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  1. JDK
  2. JDK-8202066

ListView with large number of rows is extremly slow when changing current multiple selection to a subset

    Details

    • Subcomponent:
    • Introduced In Build:
      b115
    • Introduced In Version:
      9
    • CPU:
      x86_64
    • OS:
      generic

      Description

      A DESCRIPTION OF THE PROBLEM :
      When having a lot of data and playing with multiple selection there are situations where it could get very very slow, even though in Java8 it was not. In my case I need to have a lot of data in a ListView (~50k), and when I do stuff like first selecting all items, and then shift+clicking to have only a subset selected, it can take a good couple of minutes before finishing, making the program unusable during that time.

      It happens with Java9 as well.

      REGRESSION : Last worked in version 8u161

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1) Prepare a list view with a lot of items (the bigger the list, the easier to notice the issue) for example 50_000
      2) perfrom ctrl+a on a list to select all it's items
      3) while having all items selected, do shift+click on one of the items to reduce the selection (for example click on the 3rd item on the list)

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      selection should change to first 3 items only almost instantly
      ACTUAL -
      selection takes a couple of minutes, making the whole program unreponsive during that time

      ---------- BEGIN SOURCE ----------
      public class StringPlayground2 extends Application {

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

      @Override
      public void start(Stage primaryStage) {
      int ELEMENTS = 55_000;
      List<String> stringList = new ArrayList<>(ELEMENTS);

      for (int i = 0; i < ELEMENTS; i++) {
      stringList.add("" + i);
      }

      ListView<String> listView = new ListView<>(FXCollections.observableArrayList(stringList));
      listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

      // listView.getSelectionModel().getSelectedItems()
      // .addListener((ListChangeListener) c -> System.out.println(c.getList().size()));

      primaryStage.setScene(new Scene(listView, 640, 480));
      primaryStage.show();
      }
      }
      ---------- END SOURCE ----------

      FREQUENCY : always


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              • Assignee:
                Unassigned
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated: