From d1f1227a4f953ea11e9e4469070a8d2c59fea07f Mon Sep 17 00:00:00 2001
From: Andrzej Bakun <andrzej@neelyc.com.cy>
Date: Fri, 5 Mar 2021 16:58:38 +0100
Subject: [PATCH] feat(module: table): add OnExpand event (#1208)

---
 components/table/Column.razor.cs |  5 ++++-
 components/table/ITable.cs       |  2 ++
 components/table/Table.razor.cs  | 12 ++++++++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/components/table/Column.razor.cs b/components/table/Column.razor.cs
index b72d9a36..4cc7a659 100644
--- a/components/table/Column.razor.cs
+++ b/components/table/Column.razor.cs
@@ -191,8 +191,11 @@ namespace AntDesign
 
         private void ToggleTreeNode()
         {
+            bool expandValueBeforeChange = RowData.Expanded;
             RowData.Expanded = !RowData.Expanded;
-            Table?.Refresh();
+            Table?.OnExpandChange(RowData.CacheKey);
+            if (RowData.Expanded != expandValueBeforeChange)
+                Table?.Refresh();
         }
 
         private void FilterSelected(TableFilter<TData> filter)
diff --git a/components/table/ITable.cs b/components/table/ITable.cs
index 2e8ac321..154c6e0a 100644
--- a/components/table/ITable.cs
+++ b/components/table/ITable.cs
@@ -28,6 +28,8 @@ namespace AntDesign
 
         internal void SelectionChanged();
 
+        internal void OnExpandChange(int cacheKey);
+
         internal void Refresh();
 
         internal void ReloadAndInvokeChange();
diff --git a/components/table/Table.razor.cs b/components/table/Table.razor.cs
index f23d1bb2..8e384572 100644
--- a/components/table/Table.razor.cs
+++ b/components/table/Table.razor.cs
@@ -103,6 +103,9 @@ namespace AntDesign
         [Parameter]
         public Func<RowData<TItem>, string> ExpandedRowClassName { get; set; } = _ => "";
 
+        [Parameter]
+        public EventCallback<RowData<TItem>> OnExpand { get; set; }
+
         [Parameter]
         public SortDirection[] SortDirections { get; set; } = SortDirection.Preset.Default;
 
@@ -145,8 +148,17 @@ namespace AntDesign
         int ITable.ExpandIconColumnIndex => ExpandIconColumnIndex;
         int ITable.TreeExpandIconColumnIndex => _treeExpandIconColumnIndex;
         bool ITable.HasExpandTemplate => ExpandTemplate != null;
+
         SortDirection[] ITable.SortDirections => SortDirections;
 
+        void ITable.OnExpandChange(int cacheKey)
+        {
+            if (OnExpand.HasDelegate && _dataSourceCache.TryGetValue(cacheKey, out var currentRowData))
+            {
+                OnExpand.InvokeAsync(currentRowData);
+            }
+        }
+
         public void ReloadData()
         {
             PageIndex = 1;