VenomRat

Helper/HexEditor/Caret.cs

@@ -0,0 +1,184 @@
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+namespace Server.Helper.HexEditor;
+
+public class Caret
+{
+	private int _startIndex;
+
+	private int _endIndex;
+
+	private bool _isCaretActive;
+
+	private bool _isCaretHidden;
+
+	private Point _location;
+
+	private HexEditor _editor;
+
+	public int SelectionStart
+	{
+		get
+		{
+			if (_endIndex < _startIndex)
+			{
+				return _endIndex;
+			}
+			return _startIndex;
+		}
+	}
+
+	public int SelectionLength
+	{
+		get
+		{
+			if (_endIndex < _startIndex)
+			{
+				return _startIndex - _endIndex;
+			}
+			return _endIndex - _startIndex;
+		}
+	}
+
+	public bool Focused => _isCaretActive;
+
+	public int CurrentIndex => _endIndex;
+
+	public Point Location => _location;
+
+	public event EventHandler SelectionStartChanged;
+
+	public event EventHandler SelectionLengthChanged;
+
+	public Caret(HexEditor editor)
+	{
+		_editor = editor;
+		_isCaretActive = false;
+		_startIndex = 0;
+		_endIndex = 0;
+		_isCaretHidden = true;
+		_location = new Point(0, 0);
+	}
+
+	private bool Create(IntPtr hWHandler)
+	{
+		if (!_isCaretActive)
+		{
+			_isCaretActive = true;
+			return CreateCaret(hWHandler, IntPtr.Zero, 0, (int)_editor.CharSize.Height - 2);
+		}
+		return false;
+	}
+
+	private bool Show(IntPtr hWnd)
+	{
+		if (_isCaretActive)
+		{
+			_isCaretHidden = false;
+			return ShowCaret(hWnd);
+		}
+		return false;
+	}
+
+	public bool Hide(IntPtr hWnd)
+	{
+		if (_isCaretActive && !_isCaretHidden)
+		{
+			_isCaretHidden = true;
+			return HideCaret(hWnd);
+		}
+		return false;
+	}
+
+	public bool Destroy()
+	{
+		if (_isCaretActive)
+		{
+			_isCaretActive = false;
+			DeSelect();
+			DestroyCaret();
+		}
+		return false;
+	}
+
+	public void SetStartIndex(int index)
+	{
+		_startIndex = index;
+		_endIndex = _startIndex;
+		if (this.SelectionStartChanged != null)
+		{
+			this.SelectionStartChanged(this, EventArgs.Empty);
+		}
+		if (this.SelectionLengthChanged != null)
+		{
+			this.SelectionLengthChanged(this, EventArgs.Empty);
+		}
+	}
+
+	public void SetEndIndex(int index)
+	{
+		_endIndex = index;
+		if (this.SelectionStartChanged != null)
+		{
+			this.SelectionStartChanged(this, EventArgs.Empty);
+		}
+		if (this.SelectionLengthChanged != null)
+		{
+			this.SelectionLengthChanged(this, EventArgs.Empty);
+		}
+	}
+
+	public void SetCaretLocation(Point start)
+	{
+		Create(_editor.Handle);
+		_location = start;
+		SetCaretPos(_location.X, _location.Y);
+		Show(_editor.Handle);
+	}
+
+	public bool IsSelected(int byteIndex)
+	{
+		if (SelectionStart <= byteIndex)
+		{
+			return byteIndex < SelectionStart + SelectionLength;
+		}
+		return false;
+	}
+
+	private void DeSelect()
+	{
+		if (_endIndex < _startIndex)
+		{
+			_startIndex = _endIndex;
+		}
+		else
+		{
+			_endIndex = _startIndex;
+		}
+		if (this.SelectionStartChanged != null)
+		{
+			this.SelectionStartChanged(this, EventArgs.Empty);
+		}
+		if (this.SelectionLengthChanged != null)
+		{
+			this.SelectionLengthChanged(this, EventArgs.Empty);
+		}
+	}
+
+	[DllImport("user32.dll", SetLastError = true)]
+	private static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight);
+
+	[DllImport("user32.dll", SetLastError = true)]
+	private static extern bool DestroyCaret();
+
+	[DllImport("user32.dll", SetLastError = true)]
+	private static extern bool SetCaretPos(int x, int y);
+
+	[DllImport("user32.dll", SetLastError = true)]
+	private static extern bool ShowCaret(IntPtr hWnd);
+
+	[DllImport("user32.dll", SetLastError = true)]
+	private static extern bool HideCaret(IntPtr hWnd);
+}