关于java：在itext7中为跨越多页的表格绘制自定义边框

Draw custom borders for table spanning across more than one page in itext7

如果我喜欢它：
itext在工作期间如何找出坐标文本？

一切正常。但是，如果我创建表多一页，则不会绘制任何内容：

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PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
Document doc = new Document(pdfDoc);
doc.add(new Paragraph("Table event"));
Table table = new Table(UnitValue.createPercentArray(3)).useAllAvailableWidth();
table.setNextRenderer(new DottedLineTableRenderer(table, new Table.RowRange(0, 0)));
table.addCell(new Cell().add(new Paragraph("test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
test\
" )).setBorder(Border.NO_BORDER));
table.addCell(new Cell().add(new Paragraph("A2")).setBorder(Border.NO_BORDER));
table.addCell(new Cell().add(new Paragraph("A3")).setBorder(Border.NO_BORDER));

doc.add(table);
doc.close();

自定义渲染器类：

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private class DottedLineTableRenderer extends TableRenderer {
public DottedLineTableRenderer(Table modelElement, Table.RowRange rowRange) {
super(modelElement, rowRange);
}

@Override
public void drawChildren(DrawContext drawContext) {
super.drawChildren(drawContext);
PdfCanvas canvas = drawContext.getCanvas();
canvas.setLineDash(3f, 3f);
// first horizontal line
CellRenderer[] cellRenderers = rows.get(0);
canvas.moveTo(cellRenderers[0].getOccupiedArea().getBBox().getLeft(),
cellRenderers[0].getOccupiedArea().getBBox().getTop());
canvas.lineTo(cellRenderers[cellRenderers.length - 1].getOccupiedArea().getBBox().getRight(),
cellRenderers[cellRenderers.length - 1].getOccupiedArea().getBBox().getTop());

for (int i = 0; i < rows.size(); i++) {
cellRenderers = rows.get(i);
// horizontal lines
canvas.moveTo(cellRenderers[0].getOccupiedArea().getBBox().getX(),
cellRenderers[0].getOccupiedArea().getBBox().getY());
canvas.lineTo(cellRenderers[cellRenderers.length - 1].getOccupiedArea().getBBox().getRight(),
cellRenderers[cellRenderers.length - 1].getOccupiedArea().getBBox().getBottom());
// first vertical line
Rectangle cellRect = cellRenderers[0].getOccupiedArea().getBBox();
canvas.moveTo(cellRect.getLeft(), cellRect.getBottom());
canvas.lineTo(cellRect.getLeft(), cellRect.getTop());
// vertical lines
for (int j = 0; j < cellRenderers.length; j++) {
cellRect = cellRenderers[j].getOccupiedArea().getBBox();
canvas.moveTo(cellRect.getRight(), cellRect.getBottom());
canvas.lineTo(cellRect.getRight(), cellRect.getTop());
}
}
canvas.stroke();
}
}

我可以解决吗？

enter image description here

相关讨论

您使用的代码对TableRenderer中的内部实现方式有许多假设。

就像在您的代码中一样，您正在绘制虚线边框，我必须将您指向DashedBorder类，您可以直接使用它：

1 2	Border customBorder = new DashedBorder(ColorConstants.RED, 2); table.addCell(new Cell().add(new Paragraph("A2")).setBorder(customBorder));

您还可以通过以下方式实现您的自定义边框类：

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private static class CustomBorder extends Border {
protected CustomBorder(Color color, float width) {
super(color, width);
}

@Override
public void draw(PdfCanvas canvas, float x1, float y1, float x2, float y2, Side defaultSide, float borderWidthBefore, float borderWidthAfter) {
}

@Override
public void drawCellBorder(PdfCanvas canvas, float x1, float y1, float x2, float y2, Side defaultSide) {
canvas.
saveState().
setStrokeColor(transparentColor.getColor());
transparentColor.applyStrokeTransparency(canvas);
canvas.
setLineDash(3, 3).
setLineWidth(width).
moveTo(x1, y1).
lineTo(x2, y2).
stroke().
restoreState();
}

@Override
public int getType() {
return Border.DASHED;
}
}

然后只需创建一个实例并在setBorder中使用它：

1 2	Border customBorder = new CustomBorder(ColorConstants.RED, 2); table.addCell(new Cell().add(new Paragraph("A2")).setBorder(customBorder));