feat: show selected part bounding box in status bar

Add SelectionChanged event to PlateView and display the selected part's
location and size in a new status bar label. Shows combined bounding box
when multiple parts are selected.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest/Actions/ActionSelect.cs

@@ -171,6 +171,7 @@ namespace OpenNest.Actions
                 part.IsSelected = true;
             }
 
+            plateView.NotifySelectionChanged();
             plateView.Invalidate();
             return true;
         }
@@ -187,6 +188,8 @@ namespace OpenNest.Actions
                 plateView.SelectedParts.Add(part);
                 part.IsSelected = true;
             }
+
+            plateView.NotifySelectionChanged();
         }
 
         private void UpdateBrushAndPen()

OpenNest/Controls/PlateView.cs

@@ -65,6 +65,7 @@ namespace OpenNest.Controls
         public event EventHandler<ItemAddedEventArgs<Part>> PartAdded;
         public event EventHandler<ItemRemovedEventArgs<Part>> PartRemoved;
         public event EventHandler StatusChanged;
+        public event EventHandler SelectionChanged;
 
         public PlateView()
             : this(ColorScheme.Default)
@@ -1017,12 +1018,19 @@ namespace OpenNest.Controls
         {
             SelectedParts.ForEach(p => p.IsSelected = false);
             SelectedParts.Clear();
+            SelectionChanged?.Invoke(this, EventArgs.Empty);
         }
 
         public void SelectAll()
         {
             parts.ForEach(p => p.IsSelected = true);
             SelectedParts.AddRange(parts);
+            SelectionChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        public void NotifySelectionChanged()
+        {
+            SelectionChanged?.Invoke(this, EventArgs.Empty);
         }
 
         public override void ZoomToPoint(Vector pt, float zoomFactor, bool redraw = true)

OpenNest/Forms/MainForm.Designer.cs

@@ -132,6 +132,7 @@
             plateSizeStatusLabel = new System.Windows.Forms.ToolStripStatusLabel();
             plateQtyStatusLabel = new System.Windows.Forms.ToolStripStatusLabel();
             gpuStatusLabel = new System.Windows.Forms.ToolStripStatusLabel();
+            selectionStatusLabel = new System.Windows.Forms.ToolStripStatusLabel();
             toolStrip1 = new System.Windows.Forms.ToolStrip();
             btnNew = new System.Windows.Forms.ToolStripButton();
             btnOpen = new System.Windows.Forms.ToolStripButton();
@@ -828,7 +829,7 @@
             // 
             // statusStrip1
             // 
-            statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { statusLabel1, locationStatusLabel, spacerLabel, plateIndexStatusLabel, plateSizeStatusLabel, plateQtyStatusLabel, gpuStatusLabel });
+            statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { statusLabel1, locationStatusLabel, selectionStatusLabel, spacerLabel, plateIndexStatusLabel, plateSizeStatusLabel, plateQtyStatusLabel, gpuStatusLabel });
             statusStrip1.Location = new System.Drawing.Point(0, 630);
             statusStrip1.Name = "statusStrip1";
             statusStrip1.Padding = new System.Windows.Forms.Padding(1, 0, 16, 0);
@@ -850,7 +851,14 @@
             locationStatusLabel.Size = new System.Drawing.Size(102, 19);
             locationStatusLabel.Text = "Location : [0, 0]";
             locationStatusLabel.Click += LocationStatusLabel_Click;
-            // 
+            //
+            // selectionStatusLabel
+            //
+            selectionStatusLabel.BorderSides = System.Windows.Forms.ToolStripStatusLabelBorderSides.Left;
+            selectionStatusLabel.Name = "selectionStatusLabel";
+            selectionStatusLabel.Padding = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            selectionStatusLabel.Size = new System.Drawing.Size(14, 19);
+            //
             // spacerLabel
             // 
             spacerLabel.Name = "spacerLabel";
@@ -1181,6 +1189,7 @@
         private System.Windows.Forms.ToolStripButton btnSaveAs;
         private System.Windows.Forms.ToolStripMenuItem centerPartsToolStripMenuItem;
         private System.Windows.Forms.ToolStripStatusLabel gpuStatusLabel;
+        private System.Windows.Forms.ToolStripStatusLabel selectionStatusLabel;
         private System.Windows.Forms.ToolStripSeparator toolStripSeparator4;
         private System.Windows.Forms.ToolStripLabel engineLabel;
         private System.Windows.Forms.ToolStripComboBox engineComboBox;

OpenNest/Forms/MainForm.cs

@@ -221,10 +221,38 @@ namespace OpenNest.Forms
                 activeForm.PlateView.Plate.Quantity);
         }
 
+        private void UpdateSelectionStatus()
+        {
+            if (activeForm == null || activeForm.PlateView.SelectedParts.Count == 0)
+            {
+                selectionStatusLabel.Text = string.Empty;
+                return;
+            }
+
+            var selected = activeForm.PlateView.SelectedParts;
+
+            if (selected.Count == 1)
+            {
+                var box = selected[0].BoundingBox;
+                selectionStatusLabel.Text = string.Format("Selected: [{0}, {1}] {2} x {3}",
+                    box.X.ToString("n4"), box.Y.ToString("n4"),
+                    box.Width.ToString("n4"), box.Length.ToString("n4"));
+            }
+            else
+            {
+                var bounds = selected.Select(p => p.BasePart).ToList().GetBoundingBox();
+                selectionStatusLabel.Text = string.Format("Selected ({0}): [{1}, {2}] {3} x {4}",
+                    selected.Count,
+                    bounds.X.ToString("n4"), bounds.Y.ToString("n4"),
+                    bounds.Width.ToString("n4"), bounds.Length.ToString("n4"));
+            }
+        }
+
         private void UpdateStatus()
         {
             UpdateLocationStatus();
             UpdatePlateStatus();
+            UpdateSelectionStatus();
         }
 
         private void UpdateGpuStatus()
@@ -313,6 +341,7 @@ namespace OpenNest.Forms
                 activeForm.PlateView.MouseMove -= PlateView_MouseMove;
                 activeForm.PlateView.MouseClick -= PlateView_MouseClick;
                 activeForm.PlateView.StatusChanged -= PlateView_StatusChanged;
+                activeForm.PlateView.SelectionChanged -= PlateView_SelectionChanged;
             }
 
             // If nesting is in progress and the active form changed, cancel nesting
@@ -330,11 +359,14 @@ namespace OpenNest.Forms
             if (activeForm == null)
             {
                 statusLabel1.Text = "";
+                selectionStatusLabel.Text = "";
                 return;
             }
 
             UpdateLocationMode();
+            UpdateSelectionStatus();
             activeForm.PlateView.StatusChanged += PlateView_StatusChanged;
+            activeForm.PlateView.SelectionChanged += PlateView_SelectionChanged;
             mnuViewDrawRapids.Checked = activeForm.PlateView.DrawRapid;
             mnuViewDrawBounds.Checked = activeForm.PlateView.DrawBounds;
             statusLabel1.Text = activeForm.PlateView.Status;
@@ -1199,6 +1231,11 @@ namespace OpenNest.Forms
             statusLabel1.Text = activeForm.PlateView.Status;
         }
 
+        private void PlateView_SelectionChanged(object sender, EventArgs e)
+        {
+            UpdateSelectionStatus();
+        }
+
         #endregion PlateView Events
 
         private void centerPartsToolStripMenuItem_Click(object sender, EventArgs e)