feat: Reconstruct the user multi-select component

aspnet-core/modules/elsa/LINGYUN.Abp.ElsaNext.Notifications/LINGYUN/Abp/ElsaNext/Notifications/Activities/SendNotification.cs

@@ -61,7 +61,7 @@ public class SendNotification : CodeActivity
 
     [Input(
         Description = "The recipients email addresses.", 
-        UIHint = AbpElsaUIHints.UserPicker)]
+        UIHint = AbpElsaUIHints.UserPickerMultiple)]
     public Input<ICollection<Guid>> To { get; set; } = null!;
 
     [Input(

aspnet-core/modules/elsa/LINGYUN.Abp.ElsaNext.Studio.Identity.Blazor/Components/IdentityUserPicker.razor

@@ -1,6 +1,7 @@
 @using Elsa.Api.Client.Shared.UIHints.DropDown
 @using Elsa.Studio.Models
 @using LINGYUN.Abp.ElsaNext.Studio.Blazor.Components
+@using System.Text.Json
 @using Volo.Abp.Identity
 @inject ILocalizer Localizer
 
@@ -13,33 +14,41 @@
 
 <ExpressionInput EditorContext="@EditorContext">
     <ChildContent>
-        <MudTextFieldEx Value="@(_selectedItem?.Text ?? string.Empty)"
-                            Label="@Localizer[displayName]"
-                            HelperText="@Localizer[description]"
-                            Variant="Variant.Outlined"
-                            Margin="Margin.Dense"
-                            ReadOnly="true"
-                            Disabled="EditorContext.IsReadOnly"
-                            OnFieldClick="@(_ => OpenSelectDialogAsync())"
-                            AdornmentIcons="GetAdornmentIcons()" />
+        <MudTextFieldEx Value="@SelectedText"
+                        Label="@Localizer[displayName]"
+                        HelperText="@Localizer[description]"
+                        Variant="Variant.Outlined"
+                        Margin="Margin.Dense"
+                        ReadOnly="true"
+                        Disabled="EditorContext.IsReadOnly"
+                        OnFieldClick="@(_ => OpenSelectDialogAsync())"
+                        AdornmentIcons="GetAdornmentIcons()" />
     </ChildContent>
 </ExpressionInput>
 
 @code {
-    private SelectListItem? _selectedItem;
+    private readonly List<SelectListItem> _selectedItems = [];
+
+    [Parameter] public bool AllowMultiple { get; set; }
 
     [Parameter] public DisplayInputEditorContext EditorContext { get; set; } = null!;
 
     [Inject] protected IIdentityUserRepository IdentityUserRepository { get; set; } = null!;
     [Inject] protected IDialogService DialogService { get; set; } = null!;
 
+    private string SelectedText => string.Join(", ", _selectedItems.Select(x => x.Text));
+
     protected override async Task OnInitializedAsync()
     {
-        var selectedItem = await ResolveSelectedItemAsync();
+        var selectedItems = await ResolveSelectedItemsAsync();
 
-        if (selectedItem != null)
+        if (selectedItems.Count > 0)
         {
-            await InvokeAsync(() => _selectedItem = selectedItem);
+            await InvokeAsync(() =>
+            {
+                _selectedItems.Clear();
+                _selectedItems.AddRange(selectedItems);
+            });
         }
     }
 
@@ -54,7 +63,9 @@
         var parameters = new DialogParameters<IdentityUserSelectDialog>
         {
             { x => x.Title, Localizer[inputDescriptor.DisplayName ?? inputDescriptor.Name] },
-            { x => x.SelectedValue, _selectedItem?.Value }
+            { x => x.AllowMultiple, AllowMultiple },
+            { x => x.SelectedValue, _selectedItems.FirstOrDefault()?.Value },
+            { x => x.SelectedValues, _selectedItems.Select(x => x.Value).ToArray() }
         };
         var options = new DialogOptions
         {
@@ -66,12 +77,31 @@
         var dialog = await DialogService.ShowAsync<IdentityUserSelectDialog>(string.Empty, parameters, options);
         var result = await dialog.Result;
 
