Merged in fancyscrollview_Update (pull request #62)

Updated Fancy Scroll view to the latest
release
Simon Jackson 2019-11-15 16:03:08 +00:00
commit b3e4b0fcd5
14 changed files with 949 additions and 198 deletions

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/// Credit setchi (https://github.com/setchi)
/// Sourced from - https://github.com/setchi/FancyScrollView
using UnityEditor;
using UnityEditor.AnimatedValues;
// For manteinance, every new [SerializeField] variable in Scroller must be declared here
namespace UnityEngine.UI.Extensions
{
[CustomEditor(typeof(Scroller))]
[CanEditMultipleObjects]
public class ScrollerEditor : Editor
{
SerializedProperty viewport;
SerializedProperty directionOfRecognize;
SerializedProperty movementType;
SerializedProperty elasticity;
SerializedProperty scrollSensitivity;
SerializedProperty inertia;
SerializedProperty decelerationRate;
SerializedProperty snap;
SerializedProperty snapEnable;
SerializedProperty snapVelocityThreshold;
SerializedProperty snapDuration;
SerializedProperty snapEasing;
AnimBool showElasticity;
AnimBool showInertiaRelatedValues;
AnimBool showSnapEnableRelatedValues;
void OnEnable()
{
viewport = serializedObject.FindProperty("viewport");
directionOfRecognize = serializedObject.FindProperty("directionOfRecognize");
movementType = serializedObject.FindProperty("movementType");
elasticity = serializedObject.FindProperty("elasticity");
scrollSensitivity = serializedObject.FindProperty("scrollSensitivity");
inertia = serializedObject.FindProperty("inertia");
decelerationRate = serializedObject.FindProperty("decelerationRate");
snap = serializedObject.FindProperty("snap");
snapEnable = serializedObject.FindProperty("snap.Enable");
snapVelocityThreshold = serializedObject.FindProperty("snap.VelocityThreshold");
snapDuration = serializedObject.FindProperty("snap.Duration");
snapEasing = serializedObject.FindProperty("snap.Easing");
showElasticity = new AnimBool(Repaint);
showInertiaRelatedValues = new AnimBool(Repaint);
showSnapEnableRelatedValues = new AnimBool(Repaint);
SetAnimBools(true);
}
void OnDisable()
{
showElasticity.valueChanged.RemoveListener(Repaint);
showInertiaRelatedValues.valueChanged.RemoveListener(Repaint);
showSnapEnableRelatedValues.valueChanged.RemoveListener(Repaint);
}
void SetAnimBools(bool instant)
{
SetAnimBool(showElasticity, !movementType.hasMultipleDifferentValues && movementType.enumValueIndex == (int)Scroller.MovementType.Elastic, instant);
SetAnimBool(showInertiaRelatedValues, !inertia.hasMultipleDifferentValues && inertia.boolValue, instant);
SetAnimBool(showSnapEnableRelatedValues, !snapEnable.hasMultipleDifferentValues && snapEnable.boolValue, instant);
}
void SetAnimBool(AnimBool a, bool value, bool instant)
{
if (instant)
{
a.value = value;
}
else
{
a.target = value;
}
}
public override void OnInspectorGUI()
{
SetAnimBools(false);
serializedObject.Update();
EditorGUILayout.PropertyField(viewport);
EditorGUILayout.PropertyField(directionOfRecognize);
EditorGUILayout.PropertyField(movementType);
DrawMovementTypeRelatedValue();
EditorGUILayout.PropertyField(scrollSensitivity);
EditorGUILayout.PropertyField(inertia);
DrawInertiaRelatedValues();
serializedObject.ApplyModifiedProperties();
}
void DrawMovementTypeRelatedValue()
{
using (var group = new EditorGUILayout.FadeGroupScope(showElasticity.faded))
{
if (!group.visible)
{
return;
}
using (new EditorGUI.IndentLevelScope())
{
EditorGUILayout.PropertyField(elasticity);
}
}
}
void DrawInertiaRelatedValues()
{
using (var group = new EditorGUILayout.FadeGroupScope(showInertiaRelatedValues.faded))
{
