more work on gtk & code cleanup

Pilz.UI.Gtk/Dialogs/GtkDialogBase.Statics.cs

@@ -0,0 +1,33 @@
+using Gtk;
+
+namespace Pilz.UI.Gtk.Dialogs;
+
+public partial class GtkDialogBase
+{
+    private static GtkDialogBase CreateDialog<TContent>(TContent content, string title) where TContent : Widget
+    {
+        var dialog = new GtkDialogBase
+        {
+            Title = title,
+        };
+        dialog.ContentArea.Add(content);
+        content.Show();
+        return dialog;
+    }
+
+    public static TContent Show<TContent>(TContent content, string title) where TContent : Widget
+    {
+        var dialog = CreateDialog(content, title);
+        dialog.Show();
+        dialog.Destroy();
+        return content;
+    }
+
+    public static TContent ShowDialog<TContent>(TContent content, string title) where TContent : Widget
+    {
+        var dialog = CreateDialog(content, title);
+        dialog.Run();
+        dialog.Destroy();
+        return content;
+    }
+}