如何在单元格中截断文本

Question

如何指示具有某些字符（例如省略号）的用户，如果单元格中的文本延伸超过单元格的固定高度，则单元格中的文本将被截断。

pdfTable = new PdfPTable (1);
pdfTable.setWidthPercentage(100);
cell = new PdfPCell(new Paragraph("Label Heading", statementLabelFont));
pdfTable.addCell(cell);

StringBuffer str = new StringBuffer();
for (data : dataList) {
    str.append(data != null ?data.getdata1() :"");
    str.append(strSeparator);           
}

cell = new PdfPCell();
cell.setFixedHeight(100f);      
cell.setCellEvent(new TruncateContent(str.toString()));
pdfTable.addCell(cell);

static class TruncateContent implements PdfPCellEvent {
    protected String content;

    public TruncateContent(String content) {
        this.content = content;
    }
    public void cellLayout(PdfPCell cell, Rectangle position,
            PdfContentByte[] canvases) {
        try {
            BaseFont bf = BaseFont.createFont();
            Font font = new Font(bf, 12);
            float availableWidth = position.getWidth();
            int contentLength = content.length();
            int leftChar = 0;
            int rightChar = contentLength - 1;
            availableWidth -= bf.getWidthPoint("...", 12);

            while (leftChar < contentLength && rightChar != leftChar) {
                availableWidth -= bf.getWidthPoint(content.charAt(leftChar), 12);
                if (availableWidth > 0)
                    leftChar++;
                else
                    break;
                availableWidth -= bf.getWidthPoint(content.charAt(rightChar), 12);
                if (availableWidth > 0)
                    rightChar--;
                else
                    break;
            }

            String newContent = content.substring(0, leftChar) + "..." + content.substring(rightChar);

            PdfContentByte canvas = canvases[PdfPTable.TEXTCANVAS];
            ColumnText ct = new ColumnText(canvas);
            ct.setSimpleColumn(position.getLeft(), position.getBottom(), position.getRight(), position.getTop());
            ct.addElement(new Paragraph(newContent, font));
            ct.go();
        } catch (DocumentException e) {
            throw new ExceptionConverter(e);
        } catch (IOException e) {
            throw new ExceptionConverter(e);
        }
    }
}