feat(Select): redesign OnBeforeSelectedItemChange logic (#6199)

* refactor: 重构 ShowSwal 逻辑

* refactor: 更改 ShowSwal 默认值

Author: ArgoZhang

src/BootstrapBlazor/Components/Select/Select.razor.cs

@@ -52,17 +52,18 @@ public partial class Select<TValue> : ISelect, ILookup
     public bool DisableItemChangedWhenFirstRender { get; set; }
 
     /// <summary>
-    /// Gets or sets the callback method before the selected item changes. Returns true to change the selected item value; otherwise, the selected item value does not change.
+    /// 获取/设置 选中项改变前的回调方法。返回 true 则改变选中项的值；否则选中项的值不变。
+    /// <para>Gets or sets the callback method before the selected item changes. Returns true to change the selected item value; otherwise, the selected item value does not change.</para>
     /// </summary>
     [Parameter]
     public Func<SelectedItem, Task<bool>>? OnBeforeSelectedItemChange { get; set; }
 
     /// <summary>
-    /// Gets or sets whether to show the Swal confirmation popup when <see cref="OnBeforeSelectedItemChange"/> returns true. Default is true.
-    /// 获得/设置 是否显示 Swal 确认弹窗
+    /// Gets or sets whether to show the Swal confirmation popup. Default is false.
+    /// 获得/设置 是否显示 Swal 确认弹窗 默认值 为 false
     /// </summary>
     [Parameter]
-    public bool ShowSwal { get; set; } = true;
+    public bool ShowSwal { get; set; }
 
     /// <summary>
     /// Gets or sets the callback method when the selected item changes.
@@ -342,26 +343,31 @@ public async Task ConfirmSelectedItem(int index)
     private async Task OnClickItem(SelectedItem item)
     {
         var ret = true;
+
+        // 自定义回调方法 OnBeforeSelectedItemChange 返回 false 时不修改选中项
         if (OnBeforeSelectedItemChange != null)
         {
             ret = await OnBeforeSelectedItemChange(item);
-            if (ret && ShowSwal)
+        }
+
+        // 如果 ShowSwal 为 true 且 则显示 Swal 确认弹窗，通过确认弹窗返回值决定是否修改选中项
+        if (ret && ShowSwal)
+        {
+            var option = new SwalOption()
+            {
+                Category = SwalCategory,
+                Title = SwalTitle,
+                Content = SwalContent
+            };
+            if (!string.IsNullOrEmpty(SwalFooter))
             {
-                // Return true to show modal
-                var option = new SwalOption()
-                {
-                    Category = SwalCategory,
-                    Title = SwalTitle,
-                    Content = SwalContent
-                };
-                if (!string.IsNullOrEmpty(SwalFooter))
-                {
-                    option.ShowFooter = true;
-                    option.FooterTemplate = builder => builder.AddContent(0, SwalFooter);
-                }
-                ret = await SwalService.ShowModal(option);
+                option.ShowFooter = true;
+                option.FooterTemplate = builder => builder.AddContent(0, SwalFooter);
             }
+            ret = await SwalService.ShowModal(option);
         }
+
+        // 如果 ret 为 true 则修改选中项
         if (ret)
         {
             _defaultVirtualizedItemText = item.Text;