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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Thank you for a very good question!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">The short answer is yes - it is possible to implement lazy styling in CodeArea, as well as to implement styling of large documents in a reasonable fashion.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">The styling is performed by the decoratorProperty of the CodeTextModel. Note: please check out the CodeAreaDemoApp in examples, along with a somewhat naïve implementation
in JavaSyntaxDecorator. This is a synchronous decorator, which means it will likely be unsuitable for large models.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">For the large models there are a few considerations that might impact the overall design:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">- is it possible to style a paragraph in isolation?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">- does the model support concurrent access?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">- can the syntax be determined by backtracking from an arbitrary position, or it must be (re-)started from the beginning?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">One possible implementation of a SyntaxDecorator would entail having a background process which gets triggered in SyntaxDecorator::createRichParagraph(model, index). Because
we don't want to hog the UI thread, it should return an unstyled RichParagraphs at first, and at the same it needs to trigger the syntax processing thread which runs from the beginning of the model. Whenever the syntax becomes available for the requested
paragraphs, the decorator invokes the StyledTextModel::fireStyleChangeEvent (in the FX Application thread), which updates the view. Make sure the model supports concurrent read.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Depending on the nature of the data, a number of optimizations can be made. For example, if the data has a regular structure where one does not have to restart from the beginning
each time, then a synchronous implementation might work, assuming we don't need to backtrack too much to determine the syntax.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Hope this helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">-andy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">openjfx-dev <openjfx-dev-retn@openjdk.org> on behalf of PavelTurk <pavelturk2000@gmail.com><br>
<b>Date: </b>Thursday, April 24, 2025 at 11:19<br>
<b>To: </b>openjfx-dev@openjdk.org <openjfx-dev@openjdk.org><br>
<b>Subject: </b>What strategy would you recommend for styling large documents in CodeArea?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Suppose we have a very large file (1,000,000+ lines). For example, it could be an XML file or a Java class written by a beginner programmer :).<br>
The question is: how should we handle styling for such large files?<br>
<br>
The simplest solution is to apply styles to all lines at once. Another option is to implement lazy styling—only styling the lines that are about to be displayed (crucially, before they are shown).<br>
<br>
Could you please clarify if lazy styling is possible in CodeArea? If yes, which API should be used for this? Or, in such cases, is a different approach recommended?<br>
<br>
Best regards, Pavel<o:p></o:p></span></p>
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