Die Anleitung zu JavaFX TreeView

1- JavaFX TreeView

Mit JavaFX TreeView können Sie ein Baumstruktur erstellen mit ein Stammelement (Root).

2- Das Beispiel über JavaFX TreeView

Beispiel unten über Erstellung eines TreeView mit einer Stammelement (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;
    }

}
zum Beispiel

3- TreeView mit vielen Hauptelemente

Achtung: TreeView darf viele Root Item nicht haben, Aber können Sie die Root Item verstecken und seine Tochter Elemente werden wie Root Item angezeigt.
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

Mit JavaFX dürfen Sie die Daten auf dem Baum (Tree) anpassen, Bei der Zelle der Baum können Sie einer der folgenden Tree Cell Editors
  • CheckBoxTreeCell
  • ChoiceBoxTreeCell
  • ComboBoxTreeCell
  • TextFieldTreeCell
Die oben Class werden aus class TreeCell verweitert, um die Steuerungskomponent (Controls) innerhalb einer Zelle des Baum auszuführen (render) wenn der Benutzer die Daten in Zelle bearbeitet

TreeView mit CheckBox

Das unten Beispiel zeigt die Erstellung eines TreeView mit Che ckBoxTreeItem. Sie sollen Cell Factory für treeView durch die Methode  setCellFactory setzen. Mit Cell factory wird die Schnittstelle der Zelle von Baum gemacht.
Mit 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());
Beispiel
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 mit 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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