Update about Manager.

Manager/ImageDisplay.cs

@@ -0,0 +1,69 @@
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Manager
+{
+	public partial class ImageDisplay: UserControl
+	{
+		public ImageDisplay ()
+		{
+			InitializeComponent ();
+			IconSize = 16;
+			Ratio = (decimal)(8.0 / 7.0);
+		}
+		private Size iconSize = new Size (16, 16);
+		private decimal ratio = (decimal)(8.0 / 7.0);
+		private bool originImgSize = false;
+		public void RefreshPictureDisplay ()
+		{
+			if (originImgSize)
+			{
+				var backSizeWidth = (foregroundPicture.Image?.Size.Width ?? 0) * ratio;
+				var backSizeHeight = (foregroundPicture.Image?.Size.Width ?? 0) * ratio;
+				foregroundPicture.Size = ForegroundImage.Size;
+				backgroundPanel.Size = new Size ((int)backSizeWidth, (int)backSizeHeight);
+				sizeDisplay.Text = backgroundPanel.Size.ToString ();
+			}
+			else
+			{
+				foregroundPicture.Size = new Size (
+					(int)(iconSize.Width / ratio),
+					(int)(iconSize.Height / ratio)
+				);
+				backgroundPanel.Size = iconSize;
+			}
+			foregroundPicture.Left = (int)((backgroundPanel.Width - foregroundPicture.Width) * 0.5);
+			foregroundPicture.Top = (int)((backgroundPanel.Height - foregroundPicture.Height) * 0.5);
+			this.Size = new Size (
+				(int)(iconSize.Width * 1),
+				(int)((iconSize.Height + sizeDisplay.Height) * 1)
+			);
+		}
+		public decimal Ratio
+		{
+			get { return ratio; }
+			set
+			{
+				ratio = value;
+				RefreshPictureDisplay ();
+			}
+		}
+		public int IconSize
+		{
+			get { return iconSize.Width; }
+			set
+			{
+				sizeDisplay.Text = value.ToString ();
+				iconSize = new Size (value, value);
+				RefreshPictureDisplay ();
+			}
+		}
+		public bool IsOriginPicSize
+		{
+			get { return originImgSize; }
+			set { originImgSize = true; RefreshPictureDisplay (); }
+		}
+		public Color BackgroundColor { get { return backgroundPanel.BackColor; } set { backgroundPanel.BackColor = value; } }
+		public Image ForegroundImage { get { return foregroundPicture.Image; } set { foregroundPicture.Image = value; } }
+	}
+}