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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 <openjfx-dev-retn@openjdk.org> on behalf of PavelTurk <pavelturk2000@gmail.com><br>
<b>Date: </b>Wednesday, April 30, 2025 at 04:14<br>
<b>To: </b>openjfx-dev@openjdk.org <openjfx-dev@openjdk.org><br>
<b>Subject: </b>CodeArea: too frequent model updates<o:p></o:p></span></p>
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<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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