using?System;
using?System.Collections.Generic;
using?System.Drawing;
using?System.Drawing.Drawing2D;
using?System.Linq;
using?System.Text;
using?System.Windows.Forms;
using?System.ComponentModel;

namespace?WindowsFormsApplicationGDI
{
????[ToolboxItem（true）]
????public?class?MyTextbox:TextBox
????{
????????///?

????????///?圓角值
????????///?

????????[Browsable（true）]
????????public?int?Radius?{?get;?set;?}?=?5;

????????public?int?BorderWidth?{?get;?set;?}?=?2;

????????public?Color?BorderColorForMouseHover?{?get;?set;?}?=?SystemColors.ButtonHighlight;

????????protected?override?void?onresize（EventArgs?e）
????????{
????????????base.onresize（e）;
????????????this.Region=?Region?=?new?Region（GetRegionPath（））;
????????????
????????}
????????///?

????????///?獲取窗體有效區域路徑
????????///?

????????///?
????????private?GraphicsPath?GetRegionPath（）
????????{
????????????var?graphicsPath?=?new?GraphicsPath（）;

????????????graphicsPath.StartFigure（）;
????????????graphicsPath.AddArc（this.ClientRectangle.Left?this.ClientRectangle.Top?Radius?*?2?Radius?*?2?180?90）;
????????????graphicsPath.AddArc（this.ClientRectangle.Right?-?Radius?*?2?this.ClientRectangle.Top?Radius?*?2?Radius?*?2?270?90）;
????????????graphicsPath.AddArc（this.ClientRectangle.Right?-?Radius?*?2?this.ClientRectangle.Bottom?-?Radius?*?2?Radius?*?2?Radius?*?2?0?90）;
????????????graphicsPath.AddArc（this.ClientRectangle.Left?this.ClientRectangle.Bottom?-?Radius?*?2?Radius?*?2?Radius?*?2?90?90）;
????????????graphicsPath.CloseFigure（）;

????????????return?graphicsPath;
????????}
????????///?

????????///?獲取重繪邊框的路徑
????????///?

????????///?
????????private?GraphicsPath?GetBorderPath（）
????????{?????
????????????var?rec?=?new?Rectangle（ClientRectangle.X?+?1?ClientRectangle.Y?+?1?ClientRectangle.Width?-?2?ClientRectangle.Height?-?2）;

????????????var?graphicsPath?=?new?GraphicsPath（）;
????????????graphicsPath.StartFigure（）;
????????????graphicsPath.AddArc（rec.Left?rec.Top?Radius?*?2?Radius?*?2?180?90）;
????????????graphicsPath.AddArc（rec.