feat: add external drawing boxes and paged callbacks

LehrerApp.TemplateDesigner/DesignerViewModel.cs

@@ -44,7 +44,8 @@ public partial class DesignerViewModel : ObservableObject
 
     public IReadOnlyList<string> Units { get; } = ["mm", "cm", "pt", "in"];
     public IReadOnlyList<PlaceholderType> PlaceholderTypes { get; } = Enum.GetValues<PlaceholderType>();
-    public IReadOnlyList<string> ElementTypes { get; } = ["TEXT", "TEXTBOX", "FLOWBOX", "IMG", "TABLE", "CHART"];
+    public IReadOnlyList<string> ElementTypes { get; } =
+        ["TEXT", "TEXTBOX", "FLOWBOX", "DRAWBOX", "FLOWDRAWBOX", "IMG", "TABLE", "CHART"];
     public ObservableCollection<DesignerPlaceholder> Placeholders { get; } =
     [
         new("Datum", PlaceholderType.Date, true, DateTime.Today.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture)),
@@ -117,14 +118,16 @@ public partial class DesignerViewModel : ObservableObject
             issues.Add(new(ValidationSeverity.Error, $"Platzhalter „{used}“ ist nicht deklariert."));
         foreach (var path in layouts.SelectMany(x => x.Elements).Select(x => x switch { BackgroundElement b => b.Path, ImageElement i => i.Path, _ => null }).Where(x => x is not null))
             if (!Assets.ContainsKey(path!)) issues.Add(new(ValidationSeverity.Error, $"Asset „{path}“ fehlt."));
-        var firstFlows = layout.Elements.OfType<FlowBoxElement>().ToList();
+        var firstFlows = layout.Elements.Where(x => x is FlowBoxElement or FlowDrawBoxElement).ToList();
         if (firstFlows.Count > 1)
             issues.Add(new(ValidationSeverity.Error, "Ein Layout darf höchstens eine FLOWBOX enthalten."));
         if (continuationLayout is not null)
         {
-            var continuationFlows = continuationLayout.Elements.OfType<FlowBoxElement>().ToList();
+            var continuationFlows = continuationLayout.Elements.Where(x => x is FlowBoxElement or FlowDrawBoxElement).ToList();
             if (firstFlows.Count != 1 || continuationFlows.Count != 1)
-                issues.Add(new(ValidationSeverity.Error, "Haupt- und Folgeseite müssen jeweils genau eine FLOWBOX enthalten."));
+                issues.Add(new(ValidationSeverity.Error, "Haupt- und Folgeseite müssen jeweils genau ein fließendes Element enthalten."));
+            else if (firstFlows[0].GetType() != continuationFlows[0].GetType())
+                issues.Add(new(ValidationSeverity.Error, "Haupt- und Folgeseite müssen denselben fließenden Elementtyp verwenden."));
             else if (firstFlows[0].X != continuationFlows[0].X || firstFlows[0].Y != continuationFlows[0].Y
                 || firstFlows[0].Width != continuationFlows[0].Width || firstFlows[0].Height != continuationFlows[0].Height)
                 issues.Add(new(ValidationSeverity.Error, "Die FLOWBOX muss auf Haupt- und Folgeseiten dieselbe Position und Größe haben."));
@@ -269,6 +272,8 @@ public partial class DesignerViewModel : ObservableObject
             "TEXT" => $"TEXT {NewX} {NewY} {QuoteIfLiteral(NewContent)}{attrs}",
             "TEXTBOX" => $"TEXTBOX {NewX} {NewY} {NewWidth} {NewHeight} {QuoteIfLiteral(NewContent)}{attrs}",
             "FLOWBOX" => $"FLOWBOX {NewX} {NewY} {NewWidth} {NewHeight} {QuoteIfLiteral(NewContent)}{attrs}",
