Question

如果我在一个没有要在itext PDF中显示的行的新页面上，我需要能够告诉抑制列标题。我发现了一个自定义的PDfPageEvent类，它实现了原始的PdfPageEvent接口并实现了onStartPage方法，如下所示：

public class PdfPageEvent implements com.lowagie.text.pdf.PdfPageEvent {
    Report report;

    public PdfPageEvent(Report report) {
        this.report = report;
    }

    public void onStartPage(PdfWriter writer, Document document) {
        ReportTable table = report.getPageHeaderForPDF();
        if (table != null) {
            PdfPTable pTable = ((PdfReportTable) table).getTable();
            pTable.setTotalWidth(document.getPageSize().getRight() - document.getPageSize().getLeft() - 20);
            pTable.writeSelectedRows(0, -1, 10, document.getPageSize().getTop() - 10, writer.getDirectContent());
        }
    }

    public void onEndPage(PdfWriter writer, Document document) {
        ReportTable table = report.getPageFooter();
        if (table != null) {
            PdfPTable pTable = ((PdfReportTable) table).getTable();
            pTable.setTotalWidth(document.getPageSize().getRight() - document.getPageSize().getLeft() - 20);
            pTable.writeSelectedRows(0, -1, 10, document.getPageSize().getBottom() + 20, writer.getDirectContent());
        }
    }

    public void onOpenDocument(PdfWriter writer, Document document) {
    }

    public void onCloseDocument(PdfWriter writer, Document document) {
    }

    public void onParagraph(PdfWriter writer, Document document, float paragraphPosition) {
    }

    public void onParagraphEnd(PdfWriter writer, Document document, float paragraphPosition) {
    }

    public void onChapter(PdfWriter writer, Document document, float paragraphPosition, Paragraph title) {
    }

    public void onChapterEnd(PdfWriter writer, Document document, float paragraphPosition) {
    }

    public void onSection(PdfWriter writer, Document document, float paragraphPosition, int depth, Paragraph title) {
    }

    public void onSectionEnd(PdfWriter writer, Document document, float paragraphPosition) {
    }

    public void onGenericTag(PdfWriter writer, Document document, Rectangle rect, String text) {
    }
}

打印列标题的逻辑存在于＆＃34; report.getPageHeaderForPDF（）＆＃34;中。我如何尝试检测我是否在新的pdf页面上并且writer.getDirectContent（）至少有一行添加到该新页面？

我想我可以在新页面上使用这两个检测：

int pageNumber = writer.getPageNumber();
int currentPageNumber = writer.getCurrentPageNumber();

但是如何根据writer.getDirectContent（）的内容判断是否还有任何实际行要在该页面上打印？

如何检测我是否在iText PDF的新页面上？

0 个答案: