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654 lines
23 KiB
654 lines
23 KiB
using System;
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using System.Collections;
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using System.Collections.Generic;
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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 UnityEngine.EventSystems;
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using UnityEngine.UI.CoroutineTween;
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namespace TMPro
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{
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[AddComponentMenu("UI/TMP Dropdown", 35)]
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[RequireComponent(typeof(RectTransform))]
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public class TMP_Dropdown : Selectable, IPointerClickHandler, ISubmitHandler, ICancelHandler
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{
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protected internal class DropdownItem : MonoBehaviour, IPointerEnterHandler, ICancelHandler
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{
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[SerializeField]
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private TMP_Text m_Text;
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[SerializeField]
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private Image m_Image;
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[SerializeField]
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private RectTransform m_RectTransform;
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[SerializeField]
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private Toggle m_Toggle;
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public TMP_Text text { get { return m_Text; } set { m_Text = value; } }
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public Image image { get { return m_Image; } set { m_Image = value; } }
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public RectTransform rectTransform { get { return m_RectTransform; } set { m_RectTransform = value; } }
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public Toggle toggle { get { return m_Toggle; } set { m_Toggle = value; } }
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public virtual void OnPointerEnter(PointerEventData eventData)
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{
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EventSystem.current.SetSelectedGameObject(gameObject);
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}
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public virtual void OnCancel(BaseEventData eventData)
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{
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TMP_Dropdown dropdown = GetComponentInParent<TMP_Dropdown>();
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if (dropdown)
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dropdown.Hide();
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}
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}
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[Serializable]
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public class OptionData
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{
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[SerializeField]
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private string m_Text;
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[SerializeField]
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private Sprite m_Image;
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public string text { get { return m_Text; } set { m_Text = value; } }
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public Sprite image { get { return m_Image; } set { m_Image = value; } }
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public OptionData()
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{
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}
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public OptionData(string text)
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{
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this.text = text;
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}
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public OptionData(Sprite image)
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{
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this.image = image;
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}
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public OptionData(string text, Sprite image)
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{
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this.text = text;
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this.image = image;
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}
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}
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[Serializable]
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public class OptionDataList
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{
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[SerializeField]
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private List<OptionData> m_Options;
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public List<OptionData> options { get { return m_Options; } set { m_Options = value; } }
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public OptionDataList()
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{
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options = new List<OptionData>();
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}
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}
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[Serializable]
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public class DropdownEvent : UnityEvent<int> { }
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// Template used to create the dropdown.
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[SerializeField]
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private RectTransform m_Template;
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public RectTransform template { get { return m_Template; } set { m_Template = value; RefreshShownValue(); } }
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// Text to be used as a caption for the current value. It's not required, but it's kept here for convenience.
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[SerializeField]
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private TMP_Text m_CaptionText;
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public TMP_Text captionText { get { return m_CaptionText; } set { m_CaptionText = value; RefreshShownValue(); } }
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[SerializeField]
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private Image m_CaptionImage;
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public Image captionImage { get { return m_CaptionImage; } set { m_CaptionImage = value; RefreshShownValue(); } }
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[Space]
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[SerializeField]
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private TMP_Text m_ItemText;
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public TMP_Text itemText { get { return m_ItemText; } set { m_ItemText = value; RefreshShownValue(); } }
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[SerializeField]
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private Image m_ItemImage;
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public Image itemImage { get { return m_ItemImage; } set { m_ItemImage = value; RefreshShownValue(); } }
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[Space]
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[SerializeField]
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private int m_Value;
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[Space]
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// Items that will be visible when the dropdown is shown.
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// We box this into its own class so we can use a Property Drawer for it.
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[SerializeField]
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private OptionDataList m_Options = new OptionDataList();
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public List<OptionData> options
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{
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get { return m_Options.options; }
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set { m_Options.options = value; RefreshShownValue(); }
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}
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[Space]
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// Notification triggered when the dropdown changes.
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[SerializeField]
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private DropdownEvent m_OnValueChanged = new DropdownEvent();
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public DropdownEvent onValueChanged { get { return m_OnValueChanged; } set { m_OnValueChanged = value; } }
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private GameObject m_Dropdown;
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private GameObject m_Blocker;
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private List<DropdownItem> m_Items = new List<DropdownItem>();
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private TweenRunner<FloatTween> m_AlphaTweenRunner;
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private bool validTemplate = false;
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private static OptionData s_NoOptionData = new OptionData();
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// Current value.
