unity,ngui做聊天系统

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class CUIChatScrollView : UIScrollView
{

    public delegate void OnMoveCallBack();
    /// <summary>
    /// 每次滑动结束的回调
    /// </summary>
    public OnMoveCallBack mOnMoveCallback;

    public delegate void OnMoveNextPage(int pageindex);
    public OnMoveNextPage mOnMoveNextPage;

    private float mTopOffSetValue = 250;
    private float mBottomOffSetValue = 250;
    /// <summary>
    /// 当前数据总数
    /// </summary>
    private int mTotalCount = 0;
    /// <summary>
    /// 子物体当前临时坐标
    /// </summary>
    private float mTempPosition = 0;
    /// <summary>
    /// 子物体当前临时相对坐标(与UIPanel偏移、DynamicComponentTran、自己本身坐标之和,如果UIpanel裁剪区域有偏移还需要加上UIPanel FinalClipRegion的偏移值（X或者Y））
    /// </summary>
    private float mBorderValue = 0;
    /// <summary>
    /// 当前显示出来的物体列表
    /// </summary>
    private List<CBaseComponent> mCurrentComList = new List<CBaseComponent>();
    /// <summary>
    /// 当前循环临时加载的列表（达到临界值需要移动的Components）
    /// </summary>
    private List<CBaseComponent> mTempComList = new List<CBaseComponent>();
    /// <summary>
    ///  挂载UIGrid的组件物体，是components父物体，UIPanel子物体
    /// </summary>
    private Transform DynamicComponentTran;
    /// <summary>
    /// 当前ScrollView依赖的UIPanel
    /// </summary>
    private UIPanel mUIPanel;
    /// <summary>
    /// UIPanel最终的绘制区域、坐标
    /// </summary>
    private Vector4 mPanelFinalClipRegion;
    /// <summary>
    /// 是否需要请求下一页数据（用于多数据分页加载情况）
    /// </summary>
    private bool bNeedReqNextPage;
    /// <summary>
    /// 每页的数量(用于分页)
    /// </summary>
    private int mPrePageNumber;
    /// <summary>
    /// 是否是排行榜模式
    /// </summary>
    private bool bIsRankModel;
    /// <summary>
    /// 当前自己的排名
    /// </summary>
    private int mCurrentMyRank;
    /// <summary>
    /// 缓存开关
    /// </summary>
    private Dictionary<int, bool> bHasRequestDic = new Dictionary<int, bool>();
    /// <summary>
    /// 用于比较的X坐标
    /// </summary>
    private float xPos;
    /// <summary>
    /// 用于比较的Y坐标
    /// </summary>
    private float yPos;
    /// <summary>
    /// 是否需要3D显示效果
    /// </summary>
    private bool bShow3DStyle = false;
    /// <summary>
    /// 居中的子物体
    /// </summary>
    public Transform mCenterTranform;
    /// <summary>
    /// 子物体的depath
    /// </summary>
    private UIPanel mTempUIPanel;
    /// <summary>
    ///  ScrollView 的UIPanel depath。
    /// </summary>
    private int mUIPanelDepth = 1;

    private int m_Index = 0;
    private int m_maxShowNum = 0;

    public void Init<T>(List<T> components, int maxShowNum, int totalNumber, Transform dyTransorm, Movement moveMent = Movement.Horizontal, bool needrequest = false, int prepagenum = 0, bool isrank = false, int myrank = 0, bool bshow3d = false) where T : CBaseComponent
    {
        m_Index = maxShowNum-1;
        m_maxShowNum = maxShowNum;
        mCurrentComList.Clear();
        for (int i = 0, length = components.Count; i < length; i++)
        {
            if (components[i] is CBaseComponent)
            {
                mCurrentComList.Add(components[i]);
            }
        }
        //mCurrentComList = components as List<CBaseComponent>;
        DynamicComponentTran = dyTransorm;
        mTotalCount = totalNumber;
        movement = moveMent;
        mPanelFinalClipRegion = (mUIPanel ?? (mUIPanel = gameObject.GetComponent<UIPanel>())).finalClipRegion;
        mUIPanelDepth = mUIPanel.depth + 10;//子物体固定高出父物体深度10个单位
        //if (movement == Movement.Vertical)
        //    mOffSetValue = mPanelFinalClipRegion.w / 2 + mItemIntervalValue / 2f;
        //else if (moveMent == Movement.Horizontal)
        //    mOffSetValue = mPanelFinalClipRegion.z / 2 + mItemIntervalValue / 2f;
        bNeedReqNextPage = needrequest;
        mPrePageNumber = prepagenum;
        bIsRankModel = isrank;
        mCurrentMyRank = myrank;
        bHasRequestDic.Clear();
        bShow3DStyle = bshow3d;
        momentumAmount = 35f;
    }

    public override void MoveRelative(Vector3 relative)
    {
        base.MoveRelative(relative);
        CheckScrollView(relative);
    }

    public override void AdjustSpring(Vector3 relative)
    {
        base.AdjustSpring(relative);
        CheckScrollView(relative);
    }

    private void CheckScrollView(Vector3 relative)
    {
        if (mCurrentComList == null || mCurrentComList.Count == 0)
            return;

