327 lines
12 KiB
C#
327 lines
12 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")]
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public class ComboBox : MonoBehaviour
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{
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public Color disabledTextColor;
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public DropDownListItem SelectedItem { get; private set; } //outside world gets to get this, not set it
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public List<string> AvailableOptions;
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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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[System.Serializable]
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public class SelectionChangedEvent : UnityEngine.Events.UnityEvent<string>
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{
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}
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// fires when item is changed;
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public SelectionChangedEvent OnSelectionChanged;
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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 dropdown
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private Dictionary<string, GameObject> panelObjects;
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private GameObject itemTemplate;
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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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// private int scrollOffset; //offset of the selected item
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// private int _selectedIndex = 0;
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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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private bool Initialize()
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{
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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.FindChild("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 Refernece 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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RebuildPanel();
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//RedrawPanel(); - causes an initialisation failure in U5
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return success;
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}
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/* currently just using items in the list instead of being able to add to it.
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public void AddItems(params object[] list)
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{
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List<DropDownListItem> ddItems = new List<DropDownListItem>();
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foreach (var obj in list)
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{
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if (obj is DropDownListItem)
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{
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ddItems.Add((DropDownListItem)obj);
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}
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else if (obj is string)
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{
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ddItems.Add(new DropDownListItem(caption: (string)obj));
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}
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else if (obj is Sprite)
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{
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ddItems.Add(new DropDownListItem(image: (Sprite)obj));
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}
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else
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{
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throw new System.Exception("Only ComboBoxItems, Strings, and Sprite types are allowed");
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}
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}
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Items.AddRange(ddItems);
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Items = Items.Distinct().ToList();//remove any duplicates
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RebuildPanel();
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}
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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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//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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_panelItems.Sort();
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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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itemObjs[i].transform.Find("Text").GetComponent<Text>().text = _panelItems[i]; //set the text value
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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 UpdateSelected()
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//{
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// SelectedItem = (_selectedIndex > -1 && _selectedIndex < Items.Count) ? Items[_selectedIndex] : null;
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// if (SelectedItem == null) return;
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// bool hasImage = SelectedItem.Image != null;
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// if (hasImage)
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// {
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// mainButton.img.sprite = SelectedItem.Image;
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// mainButton.img.color = Color.white;
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// //if (Interactable) mainButton.img.color = Color.white;
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// //else mainButton.img.color = new Color(1, 1, 1, .5f);
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// }
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// else
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// {
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// mainButton.img.sprite = null;
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// }
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// mainButton.txt.text = SelectedItem.Caption;
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// //update selected index color
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// for (int i = 0; i < itemsPanelRT.childCount; i++)
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// {
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// panelItems[i].btnImg.color = (_selectedIndex == i) ? mainButton.btn.colors.highlightedColor : new Color(0, 0, 0, 0);
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// }
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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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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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_scrollPanelRT.SetParent(transform, true);//break the scroll panel from the overlay
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_scrollPanelRT.anchoredPosition = new Vector2(0, -_rectTransform.sizeDelta.y); //anchor it to the bottom of the button
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//make the overlay fill the screen
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_overlayRT.SetParent(_canvas.transform, false); //attach it to top level object
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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);//reattach to this object
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_scrollPanelRT.SetParent(_overlayRT, true); //reattach the scrollpanel to the overlay
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}
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if (_panelItems.Count < 1) return;
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float dropdownHeight = _rectTransform.sizeDelta.y * Mathf.Min(_itemsToDisplay, _panelItems.Count);
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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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_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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//Debug.Log("value changed to: " + currText);
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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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_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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}
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}
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