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Add multi-select context menu support (rmcrackan/Libation#1195)

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This commit is contained in:
Michael Bucari-Tovo 2025-03-21 16:38:55 -06:00
parent bfcd226795
commit c77f2e2162
10 changed files with 455 additions and 229 deletions
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64
Source/LibationAvalonia/Controls/DataGridContextMenus.cs
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@ -2,6 +2,7 @@
using Avalonia.Controls;
using LibationUiBase.GridView;
using System;
using System.Linq;
using System.Reflection;
namespace LibationAvalonia.Controls
@ -12,11 +13,13 @@ namespace LibationAvalonia.Controls
private static readonly ContextMenu ContextMenu = new();
private static readonly AvaloniaList<Control> MenuItems = new();
private static readonly PropertyInfo OwningColumnProperty;
private static readonly PropertyInfo OwningGridProperty;
static DataGridContextMenus()
{
ContextMenu.ItemsSource = MenuItems;
OwningColumnProperty = typeof(DataGridCell).GetProperty("OwningColumn", BindingFlags.Instance | BindingFlags.NonPublic);
OwningGridProperty = typeof(DataGridColumn).GetProperty("OwningGrid", BindingFlags.Instance | BindingFlags.NonPublic);
}
public static void AttachContextMenu(this DataGridCell cell)
@ -30,19 +33,35 @@ namespace LibationAvalonia.Controls
private static void Cell_ContextRequested(object sender, ContextRequestedEventArgs e)
{
if (sender is DataGridCell cell && cell.DataContext is IGridEntry entry)
if (sender is DataGridCell cell &&
cell.DataContext is IGridEntry clickedEntry &&
OwningColumnProperty.GetValue(cell) is DataGridColumn column &&
OwningGridProperty.GetValue(column) is DataGrid grid)
{
var allSelected = grid.SelectedItems.OfType<IGridEntry>().ToArray();
var clickedIndex = Array.IndexOf(allSelected, clickedEntry);
if (clickedIndex == -1)
{
//User didn't right-click on a selected cell
grid.SelectedItem = clickedEntry;
allSelected = [clickedEntry];
}
else if (clickedIndex > 0)
{
//Ensure the clicked entry is first in the list
(allSelected[0], allSelected[clickedIndex]) = (allSelected[clickedIndex], allSelected[0]);
}
var args = new DataGridCellContextMenuStripNeededEventArgs
{
Column = OwningColumnProperty.GetValue(cell) as DataGridColumn,
GridEntry = entry,
Column = column,
Grid = grid,
GridEntries = allSelected,
ContextMenu = ContextMenu
};
args.ContextMenuItems.Clear();
CellContextMenuStripNeeded?.Invoke(sender, args);
e.Handled = args.ContextMenuItems.Count == 0;
}
else
@ -61,10 +80,37 @@ namespace LibationAvalonia.Controls
private static string GetCellValue(DataGridColumn column, object item)
=> GetCellValueMethod.Invoke(column, new object[] { item, column.ClipboardContentBinding })?.ToString() ?? "";
public string CellClipboardContents => GetCellValue(Column, GridEntry);
public DataGridColumn Column { get; init; }
public IGridEntry GridEntry { get; init; }
public ContextMenu ContextMenu { get; init; }
public string CellClipboardContents => GetCellValue(Column, GridEntries[0]);
public string GetRowClipboardContents()
{
if (GridEntries is null || GridEntries.Length == 0)
return string.Empty;
else if (GridEntries.Length == 1)
return HeaderNames + Environment.NewLine + GetRowClipboardContents(GridEntries[0]);
else
return string.Join(Environment.NewLine, GridEntries.Select(GetRowClipboardContents).Prepend(HeaderNames));
}
private string HeaderNames
=> string.Join("\t",
Grid.Columns
.Where(c => c.IsVisible)
.OrderBy(c => c.DisplayIndex)
.Select(c => RemoveLineBreaks(c.Header.ToString())));
private static string RemoveLineBreaks(string text)
=> text.Replace("\r\n", "").Replace('\r', ' ').Replace('\n', ' ');
private string GetRowClipboardContents(IGridEntry gridEntry)
{
var contents = Grid.Columns.Where(c => c.IsVisible).OrderBy(c => c.DisplayIndex).Select(c => RemoveLineBreaks(GetCellValue(c, gridEntry))).ToArray();
return string.Join("\t", contents);
}
public required DataGrid Grid { get; init; }
public required DataGridColumn Column { get; init; }
public required IGridEntry[] GridEntries { get; init; }
public required ContextMenu ContextMenu { get; init; }
public AvaloniaList<Control> ContextMenuItems
=> ContextMenu.ItemsSource as AvaloniaList<Control>;
}