if (!group.visible)
{
return;
}
using (new EditorGUI.IndentLevelScope())
{
EditorGUILayout.PropertyField(decelerationRate);
EditorGUILayout.PropertyField(snap);
using (new EditorGUI.IndentLevelScope())
{
DrawSnapRelatedValues();
}
}
}
}
void DrawSnapRelatedValues()
{
if (snap.isExpanded)
{
EditorGUILayout.PropertyField(snapEnable);
using (var group = new EditorGUILayout.FadeGroupScope(showSnapEnableRelatedValues.faded))
{
if (!group.visible)
{
return;
}
EditorGUILayout.PropertyField(snapVelocityThreshold);
EditorGUILayout.PropertyField(snapDuration);
EditorGUILayout.PropertyField(snapEasing);
}
}
}
}
}

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/// Credit setchi (https://github.com/setchi)
/// Sourced from - https://github.com/setchi/FancyScrollView
using System.Collections.Generic;
namespace UnityEngine.UI.Extensions
{
public abstract class FancyScrollView<TData, TContext> : MonoBehaviour where TContext : class
{
[SerializeField, Range(float.Epsilon, 1f)]
float cellInterval = 0;
[SerializeField, Range(0f, 1f)]
float cellOffset = 0;
[SerializeField]
bool loop = false;
[SerializeField]
GameObject cellBase = null;
[SerializeField]
Transform cellContainer = null;
readonly List<FancyScrollViewCell<TData, TContext>> cells = new List<FancyScrollViewCell<TData, TContext>>();
float currentPosition;
protected List<TData> cellData = new List<TData>();
protected TContext Context { get; private set; }
/// <summary>
/// Sets the context.
/// </summary>
/// <param name="context">Context.</param>
protected void SetContext(TContext context)
{
Context = context;
for (int i = 0; i < cells.Count; i++)
{
cells[i].SetContext(context);
}
}
/// <summary>
/// Updates the contents.
/// </summary>
protected void UpdateContents()
{
UpdatePosition(currentPosition, true);
}
/// <summary>
/// Updates the scroll position.
/// </summary>
/// <param name="position">Position.</param>
/// <param name="forceUpdateContents">If set to <c>true</c> force update contents.</param>
protected void UpdatePosition(float position, bool forceUpdateContents = false)
{
currentPosition = position;
var visibleMinPosition = position - (cellOffset / cellInterval);
var firstCellPosition = (Mathf.Ceil(visibleMinPosition) - visibleMinPosition) * cellInterval;
var dataStartIndex = Mathf.CeilToInt(visibleMinPosition);
var count = 0;
for (float p = firstCellPosition; p <= 1f; p += cellInterval, count++)
{
if (count >= cells.Count)
{
cells.Add(CreateCell());
}
}
count = 0;
for (float p = firstCellPosition; p <= 1f; p += cellInterval, count++)
{
var dataIndex = dataStartIndex + count;
var cell = cells[GetCircularIndex(dataIndex, cells.Count)];
UpdateCell(cell, dataIndex, forceUpdateContents);
if (cell.gameObject.activeSelf)
{
cell.UpdatePosition(p);
}
}
while (count < cells.Count)
{
cells[GetCircularIndex(dataStartIndex + count, cells.Count)].SetVisible(false);
count++;
}
}
/// <summary>
/// Updates the cell.
/// </summary>
/// <param name="cell">Cell.</param>
/// <param name="dataIndex">Data index.</param>
/// <param name="forceUpdateContents">If set to <c>true</c> force update contents.</param>
void UpdateCell(FancyScrollViewCell<TData, TContext> cell, int dataIndex, bool forceUpdateContents = false)
{
if (loop)
{
dataIndex = GetCircularIndex(dataIndex, cellData.Count);
}
else if (dataIndex < 0 || dataIndex > cellData.Count - 1)
{
// セルに対応するデータが存在しなければセルを表示しない
cell.SetVisible(false);
return;
}
if (forceUpdateContents || cell.DataIndex != dataIndex || !cell.IsVisible)
{
cell.DataIndex = dataIndex;
cell.SetVisible(true);
cell.UpdateContent(cellData[dataIndex]);
}
}
/// <summary>
/// Creates the cell.