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public int value
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{
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get
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{
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return m_Value;
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}
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set
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{
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if (Application.isPlaying && (value == m_Value || options.Count == 0))
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return;
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m_Value = Mathf.Clamp(value, 0, options.Count - 1);
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RefreshShownValue();
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// Notify all listeners
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m_OnValueChanged.Invoke(m_Value);
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}
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}
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public bool IsExpanded
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{ get { return m_Dropdown != null; } }
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protected TMP_Dropdown()
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{ }
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protected override void Awake()
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{
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#if UNITY_EDITOR
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if (!Application.isPlaying)
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return;
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#endif
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m_AlphaTweenRunner = new TweenRunner<FloatTween>();
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m_AlphaTweenRunner.Init(this);
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if (m_CaptionImage)
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m_CaptionImage.enabled = (m_CaptionImage.sprite != null);
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if (m_Template)
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m_Template.gameObject.SetActive(false);
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}
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#if UNITY_EDITOR
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protected override void OnValidate()
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{
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base.OnValidate();
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if (!IsActive())
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return;
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RefreshShownValue();
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}
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#endif
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public void RefreshShownValue()
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{
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OptionData data = s_NoOptionData;
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if (options.Count > 0)
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data = options[Mathf.Clamp(m_Value, 0, options.Count - 1)];
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if (m_CaptionText)
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{
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if (data != null && data.text != null)
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m_CaptionText.text = data.text;
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else
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m_CaptionText.text = "";
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}
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if (m_CaptionImage)
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{
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if (data != null)
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m_CaptionImage.sprite = data.image;
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else
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m_CaptionImage.sprite = null;
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m_CaptionImage.enabled = (m_CaptionImage.sprite != null);
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}
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}
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public void AddOptions(List<OptionData> options)
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{
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this.options.AddRange(options);
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RefreshShownValue();
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}
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public void AddOptions(List<string> options)
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{
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for (int i = 0; i < options.Count; i++)
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this.options.Add(new OptionData(options[i]));
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RefreshShownValue();
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}
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public void AddOptions(List<Sprite> options)
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{
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for (int i = 0; i < options.Count; i++)
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this.options.Add(new OptionData(options[i]));
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RefreshShownValue();
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}
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public void ClearOptions()
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{
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options.Clear();
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RefreshShownValue();
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}
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private void SetupTemplate()
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{
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validTemplate = false;
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if (!m_Template)
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{
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Debug.LogError("The dropdown template is not assigned. The template needs to be assigned and must have a child GameObject with a Toggle component serving as the item.", this);
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return;
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}
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GameObject templateGo = m_Template.gameObject;
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templateGo.SetActive(true);
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Toggle itemToggle = m_Template.GetComponentInChildren<Toggle>();
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validTemplate = true;
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if (!itemToggle || itemToggle.transform == template)
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{
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validTemplate = false;
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Debug.LogError("The dropdown template is not valid. The template must have a child GameObject with a Toggle component serving as the item.", template);
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}
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else if (!(itemToggle.transform.parent is RectTransform))
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{
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validTemplate = false;
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Debug.LogError("The dropdown template is not valid. The child GameObject with a Toggle component (the item) must have a RectTransform on its parent.", template);
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}
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else if (itemText != null && !itemText.transform.IsChildOf(itemToggle.transform))
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{
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validTemplate = false;
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Debug.LogError("The dropdown template is not valid. The Item Text must be on the item GameObject or children of it.", template);
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}
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else if (itemImage != null && !itemImage.transform.IsChildOf(itemToggle.transform))
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{
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validTemplate = false;
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Debug.LogError("The dropdown template is not valid. The Item Image must be on the item GameObject or children of it.", template);
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}
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if (!validTemplate)
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{
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templateGo.SetActive(false);
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return;
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}
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DropdownItem item = itemToggle.gameObject.AddComponent<DropdownItem>();
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item.text = m_ItemText;
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item.image = m_ItemImage;
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item.toggle = itemToggle;
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item.rectTransform = (RectTransform)itemToggle.transform;
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Canvas popupCanvas = GetOrAddComponent<Canvas>(templateGo);
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popupCanvas.overrideSorting = true;
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popupCanvas.sortingOrder = 30000;
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GetOrAddComponent<GraphicRaycaster>(templateGo);
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GetOrAddComponent<CanvasGroup>(templateGo);
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templateGo.SetActive(false);
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validTemplate = true;
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}
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private static T GetOrAddComponent<T>(GameObject go) where T : Component
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{
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T comp = go.GetComponent<T>();
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if (!comp)
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comp = go.AddComponent<T>();
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return comp;
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}
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public virtual void OnPointerClick(PointerEventData eventData)
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{
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Show();
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}
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public virtual void OnSubmit(BaseEventData eventData)
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{
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Show();
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}
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public virtual void OnCancel(BaseEventData eventData)
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{
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Hide();
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}
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// Show the dropdown.
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//
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// Plan for dropdown scrolling to ensure dropdown is contained within screen.
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//
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// We assume the Canvas is the screen that the dropdown must be kept inside.
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// This is always valid for screen space canvas modes.
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// For world space canvases we don't know how it's used, but it could be e.g. for an in-game monitor.
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// We consider it a fair constraint that the canvas must be big enough to contains dropdowns.
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public void Show()
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{
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if (!IsActive() || !IsInteractable() || m_Dropdown != null)
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return;
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if (!validTemplate)
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{
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SetupTemplate();
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if (!validTemplate)
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return;
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}
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// Get root Canvas.
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var list = TMP_ListPool<Canvas>.Get();
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gameObject.GetComponentsInParent(false, list);
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if (list.Count == 0)
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return;
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Canvas rootCanvas = list[0];
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TMP_ListPool<Canvas>.Release(list);
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m_Template.gameObject.SetActive(true);
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// Instantiate the drop-down template
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m_Dropdown = CreateDropdownList(m_Template.gameObject);
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m_Dropdown.name = "Dropdown List";
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m_Dropdown.SetActive(true);
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// Make drop-down RectTransform have same values as original.
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RectTransform dropdownRectTransform = m_Dropdown.transform as RectTransform;
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dropdownRectTransform.SetParent(m_Template.transform.parent, false);
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// Instantiate the drop-down list items
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// Find the dropdown item and disable it.
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DropdownItem itemTemplate = m_Dropdown.GetComponentInChildren<DropdownItem>();
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GameObject content = itemTemplate.rectTransform.parent.gameObject;
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RectTransform contentRectTransform = content.transform as RectTransform;
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itemTemplate.rectTransform.gameObject.SetActive(true);
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// Get the rects of the dropdown and item
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Rect dropdownContentRect = contentRectTransform.rect;
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Rect itemTemplateRect = itemTemplate.rectTransform.rect;
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// Calculate the visual offset between the item's edges and the background's edges
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Vector2 offsetMin = itemTemplateRect.min - dropdownContentRect.min + (Vector2)itemTemplate.rectTransform.localPosition;
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Vector2 offsetMax = itemTemplateRect.max - dropdownContentRect.max + (Vector2)itemTemplate.rectTransform.localPosition;
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Vector2 itemSize = itemTemplateRect.size;
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m_Items.Clear();
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Toggle prev = null;
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for (int i = 0; i < options.Count; ++i)
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{
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OptionData data = options[i];
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DropdownItem item = AddItem(data, value == i, itemTemplate, m_Items);
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if (item == null)
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continue;
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// Automatically set up a toggle state change listener
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item.toggle.isOn = value == i;
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item.toggle.onValueChanged.AddListener(x => OnSelectItem(item.toggle));
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// Select current option
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if (item.toggle.isOn)
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item.toggle.Select();
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// Automatically set up explicit navigation
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if (prev != null)
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{
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Navigation prevNav = prev.navigation;
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Navigation toggleNav = item.toggle.navigation;
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prevNav.mode = Navigation.Mode.Explicit;
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toggleNav.mode = Navigation.Mode.Explicit;
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prevNav.selectOnDown = item.toggle;
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prevNav.selectOnRight = item.toggle;
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toggleNav.selectOnLeft = prev;
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toggleNav.selectOnUp = prev;
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prev.navigation = prevNav;
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item.toggle.navigation = toggleNav;
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}
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prev = item.toggle;
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}
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// Reposition all items now that all of them have been added
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Vector2 sizeDelta = contentRectTransform.sizeDelta;
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sizeDelta.y = itemSize.y * m_Items.Count + offsetMin.y - offsetMax.y;
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contentRectTransform.sizeDelta = sizeDelta;
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float extraSpace = dropdownRectTransform.rect.height - contentRectTransform.rect.height;
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if (extraSpace > 0)
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dropdownRectTransform.sizeDelta = new Vector2(dropdownRectTransform.sizeDelta.x, dropdownRectTransform.sizeDelta.y - extraSpace);
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// Invert anchoring and position if dropdown is partially or fully outside of canvas rect.
