[dev-v5] Sync with v4

src/Core/Components/DataGrid/Columns/ColumnBase.razor.cs

@@ -187,6 +187,15 @@ public abstract partial class ColumnBase<TGridItem>
     [Parameter]
     public string? Width { get; set; }
 
+    /// <summary>
+    /// Gets or sets the minimal width of the column.
+    /// Defaults to 100px for a regular column and 50px for a select column.
+    /// When resizing a column, the user will not be able to make it smaller than this value.
+    /// Needs to be a valid CSS width value like '100px', '10%' or '0.5fr'.
+    /// </summary>
+    [Parameter]
+    public string MinWidth { get; set; } = "100px";
+
     /// <summary>
     /// Sets the column index for the current instance.
     /// </summary>

src/Core/Components/DataGrid/Columns/PropertyColumn.cs

@@ -65,18 +65,7 @@ protected override void OnParametersSet()
 
             if (!string.IsNullOrEmpty(Format))
             {
-                // TODO: Consider using reflection to avoid having to box every value just to call IFormattable.ToString
-                // For example, define a method "string Type<U>(Func<TGridItem, U> property) where U: IFormattable", and
-                // then construct the closed type here with U=TProp when we know TProp implements IFormattable
-
-                // If the type is nullable, we're interested in formatting the underlying type
-                var nullableUnderlyingTypeOrNull = Nullable.GetUnderlyingType(typeof(TProp));
-                if (!typeof(IFormattable).IsAssignableFrom(nullableUnderlyingTypeOrNull ?? typeof(TProp)))
-                {
-                    throw new InvalidOperationException($"A '{nameof(Format)}' parameter was supplied, but the type '{typeof(TProp)}' does not implement '{typeof(IFormattable)}'.");
-                }
-
-                _cellTextFunc = item => ((IFormattable?)compiledPropertyExpression!(item))?.ToString(Format, formatProvider: null);
+                _cellTextFunc = CreateFormatter(compiledPropertyExpression, Format);
             }
             else
             {
@@ -117,7 +106,57 @@ protected override void OnParametersSet()
             }
         }
     }
+
 #pragma warning restore IL2072 // Target parameter argument does not satisfy 'DynamicallyAccessedMembersAttribute' in call to target method. The return value of the source method does not have matching annotations.
+    private static Func<TGridItem, string?> CreateFormatter(Func<TGridItem, TProp> getter, string format)
+    {
+        var closedType = typeof(PropertyColumn<,>).MakeGenericType(typeof(TGridItem), typeof(TProp));
+
+        //Nullable struct
+        if (Nullable.GetUnderlyingType(typeof(TProp)) is Type underlying &&
+            typeof(IFormattable).IsAssignableFrom(underlying))
+        {
+            var method = closedType
+                .GetMethod(nameof(CreateNullableValueTypeFormatter), BindingFlags.NonPublic | BindingFlags.Static)!
+                .MakeGenericMethod(underlying);
+            return (Func<TGridItem, string?>)method.Invoke(null, [getter, format])!;
+        }
+
+        if (typeof(IFormattable).IsAssignableFrom(typeof(TProp)))
+        {
+            //Struct
+            if (typeof(TProp).IsValueType)
+            {
+                var method = closedType
+                    .GetMethod(nameof(CreateValueTypeFormatter), BindingFlags.NonPublic | BindingFlags.Static)!
+                    .MakeGenericMethod(typeof(TProp));
+                return (Func<TGridItem, string?>)method.Invoke(null, [getter, format])!;
+            }
+
+            //Double cast required because CreateReferenceTypeFormatter required the TProp to be a reference type which implements IFormattable.
+            return CreateReferenceTypeFormatter((Func<TGridItem, IFormattable?>)(object)getter, format);
+        }
+
+        throw new InvalidOperationException($"A '{nameof(Format)}' parameter was supplied, but the type '{typeof(TProp)}' does not implement '{typeof(IFormattable)}'.");
+    }
+
+    private static Func<TGridItem, string?> CreateReferenceTypeFormatter<T>(Func<TGridItem, T?> getter, string format)
+        where T : class, IFormattable
+    {
+        return item => getter(item)?.ToString(format, null);
+    }
+
+    private static Func<TGridItem, string?> CreateValueTypeFormatter<T>(Func<TGridItem, T> getter, string format)
+        where T : struct, IFormattable
+    {
+        return item => getter(item).ToString(format, null);
+    }
+
+    private static Func<TGridItem, string?> CreateNullableValueTypeFormatter<T>(Func<TGridItem, T?> getter, string format)
+        where T : struct, IFormattable
+    {
+        return item => getter(item)?.ToString(format, null);
+    }
 
