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）

    •         private const int maximumSingleLineTooltipLength = 120;
      
              private static string AddNewLinesForTooltip(string text)
              {
                  if (text.Length < maximumSingleLineTooltipLength)
                      return text;
      
                  StringBuilder sb = new StringBuilder();
      
                  int currentLinePosition = 0;
                  for (int textIndex = 0; textIndex < text.Length; textIndex++)
                  {
                      sb.Append(text[textIndex]);
      
                      // if reach the original new line in the text
                      // just recount
                      if (text[textIndex].Equals(Environment.NewLine)
                          || (text[textIndex].Equals('
      ') && textIndex >= 1 && text[textIndex - 1].Equals('
      ')))
                      {
                          currentLinePosition = 0;
                          continue;
                      }
      
                      // If we have reached the target line length 
                      // and the nextcharacter is whitespace 
                      // and don't break 
      
                      // then begin a new line.
                      if (currentLinePosition >= maximumSingleLineTooltipLength
                          && char.IsWhiteSpace(text[textIndex])
                          && !(text[textIndex].Equals('
      ') && textIndex < text.Length && text[textIndex + 1].Equals('
      ')))
                      {
                          sb.Append(Environment.NewLine);
                          currentLinePosition = 0;
                          continue;
                      }
      
                      // Append the next character.
                      if (textIndex < text.Length)
                      {
                          currentLinePosition++;
                      }
                  }
      
                  return sb.ToString();
              }