org.rest.client.ui.html5.HTML5Progress.java Source code

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Here is the source code for org.rest.client.ui.html5.HTML5Progress.java

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/*******************************************************************************
 * Copyright 2012 Pawe Pszty
 * 
 * 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.rest.client.ui.html5;

import com.google.gwt.dom.client.Document;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
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.FocusWidget;
import com.google.gwt.user.client.ui.HasValue;

@SuppressWarnings("javadoc")
public class HTML5Progress extends FocusWidget implements HasValue<Integer>, HasValueChangeHandlers<Integer> {

    private boolean valueChangeHandlerInitialized = false;

    public HTML5Progress() {
        super(Document.get().createElement("progress"));
        setStyleName("gwt-HTML5Progress");
    }

    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        return addDomHandler(handler, ChangeEvent.getType());
    }

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<Integer> handler) {
        if (!valueChangeHandlerInitialized) {
            valueChangeHandlerInitialized = true;
            addChangeHandler(new ChangeHandler() {
                public void onChange(ChangeEvent event) {
                    ValueChangeEvent.fire(HTML5Progress.this, getValue());
                }
            });
        }
        return addHandler(handler, ValueChangeEvent.getType());
    }

    @Override
    public Integer getValue() {
        String value = getElement().getAttribute("value");
        if (value == null || value.equals("")) {
            return null;
        }
        return Integer.parseInt(value);
    }

    @Override
    public void setValue(Integer value) {
        getElement().setAttribute("value", String.valueOf(value));
    }

    @Override
    public void setValue(Integer value, boolean fireEvents) {
        Integer oldValue = getValue();
        getElement().setAttribute("value", String.valueOf(value));
        if (fireEvents) {
            ValueChangeEvent.fireIfNotEqual(this, oldValue, value);
        }
    }

    /**
     * Sets max value attribute.
     * 
     * @param max
     * @throws IllegalArgumentException
     *             if value is null
     */
    public void setMax(Integer max) throws IllegalArgumentException {
        if (max == null) {
            throw new IllegalArgumentException("MAX must to have value.");
        }
        getElement().setAttribute("max", String.valueOf(max));
    }

    /**
     * Get max value attribute.
     * 
     * @return max attribute or null if not set
     */
    public Integer getMax() {
        String max = getElement().getAttribute("max");
        if (max == null || max.equals("")) {
            return null;
        }
        return Integer.parseInt(max);
    }
}