441 lines
15 KiB
C#
441 lines
15 KiB
C#
/// 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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using System;
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using UnityEngine.Events;
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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[RequireComponent(typeof(ScrollRect))]
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[AddComponentMenu("Layout/Extensions/Vertical Scroll Snap")]
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public class VerticalScrollSnap : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
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{
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private Transform _screensContainer;
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private int _screens = 1;
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private bool _fastSwipeTimer = false;
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private int _fastSwipeCounter = 0;
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private int _fastSwipeTarget = 30;
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private System.Collections.Generic.List<Vector3> _positions;
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private ScrollRect _scroll_rect;
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private Vector3 _lerp_target;
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private bool _lerp;
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[Serializable]
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public class SelectionChangeStartEvent : UnityEvent { }
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[Serializable]
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public class SelectionChangeEndEvent : UnityEvent { }
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[Tooltip("The gameobject that contains toggles which suggest pagination. (optional)")]
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public GameObject Pagination;
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[Tooltip("Button to go to the next page. (optional)")]
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public GameObject NextButton;
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[Tooltip("Button to go to the previous page. (optional)")]
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public GameObject PrevButton;
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[Tooltip("Transition speed between pages. (optional)")]
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public float transitionSpeed = 7.5f;
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public Boolean UseFastSwipe = true;
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public int FastSwipeThreshold = 100;
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private bool _startDrag = true;
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private Vector3 _startPosition = new Vector3();
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[Tooltip("The currently active page")]
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private int _currentScreen;
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[Tooltip("The screen / page to start the control on")]
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[SerializeField]
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public int StartingScreen = 1;
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[Tooltip("The distance between two pages based on page height, by default pages are next to each other")]
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[SerializeField]
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[Range(1, 8)]
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public float PageStep = 1;
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public int CurrentPage
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{
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get
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{
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return _currentScreen;
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}
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}
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[SerializeField]
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private SelectionChangeStartEvent m_OnSelectionChangeStartEvent = new SelectionChangeStartEvent();
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public SelectionChangeStartEvent OnSelectionChangeStartEvent { get { return m_OnSelectionChangeStartEvent; } set { m_OnSelectionChangeStartEvent = value; } }
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[SerializeField]
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private SelectionChangeEndEvent m_OnSelectionChangeEndEvent = new SelectionChangeEndEvent();
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public SelectionChangeEndEvent OnSelectionChangeEndEvent { get { return m_OnSelectionChangeEndEvent; } set { m_OnSelectionChangeEndEvent = value; } }
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// Use this for initialization
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void Awake()
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{
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_scroll_rect = gameObject.GetComponent<ScrollRect>();
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if (_scroll_rect.horizontalScrollbar || _scroll_rect.verticalScrollbar)
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{
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Debug.LogWarning("Warning, using scrollbars with the Scroll Snap controls is not advised as it causes unpredictable results");
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}
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_screensContainer = _scroll_rect.content;
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DistributePages();
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if (NextButton)
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NextButton.GetComponent<Button>().onClick.AddListener(() => { NextScreen(); });
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if (PrevButton)
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PrevButton.GetComponent<Button>().onClick.AddListener(() => { PreviousScreen(); });
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}
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void Start()
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{
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UpdateChildPositions();
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_lerp = false;
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_currentScreen = StartingScreen - 1;
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_scroll_rect.verticalNormalizedPosition = (float)(_currentScreen) / (float)(_screens - 1);
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ChangeBulletsInfo(_currentScreen);
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}
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void Update()
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{
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if (_lerp)
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{
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_screensContainer.localPosition = Vector3.Lerp(_screensContainer.localPosition, _lerp_target, transitionSpeed * Time.deltaTime);
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if (Vector3.Distance(_screensContainer.localPosition, _lerp_target) < 0.1f)
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{
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_lerp = false;
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EndScreenChange();
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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(_screensContainer.localPosition, _lerp_target) < 10f)
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{
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ChangeBulletsInfo(CurrentScreen());
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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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if (_currentScreen < _screens - 1)
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{
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StartScreenChange();
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_lerp = true;
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_currentScreen++;
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_lerp_target = _positions[_currentScreen];
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ChangeBulletsInfo(_currentScreen);
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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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if (_currentScreen > 0)
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{
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StartScreenChange();
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_lerp = true;
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_currentScreen--;
