377 lines
14 KiB
C#
377 lines
14 KiB
C#
///Credit perchik
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///Sourced from - http://forum.unity3d.com/threads/receive-onclick-event-and-pass-it-on-to-lower-ui-elements.293642/
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using System.Collections.Generic;
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using System.Linq;
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namespace UnityEngine.UI.Extensions
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{
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[RequireComponent(typeof(RectTransform))]
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[AddComponentMenu("UI/Extensions/ComboBox/ComboBox")]
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public class ComboBox : MonoBehaviour
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{
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public DropDownListItem SelectedItem { get; private set; }
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[Header("Combo Box Items")]
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public List<string> AvailableOptions;
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[Header("Properties")]
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[SerializeField]
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private bool isActive = true;
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[SerializeField]
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private float _scrollBarWidth = 20.0f;
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[SerializeField]
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private int _itemsToDisplay;
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[SerializeField]
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private float dropdownOffset;
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[SerializeField]
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private bool _displayPanelAbove = false;
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public bool SelectFirstItemOnStart = false;
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[SerializeField]
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private int selectItemIndexOnStart = 0;
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private bool shouldSelectItemOnStart => SelectFirstItemOnStart || selectItemIndexOnStart > 0;
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[System.Serializable]
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public class SelectionChangedEvent : Events.UnityEvent<string> { }
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[Header("Events")]
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// fires when item is changed;
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public SelectionChangedEvent OnSelectionChanged;
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[System.Serializable]
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public class ControlDisabledEvent : Events.UnityEvent<bool> { }
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// fires when item is changed;
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public ControlDisabledEvent OnControlDisabled;
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//private bool isInitialized = false;
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private bool _isPanelActive = false;
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private bool _hasDrawnOnce = false;
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private InputField _mainInput;
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private RectTransform _inputRT;
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private RectTransform _rectTransform;
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private RectTransform _overlayRT;
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private RectTransform _scrollPanelRT;
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private RectTransform _scrollBarRT;
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private RectTransform _slidingAreaRT;
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private RectTransform _scrollHandleRT;
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private RectTransform _itemsPanelRT;
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private Canvas _canvas;
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private RectTransform _canvasRT;
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private ScrollRect _scrollRect;
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private List<string> _panelItems; //items that will get shown in the drop-down
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private Dictionary<string, GameObject> panelObjects;
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private GameObject itemTemplate;
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private bool _initialized;
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public string Text { get; private set; }
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public float ScrollBarWidth
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{
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get { return _scrollBarWidth; }
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set
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{
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_scrollBarWidth = value;
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RedrawPanel();
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}
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}
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public int ItemsToDisplay
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{
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get { return _itemsToDisplay; }
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set
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{
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_itemsToDisplay = value;
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RedrawPanel();
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}
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}
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public void Awake()
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{
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Initialize();
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}
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public void Start()
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{
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if (shouldSelectItemOnStart && AvailableOptions.Count > 0)
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{
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SelectItemIndex(SelectFirstItemOnStart ? 0 : selectItemIndexOnStart);
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}
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RedrawPanel();
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}
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private bool Initialize()
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{
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if (_initialized) return true;
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bool success = true;
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try
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{
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_rectTransform = GetComponent<RectTransform>();
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_inputRT = _rectTransform.Find("InputField").GetComponent<RectTransform>();
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_mainInput = _inputRT.GetComponent<InputField>();
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_overlayRT = _rectTransform.Find("Overlay").GetComponent<RectTransform>();
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_overlayRT.gameObject.SetActive(false);
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_scrollPanelRT = _overlayRT.Find("ScrollPanel").GetComponent<RectTransform>();
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_scrollBarRT = _scrollPanelRT.Find("Scrollbar").GetComponent<RectTransform>();
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_slidingAreaRT = _scrollBarRT.Find("SlidingArea").GetComponent<RectTransform>();
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_scrollHandleRT = _slidingAreaRT.Find("Handle").GetComponent<RectTransform>();
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_itemsPanelRT = _scrollPanelRT.Find("Items").GetComponent<RectTransform>();
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//itemPanelLayout = itemsPanelRT.gameObject.GetComponent<LayoutGroup>();
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_canvas = GetComponentInParent<Canvas>();
