"Vorgang": Fallmappe für Klassenbuch- und Dokumentationseinträge

Neuer 4. Tab in der Klassenlehreransicht: bündelt Titel, Beschreibung, Schlagwörter, verknüpfte Dokumentation und angeheftete (eingefrorene) WebUntis-Klassenbucheinträge zu einem laufenden Problem mit einer/einem oder mehreren Schüler*innen. Anheften direkt aus dem Klassenbuch-Tab per Rechtsklick. Sync-fähig nach dem bestehenden Documentation-Muster. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-09-01 22:42:06 +02:00
parent 987b49e761
commit 15463bc292
23 changed files with 1191 additions and 5 deletions
@@ -162,6 +162,7 @@ public static class AppBootstrapper
        services.AddSingleton<IUnitRepository,          UnitRepository>();
        services.AddSingleton<ILessonRepository,        LessonRepository>();
        services.AddSingleton<IDocumentationRepository, DocumentationRepository>();
+        services.AddSingleton<IVorgangRepository,       VorgangRepository>();
        services.AddSingleton<IWorkTaskRepository,          WorkTaskRepository>();
        services.AddSingleton<ITimeEntryRepository,         TimeEntryRepository>();
        services.AddSingleton<IParticipationSessionRepository, ParticipationSessionRepository>();
@@ -315,6 +316,7 @@ public static class AppBootstrapper
        services.AddSingleton<WorkloadEvaluationViewModel>();
        services.AddSingleton<WorkloadViewModel>();
        services.AddSingleton<ClassTeacherDetailsViewModel>();
+        services.AddSingleton<ClassTeacherCasesViewModel>();
        services.AddSingleton<ClassTeacherOverviewViewModel>();
        services.AddSingleton<ExamsOverviewViewModel>();

@@ -0,0 +1,235 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Desktop.Services;
+using LehrerApp.Desktop.ViewModels.Students;
+
+namespace LehrerApp.Desktop.ViewModels.ClassTeacher;
+
+/// <summary>
+/// "Vorgänge"-Tab der Klassenlehreransicht: Fallmappen für konkrete, laufende Probleme mit einer/
+/// einem oder mehreren Schüler*innen der Klasse, die Dokumentation und (eingefrorene) WebUntis-
+/// Klassenbucheinträge bündeln. Löst wie <see cref="ClassTeacherDetailsViewModel"/> die Untis-
+/// Roster-Namen der Klasse auf lokale <see cref="Student"/>-Datensätze auf (bewusst ein eigener,
+/// nicht geteilter Abgleich — dasselbe kleine Muster steckt schon zweimal im Code, siehe
+/// <see cref="ClassTeacherOverviewViewModel.MatchStudent"/>, eine gemeinsame Abstraktion dafür ist
+/// hier nicht Teil der Aufgabe).
+/// </summary>
+public partial class ClassTeacherCasesViewModel : ObservableObject
+{
+    private readonly IVorgangRepository _vorgaenge;
+    private readonly IDocumentationRepository _documentation;
+    private readonly IStudentRepository _students;
+    private readonly UntisReportCacheService _cache;
+
+    private string _className = "";
+    private List<StudentOption> _rosterStudentOptions = [];
+
+    public ObservableCollection<VorgangItem> Cases { get; } = [];
+
+    [ObservableProperty] private bool _onlyOpen = true;
+    [ObservableProperty] private bool _busy;
+    [ObservableProperty] private string _status = "";
+
+    public bool HasCases => Cases.Count > 0;
+
+    public Func<List<StudentOption>, Vorgang?, Task<Vorgang?>>? OnEditVorgang { get; set; }
+    public Func<VorgangItem, Task<bool>>? OnConfirmDeleteVorgang { get; set; }
+    public Func<Guid, List<StudentOption>, Documentation?, Task<Documentation?>>? OnEditDocumentation { get; set; }
+
+    public ClassTeacherCasesViewModel(IVorgangRepository vorgaenge, IDocumentationRepository documentation,
+        IStudentRepository students, UntisReportCacheService cache)
+    {
+        _vorgaenge = vorgaenge;
+        _documentation = documentation;
+        _students = students;
+        _cache = cache;
+    }
+
+    public void Initialize(string className)
+    {
+        _className = className;
+        Cases.Clear();
+        Status = "Wird geladen…";
+        NotifyState();
+        _ = LoadInternal();
+    }
+
+    partial void OnOnlyOpenChanged(bool value) => _ = LoadInternal();
+
+    [RelayCommand]
+    private Task Refresh() => LoadInternal();
+
+    private async Task LoadInternal()
+    {
+        if (string.IsNullOrWhiteSpace(_className)) return;
+
+        // IsRevealed übersteht den Neuaufbau der Liste nicht automatisch (neue VorgangItem-Instanzen
+        // pro Load) - deshalb hier gemerkt und danach wiederhergestellt, sonst klappt eine gerade
+        // aufgeklappte Karte bei jeder Verknüpfungs-/Status-Aktion (die intern neu lädt) wieder zu.
