org.cruxframework.crux.widgets.client.select.SingleSelect.java Source code

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Here is the source code for org.cruxframework.crux.widgets.client.select.SingleSelect.java

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/*
 * Copyright 2014 cruxframework.org.
 * 
 * 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.cruxframework.crux.widgets.client.select;

import org.cruxframework.crux.core.client.utils.StringUtils;
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.user.client.ui.HasValue;
import com.google.gwt.user.client.ui.ListBox;

/**
 * A simple single-select listBox that implements HasValue interface.
 * @author Gesse S. F. Dafe - <code>gessedafe@gmail.com</code>
    
 *
 */
//TODO refactorar isso. esse nome esta ruim
public class SingleSelect extends ListBox implements HasValue<String> {
    /**
     * @see com.google.gwt.user.client.ui.HasValue#getValue()
     */
    public String getValue() {
        if (getSelectedIndex() >= 0) {
            return getValue(getSelectedIndex());
        }

        return null;
    }

    /**
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object)
     */
    public void setValue(String value) {
        int count = getItemCount();

        for (int i = 0; i < count; i++) {
            String itemValue = getValue(i);

            if ((StringUtils.isEmpty(itemValue) && StringUtils.isEmpty(value)) || itemValue.equals(value)) {
                setSelectedIndex(i);
                break;
            }
        }
    }

    /**
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean)
     */
    public void setValue(String value, boolean fireEvents) {
        String oldValue = getValue();
        setValue(value);
        if (fireEvents) {
            ValueChangeEvent.fireIfNotEqual(this, oldValue, value);
        }
    }

    /**
     * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler)
     */
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) {
        return addHandler(handler, ValueChangeEvent.getType());
    }
}