WinForm中使用自定义Tooltip控件

• private ToolTip tooltipCtr;
• 构造函数中：
  • 隐藏默认的Tooltip：this.ShowCellToolTips = false;
  • this.tooltipCtr = new ToolTip();
  • 设置停留时间（还有许多其他时间设置）：this.tooltipCtr.AutoPopDelay = 1000 * 60;
  • 在CellMouseEnterHandler等事件中设置数据，在鼠标处设置文本：tooltipCtr.Show(HttpUtility.HtmlDecode(((BasicData)this.Rows[rowIndex].DataBoundItem).VarDescLong), this, PointToClient(MousePosition));
  • 限制宽度/每行字符数（自动换行）

    •  1         private const int maximumSingleLineTooltipLength = 120;
       2 
       3         private static string AddNewLinesForTooltip(string text)
       4         {
       5             if (text.Length < maximumSingleLineTooltipLength)
       6                 return text;
       7 
       8             StringBuilder sb = new StringBuilder();
       9 
      10             int currentLinePosition = 0;
      11             for (int textIndex = 0; textIndex < text.Length; textIndex++)
      12             {
      13                 sb.Append(text[textIndex]);
      14 
      15                 // if reach the original new line in the text
      16                 // just recount
      17                 if (text[textIndex].Equals(Environment.NewLine)
      18                     || (text[textIndex].Equals('\n') && textIndex >= 1 && text[textIndex - 1].Equals('\r')))
      19                 {
      20                     currentLinePosition = 0;
      21                     continue;
      22                 }
      23 
      24                 // If we have reached the target line length 
      25                 // and the nextcharacter is whitespace 
      26                 // and don't break \r\n
      27                 // then begin a new line.
      28                 if (currentLinePosition >= maximumSingleLineTooltipLength
      29                     && char.IsWhiteSpace(text[textIndex])
      30                     && !(text[textIndex].Equals('\r') && textIndex < text.Length && text[textIndex + 1].Equals('\n')))
      31                 {
      32                     sb.Append(Environment.NewLine);
      33                     currentLinePosition = 0;
      34                     continue;
      35                 }
      36 
      37                 // Append the next character.
      38                 if (textIndex < text.Length)
      39                 {
      40                     currentLinePosition++;
      41                 }
      42             }
      43 
      44             return sb.ToString();
      45         }

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