+        var revealedIds = Cases.Where(c => c.IsRevealed).Select(c => c.Model.Id).ToHashSet();
+
+        Busy = true;
+        Cases.Clear();
+        NotifyState();
+        try
+        {
+            var roster = await _cache.GetStudentRosterAsync(_className);
+            var localStudents = _students.GetAll();
+            var matches = roster
+                .Select(r => (Roster: r, Student: ClassTeacherOverviewViewModel.MatchStudent(r.DisplayName, localStudents)))
+                .Where(x => x.Student is not null)
+                .Select(x => (StudentId: x.Student!.Id, DisplayName: x.Roster.DisplayName))
+                .DistinctBy(x => x.StudentId)
+                .ToList();
+            _rosterStudentOptions = matches.Select(m => new StudentOption(m.StudentId, m.DisplayName)).ToList();
+            var rosterIds = matches.Select(m => m.StudentId).ToHashSet();
+            var nameById = matches.ToDictionary(m => m.StudentId, m => m.DisplayName);
+
+            var relevant = _vorgaenge.GetAll().Where(v => v.StudentIds.Any(rosterIds.Contains));
+            if (OnlyOpen) relevant = relevant.Where(v => v.Status == VorgangStatus.Open);
+
+            var allDocs = _documentation.GetAll();
+            foreach (var vorgang in relevant.OrderByDescending(v => v.UpdatedAt))
+            {
+                var names = vorgang.StudentIds.Select(id => nameById.GetValueOrDefault(id, ""))
+                    .Where(n => n != "");
+                var item = new VorgangItem(vorgang, string.Join(", ", names), LinkDocumentation,
+                    UnlinkDocumentation, RemoveClassRegisterEntry) { IsRevealed = revealedIds.Contains(vorgang.Id) };
+
+                var linkedIds = vorgang.DocumentationIds.ToHashSet();
+                foreach (var doc in allDocs.Where(d => linkedIds.Contains(d.Id)))
+                    item.LinkedDocumentation.Add(new DocumentationItem(doc, nameById.GetValueOrDefault(doc.StudentId, "")));
+                foreach (var doc in FilterAvailableDocumentation(allDocs, vorgang))
+                    item.AvailableDocumentation.Add(new DocumentationItem(doc, nameById.GetValueOrDefault(doc.StudentId, "")));
+                foreach (var entry in vorgang.ClassRegisterEntries.OrderByDescending(e => e.Date))
+                    item.ClassRegisterRows.Add(new VorgangClassRegisterEntryRow(entry));
+
+                Cases.Add(item);
+            }
+            Status = OnlyOpen ? $"{Cases.Count} offene Vorgänge" : $"{Cases.Count} Vorgänge";
+        }
+        finally { Busy = false; NotifyState(); }
+    }
+
+    private void NotifyState() => OnPropertyChanged(nameof(HasCases));
+
+    [RelayCommand]
+    private async Task AddVorgang()
+    {
+        if (OnEditVorgang is null) return;
+        var result = await OnEditVorgang(_rosterStudentOptions, null);
+        if (result is null) return;
+        _vorgaenge.Save(result);
+        await LoadInternal();
+    }
+
+    [RelayCommand]
+    private async Task EditVorgang(VorgangItem? item)
+    {
+        if (item is null || OnEditVorgang is null) return;
+        var result = await OnEditVorgang(_rosterStudentOptions, item.Model);
+        if (result is null) return;
+        _vorgaenge.Save(result);
+        await LoadInternal();
+    }
+
+    [RelayCommand]
+    private async Task ToggleStatus(VorgangItem? item)
+    {
+        if (item is null) return;
+        item.Model.Status = item.Model.Status == VorgangStatus.Open ? VorgangStatus.Closed : VorgangStatus.Open;
+        item.Model.ClosedAt = item.Model.Status == VorgangStatus.Closed ? DateTime.UtcNow : null;
+        _vorgaenge.Save(item.Model);
+        await LoadInternal();
+    }
+
+    [RelayCommand]
+    private async Task DeleteVorgang(VorgangItem? item)
+    {
+        if (item is null) return;
+        if (OnConfirmDeleteVorgang is not null && !await OnConfirmDeleteVorgang(item)) return;
+        _vorgaenge.Delete(item.Model.Id);
+        await LoadInternal();
+    }
+
+    [RelayCommand]
+    private async Task CreateAndLinkDocumentation(VorgangItem? item)
+    {
+        if (item is null || OnEditDocumentation is null) return;
+        var studentOptions = _rosterStudentOptions.Where(s => item.Model.StudentIds.Contains(s.Id)).ToList();
+        var defaultStudentId = item.Model.StudentIds.FirstOrDefault();
+        var result = await OnEditDocumentation(defaultStudentId, studentOptions, null);
+        if (result is null) return;
+        _documentation.Save(result);
+        item.Model.DocumentationIds.Add(result.Id);
+        _vorgaenge.Save(item.Model);
+        await LoadInternal();
+    }
+
+    /// Dokumentation der Vorgangs-Schüler*innen, die noch nicht mit diesem Vorgang verknüpft ist —
+    /// reine, ohne Repository-Zugriff testbare Filterlogik (gleiches Muster wie
+    /// <see cref="ClassTeacherRosterRow.Build"/>).
+    public static List<Documentation> FilterAvailableDocumentation(IReadOnlyList<Documentation> allDocs, Vorgang vorgang)
+    {
+        var linkedIds = vorgang.DocumentationIds.ToHashSet();
+        return allDocs.Where(d => vorgang.StudentIds.Contains(d.StudentId) && !linkedIds.Contains(d.Id)).ToList();
+    }
+
+    private async Task LinkDocumentation(VorgangItem item, DocumentationItem doc)
+    {
+        item.Model.DocumentationIds.Add(doc.Model.Id);
+        _vorgaenge.Save(item.Model);
+        await LoadInternal();
+    }
+
+    private async Task UnlinkDocumentation(VorgangItem item, DocumentationItem doc)
+    {
+        item.Model.DocumentationIds.Remove(doc.Model.Id);
+        _vorgaenge.Save(item.Model);
+        await LoadInternal();
+    }
+
+    private async Task RemoveClassRegisterEntry(VorgangItem item, VorgangClassRegisterEntryRow row)
+    {
+        item.Model.ClassRegisterEntries.Remove(row.Model);
+        _vorgaenge.Save(item.Model);
+        await LoadInternal();
+    }
+
+    // ── Anheften eines Klassenbuch-Eintrags aus dem Klassenbuch-Tab (ClassTeacherDetailsViewModel,
+    //    per Konstruktor-Injection dieser Instanz — kein Func-Hook, da hier keine UI im Spiel ist,
+    //    nur Zugriff auf schon geladene Daten dieser Geschwister-ViewModel-Instanz) ────────────────
+
+    public IReadOnlyList<StudentOption> RosterStudentOptions => _rosterStudentOptions;
+
+    /// Offene Vorgänge, an die sich ein Klassenbuch-Eintrag für diese/n Schüler*in anheften lässt
+    /// (Namensabgleich wie beim restlichen Klassenlehrer-Bereich, siehe UntisNameMatching).
+    public List<VorgangItem> OpenCasesForStudent(string untisDisplayName)
+    {
+        var match = _rosterStudentOptions.FirstOrDefault(s =>
+            UntisNameMatching.NamesMatch(s.Name, untisDisplayName));
+        if (match is null) return [];
+        return Cases.Where(c => c.IsOpen && c.Model.StudentIds.Contains(match.Id)).ToList();
+    }
+
+    public async Task PinClassRegisterEntryAsync(Guid vorgangId, VorgangClassRegisterEntry entry)
+    {
+        var vorgang = _vorgaenge.GetById(vorgangId);
+        if (vorgang is null) return;
+        vorgang.ClassRegisterEntries.Add(entry);
+        _vorgaenge.Save(vorgang);
+        await LoadInternal();
+    }
+
+    public async Task<Vorgang> CreateAndPinAsync(string title, Guid studentId, VorgangClassRegisterEntry entry)
+    {
+        var vorgang = new Vorgang { Title = title, StudentIds = [studentId] };
+        vorgang.ClassRegisterEntries.Add(entry);
+        _vorgaenge.Save(vorgang);
+        await LoadInternal();
+        return vorgang;
+    }
+}
@@ -135,6 +135,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
    private readonly UntisReportCacheService _cache;
    private readonly IDocumentationRepository _documentation;
    private readonly IStudentRepository _students;
+    private readonly ClassTeacherCasesViewModel _cases;
    private string _className = "";
    private DateOnly _loadedStart;
    private DateOnly _loadedEnd;
@@ -149,6 +150,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
    public ObservableCollection<ClassTeacherCategoryAggregateRow> CategoryAggregates { get; } = [];
    public ObservableCollection<DocumentationItem> OwnDocumentationEntries { get; } = [];

+    /// Für das Kontextmenü "→ An Vorgang anheften" (DataGrid.SelectedItem, zweigleisig gebunden).
