168 lines
4.7 KiB
C#
168 lines
4.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using MECF.Framework.UI.Client.CenterViews.Configs.Roles;
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using MECF.Framework.UI.Client.ClientBase;
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namespace MECF.Framework.UI.Client.RecipeEditorLib.RecipeModel.Params
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{
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public abstract class ParamBaseWithGenericValue<TValue> : Param, IValueParam
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{
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#region Variables
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public event EventHandler<object> OnValueChanged;
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protected TValue _value;
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protected TValue _valueSnapshot;
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protected IParam _previous;
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#endregion
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#region Constructors
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protected ParamBaseWithGenericValue()
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{
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}
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protected ParamBaseWithGenericValue(TValue initValue) : this()
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{
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if (initValue.GetType() != typeof(TValue))
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initValue = default;
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_value = initValue;
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_valueSnapshot = initValue;
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}
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#endregion
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#region Properties
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public virtual TValue Value
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{
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get => _value;
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set
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{
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_value = value;
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NotifyOfPropertyChange();
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ColumnPermChangedCallback?.Invoke(this);
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_isSaved = _value.Equals(_valueSnapshot);
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NotifyOfPropertyChange(nameof(IsSaved));
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// 当Value发生变化时，要办一下事项，以及时刷新UI状态。
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CheckValueEqualityWithPrevious();
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Validate();
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}
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}
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public override IParam Previous
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{
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get => _previous;
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set
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{
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//! 如果前序参数的Value发生了变化，则需要通知我进行比较，以确定我的Value是否和前序参数的Value相等。
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// 注销之前注册的事件。
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if (_previous is Param preParam)
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preParam.PropertyChanged -= OnPreviousParamValueChanged;
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_previous = value;
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// 注册事件.
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if (_previous is Param p)
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{
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p.PropertyChanged += OnPreviousParamValueChanged;
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// 立即执行一次比较
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CheckValueEqualityWithPrevious();
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}
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}
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}
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public override IParam Next { get; set; }
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#endregion
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#region Methods
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/// <summary>
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/// 判断Value属性是否相等。
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/// </summary>
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/// <param name="v1"></param>
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/// <param name="v2"></param>
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/// <returns></returns>
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protected static bool IsTValueEqual(TValue v1, TValue v2)
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{
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return Comparer<TValue>.Default.Compare(v1, v2) == 0;
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}
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/// <summary>
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/// 检查我的Value是否和前序参数的Value相等。
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/// </summary>
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private void CheckValueEqualityWithPrevious()
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{
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if (_previous is ParamBaseWithGenericValue<TValue> valuedParam)
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{
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IsEqualsToPrevious = IsTValueEqual(_value, valuedParam.Value);
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}
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}
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/// <summary>
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/// 当前序参数的Value发生变化时，判断其是否和我的Value属性相等。
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void OnPreviousParamValueChanged(object sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == nameof(Value) && _previous is ParamBaseWithGenericValue<TValue> valuedParam)
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{
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IsEqualsToPrevious = IsTValueEqual(_value, valuedParam.Value);
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}
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}
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/// <summary>
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/// 保存数据。
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/// </summary>
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public override void Save()
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{
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_valueSnapshot = _value;
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base.Save();
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}
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/// <inheritdoc />
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public virtual object GetValue()
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{
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if (Permission == MenuPermissionEnum.MP_NONE)
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throw new PermissionException(Permission);
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return Value;
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}
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public void SetValue(object value)
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{
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if (Permission != MenuPermissionEnum.MP_READ_WRITE)
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throw new PermissionException(Permission);
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HandleSetValue(value);
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OnValueChanged?.Invoke(this, value);
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}
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protected virtual void HandleSetValue(object value)
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{
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Debug.Assert(value.GetType() == typeof(TValue), "The type of value does not match to my type.");
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Value = (TValue)value;
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}
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public override string ToString()
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{
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return $"{base.ToString()}, Value={_value}";
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}
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#endregion
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}
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}
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