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  1. JDK
  2. JDK-8129582

Controls slow considerably when displaying RTL-languages text on Linux

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    • Subcomponent:
    • CPU:
      x86_64
    • OS:
      linux

      Description

      FULL PRODUCT VERSION :
      openjdk version "1.8.0_45-internal"
      OpenJDK Runtime Environment (build 1.8.0_45-internal-b14)
      OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1 (2015-05-24) x86_64 GNU/Linux

      A DESCRIPTION OF THE PROBLEM :
      JavaFX controls will slow down considerably when displaying text in RTL languages such as Arabic or Hebrew. This is _not_ an issue with NodeOrientation, only with the actual language text.

      Same code with text in English or other non-latin languages (Such as Japanese or Russian for example) work fine.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1. Create a ComboBox (this is probably happening in other controls too, but is most notable in a ComboBox).
      2. Add >10 items with text in either Hebrew or Arabic.
      3. Try to scroll through the items in the ComboBox.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Opening the ComboBox and scrolling through it should be as fast as when the strings inside are in any other language.
      ACTUAL -
      Opening and scrolling through items is extremely slow and laggy.

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import javafx.application.Application;
      import javafx.scene.Scene;
      import javafx.scene.control.ComboBox;
      import javafx.scene.layout.Pane;
      import javafx.stage.Stage;



      public class MainApp extends Application{

      public static void main(String[] args) {
      launch(args);

      }

      @Override
      public void start(Stage mainStage) throws Exception {
      Pane p = new Pane();
      ComboBox<String> cb = new ComboBox<String>();
      for (int i=0; i<30; i++)
      {
      cb.getItems().add("שלום");
      }
      p.getChildren().add(cb);

      Scene s = new Scene(p);

      mainStage.setScene(s);
      mainStage.show();

      }

      }

      ---------- END SOURCE ----------

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            • Assignee:
              prr Philip Race
              Reporter:
              webbuggrp Webbug Group
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              Dates

              • Created:
                Updated:
                Resolved: