diff --git a/samples/ControlCatalog/Pages/DataGridPage.xaml b/samples/ControlCatalog/Pages/DataGridPage.xaml index f7e3cf2441..31b4039d33 100644 --- a/samples/ControlCatalog/Pages/DataGridPage.xaml +++ b/samples/ControlCatalog/Pages/DataGridPage.xaml @@ -13,9 +13,22 @@ + + + + @@ -31,7 +44,9 @@ - + diff --git a/src/Avalonia.Base/LogicalTree/ChildIndexChangedEventArgs.cs b/src/Avalonia.Base/LogicalTree/ChildIndexChangedEventArgs.cs index de41f5292c..497596fcc1 100644 --- a/src/Avalonia.Base/LogicalTree/ChildIndexChangedEventArgs.cs +++ b/src/Avalonia.Base/LogicalTree/ChildIndexChangedEventArgs.cs @@ -8,7 +8,9 @@ namespace Avalonia.LogicalTree /// public class ChildIndexChangedEventArgs : EventArgs { - public ChildIndexChangedEventArgs() + public static new ChildIndexChangedEventArgs Empty { get; } = new ChildIndexChangedEventArgs(); + + private ChildIndexChangedEventArgs() { } diff --git a/src/Avalonia.Controls.DataGrid/DataGrid.cs b/src/Avalonia.Controls.DataGrid/DataGrid.cs index 9dfb34517b..9b67c9b096 100644 --- a/src/Avalonia.Controls.DataGrid/DataGrid.cs +++ b/src/Avalonia.Controls.DataGrid/DataGrid.cs @@ -669,8 +669,6 @@ namespace Avalonia.Controls ItemsProperty.Changed.AddClassHandler((x, e) => x.OnItemsPropertyChanged(e)); CanUserResizeColumnsProperty.Changed.AddClassHandler((x, e) => x.OnCanUserResizeColumnsChanged(e)); ColumnWidthProperty.Changed.AddClassHandler((x, e) => x.OnColumnWidthChanged(e)); - RowBackgroundProperty.Changed.AddClassHandler((x, e) => x.OnRowBackgroundChanged(e)); - AlternatingRowBackgroundProperty.Changed.AddClassHandler((x, e) => x.OnRowBackgroundChanged(e)); FrozenColumnCountProperty.Changed.AddClassHandler((x, e) => x.OnFrozenColumnCountChanged(e)); GridLinesVisibilityProperty.Changed.AddClassHandler((x, e) => x.OnGridLinesVisibilityChanged(e)); HeadersVisibilityProperty.Changed.AddClassHandler((x, e) => x.OnHeadersVisibilityChanged(e)); @@ -1144,14 +1142,6 @@ namespace Avalonia.Controls InvalidateCellsArrange(); } - private void OnRowBackgroundChanged(AvaloniaPropertyChangedEventArgs e) - { - foreach (DataGridRow row in GetAllRows()) - { - row.EnsureBackground(); - } - } - private void OnColumnWidthChanged(AvaloniaPropertyChangedEventArgs e) { var value = (DataGridLength)e.NewValue; diff --git a/src/Avalonia.Controls.DataGrid/DataGridColumn.cs b/src/Avalonia.Controls.DataGrid/DataGridColumn.cs index a77b482436..4a7137dcda 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridColumn.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridColumn.cs @@ -199,7 +199,7 @@ namespace Avalonia.Controls if (change.Property == IsVisibleProperty) { OwningGrid?.OnColumnVisibleStateChanging(this); - var isVisible = (change as AvaloniaPropertyChangedEventArgs).NewValue.Value; + var isVisible = change.NewValue.GetValueOrDefault(); if (_headerCell != null) { diff --git a/src/Avalonia.Controls.DataGrid/DataGridColumnCollection.cs b/src/Avalonia.Controls.DataGrid/DataGridColumnCollection.cs index 922b1d9c08..e7f9a9a6c4 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridColumnCollection.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridColumnCollection.cs @@ -12,7 +12,8 @@ namespace Avalonia.Controls { internal class DataGridColumnCollection : ObservableCollection { - private DataGrid _owningGrid; + private readonly Dictionary _columnsMap = new Dictionary(); + private readonly DataGrid _owningGrid; public DataGridColumnCollection(DataGrid owningGrid) { @@ -124,18 +125,8 @@ namespace Avalonia.Controls internal int VisibleColumnCount { - get - { - int visibleColumnCount = 0; - for (int columnIndex = 0; columnIndex < ItemsInternal.Count; columnIndex++) - { - if (ItemsInternal[columnIndex].IsVisible) - { - visibleColumnCount++; - } - } - return visibleColumnCount; - } + get; + private set; } internal double VisibleEdgedColumnsWidth @@ -287,20 +278,31 @@ namespace Avalonia.Controls { VisibleStarColumnCount = 0; VisibleEdgedColumnsWidth = 0; + VisibleColumnCount = 0; + _columnsMap.Clear(); + for (int columnIndex = 0; columnIndex < ItemsInternal.Count; columnIndex++) { - if (ItemsInternal[columnIndex].IsVisible) + var item = ItemsInternal[columnIndex]; + _columnsMap[columnIndex] = item.DisplayIndex; + if (item.IsVisible) { - ItemsInternal[columnIndex].EnsureWidth(); - if (ItemsInternal[columnIndex].Width.IsStar) + VisibleColumnCount++; + item.EnsureWidth(); + if (item.Width.IsStar) { VisibleStarColumnCount++; } - VisibleEdgedColumnsWidth += ItemsInternal[columnIndex].ActualWidth; + VisibleEdgedColumnsWidth += item.ActualWidth; } } } + internal int GetColumnDisplayIndex(int columnIndex) + { + return _columnsMap.TryGetValue(columnIndex, out var displayIndex) ? displayIndex : -1; + } + internal DataGridColumn GetColumnAtDisplayIndex(int displayIndex) { if (displayIndex < 0 || displayIndex >= ItemsInternal.Count || displayIndex >= DisplayIndexMap.Count) diff --git a/src/Avalonia.Controls.DataGrid/DataGridColumns.cs b/src/Avalonia.Controls.DataGrid/DataGridColumns.cs index a4577ee952..52f0ad7537 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridColumns.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridColumns.cs @@ -444,12 +444,11 @@ namespace Avalonia.Controls // We need to explicitly collapse the cells of the invisible column because layout only goes through // visible ones - if (!updatedColumn.IsVisible) + ColumnHeaders?.InvalidateChildIndex(); + foreach (var row in GetAllRows()) { - foreach (DataGridRow row in GetAllRows()) - { - row.Cells[updatedColumn.Index].IsVisible = false; - } + row.Cells[updatedColumn.Index].IsVisible = updatedColumn.IsVisible; + row.InvalidateCellsIndex(); } } diff --git a/src/Avalonia.Controls.DataGrid/DataGridDataConnection.cs b/src/Avalonia.Controls.DataGrid/DataGridDataConnection.cs index fade597ca1..a3095ad214 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridDataConnection.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridDataConnection.cs @@ -77,7 +77,7 @@ namespace Avalonia.Controls private set; } - public int Count => GetCount(true); + public int Count => TryGetCount(true, false, out var count) ? count : 0; public bool DataIsPrimitive { @@ -193,22 +193,25 @@ namespace Avalonia.Controls } } - internal bool Any() - { - return GetCount(false) > 0; - } - /// When "allowSlow" is false, method will not use Linq.Count() method and will return 0 or 1 instead. - private int GetCount(bool allowSlow) + /// If "getAny" is true, method can use Linq.Any() method to speedup. + internal bool TryGetCount(bool allowSlow, bool getAny, out int count) { - return DataSource switch + bool result; + (result, count) = DataSource switch { - ICollection collection => collection.Count, - DataGridCollectionView cv => cv.Count, - IEnumerable enumerable when allowSlow => enumerable.Cast().Count(), - IEnumerable enumerable when !allowSlow => enumerable.Cast().Any() ? 1 : 0, - _ => 0 + ICollection collection => (true, collection.Count), + DataGridCollectionView cv => (true, cv.Count), + IEnumerable enumerable when allowSlow && !getAny => (true, enumerable.Cast().Count()), + IEnumerable enumerable when getAny => (true, enumerable.Cast().Any() ? 