572 lines
19 KiB
C#
572 lines
19 KiB
C#
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/// Credit BinaryX
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/// Sourced from - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-1945602
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/// Updated by ddreaper - removed dependency on a custom ScrollRect script. Now implements drag interfaces and standard Scroll Rect.
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/// Update by xesenix - rewrote almost the entire code
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/// - configuration for direction move instead of 2 concurrent class (easier to change direction in editor)
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/// - supports list layout with horizontal or vertical layout need to match direction with type of layout used
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/// - dynamic checks if scrolled list size changes and recalculates anchor positions
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/// and item size based on itemsVisibleAtOnce and size of root container
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/// if you don't wish to use this auto resize turn of autoLayoutItems
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/// - fixed current page made it independent from pivot
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/// - replaced pagination with delegate function
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using System;
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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[ExecuteInEditMode]
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[RequireComponent(typeof(ScrollRect))]
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[AddComponentMenu("UI/Extensions/Scroll Snap")]
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public class ScrollSnap : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler, IScrollSnap
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{
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// needed because of reversed behaviour of axis Y compared to X
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// (positions of children lower in children list in horizontal directions grows when in vertical it gets smaller)
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public enum ScrollDirection
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{
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Horizontal,
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Vertical
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}
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private ScrollRect _scroll_rect;
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private RectTransform _scrollRectTransform;
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private Transform _listContainerTransform;
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//private RectTransform _rectTransform;
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private int _pages;
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private int _startingPage = 0;
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// anchor points to lerp to to see child on certain indexes
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private Vector3[] _pageAnchorPositions;
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private Vector3 _lerpTarget;
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private bool _lerp;
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// item list related
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private float _listContainerMinPosition;
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private float _listContainerMaxPosition;
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private float _listContainerSize;
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private RectTransform _listContainerRectTransform;
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private Vector2 _listContainerCachedSize;
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private float _itemSize;
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private int _itemsCount = 0;
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// drag related
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private bool _startDrag = true;
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private Vector3 _positionOnDragStart = new Vector3();
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private int _pageOnDragStart;
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private bool _fastSwipeTimer = false;
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private int _fastSwipeCounter = 0;
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private int _fastSwipeTarget = 10;
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[Tooltip("Button to go to the next page. (optional)")]
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public Button NextButton;
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[Tooltip("Button to go to the previous page. (optional)")]
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public Button PrevButton;
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[Tooltip("Number of items visible in one page of scroll frame.")]
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[RangeAttribute(1, 100)]
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public int ItemsVisibleAtOnce = 1;
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[Tooltip("Sets minimum width of list items to 1/itemsVisibleAtOnce.")]
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public bool AutoLayoutItems = true;
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[Tooltip("If you wish to update scrollbar numberOfSteps to number of active children on list.")]
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public bool LinkScrolbarSteps = false;
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[Tooltip("If you wish to update scrollrect sensitivity to size of list element.")]
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public bool LinkScrolrectScrollSensitivity = false;
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public Boolean UseFastSwipe = true;
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public int FastSwipeThreshold = 100;
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public delegate void PageSnapChange(int page);
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public event PageSnapChange onPageChange;
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public ScrollDirection direction = ScrollDirection.Horizontal;
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// Use this for initialization
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void Start()
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{
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_lerp = false;
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_scroll_rect = gameObject.GetComponent<ScrollRect>();
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_scrollRectTransform = gameObject.GetComponent<RectTransform>();
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_listContainerTransform = _scroll_rect.content;
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_listContainerRectTransform = _listContainerTransform.GetComponent<RectTransform>();
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//_rectTransform = _listContainerTransform.gameObject.GetComponent<RectTransform>();
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UpdateListItemsSize();
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UpdateListItemPositions();
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PageChanged(CurrentPage());
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if (NextButton)
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{
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NextButton.GetComponent<Button>().onClick.AddListener(() =>
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{
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NextScreen();
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});
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}
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if (PrevButton)
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{
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PrevButton.GetComponent<Button>().onClick.AddListener(() =>
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{
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PreviousScreen();
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});
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}
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if (_scroll_rect.horizontalScrollbar != null && _scroll_rect.horizontal)
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{
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var hscroll = _scroll_rect.horizontalScrollbar.gameObject.GetOrAddComponent<ScrollSnapScrollbarHelper>();
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hscroll.ss = this;
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}
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if (_scroll_rect.verticalScrollbar != null && _scroll_rect.vertical)
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{
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var vscroll = _scroll_rect.verticalScrollbar.gameObject.GetOrAddComponent<ScrollSnapScrollbarHelper>();
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vscroll.ss = this;
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}
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}
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public void UpdateListItemsSize()
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{
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float size = 0;
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float currentSize = 0;
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if (direction == ScrollSnap.ScrollDirection.Horizontal)
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{
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size = _scrollRectTransform.rect.width / ItemsVisibleAtOnce;
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currentSize = _listContainerRectTransform.rect.width / _itemsCount;
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}
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else
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{
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size = _scrollRectTransform.rect.height / ItemsVisibleAtOnce;
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currentSize = _listContainerRectTransform.rect.height / _itemsCount;
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}
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_itemSize = size;
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if (LinkScrolrectScrollSensitivity)
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{
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_scroll_rect.scrollSensitivity = _itemSize;
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}
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if (AutoLayoutItems && currentSize != size && _itemsCount > 0)
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{
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if (direction == ScrollSnap.ScrollDirection.Horizontal)
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{
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foreach (var tr in _listContainerTransform)
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{
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GameObject child = ((Transform)tr).gameObject;
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if (child.activeInHierarchy)
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{
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var childLayout = child.GetComponent<LayoutElement>();
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if (childLayout == null)
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{
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childLayout = child.AddComponent<LayoutElement>();
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}
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childLayout.minWidth = _itemSize;
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}
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}
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}
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else
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{
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foreach (var tr in _listContainerTransform)
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{
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GameObject child = ((Transform)tr).gameObject;
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if (child.activeInHierarchy)
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{
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var childLayout = child.GetComponent<LayoutElement>();
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if (childLayout == null)
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{
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childLayout = child.AddComponent<LayoutElement>();
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}
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childLayout.minHeight = _itemSize;
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}
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}
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}
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}
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}
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public void UpdateListItemPositions()
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{
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if (!_listContainerRectTransform.rect.size.Equals(_listContainerCachedSize))
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{
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// checking how many children of list are active
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int activeCount = 0;
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foreach (var tr in _listContainerTransform)
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{
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if (((Transform)tr).gameObject.activeInHierarchy)
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{
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activeCount++;
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}
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}
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// if anything changed since last check reinitialize anchors list
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_itemsCount = 0;
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Array.Resize(ref _pageAnchorPositions, activeCount);
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if (activeCount > 0)
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{
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_pages = Mathf.Max(activeCount - ItemsVisibleAtOnce + 1, 1);
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if (direction == ScrollDirection.Horizontal)
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{
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// looking for list spanning range min/max
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_scroll_rect.horizontalNormalizedPosition = 0;
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_listContainerMaxPosition = _listContainerTransform.localPosition.x;
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_scroll_rect.horizontalNormalizedPosition = 1;
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_listContainerMinPosition = _listContainerTransform.localPosition.x;
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_listContainerSize = _listContainerMaxPosition - _listContainerMinPosition;
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for (var i = 0; i < _pages; i++)
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{
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_pageAnchorPositions[i] = new Vector3(
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_listContainerMaxPosition - _itemSize * i,
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_listContainerTransform.localPosition.y,
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_listContainerTransform.localPosition.z
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);
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}
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}
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else
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{
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//Debug.Log ("-------------looking for list spanning range----------------");
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// looking for list spanning range
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_scroll_rect.verticalNormalizedPosition = 1;
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_listContainerMinPosition = _listContainerTransform.localPosition.y;
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_scroll_rect.verticalNormalizedPosition = 0;
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_listContainerMaxPosition = _listContainerTransform.localPosition.y;
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_listContainerSize = _listContainerMaxPosition - _listContainerMinPosition;
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for (var i = 0; i < _pages; i++)
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{
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_pageAnchorPositions[i] = new Vector3(
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_listContainerTransform.localPosition.x,
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_listContainerMinPosition + _itemSize * i,
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_listContainerTransform.localPosition.z
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);
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}
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}
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UpdateScrollbar(LinkScrolbarSteps);
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_startingPage = Mathf.Min(_startingPage, _pages);
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ResetPage();
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}
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if (_itemsCount != activeCount)
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{
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PageChanged(CurrentPage());
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}
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_itemsCount = activeCount;
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_listContainerCachedSize.Set(_listContainerRectTransform.rect.size.x, _listContainerRectTransform.rect.size.y);
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}
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}
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public void ResetPage()
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{
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if (direction == ScrollDirection.Horizontal)
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{
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_scroll_rect.horizontalNormalizedPosition = _pages > 1 ? (float)_startingPage / (float)(_pages - 1) : 0;
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}
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else
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{
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_scroll_rect.verticalNormalizedPosition = _pages > 1 ? (float)(_pages - _startingPage - 1) / (float)(_pages - 1) : 0;
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}
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}
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private void UpdateScrollbar(bool linkSteps)
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{
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if (linkSteps)
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{
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if (direction == ScrollDirection.Horizontal)
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{
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if (_scroll_rect.horizontalScrollbar != null)
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{
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_scroll_rect.horizontalScrollbar.numberOfSteps = _pages;
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}
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}
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else
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{
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if (_scroll_rect.verticalScrollbar != null)
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{
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_scroll_rect.verticalScrollbar.numberOfSteps = _pages;
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}
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}
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}
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else
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{
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if (direction == ScrollDirection.Horizontal)
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{
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if (_scroll_rect.horizontalScrollbar != null)
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{
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_scroll_rect.horizontalScrollbar.numberOfSteps = 0;
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}
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}
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else
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{
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if (_scroll_rect.verticalScrollbar != null)
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{
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_scroll_rect.verticalScrollbar.numberOfSteps = 0;
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}
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}
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}
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}
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void LateUpdate()
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{
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UpdateListItemsSize();
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UpdateListItemPositions();
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if (_lerp)
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{
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UpdateScrollbar(false);
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_listContainerTransform.localPosition = Vector3.Lerp(_listContainerTransform.localPosition, _lerpTarget, 7.5f * Time.deltaTime);
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if (Vector3.Distance(_listContainerTransform.localPosition, _lerpTarget) < 0.001f)
