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<a class="moz-txt-link-freetext" href="https://bugs.openjdk.org/browse/JDK-8355986">https://bugs.openjdk.org/browse/JDK-8355986</a><br>
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<div class="moz-cite-prefix">On 4/30/2025 9:05 AM, Andy Goryachev
wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Thank
you, Pavel, for filing the ticket (it will take some time
before it gets routed to me). And thank you so much for the
feedback - keep it going!<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
<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 08:54<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>Re: CodeArea: too frequent model
updates<o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt">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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">On
4/30/25 17:45, Andy Goryachev wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Dear
Pavel:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></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?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Thanks</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">-andy</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></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 href="mailto:openjfx-dev-retn@openjdk.org" moz-do-not-send="true">
<openjfx-dev-retn@openjdk.org></a>
on behalf of PavelTurk <a href="mailto:pavelturk2000@gmail.com" moz-do-not-send="true">
<pavelturk2000@gmail.com></a><br>
<b>Date: </b>Wednesday, April 30, 2025 at
04:14<br>
<b>To: </b><a href="mailto:openjfx-dev@openjdk.org" moz-do-not-send="true" class="moz-txt-link-freetext">openjfx-dev@openjdk.org</a>
<a href="mailto:openjfx-dev@openjdk.org" moz-do-not-send="true">
<openjfx-dev@openjdk.org></a><br>
<b>Subject: </b>CodeArea: too frequent
model updates</span><o:p></o:p></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</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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