+    [ObservableProperty] private ClassTeacherClassRegisterRow? _selectedEntry;
+
    [ObservableProperty] private DateTimeOffset? _startDate = DateTimeOffset.Now.AddDays(-6);
    [ObservableProperty] private DateTimeOffset? _endDate = DateTimeOffset.Now;
    [ObservableProperty] private string _status = "Zeitraum wählen und laden.";
@@ -164,6 +168,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject

    public Func<List<StudentOption>, Documentation?, Task<Documentation?>>? OnEditOwnDocumentation { get; set; }
    public Func<DocumentationItem, Task<bool>>? OnConfirmDeleteOwnDocumentation { get; set; }
+    /// Zeigt die "→ Vorgang"-Auswahl für eine Klassenbuchzeile: bestehenden offenen Vorgang wählen
+    /// oder einen neuen Titel eingeben. Liefert null bei Abbruch.
+    public Func<ClassTeacherClassRegisterRow, Task<PinToVorgangChoice?>>? OnPickVorgangForPin { get; set; }

    public bool HasEntries => Entries.Count > 0;
    public bool HasAbsenceEntries => AbsenceEntries.Count > 0;
@@ -177,11 +184,12 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
        ? "Alle Schüler*innen" : StudentFilter;

    public ClassTeacherDetailsViewModel(UntisReportCacheService cache, IDocumentationRepository documentation,
-        IStudentRepository students)
+        IStudentRepository students, ClassTeacherCasesViewModel cases)
    {
        _cache = cache;
        _documentation = documentation;
        _students = students;
+        _cases = cases;
    }

    public void Initialize(string className)
@@ -359,6 +367,42 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
        LoadOwnDocumentationEntries();
    }

+    /// Für den "→ Vorgang"-Auswahldialog im Code-behind: offene Vorgänge, an die sich diese
+    /// Klassenbuchzeile anheften lässt (Durchreiche zur Geschwister-ViewModel-Instanz, siehe _cases).
+    public List<VorgangItem> OpenCasesFor(string studentName) => _cases.OpenCasesForStudent(studentName);
+
+    /// Heftet eine WebUntis-Klassenbuchzeile als eingefrorene Kopie an einen (ggf. neuen) Vorgang
+    /// im "Vorgänge"-Tab (<see cref="ClassTeacherCasesViewModel"/>) an — die Zeile selbst hat keine
+    /// stabile ID, deshalb Werte-Kopie statt Referenz (siehe VorgangClassRegisterEntry).
+    [RelayCommand]
+    private async Task PinToVorgang(ClassTeacherClassRegisterRow? row)
+    {
+        if (row is null || OnPickVorgangForPin is null) return;
+        var choice = await OnPickVorgangForPin(row);
+        if (choice is null) return;
+
+        var entry = BuildClassRegisterSnapshot(row);
+
+        if (choice.ExistingVorgangId is { } vorgangId)
+            await _cases.PinClassRegisterEntryAsync(vorgangId, entry);
+        else if (!string.IsNullOrWhiteSpace(choice.NewVorgangTitle))
+        {
+            var student = _cases.RosterStudentOptions
+                .FirstOrDefault(s => UntisNameMatching.NamesMatch(s.Name, row.StudentName));
+            if (student is null) return;
+            await _cases.CreateAndPinAsync(choice.NewVorgangTitle, student.Id, entry);
+        }
+    }
+
+    /// Baut die eingefrorene Klassenbuch-Kopie aus einer Zeile — reine, ohne Repository-Zugriff
+    /// testbare Umwandlung.
+    public static VorgangClassRegisterEntry BuildClassRegisterSnapshot(ClassTeacherClassRegisterRow row) => new()
+    {
+        Date = row.Date, StudentName = row.StudentName, Subject = row.Subject,
+        TeacherUsername = row.TeacherUsername, CategoryName = row.CategoryName,
+        CategoryGroup = row.CategoryGroup, Text = row.Text,
+    };
+
    // WebUntis liefert Namen je nach Bericht in anderer Reihenfolge als der Schülerreport, aus dem
    // StudentFilter beim Klick in der Übersicht gesetzt wird (siehe UntisNameMatching) - ein
    // exakter String-Vergleich hier ließ die gefilterten Listen fälschlich leer erscheinen.
@@ -322,6 +322,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
    private readonly AppLogger? _logger;

    public ClassTeacherDetailsViewModel DetailsTab { get; }
+    public ClassTeacherCasesViewModel CasesTab { get; }
    public ObservableCollection<ClassTeacherRosterRow> Roster { get; } = [];
    public ObservableCollection<ClassTeacherRosterRow> PrimaryRoster { get; } = [];
    public ObservableCollection<ClassTeacherRosterRow> SecondaryRoster { get; } = [];
@@ -406,7 +407,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
        UntisReportCacheService cache, SchoolYearService schoolYear, IWorkTaskRepository workTasks,
        IStudentRepository students, IDocumentationRepository documentation, IParticipationRepository participation,
        IParticipationSessionRepository participationSessions, ClassTeacherDetailsViewModel detailsTab,
-        AppLogger? logger = null)
+        ClassTeacherCasesViewModel casesTab, AppLogger? logger = null)
    {
        _settings = settings;
        _untis = untis;
@@ -419,6 +420,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
        _participationSessions = participationSessions;
        _logger = logger;
        DetailsTab = detailsTab;
+        CasesTab = casesTab;
    }

    partial void OnHomeroomClassNameChanged(string? value) => OnPropertyChanged(nameof(HomeroomClassConfigured));
@@ -451,6 +453,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject

        var className = HomeroomClassName!;
        DetailsTab.Initialize(className);
+        CasesTab.Initialize(className);
        Busy = true;
        NotifyRosterState();
        try
@@ -0,0 +1,204 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Models;
+using LehrerApp.Desktop.ViewModels.Students;
+
+namespace LehrerApp.Desktop.ViewModels.ClassTeacher;
+
+// ── Anzeige-Helfer ────────────────────────────────────────────────────────
+
+public static class VorgangTagDisplay
+{
+    // Vom Nutzer selbst genannte Schlagwörter — eigene Labels bleiben trotzdem frei möglich
+    // (AutoCompleteBox, gleiches Muster wie DocumentationTagDisplay.Suggestions).
+    public static string[] Suggestions { get; } =
+        ["Absentismus", "Hausaufgaben", "Verspätungen", "Konflikte", "Mitarbeit", "Elternkontakt", "Eskalation"];
+}
+
+public static class VorgangStatusDisplay
+{
+    public static string Label(VorgangStatus status) => status == VorgangStatus.Closed ? "Geschlossen" : "Offen";
+}
+
+/// Ergebnis des "→ Vorgang"-Auswahldialogs beim Anheften einer Klassenbuchzeile: entweder ein
+/// bestehender, offener Vorgang oder der Titel für einen neu anzulegenden.
