java – 返回给定JTextPane位置的行号的方法？

发布时间：2020-12-15 04:50:22 所属栏目：Java 来源：网络整理

导读：我正在寻找一种方法来计算JTextPane中给定文本位置的行号,并启用包装. 例： This a very very very very very very very very very very very very very very very very very very very very very very long line. This is another very very very very very

我正在寻找一种方法来计算JTextPane中给定文本位置的行号,并启用包装.

例：

This a very very very very very very very very very very very very very very very very very very very very very very long line.
This is another very very very very very very very very very very very very very very very very very very very very very very long line.|

光标位于第四行,而不是两行.

有人可以为我提供该方法的实现：

int getLineNumber(JTextPane pane,int pos)
{
     return ???
}

解决方法

试试这个

/**
   * Return an int containing the wrapped line index at the given position
   * @param component JTextPane
   * @param int pos
   * @return int
   */
  public int getLineNumber(JTextPane component,int pos) 
  {
    int posLine;
    int y = 0;

    try
    {
      Rectangle caretCoords = component.modelToView(pos);
      y = (int) caretCoords.getY();
    }
    catch (BadLocationException ex)
    {
    }

    int lineHeight = component.getFontMetrics(component.getFont()).getHeight();
    posLine = (y / lineHeight) + 1;
    return posLine;
  }

（编辑：李大同）

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