+            "DRAWBOX" => $"DRAWBOX {NewX} {NewY} {NewWidth} {NewHeight} {NewContent}{attrs}",
+            "FLOWDRAWBOX" => $"FLOWDRAWBOX {NewX} {NewY} {NewWidth} {NewHeight} {NewContent}{attrs}",
             "IMG" => $"IMG {NewContent} {NewX} {NewY} {NewWidth} {NewHeight} scale={NormalizedImageScale()}%",
             "TABLE" => $"TABLE {NewX} {NewY} {NewWidth} {NewHeight} {NewContent}{attrs}",
             "CHART" => $"CHART {NewX} {NewY} {NewWidth} {NewHeight} {NewContent}{attrs}",
@@ -353,6 +358,10 @@ public partial class DesignerViewModel : ObservableObject
                 + $"{Content(box.Content, box.Placeholder, box.Format)}{Attributes(box.Attributes)}",
             FlowBoxElement box => $"FLOWBOX {x} {y} {FormatNumber(width)} {FormatNumber(height)} "
                 + $"{Content(box.Content, box.Placeholder, box.Format)}{Attributes(box.Attributes)}",
+            DrawBoxElement box => $"DRAWBOX {x} {y} {FormatNumber(width)} {FormatNumber(height)} "
+                + $"${box.Placeholder}{Attributes(box.Attributes)}",
+            FlowDrawBoxElement box => $"FLOWDRAWBOX {x} {y} {FormatNumber(width)} {FormatNumber(height)} "
+                + $"${box.Placeholder}{Attributes(box.Attributes)}",
             TableElement table => $"TABLE {x} {y} {FormatNumber(width)} {FormatNumber(height)} "
                 + $"${table.Placeholder}{Attributes(table.Attributes)}",
             ChartElement chart => $"CHART {x} {y} {FormatNumber(width)} {FormatNumber(height)} "
@@ -525,11 +534,13 @@ public partial class DesignerPlaceholder : ObservableObject
         PlaceholderType.Image => new ImageValue([], "image/png"),
         PlaceholderType.Table => ParseTable(Sample),
         PlaceholderType.Chart => ParseChart(Sample),
+        PlaceholderType.Drawing => SampleDrawing(),
         _ => new TextValue(Sample),
     };
     public static string SampleFor(PlaceholderType type) => type switch
     { PlaceholderType.Date => DateTime.Today.ToString("yyyy-MM-dd"), PlaceholderType.Number => "42,5",
-      PlaceholderType.Table => "Datum;Grund|01.09.;Krank", PlaceholderType.Chart => "Sep:2;Okt:3;Nov:1", _ => "Beispielwert" };
+      PlaceholderType.Table => "Datum;Grund|01.09.;Krank", PlaceholderType.Chart => "Sep:2;Okt:3;Nov:1",
+      PlaceholderType.Drawing => "Externe Zeichenbefehle", _ => "Beispielwert" };
     private static TableValue ParseTable(string value)
     {
         var lines = value.Split('|', StringSplitOptions.RemoveEmptyEntries);
@@ -538,6 +549,10 @@ public partial class DesignerPlaceholder : ObservableObject
     }
     private static ChartValue ParseChart(string value) => new([new("Werte", value.Split(';', StringSplitOptions.RemoveEmptyEntries)
         .Select((x, i) => { var parts = x.Split(':', 2); return new ChartPoint(parts[0], parts.Length == 2 && decimal.TryParse(parts[1], CultureInfo.InvariantCulture, out var y) ? y : i + 1); }).ToList())]);
+    private static DrawingValue SampleDrawing() => new DrawingValue(
+        [new DrawRectangle(0, 0, 80, 24, "#2563EB", 0.8f, "#EFF6FF"),
+         new DrawString(4, 4, "Dynamischer Inhalt", 10, "#1E3A8A", Bold: true),
+         new MoveTo(4, 19), new LineTo(76, 19, "#93C5FD", 0.6f)], 24);
 }
 
 internal sealed class DesignerDataProvider(IReadOnlyDictionary<string, PlaceholderValue> values) : ITemplateDataProvider