Window Highlighter

using System;
using System.Diagnostics;
using System.Drawing;
using System.Windows.Forms;

namespace System
{
    /// <summary>
    /// Highlights the specified window just like Spy++
    /// </summary>
    /// <param name="hWnd"></param>
    ///
    public static class WindowHighlighter
    {
        private static float m_DefaultPenWidth = 3;
        private static Color m_DefaultBoarderColor = Color.Red;

        public static float DefaultPenWidth
        {
            get { return WindowHighlighter.m_DefaultPenWidth; }
            set { WindowHighlighter.m_DefaultPenWidth = value; }
        }
        public static Color DefaultBoarderColor
        {
            get { return WindowHighlighter.m_DefaultBoarderColor; }
            set { WindowHighlighter.m_DefaultBoarderColor = value; }
        }
        public static void Highlight()
        {
            if (Form.ActiveForm == null)
                return;
            Control cnt = Form.ActiveForm.ActiveControl;
            if (cnt == null)
                return;
            ValidateControlHandle(cnt);
            Highlight(cnt.Handle,DefaultBoarderColor,DefaultPenWidth);
        }
        public static void Highlight(Control cnt)
        {
            Highlight(cnt.Handle,DefaultBoarderColor,DefaultPenWidth);
        }
        public static void Highlight(Control cnt, Color boarderColor)
        {
            Highlight(cnt, boarderColor, DefaultPenWidth);
        }
        public static void Highlight(Control cnt, Color boarderColor, float penWidth)
        {
            ValidateControlHandle(cnt);
            Highlight(cnt.Handle, boarderColor, penWidth);
        }
        private static void ValidateControlHandle(Control cnt)
        {
            if (!cnt.IsHandleCreated)
                throw new Exception("Handle not created yet");
        }
        public static void Highlight(IntPtr hWnd)
        {
            Highlight(hWnd, DefaultBoarderColor,DefaultPenWidth);
        }
        public static void Highlight(IntPtr hWnd, Color boarderColor)
        {
            Highlight(hWnd, boarderColor, DefaultPenWidth);
        }

        public static void Highlight(IntPtr hWnd, Color boarderColor, float penWidth)
        {
            Win32.Rect rc = new Win32.Rect();
            Win32.GetWindowRect(hWnd, ref rc);

            IntPtr hDC = Win32.GetWindowDC(hWnd);
            if (hDC != IntPtr.Zero)
            {
                using (Pen pen = new Pen(boarderColor, penWidth))
                {
                    using (Graphics g = Graphics.FromHdc(hDC))
                    {
                        g.DrawRectangle(pen, 0, 0, rc.right - rc.left - (int)penWidth, rc.bottom - rc.top - (int)penWidth);
                    }
                }
            }
            Win32.ReleaseDC(hWnd, hDC);
        }

        /// <summary>
        /// Forces a window to refresh, to eliminate our funky highlighted border
        /// </summary>
        /// <param name="hWnd"></param>
        ///
        public static void Refresh(Control cnt)
        {
            ValidateControlHandle(cnt);
            Refresh(cnt.Handle);
        }
        public static void Refresh(IntPtr hWnd)
        {
            Win32.InvalidateRect(hWnd, IntPtr.Zero, 1 /* TRUE */);
            Win32.UpdateWindow(hWnd);
            Win32.RedrawWindow(hWnd, IntPtr.Zero, IntPtr.Zero, Win32.RDW_FRAME | Win32.RDW_INVALIDATE | Win32.RDW_UPDATENOW | Win32.RDW_ALLCHILDREN);
        }
    }
}