sliding window for vision builder image strip pannel

Hawkeye.VisionBuilder/Features/ImagesStrip/Components/ImageThumbnailControl.cs

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+using System;
+using System.Drawing;
+using System.IO;
+using System.Windows.Forms;
+using OpenCvSharp;
+using OpenCvSharp.Extensions;
+
+namespace Hawkeye.VisionBuilder.Features.ImagesStrip.Components
+{
+    /// <summary>
+    /// Represents a single image thumbnail item with an image and filename label.
+    /// </summary>
+    public class ImageThumbnailControl : Panel
+    {
+        private const int ThumbnailSize = 108;
+        private const int BorderWidth = 3;
+
+        private readonly PictureBox _pictureBox;
+        private readonly Label _label;
+        private bool _isSelected;
+        private string _imagePath;
+
+        public string ImagePath
+        {
+            get => _imagePath;
+            set
+            {
+                _imagePath = value;
+                LoadImage(value);
+                _label.Text = Path.GetFileNameWithoutExtension(value);
+            }
+        }
+
+        public bool IsSelected
+        {
+            get => _isSelected;
+            set
+            {
+                if (_isSelected != value)
+                {
+                    _isSelected = value;
+                    Invalidate(); // Trigger repaint to show/hide border
+                }
+            }
+        }
+
+        public event EventHandler ThumbnailClicked;
+
+        public ImageThumbnailControl()
+        {
+            // Set up the container panel
+            Width = ThumbnailSize + (BorderWidth * 2);
+            Height = ThumbnailSize + 25 + (BorderWidth * 2); // Extra space for label
+            Margin = new Padding(5);
+            Cursor = Cursors.Hand;
+
+            // Create PictureBox for the image
+            _pictureBox = new PictureBox
+            {
+                Width = ThumbnailSize,
+                Height = ThumbnailSize,
+                SizeMode = PictureBoxSizeMode.StretchImage,
+                Location = new System.Drawing.Point(BorderWidth, BorderWidth),
+                BackColor = Color.Black
+            };
+            _pictureBox.Click += OnThumbnailClick;
+
+            // Create Label for the filename
+            _label = new Label
+            {
+                Width = ThumbnailSize,
+                Height = 20,
+                Location = new System.Drawing.Point(BorderWidth, ThumbnailSize + BorderWidth + 2),
+                TextAlign = ContentAlignment.MiddleCenter,
+                AutoEllipsis = true,
+                Font = new Font("Segoe UI", 8f)
+            };
+            _label.Click += OnThumbnailClick;
+
+            Controls.Add(_pictureBox);
+            Controls.Add(_label);
+
+            // Enable double buffering to reduce flicker
+            DoubleBuffered = true;
+        }
+
+        private void LoadImage(string imagePath)
+        {
+            try
+            {
+                if (File.Exists(imagePath))
+                {
+                    using (var mat = new Mat(imagePath))
+                    {
+                        var resized = mat.Resize(new OpenCvSharp.Size(ThumbnailSize, ThumbnailSize));
+                        var bitmap = resized.ToBitmap();
+
+                        // Dispose old image if exists
+                        var oldImage = _pictureBox.Image;
+                        _pictureBox.Image = bitmap;
+                        oldImage?.Dispose();
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                // If image loading fails, show error in label
+                _label.Text = "Error loading image";
+                _label.ForeColor = Color.Red;
+            }
+        }
+
+        private void OnThumbnailClick(object sender, EventArgs e)
+        {
+            ThumbnailClicked?.Invoke(this, EventArgs.Empty);
+        }
+
+        protected override void OnPaint(PaintEventArgs e)
+        {
+            base.OnPaint(e);
+
+            // Draw selection border if selected
+            if (_isSelected)
+            {
+                using (var pen = new Pen(Color.DodgerBlue, BorderWidth))
+                {
+                    var rect = new Rectangle(
+                        BorderWidth / 2,
+                        BorderWidth / 2,
+                        Width - BorderWidth,
+                        Height - BorderWidth
+                    );
+                    e.Graphics.DrawRectangle(pen, rect);
+                }
+            }
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                // Dispose the image to free memory
+                _pictureBox?.Image?.Dispose();
+                _pictureBox?.Dispose();
+                _label?.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+    }
+}