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Hello, Andy<br>
<br>
I've made sure to formulate everything very precisely and just
created a new issue. Unfortunately I know only its ID: 9078451.<br>
<br>
If my proposal is incorrect - then this issue is not meant to be
resolved. However, I'm certain this is an important question
regardless.<br>
<br>
Best regards, Pavel<br>
<br>
<div class="moz-cite-prefix">On 4/30/25 17:45, Andy Goryachev wrote:<br>
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<blockquote type="cite"
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Dear
Pavel:<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"">As I
mentioned before, the view might request more paragraphs
than currently visible, so it works as designed.<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"">When
you say it's slow, could you tell what metric / measurement
you used? The attached code does not appear slow on my
macOS. Would you provide a reproducer which can illustrate
the issue?<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"">Thanks<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
<a class="moz-txt-link-rfc2396E" href="mailto:openjfx-dev-retn@openjdk.org"><openjfx-dev-retn@openjdk.org></a> on behalf of
PavelTurk <a class="moz-txt-link-rfc2396E" href="mailto:pavelturk2000@gmail.com"><pavelturk2000@gmail.com></a><br>
<b>Date: </b>Wednesday, April 30, 2025 at 04:14<br>
<b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:openjfx-dev@openjdk.org">openjfx-dev@openjdk.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:openjfx-dev@openjdk.org"><openjfx-dev@openjdk.org></a><br>
<b>Subject: </b>CodeArea: too frequent model
updates<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:11.0pt">Trying
to understand why my Jfx CodeArea works so slowly I
wrote a test application (see below).<br>
And I got interesting results. If you start the
application you will see that about 10 paragraphs<br>
are visible.<br>
<br>
1. If after start you click on the report button you
will see that about 113 paragraphs were created
(remember 10 visible).<br>
2. If you click event button (as I understand to
update only 15 paragraphs - I can be wrong here) in
the report you will see 112 paragraphs.<br>
3. If you scroll to line 100, click report to clear,
add one letter via keyboard and in the new report
you will see 210 paragraphs were updated.<br>
So, with one paragraph modified and 10 paragraphs
visible CodeArea updates 210 paragraphs.<br>
<br>
I see two solutions here:<br>
1) If Jfx CodeArea wants to update paragraphs itself
it should be optimized<br>
2) A better solution is to remove final modifier
from CodeTextModel.getParagraph(int index) method so
that we could override it.<br>
<br>
public class JfxTextArea extends Application {<br>
<br>
@Override<br>
public void start(Stage primaryStage) throws
Exception {<br>
CodeArea codeArea = new CodeArea();<br>
codeArea.setLineNumbersEnabled(true);<br>
final List<Integer> requestedIndexes
= new ArrayList<>();<br>
codeArea.setSyntaxDecorator(new
SyntaxDecorator() {<br>
@Override<br>
public RichParagraph
createRichParagraph(CodeTextModel ctm, int i) {<br>
requestedIndexes.add(i);<br>
RichParagraph.Builder b =
RichParagraph.builder();<br>
b.addSegment(ctm.getPlainText(i));<br>
return b.build();<br>
}<br>
<br>
@Override<br>
public void handleChange(CodeTextModel
ctm, TextPos tp, TextPos tp1, int i, int i1, int i2)
{<br>
<br>
}<br>
});<br>
StringBuilder sb = new StringBuilder();<br>
for (var i = 0; i < 1000; i++) {<br>
sb.append(i);<br>
sb.append("\n");<br>
}<br>
codeArea.setText(sb.toString());<br>
<br>
var reportButton = new Button("Report &
Clear");<br>
reportButton.setOnAction(e -> {<br>
Collections.sort(requestedIndexes);<br>
System.out.println("Created/Updated " +
requestedIndexes.size() + " paragraphs: " +
requestedIndexes);<br>
requestedIndexes.clear();<br>
});<br>
var topButton = new Button("To Top");<br>
topButton.setOnAction(e ->
codeArea.select(new TextPos(0, 0, 0, true)));<br>
var bottomButton = new Button("To Bottom");<br>
bottomButton.setOnAction(e ->
codeArea.select(new TextPos(999, 0, 0, true)));<br>
var eventButton = new Button("Fire Event");<br>
eventButton.setOnAction(e ->
codeArea.getModel()<br>
.fireStyleChangeEvent(new
TextPos(0, 0, 0, true), new TextPos(15, 0, 0,
true)));<br>
HBox buttonBox = new HBox(reportButton,
topButton, bottomButton, eventButton);<br>
<br>
VBox.setVgrow(codeArea, Priority.ALWAYS);<br>
VBox root = new VBox(codeArea, buttonBox);<br>
Scene scene = new Scene(root, 600, 200);<br>
primaryStage.setScene(scene);<br>
primaryStage.show();<br>
<br>
}<br>
<br>
public static void main(String[] args) {<br>
launch(args);<br>
}<br>
<br>
}<br>
<br>
Best regards, Pavel<o:p></o:p></span></p>
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