using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
using UnityEngine;
///
/// 图片轮播组件
///
public class NewCarouselImage : UIBehaviour, IBeginDragHandler, IInitializePotentialDragHandler, IDragHandler, IEndDragHandler, ICanvasElement
{
///
/// 滚动方向H or V
///
public enum AxisType
{
Horizontal,
Vertical
}
///
/// 图片轮播方向
///
public enum LoopDirType
{
RightOrUp = -1,
LeftOrDown = 1,
}
///
/// 子物体size
///
public Vector2 mCellSize;
///
/// 子物体间隔
///
public Vector2 mSpacing;
///
/// 方向
///
public AxisType MMoveAxisType;
///
/// 轮播方向-- 1为向左移动，-1为向右移动
///
public LoopDirType mLoopDirType = LoopDirType.LeftOrDown;
///
/// Tween时的步数
///
[Range(1, 500)]
public int mTweenStepNum = 150;
///
/// 自动轮播
///
public bool mAutoLoop = false;
///
/// 可否拖动
///
public bool mDrag = false;
///
/// 下一次播放间隔时间
///
public float mLoopSpaceTime = 1;
///
/// 位于正中的子元素变化的事件,参数为index
///
[HideInInspector]
public Action mOnIndexChange;
///
/// 当前处于正中的元素
///
public int CurrentIndex
{
get
{
return m_index;
}
}
private bool m_Dragging = false;
private bool m_IsNormalizing = false;
private Vector2 m_CurrentPos;
private int m_currentStep = 0;
private RectTransform viewRectTran;
private Vector2 m_PrePos;
private int m_index = 0, m_preIndex = 0;
private RectTransform header;
private bool contentCheckCache = true;
private float currTimeDelta = 0;
private float viewRectXMin
{
get
{
Vector3[] v = new Vector3[4];
viewRectTran.GetWorldCorners(v);
return v[0].x;
}
}
private float viewRectXMax
{
get
{
Vector3[] v = new Vector3[4];
viewRectTran.GetWorldCorners(v);
return v[3].x;
}
}
private float viewRectYMin
{
get
{
Vector3[] v = new Vector3[4];
viewRectTran.GetWorldCorners(v);
return v[0].y;
}
}
private float viewRectYMax
{
get
{
Vector3[] v = new Vector3[4];
viewRectTran.GetWorldCorners(v);
return v[2].y;
}
}
public int CellCount
{
get
{
return transform.childCount;
}
}
protected override void Awake()
{
base.Awake();
viewRectTran = GetComponent();
header = GetChild(viewRectTran, 0);
}
public void resizeChildren()
{
Vector2 delta;
if (MMoveAxisType == AxisType.Horizontal)
{
delta = new Vector2(mCellSize.x + mSpacing.x, 0);
}
else
{
delta = new Vector2(0, mCellSize.y + mSpacing.y);
}
for (int i = 0; i < CellCount; i++)
{
var t = GetChild(viewRectTran, i);
if (t)
{
t.localPosition = delta * i;
t.sizeDelta = mCellSize;
}
}
m_IsNormalizing = false;
m_CurrentPos = Vector2.zero;
m_currentStep = 0;
}
///
/// 加子物体到当前列表的最后面
///
///
public virtual void AddChild(RectTransform t)
{
if (t != null)
{
t.SetParent(viewRectTran, false);
t.SetAsLastSibling();
Vector2 delta;
if (MMoveAxisType == AxisType.Horizontal)
{
delta = new Vector2(mCellSize.x + mSpacing.x, 0);
}
else
{
delta = new Vector2(0, mCellSize.y + mSpacing.y);
}
if (CellCount == 0)
{
t.localPosition = Vector3.zero;
header = t;
}
else
{
t.localPosition = delta + (Vector2)GetChild(viewRectTran, CellCount - 1).localPosition;
}
}
}
protected override void OnEnable()
{
base.OnEnable();
mOnIndexChange += OnChangeIndex;
resizeChildren();
return;
if (Application.isPlaying)
{
if (ContentIsLongerThanRect())
