org.wicketstuff.stateless.components.StatelessAjaxButton.java Source code

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Here is the source code for org.wicketstuff.stateless.components.StatelessAjaxButton.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 org.wicketstuff.stateless.components;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.form.Button;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.IModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wicketstuff.stateless.behaviors.StatelessAjaxFormSubmitBehavior;

/**
 * Stateless version of AjaxButton
 * 
 * @since 1.3
 * 
 * @author Igor Vaynberg (ivaynberg)
 */
public abstract class StatelessAjaxButton extends Button {
    private static final long serialVersionUID = 1L;

    private static final Logger logger = LoggerFactory.getLogger(StatelessAjaxButton.class);

    private final Form<?> form;

    /**
     * Construct.
     * 
     * @param id
     */
    public StatelessAjaxButton(String id) {
        this(id, null, null);
    }

    /**
     * 
     * Construct.
     * 
     * @param id
     * @param model
     *            model used to set <code>value</code> markup attribute
     */
    public StatelessAjaxButton(String id, IModel<String> model) {
        this(id, model, null);
    }

    /**
     * 
     * Construct.
     * 
     * @param id
     * @param form
     */
    public StatelessAjaxButton(String id, Form<?> form) {
        this(id, null, form);
    }

    /**
     * Construct.
     * 
     * @param id
     * @param model
     *            model used to set <code>value</code> markup attribute
     * @param form
     */
    public StatelessAjaxButton(String id, IModel<String> model, final Form<?> form) {
        super(id, model);
        this.form = form;
    }

    @Override
    protected void onInitialize() {
        super.onInitialize();

        add(newAjaxFormSubmitBehavior("click"));
    }

    protected StatelessAjaxFormSubmitBehavior newAjaxFormSubmitBehavior(String event) {
        return new StatelessAjaxFormSubmitBehavior(event) {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onSubmit(AjaxRequestTarget target) {
                StatelessAjaxButton.this.onSubmit(target, StatelessAjaxButton.this.getForm());
            }

            @Override
            protected void onAfterSubmit(AjaxRequestTarget target) {
                StatelessAjaxButton.this.onAfterSubmit(target, StatelessAjaxButton.this.getForm());
            }

            @Override
            protected void onError(AjaxRequestTarget target) {
                StatelessAjaxButton.this.onError(target, StatelessAjaxButton.this.getForm());
            }

            @Override
            protected void updateAjaxAttributes(AjaxRequestAttributes attributes) {
                super.updateAjaxAttributes(attributes);

                // do not allow normal form submit to happen
                attributes.setPreventDefault(true);

                StatelessAjaxButton.this.updateAjaxAttributes(attributes);
            }

            @Override
            protected Form<?> findForm() {
                return StatelessAjaxButton.this.getForm();
            }
        };
    }

    protected void updateAjaxAttributes(AjaxRequestAttributes attributes) {
    }

    /**
     * Returns the form if it was set in constructor, otherwise returns the form nearest in parent
     * hierarchy.
     * 
     * @see org.apache.wicket.markup.html.form.FormComponent#getForm()
     */
    @Override
    public Form<?> getForm() {
        if (form != null) {
            return form;
        } else {
            return super.getForm();
        }
    }

    @Override
    protected void onComponentTag(ComponentTag tag) {
        // WICKET-5594 prevent non-Ajax submit
        tag.put("type", "button");

        super.onComponentTag(tag);
    }

    /**
     * This method is never called.
     * 
     * @see #onSubmit(AjaxRequestTarget, Form)
     */
    @Override
    public final void onSubmit() {
        logger.warn("unexpected invocation of #onSubmit() on {}", this);
    }

    @Override
    public final void onAfterSubmit() {
        logger.warn("unexpected invocation of #onAfterSubmit() on {}", this);
    }

    /**
     * This method is never called.
     * 
     * @see #onError(AjaxRequestTarget, Form)
     */
    @Override
    public final void onError() {
        logger.warn("unexpected invocation of #onError() on {}", this);
    }

    /**
     * Listener method invoked on form submit with no errors, before {@link Form#onSubmit()}.
     * 
     * @param target
     * @param form
     */
    protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
    }

    /**
     * Listener method invoked on form submit with no errors, after {@link Form#onSubmit()}.
     * 
     * @param target
     * @param form
     */
    protected void onAfterSubmit(AjaxRequestTarget target, Form<?> form) {
    }

    /**
     * Listener method invoked on form submit with errors
     * 
     * @param target
     * @param form
     */
    protected void onError(AjaxRequestTarget target, Form<?> form) {
    }

    @Override
    protected boolean getStatelessHint() {
        return true;
    };
}