Ugui滑動翻頁

 

using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
{
    #region 數據申明

    private ScrollRect scrollRect;
    public int totalObjectCount { get; private set; }
    public int totalPageNumber { get; private set; }
    public int onePageObjectCount = 1;
    public float smooting = 4;
    private float targethorizontal = 0;
    private bool isDrag = false;
    private float spacing;
    public int currentPage { get; private set; }
    private float beginPs;
    private float endPs;

    public event Action<int> onChagePage = null;

    #endregion

    #region Unity函數

    private void Awake()
    {
        scrollRect = transform.GetComponent<ScrollRect>();

        int count = 0;
        foreach (Transform tf in scrollRect.content) { if (tf.gameObject.activeInHierarchy) count++; }
        SetItemCount(count);
    }

    private void OnEnable()
    {
        scrollRect.horizontalNormalizedPosition = 0;
    }

    private void Update()
    {
        if (isDrag) return;
        scrollRect.horizontalNormalizedPosition = Mathf.Lerp(scrollRect.horizontalNormalizedPosition, targethorizontal, Time.deltaTime * smooting);
    }

    #endregion

    #region 公開函數

    /// <summary>手動設置Item數量</summary>
    public void SetItemCount(int Count)
    {
        totalObjectCount = Count;
        totalPageNumber = (totalObjectCount / onePageObjectCount);
        if ((totalObjectCount % onePageObjectCount) != 0) totalPageNumber++;
        spacing = 1f / (totalObjectCount - onePageObjectCount);
    }

    /// <summary>設置頁碼</summary>
    public void SetPage(int page)
    {
        int temp = Mathf.Clamp(page - 1, 0, totalPageNumber - 1);
        targethorizontal = (spacing * onePageObjectCount) * temp;
        currentPage = page;
        if (onChagePage != null) onChagePage(page);
    }

    /// <summary>拖動開始</summary>
    public void OnBeginDrag(PointerEventData eventData)
    {
        isDrag = true;
        beginPs = Input.mousePosition.x;
    }

    /// <summary>拖拽結束</summary>
    public void OnEndDrag(PointerEventData eventData)
    {
        isDrag = false;

        int page = currentPage;

        endPs = Input.mousePosition.x;
        float offset = Math.Abs(endPs - beginPs);

        if(offset>30)
        {
            if (endPs < beginPs) page++;
            else page--;

            page = Mathf.Clamp((int)page, 1, totalPageNumber);
            SetPage(page);
        }
    }

    #endregion

}

 

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