        if (movement == Movement.Horizontal)
        {
            xPos = relative.x;
            mCurrentComList.Sort(delegate (CBaseComponent a, CBaseComponent b) { return a.LocalPosition.x.CompareTo(b.LocalPosition.x); });
        }
        else if (movement == Movement.Vertical)
        {
            yPos = relative.y;
            mCurrentComList.Sort(delegate (CBaseComponent a, CBaseComponent b) { return b.LocalPosition.y.CompareTo(a.LocalPosition.y); });
        }

        mTempComList.Clear();

        if ((yPos > 0 && movement == Movement.Vertical) || (xPos < 0 && movement == Movement.Horizontal))
        {
            Transform temptran = mCurrentComList[mCurrentComList.Count - 1].ComTransform;
            if (movement == Movement.Horizontal)
                mTempPosition = temptran.localPosition.x;
            else if (movement == Movement.Vertical)
                mTempPosition = temptran.localPosition.y;
            mTempPosition = Mathf.Abs(mTempPosition);

            if (true)
            {
                for (int i = 0, j = mCurrentComList.Count; i < j; i++)
                {
                    temptran = mCurrentComList[i].ComTransform;
                    if (movement == Movement.Horizontal)
                    {
                        mBorderValue = (temptran.localPosition.x*temptran.localScale.x + transform.localPosition.x + DynamicComponentTran.localPosition.x + Mathf.Abs(mPanelFinalClipRegion.x));
                        if (mBorderValue > -mTopOffSetValue)
                        {
                            break;
                        }
                    }
                    else if (movement == Movement.Vertical)
                    {
                        mBorderValue = (temptran.localPosition.y * temptran.localScale.y + transform.localPosition.y + DynamicComponentTran.localPosition.y + Mathf.Abs(mPanelFinalClipRegion.y));
                        if (mBorderValue < mTopOffSetValue)
                        {
                            break;
                        }
                    }
                    mTempComList.Add(mCurrentComList[i]);

                }
            }
            for (int i = 0, j = mTempComList.Count; i < j; i++)
            {
                if (m_Index >= mTotalCount - 1) break;
                m_Index++;
                if (movement == Movement.Vertical)
                {
                    float spriteHeight = NGUIMath.CalculateRelativeWidgetBounds(transform, mCurrentComList[mCurrentComList.Count - 1].ComTransform, true).size.y;
                    mTempComList[i].LocalPosition = new Vector3(0, -(spriteHeight +mTempPosition), 0);
                }
                //mTempComList[i].LocalPosition = new Vector3(0, -(mItemIntervalValue * (i + 1) + mTempPosition), 0);
                mTempComList[i].InitData(m_Index);
            }
        }
        else if ((yPos < 0 && movement == Movement.Vertical) || (xPos > 0 && movement == Movement.Horizontal))
        {
            Transform temptran = mCurrentComList[0].ComTransform;
            if (movement == Movement.Horizontal)
                mTempPosition = temptran.localPosition.x;
            else if (movement == Movement.Vertical)
                mTempPosition = temptran.localPosition.y;
            mTempPosition = Mathf.Abs(mTempPosition);

            if (true)
            {
                for (int i = mCurrentComList.Count - 1; i >= 0; i--)
                {
                    temptran = mCurrentComList[i].ComTransform;
                    if (movement == Movement.Horizontal)
                    {
                        mBorderValue = (temptran.localPosition.x + transform.localPosition.x + DynamicComponentTran.localPosition.x + Mathf.Abs(mPanelFinalClipRegion.x));
                        if (mBorderValue <mBottomOffSetValue)
                        {
                            break;
                        }
                    }
                    else if (movement == Movement.Vertical)
                    {
                        mBorderValue = (temptran.localPosition.y + transform.localPosition.y + DynamicComponentTran.localPosition.y + Mathf.Abs(mPanelFinalClipRegion.y));
                        if (mBorderValue > -mBottomOffSetValue)
                        {
                            break;
                        }
                    }
                    mTempComList.Add(mCurrentComList[i]);
                }
            }
            for (int i = 0, j = mTempComList.Count; i < j; i++)
            {
                if (m_Index <= m_maxShowNum-1) break;

                m_Index--;

                //mTempComList[i].LocalPosition = new Vector3(0, -(mTempPosition - mItemIntervalValue * (i + 1)), 0);
                mTempComList[i].InitData(m_Index - m_maxShowNum+1);

                if (movement == Movement.Vertical)
                {
                    float spriteHeight = NGUIMath.CalculateRelativeWidgetBounds(transform, mTempComList[i].ComTransform, true).size.y;
                    Vector3 newPosition;
                    if (i == 0)
                        newPosition = new Vector3(0, -(mTempPosition - spriteHeight), 0);
                    else
                        newPosition = new Vector3(0, -(Mathf.Abs(mTempComList[i - 1].LocalPosition.y) - spriteHeight), 0);
                    mTempComList[i].LocalPosition = newPosition;
                }
            }
        }
        if (mOnMoveCallback != null)
        {
            mOnMoveCallback();
        }
    }


}