[JavaFX] TreeView Examples

1. TreeView Node Addition Examples

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void initTree() { TreeItem<String> root = new TreeItem<> ("Root"); TreeItem<String> nodeA = new TreeItem<>("Item A"); TreeItem<String> nodeB = new TreeItem<>("Item B"); TreeItem<String> nodeC = new TreeItem<>("Item C"); root.getChildren().addAll(nodeA, nodeB, nodeC); root.setExpanded(true); TreeItem<String> nodeItemA1 = new TreeItem<>("Item A1"); TreeItem<String> nodeItemA2 = new TreeItem<>("Item A2"); TreeItem<String> nodeItemA3 = new TreeItem<>("Item A3"); nodeA.getChildren().add(nodeItemA1); nodeA.getChildren().add(nodeItemA2); nodeA.getChildren().add(nodeItemA3); nodeA.setExpanded(true); Image icon = new Image(getClass().getResourceAsStream("folder.png")); List<TreeItem<String>> nodeItemB = new ArrayList<>(); nodeItemB.add( new TreeItem<>("Item B1",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B2",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B3",new ImageView(icon))); nodeB.getChildren().addAll(nodeItemB); nodeB.setExpanded(true); treeView.setRoot(root); treeView.getSelectionModel().selectFirst(); treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem<String>>() { @Override public void changed(ObservableValue<? extends TreeItem<String>> observable, TreeItem<String> oldValue, TreeItem<String> newValue) { Alert alert = new Alert(AlertType.INFORMATION); alert.setTitle("JavaFXUtility"); alert.setHeaderText(null); alert.setContentText(String.format("selected=%s", newValue.getValue())); alert.showAndWait(); } }); }

Result:

2. Node Addition with Single Item

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TreeItem<String> nodeItemA1 = new TreeItem<>("Item A1"); TreeItem<String> nodeItemA2 = new TreeItem<>("Item A2"); TreeItem<String> nodeItemA3 = new TreeItem<>("Item A3"); nodeA.getChildren().add(nodeItemA1); nodeA.getChildren().add(nodeItemA2); nodeA.getChildren().add(nodeItemA3);

3. Node Addition with Multiple Items

1) Node Addition using variable function arguments

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TreeItem<String> nodeA = new TreeItem<>("Item A"); TreeItem<String> nodeB = new TreeItem<>("Item B"); TreeItem<String> nodeC = new TreeItem<>("Item C"); root.getChildren().addAll(nodeA, nodeB, nodeC);

2) Node Addition using List

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List<TreeItem<String>> nodeItemB = new ArrayList<>(); nodeItemB.add( new TreeItem<>("Item B1",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B2",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B3",new ImageView(icon))); nodeB.getChildren().addAll(nodeItemB);

4. Node Addition with Icon Image

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nodeItemB.add( new TreeItem<>("Item B1",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B2",new ImageView(icon))); nodeItemB.add( new TreeItem<>("Item B3",new ImageView(icon)));

5. Handling Node Click Event

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treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem<String>>() { @Override public void changed(ObservableValue<? extends TreeItem<String>> observable, TreeItem<String> oldValue, TreeItem<String> newValue) { Alert alert = new Alert(AlertType.INFORMATION); alert.setTitle("JavaFXUtility"); alert.setHeaderText(null); alert.setContentText(String.format("selected=%s", newValue.getValue())); alert.showAndWait(); } });