1 : 0), + _ => (false, 0) }; + return result; + } + + internal bool Any() + { + return TryGetCount(false, true, out var count) && count > 0; } /// @@ -383,7 +386,7 @@ namespace Avalonia.Controls List propertyNames = TypeHelper.SplitPropertyPath(propertyName); for (int i = 0; i < propertyNames.Count; i++) { - propertyInfo = propertyType.GetPropertyOrIndexer(propertyNames[i], out object[] index); + propertyInfo = propertyType.GetPropertyOrIndexer(propertyNames[i], out _); if (propertyInfo == null || propertyType.GetIsReadOnly() || propertyInfo.GetIsReadOnly()) { // Either the data type is read-only, the property doesn't exist, or it does exist but is read-only @@ -391,11 +394,10 @@ namespace Avalonia.Controls } // Check if EditableAttribute is defined on the property and if it indicates uneditable - object[] attributes = propertyInfo.GetCustomAttributes(typeof(EditableAttribute), true); + var attributes = propertyInfo.GetCustomAttributes(typeof(EditableAttribute), true); if (attributes != null && attributes.Length > 0) { - EditableAttribute editableAttribute = attributes[0] as EditableAttribute; - Debug.Assert(editableAttribute != null); + var editableAttribute = (EditableAttribute)attributes[0]; if (!editableAttribute.AllowEdit) { return true; diff --git a/src/Avalonia.Controls.DataGrid/DataGridRow.cs b/src/Avalonia.Controls.DataGrid/DataGridRow.cs index 1efce7c0b8..a6faec752d 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridRow.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridRow.cs @@ -543,7 +543,6 @@ namespace Avalonia.Controls RootElement = e.NameScope.Find(DATAGRIDROW_elementRoot); if (RootElement != null) { - EnsureBackground(); UpdatePseudoClasses(); } @@ -668,43 +667,9 @@ namespace Avalonia.Controls Slot = -1; } - // Make sure the row's background is set to its correct value. It could be explicity set or inherit - // DataGrid.RowBackground or DataGrid.AlternatingRowBackground - internal void EnsureBackground() + internal void InvalidateCellsIndex() { - // Inherit the DataGrid's RowBackground properties only if this row doesn't explicity have a background set - if (RootElement != null && OwningGrid != null) - { - IBrush newBackground = null; - if (Background == null) - { - if (Index % 2 == 0 || OwningGrid.AlternatingRowBackground == null) - { - // Use OwningGrid.RowBackground if the index is even or if the OwningGrid.AlternatingRowBackground is null - if (OwningGrid.RowBackground != null) - { - newBackground = OwningGrid.RowBackground; - } - } - else - { - // Alternate row - if (OwningGrid.AlternatingRowBackground != null) - { - newBackground = OwningGrid.AlternatingRowBackground; - } - } - } - else - { - newBackground = Background; - } - - if (RootElement.Background != newBackground) - { - RootElement.Background = newBackground; - } - } + _cellsElement?.InvalidateChildIndex(); } internal void EnsureFillerVisibility() diff --git a/src/Avalonia.Controls.DataGrid/DataGridRows.cs b/src/Avalonia.Controls.DataGrid/DataGridRows.cs index 1d5c899993..f3afe2c42d 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridRows.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridRows.cs @@ -5,6 +5,7 @@ using Avalonia.Collections; using Avalonia.Controls.Utils; +using Avalonia.LogicalTree; using Avalonia.Media; using Avalonia.Utilities; using System; @@ -811,7 +812,7 @@ namespace Avalonia.Controls if (row.Slot > slotDeleted) { CorrectRowAfterDeletion(row, wasRow); - row.EnsureBackground(); + _rowsPresenter?.InvalidateChildIndex(row); } } @@ -867,7 +868,7 @@ namespace Avalonia.Controls if (row.Slot >= slotInserted) { DataGrid.CorrectRowAfterInsertion(row, rowInserted); - row.EnsureBackground(); + _rowsPresenter?.InvalidateChildIndex(row); } } @@ -1485,8 +1486,8 @@ namespace Avalonia.Controls // If the row has been recycled, reapply the BackgroundBrush if (row.IsRecycled) { - row.EnsureBackground(); row.ApplyCellsState(); + _rowsPresenter?.InvalidateChildIndex(row); } else if (row == EditingRow) { diff --git a/src/Avalonia.Controls.DataGrid/DataGridTextColumn.cs b/src/Avalonia.Controls.DataGrid/DataGridTextColumn.cs index 863910c226..68736dee7f 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridTextColumn.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridTextColumn.cs @@ -19,8 +19,6 @@ namespace Avalonia.Controls /// public class DataGridTextColumn : DataGridBoundColumn { - private const string DATAGRID_TextColumnCellTextBlockMarginKey = "DataGridTextColumnCellTextBlockMargin"; - /// /// Initializes a new instance of the class. /// @@ -178,8 +176,7 @@ namespace Avalonia.Controls { TextBlock textBlockElement = new TextBlock { - [!Layoutable.MarginProperty] = new DynamicResourceExtension(DATAGRID_TextColumnCellTextBlockMarginKey), - VerticalAlignment = VerticalAlignment.Center + Name = "CellTextBlock" }; SyncProperties(textBlockElement); diff --git a/src/Avalonia.Controls.DataGrid/Primitives/DataGridCellsPresenter.cs b/src/Avalonia.Controls.DataGrid/Primitives/DataGridCellsPresenter.cs index c5fe9f0cb2..e07c933039 100644 --- a/src/Avalonia.Controls.DataGrid/Primitives/DataGridCellsPresenter.cs +++ b/src/Avalonia.Controls.DataGrid/Primitives/DataGridCellsPresenter.cs @@ -3,12 +3,13 @@ // Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details. // All other rights reserved. +using Avalonia.LogicalTree; using Avalonia.Media; using Avalonia.Utilities; using System; +using System.Collections.Generic; +using System.Collections.Specialized; using System.Diagnostics; -using Avalonia.Controls; -using Avalonia.Controls.Utils; namespace Avalonia.Controls.Primitives { @@ -16,9 +17,10 @@ namespace Avalonia.Controls.Primitives /// Used within the template of a /// to specify the location in the control's visual tree where the cells are to be added. /// - public sealed class DataGridCellsPresenter : Panel + public sealed class DataGridCellsPresenter : Panel, IChildIndexProvider { private double _fillerLeftEdge; + private EventHandler _childIndexChanged; // The desired height needs to be cached due to column virtualization; otherwise, the cells // would grow and shrink as the DataGrid scrolls horizontally @@ -42,6 +44,25 @@ namespace Avalonia.Controls.Primitives set; } + event EventHandler IChildIndexProvider.ChildIndexChanged + { + add => _childIndexChanged += value; + remove => _childIndexChanged -= value; + } + + int IChildIndexProvider.GetChildIndex(ILogical child) + { + return child is DataGridCell cell + ? OwningGrid.ColumnsInternal.GetColumnDisplayIndex(cell.ColumnIndex) + : throw new InvalidOperationException("Invalid cell type"); + } + + bool IChildIndexProvider.TryGetTotalCount(out int count) + { + count = OwningGrid.ColumnsInternal.VisibleColumnCount; + return true; + } + /// /// Arranges the content of the . /// @@ -120,6 +141,13 @@ namespace Avalonia.Controls.Primitives } } + protected override void ChildrenChanged(object sender, NotifyCollectionChangedEventArgs e) + { + base.ChildrenChanged(sender, e); + + InvalidateChildIndex(); + } + private static void EnsureCellDisplay(DataGridCell cell, bool displayColumn) { if (cell.IsCurrent) @@ -304,6 +332,11 @@ namespace Avalonia.Controls.Primitives DesiredHeight = 0; } + internal void InvalidateChildIndex() + { + _childIndexChanged?.Invoke(this, ChildIndexChangedEventArgs.Empty); + } + private bool