     /// <inheritdoc />
     protected internal override void CellContent(RenderTreeBuilder builder, TGridItem item)

src/Core/Components/DataGrid/Columns/SelectColumn.cs

@@ -37,6 +37,7 @@ public class SelectColumn<TGridItem> : ColumnBase<TGridItem>, IDisposable
     public SelectColumn()
     {
         Width = "50px";
+        MinWidth = "50px";
         ChildContent = GetDefaultChildContent();
 
         _itemsChanged = new(EventCallback.Factory.Create<object?>(this, UpdateSelectedItemsAsync));

src/Core/Components/DataGrid/FluentDataGrid.razor.ts

@@ -2,7 +2,7 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
 
   interface Grid {
     id: string;
-    columns: any[]; // or a more specific type if you have one
+    columns: Column[]; // or a more specific type if you have one
     initialWidths: string;
   }
 
@@ -12,8 +12,7 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
   }
 
   // Use a dictionary for grids for id-based access
-  let grids: { [id: string]: Grid } = {};
-  const minWidth = 100;
+  let grids: Grid[] = []; // { [id: string]: Grid } = {};
 
   export function Initialize(gridElement: HTMLElement, autoFocus: boolean) {
     if (gridElement === undefined || gridElement === null) {
@@ -150,7 +149,8 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
         document.body.removeEventListener('click', bodyClickHandler);
         document.body.removeEventListener('mousedown', bodyClickHandler);
         gridElement.removeEventListener('keydown', keyDownHandler);
-        delete grids[gridElement.id];
+        grids = grids.filter(grid => grid.id !== gridElement.id);
+
       }
     };
   }
@@ -236,11 +236,13 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
     }
 
     const id = gridElement.id;
-    grids[id] = {
-      id,
-      columns,
-      initialWidths,
-    };
+    if (!grids.find((grid: Grid) => grid.id === id)) {
+        grids.push({
+            id,
+            columns,
+            initialWidths,
+        });
+    }
 
     function setListeners(div: HTMLElement, isRTL: boolean) {
       let pageX: number | undefined, curCol: HTMLElement | undefined, curColWidth: number | undefined;
@@ -273,7 +275,7 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
             const diffX = isRTL ? (pageX! - e.pageX) : (e.pageX - pageX!);
             const column: Column = columns.find(({ header }) => header === curCol)!;
 
-            column.size = parseInt(Math.max(minWidth, curColWidth! + diffX) as any, 10) + 'px';
+            column.size = parseInt(Math.max(parseInt((column.header as HTMLElement).style.minWidth), curColWidth! + diffX) as any, 10) + 'px';
 
             columns.forEach((col) => {
               if (col.size.startsWith('minmax')) {
@@ -345,7 +347,7 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
 
   export function ResetColumnWidths(gridElement: HTMLElement) {
     const isGrid = gridElement.classList.contains('grid');
-    const grid = grids[gridElement.id];
+    const grid = grids.find(grid => grid.id = gridElement.id);
     if (!grid) {
       return;
     }
@@ -370,6 +372,7 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
   }
 
   export function ResizeColumnDiscrete(gridElement: HTMLElement, column: string | undefined, change: number) {
+    const isGrid = gridElement.classList.contains('grid');
     const columns: any[] = [];
     let headerBeingResized: HTMLElement | null | undefined;
 
@@ -383,50 +386,62 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
     else {
       headerBeingResized = gridElement.querySelector('.column-header[col-index="' + column + '"]') as HTMLElement | null;
     }
-
-    grids[gridElement.id].columns.forEach((column: any) => {
+    grids.find(grid => grid.id = gridElement.id)!.columns.forEach((column: any) => {
       if (column.header === headerBeingResized) {
-        const width = headerBeingResized!.getBoundingClientRect().width + change;
+        const width = headerBeingResized!.offsetWidth + change;
+        //const width = headerBeingResized!.getBoundingClientRect().width + change;
 
         if (change < 0) {
-          column.size = Math.max(minWidth, width) + 'px';
+          column.size = Math.max(parseInt(column.header.style.minWidth), width) + 'px';
         }
         else {
           column.size = width + 'px';
         }
+        column.header.style.width = column.size;
       }
-      else {
+
+      if (isGrid) {
+        // for grid we need to recalculate all columns that are minmax
         if (column.size.startsWith('minmax')) {
           column.size = parseInt(column.header.clientWidth, 10) + 'px';
         }
+        columns.push(column.size);
       }
-      columns.push(column.size);
     });
 
-    gridElement.style.gridTemplateColumns = columns.join(' ');
+    if (isGrid) {
+      gridElement.style.gridTemplateColumns = columns.join(' ');
+    }
   }
 
   export function ResizeColumnExact(gridElement: HTMLElement, column: string, width: number) {
+    const isGrid = gridElement.classList.contains('grid');
     const columns: any[] = [];
     let headerBeingResized = gridElement.querySelector('.column-header[col-index="' + column + '"]') as HTMLElement | null;
 
     if (!headerBeingResized) {
       return;
     }
 
-    grids[gridElement.id].columns.forEach((column: any) => {
+    grids.find(grid => grid.id = gridElement.id)!.columns.forEach((column: any) => {
       if (column.header === headerBeingResized) {
-        column.size = Math.max(minWidth, width) + 'px';
+        column.size = Math.max(parseInt(column.header.style.minWidth), width) + 'px';
+        column.header.style.width = column.size;
       }
-      else {
+
+      if (isGrid) {
+        // for grid we need to recalculate all columns that are minmax
         if (column.size.startsWith('minmax')) {
           column.size = parseInt(column.header.clientWidth, 10) + 'px';
         }
+        column.header.style.width = column.size;
+        columns.push(column.size);
       }
-      columns.push(column.size);
     });
 
-    gridElement.style.gridTemplateColumns = columns.join(' ');
+    if (isGrid) {
+      gridElement.style.gridTemplateColumns = columns.join(' ');
+    }
 
     gridElement.dispatchEvent(new CustomEvent('closecolumnresize', { bubbles: true }));
     gridElement.focus();
@@ -448,8 +463,9 @@ export namespace Microsoft.FluentUI.Blazor.DataGrid {
     gridElement.style.gridTemplateColumns = gridTemplateColumns;
     gridElement.classList.remove('auto-fit');
 
-    if (grids[gridElement.id]) {
-      grids[gridElement.id].initialWidths = gridTemplateColumns;
+    const grid = grids.find(grid => grid.id = gridElement.id);
+    if (grid) {
+      grid.initialWidths = gridTemplateColumns;
     }
   }
 

src/Core/Components/DataGrid/FluentDataGridCell.razor.cs

@@ -17,7 +17,7 @@ public partial class FluentDataGridCell<TGridItem> : FluentComponentBase
     /// <summary>
     /// Gets a reference to the column that this cell belongs to.
     /// </summary>
-    private ColumnBase<TGridItem>? Column => Grid._columns.ElementAtOrDefault(GridColumn - 1);
+    public ColumnBase<TGridItem>? Column => Grid._columns.ElementAtOrDefault(GridColumn - 1);
 
     internal string CellId { get; set; } = string.Empty;
 
@@ -39,6 +39,7 @@ public FluentDataGridCell(LibraryConfiguration configuration) : base(configurati
         .AddStyle("grid-column", GridColumn.ToString(CultureInfo.InvariantCulture), () => !Grid.EffectiveLoadingValue && (Grid.Items is not null || Grid.ItemsProvider is not null) && Grid.DisplayMode == DataGridDisplayMode.Grid)
         .AddStyle("text-align", "center", Column is SelectColumn<TGridItem>)
         .AddStyle("align-content", "center", Column is SelectColumn<TGridItem>)
+        .AddStyle("min-width", Column?.MinWidth, Owner.RowType is DataGridRowType.Header or DataGridRowType.StickyHeader)
         .AddStyle("padding-top", "10px", Column is SelectColumn<TGridItem> && (Grid.RowSize == DataGridRowSize.Medium || Owner.RowType == DataGridRowType.Header))
         .AddStyle("padding-top", "6px", Column is SelectColumn<TGridItem> && Grid.RowSize == DataGridRowSize.Small && Owner.RowType == DataGridRowType.Default)
         .AddStyle("width", Column?.Width, !string.IsNullOrEmpty(Column?.Width) && Grid.DisplayMode == DataGridDisplayMode.Table)

src/Core/Components/DataGrid/FluentDataGridRow.razor.cs

@@ -86,6 +86,11 @@ public FluentDataGridRow(LibraryConfiguration configuration) : base(configuratio
     /// </summary>
     protected FluentDataGrid<TGridItem> Grid => InternalGridContext.Grid;
 
+    /// <summary>
+    /// Gets the columns associated with this data grid row.
+    /// </summary>
+    public IReadOnlyList<ColumnBase<TGridItem>> Columns => Grid._columns;
+
     /// <summary>
     /// Sets the RowIndex for this row.
     /// </summary>

tests/Core/Components/DataGrid/FluentDataGridCellTests.razor

@@ -42,6 +42,21 @@
         Assert.Null(cell.Instance.ChildContent);
     }
 
+	[Fact]
+    public void FluentDataGridCell_Properties_CompileCorrectly()
+    {
+        // This test verifies that our new public properties compile correctly
+        // by checking that they exist and are public using reflection
+
+        var cellType = typeof(FluentDataGridCell<object>);
+
+        // Verify that the Column property exists on DataGridCell
+        var columnProperty = cellType.GetProperty("Column");
+        Assert.NotNull(columnProperty);
+        Assert.True(columnProperty.CanRead);
+        Assert.True(columnProperty.GetMethod?.IsPublic);
+    }
+
     [Fact]
     public async Task FluentDataGridCell_HandleOnCellClickAsync_InvokesCallbacks()
     {