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JavaFX TreeView Tutorial with Examples

  1. JavaFX TreeView
  2. JavaFX TreeView example
  3. TreeView with multiple root items
  4. Tree Cell Editors

1. JavaFX TreeView

JavaFX TreeView allows you to create a tree structure with a root item.

2. JavaFX TreeView example

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Example below illustrates the creation of a TreeView with a Root Item.
TreeViewDemo.java
package org.o7planning.javafx.treeview;

import org.o7planning.javafx.model.BookCategory;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class TreeViewDemo extends Application {

    @Override
    public void start(Stage primaryStage) {

        BookCategory catJava = new BookCategory("JAVA-00", "Java");
        BookCategory catJSP = new BookCategory("JAVA-01", "Jsp");
        BookCategory catSpring = new BookCategory("JAVA-02", "Spring");

        // Root Item
        TreeItem<BookCategory> rootItem = new TreeItem<BookCategory>(catJava);
        rootItem.setExpanded(true);

        // JSP Item
        TreeItem<BookCategory> itemJSP = new TreeItem<BookCategory>(catJSP);

        // Spring Item
        TreeItem<BookCategory> itemSpring = new TreeItem<>(catSpring);

        // Add to Root
        rootItem.getChildren().addAll(itemJSP, itemSpring);

        TreeView<BookCategory> tree = new TreeView<BookCategory>(rootItem);

        StackPane root = new StackPane();
        root.setPadding(new Insets(5));
        root.getChildren().add(tree);

        primaryStage.setTitle("JavaFX TreeView (o7planning.org)");
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
}
BookCategory.java
package org.o7planning.javafx.model;

public class BookCategory {

    private String code;
    private String name;

    public BookCategory() {

    }

    public BookCategory(String code, String name) {
        this.code = code;
        this.name = name;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
   
    @Override
    public String toString()  {
        return this.name;
    }

}
Running the example:

3. TreeView with multiple root items

Note that TreeView is not allowed to contain multiple Root Items but you can hide the root Item and their children will have a display as if they were the root Items of tree.
TreeViewMultiRootDemo.java
package org.o7planning.javafx.treeview;

import org.o7planning.javafx.model.BookCategory;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class TreeViewMultiRootDemo extends Application {

   @Override
   public void start(Stage primaryStage) {

       BookCategory catRoot = new BookCategory("ROOT", "Root");
       // Java
       BookCategory catJava = new BookCategory("JAVA-00", "Java");
       BookCategory catJSP = new BookCategory("JAVA-01", "Jsp");
       BookCategory catSpring = new BookCategory("JAVA-02", "Spring");
       // C#
       BookCategory catCSharp = new BookCategory("C#-00", "CSharp");
       BookCategory catWinForm = new BookCategory("C#-01", "Win Form");

       // Root Item
       TreeItem<BookCategory> rootItem = new TreeItem<BookCategory>(catRoot);
       rootItem.setExpanded(true);

       // Java
       TreeItem<BookCategory> itemJava = new TreeItem<BookCategory>(catJava);
       TreeItem<BookCategory> itemJSP = new TreeItem<BookCategory>(catJSP);
       TreeItem<BookCategory> itemSpring = new TreeItem<BookCategory>(catSpring);
       itemJava.getChildren().addAll(itemJSP, itemSpring);
     
       // CSharp
       TreeItem<BookCategory> itemCSharp = new TreeItem<BookCategory>(catCSharp);
       TreeItem<BookCategory> itemWinForm = new TreeItem<BookCategory>(catWinForm);
       itemCSharp.getChildren().addAll(itemWinForm);
     
       // Add to Root
       rootItem.getChildren().addAll(itemJava,itemCSharp);
     

       TreeView<BookCategory> tree = new TreeView<BookCategory>(rootItem);
     
       // Hide the root Item.
       tree.setShowRoot(false);
     
       StackPane root = new StackPane();
       root.setPadding(new Insets(5));
       root.getChildren().add(tree);

       primaryStage.setTitle("JavaFX TreeView (o7planning.org)");
       primaryStage.setScene(new Scene(root, 300, 250));
       primaryStage.show();
   }

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

4. Tree Cell Editors

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JavaFX allows you to edit the data on tree, and in the cells of tree you can use one of Tree Cell Editors as follows:
  • CheckBoxTreeCell
  • ChoiceBoxTreeCell
  • ComboBoxTreeCell
  • TextFieldTreeCell
There classes extend the TreeCell implementation to render a particular control inside the cell when user editing the cell.
TreeView with CheckBox
Example below illustrates the creation of a TreeView with CheckBoxTreeItems. You need to set up Cell Factory for treeView via setCellFactory method. Cell factory is used to draw the interface at the cell of tree.
With CheckBox:
treeView.setCellFactory(new Callback<TreeView<Layer>, TreeCell<Layer>>() {

   @Override
   public TreeCell<Layer> call(TreeView<Layer> param) {

       return new CheckBoxTreeCell<Layer>();
   }
});

// Or:

treeView.setCellFactory( CheckBoxTreeCell.<Layer> forTreeView());
View full example:
TreeViewCheckBoxDemo.java
package org.o7planning.javafx.treeview;

import org.o7planning.javafx.model.BookCategory;
import org.o7planning.javafx.model.Layer;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.CheckBoxTreeItem;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.CheckBoxTreeCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TreeViewCheckBoxDemo extends Application {

    @Override
    public void start(Stage primaryStage) {

        Layer layer0 = new Layer("Layers", false);