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_lerp_target = _positions[_currentScreen];
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ChangeBulletsInfo(_currentScreen);
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}
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}
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/// <summary>
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/// Function for switching to a specific screen
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/// *Note, this is based on a 0 starting index - 0 to x
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/// </summary>
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/// <param name="screenIndex">0 starting index of page to jump to</param>
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public void GoToScreen(int screenIndex)
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{
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if (screenIndex <= _screens - 1 && screenIndex >= 0)
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{
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StartScreenChange();
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_lerp = true;
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_currentScreen = screenIndex;
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_lerp_target = _positions[_currentScreen];
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ChangeBulletsInfo(_currentScreen);
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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 (_currentScreen < _screens - 1)
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{
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_lerp = true;
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_currentScreen++;
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_lerp_target = _positions[_currentScreen];
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ChangeBulletsInfo(_currentScreen);
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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 PrevScreenCommand()
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{
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if (_currentScreen > 0)
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{
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_lerp = true;
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_currentScreen--;
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_lerp_target = _positions[_currentScreen];
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ChangeBulletsInfo(_currentScreen);
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}
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}
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//find the closest registered point to the releasing point
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private Vector3 FindClosestFrom(Vector3 start, System.Collections.Generic.List<Vector3> positions)
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{
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Vector3 closest = Vector3.zero;
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float distance = Mathf.Infinity;
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foreach (Vector3 position in _positions)
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{
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if (Vector3.Distance(start, position) < distance)
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{
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distance = Vector3.Distance(start, position);
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closest = position;
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}
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}
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return closest;
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}
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//returns the current screen that the is seeing
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public int CurrentScreen()
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{
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var pos = FindClosestFrom(_screensContainer.localPosition, _positions);
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return _currentScreen = GetPageforPosition(pos);
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}
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//changes the bullets on the bottom of the page - pagination
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private void ChangeBulletsInfo(int currentScreen)
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{
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if (Pagination)
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for (int i = 0; i < Pagination.transform.childCount; i++)
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{
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Pagination.transform.GetChild(i).GetComponent<Toggle>().isOn = (currentScreen == i)
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? true
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: false;
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}
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}
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//used for changing between screen resolutions
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public void DistributePages()
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{
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float _offset = 0;
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float _dimension = 0;
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Rect panelDimensions = gameObject.GetComponent<RectTransform>().rect;
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float currentYPosition = 0;
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var pageStepValue = (int)panelDimensions.height * ((PageStep == 0) ? 3 : PageStep);
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for (int i = 0; i < _screensContainer.transform.childCount; i++)
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{
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RectTransform child = _screensContainer.transform.GetChild(i).gameObject.GetComponent<RectTransform>();
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currentYPosition = _offset + i * pageStepValue;
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child.sizeDelta = new Vector2(panelDimensions.width, panelDimensions.height);
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child.anchoredPosition = new Vector2(0f, currentYPosition);
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child.anchorMin = new Vector2(child.anchorMin.x, 0f);
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child.anchorMax = new Vector2(child.anchorMax.x, 0f);
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child.pivot = new Vector2(child.pivot.x, 0f);
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}
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_dimension = currentYPosition + _offset * -1;
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_screensContainer.GetComponent<RectTransform>().offsetMax = new Vector2(0f, _dimension);
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}
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void UpdateChildPositions()
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{
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_screens = _screensContainer.childCount;
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_positions = new System.Collections.Generic.List<Vector3>();
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if (_screens > 0)
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{
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for (int i = 0; i < _screens; ++i)
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{
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_scroll_rect.verticalNormalizedPosition = (float)i / (float)(_screens - 1);
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_positions.Add(_screensContainer.localPosition);
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}
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}
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}
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int GetPageforPosition(Vector3 pos)
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{
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for (int i = 0; i < _positions.Count; i++)
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{
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if (_positions[i] == pos)
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{
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return i;
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}
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}
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return 0;
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}
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void OnValidate()
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{