/// </summary>
/// <returns>The cell.</returns>
FancyScrollViewCell<TData, TContext> CreateCell()
{
var cellObject = Instantiate(cellBase, cellContainer);
var cell = cellObject.GetComponent<FancyScrollViewCell<TData, TContext>>();
cell.SetContext(Context);
cell.SetVisible(false);
cell.DataIndex = -1;
return cell;
}
/// <summary>
/// Gets the circular index.
/// </summary>
/// <returns>The circular index.</returns>
/// <param name="index">Index.</param>
/// <param name="maxSize">Max size.</param>
int GetCircularIndex(int index, int maxSize)
{
return index < 0 ? maxSize - 1 + (index + 1) % maxSize : index % maxSize;
}
#if UNITY_EDITOR
bool cachedLoop;
float cachedCellInterval, cachedCellOffset;
void LateUpdate()
{
if (cachedLoop != loop || cachedCellOffset != cellOffset || cachedCellInterval != cellInterval)
{
cachedLoop = loop;
cachedCellOffset = cellOffset;
cachedCellInterval = cellInterval;
UpdatePosition(currentPosition);
}
}
#endif
}
public sealed class FancyScrollViewNullContext
{
}
public abstract class FancyScrollView<TData> : FancyScrollView<TData, FancyScrollViewNullContext>
{
}
}

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//
// EasingCore - https://github.com/setchi/EasingCore
//
// The MIT License (MIT)
//
// Copyright (c) 2019 setchi
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
using System;
using UnityEngine;
namespace UnityEngine.UI.Extensions.EasingCore
{
public enum Ease
{
Linear,
InBack,
InBounce,
InCirc,
InCubic,
InElastic,
InExpo,
InQuad,
InQuart,
InQuint,
InSine,
OutBack,
OutBounce,
OutCirc,
OutCubic,
OutElastic,
OutExpo,
OutQuad,
OutQuart,
OutQuint,
OutSine,
InOutBack,
InOutBounce,
InOutCirc,
InOutCubic,
InOutElastic,
InOutExpo,
InOutQuad,
InOutQuart,
InOutQuint,
InOutSine,
}
public static class EasingFunction
{
/// <summary>
/// Gets the easing function
/// </summary>
/// <param name="type">ease type</param>
/// <returns>easing function</returns>
public static Func<float, float> Get(Ease type)
{
switch (type)
{
case Ease.Linear: return Linear;
case Ease.InBack: return InBack;
case Ease.InBounce: return InBounce;
case Ease.InCirc: return InCirc;
case Ease.InCubic: return InCubic;
case Ease.InElastic: return InElastic;
case Ease.InExpo: return InExpo;
case Ease.InQuad: return InQuad;
case Ease.InQuart: return InQuart;
case Ease.InQuint: return InQuint;
case Ease.InSine: return InSine;
case Ease.OutBack: return OutBack;
case Ease.OutBounce: return OutBounce;
case Ease.OutCirc: return OutCirc;
case Ease.OutCubic: return OutCubic;
case Ease.OutElastic: return OutElastic;
case Ease.OutExpo: return OutExpo;
case Ease.OutQuad: return OutQuad;
case Ease.OutQuart: return OutQuart;
case Ease.OutQuint: return OutQuint;
case Ease.OutSine: return OutSine;
case Ease.InOutBack: return InOutBack;
case Ease.InOutBounce: return InOutBounce;
case Ease.InOutCirc: return InOutCirc;
case Ease.InOutCubic: return InOutCubic;
case Ease.InOutElastic: return InOutElastic;
case Ease.InOutExpo: return InOutExpo;
case Ease.InOutQuad: return InOutQuad;
case Ease.InOutQuart: return InOutQuart;
case Ease.InOutQuint: return InOutQuint;
case Ease.InOutSine: return InOutSine;
default: return Linear;
}
}
static float Linear(float t) => t;
static float InBack(float t) => t * t * t - t * Mathf.Sin(t * Mathf.PI);
static float OutBack(float t) => 1f - InBack(1f - t);
static float InOutBack(float t) =>
t < 0.5f
? 0.5f * InBack(2f * t)
: 0.5f * OutBack(2f * t - 1f) + 0.5f;
static float InBounce(float t) => 1f - OutBounce(1f - t);
static float OutBounce(float t) =>
t < 4f / 11.0f ?