ShouldDisplayCell(DataGridColumn column, double frozenLeftEdge, double scrollingLeftEdge) { if (!column.IsVisible) diff --git a/src/Avalonia.Controls.DataGrid/Primitives/DataGridColumnHeadersPresenter.cs b/src/Avalonia.Controls.DataGrid/Primitives/DataGridColumnHeadersPresenter.cs index 4eed119240..108dc8ded7 100644 --- a/src/Avalonia.Controls.DataGrid/Primitives/DataGridColumnHeadersPresenter.cs +++ b/src/Avalonia.Controls.DataGrid/Primitives/DataGridColumnHeadersPresenter.cs @@ -3,8 +3,10 @@ // Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details. // All other rights reserved. +using Avalonia.LogicalTree; using Avalonia.Media; using System; +using System.Collections.Specialized; using System.Diagnostics; namespace Avalonia.Controls.Primitives @@ -13,10 +15,11 @@ namespace Avalonia.Controls.Primitives /// Used within the template of a to specify the /// location in the control's visual tree where the column headers are to be added. /// - public sealed class DataGridColumnHeadersPresenter : Panel + public sealed class DataGridColumnHeadersPresenter : Panel, IChildIndexProvider { private Control _dragIndicator; private IControl _dropLocationIndicator; + private EventHandler _childIndexChanged; /// /// Tracks which column is currently being dragged. @@ -104,6 +107,25 @@ namespace Avalonia.Controls.Primitives set; } + event EventHandler IChildIndexProvider.ChildIndexChanged + { + add => _childIndexChanged += value; + remove => _childIndexChanged -= value; + } + + int IChildIndexProvider.GetChildIndex(ILogical child) + { + return child is DataGridColumnHeader header + ? OwningGrid.ColumnsInternal.GetColumnDisplayIndex(header.ColumnIndex) + : throw new InvalidOperationException("Invalid cell type"); + } + + bool IChildIndexProvider.TryGetTotalCount(out int count) + { + count = OwningGrid.ColumnsInternal.VisibleColumnCount; + return true; + } + /// /// Arranges the content of the . /// @@ -391,5 +413,17 @@ namespace Avalonia.Controls.Primitives OwningGrid.ColumnsInternal.EnsureVisibleEdgedColumnsWidth(); return new Size(OwningGrid.ColumnsInternal.VisibleEdgedColumnsWidth, height); } + + protected override void ChildrenChanged(object sender, NotifyCollectionChangedEventArgs e) + { + base.ChildrenChanged(sender, e); + + InvalidateChildIndex(); + } + + internal void InvalidateChildIndex() + { + _childIndexChanged?.Invoke(this, ChildIndexChangedEventArgs.Empty); + } } } diff --git a/src/Avalonia.Controls.DataGrid/Primitives/DataGridRowsPresenter.cs b/src/Avalonia.Controls.DataGrid/Primitives/DataGridRowsPresenter.cs index 308ebc69d4..5d82689eff 100644 --- a/src/Avalonia.Controls.DataGrid/Primitives/DataGridRowsPresenter.cs +++ b/src/Avalonia.Controls.DataGrid/Primitives/DataGridRowsPresenter.cs @@ -7,8 +7,8 @@ using System; using System.Diagnostics; using Avalonia.Input; -using Avalonia.Input.GestureRecognizers; using Avalonia.Layout; +using Avalonia.LogicalTree; using Avalonia.Media; namespace Avalonia.Controls.Primitives @@ -17,8 +17,10 @@ namespace Avalonia.Controls.Primitives /// Used within the template of a to specify the /// location in the control's visual tree where the rows are to be added. /// - public sealed class DataGridRowsPresenter : Panel + public sealed class DataGridRowsPresenter : Panel, IChildIndexProvider { + private EventHandler _childIndexChanged; + public DataGridRowsPresenter() { AddHandler(Gestures.ScrollGestureEvent, OnScrollGesture); @@ -44,6 +46,29 @@ namespace Avalonia.Controls.Primitives } } + event EventHandler IChildIndexProvider.ChildIndexChanged + { + add => _childIndexChanged += value; + remove => _childIndexChanged -= value; + } + + int IChildIndexProvider.GetChildIndex(ILogical child) + { + return child is DataGridRow row + ? row.Index + : throw new InvalidOperationException("Invalid DataGrid child"); + } + + bool IChildIndexProvider.TryGetTotalCount(out int count) + { + return OwningGrid.DataConnection.TryGetCount(false, true, out count); + } + + internal void InvalidateChildIndex(DataGridRow row) + { + _childIndexChanged?.Invoke(this, new ChildIndexChangedEventArgs(row)); + } + /// /// Arranges the content of the . /// diff --git a/src/Avalonia.Controls.DataGrid/Themes/Default.xaml b/src/Avalonia.Controls.DataGrid/Themes/Default.xaml index 8d4e327f3e..0d1fe43eb6 100644 --- a/src/Avalonia.Controls.DataGrid/Themes/Default.xaml +++ b/src/Avalonia.Controls.DataGrid/Themes/Default.xaml @@ -12,23 +12,32 @@ - - - - - + + + + + + + + @@ -102,22 +116,35 @@ + + + + + @@ -180,57 +188,58 @@ - - - - - - - - - - - - - - + + + + + + + + + + + + + - - - + Fill="{TemplateBinding SeparatorBrush}" + IsVisible="{TemplateBinding AreSeparatorsVisible}" /> + + + + + - + @@ -271,38 +280,51 @@ - - - - - - - - + + + + + + + - + DataGridFrozenGrid.IsFrozen="True" /> + + - + + + + + @@ -430,9 +452,12 @@ Width="12" Height="12" Margin="12,0,0,0" + BorderBrush="{TemplateBinding BorderBrush}" + BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" - Foreground="{TemplateBinding Foreground}" - Focusable="False" /> + CornerRadius="{TemplateBinding CornerRadius}" + Focusable="False" + Foreground="{TemplateBinding Foreground}" /> - - + CornerRadius="{TemplateBinding CornerRadius}"> + diff --git a/src/Avalonia.Controls/Calendar/DateTimeHelper.cs b/src/Avalonia.Controls/Calendar/DateTimeHelper.cs index eb90f6c399..7a5c74a51b 100644 --- a/src/Avalonia.Controls/Calendar/DateTimeHelper.cs +++ b/src/Avalonia.Controls/Calendar/DateTimeHelper.cs @@ -68,10 +68,7 @@ namespace Avalonia.Controls public static DateTime DiscardDayTime(DateTime d) { - int year = d.Year; - int month = d.Month; - DateTime newD = new DateTime(year, month, 1, 0, 0, 0); - return newD; + return new DateTime(d.Year, d.Month, 1, 0, 0, 0); } [return: NotNullIfNotNull("d")] diff --git a/src/Avalonia.Controls/ItemsControl.cs b/src/Avalonia.Controls/ItemsControl.cs index 0cd72dc91c..114aa9727d 100644 --- a/src/Avalonia.Controls/ItemsControl.cs +++ b/src/Avalonia.Controls/ItemsControl.cs @@ -166,7 +166,7 @@ namespace Avalonia.Controls if (Presenter is IChildIndexProvider innerProvider) { innerProvider.ChildIndexChanged += PresenterChildIndexChanged; - _childIndexChanged?.Invoke(this, new ChildIndexChangedEventArgs()); + _childIndexChanged?.Invoke(this, ChildIndexChangedEventArgs.Empty); } } diff --git a/src/Avalonia.Controls/Panel.cs b/src/Avalonia.Controls/Panel.cs index 482a7fab84..2230b4b0d2 100644 --- a/src/Avalonia.Controls/Panel.cs +++ b/src/Avalonia.Controls/Panel.cs @@ -147,7 +147,7 @@ namespace Avalonia.Controls throw new NotSupportedException(); } - _childIndexChanged?.Invoke(this, new ChildIndexChangedEventArgs()); + _childIndexChanged?.Invoke(this, ChildIndexChangedEventArgs.Empty); InvalidateMeasureOnChildrenChanged(); } diff --git a/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs b/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs index f938c8d437..2821fa8cf0 100644 --- a/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs +++ b/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs @@ -158,7 +158,7 @@ namespace Avalonia.Controls.Presenters { ItemsChanged(e); - _childIndexChanged?.Invoke(this, new ChildIndexChangedEventArgs()); + _childIndexChanged?.Invoke(this, ChildIndexChangedEventArgs.Empty); } }