001/*
002 * #%L
003 * GwtMaterial
004 * %%
005 * Copyright (C) 2015 - 2017 GwtMaterialDesign
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.ui.table.cell;
021
022import com.google.gwt.cell.client.Cell.Context;
023import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
024import com.google.gwt.user.client.ui.Widget;
025
026/**
027 * A column that displays its contents with a {@link TextCell} and does not make
028 * use of view data.
029 *
030 * @param <T> the row type
031 * @author Ben Dol
032 */
033public abstract class WidgetColumn<T, C extends Widget> extends Column<T, C> {
034
035    static class BlankWidgetCell<T, C extends Widget> extends WidgetCell<T, C> {
036        @Override
037        public void render(Context context, T value, C widget) {}
038    }
039
040    public WidgetColumn() {
041        super(new BlankWidgetCell<T, C>());
042    }
043
044    public WidgetColumn(WidgetCell<T, C> cell) {
045      super(cell);
046    }
047
048    @Override
049    public void render(Context context, T object, SafeHtmlBuilder sb) {
050      throw new UnsupportedOperationException("Use WidgetColumn#render(context, object).");
051    }
052
053    public C render(Context context, T object) {
054      C widget = getValue(object);
055      ((WidgetCell<T,C>)getCell()).render(context, object, widget);
056      return widget;
057    }
058}