(121f * t * t) / 16.0f :
t < 8f / 11.0f ?
(363f / 40.0f * t * t) - (99f / 10.0f * t) + 17f / 5.0f :
t < 9f / 10.0f ?
(4356f / 361.0f * t * t) - (35442f / 1805.0f * t) + 16061f / 1805.0f :
(54f / 5.0f * t * t) - (513f / 25.0f * t) + 268f / 25.0f;
static float InOutBounce(float t) =>
t < 0.5f
? 0.5f * InBounce(2f * t)
: 0.5f * OutBounce(2f * t - 1f) + 0.5f;
static float InCirc(float t) => 1f - Mathf.Sqrt(1f - (t * t));
static float OutCirc(float t) => Mathf.Sqrt((2f - t) * t);
static float InOutCirc(float t) =>
t < 0.5f
? 0.5f * (1 - Mathf.Sqrt(1f - 4f * (t * t)))
: 0.5f * (Mathf.Sqrt(-((2f * t) - 3f) * ((2f * t) - 1f)) + 1f);
static float InCubic(float t) => t * t * t;
static float OutCubic(float t) => InCubic(t - 1f) + 1f;
static float InOutCubic(float t) =>
t < 0.5f
? 4f * t * t * t
: 0.5f * InCubic(2f * t - 2f) + 1f;
static float InElastic(float t) => Mathf.Sin(13f * (Mathf.PI * 0.5f) * t) * Mathf.Pow(2f, 10f * (t - 1f));
static float OutElastic(float t) => Mathf.Sin(-13f * (Mathf.PI * 0.5f) * (t + 1)) * Mathf.Pow(2f, -10f * t) + 1f;
static float InOutElastic(float t) =>
t < 0.5f
? 0.5f * Mathf.Sin(13f * (Mathf.PI * 0.5f) * (2f * t)) * Mathf.Pow(2f, 10f * ((2f * t) - 1f))
: 0.5f * (Mathf.Sin(-13f * (Mathf.PI * 0.5f) * ((2f * t - 1f) + 1f)) * Mathf.Pow(2f, -10f * (2f * t - 1f)) + 2f);
static float InExpo(float t) => Mathf.Approximately(0.0f, t) ? t : Mathf.Pow(2f, 10f * (t - 1f));
static float OutExpo(float t) => Mathf.Approximately(1.0f, t) ? t : 1f - Mathf.Pow(2f, -10f * t);
static float InOutExpo(float v) =>
Mathf.Approximately(0.0f, v) || Mathf.Approximately(1.0f, v)
? v
: v < 0.5f
? 0.5f * Mathf.Pow(2f, (20f * v) - 10f)
: -0.5f * Mathf.Pow(2f, (-20f * v) + 10f) + 1f;
static float InQuad(float t) => t * t;
static float OutQuad(float t) => -t * (t - 2f);
static float InOutQuad(float t) =>
t < 0.5f
? 2f * t * t
: -2f * t * t + 4f * t - 1f;
static float InQuart(float t) => t * t * t * t;
static float OutQuart(float t)
{
var u = t - 1f;
return u * u * u * (1f - t) + 1f;
}
static float InOutQuart(float t) =>
t < 0.5f
? 8f * InQuart(t)
: -8f * InQuart(t - 1f) + 1f;
static float InQuint(float t) => t * t * t * t * t;
static float OutQuint(float t) => InQuint(t - 1f) + 1f;
static float InOutQuint(float t) =>
t < 0.5f
? 16f * InQuint(t)
: 0.5f * InQuint(2f * t - 2f) + 1f;
static float InSine(float t) => Mathf.Sin((t - 1f) * (Mathf.PI * 0.5f)) + 1f;
static float OutSine(float t) => Mathf.Sin(t * (Mathf.PI * 0.5f));
static float InOutSine(float t) => 0.5f * (1f - Mathf.Cos(t * Mathf.PI));
}
}

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/// Credit setchi (https://github.com/setchi)
/// Sourced from - https://github.com/setchi/FancyScrollView
using System;
using System.Collections.Generic;
using UnityEngine;
namespace UnityEngine.UI.Extensions
{
public abstract class FancyScrollView<TItemData, TContext> : MonoBehaviour where TContext : class, new()
{
[SerializeField, Range(float.Epsilon, 1f)] protected float cellInterval = 0.2f;
[SerializeField, Range(0f, 1f)] protected float scrollOffset = 0.5f;
[SerializeField] protected bool loop = false;
[SerializeField] protected Transform cellContainer = default;
readonly IList<FancyScrollViewCell<TItemData, TContext>> pool =
new List<FancyScrollViewCell<TItemData, TContext>>();
float currentPosition;
protected abstract GameObject CellPrefab { get; }