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_canvasRT = _canvas.GetComponent<RectTransform>();
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_scrollRect = _scrollPanelRT.GetComponent<ScrollRect>();
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_scrollRect.scrollSensitivity = _rectTransform.sizeDelta.y / 2;
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_scrollRect.movementType = ScrollRect.MovementType.Clamped;
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_scrollRect.content = _itemsPanelRT;
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itemTemplate = _rectTransform.Find("ItemTemplate").gameObject;
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itemTemplate.SetActive(false);
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}
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catch (System.NullReferenceException ex)
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{
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Debug.LogException(ex);
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Debug.LogError("Something is setup incorrectly with the dropdownlist component causing a Null Reference Exception");
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success = false;
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}
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panelObjects = new Dictionary<string, GameObject>();
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_panelItems = AvailableOptions.ToList();
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_initialized = true;
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RebuildPanel();
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return success;
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}
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/// <summary>
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/// Update the drop down selection to a specific index
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/// </summary>
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/// <param name="index"></param>
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public void SelectItemIndex(int index)
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{
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ToggleDropdownPanel(false);
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OnItemClicked(AvailableOptions[index]);
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}
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public void AddItem(string item)
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{
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AvailableOptions.Add(item);
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RebuildPanel();
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}
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public void RemoveItem(string item)
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{
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AvailableOptions.Remove(item);
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RebuildPanel();
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}
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public void SetAvailableOptions(List<string> newOptions)
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{
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var uniqueOptions = newOptions.Distinct().ToArray();
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SetAvailableOptions(uniqueOptions);
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}
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public void SetAvailableOptions(string[] newOptions)
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{
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var uniqueOptions = newOptions.Distinct().ToList();
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if (newOptions.Length != uniqueOptions.Count)
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{
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Debug.LogWarning($"{nameof(ComboBox)}.{nameof(SetAvailableOptions)}: items may only exists once. {newOptions.Length - uniqueOptions.Count} duplicates.");
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}
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this.AvailableOptions.Clear();
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for (int i = 0; i < newOptions.Length; i++)
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{
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this.AvailableOptions.Add(newOptions[i]);
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}
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this.RebuildPanel();
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this.RedrawPanel();
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}
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public void ResetItems()
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{
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AvailableOptions.Clear();
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RebuildPanel();
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RedrawPanel();
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}
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/// <summary>
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/// Rebuilds the contents of the panel in response to items being added.
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/// </summary>
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private void RebuildPanel()
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{
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if (!_initialized)
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{
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Start();
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}
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//panel starts with all options
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_panelItems.Clear();
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foreach (string option in AvailableOptions)
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{
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_panelItems.Add(option.ToLower());
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}
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List<GameObject> itemObjs = new List<GameObject>(panelObjects.Values);
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panelObjects.Clear();
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int indx = 0;
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while (itemObjs.Count < AvailableOptions.Count)
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{
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GameObject newItem = Instantiate(itemTemplate) as GameObject;
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newItem.name = "Item " + indx;
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newItem.transform.SetParent(_itemsPanelRT, false);
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itemObjs.Add(newItem);
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indx++;
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}
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for (int i = 0; i < itemObjs.Count; i++)
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{
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itemObjs[i].SetActive(i <= AvailableOptions.Count);
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if (i < AvailableOptions.Count)
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{
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itemObjs[i].name = "Item " + i + " " + _panelItems[i];
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#if UNITY_2022_1_OR_NEWER
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itemObjs[i].transform.Find("Text").GetComponent<TMPro.TMP_Text>().text = AvailableOptions[i]; //set the text value
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#else
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itemObjs[i].transform.Find("Text").GetComponent<Text>().text = AvailableOptions[i]; //set the text value
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#endif
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Button itemBtn = itemObjs[i].GetComponent<Button>();
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itemBtn.onClick.RemoveAllListeners();
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string textOfItem = _panelItems[i]; //has to be copied for anonymous function or it gets garbage collected away
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itemBtn.onClick.AddListener(() =>
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{
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OnItemClicked(textOfItem);
