com.locke.library.web.utilities.focus.Focuser.java Source code

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Here is the source code for com.locke.library.web.utilities.focus.Focuser.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.locke.library.web.utilities.focus;

import java.io.Serializable;

import org.apache.wicket.Component;

import com.locke.library.locator.ISource;
import com.locke.library.web.behaviors.focus.FocusBehavior;

/**
 * Sets the focus on something {@link IFocusable}, by adding a
 * {@link FocusBehavior} to the component returned by the {@link ISource} of
 * that {@link IFocusable}.
 * 
 * @author Jonathan Locke
 */
public class Focuser implements Serializable {

    private static final long serialVersionUID = 452250835800945960L;

    private final ISource<Component> componentSource;

    /**
     * @param focusable
     *            The focusable to use when setting focus
     */
    public Focuser(ISource<Component> componentSource) {
        this.componentSource = componentSource;
    }

    /**
     * Sets focus to the first component returned by the locator
     */
    public void setFocus() {
        final Component focus = componentSource.first();
        if (focus != null) {
            focus.add(new FocusBehavior());
        }
    }
}