org.jrydberg.ui.client.ToggleButton.java Source code

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Here is the source code for org.jrydberg.ui.client.ToggleButton.java

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/**
 * Copyright 2010 Johan Rydberg
 *
 * 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.jrydberg.ui.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.HasValue;

/**
 * @author jrydberg
 *
 */
public class ToggleButton extends Button implements HasValue<Boolean> {

    public interface Resources extends Button.Resources {

    }

    private final HandlerManager handlerManager = new HandlerManager(this);

    private static Resources DEFAULT_RESOURCES;

    private Resources resources;

    private boolean value;

    private static Resources getDefaultResources() {
        if (DEFAULT_RESOURCES == null) {
            DEFAULT_RESOURCES = GWT.<Resources>create(Resources.class);
        }
        return DEFAULT_RESOURCES;
    }

    public ToggleButton() {
        this(getDefaultResources());
    }

    public ToggleButton(Resources resources) {
        super(resources);
        this.resources = resources;

        addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                setValue(!value, true);
            }
        });
    }

    /* (non-Javadoc)
     * @see com.google.gwt.user.client.ui.HasValue#getValue()
     */
    @Override
    public Boolean getValue() {
        return value;
    }

    /* (non-Javadoc)
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object)
     */
    @Override
    public void setValue(Boolean value) {
        setValue(value, false);
    }

    /* (non-Javadoc)
     * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean)
     */
    @Override
    public void setValue(Boolean value, boolean fireEvents) {
        if (value.booleanValue()) {
            addStyleName(resources.buttonCss().active());
        } else {
            removeStyleName(resources.buttonCss().active());
        }
        this.value = value;
        if (fireEvents) {
            ValueChangeEvent.fire(this, value);
        }
    }

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

}