C# 如何设置 richTextBoxr的边距

 

附件 http://files.cnblogs.com/xe2011/richTextBox_EM_SETRECT.rar

 

using System.Runtime.InteropServices; 



 public struct Rect

        {

            public int Left;

            public int Top;

            public int Right;

            public int Bottom;

        }



        [DllImport("user32.dll")]

        private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rect lParam);//



        private const int EM_GETRECT = 0x00b2;

        private const int EM_SETRECT = 0x00b3;



        public Rect RichTextBoxMargin

        {

            get

            {

                Rect rect = new Rect();

                SendMessage(richTextBox1.Handle, EM_GETRECT, IntPtr.Zero, ref rect);

                rect.Left += 1;

                rect.Top += 1;

                rect.Right = 1 + richTextBox1.ClientSize.Width - rect.Right;

                rect.Bottom = richTextBox1.ClientSize.Height - rect.Bottom;

                return rect;

            }

            set

            {

                Rect rect;

                rect.Left =  richTextBox1.ClientRectangle.Left + value.Left;

                rect.Top =   richTextBox1.ClientRectangle.Top + value.Top;

                rect.Right =  richTextBox1.ClientRectangle.Right - value.Right;

                rect.Bottom =  richTextBox1.ClientRectangle.Bottom - value.Bottom;



                SendMessage(richTextBox1.Handle, EM_SETRECT, IntPtr.Zero, ref rect);

            }



        }



        //设置

        private void button1_Click(object sender, EventArgs e)

        {

            Rect rect;

            rect.Left = 50;

            rect.Top = 50;

            rect.Right = 50;

            rect.Bottom = 50;



            RichTextBoxMargin = rect;

        }



        //获得

        private void button2_Click(object sender, EventArgs e)

        {

            Rect rect;

            rect = RichTextBoxMargin;



            MessageBox.Show( string.Format("Left = {0} top={1} right={2} bottom={3}",rect.Left,rect.Top,rect.Right,rect.Bottom));

        }

 

 放在自定义的类里面

  1 using System;

  2 using System.Collections.Generic;

  3 using System.Linq;

  4 using System.Text;

  5 using System.Runtime.InteropServices;

  6 

  7 namespace System.Windows.Forms

  8 {

  9     public class CustomRichTextBox:RichTextBox

 10     {

 11         public CustomRichTextBox()

 12         {

 13             richTextBox1=this;

 14         }

 15         private System.Windows.Forms.RichTextBox richTextBox1;

 16 

 17         private struct Rect

 18         {

 19             public int Left;

 20             public int Top;

 21             public int Right;

 22             public int Bottom;

 23         }

 24 

 25         [DllImport("user32.dll")]

 26         private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rect lParam);

 27 

 28         private const int EM_GETRECT = 0x00b2;

 29         private const int EM_SETRECT = 0x00b3;

 30 

 31         /// <summary>

 32         /// 当没设置的时候结果多出了L T R +2

 33         /// </summary>

 34         private Rect RichTextBoxMargin

 35         {

 36             get

 37             {

 38                 Rect rect = new Rect();

 39                 SendMessage(richTextBox1.Handle, EM_GETRECT, IntPtr.Zero, ref rect);

 40                 rect.Left += 1;

 41                 rect.Top += 1;

 42                 rect.Right = 1 + richTextBox1.DisplayRectangle.Width - rect.Right;

 43                 rect.Bottom = richTextBox1.DisplayRectangle.Height - rect.Bottom;

 44                 return rect;

 45             }

 46             set

 47             {

 48                 Rect rect;

 49                 rect.Left = richTextBox1.ClientRectangle.Left + value.Left;

 50                 rect.Top = richTextBox1.ClientRectangle.Top + value.Top;

 51                 rect.Right = richTextBox1.ClientRectangle.Right - value.Right;

 52                 rect.Bottom = richTextBox1.ClientRectangle.Bottom - value.Bottom;

 53 

 54                 SendMessage(richTextBox1.Handle, EM_SETRECT, IntPtr.Zero, ref rect);

 55             }

 56 

 57         }

 58 

 59 

 60         public int LeftMargin

 61         {

 62             get

 63             {

 64                 return RichTextBoxMargin.Left;

 65             }

 66             set

 67             {

 68                 Rect rect1;

 69                 rect1 = RichTextBoxMargin;

 70 

 71                 Rect rect;

 72                 rect.Left = value;

 73                 rect.Top = rect1.Top;

 74                 rect.Right = rect1.Right;

 75                 rect.Bottom = rect1.Bottom;

 76 

 77                 RichTextBoxMargin = rect;

 78             }

 79         }

 80 

 81 

 82         public int RightMargin

 83         {

 84             get

 85             {

 86                 return RichTextBoxMargin.Right;

 87             }

 88             set

 89             {

 90                 Rect rect1;

 91                 rect1 = RichTextBoxMargin;

 92 

 93                 Rect rect;

 94                 rect.Left = rect1.Left;

 95                 rect.Top = rect1.Top;

 96                 rect.Right = value;

 97                 rect.Bottom = rect1.Bottom;

 98 

 99                 RichTextBoxMargin = rect;

100             }

101         }

102 

103 

104         public int TopMargin

105         {

106             get

107             {

108                 return RichTextBoxMargin.Top;

109             }

110             set

111             {

112                 Rect rect1;

113                 rect1 = RichTextBoxMargin;

114 

115                 Rect rect;

116                 rect.Left = rect1.Left;

117                 rect.Top = value;

118                 rect.Right = rect1.Right;

119                 rect.Bottom = rect1.Bottom;

120 

121                 RichTextBoxMargin = rect;

122             }

123         }

124 

125         public int BottomMargin

126         {

127             get

128             {

129                 return RichTextBoxMargin.Bottom;

130             }

131             set

132             {

133                 Rect rect1;

134                 rect1 = RichTextBoxMargin;

135 

136                 Rect rect;

137                 rect.Left = rect1.Left;

138                 rect.Top = rect1.Top;

139                 rect.Right = rect1.Right;

140                 rect.Bottom = value;

141                 RichTextBoxMargin = rect;

142             }

143         }

144 

145 

146     }

147 }

CustomRichTextBox.cs

使用

 1         private void button1_Click(object sender, EventArgs e)

 2         {

 3             customRichTextBox1.LeftMargin = 2;

 4             customRichTextBox1.TopMargin = 2;

 5             customRichTextBox1.RightMargin = 30;

 6             customRichTextBox1.BottomMargin = 30;

 7         }

 8 

 9         private void button2_Click(object sender, EventArgs e)

10         {

11             Text = string.Format("Left={0} Right={1} Top={2} Bottom={3}", 

12                 customRichTextBox1.LeftMargin, 

13                 customRichTextBox1.TopMargin,

14                 customRichTextBox1.RightMargin,

15                 customRichTextBox1.BottomMargin);

16         }

View Code