ValueMultiListBox.java 文件源码

public ValueMultiListBox(Renderer<T> renderer2, ProvidesKey<T> keyProvider2) {
    this.keyProvider = keyProvider2;
    this.renderer = renderer2;
    initWidget(new ListBox(true));
    getListBox().setVisibleItemCount(2);

    getListBox().addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            ListBox lb = getListBox();
            Collection<T> newValue = new ArrayList<T>();
            for (int i = 0; i < values.size(); i++) {
                if (lb.isItemSelected(i)) {
                    newValue.add(values.get(i));
                }
            }

            setValue(newValue, true);
        }
    });
}