Full-size cover picture viewer

Source/LibationWinForms/grid/ImageDisplay.cs

@@ -0,0 +1,118 @@
+using FileLiberator;
+using LibationFileManager;
+using System;
+using System.Drawing;
+using System.IO;
+using System.Windows.Forms;
+
+namespace LibationWinForms
+{
+	public partial class ImageDisplay : Form
+	{
+		public string PictureFileName { get; set; }
+		public string BookSaveDirectory { get; set; }
+		public byte[] CoverPicture { get => _coverBytes; set => pictureBox1.Image = Dinah.Core.Drawing.ImageReader.ToImage(_coverBytes = value); }
+
+
+
+		private byte[] _coverBytes;
+
+		private bool detectedResizeDirection = false;
+		private bool resizingWidth = false;
+		private bool resizingHeight = false;
+
+		private int lastWidth;
+		private int lastHeight;
+		private int formExtraWidth;
+		private int formExtraHeight;
+
+		private double pictureAR = 1;
+
+		public ImageDisplay()
+		{
+			InitializeComponent();
+			lastWidth = Width;
+			lastHeight = Height;
+		}
+
+		protected override void OnResizeBegin(EventArgs e)
+		{
+			detectedResizeDirection = false;
+			base.OnResizeBegin(e);
+		}
+
+		protected override void OnResizeEnd(EventArgs e)
+		{
+			base.OnResize(e);
+			base.OnResizeEnd(e);
+		}
+
+		protected override void OnResize(EventArgs e)
+		{
+			if (WindowState != FormWindowState.Normal)
+			{
+				base.OnResize(e);
+				return;
+			}
+
+			int width = this.Width, height = this.Height;
+
+			if (!detectedResizeDirection)
+			{
+				resizingWidth = lastWidth != width;
+				resizingHeight = lastHeight != height;
+				detectedResizeDirection = true;
+			}
+
+			if (resizingWidth && !resizingHeight)
+				height = CalculateARHeight(width);
+			else
+				width = CalculateARWidth(height);
+
+			pictureBox1.Size = new Size(width - formExtraWidth, height - formExtraHeight);
+
+			lastWidth = width;
+			lastHeight = height;
+
+			SetBoundsCore(Location.X, Location.Y, width, height, BoundsSpecified.Width | BoundsSpecified.Height);
+		}
+
+		private int CalculateARHeight(int width)
+		{
+			return (int)((width - formExtraWidth) * pictureAR) + formExtraHeight;
+		}
+
+		private int CalculateARWidth(int height)
+		{
+			return (int)((height - formExtraHeight) * pictureAR) + formExtraWidth;
+		}
+
+		private void ImageDisplay_Shown(object sender, EventArgs e)
+		{
+			formExtraWidth = Width - pictureBox1.Width;
+			formExtraHeight = Height - pictureBox1.Height;
+			OnResize(e);
+		}
+
+		private void savePictureToolStripMenuItem_Click(object sender, EventArgs e)
+		{
+			SaveFileDialog saveFileDialog = new();
+			saveFileDialog.Filter = "jpeg|*.jpg";
+			saveFileDialog.InitialDirectory = Directory.Exists(BookSaveDirectory) ? BookSaveDirectory : Path.GetDirectoryName(BookSaveDirectory);
+			saveFileDialog.FileName = PictureFileName;
+
+			if (saveFileDialog.ShowDialog() != DialogResult.OK)
+				return;
+
+			try
+			{
+				File.WriteAllBytes(saveFileDialog.FileName, CoverPicture);
+			}
+			catch (Exception ex)
+			{
+				Serilog.Log.Logger.Error(ex.Message);
+				MessageBox.Show(this, $"An error was encountered while trying to save the picture\r\n\r\n{ex.Message}", "Sailed to save picture", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
+			}
+		}
+	}
+}