文本框自定义的OnPaint [英] Textbox custom onPaint

查看：165 发布时间：2016/9/7 12:26:20 c# winforms

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

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：
< IMG SRC =http://i.stack.imgur.com/qTGmH.pngALT =>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IT屋！

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