TreeView with icons displayed incorrectly after expansion (8 JavaFX)

I have a TreeView with classes CellFactory and TreeCell custom, which has been implemented in JavaFX 2.2 and works perfectly. However, after I upgraded to 8 JavaFX. This tree is completely messed up. If I develop a nodes, there will be duplicate tree nodes in the tree. Here is a simplified version of the source code. If not use a method setGraphic() in class TreeCell, it works fine.

package test;


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;


public class TreeViewTest extends Application {
    private static final Image image = new Image(TreeViewTest.class.getResourceAsStream("icon_datasource.png"));
    
    public TreeViewTest() {
    }


    @Override
    public void start(Stage primaryStage) {
        BorderPane rootPane = new BorderPane();


        TreeItem<String> root = new TreeItem<String>("Root");
        
        for (int i = 0; i < 5; i++) {
            TreeItem<String> ds = new TreeItem<String>("Datasource " + i);
            
            for (int t = 0; t < 5; t++) {
        TreeItem<String> tb = new TreeItem<String>("Table " + t);
        ds.getChildren().add(tb);
            }
            
            root.getChildren().add(ds);
        }
        
        TreeView<String> tree = new TreeView<String>();
        tree.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
     
     public TreeCell<String> call(TreeView<String> param) {
  return new TreeCell<String>() {
     @Override
     protected void updateItem(String item, boolean empty) {
         super.updateItem(item, empty);
         
         if (!empty) {
             ImageView imageView = new ImageView(image);
             setText(item);
             setGraphic(imageView);
         }
     }
  };
     }
  });
        tree.setRoot(root);
        tree.setShowRoot(false);
        
        rootPane.setLeft(tree);
        
        Scene scene = new Scene(rootPane, 1024, 800);


        primaryStage.setTitle("Test");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

In general, cells are reused as items in TreeView (and some make, and ListViews) as soon as they become visible and invisible. It is perfectly possible for a cell to have an element that is not empty and then it change to empty, as the cell is reused for an empty cell.

If you have a bug in your code: you need

tree.setCellFactory(new Callback, TreeCell>() {

            public TreeCell call(TreeView param) {
                return new TreeCell() {
                    @Override
                    protected void updateItem(String item, boolean empty) {
                        super.updateItem(item, empty);

                        if (!empty) {
                            ImageView imageView = new ImageView(image);
                            setText(item);
                            setGraphic(imageView);
                        } else {
                            setText(null);
                            setGraphic(null);
                        }
                    }
                };
            }
        });

You lucky in JavaFX2.2 that the re-use of cell does not seem to affect your bug. improving the effectiveness of the re-use of the cell in JavaFX 8 has exposed the problem.

Furthermore, it is generally a bit pointless to re - create the nodes each time than updateItem (...) is called (frequently), rather than create them once when the cell is created (much less often). So consider

tree.setCellFactory(new Callback, TreeCell>() {

            public TreeCell call(TreeView param) {
                return new TreeCell() {
                    private ImageView imageView = new ImageView(image);
                    @Override
                    protected void updateItem(String item, boolean empty) {
                        super.updateItem(item, empty);

                        if (!empty) {
                            setText(item);
                            setGraphic(imageView);
                        } else {
                            setText(null);
                            setGraphic(null);
                        }
                    }
                };
            }
        });

Instead

Tags: Java

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