215 lines
7.4 KiB
C#
215 lines
7.4 KiB
C#
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//---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation. All rights reserved.
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//
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//---------------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Text;
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using System.Windows;
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namespace ExtendedGrid.Microsoft.Windows.Controls
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{
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internal static class ClipboardHelper
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{
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private const string DATAGRIDVIEW_htmlPrefix = "Version:1.0\r\nStartHTML:00000097\r\nEndHTML:{0}\r\nStartFragment:00000133\r\nEndFragment:{1}\r\n";
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private const string DATAGRIDVIEW_htmlStartFragment = "<HTML>\r\n<BODY>\r\n<!--StartFragment-->";
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private const string DATAGRIDVIEW_htmlEndFragment = "\r\n<!--EndFragment-->\r\n</BODY>\r\n</HTML>";
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internal static void FormatCell(object cellValue, bool firstCell, bool lastCell, StringBuilder sb, string format)
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{
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bool csv = string.Equals(format, DataFormats.CommaSeparatedValue, StringComparison.OrdinalIgnoreCase);
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if (csv || string.Equals(format, DataFormats.Text, StringComparison.OrdinalIgnoreCase)
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|| string.Equals(format, DataFormats.UnicodeText, StringComparison.OrdinalIgnoreCase))
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{
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if (cellValue != null)
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{
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bool escapeApplied = false;
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int length = sb.Length;
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FormatPlainText(cellValue.ToString(), csv, new StringWriter(sb, CultureInfo.CurrentCulture), ref escapeApplied);
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if (escapeApplied)
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{
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sb.Insert(length, '"');
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}
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}
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if (lastCell)
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{
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// Last cell
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sb.Append('\r');
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sb.Append('\n');
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}
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else
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{
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sb.Append(csv ? ',' : '\t');
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}
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}
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else if (string.Equals(format, DataFormats.Html, StringComparison.OrdinalIgnoreCase))
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{
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if (firstCell)
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{
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// First cell - append start of row
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sb.Append("<TR>");
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}
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sb.Append("<TD>"); // Start cell
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if (cellValue != null)
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{
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FormatPlainTextAsHtml(cellValue.ToString(), new StringWriter(sb, CultureInfo.CurrentCulture));
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}
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else
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{
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sb.Append(" ");
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}
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sb.Append("</TD>"); // End cell
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if (lastCell)
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{
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// Last cell - append end of row
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sb.Append("</TR>");
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}
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}
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}
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internal static void GetClipboardContentForHtml(StringBuilder content)
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{
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content.Insert(0, "<TABLE>");
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content.Append("</TABLE>");
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// Marshal.SystemDefaultCharSize is 2 on WinXP Pro - so the offsets seem to be in character counts instead of bytes.
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int bytecountEndOfFragment = 135 + content.Length;
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int bytecountEndOfHtml = bytecountEndOfFragment + 36;
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string prefix = string.Format(CultureInfo.InvariantCulture, DATAGRIDVIEW_htmlPrefix, bytecountEndOfHtml.ToString("00000000", CultureInfo.InvariantCulture), bytecountEndOfFragment.ToString("00000000", CultureInfo.InvariantCulture)) + DATAGRIDVIEW_htmlStartFragment;
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content.Insert(0, prefix);
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content.Append(DATAGRIDVIEW_htmlEndFragment);
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}
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private static void FormatPlainText(string s, bool csv, TextWriter output, ref bool escapeApplied)
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{
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if (s != null)
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{
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int length = s.Length;
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for (int i = 0; i < length; i++)
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{
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char ch = s[i];
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switch (ch)
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{
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case '\t':
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if (!csv)
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{
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output.Write(' ');
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}
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else
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{
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output.Write('\t');
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}
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break;
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case '"':
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if (csv)
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{
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output.Write("\"\"");
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escapeApplied = true;
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}
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else
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{
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output.Write('"');
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}
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break;
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case ',':
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if (csv)
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{
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escapeApplied = true;
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}
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output.Write(',');
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break;
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default:
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output.Write(ch);
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break;
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}
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}
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if (escapeApplied)
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{
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output.Write('"');
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}
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}
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}
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// Code taken from ASP.NET file xsp\System\Web\httpserverutility.cs; same in DataGridViewCell.cs
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private static void FormatPlainTextAsHtml(string s, TextWriter output)
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{
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if (s == null)
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{
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return;
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}
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int cb = s.Length;
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char prevCh = '\0';
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for (int i = 0; i < cb; i++)
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{
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char ch = s[i];
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switch (ch)
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{
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case '<':
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output.Write("<");
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break;
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case '>':
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output.Write(">");
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break;
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case '"':
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output.Write(""");
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break;
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case '&':
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output.Write("&");
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break;
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case ' ':
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if (prevCh == ' ')
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{
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output.Write(" ");
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}
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else
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{
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output.Write(ch);
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}
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break;
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case '\r':
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// Ignore \r, only handle \n
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break;
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case '\n':
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output.Write("<br>");
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break;
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// REVIEW: what to do with tabs? See original code in xsp\System\Web\httpserverutility.cs
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default:
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// The seemingly arbitrary 160 comes from RFC
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if (ch >= 160 && ch < 256)
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{
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output.Write("&#");
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output.Write(((int)ch).ToString(NumberFormatInfo.InvariantInfo));
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output.Write(';');
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}
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else
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{
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output.Write(ch);
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}
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break;
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}
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prevCh = ch;
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}
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}
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}
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}
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