CODEWITHSUNDEEP
javafx-2
Matthias Meid
Matthias Meid

Reputation: 12523

Model-Identifier for Node in JavaFX 2 TreeItem

Is there a way to store an identifier of a model object or the model object itself in a JavaFX 2 TreeItem<String>? There is just Value to store the text...

I'm populating a TreeView from a list of model objects, and need to find it when the user clicks a node. I'm used to work with Value and Text in .NET Windows Forms or HTML and I am afraid I cannot adapt this way of thinking to JavaFX...

Upvotes: 1

Views: 3786

Answers (2)

Nigel Eke
Nigel Eke

Reputation: 531

I have the same issue as the OP. In addition I want to bind the value displayed in the TreeItem to a property of the object. This isn't complete, but I'm experimenting with the following helper class, where I'm passing in the "user object" (or item) to be referenced in the TreeItem, and a valueProperty (which, in my case, is a property of the item) to be bound to the TreeItem.value.

final class BoundTreeItem<B, T> extends TreeItem<T> {
  public BoundTreeItem(B item, Property<T> valueProperty) {
    this(item, valueProperty, null);
  }

  public BoundTreeItem(B item, Property<T> valueProperty, Node graphic) {
    super(null, graphic);
    itemProperty.set(item);
    this.valueProperty().bindBidirectional(valueProperty);
  }

  public ObjectProperty<B> itemProperty() {
    return itemProperty;
  }

  public B getItem() {
    return itemProperty.get();
  }

  private ObjectProperty<B> itemProperty = new SimpleObjectProperty<>();
}

Upvotes: 1

Sergey Grinev
Sergey Grinev

Reputation: 34508

You can use any objects with TreeView, they just have to override toString() for presenting or extend javafx.scene.Node

E.g. for next class:

private static class MyObject {
    private final String value;
    public MyObject(String st) { value = st; }

    public String toString() { return "MyObject{" + "value=" + value + '}'; }
}

TreeView should be created next way:

TreeView<MyObject> treeView = new TreeView<MyObject>();
TreeItem<MyObject> treeRoot = new TreeItem<MyObject>(new MyObject("Root node"));
treeView.setRoot(treeRoot);

Upvotes: 5

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