本文介绍了文本框自定义的OnPaint的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 29岁程序员,3月因学历无情被辞! 我想创建一个自定义的OnPaint对我的文本框,它是工作...的这是工作但是,当我尝试输入一些东西,一个。文本框被渲染文本上述 这是我的构造函数: 公开文本框() {字体=新System.Drawing.Font(濑越UI,11F,System.Drawing.FontStyle.Regular,System.Drawing.GraphicsUnit.Point, ((字节)(0))); =背景色Color.White; BORDERCOLOR = Color.Gray; =边框样式System.Windows.Forms.BorderStyle.None; 的SetStyle(ControlStyles.UserPaint,真); } 而OnPaint中: 保护覆盖无效的OnPaint(System.Windows.Forms.PaintEventArgs E) {图形G = e.Graphics; g.FillRectangle(backgroundBrush,0,0,this.Width,this.Height); 的SizeF fontSize的= g.MeasureString(文字,字体); g.DrawString(文本,字体,新SolidBrush(前景色),新的PointF(5,5),cFormat); g.DrawRectangle(borderPen,borderPen.Width / 2,borderPen.Width / 2,this.Width - borderPen.Width,this.Height - borderPen.Width); } 解决方案 如果你只是想自定义文本框有一些自定义的边框(宽度和颜色),我有2个解决方案,在这里: 使用 ControlPaint ,这将允许你画边框与一些样式和颜色,但不能使用刷来吸引更多不同地(如 HatchBrush 可以做): 公共类CustomTextBox:文本框 {函数[DllImport(USER32)] 私人静态外部的IntPtr GetWindowDC(IntPtr的HWND); 结构RECT {公众诠释左,上,右,下; } 结构NCCALSIZE_PARAMS {公共RECT newWindow; 公共RECT oldWindow; 公共RECT clientWindow; IntPtr的WINDOWPOS; } 浮动clientPadding = 2; 浮动actualBorderWidth = 4; 颜色BORDERCOLOR = Color.Red; 保护覆盖无效的WndProc(参考消息M) { //我们必须改变clientsize腾出空间边界 //如果没有,边框如何限制厚是。如果(m.Msg == 0X83)//如果WM_NCCALCSIZE {(m.WParam == IntPtr.Zero) { RECT RECT =(RECT )Marshal.PtrToStructure(m.LParam的typeof(RECT)); rect.left + = clientPadding; rect.right - = clientPadding; rect.top + = clientPadding; rect.bottom - = clientPadding; Marshal.StructureToPtr(RECT,m.LParam,FALSE); } ,否则 { NCCALSIZE_PARAMS rects =(NCCALSIZE_PARAMS)Marshal.PtrToStructure(m.LParam的typeof(NCCALSIZE_PARAMS)); rects.newWindow.left + = clientPadding; rects.newWindow.right - = clientPadding; rects.newWindow.top + = clientPadding; rects.newWindow.bottom - = clientPadding; Marshal.StructureToPtr(rects,m.LParam,FALSE); } } 如果(m.Msg == 0x85未)// WM_NCPAINT { IntPtr的WDC = GetWindowDC(手柄);使用(图形G = Graphics.FromHdc(WDC)){ ControlPaint.DrawBorder(G,新的Rectangle(0,0,Size.Width,Size.Height),BORDERCOLOR,actualBorderWidth,ButtonBorderStyle.Solid , BORDERCOLOR,actualBorderWidth,ButtonBorderStyle.Solid,BORDERCOLOR,actualBorderWidth,ButtonBorderStyle.Solid, BORDERCOLOR,actualBorderWidth,ButtonBorderStyle.Solid); } 的回报; } base.WndProc(REF米); } } 下面是文本框的快照: FillRegion A 图形的方式油漆与各种的边界刷,这里我用 HatchBrush : 公共类CustomTextBox:文本框 {函数[DllImport(USER32)] 私人静态外部的IntPtr GetWindowDC(IntPtr的HWND); 结构RECT {公众诠释左,上,右,下; } 结构NCCALSIZE_PARAMS {公共RECT newWindow; 公共RECT oldWindow; 公共RECT clientWindow; IntPtr的WINDOWPOS; } INT clientPadding = 2; INT actualBorderWidth = 4; 保护覆盖无效的WndProc(参考消息M) { //我们必须改变clientsize腾出空间边界 //如果没有,边框如何限制厚是。如果(m.Msg == 0X83)//如果WM_NCCALCSIZE {(m.WParam == IntPtr.Zero) { RECT RECT =(RECT )Marshal.PtrToStructure(m.LParam的typeof(RECT)); rect.left + = clientPadding; rect.right - = clientPadding; rect.top + = clientPadding; rect.bottom - = clientPadding; Marshal.StructureToPtr(RECT,m.LParam,FALSE); } ,否则 { NCCALSIZE_PARAMS rects =(NCCALSIZE_PARAMS)Marshal.PtrToStructure(m.LParam的typeof(NCCALSIZE_PARAMS)); rects.newWindow.left + = clientPadding; rects.newWindow.right - = clientPadding; rects.newWindow.top + = clientPadding; rects.newWindow.bottom - = clientPadding; Marshal.StructureToPtr(rects,m.LParam,FALSE); } } 如果(m.Msg == 0x85未)// WM_NCPAINT { IntPtr的WDC = GetWindowDC(手柄);使用(图形G = Graphics.FromHdc(WDC)){矩形RECT =新的Rectangle(0,0,宽,高); 矩形内=新的Rectangle(0,0,宽度,高度); inner.Offset(actualBorderWidth + 2,+ actualBorderWidth 2); inner.Width - = 2 * actualBorderWidth + 4; inner.Height - = 2 * actualBorderWidth + 4; 区域R =新区域(矩形); r.Xor(内); 使用(System.Drawing.Drawing2D.HatchBrush刷=新System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.SmallCheckerBoard,Color.Green,Color.Red)) { g.FillRegion(刷,R); } } 的回报; } base.WndProc(REF米); } } 下面是文本框快照: 结果, I'm trying to create a custom onPaint for my textbox, it is working... it is working But when I try to type something, a textbox is rendering above the textbox.This is my constructor:public TextBox() { Font = new System.Drawing.Font("Segoe UI", 11F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0))); BackColor = Color.White; BorderColor = Color.Gray; BorderStyle = System.Windows.Forms.BorderStyle.None; SetStyle(ControlStyles.UserPaint, true); }And the