feat(ui): add progress support to ActionFillArea and FillArea_Click

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

OpenNest/Actions/ActionFillArea.cs

@@ -1,4 +1,8 @@
-using System.ComponentModel;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Threading;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 using OpenNest.Controls;
 
@@ -8,26 +12,60 @@ namespace OpenNest.Actions
     public class ActionFillArea : ActionSelectArea
     {
         private Drawing drawing;
+        private IProgress<NestProgress> progress;
+        private CancellationTokenSource cts;
+        private Action<List<Part>> onFillComplete;
 
         public ActionFillArea(PlateView plateView, Drawing drawing)
+            : this(plateView, drawing, null, null, null)
+        {
+        }
+
+        public ActionFillArea(PlateView plateView, Drawing drawing,
+            IProgress<NestProgress> progress, CancellationTokenSource cts,
+            Action<List<Part>> onFillComplete)
             : base(plateView)
         {
             plateView.PreviewKeyDown += plateView_PreviewKeyDown;
             this.drawing = drawing;
+            this.progress = progress;
+            this.cts = cts;
+            this.onFillComplete = onFillComplete;
         }
 
-        private void plateView_PreviewKeyDown(object sender, System.Windows.Forms.PreviewKeyDownEventArgs e)
+        private void plateView_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
         {
             if (e.KeyCode == Keys.Enter)
                 FillArea();
+            else if (e.KeyCode == Keys.Escape && cts != null)
+                cts.Cancel();
         }
 
-        private void FillArea()
+        private async void FillArea()
+        {
+            if (progress != null && cts != null)
+            {
+                try
+                {
+                    var engine = new NestEngine(plateView.Plate);
+                    var parts = await Task.Run(() =>
+                        engine.Fill(new NestItem { Drawing = drawing },
+                            SelectedArea, progress, cts.Token));
+
+                    onFillComplete?.Invoke(parts);
+                }
+                catch (Exception)
+                {
+                    onFillComplete?.Invoke(new List<Part>());
+                }
+            }
+            else
             {
                 var engine = new NestEngine(plateView.Plate);
                 engine.Fill(new NestItem { Drawing = drawing }, SelectedArea);
-
                 plateView.Invalidate();
+            }
+
             Update();
         }
 

OpenNest/Forms/MainForm.cs

@@ -938,7 +938,34 @@ namespace OpenNest.Forms
             if (drawing == null)
                 return;
 
-            activeForm.PlateView.SetAction(typeof(ActionFillArea), drawing);
+            nestingCts = new CancellationTokenSource();
+
+            var progressForm = new NestProgressForm(nestingCts, showPlateRow: false);
+
+            var progress = new Progress<NestProgress>(p =>
+            {
+                progressForm.UpdateProgress(p);
+                activeForm.PlateView.SetTemporaryParts(p.BestParts);
+            });
+
+            Action<List<Part>> onComplete = parts =>
+            {
+                if (parts != null && parts.Count > 0)
+                    activeForm.PlateView.AcceptTemporaryParts();
+                else
+                    activeForm.PlateView.ClearTemporaryParts();
+
+                progressForm.Close();
+                SetNestingLockout(false);
+                nestingCts.Dispose();
+                nestingCts = null;
+            };
+
+            progressForm.Show(this);
+            SetNestingLockout(true);
+
+            activeForm.PlateView.SetAction(typeof(ActionFillArea),
+                drawing, progress, nestingCts, onComplete);
         }
 
         private void AddPlate_Click(object sender, EventArgs e)