protected IList<TItemData> ItemsSource { get; set; } = new List<TItemData>();
protected TContext Context { get; } = new TContext();
/// <summary>
/// Updates the contents.
/// </summary>
/// <param name="itemsSource">Items source.</param>
protected void UpdateContents(IList<TItemData> itemsSource)
{
ItemsSource = itemsSource;
Refresh();
}
/// <summary>
/// Refreshes the cells.
/// </summary>
protected void Refresh() => UpdatePosition(currentPosition, true);
/// <summary>
/// Updates the scroll position.
/// </summary>
/// <param name="position">Position.</param>
protected void UpdatePosition(float position) => UpdatePosition(position, false);
void UpdatePosition(float position, bool forceRefresh)
{
currentPosition = position;
var p = position - scrollOffset / cellInterval;
var firstIndex = Mathf.CeilToInt(p);
var firstPosition = (Mathf.Ceil(p) - p) * cellInterval;
if (firstPosition + pool.Count * cellInterval < 1f)
{
ResizePool(firstPosition);
}
UpdateCells(firstPosition, firstIndex, forceRefresh);
}
void ResizePool(float firstPosition)
{
if (CellPrefab == null)
{
throw new NullReferenceException(nameof(CellPrefab));
}
if (cellContainer == null)
{
throw new MissingComponentException(nameof(cellContainer));
}
var addCount = Mathf.CeilToInt((1f - firstPosition) / cellInterval) - pool.Count;
for (var i = 0; i < addCount; i++)
{
var cell = Instantiate(CellPrefab, cellContainer).GetComponent<FancyScrollViewCell<TItemData, TContext>>();
if (cell == null)
{
throw new MissingComponentException(
$"FancyScrollViewCell<{typeof(TItemData).FullName}, {typeof(TContext).FullName}> " +
$"component not found in {CellPrefab.name}.");
}
cell.SetupContext(Context);
cell.SetVisible(false);
pool.Add(cell);
}
}
void UpdateCells(float firstPosition, int firstIndex, bool forceRefresh)
{
for (var i = 0; i < pool.Count; i++)
{
var index = firstIndex + i;
var position = firstPosition + i * cellInterval;
var cell = pool[CircularIndex(index, pool.Count)];
if (loop)
{
index = CircularIndex(index, ItemsSource.Count);
}
if (index < 0 || index >= ItemsSource.Count || position > 1f)
{
cell.SetVisible(false);
continue;
}
if (forceRefresh || cell.Index != index || !cell.IsVisible)
{
cell.Index = index;
cell.SetVisible(true);
cell.UpdateContent(ItemsSource[index]);
}
cell.UpdatePosition(position);
}
}
int CircularIndex(int i, int size) => size < 1 ? 0 : i < 0 ? size - 1 + (i + 1) % size : i % size;
#if UNITY_EDITOR
bool cachedLoop;
float cachedCellInterval, cachedScrollOffset;
void LateUpdate()
{
if (cachedLoop != loop || cachedCellInterval != cellInterval || cachedScrollOffset != scrollOffset)
{
cachedLoop = loop;
cachedCellInterval = cellInterval;
cachedScrollOffset = scrollOffset;
UpdatePosition(currentPosition);
}
}
#endif
}
public sealed class FancyScrollViewNullContext
{
}
public abstract class FancyScrollView<TItemData> : FancyScrollView<TItemData, FancyScrollViewNullContext>
{
}
}

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/// Credit setchi (https://github.com/setchi)
/// Sourced from - https://github.com/setchi/FancyScrollView
using UnityEngine;
namespace UnityEngine.UI.Extensions
{
public abstract class FancyScrollViewCell<TData, TContext> : MonoBehaviour where TContext : class
public abstract class FancyScrollViewCell<TItemData, TContext> : MonoBehaviour where TContext : class, new()
{
/// <summary>
/// Gets or sets the index of the data.
