将PdfPCell添加到段落中 [英] Add PdfPCell to Paragraph

问题描述

我正在尝试使用iTextSharp在段落句子的中间添加一个TextField（acrofield）。一个例子是生效日期是[月] [日]，[年]这将开始。

I'm trying to add a TextField (acrofield) in the middle of a Paragraph sentence using iTextSharp. An example would be "The Effective Date is [Day] day of [Month], [Year] that this will begin."

我尝试的事情：

Paragraph para1 = new Paragraph();
para1.Add(New Phrase("The Effective Date is",fontBold));
    //The next line is where it breaks, "Insertion of illegal Element: 30"
para1.Add(CreateTextField("Day",1,0)); //this function returns a PdfPCell.

---

---

PdfPCell tempCell = new PdfPCell();
tempCell.AddElement(new Phrase("The Effective Date is",fontBold));
    //the next line breaks as well, "Element not allowed."
tempCell.AddElement(CreateTextField("Day",1,0));

---

---

Paragraph para1 = new Paragraph();
para1.Add(New Phrase("The Effective Date is",fontBold));
para1.AddSpecial(CreateTextField("Day",1,0));
    //This doesn't generate an error, but the TextField is not displayed on PDF

---

---

Paragraph para1 = new Paragraph();
PdfPTable tempTable = new PdfPTable(1);
para1.Add(New Phrase("Hello",fontBold));
tempTable.AddCell(CreateTextField("Day",1,0));
para1.Add(tempTable);
para1.Add(New Phrase("World",fontBold));
    //This doesn't generate an error, but the TextField is not displayed on PDF

我知道CreateTextField（...）有效，因为我在页面上的其他几个地方使用它。

I know the CreateTextField(...) works because I am using it in several other places on the page.

如何在不添加其他文本的情况下添加TextField使用表格并繁琐地试图操纵单元格大小以适应我的需要？

How can I add a TextField inline with other text without using tables and tediously trying to manipulate cell size to accommodate what I need?

感谢您的帮助！

推荐答案

你的问题是对的。您不希望将 PdfPCell 添加到段落。您想要创建内联表单字段。这是一个完全不同的问题。

Your question is wrong. You don't want to add a PdfPCell to a Paragraph. You want to create inline form fields. That's a totally different question.

看一下 GenericFields 示例。在这个例子中，我们创建你需要的段落：

Take a look at the GenericFields example. In this example, we create the Paragraph you need like this:

Paragraph p = new Paragraph();
p.add("The Effective Date is ");
Chunk day = new Chunk("     ");
day.setGenericTag("day");
p.add(day);
p.add(" day of ");
Chunk month = new Chunk("     ");
month.setGenericTag("month");
p.add(month);
p.add(", ");
Chunk year = new Chunk("            ");
year.setGenericTag("year");
p.add(year);
p.add(" that this will begin.");

你看到我们如何添加空块你想在哪里添加 PdfPCell ？我们在这些 Chunk 对象上使用 setGenericTag（）方法添加一个表单字段，其中 Chunk s被渲染。

Do you see how we add empty Chunks where you want to add a PdfPCell? We use the setGenericTag() method on these Chunk object to add a form field where ever the Chunks are rendered.

为此，我们需要声明一个页面事件：

For this to work, we need to declare a page event:

writer.setPageEvent(new FieldChunk());

FieldChunk 类如下所示：

public class FieldChunk extends PdfPageEventHelper {
    @Override
    public void onGenericTag(PdfWriter writer, Document document, Rectangle rect, String text) {
        TextField field = new TextField(writer, rect, text);
        try {
            writer.addAnnotation(field.getTextField());
        } catch (IOException ex) {
            throw new ExceptionConverter(ex);
        } catch (DocumentException ex) {
            throw new ExceptionConverter(ex);
        }
    }
}

每次通用块 渲染时，将调用 onGenericTag（）方法，将我们在 setGenericTag（）方法中使用的参数传递为 text 参数。我们使用 writer ， rect 和 text 参数来创建并添加 TextField 。结果如下所示：

Every time a "generic chunk" is rendered, the onGenericTag() method will be called passing the parameter we used in the setGenericTag() method as the text parameter. We use the writer, rect and text parameters to create and add a TextField. The result looks like this:

< img src =https://i.stack.imgur.com/Dg9Et.pngalt =在此输入图像说明>

随意如果你想创建一个更大的文本字段，以适应 rect 。

Feel free to adapt rect if you want to create a bigger text field.

重要：我的例子是用Java编写的。如果要将示例移植到C＃，只需将每个方法的第一个字母更改为大写（例如，将 add（）更改为 Add（） ）。如果这不起作用，请尝试将参数设置为成员变量（例如，将 writer.setPageEvent（event）更改为 writer.PageEvent = event ）。

Important: my example is written in Java. If you want to port the example to C#, just change the first letter of each method to upper case (e.g. change add() into Add()). If that doesn't work, try setting the parameter as a member variable (e.g. change writer.setPageEvent(event) into writer.PageEvent = event).

更新：如果你想让字段更大，你应该创建一个新的矩形。例如：

Update: If you want to make the field bigger, you should create a new Rectangle. For instance:

Rectangle rect2 = new Rectangle(rect.Left, rect.Bottom - 5, rect.Right, rect.Top + 2);
TextField field = new TextField(writer, rect2, text);

这篇关于将PdfPCell添加到段落中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！