Find the element of list, table cell, node of the tree, or control by location

One of my favorite on the swing features has the opportunity to get a reference to the component UI via Container.getComponentAt (int x, int y), or a particular list item through JList.locationToIndex (Point p) (or other similar methods). I was not able to find the same or similar functionality in JFX so far... anyone can point me in the right direction?

Thank you!

I don't know a way. When I started with JavaFX I had the same issue; However, I found that I actually need to do. Swing I ever need it when I was, say, treatment the mouse clicks on a JList. In JavaFX, you can register handlers with the cells directly. This does not work in the swing (in the least, not without a huge amount of effort). As well as in the swing, how to map a mouse click to a JList to the list item corresponding was to register a listener with the JList and then move the mouse click coordinates to locationToIndex (...), in JavaFX you just save the listener with the cell:

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ListTest extends Application {

  @Override
  public void start(Stage primaryStage) throws Exception {
    BorderPane root = new BorderPane();
    ListView listView = new ListView();
    listView.getItems().addAll("Apples", "Oranges", "Grapefruit", "Bananas");
    listView.setCellFactory(new Callback, ListCell>() {
      @Override
      public ListCell call(ListView param) {
        return new CustomListCell();
      }
    });
    root.setCenter(listView);
    Scene scene = new Scene(root, 300, 300);
    primaryStage.setScene(scene);
    primaryStage.show();
  }

  private class CustomListCell extends ListCell {
    private final EventHandler listener = new EventHandler() {
      @Override
      public void handle(MouseEvent event) {
        System.out.printf("Mouse clicked on list cell with %s (item number %d)",getItem(), getIndex());
        if (isEmpty()) {
          System.out.print(" (Empty cell)");
        }
        System.out.println();
      }
    };
    private CustomListCell() {
      this.addEventHandler(MouseEvent.MOUSE_CLICKED, listener);
    }
    @Override
    public void updateItem(String item , boolean empty) {
      super.updateItem(item, empty);
      if (! empty) {
        setText(item);
      } else {
        setText(null);
      }
    }
  }

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

}

Of course, maybe it's not your use case, and you really need this feature. Someone else can have a more direct response...

Tags: Java

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