import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
public StudentChooserPresenter(GwtPreferences preferences) {
    this.preferences = preferences;
    initWidget(uiBinder.createAndBindUi(this));
    TextCell textCell = new TextCell();
    studentList = new CellList<String>(textCell);
    selectionModel = new MultiSelectionModel<>();
    studentList.addCellPreviewHandler(new Handler<String>() {
        @Override
        public void onCellPreview(CellPreviewEvent<String> event) {
            if (BrowserEvents.CLICK.equals(event.getNativeEvent().getType())) {
                boolean isSelected = selectionModel.isSelected(event.getValue());
                selectionModel.setSelected(event.getValue(), ! isSelected);
                event.setCanceled(true);
            }
        }
    });
    DefaultSelectionEventManager<String> selectionManager =
            DefaultSelectionEventManager.createCheckboxManager();
    studentList.setSelectionModel(selectionModel, selectionManager);
    studentPanel.add(studentList);
    studentList.setRowData(preferences.getStudentNames());
    setListBoxValue(
            wordLength,
            preferences.getUltraghostMinimumWordLength());
    setListBoxValue(
            vocabularySize,
            preferences.getComputerStudentVocabularySize());
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addCellPreviewHandler( final Handler<T> handler ) {
    return dataGrid.addCellPreviewHandler( handler );
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addRangeChangeHandler( final RangeChangeEvent.Handler handler ) {
    return dataGrid.addRangeChangeHandler( handler );
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addRowCountChangeHandler( final RowCountChangeEvent.Handler handler ) {
    return dataGrid.addRowCountChangeHandler( handler );
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
public void setSelectionModel( final SelectionModel<? super T> selectionModel,
                               final CellPreviewEvent.Handler<T> selectionEventManager ) {
    dataGrid.setSelectionModel( selectionModel,
                                selectionEventManager );
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addCellPreviewHandler(Handler<T> handler) {

    return this.addCellPreviewHandler(handler);
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addCellPreviewHandler(Handler<C> handler) {
  return presenter.addCellPreviewHandler(handler);
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addRangeChangeHandler(RangeChangeEvent.Handler handler) {
  return presenter.addRangeChangeHandler(handler);
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
@Override
public HandlerRegistration addRowCountChangeHandler(RowCountChangeEvent.Handler handler) {
  return presenter.addRowCountChangeHandler(handler);
}
 

import com.google.gwt.view.client.CellPreviewEvent.Handler; //导入依赖的package包/类
/**
 * Link a column sort handler to the table
 * @param handler
 */
public HandlerRegistration addColumnSortHandler( final ColumnSortEvent.Handler handler ) {
    return this.dataGrid.addColumnSortHandler( handler );
}