refactor: 增加 MultiSelectFilter 组件

Author: ArgoZhang

src/BootstrapBlazor/Components/Filters/MultiSelectFilter.razor

@@ -0,0 +1,16 @@
+@namespace BootstrapBlazor.Components
+@inherits FilterBase
+@typeparam TType
+
+@if (IsHeaderRow)
+{
+    <div class="@FilterRowClassString">
+        <MultiSelect class="is-filter" @bind-Value="_value1" OnValueChanged="_ => OnFilterAsync()"
+                     ShowLabel="false" SkipValidate="true" IsPopover="true"></MultiSelect>
+        <FilterButton Items="Items" @bind-Value="_action1" OnSelectedItemChanged="_ => OnFilterAsync()" OnClearFilter="OnClearFilter"></FilterButton>
+    </div>
+}
+else
+{
+    <MultiSelect Items="@Items" @bind-Value="@_value1" IsPopover="true" ShowLabel="false" SkipValidate="true"></MultiSelect>
+}

src/BootstrapBlazor/Components/Filters/MultiSelectFilter.razor.cs

@@ -0,0 +1,91 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License
+// See the LICENSE file in the project root for more information.
+// Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
+
+namespace BootstrapBlazor.Components;
+
+/// <summary>
+/// 多项选择下拉框过滤组件
+/// </summary>
+public partial class MultiSelectFilter<TType>
+{
+    private string? FilterRowClassString => CssBuilder.Default("filter-row")
+        .AddClass("active", TableColumnFilter.HasFilter())
+        .Build();
+
+    private TType? _value1;
+    private FilterAction _action1 = FilterAction.Equal;
+
+    /// <summary>
+    /// Gets or sets the filter items.
+    /// </summary>
+    [Parameter]
+    public List<SelectedItem>? Items { get; set; }
+
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    public override void Reset()
+    {
+        _value1 = default;
+        _action1 = FilterAction.GreaterThanOrEqual;
+        Count = 0;
+        Logic = FilterLogic.And;
+        StateHasChanged();
+    }
+
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    /// <returns></returns>
+    public override FilterKeyValueAction GetFilterConditions()
+    {
+        var filter = new FilterKeyValueAction() { FilterLogic = FilterLogic.Or };
+        if (_value1 is string v)
+        {
+            var items = v.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+            foreach (var item in items)
+            {
+                filter.Filters.Add(new FilterKeyValueAction
+                {
+                    FieldKey = FieldKey,
+                    FieldValue = item,
+                    FilterAction = _action1
+                });
+            }
+        }
+        else if (_value1 is IEnumerable<string> values)
+        {
+            foreach (var item in values)
+            {
+                filter.Filters.Add(new FilterKeyValueAction
+                {
+                    FieldKey = FieldKey,
+                    FieldValue = item,
+                    FilterAction = _action1
+                });
+            }
+        }
+        return filter;
+    }
+
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    public override async Task SetFilterConditionsAsync(FilterKeyValueAction filter)
+    {
+        var first = filter.Filters.FirstOrDefault() ?? filter;
+        if (first.FieldValue is TType value)
+        {
+            _value1 = value;
+        }
+        else
+        {
+            _value1 = default;
+        }
+        _action1 = first.FilterAction;
+
+        await base.SetFilterConditionsAsync(filter);
+    }
+}