CODEWITHSUNDEEP
itext7spacingparagraph
Edward Sheriff Curtis
Edward Sheriff Curtis

Reputation: 497

How to reducing spacing between paragraphs IText 7?

How can I reduce the line spacing between "Section 1" and "Alert" using IText 7?

enter image description here

These are values stored in the table of ​database

<h3 style=color:#0000ff;><strong>Section 1</strong></h3>
<h4><strong>- Alert</strong></h4>

I have tried without success these links because don't changing the line spacing between "Section 1" and "Alert"

  1. https://kb.itextpdf.com/home/it7kb/faq/how-to-change-the-line-spacing-of-text
  2. How to adjust spacing between paragraphs in iText7

My code below

if (dt.Rows.Count > 0)
{
    for (int i = 0; i < dt.Rows.Count; i++)
    {
        contents = new Paragraph(dt.Rows[i]["contents"].ToString())
            .SetTextAlignment(TextAlignment.JUSTIFIED)
            .SetFontSize(12)
            .SetMultipliedLeading(0.0f);

        List<IElement> lst = HtmlConverter.ConvertToElements(dt.Rows[i]["contents"].ToString()).ToList();
        for (int j = 0; j < lst.Count; j++)
        {
            IBlockElement element = (IBlockElement)lst[j];

            if (dt.Rows[i]["contents"].ToString().StartsWith("<h3 style=color:#0000ff;><strong>Section"))
            {
                contents.SetFontSize(12)
                    .SetBold()
                    .SetFontColor(ColorConstants.BLUE)
                    .SetMultipliedLeading(0.0f);
            }
            else if (dt.Rows[i]["contents"].ToString().StartsWith("<h4><strong>- "))
            {
                contents.SetFontSize(10)
                    .SetBold()
                    .SetFontColor(ColorConstants.BLACK)
                    .SetMultipliedLeading(0.0f);
            }
            else
            {
                contents.SetFontSize(10)
                    .SetFontColor(ColorConstants.BLACK)
                    .SetMultipliedLeading(0.0f);
            }

            document.Add(element);
        }
    }

    dest = filename.ToString();
}

Upvotes: 0

Views: 774

Answers (1)

rhens
rhens

Reputation: 4871

You're creating a Paragraph objects (called contents) from the HTML strings and applying properties to it, but not adding those objects to the document. You're also creating a List of elements by having HtmlConverter process the HTML strings. Those elements are added to the documents. So it's expected that none of the properties that are set on contents are visible in the PDF document.

You can simply rely on HtmlConverter to process the CSS properties.

String[] htmls = {
    "<h3 style=\"color:#0000ff;\"><strong>Section 1</strong></h3>",
    "<h4><strong>- Alert</strong></h4>"
};

PdfWriter writer = new PdfWriter("SO66694693.pdf");
PdfDocument pdfDoc = new PdfDocument(writer);
Document document = new Document(pdfDoc);

for (int i = 0; i < htmls.Length; i++)
{
        IList<IElement> lst = HtmlConverter.ConvertToElements(htmls[i]);
        for (int j = 0; j < lst.Count; j++)
        {
            IBlockElement element = (IBlockElement)lst[j];
            document.Add(element);
        }
}
document.Close();

Output:

PDF output

When adjusting the bottom margin on the first element and the top margin on the second element:

"<h3 style=\"color:#0000ff;margin-bottom: 0px;\"><strong>Section 1</strong></h3>",
"<h4 style=\"margin-top: 0px;\"><strong>- Alert</strong></h4>"

Output:

PDF output

If you prefer to change the properties using SetMargin(), SetMarginBottom(), etc, instead of CSS properties, make sure you're doing that on the objects you're actually adding to the document.

Upvotes: 1

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