+public sealed record PinToVorgangChoice(Guid? ExistingVorgangId, string? NewVorgangTitle);
+
+/// Eingefrorene WebUntis-Klassenbuchzeile mit deutscher Anzeige-Aufbereitung — das Core-Modell
+/// <see cref="VorgangClassRegisterEntry"/> bleibt bewusst framework-frei ohne Formatierungslogik.
+public sealed record VorgangClassRegisterEntryRow(VorgangClassRegisterEntry Model)
+{
+    public string DateLabel => Model.Date.ToString("dd.MM.yyyy");
+    public string StudentName => Model.StudentName;
+    public string SummaryLabel => string.Join(" · ", new[] { Model.Subject, Model.CategoryName, Model.Text }
+        .Where(v => !string.IsNullOrWhiteSpace(v)));
+}
+
+// ── Mehrfachauswahl Schüler*innen (Anlegen/Bearbeiten-Dialog) ────────────────
+
+public partial class VorgangStudentOption(Guid studentId, string name) : ObservableObject
+{
+    public Guid StudentId { get; } = studentId;
+    public string Name { get; } = name;
+    [ObservableProperty] private bool _isSelected;
+}
+
+// ── Listen-Eintrag mit aufklappbarer Detailansicht ───────────────────────────
+
+/// <summary>
+/// Ein Vorgang in der Liste des "Vorgänge"-Tabs. Verknüpfte Dokumentation/Klassenbucheinträge
+/// werden von <see cref="ClassTeacherCasesViewModel"/> beim Laden befüllt; Link/Unlink-Aktionen
+/// laufen über die hier übergebenen Callbacks zurück ins ViewModel (statt eigenem Repository-
+/// Zugriff hier), damit dieser Wrapper ein reiner Anzeige-Baustein bleibt — analog
+/// <see cref="DocumentationItem"/>.
+/// </summary>
+public partial class VorgangItem : ObservableObject
+{
+    private readonly Func<VorgangItem, DocumentationItem, Task> _onLink;
+    private readonly Func<VorgangItem, DocumentationItem, Task> _onUnlink;
+    private readonly Func<VorgangItem, VorgangClassRegisterEntryRow, Task> _onRemoveClassRegisterEntry;
+
+    public Vorgang Model { get; }
+    public string StudentNames { get; }
+    public List<TagChip> TagChips { get; }
+    public string StatusLabel => VorgangStatusDisplay.Label(Model.Status);
+    public bool IsOpen => Model.Status == VorgangStatus.Open;
+    public string CreatedLabel => $"Angelegt {Model.CreatedAt:dd.MM.yyyy}";
+
+    public ObservableCollection<DocumentationItem> LinkedDocumentation { get; } = [];
+    public ObservableCollection<DocumentationItem> AvailableDocumentation { get; } = [];
+    public ObservableCollection<VorgangClassRegisterEntryRow> ClassRegisterRows { get; } = [];
+
+    public bool HasLinkedDocumentation => LinkedDocumentation.Count > 0;
+    public bool HasAvailableDocumentation => AvailableDocumentation.Count > 0;
+    public bool HasClassRegisterRows => ClassRegisterRows.Count > 0;
+
+    [ObservableProperty] private bool _isRevealed;
+
+    public VorgangItem(Vorgang model, string studentNames,
+        Func<VorgangItem, DocumentationItem, Task> onLink,
+        Func<VorgangItem, DocumentationItem, Task> onUnlink,
+        Func<VorgangItem, VorgangClassRegisterEntryRow, Task> onRemoveClassRegisterEntry)
+    {
+        Model = model;
+        StudentNames = studentNames;
+        TagChips = model.Tags.Select(t => new TagChip(t)).ToList();
+        _onLink = onLink;
+        _onUnlink = onUnlink;
+        _onRemoveClassRegisterEntry = onRemoveClassRegisterEntry;
+    }
+
+    [RelayCommand] private void Reveal() => IsRevealed = !IsRevealed;
+
+    [RelayCommand]
+    private async Task Link(DocumentationItem? doc)
+    {
+        if (doc is not null) await _onLink(this, doc);
+    }
+
+    [RelayCommand]
+    private async Task Unlink(DocumentationItem? doc)
+    {
+        if (doc is not null) await _onUnlink(this, doc);
+    }
+
+    [RelayCommand]
+    private async Task RemoveClassRegisterEntry(VorgangClassRegisterEntryRow? row)
+    {
+        if (row is not null) await _onRemoveClassRegisterEntry(this, row);
+    }
+}
+
+// ── Dialog: Vorgang anlegen/bearbeiten ────────────────────────────────────
+
+public partial class VorgangDialogViewModel : ObservableObject
+{
+    private readonly Vorgang? _editing;
+
+    public ObservableCollection<VorgangStudentOption> StudentOptions { get; }
+
+    [ObservableProperty] private string _title = "";
+    [ObservableProperty] private string _description = "";
+    [ObservableProperty] private string _newTag = "";
+    public ObservableCollection<string> Tags { get; } = [];
+    public string[] TagSuggestions => VorgangTagDisplay.Suggestions;
+
+    [ObservableProperty] private string _titleError = "";
+    [ObservableProperty] private string _studentsError = "";
+
+    public string DialogTitle => _editing is null ? "Vorgang anlegen" : "Vorgang bearbeiten";
+    public Vorgang? Result { get; private set; }
+
+    public VorgangDialogViewModel(List<StudentOption> rosterStudents, Vorgang? editing)
+    {
+        _editing = editing;
+        StudentOptions = new ObservableCollection<VorgangStudentOption>(rosterStudents.Select(s =>
+            new VorgangStudentOption(s.Id, s.Name) { IsSelected = editing?.StudentIds.Contains(s.Id) == true }));
+        if (editing is null) return;
+
+        Title = editing.Title;
+        Description = editing.Description;
+        foreach (var tag in editing.Tags) Tags.Add(tag);
+    }
+
+    [RelayCommand]
+    private void AddTag()
+    {
+        if (string.IsNullOrWhiteSpace(NewTag)) return;
+        var tag = NewTag.Trim();
+        if (!Tags.Contains(tag)) Tags.Add(tag);
+        NewTag = "";
+    }
+
+    [RelayCommand] private void RemoveTag(string? tag) { if (tag is not null) Tags.Remove(tag); }
+
+    [RelayCommand]
+    private void Save()
+    {
+        TitleError = ""; StudentsError = "";
+        var valid = true;
+
+        if (string.IsNullOrWhiteSpace(Title)) { TitleError = "Titel erforderlich."; valid = false; }
+        var selectedIds = StudentOptions.Where(s => s.IsSelected).Select(s => s.StudentId).ToList();
+        if (selectedIds.Count == 0) { StudentsError = "Mindestens eine/n Schüler*in auswählen."; valid = false; }
+
+        if (!valid) return;
+
+        Result = _editing ?? new Vorgang();
+        Result.Title = Title.Trim();
+        Result.Description = (Description ?? "").Trim();
+        Result.StudentIds = selectedIds;
+        Result.Tags = Tags.ToList();
+    }
+}
+
+// ── Dialog: Klassenbuchzeile an (bestehenden oder neuen) Vorgang anheften ────
+
+public partial class PinToVorgangDialogViewModel : ObservableObject
+{
+    public string RowSummary { get; }
