ValueImage.java example

Explorer
errai-master
/*
 * Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.ui.client.widget;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.safehtml.shared.UriUtils;
import com.google.gwt.user.client.ui.HasValue;
import com.google.gwt.user.client.ui.Image;

/**
 * @author edewit@redhat.com
 */
public class ValueImage extends Image implements HasValue<String> {
  @Override
  public String getValue() {
    return getUrl();
  }

  @Override
  public void setValue(String value) {
    setValue(value, false);
  }

  @Override
  public void setValue(String value, boolean fireEvents) {
    String oldValue = getValue();
    setUrl(UriUtils.fromSafeConstant(value));
    if (fireEvents) {
      ValueChangeEvent.fireIfNotEqual(this, oldValue, value);
    }
  }

  @Override
  public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) {
    return addHandler(handler, ValueChangeEvent.getType());
  }
}