/// </summary>
/// <value>The index of the data.</value>
public int DataIndex { get; set; }
public int Index { get; set; } = -1;
/// <summary>
/// Gets a value indicating whether this <see cref="T:FancyScrollView.FancyScrollViewCell`2"/> is visible.
/// </summary>
/// <value><c>true</c> if is visible; otherwise, <c>false</c>.</value>
public virtual bool IsVisible { get { return gameObject.activeSelf; } }
public virtual bool IsVisible => gameObject.activeSelf;
/// <summary>
/// Gets the context.
@ -24,41 +26,32 @@ namespace UnityEngine.UI.Extensions
protected TContext Context { get; private set; }
/// <summary>
/// Sets the context.
/// Setup the context.
/// </summary>
/// <param name="context">Context.</param>
public virtual void SetContext(TContext context)
{
Context = context;
}
public virtual void SetupContext(TContext context) => Context = context;
/// <summary>
/// Sets the visible.
/// </summary>
/// <param name="visible">If set to <c>true</c> visible.</param>
public virtual void SetVisible(bool visible)
{
gameObject.SetActive(visible);
}
public virtual void SetVisible(bool visible) => gameObject.SetActive(visible);
/// <summary>
/// Updates the content.
/// </summary>
/// <param name="itemData">Item data.</param>
public virtual void UpdateContent(TData itemData)
{
}
public abstract void UpdateContent(TItemData itemData);
/// <summary>
/// Updates the position.
/// </summary>
/// <param name="position">Position.</param>
public virtual void UpdatePosition(float position)
{
}
public abstract void UpdatePosition(float position);
}
public abstract class FancyScrollViewCell<TData> : FancyScrollViewCell<TData, FancyScrollViewNullContext>
public abstract class FancyScrollViewCell<TItemData> : FancyScrollViewCell<TItemData, FancyScrollViewNullContext>
{
public sealed override void SetupContext(FancyScrollViewNullContext context) => base.SetupContext(context);
}
}

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/// Credit setchi (https://github.com/setchi)
/// Sourced from - https://github.com/setchi/FancyScrollView
using System;
using UnityEngine.EventSystems;
using UnityEngine.UI.Extensions.EasingCore;
namespace UnityEngine.UI.Extensions
{
public class Scroller : UIBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
{
[SerializeField] RectTransform viewport = default;
[SerializeField] ScrollDirection directionOfRecognize = ScrollDirection.Vertical;
[SerializeField] MovementType movementType = MovementType.Elastic;
[SerializeField] float elasticity = 0.1f;
[SerializeField] float scrollSensitivity = 1f;
[SerializeField] bool inertia = true;
[SerializeField] float decelerationRate = 0.03f;
[SerializeField] Snap snap = new Snap {
Enable = true,
VelocityThreshold = 0.5f,
Duration = 0.3f,
Easing = Ease.InOutCubic
};
readonly AutoScrollState autoScrollState = new AutoScrollState();
Action<float> onValueChanged;
Action<int> onSelectionChanged;
Vector2 pointerStartLocalPosition;
float dragStartScrollPosition;
float prevScrollPosition;
float currentScrollPosition;
int totalCount;
bool dragging;
float velocity;
enum ScrollDirection
{
Vertical,
Horizontal,
}
public enum MovementType
{
Unrestricted = ScrollRect.MovementType.Unrestricted,
Elastic = ScrollRect.MovementType.Elastic,
Clamped = ScrollRect.MovementType.Clamped
}
[Serializable]
class Snap
{
public bool Enable;