+    public List<VorgangItem> MatchingOpenCases { get; }
+    public bool HasMatchingOpenCases => MatchingOpenCases.Count > 0;
+
+    [ObservableProperty] private VorgangItem? _selectedCase;
+    [ObservableProperty] private string _newTitle = "";
+    [ObservableProperty] private string _error = "";
+
+    public PinToVorgangChoice? Result { get; private set; }
+
+    public PinToVorgangDialogViewModel(string rowSummary, List<VorgangItem> matchingOpenCases)
+    {
+        RowSummary = rowSummary;
+        MatchingOpenCases = matchingOpenCases;
+    }
+
+    [RelayCommand]
+    private void Confirm()
+    {
+        Error = "";
+        if (SelectedCase is not null) { Result = new PinToVorgangChoice(SelectedCase.Model.Id, null); return; }
+        if (!string.IsNullOrWhiteSpace(NewTitle)) { Result = new PinToVorgangChoice(null, NewTitle.Trim()); return; }
+        Error = "Bestehenden Vorgang wählen oder Titel für einen neuen Vorgang eingeben.";
+    }
+}
@@ -0,0 +1,187 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.ClassTeacher"
+             xmlns:svm="clr-namespace:LehrerApp.Desktop.ViewModels.Students"
+             x:Class="LehrerApp.Desktop.Views.ClassTeacher.ClassTeacherCasesView"
+             x:DataType="vm:ClassTeacherCasesViewModel">
+
+  <UserControl.Styles>
+    <Style Selector="Border.statusPill">
+      <Setter Property="CornerRadius" Value="10"/>
+      <Setter Property="Padding" Value="8,2"/>
+    </Style>
+    <Style Selector="Border.statusPill.open">
+      <Setter Property="Background" Value="#FB8C00"/>
+    </Style>
+    <Style Selector="Border.statusPill.closed">
+      <Setter Property="Background" Value="#43A047"/>
+    </Style>
+    <Style Selector="Border.statusPill TextBlock">
+      <Setter Property="Foreground" Value="White"/>
+      <Setter Property="FontSize" Value="11"/>
+      <Setter Property="FontWeight" Value="SemiBold"/>
+    </Style>
+  </UserControl.Styles>
+
+  <Grid RowDefinitions="Auto,Auto,*" Margin="16" RowSpacing="10">
+    <Grid Grid.Row="0" ColumnDefinitions="*,Auto,Auto">
+      <StackPanel Grid.Column="0">
+        <TextBlock Text="Vorgänge" FontSize="22" FontWeight="SemiBold"/>
+        <TextBlock Text="Fallmappen für laufende Probleme mit einer/einem oder mehreren Schüler*innen der Klasse"
+                   FontSize="12" Opacity="0.55"/>
+      </StackPanel>
+      <CheckBox Grid.Column="1" Content="Nur offene" IsChecked="{Binding OnlyOpen}"
+                VerticalAlignment="Center" Margin="0,0,12,0"/>
+      <Button Grid.Column="2" Content="＋ Vorgang" Command="{Binding AddVorgangCommand}"/>
+    </Grid>
+
+    <TextBlock Grid.Row="1" Text="{Binding Status}" FontSize="11" Opacity="0.6"/>
+
+    <ScrollViewer Grid.Row="2">
+      <StackPanel>
+        <ItemsControl ItemsSource="{Binding Cases}">
+          <ItemsControl.ItemTemplate>
+            <DataTemplate DataType="vm:VorgangItem">
+              <Border Background="{DynamicResource AppCardBackgroundBrush}"
+                      BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1"
+                      CornerRadius="8" Padding="12,10" Margin="0,0,0,8">
+                <StackPanel Spacing="8">
+                  <Grid ColumnDefinitions="*,Auto,Auto,Auto,Auto,Auto">
+                    <StackPanel Grid.Column="0">
+                      <StackPanel Orientation="Horizontal" Spacing="8">
+                        <Border Classes="statusPill" Classes.open="{Binding IsOpen}" Classes.closed="{Binding !IsOpen}">
+                          <TextBlock Text="{Binding StatusLabel}"/>
+                        </Border>
+                        <TextBlock Text="{Binding Model.Title}" FontWeight="SemiBold" FontSize="14"/>
+                      </StackPanel>
+                      <TextBlock Text="{Binding StudentNames}" FontSize="12" Opacity="0.7" Margin="0,2,0,0"/>
+                      <ItemsControl ItemsSource="{Binding TagChips}">
+                        <ItemsControl.ItemsPanel>
+                          <ItemsPanelTemplate><WrapPanel ItemSpacing="6" LineSpacing="4"/></ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                          <DataTemplate DataType="svm:TagChip">
+                            <Border Background="{Binding ColorHex}" CornerRadius="10" Padding="8,2" Margin="0,4,0,0">
+                              <TextBlock Text="{Binding Text}" FontSize="10" Foreground="White"/>
+                            </Border>
+                          </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                      </ItemsControl>
+                    </StackPanel>
+                    <StackPanel Grid.Column="1" Orientation="Horizontal">
+                      <Button Content="Details anzeigen" FontSize="11" Padding="8,3"
+                              Command="{Binding RevealCommand}" IsVisible="{Binding !IsRevealed}"/>
+                      <Button Content="Details ausblenden" FontSize="11" Padding="8,3"
+                              Command="{Binding RevealCommand}" IsVisible="{Binding IsRevealed}"/>
+                    </StackPanel>
+                    <Button Grid.Column="2" Content="Bearbeiten" FontSize="11" Padding="8,3"
+                            Command="{Binding $parent[ItemsControl].((vm:ClassTeacherCasesViewModel)DataContext).EditVorgangCommand}"
+                            CommandParameter="{Binding}"/>
+                    <StackPanel Grid.Column="3" Orientation="Horizontal">
+                      <Button Content="Schließen" FontSize="11" Padding="8,3" IsVisible="{Binding IsOpen}"
+                              Command="{Binding $parent[ItemsControl].((vm:ClassTeacherCasesViewModel)DataContext).ToggleStatusCommand}"
+                              CommandParameter="{Binding}"/>
+                      <Button Content="Wieder öffnen" FontSize="11" Padding="8,3" IsVisible="{Binding !IsOpen}"
+                              Command="{Binding $parent[ItemsControl].((vm:ClassTeacherCasesViewModel)DataContext).ToggleStatusCommand}"
+                              CommandParameter="{Binding}"/>
+                    </StackPanel>
+                    <Button Grid.Column="4" Content="Löschen" FontSize="11" Padding="8,3"
+                            Command="{Binding $parent[ItemsControl].((vm:ClassTeacherCasesViewModel)DataContext).DeleteVorgangCommand}"
+                            CommandParameter="{Binding}"/>
+                  </Grid>
+
+                  <StackPanel Spacing="10" IsVisible="{Binding IsRevealed}" Margin="0,4,0,0">