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{
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_listContainerTransform.localPosition = _lerpTarget;
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_lerp = false;
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UpdateScrollbar(LinkScrolbarSteps);
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}
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//change the info bullets at the bottom of the screen. Just for visual effect
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if (Vector3.Distance(_listContainerTransform.localPosition, _lerpTarget) < 10f)
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{
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PageChanged(CurrentPage());
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}
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}
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if (_fastSwipeTimer)
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{
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_fastSwipeCounter++;
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}
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}
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private bool fastSwipe = false; //to determine if a fast swipe was performed
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//Function for switching screens with buttons
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public void NextScreen()
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{
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UpdateListItemPositions();
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if (CurrentPage() < _pages - 1)
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{
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_lerp = true;
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_lerpTarget = _pageAnchorPositions[CurrentPage() + 1];
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PageChanged(CurrentPage() + 1);
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}
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}
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//Function for switching screens with buttons
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public void PreviousScreen()
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{
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UpdateListItemPositions();
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if (CurrentPage() > 0)
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{
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_lerp = true;
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_lerpTarget = _pageAnchorPositions[CurrentPage() - 1];
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PageChanged(CurrentPage() - 1);
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}
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}
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//Because the CurrentScreen function is not so reliable, these are the functions used for swipes
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private void NextScreenCommand()
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{
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if (_pageOnDragStart < _pages - 1)
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{
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int targetPage = Mathf.Min(_pages - 1, _pageOnDragStart + ItemsVisibleAtOnce);
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_lerp = true;
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_lerpTarget = _pageAnchorPositions[targetPage];
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|
|
||
|
|
PageChanged(targetPage);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//Because the CurrentScreen function is not so reliable, these are the functions used for swipes
|
||
|
|
private void PrevScreenCommand()
|
||
|
|
{
|
||
|
|
if (_pageOnDragStart > 0)
|
||
|
|
{
|
||
|
|
int targetPage = Mathf.Max(0, _pageOnDragStart - ItemsVisibleAtOnce);
|
||
|
|
_lerp = true;
|
||
|
|
|
||
|
|
_lerpTarget = _pageAnchorPositions[targetPage];
|
||
|
|
|
||
|
|
PageChanged(targetPage);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//returns the current screen that the is seeing
|
||
|
|
public int CurrentPage()
|
||
|
|
{
|
||
|
|
float pos;
|
||
|
|
|
||
|
|
if (direction == ScrollDirection.Horizontal)
|
||
|
|
{
|
||
|
|
pos = _listContainerMaxPosition - _listContainerTransform.localPosition.x;
|
||
|
|
pos = Mathf.Clamp(pos, 0, _listContainerSize);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pos = _listContainerTransform.localPosition.y - _listContainerMinPosition;
|
||
|
|
pos = Mathf.Clamp(pos, 0, _listContainerSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
float page = pos / _itemSize;
|
||
|
|
|
||
|
|
return Mathf.Clamp(Mathf.RoundToInt(page), 0, _pages);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Added to provide a uniform interface for the ScrollBarHelper
|
||
|
|
/// </summary>
|
||
|
|
public void SetLerp(bool value)
|
||
|
|
{
|
||
|
|
_lerp = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
public void ChangePage(int page)
|
||
|
|
{
|
||
|
|
if (0 <= page && page < _pages)
|
||
|
|
{
|
||
|
|
_lerp = true;
|
||
|
|
|
||
|
|
_lerpTarget = _pageAnchorPositions[page];
|
||
|
|
|
||
|
|
PageChanged(page);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//changes the bullets on the bottom of the page - pagination
|
||
|
|
private void PageChanged(int currentPage)
|
||
|
|
{
|
||
|
|
_startingPage = currentPage;
|
||
|
|
|
||
|
|
if (NextButton)
|
||
|
|
{
|
||
|
|
NextButton.interactable = currentPage < _pages - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (PrevButton)
|
||
|
|
{
|
||
|
|
PrevButton.interactable = currentPage > 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (onPageChange != null)
|
||
|
|
{
|
||
|
|
onPageChange(currentPage);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#region Interfaces
|
||
|
|
public void OnBeginDrag(PointerEventData eventData)
|
||
|
|
{
|
||
|
|
UpdateScrollbar(false);
|
||
|
|
|
||
|
|
_fastSwipeCounter = 0;
|
||
|
|
_fastSwipeTimer = true;
|
||
|
|
|
||
|
|
_positionOnDragStart = eventData.position;
|
||
|
|
_pageOnDragStart = CurrentPage();
|
||
|
|
}
|
||
|
|
|
||
|
|
public void OnEndDrag(PointerEventData eventData)
|
||
|
|
{
|
||
|
|
_startDrag = true;
|
||
|
|
float change = 0;
|
||
|
|
|
||
|
|
if (direction == ScrollDirection.Horizontal)
|
||
|
|
{
|
||
|
|
change = _positionOnDragStart.x - eventData.position.x;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
change = -_positionOnDragStart.y + eventData.position.y;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (UseFastSwipe)
|
||
|
|
{
|
||
|
|
fastSwipe = false;
|
||
|
|
_fastSwipeTimer = false;
|
||
|
|
|
||
|
|
if (_fastSwipeCounter <= _fastSwipeTarget)
|
||
|
|
{
|
||
|
|
if (Math.Abs(change) > FastSwipeThreshold)
|
||
|
|
{
|
||
|
|
fastSwipe = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (fastSwipe)
|
||
|
|
{
|
||
|
|
if (change > 0)
|
||
|
|
{
|
||
|
|
NextScreenCommand();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
PrevScreenCommand();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_lerp = true;
|
||
|
|
_lerpTarget = _pageAnchorPositions[CurrentPage()];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_lerp = true;
|
||
|
|
_lerpTarget = _pageAnchorPositions[CurrentPage()];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public void OnDrag(PointerEventData eventData)
|
||
|
|
{
|
||
|
|
_lerp = false;
|
||
|
|
|
||
|
|
if (_startDrag)
|
||
|
|
{
|
||
|
|
OnBeginDrag(eventData);
|
||
|
|
_startDrag = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public void StartScreenChange() { }
|
||
|
|
#endregion
|
||
|
|
}
|
||
|
|
}
|