无标题窗口移动及缩放

自定义窗口控件实现拖拽与缩放功能

最新推荐文章于 2024-09-01 14:54:08 发布

转载最新推荐文章于 2024-09-01 14:54:08 发布 · 440 阅读

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public partial class FrmResizeDrapTemplate : Form
    {
        public FrmResizeDrapTemplate()
        {
            InitializeComponent();
        }

        private const int WM_NCHITTEST = 0x84;
        private const int HTCLIENT = 0x1;
        private const int HTCAPTION = 0x2;

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            #region Move without Form Border
            if (m.Msg == WM_NCHITTEST)
            {
                this.DefWndProc(ref m);
                if (m.Result.ToInt32() == HTCLIENT)
                    m.Result = new IntPtr(HTCAPTION);
            }
            #endregion
            #region Resize without Form Border
            if (m.Msg == WM_NCHITTEST && this.FormBorderStyle == FormBorderStyle.None)
            {
                Point z = Control.MousePosition;
                if (z != null)
                {
                    Point tmp = this.PointToScreen(new Point());
                    z.X -= tmp.X;
                    z.Y -= tmp.Y;
                }
                Padding resizePadding = new Padding(3);
                int result = 0;
                if (z.X < (resizePadding.Left)) result = 10;
                else if (z.X > (Width - resizePadding.Right)) result = 11;
                if (z.Y < (resizePadding.Top))
                {
                    switch (result)
                    {
                        case 0:
                            result = 12;
                            break;
                        case 10:
                            result = 13;
                            break;
                        case 11:
                            result = 14;
                            break;
                        default:
                            break;
                    }
                }
                else if (z.Y < (20))
                {
                    switch (result)
                    {
                        case 0:
                            result = 2;
                            break;
                        default:
                            break;
                    }
                }
                else if (z.Y > (Height - resizePadding.Bottom))
                {
                    switch (result)
                    {
                        case 0:
                            result = 15;
                            break;
                        case 10:
                            result = 16;
                            break;
                        case 11:
                            result = 17;
                            break;
                        default:
                            break;
                    }
                }

                if (result != 0) m.Result = (IntPtr)result;
            }
            #endregion
        }
    }