MuHua-123
126 lines
4.2 KiB
C#
126 lines
4.2 KiB
C#
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.UIElements;
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namespace MuHua {
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/// <summary>
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/// 下拉框
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/// </summary>
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public class UIDropdown<T> : ModuleUIPanel, IDisposable, UIControl {
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/// <summary> 绑定的画布 </summary>
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internal readonly VisualElement canvas;
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/// <summary> 下拉框容器 </summary>
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internal readonly VisualElement DropdownContainer;
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/// <summary> 下拉框滚动视图 </summary>
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internal readonly VisualElement DropdownScrollView;
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/// <summary> 选项模板 </summary>
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internal readonly VisualTreeAsset TemplateAsset;
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/// <summary> 值改变时 </summary>
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public event Action<T> ValueChanged;
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public T value;
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public List<T> list = new List<T>();
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internal UIScrollViewV scrollView;
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internal ModuleUIItems<UIDropdownItem, T> DropdownItems;
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/// <summary> 数据操作 </summary
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public T this[int index] => list[index];
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/// <summary> 总数 </summary
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public int Count => list.Count;
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internal Label Tag => Q<Label>("Tag");
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internal Label Title => Q<Label>("Title");
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internal VisualElement Input => Q<VisualElement>("Input");
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internal VisualElement Icon => Q<VisualElement>("Icon");
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internal VisualElement Positioner => Q<VisualElement>("Positioner");
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public UIDropdown(VisualElement element, VisualElement canvas, VisualTreeAsset TemplateAsset) : base(element) {
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this.canvas = canvas;
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this.TemplateAsset = TemplateAsset;
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DropdownContainer = new VisualElement();
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DropdownContainer.EnableInClassList("dropdown-container", true);
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DropdownContainer.EnableInClassList("dropdown-hide", true);
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canvas.Add(DropdownContainer);
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DropdownScrollView = Q<VisualElement>("DropdownScrollView");
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DropdownScrollView.EnableInClassList("dropdown-hide", false);
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DropdownContainer.Add(DropdownScrollView);
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scrollView = new UIScrollViewV(DropdownScrollView, DropdownContainer);
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DropdownItems = new ModuleUIItems<UIDropdownItem, T>(scrollView.Container, TemplateAsset,
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(data, element) => new UIDropdownItem(data, element, this));
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Input.RegisterCallback<ClickEvent>(evt => OpenDropdown());
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DropdownContainer.RegisterCallback<PointerDownEvent>(evt => CloseDropdown());
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}
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public virtual void Dispose() {
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canvas.Remove(DropdownContainer);
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DropdownItems.Release();
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Input.UnregisterCallback<ClickEvent>(evt => OpenDropdown());
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DropdownContainer.UnregisterCallback<PointerDownEvent>(evt => CloseDropdown());
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}
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public virtual void Update() {
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scrollView.Update();
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}
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/// <summary> 打开下拉框 </summary>
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public void OpenDropdown() {
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float width = Positioner.resolvedStyle.width;
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Vector2 position = Positioner.worldBound.position;
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DropdownScrollView.style.width = width;
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DropdownScrollView.style.left = position.x;
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DropdownScrollView.style.top = position.y;
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DropdownContainer.EnableInClassList("dropdown-hide", false);
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DropdownItems.Create(list);
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}
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/// <summary> 关闭下拉框 </summary>
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public void CloseDropdown() {
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DropdownContainer.EnableInClassList("dropdown-hide", true);
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}
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/// <summary> 更新值 </summary>
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public void UpdateValue(T value, bool send = true) {
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this.value = value;
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Tag.text = value.ToString();
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if (send) { ValueChanged?.Invoke(value); }
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}
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/// <summary> 设置值 </summary>
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public void SetValue(List<T> list) {
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this.list = list;
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if (list.Count > 0) { UpdateValue(list[0], false); }
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}
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#region UI项定义
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/// <summary>
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/// 设置标题 UI项
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/// </summary>
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internal class UIDropdownItem : ModuleUIItem<T> {
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public readonly UIDropdown<T> parent;
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public Button Button => Q<Button>();
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public VisualElement Check => Q<VisualElement>("Check");
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public UIDropdownItem(T value, VisualElement element, UIDropdown<T> parent) : base(value, element) {
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this.parent = parent;
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Button.text = value.ToString();
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Button.clicked += Select;
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Check.EnableInClassList("dropdown-hide", !value.Equals(parent.value));
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}
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public override void DefaultState() {
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Check.EnableInClassList("dropdown-hide", true);
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}
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public override void SelectState() {
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parent.UpdateValue(value);
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parent.CloseDropdown();
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Check.EnableInClassList("dropdown-hide", false);
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}
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}
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#endregion
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}
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} |