-        if (result is { Canceled: false, Data: SelectListItem item })
+        if (result is not { Canceled: false })
+        {
+            return;
+        }
+
+        if (result.Data is SelectListItem selectedItem)
+        {
+            await InvokeAsync(async () =>
+            {
+                _selectedItems.Clear();
+                _selectedItems.Add(selectedItem);
+                await EditorContext.UpdateValueOrLiteralExpressionAsync(selectedItem.Value);
+            });
+
+            return;
+        }
+
+        if (result.Data is IReadOnlyList<SelectListItem> selectedItems)
         {
             await InvokeAsync(async () =>
             {
-                _selectedItem = item;
-                await EditorContext.UpdateValueOrLiteralExpressionAsync(item.Value);
+                _selectedItems.Clear();
+                _selectedItems.AddRange(selectedItems);
+
+                await EditorContext.UpdateValueOrObjectExpressionAsync(_selectedItems.Select(x => x.Value).ToList());
             });
         }
     }
@@ -89,7 +119,7 @@
         {
             Icon = Icons.Material.Filled.Clear,
             Tooltip = Localizer["Clear"],
-            Visible = _selectedItem != null,
+            Visible = _selectedItems.Count > 0,
             Disabled = EditorContext.IsReadOnly,
             OnClick = ClearAsync
         }
@@ -99,18 +129,33 @@
     {
         await InvokeAsync(async () =>
         {
-            _selectedItem = null;
-            await EditorContext.UpdateValueOrLiteralExpressionAsync(string.Empty);
+            _selectedItems.Clear();
+
+            if (AllowMultiple)
+            {
+                await EditorContext.UpdateValueOrObjectExpressionAsync(new List<string>());
+            }
+            else
+            {
+                await EditorContext.UpdateValueOrLiteralExpressionAsync(string.Empty);
+            }
         });
     }
 
-    private async Task<SelectListItem?> ResolveSelectedItemAsync()
+    private async Task<IReadOnlyList<SelectListItem>> ResolveSelectedItemsAsync()
+    {
+        return AllowMultiple
+            ? await ResolveSelectedUsersAsync()
+            : await ResolveSelectedUserAsync();
+    }
+
+    private async Task<IReadOnlyList<SelectListItem>> ResolveSelectedUserAsync()
     {
         var value = EditorContext.GetLiteralValueOrDefault();
 
         if (string.IsNullOrWhiteSpace(value))
         {
-            return null;
+            return [];
         }
 
         if (Guid.TryParse(value, out var userId))
@@ -119,10 +164,63 @@
 
             if (user != null)
             {
-                return new SelectListItem(user.Name ?? user.UserName, user.Id.ToString());
+                return [new SelectListItem(user.Name ?? user.UserName, user.Id.ToString())];
             }
         }
 
-        return new SelectListItem(value, value);
+        return [new SelectListItem(value, value)];
+    }
+
+    private async Task<IReadOnlyList<SelectListItem>> ResolveSelectedUsersAsync()
+    {
+        var values = ParseSelectedValues(EditorContext.GetObjectValueOrDefault());
+
+        if (values.Count == 0)
+        {
+            return [];
+        }
+
+        var userIds = values.Where(x => Guid.TryParse(x, out _)).Select(Guid.Parse).ToList();
+        List<IdentityUser> users = [];
+
+        if (userIds.Count > 0)
+        {
+            users = await IdentityUserRepository.GetListByIdsAsync(userIds);
+        }
+
+        var names = users.ToDictionary(x => x.Id.ToString(), x => x.Name ?? x.UserName, StringComparer.OrdinalIgnoreCase);
+
+        return values
+            .Select(value => new SelectListItem(names.TryGetValue(value, out var name) ? name : value, value))
+            .ToList();
+    }
+
+    private static IReadOnlyList<string> ParseSelectedValues(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return [];
+        }
+
+        var trimmed = value.Trim();
+
+        try
+        {
+            if (trimmed.StartsWith('['))
+            {
+                return JsonSerializer.Deserialize<List<string>>(trimmed) ?? [];
+            }
+
+            if (trimmed.StartsWith('"'))
+            {
+                var single = JsonSerializer.Deserialize<string>(trimmed);
+                return string.IsNullOrWhiteSpace(single) ? [] : [single];
+            }
+        }
+        catch (JsonException)
+        {
+        }
+
+        return trimmed.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
     }
 }

aspnet-core/modules/elsa/LINGYUN.Abp.ElsaNext.Studio.Identity.Blazor/Components/IdentityUserSelectDialog.razor

@@ -27,6 +27,9 @@
                       Dense="true"
                       Hover="true"
                       Breakpoint="Breakpoint.None"
+                      MultiSelection="@AllowMultiple"
+                      SelectedItems="_selectedItems"
+                      SelectedItemsChanged="OnSelectedItemsChanged"
                       OnRowClick="OnRowClickAsync">
                 <HeaderContent>
                     <MudTh>@Localizer["Name"]</MudTh>
@@ -35,7 +38,14 @@
                 <RowTemplate>
                     <MudTd DataLabel="@Localizer["Name"]">@context.Text</MudTd>
                     <MudTd DataLabel="" Style="text-align:right">
-                        @if (context.Value == SelectedValue)
+                        @if (AllowMultiple)
+                        {
+                            @if (_selectedItems.Contains(context))
+                            {
+                                <MudIcon Icon="@Icons.Material.Filled.Check" Color="Color.Success" Size="Size.Small" />
+                            }
+                        }
+                        else if (context.Value == SelectedValue)
                         {
                             <MudIcon Icon="@Icons.Material.Filled.Check" Color="Color.Success" Size="Size.Small" />
                         }
@@ -54,6 +64,10 @@
         </MudStack>
     </DialogContent>
     <DialogActions>
+        @if (AllowMultiple)
+        {
+            <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="ConfirmAsync">@Localizer["Select"]</MudButton>
+        }
         <MudButton Variant="Variant.Text" OnClick="CancelAsync">@Localizer["Cancel"]</MudButton>
     </DialogActions>
 </MudDialog>
@@ -63,14 +77,19 @@
 
     private MudTable<SelectListItem>? _table;
     private string? _searchText;
+    private HashSet<SelectListItem> _selectedItems = [];
     private CancellationTokenSource? _debounceCancellationTokenSource;
 
     [CascadingParameter] private IMudDialogInstance MudDialog { get; set; } = null!;
 
     [Parameter] public string Title { get; set; } = string.Empty;
 
+    [Parameter] public bool AllowMultiple { get; set; }
+
     [Parameter] public string? SelectedValue { get; set; }
 
+    [Parameter] public IReadOnlyCollection<string> SelectedValues { get; set; } = [];
+
     [Inject] protected IIdentityUserRepository IdentityUserRepository { get; set; } = null!;
 
     public void Dispose()
@@ -119,9 +138,23 @@
             cancellationToken: cancellationToken);
 
         var items = users
-            .Select(user => new SelectListItem(user.Name ?? user.UserName, user.Id.ToString()))
+            .Select(user => new SelectListItem(
+                user.Name.IsNullOrWhiteSpace() ? user.UserName : user.Name, 
+                user.Id.ToString()))
             .ToList();
 
+        if (AllowMultiple && SelectedValues.Count > 0)
+        {
+            var selectedItems = new HashSet<SelectListItem>(_selectedItems);
+
+            foreach (var item in items.Where(x => SelectedValues.Contains(x.Value)))
+            {
+                selectedItems.Add(item);
+            }
+
+            _selectedItems = selectedItems;
+        }
+
         return new TableData<SelectListItem>
         {
             Items = items,
@@ -129,9 +162,43 @@
         };
     }
 
+    private void OnSelectedItemsChanged(HashSet<SelectListItem> selectedItems)
+    {
+        _selectedItems = selectedItems;
+    }
+
     private async Task OnRowClickAsync(TableRowClickEventArgs<SelectListItem> args)
     {
-        await SelectAsync(args.Item);
+        if (!AllowMultiple)
+        {
+            await SelectAsync(args.Item);
+            return;
+        }
+
+        ToggleSelection(args.Item);
+    }
+
+    private void ToggleSelection(SelectListItem? item)
+    {
+        if (item == null)
+        {
+            return;
+        }
+
+        var selectedItems = new HashSet<SelectListItem>(_selectedItems);
+
+        if (!selectedItems.Remove(item))
+        {
+            selectedItems.Add(item);
+        }
+
+        _selectedItems = selectedItems;
+    }
+
+    private Task ConfirmAsync()
+    {
+        MudDialog.Close(DialogResult.Ok<IReadOnlyList<SelectListItem>>(_selectedItems.ToList()));
+        return Task.CompletedTask;
     }
 
     private Task SelectAsync(SelectListItem? item)

aspnet-core/modules/elsa/LINGYUN.Abp.ElsaNext.Studio.Identity.Blazor/Handlers/IdentityPickerHandler.cs

@@ -1,4 +1,4 @@
-using Elsa.Studio;
+using Elsa.Studio;
 using Elsa.Studio.Contracts;
 using Elsa.Studio.Models;
 using LINGYUN.Abp.ElsaNext.Studio.Identity.Blazor.Components;
@@ -9,16 +9,19 @@ namespace LINGYUN.Abp.ElsaNext.Studio.Identity.Blazor.Handlers;
 
 public class IdentityPickerHandler : IUIHintHandler
 {
-    public bool GetSupportsUIHint(string uiHint) => uiHint is AbpElsaUIHints.UserPicker;
+    public bool GetSupportsUIHint(string uiHint) => uiHint is AbpElsaUIHints.UserPicker or AbpElsaUIHints.UserPickerMultiple;
 
     public string UISyntax => WellKnownSyntaxNames.Object;
 
     public RenderFragment DisplayInputEditor(DisplayInputEditorContext context)
     {
+        var allowMultiple = context.InputDescriptor.UIHint == AbpElsaUIHints.UserPickerMultiple;
+
         return builder =>
         {
             builder.OpenComponent(0, typeof(IdentityUserPicker));
             builder.AddAttribute(1, nameof(IdentityUserPicker.EditorContext), context);
+            builder.AddAttribute(2, nameof(IdentityUserPicker.AllowMultiple), true);
             builder.CloseComponent();
         };
     }