CaptureItPlus/Capturemodes/FixedRegion.cs

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namespace CaptureItPlus.Capturemodes
{
    using System;
    using System.Drawing;
    using System.Windows.Forms;

    class FixedRegion : Panel
    {
        private const int HTBOTTOMRIGHT = 17;
        private const int WM_NCHITTEST = 0x84;
        private const int WM_SIZE = 0x05;
        private int _x;
        private int _y;
        public event EventHandler CaptureImage;

        public FixedRegion()
        {
            MouseDoubleClick += new MouseEventHandler(FixedRegion_MouseDoubleClick);
            MouseDown += new MouseEventHandler(FixedRegion_MouseDown);
            MouseMove += new MouseEventHandler(FixedRegion_MouseMove);
            MouseUp += new MouseEventHandler(FixedRegion_MouseUp);
            BackColor = Color.SkyBlue;
        }

        void FixedRegion_MouseUp(object sender, MouseEventArgs e)
        {
            Cursor = Cursors.Default;
        }

        void FixedRegion_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Left = (Left + e.X) - _x;
                Top = (Top + e.Y) - _y;
            }
        }

        void FixedRegion_MouseDown(object sender, MouseEventArgs e)
        {
            _x = e.X;
            _y = e.Y;
            Cursor = Cursors.Hand;
        }

        void FixedRegion_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (CaptureImage != null)
            {
                CaptureImage(this, e);
            }
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            ControlPaint.DrawBorder(e.Graphics, ClientRectangle, Color.Black, ButtonBorderStyle.Dashed);
            ControlPaint.DrawSizeGrip(e.Graphics, BackColor, Width - 16, Height - 16, 16, 16);
            var info = string.Format("Width : {0} Height : {1}", Width, Height);
            var size = Size.Round(e.Graphics.MeasureString(info, Font));
            ControlPaint.DrawStringDisabled(e.Graphics, info, Font, Color.Red, new Rectangle(new Point(4, 4), size), StringFormat.GenericDefault);
            base.OnPaint(e);