List2List transfer from one list to another / first steps

    public static void testListeAListe(){
        String[] laListeSource = new String[5];
        laListeSource[0] = "Pharmacie";
        laListeSource[1] = "Médecine";
        laListeSource[2] = "Osthéopathie";
        laListeSource[3] = "Dentiste";
        laListeSource[4] = "Prothèse";
        ListeAListe lesListes = new ListeAListe(laListeSource,null,"Rubriques","Panier",300);
        lesListes.draw();
    }

public class ListeAListe extends HLayout {
    private final ListGrid source;
    private final ListGrid destination;
    private RecordList sourceList;
    private RecordList destinationList;
    private String titreSource;
    private String titreDestination;
    private ListeAListe moimeme;
    private DataSource sourceDS;
    private DataSource destinationDS;

    public ListeAListe(String[] sourceRecords, String[] destinationRecords,
        String titreSource, String titreDestination, int hauteur) {
        super();
        this.moimeme = this;
        sourceDS = new DataSource();
        DataSourceField valeurSource = new DataSourceField("valeur", FieldType.TEXT); 
        valeurSource.setPrimaryKey(true);
        valeurSource.setTitle(titreSource);
        sourceDS.setFields(valeurSource);
        sourceDS.setClientOnly(true);
        destinationDS = new DataSource();
        DataSourceField valeurDestination = new DataSourceField("valeur", FieldType.TEXT); 
        valeurDestination.setPrimaryKey(true);
        valeurDestination.setTitle(titreDestination);
        destinationDS.setFields(valeurDestination);
        destinationDS.setClientOnly(true);
        this.setWidth("500px");
        this.setHeight(hauteur);
        source = new ListGrid();       
        source.setWidth("35%");
        sourceList = new RecordList();
        for (String s: sourceRecords)
        {
            ListGridRecord r = new ListGridRecord();
            r.setAttribute("valeur",s);
            sourceList.add(r);
        }

        sourceDS.setTestData(sourceList.toArray());
        source.setDataSource(sourceDS);
        source.setAutoFetchData(true);
        source.setEmptyMessage("Liste vide");

        destination = new ListGrid();
        destination.setWidth("35%");
        destinationList = new RecordList();
        destinationDS.setTestData(destinationList.toArray());
        destination.setDataSource(destinationDS);
        destination.setAutoFetchData(true);
        destination.setEmptyMessage("Liste vide");


        VStack transferStack = new VStack(3); 
        transferStack.setWidth("30%"); 
        transferStack.setAlign(VerticalAlignment.CENTER);

        TransferImgButton right = new TransferImgButton(TransferImgButton.RIGHT);
        right.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                ListGridRecord selection = source.getSelectedRecord();
                if(selection != null){
                    if(!recordExistant(selection,destinationList)) {
                        sourceDS.removeData(selection);
                        destinationDS.addData(selection);    
                        destination.selectRecord(selection, false);
                    }
                }

            }
        });

        TransferImgButton left = new TransferImgButton(TransferImgButton.LEFT);
        left.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                ListGridRecord selection = destination.getSelectedRecord();
                if(selection != null){
                    if(!recordExistant(selection,sourceList)) {
                        destinationDS.removeData(selection);
                        sourceDS.addData(selection);   
                        source.selectRecord(selection, false);
                    }
                }

            }
        });

        TransferImgButton rightAll = new TransferImgButton(TransferImgButton.RIGHT_ALL);
        rightAll.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                source.selectAllRecords();
                ListGridRecord[] records = source.getSelection();
                for(Record record : records){
                    sourceDS.removeData(record);
                    destinationDS.addData(record); 
                    destination.selectRecord(record, false);
                }

            }
        });

        TransferImgButton leftAll = new TransferImgButton(TransferImgButton.LEFT_ALL);
        leftAll.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                destination.selectAllRecords();
                ListGridRecord[] records = destination.getSelection();
                for(Record record : records){
                    destinationDS.removeData(record);
                    sourceDS.addData(record); 
                    source.selectRecord(record, false);
                }

            }
        });

        transferStack.addMember(right);
        transferStack.addMember(left);
        transferStack.addMember(rightAll);
        transferStack.addMember(leftAll);

        this.addMember(source);
        this.addMember(transferStack);
        this.addMember(destination); 

    }

    protected boolean recordExistant(ListGridRecord selectedRecord, RecordList liste) {
        if(liste.contains(selectedRecord)){
            return true;
        }else{
            return false;
        }
    }
}