        Button_PrevMonth.onClick.AddListener(OnClickPrevMonth);
+        Button_NextMonth.onClick.AddListener(OnClickNextMonth);
+
+        prefab_calendarItem = Resources.Load<GameObject>("Prefabs/UI/PRF_UI_CalendarItem");
+        float sundayPosX = Text_Sunday.anchoredPosition.x;
+        float mondayPosX = Text_Monday.anchoredPosition.x;
+        float space = mondayPosX - sundayPosX;
+        Vector2 prefabSize = prefab_calendarItem.GetComponent<RectTransform>().sizeDelta;
+        Vector2 itemStartPos = new Vector2(Text_Sunday.anchoredPosition.x, Text_Sunday.anchoredPosition.y - space);
+
+        for (int i = 0; i < totalItemNum; i++)
+        {
+            UI_CalendarItem item = Instantiate(prefab_calendarItem.gameObject, ItemRoot).GetComponent<UI_CalendarItem>();
+            item.onClickEvent += OnClickItem;
+            item.GetComponent<RectTransform>().anchoredPosition = new Vector3((i % 7) * space + itemStartPos.x, itemStartPos.y - (i / 7) * space);
+            calendarItemList.Add(item);
+        }
+    }
+
+    public void Open(TextMeshProUGUI target)
+    {
+        targetText = target;
+        originDateTime = Convert.ToDateTime(targetText.text);
+        curDateTime = Convert.ToDateTime(targetText.text);
+        SetActive(true);
+        SetCalendar();
+    }
+
+    public void Close()
+    {
+        SetActive(false);
+    }
+
+    void SetCalendar()
+    {
+        DateTime firstDay = curDateTime.AddDays(-(curDateTime.Day - 1));
+        int weekIndex = (int)firstDay.DayOfWeek;
+        int curMonthDaysCount = DateTime.DaysInMonth(curDateTime.Year, curDateTime.Month);
+        DateTime lastMonth = firstDay.AddDays(-1);
+        int lastMonthDaysCount = DateTime.DaysInMonth(lastMonth.Year, lastMonth.Month);
+        DateTime today = DateTime.Today;
+
+        int date = 0;
+
+        for (int i = 0; i < totalItemNum; i++)
+        {
+            if (i >= weekIndex)
+            {
+                DateTime day = firstDay.AddDays(date);
+                if (day.Month == firstDay.Month) // ÇöÀç ´Þ
+                {
+                    calendarItemList[i].SetDate(day, Color.black);
+
+                    if (originDateTime.Date == day.Date)
+                    {
+                        calendarItemList[i].ShowSelectUI();
+                    }
+                    else if(today == day.Date)
+                    {
+                        calendarItemList[i].ShowTodayUI();
+                    }
+                }
+                else // ´ÙÀ½ ´Þ
+                {
+                    int nextMonthDay = date + 1 - curMonthDaysCount;
+                    DateTime nextMonthDate = new DateTime(day.Year, day.Month, nextMonthDay);
+                    calendarItemList[i].SetDate(nextMonthDate, Color.gray);
+
+                    if (today == nextMonthDate)
+                    {
+                        calendarItemList[i].ShowTodayUI();
+                    }
+                }
+
+                date++;
+            }
+            else // ÀÌÀü ´Þ
+            {
+                DateTime dayInLastMonth = new DateTime(lastMonth.Year, lastMonth.Month, lastMonthDaysCount - (weekIndex - i - 1));
+                calendarItemList[i].SetDate(dayInLastMonth, Color.gray);
+
+                if (today == dayInLastMonth)
+                {
+                    calendarItemList[i].ShowTodayUI();
+                }
+            }
+        }
+
+        Text_Day.text = $"{curDateTime.ToString("MMMM", new CultureInfo("en-US"))} {curDateTime.Year}";
+    }
+
+    private void OnClickItem(DateTime date)
+    {
+        targetText.text = date.ToString("yyyy-MM-dd");
+        Close();
+    }
+
+    private void OnClickPrevMonth()
+    {
+        curDateTime = curDateTime.AddMonths(-1);
+        SetCalendar();
+    }
+
+    private void OnClickNextMonth()
+    {
+        curDateTime = curDateTime.AddMonths(1);
+        SetCalendar();
+    }
+}

Assets/Scripts/PGD/UI_Calendar.cs.meta

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+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/PGD/UI_CalendarItem.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using TMPro;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+using WI;
+
+public class UI_CalendarItem : UIBase, IPointerEnterHandler, IPointerExitHandler, IPointerClickHandler
+{
+    DateTime targetDate;
+
+    public Action<DateTime> onClickEvent;
+    public Image HoverUI;
+    public Image SelectUI;
+    public Image TodayUI;
+    public TextMeshProUGUI Text_Day;
+
+    public void OnDisable()
+    {
+        Init();
+    }
+
+    private void Init()
+    {
+        HoverUI.gameObject.SetActive(false);
+        SelectUI.gameObject.SetActive(false);
+        TodayUI.gameObject.SetActive(false);
+        Text_Day.text = string.Empty;
+    }
+
+    public void SetDate(DateTime date, Color color)
+    {
+        Init();
+        targetDate = date;
+        Text_Day.text = date.Day.ToString();
+        Text_Day.color = color;
+    }
+
+    public void Close()
+    {
+        SetActive(false);
+    }
+
+    public void ShowSelectUI()
+    {
+        SelectUI.gameObject.SetActive(true);
+    }
+
+    public void ShowTodayUI()
+    {
+        TodayUI.gameObject.SetActive(true);
+    }
+
+    public void OnPointerClick(PointerEventData eventData)
+    {
+        onClickEvent?.Invoke(targetDate);
+    }
+
+    public void OnPointerEnter(PointerEventData eventData)
+    {
+        if (TodayUI.IsActive())
+            return;
+
+        HoverUI.gameObject.SetActive(true);
+    }
+
+    public void OnPointerExit(PointerEventData eventData)
+    {
+        HoverUI.gameObject.SetActive(false);
+    }
+}

Assets/Scripts/PGD/UI_CalendarItem.cs.meta

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