more work on gtk & code cleanup

Pilz.UI.Gtk/Dialogs/GtkContent.cs

@@ -0,0 +1,34 @@
+using Gtk;
+
+namespace Pilz.UI.Gtk.Dialogs;
+
+public class GtkContent : Box
+{
+    public GtkDialogBase Dialog { get; internal set; } = null!;
+    public ResponseType Result { get; set; } = ResponseType.Cancel;
+
+    public bool RegisterDialogAccept { get; set; } = true;
+    public bool RegisterDialogCancel { get; set; } = true;
+
+    protected void Close(ResponseType result)
+    {
+        Result = result;
+        Dialog.Destroy();
+    }
+
+    protected virtual bool ValidateOK()
+    {
+        return true;
+    }
+
+    protected virtual void Button_Confirm_Clicked(object? sender, EventArgs e)
+    {
+        if (ValidateOK())
+            Close(ResponseType.Ok);
+    }
+
+    protected virtual void Button_Cancel_Clicked(object? sender, EventArgs e)
+    {
+        Close(ResponseType.Cancel);
+    }
+}