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var childCount = gameObject.GetComponent<ScrollRect>().content.childCount;
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if (StartingScreen > childCount - 1)
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{
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StartingScreen = childCount - 1;
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}
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if (StartingScreen < 0)
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{
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StartingScreen = 0;
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}
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}
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/// <summary>
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/// Add a new child to this Scroll Snap and recalculate it's children
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/// </summary>
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/// <param name="GO">GameObject to add to the ScrollSnap</param>
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public void AddChild(GameObject GO)
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{
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_scroll_rect.verticalNormalizedPosition = 0;
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GO.transform.SetParent(_screensContainer);
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DistributePages();
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_scroll_rect.verticalNormalizedPosition = (float)(_currentScreen) / (_screens - 1);
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}
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/// <summary>
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/// Remove a new child to this Scroll Snap and recalculate it's children
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/// *Note, this is an index address (0-x)
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/// </summary>
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/// <param name="index"></param>
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/// <param name="ChildRemoved"></param>
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public void RemoveChild(int index, out GameObject ChildRemoved)
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{
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ChildRemoved = null;
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if (index < 0 || index > _screensContainer.childCount)
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{
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return;
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}
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_scroll_rect.verticalNormalizedPosition = 0;
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var children = _screensContainer.transform;
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int i = 0;
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foreach (Transform child in children)
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{
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if (i == index)
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{
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child.SetParent(null);
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ChildRemoved = child.gameObject;
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break;
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}
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i++;
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}
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DistributePages();
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if (_currentScreen > _screens - 1)
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{
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_currentScreen = _screens - 1;
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}
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_scroll_rect.verticalNormalizedPosition = (float)(_currentScreen) / (_screens - 1);
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}
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private void StartScreenChange()
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{
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OnSelectionChangeStartEvent.Invoke();
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}
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private void EndScreenChange()
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{
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OnSelectionChangeEndEvent.Invoke();
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}
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#region Interfaces
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public void OnBeginDrag(PointerEventData eventData)
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{
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if (!_fastSwipeTimer) StartScreenChange();
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_startPosition = _screensContainer.localPosition;
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_fastSwipeCounter = 0;
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_fastSwipeTimer = true;
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_currentScreen = CurrentScreen();
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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//transform.GetComponent<RectTransform>().pivot = new Vector2(0.5f, 0.5f);
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_startDrag = true;
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if (_scroll_rect.vertical)
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{
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if (UseFastSwipe)
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{
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fastSwipe = false;
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_fastSwipeTimer = false;
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if (_fastSwipeCounter <= _fastSwipeTarget)
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{
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if (Math.Abs(_startPosition.y - _screensContainer.localPosition.y) > FastSwipeThreshold)
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{
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fastSwipe = true;
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}
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}
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if (fastSwipe)
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{
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if (_startPosition.y - _screensContainer.localPosition.y > 0)
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{
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NextScreenCommand();
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}
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else
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{
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PrevScreenCommand();
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}
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}
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else
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{
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_lerp = true;
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_lerp_target = FindClosestFrom(_screensContainer.localPosition, _positions);
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_currentScreen = GetPageforPosition(_lerp_target);
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}
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}
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else
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{
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_lerp = true;
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_lerp_target = FindClosestFrom(_screensContainer.localPosition, _positions);
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_currentScreen = GetPageforPosition(_lerp_target);
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}
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}
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}
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public void OnDrag(PointerEventData eventData)
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{
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_lerp = false;
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if (_startDrag)
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{
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OnBeginDrag(eventData);
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_startDrag = false;
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}
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}
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#endregion
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}
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} |