separate code into library

misc

AssetStudioGUI/Components/TreeViewExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace AssetStudioGUI
+{
+    internal static class TreeViewExtensions
+    {
+        private const int TVIF_STATE = 0x8;
+        private const int TVIS_STATEIMAGEMASK = 0xF000;
+        private const int TV_FIRST = 0x1100;
+        private const int TVM_SETITEM = TV_FIRST + 63;
+
+        [StructLayout(LayoutKind.Sequential, Pack = 8, CharSet = CharSet.Auto)]
+        private struct TVITEM
+        {
+            public int mask;
+            public IntPtr hItem;
+            public int state;
+            public int stateMask;
+            [MarshalAs(UnmanagedType.LPTStr)]
+            public string lpszText;
+            public int cchTextMax;
+            public int iImage;
+            public int iSelectedImage;
+            public int cChildren;
+            public IntPtr lParam;
+        }
+
+        [DllImport("user32.dll", CharSet = CharSet.Auto)]
+        private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TVITEM lParam);
+
+        /// <summary>
+        /// Hides the checkbox for the specified node on a TreeView control.
+        /// </summary>
+        public static void HideCheckBox(this TreeNode node)
+        {
+            var tvi = new TVITEM
+            {
+                hItem = node.Handle,
+                mask = TVIF_STATE,
+                stateMask = TVIS_STATEIMAGEMASK,
+                state = 0
+            };
+            SendMessage(node.TreeView.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
+        }
+    }
+}