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});
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panelObjects[_panelItems[i]] = itemObjs[i];
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}
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}
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}
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/// <summary>
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/// what happens when an item in the list is selected
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/// </summary>
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/// <param name="item"></param>
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private void OnItemClicked(string item)
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{
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//Debug.Log("item " + item + " clicked");
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Text = item;
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_mainInput.text = Text;
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ToggleDropdownPanel(true);
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}
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private void RedrawPanel()
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{
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float scrollbarWidth = _panelItems.Count > ItemsToDisplay ? _scrollBarWidth : 0f;//hide the scrollbar if there's not enough items
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_scrollBarRT.gameObject.SetActive(_panelItems.Count > ItemsToDisplay);
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float dropdownHeight = _itemsToDisplay > 0 ? _rectTransform.sizeDelta.y * Mathf.Min(_itemsToDisplay, _panelItems.Count) : _rectTransform.sizeDelta.y * _panelItems.Count;
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dropdownHeight += dropdownOffset;
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if (!_hasDrawnOnce || _rectTransform.sizeDelta != _inputRT.sizeDelta)
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{
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_hasDrawnOnce = true;
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_inputRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, _rectTransform.sizeDelta.x);
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_inputRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, _rectTransform.sizeDelta.y);
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var itemsRemaining = _panelItems.Count - ItemsToDisplay;
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itemsRemaining = itemsRemaining < 0 ? 0 : itemsRemaining;
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_scrollPanelRT.SetParent(transform, true);
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_scrollPanelRT.anchoredPosition = _displayPanelAbove ?
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new Vector2(0, dropdownOffset + dropdownHeight) :
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new Vector2(0, -(dropdownOffset + _rectTransform.sizeDelta.y));
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//make the overlay fill the screen
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_overlayRT.SetParent(_canvas.transform, false);
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_overlayRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, _canvasRT.sizeDelta.x);
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_overlayRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, _canvasRT.sizeDelta.y);
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_overlayRT.SetParent(transform, true);
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_scrollPanelRT.SetParent(_overlayRT, true);
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}
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if (_panelItems.Count < 1) return;
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_scrollPanelRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, dropdownHeight);
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_scrollPanelRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, _rectTransform.sizeDelta.x);
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_itemsPanelRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, _scrollPanelRT.sizeDelta.x - scrollbarWidth - 5);
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_itemsPanelRT.anchoredPosition = new Vector2(5, 0);
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_scrollBarRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, scrollbarWidth);
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_scrollBarRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, dropdownHeight);
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if (scrollbarWidth == 0) _scrollHandleRT.gameObject.SetActive(false); else _scrollHandleRT.gameObject.SetActive(true);
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_slidingAreaRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, 0);
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_slidingAreaRT.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, dropdownHeight - _scrollBarRT.sizeDelta.x);
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}
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public void OnValueChanged(string currText)
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{
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Text = currText;
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RedrawPanel();
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if (_panelItems.Count == 0)
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{
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_isPanelActive = true;//this makes it get turned off
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ToggleDropdownPanel(false);
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}
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else if (!_isPanelActive)
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{
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ToggleDropdownPanel(false);
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}
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OnSelectionChanged.Invoke(Text);
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}
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/// <summary>
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/// Toggle the drop down list
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/// </summary>
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/// <param name="directClick"> whether an item was directly clicked on</param>
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public void ToggleDropdownPanel(bool directClick)
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{
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if (!isActive) return;
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_isPanelActive = !_isPanelActive;
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_overlayRT.gameObject.SetActive(_isPanelActive);
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if (_isPanelActive)
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{
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transform.SetAsLastSibling();
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}
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else if (directClick)
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{
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// scrollOffset = Mathf.RoundToInt(itemsPanelRT.anchoredPosition.y / _rectTransform.sizeDelta.y);
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}
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}
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/// <summary>
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/// Updates the control and sets its active status, determines whether the dropdown will open ot not
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/// </summary>
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/// <param name="status"></param>
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public void SetActive(bool status)
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{
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if (status != isActive)
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{
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OnControlDisabled?.Invoke(status);
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}
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isActive = status;
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}
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}
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}
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