public float VelocityThreshold;
public float Duration;
public Ease Easing;
}
static readonly Func<float, float> DefaultEasingFunction = EasingFunction.Get(Ease.OutCubic);
class AutoScrollState
{
public bool Enable;
public bool Elastic;
public float Duration;
public Func<float, float> EasingFunction;
public float StartTime;
public float EndScrollPosition;
public Action OnComplete;
public void Reset()
{
Enable = false;
Elastic = false;
Duration = 0f;
StartTime = 0f;
EasingFunction = DefaultEasingFunction;
EndScrollPosition = 0f;
OnComplete = null;
}
public void Complete()
{
OnComplete?.Invoke();
Reset();
}
}
public void OnValueChanged(Action<float> callback) => onValueChanged = callback;
public void OnSelectionChanged(Action<int> callback) => onSelectionChanged = callback;
public void SetTotalCount(int totalCount) => this.totalCount = totalCount;
public void ScrollTo(int index, float duration, Action onComplete = null) => ScrollTo(index, duration, Ease.OutCubic, onComplete);
public void ScrollTo(int index, float duration, Ease easing, Action onComplete = null) => ScrollTo(index, duration, EasingFunction.Get(easing), onComplete);
public void ScrollTo(int index, float duration, Func<float, float> easingFunction, Action onComplete = null)
{
if (duration <= 0f)
{
JumpTo(index);
return;
}
autoScrollState.Reset();
autoScrollState.Enable = true;
autoScrollState.Duration = duration;
autoScrollState.EasingFunction = easingFunction ?? DefaultEasingFunction;
autoScrollState.StartTime = Time.unscaledTime;
autoScrollState.EndScrollPosition = CalculateDestinationIndex(index);
autoScrollState.OnComplete = onComplete;
velocity = 0f;
dragStartScrollPosition = currentScrollPosition;
UpdateSelection(Mathf.RoundToInt(CircularPosition(autoScrollState.EndScrollPosition, totalCount)));
}
public void JumpTo(int index)
{
autoScrollState.Reset();
velocity = 0f;
dragging = false;
index = CalculateDestinationIndex(index);
UpdateSelection(index);
UpdatePosition(index);
}
void IBeginDragHandler.OnBeginDrag(PointerEventData eventData)
{
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
pointerStartLocalPosition = Vector2.zero;
RectTransformUtility.ScreenPointToLocalPointInRectangle(
viewport,
eventData.position,
eventData.pressEventCamera,
out pointerStartLocalPosition);
dragStartScrollPosition = currentScrollPosition;
dragging = true;
autoScrollState.Reset();
}
void IDragHandler.OnDrag(PointerEventData eventData)
{
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
if (!dragging)
{
return;
}
if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(
viewport,
eventData.position,
eventData.pressEventCamera,
out var localCursor))
{
return;
}
var pointerDelta = localCursor - pointerStartLocalPosition;
var position = (directionOfRecognize == ScrollDirection.Horizontal ? -pointerDelta.x : pointerDelta.y)
/ ViewportSize
* scrollSensitivity
+ dragStartScrollPosition;
var offset = CalculateOffset(position);
position += offset;
if (movementType == MovementType.Elastic)
{
if (offset != 0f)
{
position -= RubberDelta(offset, scrollSensitivity);
}
}
UpdatePosition(position);
}
void IEndDragHandler.OnEndDrag(PointerEventData eventData)
{
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
dragging = false;
}
float ViewportSize => directionOfRecognize == ScrollDirection.Horizontal
? viewport.rect.size.x
: viewport.rect.size.y;
