canvasManagement/Management.Web/Shared/Components/AssignmentForm/AssignmentMarkdownEditor.razor

@using Markdig

@inject CoursePlanner planner
@inject AssignmentEditorContext assignmentContext

@code
{
  protected override void OnInitialized()
  {
    assignmentContext.StateHasChanged += reload;
    reload();
  }
  private void reload()
  {
    if (assignmentContext.Assignment != null)
    {
      if(rawText == string.Empty)
      {
        rawText = assignmentContext.Assignment.ToMarkdown();
        this.InvokeAsync(this.StateHasChanged);
      }
    }
  }
  public void Dispose()
  {
    assignmentContext.StateHasChanged -= reload;
  }

  private string rawText { get; set; } = string.Empty;
  private string? error = null;
  public bool? UseTemplate { get; set; } = null;

  public string? TemplateId { get; set; }

  public Dictionary<string, string> VariableValues { get; set; } = new Dictionary<string, string>();

  private AssignmentTemplate? selectedTemplate =>
    planner
    .LocalCourse?
    .Settings
    .AssignmentTemplates
    .FirstOrDefault(t => t.Id == TemplateId);

  private void handleChange(string newRawAssignment)
  {
    rawText = newRawAssignment;
    if (newRawAssignment != string.Empty)
    {
      try 
      {
        var parsed = LocalAssignment.ParseMarkdown(newRawAssignment);
        error = null;
        assignmentContext.SaveAssignment(parsed);
      }
      catch(AssignmentMarkdownParseException e)
      {
        error = e.Message;
      }
      catch(RubricMarkdownParseException e)
      {
        error = e.Message;
      }
      finally
      {
        StateHasChanged();
      }

      @* if (assignmentContext.Assignment != null)
      {
        var newAssignment = assignmentContext.Assignment with
        {
          Description = newRawAssignment
        };
        assignmentContext.SaveAssignment(newAssignment);
      } *@
    }
    StateHasChanged();
  }

  private MarkupString preview { get => (MarkupString)Markdown.ToHtml(assignmentContext.Assignment.Description); }

}

@if(assignmentContext.Assignment != null && planner.LocalCourse != null)
{
  <div class="row h-100">
    <div class="col-6">
      @* <textarea 
        id="description" 
        class="form-control h-100" 
        rows=12
        @bind="description"
        @oninput="handleNewDescription"
      /> *@

      <MonacoTextArea Value="@rawText" OnChange="@handleChange" />
    </div>
    <div class="col-6">
      @if (error != null)
      {
        <p class="text-danger text-truncate">Error: @error</p>
      }

      
      <div>Due At: @assignmentContext.Assignment.DueAt</div>
      <div>Lock At: @assignmentContext.Assignment.LockAt</div>
      <div>Assignment Group Name @assignmentContext.Assignment.LocalAssignmentGroupName</div>
      <div>Submission Types</div>
      <ul>
        @foreach(var t in assignmentContext.Assignment.SubmissionTypes)
        {
          <li>@t</li>
        }
      </ul>
      <hr>
      <div>
        @(preview)
      </div>
      <hr>
        <RubricDisplay />
    </div>
  </div>
}