        Layer layer1 = new Layer("Wet Area", false);
        Layer layer2 = new Layer("Titles", true);
        Layer layer3 = new Layer("Logos", true);

        // Root Item
        TreeItem<Layer> rootItem = new TreeItem<Layer>(layer0);
        rootItem.setExpanded(true);

        // Item 1
        CheckBoxTreeItem<Layer> item1 = new CheckBoxTreeItem<Layer>(layer1);
        item1.setSelected(layer1.isSelected());

        // Item 2
        CheckBoxTreeItem<Layer> item2 = new CheckBoxTreeItem<Layer>(layer2);
        item1.setSelected(layer2.isSelected());

        // Item 3
        CheckBoxTreeItem<Layer> item3 = new CheckBoxTreeItem<Layer>(layer3);
        item1.setSelected(layer3.isSelected());

        // Add to Root
        rootItem.getChildren().addAll(item1, item2, item3);

        TreeView<Layer> treeView = new TreeView<Layer>(rootItem);

        // Set Cell Factory. 

        treeView.setCellFactory(new Callback<TreeView<Layer>, TreeCell<Layer>>() {

            @Override
            public TreeCell<Layer> call(TreeView<Layer> param) {

                return new CheckBoxTreeCell<Layer>();
            }
        });

        StackPane root = new StackPane();
        root.setPadding(new Insets(5));
        root.getChildren().add(treeView);

        primaryStage.setTitle("JavaFX TreeView (o7planning.org)");
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }

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

}
Layer.java
package org.o7planning.javafx.model;

public class Layer {

    private String layerName;
    private boolean selected;

    public Layer() {

    }

    public Layer(String layerName, boolean selected) {
        this.layerName = layerName;
        this.selected = selected;
    }

    public String getLayerName() {
        return layerName;
    }

    public void setLayerName(String layerName) {
        this.layerName = layerName;
    }

    public boolean isSelected() {
        return selected;
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

    @Override
    public String toString() {
        return this.layerName;
    }

}
TreeView with ChoiceBox
TreeViewChoiceBoxDemo.java
package org.o7planning.javafx.treeview;

import org.o7planning.javafx.model.XmlTag;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.ChoiceBoxTreeCell;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TreeViewChoiceBoxDemo extends Application {

  @Override
  public void start(Stage primaryStage) {

      XmlTag tag0 = new XmlTag("div");
      XmlTag tag1 = new XmlTag("span");
      XmlTag tag2 = new XmlTag("font");
      XmlTag tag21 = new XmlTag("font");
      XmlTag tag3 = new XmlTag("color");

      // Root Item
      TreeItem<XmlTag> rootItem = new TreeItem<XmlTag>(tag0);
      rootItem.setExpanded(true);

      // Item 1
      TreeItem<XmlTag> item1 = new TreeItem<XmlTag>(tag1);

      // Item 2
      TreeItem<XmlTag> item2 = new TreeItem<XmlTag>(tag2);

      // Item 2.1
      TreeItem<XmlTag> item21 = new TreeItem<XmlTag>(tag21);
      item2.getChildren().add(item21);
      item2.setExpanded(true);

      // Add to Root
      rootItem.getChildren().addAll(item1, item2);

      TextArea textArea = new TextArea();

      TreeView<XmlTag> treeView = new TreeView<XmlTag>(rootItem);
      treeView.setMaxHeight(180);
      treeView.setEditable(true);

      // Set Cell Factory.
      // treeView.setCellFactory( ChoiceBoxTreeCell.<XmlTag> forTreeView());

      treeView.setCellFactory(new Callback<TreeView<XmlTag>, TreeCell<XmlTag>>() {

          @Override
          public TreeCell<XmlTag> call(TreeView<XmlTag> param) {
              // ChoiceBox with 3 option.
              return new ChoiceBoxTreeCell<XmlTag>(tag1, tag2, tag3);
          }
      });

      // Add event handler to item2, it also affects the child items.

      item2.addEventHandler(TreeItem.<XmlTag> valueChangedEvent(),
              new EventHandler<TreeItem.TreeModificationEvent<XmlTag>>() {

                  @Override
                  public void handle(TreeItem.TreeModificationEvent<XmlTag> event) {

                      textArea.appendText("Change to: " + event.getTreeItem().getValue().getTagName() + "\n");
                  }

              });
      // Button
      Button button = new Button("Print Info");
   
      button.setOnAction(new EventHandler<ActionEvent>() {

          @Override
          public void handle(ActionEvent event) {
              textArea.setText(null);
                textArea.appendText("Item0: "+ rootItem.getValue().getTagName());
                textArea.appendText("\nItem1: "+ item1.getValue().getTagName());
              textArea.appendText("\nItem2: "+ item2.getValue().getTagName());
              textArea.appendText("\nItem21: "+ item21.getValue().getTagName());
          }
      });
   
   
      VBox root = new VBox();
      root.setPadding(new Insets(5));
      root.setSpacing(5);
      root.getChildren().addAll(treeView, textArea,button);

      primaryStage.setTitle("JavaFX TreeView (o7planning.org)");
      primaryStage.setScene(new Scene(root, 450, 300));
      primaryStage.show();
  }

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

}
XmlTag.java
package org.o7planning.javafx.model;

public class XmlTag {

    private String tagName;

    public XmlTag() {

    }

    public XmlTag(String tagName) {
        this.tagName = tagName;
    }

    public String getTagName() {
        return tagName;
    }

    public void setTagName(String tagName) {
        this.tagName = tagName;
    }

    @Override
    public String toString() {
        return "<"+this.tagName+">";
    }
   
}
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