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// Typically this will have the effect of placing the dropdown above the button instead of below,
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// but it works as inversion regardless of initial setup.
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Vector3[] corners = new Vector3[4];
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dropdownRectTransform.GetWorldCorners(corners);
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RectTransform rootCanvasRectTransform = rootCanvas.transform as RectTransform;
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Rect rootCanvasRect = rootCanvasRectTransform.rect;
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for (int axis = 0; axis < 2; axis++)
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{
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bool outside = false;
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for (int i = 0; i < 4; i++)
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{
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Vector3 corner = rootCanvasRectTransform.InverseTransformPoint(corners[i]);
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if (corner[axis] < rootCanvasRect.min[axis] || corner[axis] > rootCanvasRect.max[axis])
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{
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outside = true;
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break;
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}
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}
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if (outside)
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RectTransformUtility.FlipLayoutOnAxis(dropdownRectTransform, axis, false, false);
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}
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for (int i = 0; i < m_Items.Count; i++)
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{
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RectTransform itemRect = m_Items[i].rectTransform;
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itemRect.anchorMin = new Vector2(itemRect.anchorMin.x, 0);
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itemRect.anchorMax = new Vector2(itemRect.anchorMax.x, 0);
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itemRect.anchoredPosition = new Vector2(itemRect.anchoredPosition.x, offsetMin.y + itemSize.y * (m_Items.Count - 1 - i) + itemSize.y * itemRect.pivot.y);
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itemRect.sizeDelta = new Vector2(itemRect.sizeDelta.x, itemSize.y);
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}
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// Fade in the popup
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AlphaFadeList(0.15f, 0f, 1f);
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// Make drop-down template and item template inactive
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m_Template.gameObject.SetActive(false);
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itemTemplate.gameObject.SetActive(false);
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m_Blocker = CreateBlocker(rootCanvas);
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}
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protected virtual GameObject CreateBlocker(Canvas rootCanvas)
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{
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// Create blocker GameObject.
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GameObject blocker = new GameObject("Blocker");
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// Setup blocker RectTransform to cover entire root canvas area.
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RectTransform blockerRect = blocker.AddComponent<RectTransform>();
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blockerRect.SetParent(rootCanvas.transform, false);
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blockerRect.anchorMin = Vector3.zero;
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blockerRect.anchorMax = Vector3.one;
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blockerRect.sizeDelta = Vector2.zero;
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// Make blocker be in separate canvas in same layer as dropdown and in layer just below it.
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Canvas blockerCanvas = blocker.AddComponent<Canvas>();
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blockerCanvas.overrideSorting = true;
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Canvas dropdownCanvas = m_Dropdown.GetComponent<Canvas>();
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blockerCanvas.sortingLayerID = dropdownCanvas.sortingLayerID;
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blockerCanvas.sortingOrder = dropdownCanvas.sortingOrder - 1;
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// Add raycaster since it's needed to block.
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blocker.AddComponent<GraphicRaycaster>();
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// Add image since it's needed to block, but make it clear.
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Image blockerImage = blocker.AddComponent<Image>();
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blockerImage.color = Color.clear;
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// Add button since it's needed to block, and to close the dropdown when blocking area is clicked.
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Button blockerButton = blocker.AddComponent<Button>();
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blockerButton.onClick.AddListener(Hide);
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return blocker;
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}
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protected virtual void DestroyBlocker(GameObject blocker)
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{
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Destroy(blocker);
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}
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protected virtual GameObject CreateDropdownList(GameObject template)
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{
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return (GameObject)Instantiate(template);
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}
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protected virtual void DestroyDropdownList(GameObject dropdownList)
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{
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Destroy(dropdownList);
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}
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protected virtual DropdownItem CreateItem(DropdownItem itemTemplate)
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{
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return (DropdownItem)Instantiate(itemTemplate);
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}
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protected virtual void DestroyItem(DropdownItem item)
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{
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// No action needed since destroying the dropdown list destroys all contained items as well.
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}
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// Add a new drop-down list item with the specified values.
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private DropdownItem AddItem(OptionData data, bool selected, DropdownItem itemTemplate, List<DropdownItem> items)
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{
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// Add a new item to the dropdown.
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DropdownItem item = CreateItem(itemTemplate);
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item.rectTransform.SetParent(itemTemplate.rectTransform.parent, false);
|
|
|
|
item.gameObject.SetActive(true);
|
|
item.gameObject.name = "Item " + items.Count + (data.text != null ? ": " + data.text : "");
|
|
|
|
if (item.toggle != null)
|
|
{
|
|
item.toggle.isOn = false;
|
|
}
|
|
|
|
// Set the item's data
|
|
if (item.text)
|
|
item.text.text = data.text;
|
|
if (item.image)
|
|
{
|
|
item.image.sprite = data.image;
|
|
item.image.enabled = (item.image.sprite != null);
|
|
}
|
|
|
|
items.Add(item);
|
|
return item;
|
|
}
|
|
|
|
private void AlphaFadeList(float duration, float alpha)
|
|
{
|
|
CanvasGroup group = m_Dropdown.GetComponent<CanvasGroup>();
|
|
AlphaFadeList(duration, group.alpha, alpha);
|
|
}
|
|
|
|
private void AlphaFadeList(float duration, float start, float end)
|
|
{
|
|
if (end.Equals(start))
|
|
return;
|
|
|
|
FloatTween tween = new FloatTween { duration = duration, startValue = start, targetValue = end };
|
|
tween.AddOnChangedCallback(SetAlpha);
|
|
tween.ignoreTimeScale = true;
|
|
m_AlphaTweenRunner.StartTween(tween);
|
|
}
|
|
|
|
private void SetAlpha(float alpha)
|
|
{
|
|
if (!m_Dropdown)
|
|
return;
|
|
CanvasGroup group = m_Dropdown.GetComponent<CanvasGroup>();
|
|
group.alpha = alpha;
|
|
}
|
|
|
|
// Hide the dropdown.
|
|
public void Hide()
|
|
{
|
|
if (m_Dropdown != null)
|
|
{
|
|
AlphaFadeList(0.15f, 0f);
|
|
|
|
// User could have disabled the dropdown during the OnValueChanged call.
|
|
if (IsActive())
|
|
StartCoroutine(DelayedDestroyDropdownList(0.15f));
|
|
}
|
|
if (m_Blocker != null)
|
|
DestroyBlocker(m_Blocker);
|
|
m_Blocker = null;
|
|
Select();
|
|
}
|
|
|
|
private IEnumerator DelayedDestroyDropdownList(float delay)
|
|
{
|
|
|
|
yield return new WaitForSecondsRealtime(delay);
|
|
|
|
for (int i = 0; i < m_Items.Count; i++)
|
|
{
|
|
if (m_Items[i] != null)
|
|
DestroyItem(m_Items[i]);
|
|
m_Items.Clear();
|
|
}
|
|
if (m_Dropdown != null)
|
|
DestroyDropdownList(m_Dropdown);
|
|
m_Dropdown = null;
|
|
}
|
|
|
|
// Change the value and hide the dropdown.
|
|
private void OnSelectItem(Toggle toggle)
|
|
{
|
|
if (!toggle.isOn)
|
|
toggle.isOn = true;
|
|
|
|
int selectedIndex = -1;
|
|
Transform tr = toggle.transform;
|
|
Transform parent = tr.parent;
|
|
for (int i = 0; i < parent.childCount; i++)
|
|
{
|
|
if (parent.GetChild(i) == tr)
|
|
{
|
|
// Subtract one to account for template child.
|
|
selectedIndex = i - 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (selectedIndex < 0)
|
|
return;
|
|
|
|
value = selectedIndex;
|
|
Hide();
|
|
}
|
|
}
|
|
}
|