105 lines
3.2 KiB
C#
105 lines
3.2 KiB
C#
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using System;
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using System.Collections;
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.Events;
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using frame8.Logic.Misc.Other.Extensions;
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using frame8.Logic.Misc.Visual.UI;
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using frame8.Logic.Misc.Visual.UI.MonoBehaviours;
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using Com.ForbiddenByte.OSA.Core;
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namespace Com.ForbiddenByte.OSA.Util
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{
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/// <summary>
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/// Important note: if used with ScrollbarFixer8 (which is true in the most cases,
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/// make sure <see cref="ScrollbarFixer8.minSize"/> is not too small
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/// </summary>
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public class DiscreteScrollbar : MonoBehaviour
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{
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public RectTransform slotPrefab;
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public RectTransform slotsParent;
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public UnityIntEvent OnSlotSelected;
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public Func<int> getItemsCountFunc;
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Scrollbar _Scrollbar;
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RectTransform[] slots = new RectTransform[0];
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RectTransform _ScrollbarPanelRT;
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IScrollRectProxy _ScrollRectProxy;
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int _OneIfVert_ZeroIfHor;
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const int MAX_COUNT = 100;
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bool _UpdatePending;
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void Awake()
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{
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// Get in parent, but ignore self
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_ScrollRectProxy = transform.parent.GetComponentInParent<IScrollRectProxy>();
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if (_ScrollRectProxy == null)
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throw new OSAException(GetType().Name + ": No IScrollRectProxy component found in parent");
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_Scrollbar = GetComponent<Scrollbar>();
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_ScrollbarPanelRT = _Scrollbar.transform as RectTransform;
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_OneIfVert_ZeroIfHor = _ScrollRectProxy.IsHorizontal ? 0 : 1;
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}
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void OnEnable() { _UpdatePending = false; }
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public void OnScrollbarSizeChanged()
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{
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StartCoroutine(UpdateSize());
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}
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IEnumerator UpdateSize()
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{
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while (_UpdatePending) // wait for prev request to complete
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yield return null;
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_UpdatePending = true;
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yield return null;
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if (getItemsCountFunc == null)
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throw new OSAException(GetType().Name + "getItemsCountFunc==null. Please specify a count provider");
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_UpdatePending = true;
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int count = getItemsCountFunc();
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if (count > MAX_COUNT)
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throw new OSAException(GetType().Name + ": count is " + count + ". Bigger than MAX_COUNT=" + MAX_COUNT + ". Are you sure you want to use a discrete scrollbar?");
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Rebuild(count);
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_UpdatePending = false;
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}
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public void Rebuild(int numSlots)
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{
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slotPrefab.gameObject.SetActive(true);
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// Clear prev
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if (slots != null)
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foreach (var slot in slots)
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Destroy(slot.gameObject);
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// Add new
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slots = new RectTransform[numSlots];
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float sizesCumu = 0;
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float slotSize = _ScrollbarPanelRT.rect.size[_OneIfVert_ZeroIfHor] / numSlots; // not using the handle's size because of rounding errors with higher <numSlots>
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RectTransform.Edge edgeToInsetFrom = _OneIfVert_ZeroIfHor == 1 ? RectTransform.Edge.Top : RectTransform.Edge.Left;
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for (int i = 0; i < numSlots; i++)
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{
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var slot = (Instantiate(slotPrefab.gameObject) as GameObject).GetComponent<RectTransform>();
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slots[i] = slot;
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slot.SetParent(slotsParent, false);
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slot.SetInsetAndSizeFromParentEdgeWithCurrentAnchors(edgeToInsetFrom, sizesCumu, slotSize);
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sizesCumu += slotSize;
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int copyOfI = i;
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slot.GetComponentInChildren<Button>().onClick.AddListener(() => { if (OnSlotSelected != null) OnSlotSelected.Invoke(copyOfI); });
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}
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slotPrefab.gameObject.SetActive(false);
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}
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[Serializable]
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public class UnityIntEvent : UnityEvent<int> { }
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}
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}
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