bikeshed/src/com/google/gwt/sample/expenses/client/CommandCell.java

/*
 * Copyright 2010 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.sample.expenses.client;

import com.google.gwt.bikeshed.cells.client.Cell;
import com.google.gwt.bikeshed.cells.client.ValueUpdater;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.user.client.Command;

/**
 * A Cell embedding a Command.
 */
public class CommandCell extends Cell<Command, Void> {
  
  private String message;

  public CommandCell(String message) {
    this.message = message;
  }
  
  @Override
  public Void onBrowserEvent(Element parent, Command value, Void viewData,
      NativeEvent event, ValueUpdater<Command, Void> valueUpdater) {
    if ("mouseup".equals(event.getType())) {
      if (valueUpdater != null) {
        valueUpdater.update(value, viewData);
      }
      value.execute();
    }

    return viewData;
  }

  @Override
  public void render(Command value, Void viewData, StringBuilder sb) {
    sb.append("<button>" + message + "</button>");
  }
}