JavaFX - How To Select A Specific Shape?

Question

Suppose I have the following two rectangles and I wanted to delete one:

I know how to implement the delete button method, however I do not know how I can select between the shapes through a mouse-click. Could someone please give me some guidelines/examples as to how I would go about this. Thanks

Edit - Where I construct the rectangle:

if (treeview.getSelectionModel().getSelectedItem() == greenrect) {
                Rectangle rect = drag.createDraggableRectangle(200, 60, 200, 60);
                ObjectProperty<Point2D> mousePosition = new SimpleObjectProperty<>();
                GraphicsContext gc = canvas.getGraphicsContext2D();
                rect.setFill(Color.GREEN);
                container2.getChildren().addAll(rect);
                }

Zoltanik · Accepted Answer · 2017-01-22 13:14:37Z

1

use the same event on both of the shapes like this:

private List<Shape> selectedShapes = new ArrayList<>();
@FXML
public void onShapeSelected(MouseEvent e) {
  Shape shape = (Shape) e.getSource();

  if (!selectedShapes.contains(shape)) {
    selectedShapes.add(shape);
  }
}

@FXML 
public void delete(ActionEvent e) {
   // delelte all the shapes from selected shapes list
}

What i did here is to save the selected nodes inside a list, and when the user will press delete you will be able to delete all the selected nodes. I'm also recommend you to add selected style to the selected shape for notice the user that he selected the Shape and when the user re-press on the shape you can remove the shape from the list (don't forget to also remove the selected style)

edited Jan 22, 2017 at 13:14

answered Jan 22, 2017 at 12:54

Zoltanik

1892 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

TheBeliever12 Over a year ago

Hey, thanks for your response. What would the "!selectedShapes" be??.. Thanks

Zoltanik Over a year ago

array list of shapes for example

TheBeliever12 Over a year ago

I see what your doing. That is great! could you please tell me how I could use the method for my rectangle?. I have added the code where I initialise the green rectangle. The code shows how I add the rectangle to my pane from a treelist. Thanks :D

Zoltanik Over a year ago

greenRect.setOnMouseClicked(e -> onShapeSelected(e)); If you're using java 8

TheBeliever12 Over a year ago

Fantastic! Worked a treat! :D

|

Collectives™ on Stack Overflow

JavaFX - How To Select A Specific Shape?

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related