{
int s;
do
{
s = GetBoundaryState();
LoopCell(s);
} while (s != 0);
}
}
}
protected override void OnDisable()
{
base.OnDisable();
mOnIndexChange -= OnChangeIndex;
}
protected virtual void Update()
{
if (ContentIsLongerThanRect())
{
//实现在必要时loop子元素
if (Application.isPlaying)
{
int s = GetBoundaryState();
LoopCell(s);
}
//缓动回指定位置
if (m_IsNormalizing && EnsureListCanAdjust())
{
if (m_currentStep == mTweenStepNum)
{
m_IsNormalizing = false;
m_currentStep = 0;
m_CurrentPos = Vector2.zero;
return;
}
Vector2 delta = m_CurrentPos / mTweenStepNum;
m_currentStep++;
TweenToCorrect(-delta);
}
//自动loop
if (mAutoLoop && !m_IsNormalizing && EnsureListCanAdjust())
{
currTimeDelta += Time.deltaTime;
if (currTimeDelta > mLoopSpaceTime)
{
currTimeDelta = 0;
MoveToIndex(m_index + (int)mLoopDirType);
}
}
//检测index是否变化
if (MMoveAxisType == AxisType.Horizontal)
{
m_index = (int)(header.localPosition.x / (mCellSize.x + mSpacing.x - 1));
}
else
{
m_index = (int)(header.localPosition.y / (mCellSize.y + mSpacing.y - 1));
}
if (m_index <= 0)
{
m_index = Mathf.Abs(m_index);
}
else
{
m_index = CellCount - m_index;
}
if (m_index != m_preIndex)
{
if (mOnIndexChange != null)
{
mOnIndexChange(m_index);
}
}
m_preIndex = m_index;
}
}
public virtual void OnBeginDrag(PointerEventData eventData)
{
if (!mDrag || !contentCheckCache)
{
return;
}
Vector2 vector;
if (((eventData.button == PointerEventData.InputButton.Left) && this.IsActive()) && RectTransformUtility.ScreenPointToLocalPointInRectangle(this.viewRectTran, eventData.position, eventData.pressEventCamera, out vector))
{
this.m_Dragging = true;
m_PrePos = vector;
}
}
public virtual void OnInitializePotentialDrag(PointerEventData eventData)
{
if (!mDrag)
{
return;
}
return;
}
public virtual void OnDrag(PointerEventData eventData)
{
if (!mDrag || !contentCheckCache)
{
return;
}
Vector2 vector;
if (((eventData.button == PointerEventData.InputButton.Left) && this.IsActive()) && RectTransformUtility.ScreenPointToLocalPointInRectangle(this.viewRectTran, eventData.position, eventData.pressEventCamera, out vector))
{
m_IsNormalizing = false;
m_CurrentPos = Vector2.zero;
m_currentStep = 0;
Vector2 vector2 = vector - this.m_PrePos;
Vector2 vec = CalculateOffset(vector2);
this.SetContentPosition(vec);
m_PrePos = vector;
}
}
///
/// 移动到指定索引
///
///
public virtual void MoveToIndex(int ind)
{
if (m_IsNormalizing)
{
return;
}
if (ind == m_index)
{
return;
}
this.m_IsNormalizing = true;
Vector2 offset;
if (MMoveAxisType == AxisType.Horizontal)
{
offset = new Vector2(mCellSize.x + mSpacing.x, 0);
}
else
{
offset = new Vector2(0, mCellSize.y + mSpacing.y);
}
var delta = CalcCorrectDeltaPos();
int vindex = m_index;
m_CurrentPos = delta + offset * (ind - vindex);
m_currentStep = 0;
}
private Vector2 CalculateOffset(Vector2 delta)
{
if (MMoveAxisType == AxisType.Horizontal)
{
delta.y = 0;
}
else
{
delta.x = 0;
}
return delta;
}
private void SetContentPosition(Vector2 position)
{
foreach (RectTransform i in viewRectTran)
{
i.localPosition += (Vector3)position;
}
return;
}
