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https://issues.apache.org/jira/browse/PDFBOX-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14346817#comment-14346817
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Maruan Sahyoun commented on PDFBOX-1402:
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I've added an initial version of a formatter for multiline text.
- uses font.encode() to encode a string
- uses some code from PDPageContentStream to avoid raw commands (shall be
moved into a joint class later)
- uses BreakIterator to get line breaking candidates instead of relying on the
space character
- uses AttributedString (although limited to width) to handle additional
properties. To be extended especially for Bidi support.
hopefully that's a good start to do further enhancements.
I'll now look into bringing in some of the changes [~oliverHofmann] proposed.
There are still a number of features missing but thought I'll commit anyway as
it already addresses some of the current issues.
> Improve handling of multiline text boxes
> ----------------------------------------
>
> Key: PDFBOX-1402
> URL: https://issues.apache.org/jira/browse/PDFBOX-1402
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 1.7.1
> Reporter: Will May
> Assignee: Maruan Sahyoun
> Labels: Appearance
> Fix For: 2.0.0
>
> Attachments: automatic-font-size-calculation.patch, multiLine.patch,
> multiline_linebreaks_alignment.patch, multiline_positioning.patch,
> pdf-sample-fields-out.pdf, pdf-sample-fields.filled.pdf, pdf-sample-fields.pdf
>
>
> The current implementation for setting the appearance of content that is
> added to a multiline text box is incorrect in a number of ways:
> * Doesn't position the start of the text in the correct location
> * Incorrectly uses font size '0' instead of auto-sizing the font
> * Doesn't break up very long lines
> * If the font size is very large, then the next line is started too close to
> the previous line.
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