iTextsharp,PdfPCell.VerticalAlignment和PdfPCell.Horizo​​ntalAlignment

Question

我试图找出如何让我的文本在PdfPCell中显示在中间.我尝试过很多不同的选择,比如:

myCell.VerticalAlignment = Element.ALIGN_MIDDLE;
myCell.VerticalAlignment = PdfPCell.ALIGN_MIDDLE;
myCell.VerticalAlignment = Rectangle.ALIGN_MIDDLE;

这些都不适合我.VerticalAlignment需要一个int,所以我试着创建一个循环,看看我是否能找到正确的数字,但是所有东西都只是左下方对齐..

   Document myDocument = new Document(PageSize.A4);

   PdfWriter myPdfWriter = PdfWriter.GetInstance(myDocument, new FileStream(strPDFFilePath, FileMode.Create));
   myDocument.Open();

   myDocument.NewPage();

   PdfContentByte myPdfContentByte = myPdfWriter.DirectContent;

   PdfPCell myCell;
   Paragraph myParagraph;

   PdfPTable myTable = new PdfPTable(4);
   myTable.WidthPercentage = 100;
   myTable.SetWidths(new int[4] { 25, 25, 25, 25 });

   myTable.DefaultCell.BorderWidth = 1;
   myTable.DefaultCell.BorderColor = BaseColor.RED;                

   for (int i = -100; i < 100; i++)
   {
       myParagraph = new Paragraph(String.Format("Alignment: {0}", i));
       myParagraph.Font.SetFamily("Verdana");
       myParagraph.Font.SetColor(72, 72, 72);
       myParagraph.Font.Size = 11;

       myCell = new PdfPCell();
       myCell.AddElement(myParagraph);
       myCell.HorizontalAlignment = i;
       myCell.VerticalAlignment = i;                    
       myTable.AddCell(myCell);
   }

   myDocument.Add(myTable);
   myDocument.Add(new Chunk(String.Empty));
   myDocument.Close();

Answer 1

我认为您遇到的基本问题是您正在向iTextSharp Paragraph对象添加文本,然后尝试使用PdfPCell包含它的对象设置此文本的对齐方式.我不确定该PdfPCell.VerticalAlignment属性是仅用于PdfPCell文本,还是对齐Paragraph内部对象PdfPCell没有任何影响,您可以在测试中看到.

你还设置myCell.HorizontalAlignment并myCell.VerticalAlignment在您的索引值for循环.我认为你的意思是使用1个实例i.

无论如何,设置PdfPCell HorizontalAlignment和VerticalAlignment属性确实有效.下面是一个演示此问题的小方法.我根据你想要做的事情写得很松散; 如果它足够接近你想要做的事情,也许你可以将它作为项目的起点.

private void TestTableCreation() {
    using (FileStream fs = new FileStream("TableTest.pdf", FileMode.Create)) {
        Document doc = new Document(PageSize.A4);
        PdfWriter.GetInstance(doc, fs);
        doc.Open();

        PdfPTable table = new PdfPTable(4);

        for (int i = -100; i < 100; i++) {
            PdfPCell cell = new PdfPCell(new Phrase(String.Format("Alignment: {0}", i)));
            // Give our rows some height so we can see test vertical alignment.
            cell.FixedHeight = 30.0f;

            // ** Try it **
            //cell.HorizontalAlignment = Element.ALIGN_LEFT;
            //cell.HorizontalAlignment = Element.ALIGN_CENTER;
            cell.HorizontalAlignment = Element.ALIGN_RIGHT;

            cell.VerticalAlignment = Element.ALIGN_TOP;
            //cell.VerticalAlignment = Element.ALIGN_MIDDLE;
            //cell.VerticalAlignment = Element.ALIGN_BOTTOM;

            table.AddCell(cell);
        }

        doc.Add(table);
        doc.Close();
    }
}

Answer 2

当我添加以下内容时，Jay Riggs解决方案也开始为垂直对齐工作：

cell.UseAscender = true;

http://www.afterlogic.com/mailbee-net/docs-itextsharp/html/0602b79e-ea9c-0c7d-c4b2-bc4b5f976f15.htm