+                    <TextBlock Text="{Binding Model.Description}" FontSize="12" TextWrapping="Wrap" Opacity="0.85"
+                               IsVisible="{Binding Model.Description, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+
+                    <StackPanel Spacing="4">
+                      <TextBlock Text="Verknüpfte Dokumentation" FontSize="12" FontWeight="SemiBold" Opacity="0.7"/>
+                      <ItemsControl ItemsSource="{Binding LinkedDocumentation}">
+                        <ItemsControl.ItemTemplate>
+                          <DataTemplate DataType="svm:DocumentationItem">
+                            <Grid ColumnDefinitions="70,*,Auto,Auto" Margin="0,2">
+                              <TextBlock Grid.Column="0" Text="{Binding DateDisplay}" FontSize="11" Opacity="0.5"/>
+                              <StackPanel Grid.Column="1">
+                                <StackPanel Orientation="Horizontal" Spacing="6">
+                                  <TextBlock Text="{Binding StudentName}" FontSize="12" FontWeight="SemiBold"/>
+                                  <TextBlock Text="{Binding Model.Title}" FontSize="12" IsVisible="{Binding IsRevealed}"/>
+                                  <TextBlock Text="Vertraulich" FontSize="12" Opacity="0.6" IsVisible="{Binding !IsRevealed}"/>
+                                </StackPanel>
+                                <TextBlock Text="{Binding TypeLabel}" FontSize="10" Opacity="0.5"/>
+                              </StackPanel>
+                              <Button Grid.Column="2" Content="Anzeigen" FontSize="10" Padding="6,2" Margin="0,0,4,0"
+                                      Command="{Binding RevealCommand}" IsVisible="{Binding !IsRevealed}"/>
+                              <Button Grid.Column="3" Content="Entfernen" FontSize="10" Padding="6,2"
+                                      Command="{Binding $parent[ItemsControl].((vm:VorgangItem)DataContext).UnlinkCommand}"
+                                      CommandParameter="{Binding}"/>
+                            </Grid>
+                          </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                      </ItemsControl>
+                      <TextBlock Text="Noch keine Dokumentation verknüpft." FontSize="11" Opacity="0.5"
+                                 IsVisible="{Binding !HasLinkedDocumentation}"/>
+                      <Button Content="＋ Neue Dokumentation anlegen" FontSize="11" Padding="8,3"
+                              HorizontalAlignment="Left"
+                              Command="{Binding $parent[ItemsControl].((vm:ClassTeacherCasesViewModel)DataContext).CreateAndLinkDocumentationCommand}"
+                              CommandParameter="{Binding}"/>
+                    </StackPanel>
+
+                    <StackPanel Spacing="4" IsVisible="{Binding HasAvailableDocumentation}">
+                      <TextBlock Text="Bestehende Dokumentation der Schüler*innen verknüpfen" FontSize="12"
+                                 FontWeight="SemiBold" Opacity="0.7"/>
+                      <ItemsControl ItemsSource="{Binding AvailableDocumentation}">
+                        <ItemsControl.ItemTemplate>
+                          <DataTemplate DataType="svm:DocumentationItem">
+                            <Grid ColumnDefinitions="70,*,Auto,Auto" Margin="0,2">
+                              <TextBlock Grid.Column="0" Text="{Binding DateDisplay}" FontSize="11" Opacity="0.5"/>
+                              <StackPanel Grid.Column="1">
+                                <StackPanel Orientation="Horizontal" Spacing="6">
+                                  <TextBlock Text="{Binding StudentName}" FontSize="12" FontWeight="SemiBold"/>
+                                  <TextBlock Text="{Binding Model.Title}" FontSize="12" IsVisible="{Binding IsRevealed}"/>
+                                  <TextBlock Text="Vertraulich" FontSize="12" Opacity="0.6" IsVisible="{Binding !IsRevealed}"/>
+                                </StackPanel>
+                                <TextBlock Text="{Binding TypeLabel}" FontSize="10" Opacity="0.5"/>
+                              </StackPanel>
+                              <Button Grid.Column="2" Content="Anzeigen" FontSize="10" Padding="6,2" Margin="0,0,4,0"
+                                      Command="{Binding RevealCommand}" IsVisible="{Binding !IsRevealed}"/>
+                              <Button Grid.Column="3" Content="Verknüpfen" FontSize="10" Padding="6,2"
+                                      Command="{Binding $parent[ItemsControl].((vm:VorgangItem)DataContext).LinkCommand}"
+                                      CommandParameter="{Binding}"/>
+                            </Grid>
+                          </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                      </ItemsControl>
+                    </StackPanel>
+
+                    <StackPanel Spacing="4">
+                      <TextBlock Text="Angeheftete Klassenbucheinträge" FontSize="12" FontWeight="SemiBold" Opacity="0.7"/>
+                      <ItemsControl ItemsSource="{Binding ClassRegisterRows}">
+                        <ItemsControl.ItemTemplate>
+                          <DataTemplate DataType="vm:VorgangClassRegisterEntryRow">
+                            <Grid ColumnDefinitions="70,*,Auto" Margin="0,2">
+                              <TextBlock Grid.Column="0" Text="{Binding DateLabel}" FontSize="11" Opacity="0.5"/>
+                              <StackPanel Grid.Column="1">
+                                <TextBlock Text="{Binding StudentName}" FontSize="12" FontWeight="SemiBold"/>
+                                <TextBlock Text="{Binding SummaryLabel}" FontSize="11" Opacity="0.7" TextWrapping="Wrap"/>
+                              </StackPanel>
+                              <Button Grid.Column="2" Content="Entfernen" FontSize="10" Padding="6,2"
+                                      Command="{Binding $parent[ItemsControl].((vm:VorgangItem)DataContext).RemoveClassRegisterEntryCommand}"
+                                      CommandParameter="{Binding}"/>
+                            </Grid>
+                          </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                      </ItemsControl>
+                      <TextBlock Text="Noch keine Klassenbucheinträge angeheftet — im Klassenbuch-Tab über „→ Vorgang&#8220; möglich."
+                                 FontSize="11" Opacity="0.5" IsVisible="{Binding !HasClassRegisterRows}" TextWrapping="Wrap"/>
+                    </StackPanel>
+                  </StackPanel>
+                </StackPanel>
+              </Border>
+            </DataTemplate>
+          </ItemsControl.ItemTemplate>
+        </ItemsControl>
+        <TextBlock Text="Keine Vorgänge." Classes="emptyhint" IsVisible="{Binding !HasCases}"/>
+      </StackPanel>
+    </ScrollViewer>
+  </Grid>
+</UserControl>
@@ -0,0 +1,63 @@
+using Avalonia.Controls;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Desktop.ViewModels.ClassTeacher;
+using LehrerApp.Desktop.ViewModels.Students;
+using LehrerApp.Desktop.Views.Shared;
+using LehrerApp.Desktop.Views.Students;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace LehrerApp.Desktop.Views.ClassTeacher;
+
+public partial class ClassTeacherCasesView : UserControl
+{
+    public ClassTeacherCasesView() => InitializeComponent();
+
+    protected override void OnDataContextChanged(EventArgs e)
+    {
+        base.OnDataContextChanged(e);
+        if (DataContext is not ClassTeacherCasesViewModel vm) return;
+        vm.OnEditVorgang = ShowVorgangDialog;
+        vm.OnConfirmDeleteVorgang = ShowDeleteVorgangDialog;
+        vm.OnEditDocumentation = ShowDocumentationDialog;
+    }
+
+    private async Task<Vorgang?> ShowVorgangDialog(List<StudentOption> rosterStudents, Vorgang? editing)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return null;
+
+        var vm = new VorgangDialogViewModel(rosterStudents, editing);
+        var dialog = new VorgangDialog { DataContext = vm };
+        var saved = await dialog.ShowDialog<bool>(owner);
+        return saved ? vm.Result : null;
+    }
+
+    private async Task<bool> ShowDeleteVorgangDialog(VorgangItem item)
+    {
+        var info = new ConfirmDialogInfo
+        {
+            Title       = "Vorgang löschen?",
+            Message     = $"\"{item.Model.Title}\" wird als gelöscht markiert und nicht mehr angezeigt. " +
+                          "Verknüpfte Dokumentation bleibt erhalten.",
+            ConfirmText = "Löschen",
+        };
+        var dialog = new ConfirmDialog { DataContext = info };
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        return owner is not null && await dialog.ShowDialog<bool>(owner);
+    }
+
+    private async Task<Documentation?> ShowDocumentationDialog(
+        Guid defaultStudentId, List<StudentOption> studentOptions, Documentation? editing)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return null;
+
+        var vm = new DocumentationDialogViewModel(defaultStudentId, editing,
+            App.Services.GetRequiredService<IAttachmentStorage>(), studentOptions);
+        var dialog = new DocumentationDialog { DataContext = vm };
+        var saved = await dialog.ShowDialog<bool>(owner);
+        if (!saved) vm.DiscardUnsavedAttachments();
+        return saved ? vm.Result : null;
+    }
+}
@@ -507,6 +507,9 @@
      <ContentPage Header="Fehlzeiten">
        <views:ClassTeacherAbsencesView DataContext="{Binding DetailsTab}"/>
      </ContentPage>
+      <ContentPage Header="Vorgänge">
+        <views:ClassTeacherCasesView DataContext="{Binding CasesTab}"/>
+      </ContentPage>
    </TabbedPage>
  </Grid>
 </UserControl>
@@ -62,8 +62,8 @@
    <Grid Grid.Row="0" ColumnDefinitions="*,Auto">
      <StackPanel>
        <TextBlock Text="Klassenbuch" FontSize="22" FontWeight="SemiBold"/>
-        <TextBlock Text="Einträge anderer Lehrkräfte – nur zur Ansicht" FontSize="12" Opacity="0.55"
-                   IsVisible="{Binding !ShowOwnDocumentation}"/>
+        <TextBlock Text="Einträge anderer Lehrkräfte – nur zur Ansicht. Rechtsklick auf einen Eintrag heftet ihn an einen Vorgang an."
+                   FontSize="12" Opacity="0.55" IsVisible="{Binding !ShowOwnDocumentation}"/>
        <TextBlock Text="Eigene Dokumentation zu Schüler*innen dieser Klasse" FontSize="12" Opacity="0.55"
                   IsVisible="{Binding ShowOwnDocumentation}"/>
      </StackPanel>
@@ -147,7 +147,8 @@
    </Border>

    <Grid Grid.Row="4" IsVisible="{Binding !ShowOwnDocumentation}">
-      <DataGrid ItemsSource="{Binding Entries}" AutoGenerateColumns="False" IsReadOnly="True"
+      <DataGrid ItemsSource="{Binding Entries}" SelectedItem="{Binding SelectedEntry, Mode=TwoWay}"
+                AutoGenerateColumns="False" IsReadOnly="True"
                GridLinesVisibility="Horizontal" BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1"
                CanUserResizeColumns="True" CanUserSortColumns="True" RowHeight="46">
        <DataGrid.Columns>
@@ -159,6 +160,12 @@
          <DataGridTextColumn Header="Gruppe" Binding="{Binding CategoryGroup}" Width="0.8*"/>
          <DataGridTextColumn Header="Eintrag" Binding="{Binding Text}" Width="2*"/>
        </DataGrid.Columns>
+        <DataGrid.ContextMenu>
+          <ContextMenu>
+            <MenuItem Header="→ An Vorgang anheften" Command="{Binding PinToVorgangCommand}"
+                      CommandParameter="{Binding SelectedEntry}"/>
+          </ContextMenu>
+        </DataGrid.ContextMenu>
      </DataGrid>
      <StackPanel IsVisible="{Binding !HasEntries}" HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="5">
        <TextBlock Text="Keine Klassenbucheinträge im gewählten Zeitraum" FontWeight="SemiBold"/>
@@ -19,6 +19,21 @@ public partial class ClassTeacherRegisterView : UserControl
        if (DataContext is not ClassTeacherDetailsViewModel vm) return;
        vm.OnEditOwnDocumentation = ShowDocumentationDialog;
        vm.OnConfirmDeleteOwnDocumentation = ShowDeleteDocumentationDialog;
+        vm.OnPickVorgangForPin = ShowPinToVorgangDialog;
+    }
+
+    private async Task<PinToVorgangChoice?> ShowPinToVorgangDialog(ClassTeacherClassRegisterRow row)
+    {
+        if (DataContext is not ClassTeacherDetailsViewModel vm) return null;
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return null;
+
+        var summary = $"{row.DateLabel} · {row.StudentDisplayName} · {row.CategoryName}";
+        var matchingCases = vm.OpenCasesFor(row.StudentName);
+        var dialogVm = new PinToVorgangDialogViewModel(summary, matchingCases);
+        var dialog = new PinToVorgangDialog { DataContext = dialogVm };
+        var confirmed = await dialog.ShowDialog<bool>(owner);
+        return confirmed ? dialogVm.Result : null;
    }

    private async Task<Documentation?> ShowDocumentationDialog(
@@ -0,0 +1,44 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.ClassTeacher"
+        x:Class="LehrerApp.Desktop.Views.ClassTeacher.PinToVorgangDialog"
+        x:DataType="vm:PinToVorgangDialogViewModel"
+        Title="An Vorgang anheften"
+        Width="420" SizeToContent="Height" MinHeight="260"
+        CanResize="True" WindowStartupLocation="CenterOwner">
+
