Selecting a ListSelect Dynamically

Vaadin 6 / 7 / 8 Framework UI
1

Hi,
Is ther any way to get the selected Id’s and selecting the ListSelect programatically … other than the following way

package com.example;

import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import com.KeyValue;

public class ListSelect extends com.vaadin.ui.ListSelect {
	private Set<KeyValue<Integer, Object>> selectedList;

	public ListSelect(List<KeyValue<Integer, Object>> list) {
		for (KeyValue<Integer, Object> key : list) {
			super.addItem(key);
		}
		setMultiSelect(true);
		selectedList = new HashSet<KeyValue<Integer, Object>>();
		addListener(ValueChangeEvent.class, this, "thisValueChanged");
		setImmediate(true);
	}

	@SuppressWarnings("unchecked")
	public final void thisValueChanged(ValueChangeEvent event) {
		System.out.println("Entered");
		selectedList = (Set<KeyValue<Integer, Object>>) event.getProperty().getValue();
	}

	public Set<KeyValue<Integer, Object>> getSelectedValues() {
		return selectedList;
	}
	
	public void setSelectedValues(int[] ids) {
		Collection<KeyValue<Integer, Object>> c = (Collection<KeyValue<Integer, Object>>)getItemIds();
		Set<KeyValue<Integer, Object>> keyValueSet = new HashSet<KeyValue<Integer,Object>>();
		for(KeyValue<Integer, Object> kv : c) {
			for(int i : ids) {
				if(kv.getKey() == i) {
					keyValueSet.add(kv);
					break;					
				}
			}
		}
		setValue(keyValueSet);
	}
}
2

you should be able to use getValue and setValue more directly.

  • setiing the value:

setValue(Arrays.asList<KeyValue<Integer, Object>>(ids)); should work

  • getting the value:

(Set<KeyValue<Integer, Object>>)getValue(); I don’t see the need of having a internal list of the values, or having the valuechangelistener. Just call getValue when you need the values.

Also, this doesn’t change anything but makes it a little neater, you should be able to change

for (KeyValue<Integer, Object> key : list) {
  super.addItem(key);
}
[/code] to [code]
super(null, list);