using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

namespace MuHua {
	/// <summary>
	/// 文本输入字段
	/// </summary>
	public class UITextField : TextField {
		public new class UxmlFactory : UxmlFactory<UITextField, UxmlTraits> { }
		public new class UxmlTraits : TextField.UxmlTraits {
			public UxmlStringAttributeDescription DefaultPrompt = new UxmlStringAttributeDescription {
				name = "default-prompt"
			};
			public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc) {
				UITextField textField = (UITextField)ve;
				textField.DefaultPrompt = DefaultPrompt.GetValueFromBag(bag, cc);
				textField.SetDefaultPrompt();
				base.Init(ve, bag, cc);
			}
		}
		public string DefaultPrompt { get; set; }

		public VisualElement inputElement => this.Q<VisualElement>("unity-text-input");
		public VisualElement textElement => inputElement.Q<VisualElement>("");

		public UITextField() {
			ClearClassList();
			AddToClassList("input-field");

			labelElement.ClearClassList();
			labelElement.AddToClassList("unity-text-element");
			labelElement.AddToClassList("input-field-label");

			inputElement.ClearClassList();
			inputElement.AddToClassList("input-field-box");

			textElement.ClearClassList();
			textElement.AddToClassList("unity-text-element");
			textElement.AddToClassList("input-field-text");

			RegisterCallback<FocusInEvent>((evt) => { PrepareInput(); });
			RegisterCallback<FocusOutEvent>((evt) => { SetDefaultPrompt(); });
		}
		public void PrepareInput() {
			textElement.RemoveFromClassList("input-field-text-d");
			if (text != DefaultPrompt) { return; }
			text = "";
		}
		public void SetDefaultPrompt() {
			textElement.RemoveFromClassList("input-field-text-d");
			if (value != "") { return; }
			text = DefaultPrompt;
			textElement.AddToClassList("input-field-text-d");
		}
	}
}