public virtual void OnEndDrag(PointerEventData eventData)
{
if (!mDrag || !contentCheckCache)
{
return;
}
this.m_Dragging = false;
this.m_IsNormalizing = true;
m_CurrentPos = CalcCorrectDeltaPos();
m_currentStep = 0;
}
public virtual void Rebuild(CanvasUpdate executing)
{
return;
}
///
/// List是否处于可自由调整状态
///
///
public virtual bool EnsureListCanAdjust()
{
return !m_Dragging && ContentIsLongerThanRect();
}
///
/// 内容是否比显示范围大
///
///
public virtual bool ContentIsLongerThanRect()
{
float contentLen;
float rectLen;
if (MMoveAxisType == AxisType.Horizontal)
{
contentLen = CellCount * (mCellSize.x + mSpacing.x) - mSpacing.x;
rectLen = viewRectTran.rect.xMax - viewRectTran.rect.xMin;
}
else
{
contentLen = CellCount * (mCellSize.y + mSpacing.y) - mSpacing.y;
rectLen = viewRectTran.rect.yMax - viewRectTran.rect.yMin;
}
contentCheckCache = contentLen > rectLen;
return contentCheckCache;
}
///
/// 检测边界情况，分为0未触界，-1左(下)触界，1右(上)触界
///
///
public virtual int GetBoundaryState()
{
RectTransform left;
RectTransform right;
left = GetChild(viewRectTran, 0);
right = GetChild(viewRectTran, CellCount - 1);
Vector3[] l = new Vector3[4];
left.GetWorldCorners(l);
Vector3[] r = new Vector3[4];
right.GetWorldCorners(r);
if (MMoveAxisType == AxisType.Horizontal)
{
if (l[0].x >= viewRectXMin)
{
return -1;
}
else if (r[3].x < viewRectXMax)
{
return 1;
}
}
else
{
if (l[0].y >= viewRectYMin)
{
return -1;
}
else if (r[1].y < viewRectYMax)
{
return 1;
}
}
return 0;
}
///
/// Loop列表，分为-1把最右(上)边一个移到最左(下)边，1把最左(下)边一个移到最右(上)边
///
///
protected virtual void LoopCell(int dir)
{
if (dir == 0)
{
return;
}
RectTransform MoveCell;
RectTransform Tarborder;
Vector2 TarPos;
if (dir == 1)
{
MoveCell = GetChild(viewRectTran, 0);
Tarborder = GetChild(viewRectTran, CellCount - 1);
MoveCell.SetSiblingIndex(CellCount - 1);
}
else
{
Tarborder = GetChild(viewRectTran, 0);
MoveCell = GetChild(viewRectTran, CellCount - 1);
MoveCell.SetSiblingIndex(0);
}
if (MMoveAxisType == AxisType.Horizontal)
{
TarPos = Tarborder.localPosition + new Vector3((mCellSize.x + mSpacing.x) * dir, 0, 0);
}
else
{
TarPos = (Vector2)Tarborder.localPosition + new Vector2(0, (mCellSize.y + mSpacing.y) * dir);
}
MoveCell.localPosition = TarPos;
}
///
/// 计算一个最近的正确位置
///
///
public virtual Vector2 CalcCorrectDeltaPos()
{
Vector2 delta = Vector2.zero;
float distance = float.MaxValue;
foreach (RectTransform i in viewRectTran)
{
var td = Mathf.Abs(i.localPosition.x) + Mathf.Abs(i.localPosition.y);
if (td <= distance)
{
distance = td;
delta = i.localPosition;
}
else
{
break;
}
}
return delta;
}
///
/// 移动指定增量
///
protected virtual void TweenToCorrect(Vector2 delta)
{
foreach (RectTransform i in viewRectTran)
{
i.localPosition += (Vector3)delta;
}
}
private static RectTransform GetChild(RectTransform parent, int index)
{
if (parent == null || index >= parent.childCount)
{
return null;
}
return parent.GetChild(index) as RectTransform;
}
public void LayoutComplete()
{
}
public void GraphicUpdateComplete()
{
}
///
/// 当前中心位置index回调
///
///
public void OnChangeIndex(int index)
{
}
}