refactor: 重构代码提高可读性

Author: ArgoZhang

src/BootstrapBlazor/Components/Table/Table.razor

@@ -745,7 +745,7 @@
     </DynamicElement>;
 
     RenderFragment<TableContentCellContext<TItem>> RenderContentCell => context =>
-    @<td colspan="@GetColSpan(context.ColSpan)" class="@GetFixedCellClassString(context.Col, context.CellClass)" style="@GetFixedCellStyleString(context.Col)">
+    @<td colspan="@GetColSpan(context.Colspan)" class="@GetFixedCellClassString(context.Col, context.CellClass)" style="@GetFixedCellStyleString(context.Col)">
         <DynamicElement TagName="div" TriggerClick="@context.HasTreeChildren"
                         OnClick="@ToggleTreeRow(context.Item)" StopPropagation="context.HasTreeChildren"
                         class="@GetCellClassString(context.Col, context.HasTreeChildren, context.IsInCell)" style="@GetCellStyleString(context.Col)">

src/BootstrapBlazor/Components/Table/Table.razor.cs

@@ -1374,57 +1374,60 @@ private RenderFragment RenderContentRow(TItem item) => builder =>
         {
             if (colIndex > 1)
             {
+                // 合并单元格情况
                 colIndex--;
                 continue;
             }
-            var cellClass = "";
-            var colSpan = 0;
-            string? value = null;
-            RenderFragment? valueTemplate = null;
-            if (col.OnCellRender != null)
-            {
-                var cell = new TableCellArgs { Row = item, ColumnName = col.GetFieldName() };
-                col.OnCellRender(cell);
-                cellClass = cell.Class;
-                colSpan = cell.Colspan;
-                valueTemplate = cell.ValueTemplate;
-                value = cell.Value;
-                colIndex = colSpan;
-            }
 
-            var isFirstColOfTree = IsTree && index++ == 0;
-            var degree = 0;
-            var isExpand = false;
-            var hasChildren = false;
-            if (isFirstColOfTree)
-            {
-                var treeItem = TreeNodeCache.Find(TreeRows, item, out degree);
-                if (treeItem != null)
-                {
-                    isExpand = treeItem.IsExpand;
-                    hasChildren = treeItem.HasChildren;
-                }
-            }
-            var hasTreeChildren = isFirstColOfTree && hasChildren;
+            // 获得单元格参数
+            var cellArgs = GetCellArgs(item, col, ref colIndex);
+
+            // 获得树节点信息
+            var (isTreeCol, degree, isExpand, hasChildren) = GetTreeInfo(item, index++);
+            var hasTreeChildren = isTreeCol && hasChildren;
+
             var context = new TableContentCellContext<TItem>()
             {
                 Item = item,
-                ColSpan = colSpan,
                 Col = col,
-                CellClass = cellClass,
+                Colspan = cellArgs.Colspan,
+                CellClass = cellArgs.Class,
+                Value = cellArgs.Value,
+                ValueTemplate = cellArgs.ValueTemplate,
                 HasTreeChildren = hasTreeChildren,
                 IsInCell = isInCell,
                 Degree = degree,
                 IsExpand = isExpand,
-                IsFirstColOfTree = isFirstColOfTree,
-                ValueTemplate = valueTemplate,
-                Value = value
+                IsFirstColOfTree = isTreeCol
             };
 
             builder.AddContent(0, RenderContentCell(context));
         }
     };
 
+    private static TableCellArgs GetCellArgs(TItem item, ITableColumn col, ref int colIndex)
+    {
+        var cell = new TableCellArgs { Row = item, ColumnName = col.GetFieldName() };
+        col.OnCellRender?.Invoke(cell);
+        colIndex = cell.Colspan;
+        return cell;
+    }
+
+    private (bool isFirstColOfTree, int degree, bool isExpand, bool hasChildren) GetTreeInfo(TItem item, int index)
+    {
+        var isFirstColOfTree = IsTree && index == 0;
+        if (!isFirstColOfTree)
+        {
+            return (false, 0, false, false);
+        }
+
+        var treeItem = TreeNodeCache.Find(TreeRows, item, out var degree);
+        return (isFirstColOfTree,
+                 degree,
+                 treeItem?.IsExpand ?? false,
+                 treeItem?.HasChildren ?? false);
+    }
+
     /// <summary>
     /// 渲染单元格方法
     /// </summary>

src/BootstrapBlazor/Components/Table/TableContentCellContext.cs

@@ -9,7 +9,7 @@ readonly record struct TableContentCellContext<TItem>
 {
     public TItem Item { get; init; }
 
-    public int ColSpan { get; init; }
+    public int Colspan { get; init; }
 
     public ITableColumn Col { get; init; }