feat(ui): add NestProgressForm modeless dialog

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

OpenNest/Forms/NestProgressForm.cs

@@ -0,0 +1,184 @@
+using System;
+using System.Drawing;
+using System.Threading;
+using System.Windows.Forms;
+
+namespace OpenNest.Forms
+{
+    public class NestProgressForm : Form
+    {
+        private readonly CancellationTokenSource cts;
+
+        private Label phaseValue;
+        private Label plateValue;
+        private Label partsValue;
+        private Label densityValue;
+        private Label remnantValue;
+        private Label plateLabel;
+        private Button stopButton;
+        private TableLayoutPanel table;
+
+        public NestProgressForm(CancellationTokenSource cts, bool showPlateRow = true)
+        {
+            this.cts = cts;
+            InitializeLayout(showPlateRow);
+        }
+
+        private void InitializeLayout(bool showPlateRow)
+        {
+            Text = "Nesting Progress";
+            FormBorderStyle = FormBorderStyle.FixedToolWindow;
+            StartPosition = FormStartPosition.CenterParent;
+            ShowInTaskbar = false;
+            MinimizeBox = false;
+            MaximizeBox = false;
+            Size = new Size(280, showPlateRow ? 210 : 190);
+
+            table = new TableLayoutPanel
+            {
+                ColumnCount = 2,
+                Dock = DockStyle.Top,
+                AutoSize = true,
+                Padding = new Padding(8)
+            };
+
+            table.ColumnStyles.Add(new ColumnStyle(SizeType.Absolute, 80));
+            table.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
+
+            phaseValue = AddRow(table, "Phase:");
+            plateValue = AddRow(table, "Plate:");
+            partsValue = AddRow(table, "Parts:");
+            densityValue = AddRow(table, "Density:");
+            remnantValue = AddRow(table, "Remnant:");
+
+            if (!showPlateRow)
+            {
+                plateLabel = FindLabel(table, "Plate:");
+                if (plateLabel != null)
+                    SetRowVisible(plateLabel, plateValue, false);
+            }
+
+            stopButton = new Button
+            {
+                Text = "Stop",
+                Width = 80,
+                Anchor = AnchorStyles.None,
+                Margin = new Padding(0, 8, 0, 8)
+            };
+
+            stopButton.Click += StopButton_Click;
+
+            var buttonPanel = new FlowLayoutPanel
+            {
+                FlowDirection = FlowDirection.RightToLeft,
+                Dock = DockStyle.Top,
+                AutoSize = true,
+                Padding = new Padding(8, 0, 8, 0)
+            };
+
+            buttonPanel.Controls.Add(stopButton);
+
+            Controls.Add(buttonPanel);
+            Controls.Add(table);
+
+            // Reverse order since Dock.Top stacks bottom-up
+            Controls.SetChildIndex(table, 0);
+            Controls.SetChildIndex(buttonPanel, 1);
+        }
+
+        private Label AddRow(TableLayoutPanel table, string labelText)
+        {
+            var row = table.RowCount;
+            table.RowCount = row + 1;
+            table.RowStyles.Add(new RowStyle(SizeType.AutoSize));
+
+            var label = new Label
+            {
+                Text = labelText,
+                Font = new Font(Font, FontStyle.Bold),
+                AutoSize = true,
+                Margin = new Padding(4)
+            };
+
+            var value = new Label
+            {
+                Text = "\u2014",
+                AutoSize = true,
+                Margin = new Padding(4)
+            };
+
+            table.Controls.Add(label, 0, row);
+            table.Controls.Add(value, 1, row);
+
+            return value;
+        }
+
+        private Label FindLabel(TableLayoutPanel table, string text)
+        {
+            foreach (Control c in table.Controls)
+            {
+                if (c is Label l && l.Text == text)
+                    return l;
+            }
+
+            return null;
+        }
+
+        private void SetRowVisible(Label label, Label value, bool visible)
+        {
+            label.Visible = visible;
+            value.Visible = visible;
+        }
+
+        public void UpdateProgress(NestProgress progress)
+        {
+            if (IsDisposed || !IsHandleCreated)
+                return;
+
+            phaseValue.Text = FormatPhase(progress.Phase);
+            plateValue.Text = progress.PlateNumber.ToString();
+            partsValue.Text = progress.BestPartCount.ToString();
+            densityValue.Text = progress.BestDensity.ToString("P1");
+            remnantValue.Text = $"{progress.UsableRemnantArea:F1} sq in";
+        }
+
+        public void ShowCompleted()
+        {
+            if (IsDisposed || !IsHandleCreated)
+                return;
+
+            phaseValue.Text = "Done";
+            stopButton.Text = "Close";
+            stopButton.Enabled = true;
+            stopButton.Click -= StopButton_Click;
+            stopButton.Click += (s, e) => Close();
+        }
+
+        private void StopButton_Click(object sender, EventArgs e)
+        {
+            cts.Cancel();
+            stopButton.Text = "Stopping...";
+            stopButton.Enabled = false;
+        }
+
+        protected override void OnFormClosing(FormClosingEventArgs e)
+        {
+            if (!cts.IsCancellationRequested)
+                cts.Cancel();
+
+            base.OnFormClosing(e);
+        }
+
+        private static string FormatPhase(NestPhase phase)
+        {
+            switch (phase)
+            {
+                case NestPhase.Linear: return "Trying rotations...";
+                case NestPhase.RectBestFit: return "Trying best fit...";
+                case NestPhase.Pairs: return "Trying pairs...";
+                case NestPhase.Remainder: return "Filling remainder...";
+                default: return phase.ToString();
+            }
+        }
+    }
+}