+  <Grid RowDefinitions="*,Auto" Margin="24">
+    <StackPanel Grid.Row="0" Spacing="12">
+      <TextBlock Text="An Vorgang anheften" Classes="dialogtitle"/>
+      <TextBlock Text="{Binding RowSummary}" FontSize="12" Opacity="0.6" TextWrapping="Wrap"/>
+
+      <StackPanel Spacing="4" IsVisible="{Binding HasMatchingOpenCases}">
+        <TextBlock Text="Bestehenden offenen Vorgang wählen" FontSize="12" Opacity="0.7"/>
+        <ComboBox ItemsSource="{Binding MatchingOpenCases}" SelectedItem="{Binding SelectedCase}"
+                  HorizontalAlignment="Stretch">
+          <ComboBox.ItemTemplate>
+            <DataTemplate x:DataType="vm:VorgangItem">
+              <TextBlock Text="{Binding Model.Title}"/>
+            </DataTemplate>
+          </ComboBox.ItemTemplate>
+        </ComboBox>
+      </StackPanel>
+
+      <TextBlock Text="— oder —" FontSize="11" Opacity="0.5" HorizontalAlignment="Center"
+                 IsVisible="{Binding HasMatchingOpenCases}"/>
+
+      <StackPanel Spacing="4">
+        <TextBlock Text="Neuen Vorgang anlegen mit Titel" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding NewTitle}" PlaceholderText="z.B. Schuleschwänzen"/>
+      </StackPanel>
+
+      <TextBlock Text="{Binding Error}" Foreground="Red" FontSize="11"
+                 IsVisible="{Binding Error, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+    </StackPanel>
+
+    <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,20,0,0">
+      <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
+      <Button Grid.Column="2" Content="Anheften" HorizontalAlignment="Stretch" Click="OnConfirm"/>
+    </Grid>
+  </Grid>
+</Window>
@@ -0,0 +1,21 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using LehrerApp.Desktop.ViewModels.ClassTeacher;
+
+namespace LehrerApp.Desktop.Views.ClassTeacher;
+
+public partial class PinToVorgangDialog : Window
+{
+    public PinToVorgangDialog() => InitializeComponent();
+
+    private void OnConfirm(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is PinToVorgangDialogViewModel vm)
+        {
+            vm.ConfirmCommand.Execute(null);
+            if (vm.Result is not null) Close(true);
+        }
+    }
+
+    private void OnCancel(object? sender, RoutedEventArgs e) => Close(false);
+}
@@ -0,0 +1,80 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.ClassTeacher"
+        x:Class="LehrerApp.Desktop.Views.ClassTeacher.VorgangDialog"
+        x:DataType="vm:VorgangDialogViewModel"
+        Title="{Binding DialogTitle}"
+        Width="480" SizeToContent="Height" MinHeight="360"
+        CanResize="True" WindowStartupLocation="CenterOwner">
+
+  <Grid RowDefinitions="*,Auto" Margin="24">
+    <ScrollViewer Grid.Row="0">
+      <StackPanel Spacing="12">
+        <TextBlock Text="{Binding DialogTitle}" Classes="dialogtitle"/>
+
+        <StackPanel Spacing="4">
+          <TextBlock Text="Titel *" FontSize="12" Opacity="0.7"/>
+          <TextBox Text="{Binding Title}"/>
+          <TextBlock Text="{Binding TitleError}" Foreground="Red" FontSize="11"
+                     IsVisible="{Binding TitleError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+        </StackPanel>
+
+        <StackPanel Spacing="4">
+          <TextBlock Text="Beschreibung" FontSize="12" Opacity="0.7"/>
+          <TextBox Text="{Binding Description}" AcceptsReturn="True" Height="90" TextWrapping="Wrap"
+                    PlaceholderText="Worum geht es? Was ist bisher passiert?"/>
+        </StackPanel>
+
+        <StackPanel Spacing="6">
+          <TextBlock Text="Schlagwörter" FontSize="12" Opacity="0.7"/>
+          <ItemsControl ItemsSource="{Binding Tags}">
+            <ItemsControl.ItemsPanel>
+              <ItemsPanelTemplate><WrapPanel ItemSpacing="6" LineSpacing="6"/></ItemsPanelTemplate>
+            </ItemsControl.ItemsPanel>
+            <ItemsControl.ItemTemplate>
+              <DataTemplate>
+                <Border Background="{DynamicResource SystemControlBackgroundBaseMediumBrush}"
+                        CornerRadius="10" Padding="8,3">
+                  <StackPanel Orientation="Horizontal" Spacing="5">
+                    <TextBlock Text="{Binding}" FontSize="11"/>
+                    <Button Content="×" FontSize="11" Padding="0" Background="Transparent"
+                            Command="{Binding $parent[ItemsControl].((vm:VorgangDialogViewModel)DataContext).RemoveTagCommand}"
+                            CommandParameter="{Binding}"/>
+                  </StackPanel>
+                </Border>
+              </DataTemplate>
+            </ItemsControl.ItemTemplate>
+          </ItemsControl>
+          <Grid ColumnDefinitions="*,8,Auto">
+            <AutoCompleteBox Grid.Column="0" Text="{Binding NewTag}"
+                              ItemsSource="{Binding TagSuggestions}"
+                              FilterMode="Contains" MinimumPrefixLength="0"
+                              PlaceholderText="Schlagwort (z.B. Absentismus)"/>
+            <Button Grid.Column="2" Content="＋" Command="{Binding AddTagCommand}"/>
+          </Grid>
+        </StackPanel>
+
+        <StackPanel Spacing="4">
+          <TextBlock Text="Betroffene Schüler*innen *" FontSize="12" Opacity="0.7"/>
+          <ItemsControl ItemsSource="{Binding StudentOptions}">
+            <ItemsControl.ItemsPanel>
+              <ItemsPanelTemplate><WrapPanel/></ItemsPanelTemplate>
+            </ItemsControl.ItemsPanel>
+            <ItemsControl.ItemTemplate>
+              <DataTemplate x:DataType="vm:VorgangStudentOption">
+                <CheckBox Content="{Binding Name}" IsChecked="{Binding IsSelected}" Margin="0,2,14,2"/>
+              </DataTemplate>
+            </ItemsControl.ItemTemplate>
+          </ItemsControl>
+          <TextBlock Text="{Binding StudentsError}" Foreground="Red" FontSize="11"
+                     IsVisible="{Binding StudentsError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+        </StackPanel>
+      </StackPanel>
+    </ScrollViewer>
+
+    <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,20,0,0">
+      <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
+      <Button Grid.Column="2" Content="Speichern" HorizontalAlignment="Stretch" Click="OnSave"/>
+    </Grid>
+  </Grid>
+</Window>
@@ -0,0 +1,21 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using LehrerApp.Desktop.ViewModels.ClassTeacher;
+
+namespace LehrerApp.Desktop.Views.ClassTeacher;
+
+public partial class VorgangDialog : Window
+{
+    public VorgangDialog() => InitializeComponent();
+
+    private void OnSave(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is VorgangDialogViewModel vm)
+        {
+            vm.SaveCommand.Execute(null);
+            if (vm.Result is not null) Close(true);
+        }
+    }
+
+    private void OnCancel(object? sender, RoutedEventArgs e) => Close(false);
+}