复制代码 代码如下:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace RichTextBoxLinks
{
public class RichTextBoxEx : RichTextBox
{
#region Interop-Defines
[ StructLayout( LayoutKind.Sequential )]
private struct CHARFORMAT2_STRUCT
{
public UInt32cbSize;
public UInt32 dwMask;
public UInt32 dwEffects;
public Int32 yHeight;
public Int32 yOffset;
public Int32crTextColor;
public byte bCharSet;
public byte bPitchAndFamily;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=32)]
public char[] szFaceName;
public UInt16wWeight;
public UInt16sSpacing;
public intcrBackColor; // Color.ToArgb() -> int
public intlcid;
public intdwReserved;
public Int16sStyle;
public Int16wKerning;
public bytebUnderlineType;
public bytebAnimation;
public bytebRevAuthor;
public bytebReserved1;
}
[DllImport("user32.dll", CharSet=CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
private const int WM_USER = 0x0400;
private const int EM_GETCHARFORMAT = WM_USER+58;
private const int EM_SETCHARFORMAT = WM_USER+68;
private const int SCF_SELECTION= 0x0001;
private const int SCF_WORD= 0x0002;
private const int SCF_ALL= 0x0004;
#region CHARFORMAT2 Flags
private const UInt32 CFE_BOLD= 0x0001;
private const UInt32 CFE_ITALIC= 0x0002;
private const UInt32 CFE_UNDERLINE= 0x0004;
private const UInt32 CFE_STRIKEOUT= 0x0008;
private const UInt32 CFE_PROTECTED= 0x0010;
private const UInt32 CFE_LINK= 0x0020;
private const UInt32 CFE_AUTOCOLOR= 0x40000000;
private const UInt32 CFE_SUBSCRIPT= 0x00010000;/* Superscript and subscript are */
private const UInt32 CFE_SUPERSCRIPT= 0x00020000;/* mutually exclusive */
private const int CFM_SMALLCAPS= 0x0040;/* (*)*/
private const int CFM_ALLCAPS= 0x0080;/* Displayed by 3.0*/
private const int CFM_HIDDEN= 0x0100;/* Hidden by 3.0 */
private const int CFM_OUTLINE= 0x0200;/* (*)*/
private const int CFM_SHADOW= 0x0400;/* (*)*/
private const int CFM_EMBOSS= 0x0800;/* (*)*/
private const int CFM_IMPRINT= 0x1000;/* (*)*/
private const int CFM_DISABLED= 0x2000;
private const int CFM_REVISED= 0x4000;
private const int CFM_BACKCOLOR= 0x04000000;
private const int CFM_LCID= 0x02000000;
private const int CFM_UNDERLINETYPE= 0x00800000;/* Many displayed by 3.0 */
private const int CFM_WEIGHT= 0x00400000;
private const int CFM_SPACING= 0x00200000;/* Displayed by 3.0*/
private const int CFM_KERNING= 0x00100000;/* (*)*/
private const int CFM_STYLE= 0x00080000;/* (*)*/
private const int CFM_ANIMATION= 0x00040000;/* (*)*/
private const int CFM_REVAUTHOR= 0x00008000;
private const UInt32 CFM_BOLD= 0x00000001;
private const UInt32 CFM_ITALIC= 0x00000002;
private const UInt32 CFM_UNDERLINE= 0x00000004;
private const UInt32 CFM_STRIKEOUT= 0x00000008;
private const UInt32 CFM_PROTECTED= 0x00000010;
private const UInt32 CFM_LINK= 0x00000020;
private const UInt32 CFM_SIZE= 0x80000000;
private const UInt32 CFM_COLOR= 0x40000000;
private const UInt32 CFM_FACE= 0x20000000;
private const UInt32 CFM_OFFSET= 0x10000000;
private const UInt32 CFM_CHARSET= 0x08000000;
private const UInt32 CFM_SUBSCRIPT= CFE_SUBSCRIPT | CFE_SUPERSCRIPT;
private const UInt32 CFM_SUPERSCRIPT= CFM_SUBSCRIPT;
private const byte CFU_UNDERLINENONE= 0x00000000;
private const byte CFU_UNDERLINE= 0x00000001;
private const byte CFU_UNDERLINEWORD= 0x00000002; /* (*) displayed as ordinary underline*/
private const byte CFU_UNDERLINEDOUBLE= 0x00000003; /* (*) displayed as ordinary underline*/
private const byte CFU_UNDERLINEDOTTED= 0x00000004;
private const byte CFU_UNDERLINEDASH= 0x00000005;
private const byte CFU_UNDERLINEDASHDOT= 0x00000006;
private const byte CFU_UNDERLINEDASHDOTDOT= 0x00000007;
private const byte CFU_UNDERLINEWAVE= 0x00000008;
private const byte CFU_UNDERLINETHICK= 0x00000009;
private const byte CFU_UNDERLINEHAIRLINE= 0x0000000A; /* (*) displayed as ordinary underline*/
#endregion
#endregion
public RichTextBoxEx()
{
// Otherwise, non-standard links get lost when user starts typing
// next to a non-standard link
this.DetectUrls = false;
}
[DefaultValue(false)]
public new bool DetectUrls
{
get { return base.DetectUrls; }
set { base.DetectUrls = value; }
}
/// <summary>
/// Insert a given text as a link into the RichTextBox at the current insert position.
/// </summary>
/// <param name="text">Text to be inserted</param>
public void InsertLink(string text)
{
InsertLink(text, this.SelectionStart);
}
/// <summary>
/// Insert a given text at a given position as a link.
/// </summary>
/// <param name="text">Text to be inserted</param>
/// <param name="position">Insert position</param>
public void InsertLink(string text, int position)
{
if (position < 0 || position > this.Text.Length)
throw new ArgumentOutOfRangeException("position");
this.SelectionStart = position;
this.SelectedText = text;
this.Select(position, text.Length);
this.SetSelectionLink(true);
this.Select(position + text.Length, 0);
}
/// <summary>
/// Insert a given text at at the current input position as a link.
/// The link text is followed by a hash (#) and the given hyperlink text, both of
/// them invisible.
/// When clicked on, the whole link text and hyperlink string are given in the
/// LinkClickedEventArgs.
/// </summary>
/// <param name="text">Text to be inserted</param>
/// <param name="hyperlink">Invisible hyperlink string to be inserted</param>
public void InsertLink(string text, string hyperlink)
{
InsertLink(text, hyperlink, this.SelectionStart);
}
/// <summary>
/// Insert a given text at a given position as a link. The link text is followed by
/// a hash (#) and the given hyperlink text, both of them invisible.
/// When clicked on, the whole link text and hyperlink string are given in the
/// LinkClickedEventArgs.
/// </summary>
/// <param name="text">Text to be inserted</param>
/// <param name="hyperlink">Invisible hyperlink string to be inserted</param>
/// <param name="position">Insert position</param>
public void InsertLink(string text, string hyperlink, int position)
{
if (position < 0 || position > this.Text.Length)
throw new ArgumentOutOfRangeException("position");
this.SelectionStart = position;
this.SelectedRtf = @"{rtf1ansi "+text+@"v #"+hyperlink+@"v0}";
this.Select(position, text.Length + hyperlink.Length + 1);
this.SetSelectionLink(true);
this.Select(position + text.Length + hyperlink.Length + 1, 0);
}
/// <summary>
/// Set the current selection's link style
/// </summary>
/// <param name="link">true: set link style, false: clear link style</param>
public void SetSelectionLink(bool link)
{
SetSelectionStyle(CFM_LINK, link ? CFE_LINK : 0);
}
/// <summary>
/// Get the link style for the current selection
/// </summary>
/// <returns>0: link style not set, 1: link style set, -1: mixed</returns>
public int GetSelectionLink()
{
return GetSelectionStyle(CFM_LINK, CFE_LINK);
}
private void SetSelectionStyle(UInt32 mask, UInt32 effect)
{
CHARFORMAT2_STRUCT cf = new CHARFORMAT2_STRUCT();
cf.cbSize = (UInt32)Marshal.SizeOf(cf);
cf.dwMask = mask;
cf.dwEffects = effect;
IntPtr wpar = new IntPtr(SCF_SELECTION);
IntPtr lpar = Marshal.AllocCoTaskMem( Marshal.SizeOf( cf ) );
Marshal.StructureToPtr(cf, lpar, false);
IntPtr res = SendMessage(Handle, EM_SETCHARFORMAT, wpar, lpar);
Marshal.FreeCoTaskMem(lpar);
}
private int GetSelectionStyle(UInt32 mask, UInt32 effect)
{
CHARFORMAT2_STRUCT cf = new CHARFORMAT2_STRUCT();
cf.cbSize = (UInt32)Marshal.SizeOf(cf);
cf.szFaceName = new char[32];
IntPtr wpar = new IntPtr(SCF_SELECTION);
IntPtr lpar = Marshal.AllocCoTaskMem( Marshal.SizeOf( cf ) );
Marshal.StructureToPtr(cf, lpar, false);
IntPtr res = SendMessage(Handle, EM_GETCHARFORMAT, wpar, lpar);
cf = (CHARFORMAT2_STRUCT)Marshal.PtrToStructure(lpar, typeof(CHARFORMAT2_STRUCT));
int state;
// dwMask holds the information which properties are consistent throughout the selection:
if ((cf.dwMask & mask) == mask)
{
if ((cf.dwEffects & effect) == effect)
state = 1;
else
state = 0;
}
else
{
state = -1;
}
Marshal.FreeCoTaskMem(lpar);
return state;
}
}
}
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