float CalculateOffset(float position)
{
if (movementType == MovementType.Unrestricted)
{
return 0f;
}
if (position < 0f)
{
return -position;
}
if (position > totalCount - 1)
{
return totalCount - 1 - position;
}
return 0f;
}
void UpdatePosition(float position)
{
currentScrollPosition = position;
onValueChanged?.Invoke(currentScrollPosition);
}
void UpdateSelection(int index) => onSelectionChanged?.Invoke(index);
float RubberDelta(float overStretching, float viewSize) =>
(1 - 1 / (Mathf.Abs(overStretching) * 0.55f / viewSize + 1)) * viewSize * Mathf.Sign(overStretching);
void Update()
{
var deltaTime = Time.unscaledDeltaTime;
var offset = CalculateOffset(currentScrollPosition);
if (autoScrollState.Enable)
{
var position = 0f;
if (autoScrollState.Elastic)
{
position = Mathf.SmoothDamp(currentScrollPosition, currentScrollPosition + offset, ref velocity,
elasticity, Mathf.Infinity, deltaTime);
if (Mathf.Abs(velocity) < 0.01f)
{
position = Mathf.Clamp(Mathf.RoundToInt(position), 0, totalCount - 1);
velocity = 0f;
autoScrollState.Complete();
}
}
else
{
var alpha = Mathf.Clamp01((Time.unscaledTime - autoScrollState.StartTime) /
Mathf.Max(autoScrollState.Duration, float.Epsilon));
position = Mathf.LerpUnclamped(dragStartScrollPosition, autoScrollState.EndScrollPosition,
autoScrollState.EasingFunction(alpha));
if (Mathf.Approximately(alpha, 1f))
{
autoScrollState.Complete();
}
}
UpdatePosition(position);
}
else if (!dragging && (!Mathf.Approximately(offset, 0f) || !Mathf.Approximately(velocity, 0f)))
{
var position = currentScrollPosition;
if (movementType == MovementType.Elastic && !Mathf.Approximately(offset, 0f))
{
autoScrollState.Reset();
autoScrollState.Enable = true;
autoScrollState.Elastic = true;
UpdateSelection(Mathf.Clamp(Mathf.RoundToInt(position), 0, totalCount - 1));
}
else if (inertia)
{
velocity *= Mathf.Pow(decelerationRate, deltaTime);
if (Mathf.Abs(velocity) < 0.001f)
{
velocity = 0f;
}
position += velocity * deltaTime;
if (snap.Enable && Mathf.Abs(velocity) < snap.VelocityThreshold)
{
ScrollTo(Mathf.RoundToInt(currentScrollPosition), snap.Duration, snap.Easing);
}
}
else
{
velocity = 0f;
}
if (!Mathf.Approximately(velocity, 0f))
{
if (movementType == MovementType.Clamped)
{
offset = CalculateOffset(position);
position += offset;
if (Mathf.Approximately(position, 0f) || Mathf.Approximately(position, totalCount - 1f))
{
velocity = 0f;
UpdateSelection(Mathf.RoundToInt(position));
}
}
UpdatePosition(position);
}
}
if (!autoScrollState.Enable && dragging && inertia)
{
var newVelocity = (currentScrollPosition - prevScrollPosition) / deltaTime;
velocity = Mathf.Lerp(velocity, newVelocity, deltaTime * 10f);
}
prevScrollPosition = currentScrollPosition;
}
int CalculateDestinationIndex(int index) => movementType == MovementType.Unrestricted
? CalculateClosestIndex(index)
: Mathf.Clamp(index, 0, totalCount - 1);
int CalculateClosestIndex(int index)
{
var diff = CircularPosition(index, totalCount)
- CircularPosition(currentScrollPosition, totalCount);
if (Mathf.Abs(diff) > totalCount * 0.5f)
{
diff = Mathf.Sign(-diff) * (totalCount - Mathf.Abs(diff));
}
return Mathf.RoundToInt(diff + currentScrollPosition);
}
float CircularPosition(float p, int size) => size < 1 ? 0 : p < 0 ? size - 1 + (p + 1) % size : p % size;
}
}

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