onPaint:protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(backgroundBrush, 0, 0, this.Width, this.Height); SizeF fontSize = g.MeasureString(Text, Font); g.DrawString(Text, Font, new SolidBrush(ForeColor), new PointF(5, 5), cFormat); g.DrawRectangle(borderPen, borderPen.Width / 2, borderPen.Width / 2, this.Width - borderPen.Width, this.Height - borderPen.Width); } 解决方案 If you just want a custom TextBox with some custom border (width and color), I have 2 solutions here:Using ControlPaint, this will allow you to draw border with some style and color but can't use Brush to draw more variously (like a HatchBrush can do):public class CustomTextBox : TextBox{ [DllImport("user32")] private static extern IntPtr GetWindowDC(IntPtr hwnd); struct RECT { public int left, top, right, bottom; } struct NCCALSIZE_PARAMS { public RECT newWindow; public RECT oldWindow; public RECT clientWindow; IntPtr windowPos; } float clientPadding = 2; float actualBorderWidth = 4; Color borderColor = Color.Red; protected override void WndProc(ref Message m) { //We have to change the clientsize to make room for borders //if not, the border is limited in how thick it is. if (m.Msg == 0x83) //WM_NCCALCSIZE { if (m.WParam == IntPtr.Zero) { RECT rect = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT)); rect.left += clientPadding; rect.right -= clientPadding; rect.top += clientPadding; rect.bottom -= clientPadding; Marshal.StructureToPtr(rect, m.LParam, false); } else { NCCALSIZE_PARAMS rects = (NCCALSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NCCALSIZE_PARAMS)); rects.newWindow.left += clientPadding; rects.newWindow.right -= clientPadding; rects.newWindow.top += clientPadding; rects.newWindow.bottom -= clientPadding; Marshal.StructureToPtr(rects, m.LParam, false); } } if (m.Msg == 0x85) //WM_NCPAINT { IntPtr wDC = GetWindowDC(Handle); using(Graphics g = Graphics.FromHdc(wDC)){ ControlPaint.DrawBorder(g, new Rectangle(0,0,Size.Width, Size.Height), borderColor, actualBorderWidth, ButtonBorderStyle.Solid, borderColor, actualBorderWidth, ButtonBorderStyle.Solid, borderColor, actualBorderWidth, ButtonBorderStyle.Solid, borderColor, actualBorderWidth, ButtonBorderStyle.Solid); } return; } base.WndProc(ref m); }}Here is the textbox snapshot:using FillRegion method of a Graphics to paint the border with various kinds of Brush, here I use HatchBrush:public class CustomTextBox : TextBox{ [DllImport("user32")] private static extern IntPtr GetWindowDC(IntPtr hwnd); struct RECT { public int left, top, right, bottom; } struct NCCALSIZE_PARAMS { public RECT newWindow; public RECT oldWindow; public RECT clientWindow; IntPtr windowPos; } int clientPadding = 2; int actualBorderWidth = 4; protected override void WndProc(ref Message m) { //We have to change the clientsize to make room for borders //if not, the border is limited in how thick it is. if (m.Msg == 0x83) //WM_NCCALCSIZE { if (m.WParam == IntPtr.Zero) { RECT rect = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT)); rect.left += clientPadding; rect.right -= clientPadding; rect.top += clientPadding; rect.bottom -= clientPadding; Marshal.StructureToPtr(rect, m.LParam, false); } else { NCCALSIZE_PARAMS rects = (NCCALSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NCCALSIZE_PARAMS)); rects.newWindow.left += clientPadding; rects.newWindow.right -= clientPadding; rects.newWindow.top += clientPadding; rects.newWindow.bottom -= clientPadding; Marshal.StructureToPtr(rects, m.LParam, false); } } if (m.Msg == 0x85) //WM_NCPAINT { IntPtr wDC = GetWindowDC(Handle); using(Graphics g = Graphics.FromHdc(wDC)){ Rectangle rect = new Rectangle(0,0,Width,Height); Rectangle inner = new Rectangle(0, 0, Width, Height); inner.Offset(actualBorderWidth + 2, actualBorderWidth + 2); inner.Width -= 2 * actualBorderWidth + 4; inner.Height -= 2 * actualBorderWidth + 4; Region r = new Region(rect); r.Xor(inner); using (System.Drawing.Drawing2D.HatchBrush brush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.SmallCheckerBoard, Color.Green, Color.Red)) { g.FillRegion(brush, r); } } return; } base.WndProc(ref m); }}Here is the textbox snapshot: 这篇关于文本框自定义的OnPaint的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 上岸,阿里云!
08-22 22:54
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