I created a form with a dropdown which displays integer values 1....n. This is bound to two bean properties using beansbinding:
elements: MyBean.choices
selectedItem: MyBean.selected
MyBean {
private List<Integer> choices;
private Integer selected;
This works fine. I'm wondering how to implement adding new choices though. My setChoices() looks like:
public void setChoices(List<Integer> choices) {
List<Integer> old = this. choices;
this. choices = choices;
firePropertyChange("choices", old, choices);
System.out.println("fired change: " + old + ", " + choices);
}
and the method which adds a new choice:
public void addChoice() {
System.out.println("adding loadchoice");
List<Integer> newChoices = new ArrayList<Integer>(getChoices());
newChoices .add(newChoices .size() + 1);
setLoadNumberChoices(newChoices );
}
This works too....I am wondering however if this is the easiest way. It seems like a lot of work to create a new copy of the List each time one item is modified, especially since Lists can contain much more complex objects than Integers. Isn't there a way to just add a new choice to the original List and have beansbinding notice this change?
Tried like this but results is an empty dropdown for some reason:
public void addChoice() {
System.out.println("adding choice");
choices.add(choices.size() + 1);
setChoices(choices);
}
