    001    // Copyright 2008, 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal.util;
    016
    017    import org.apache.tapestry5.Field;
    018    import org.apache.tapestry5.FieldFocusPriority;
    019    import org.apache.tapestry5.ValidationDecorator;
    020    import org.apache.tapestry5.ValidationTracker;
    021    import org.apache.tapestry5.services.javascript.JavaScriptSupport;
    022
    023    /**
    024     * Used by {@link org.apache.tapestry5.corelib.components.Form} to determine which fields will be focused and a what
    025     * priority.
    026     */
    027    public class AutofocusValidationDecorator extends ValidationDecoratorWrapper
    028    {
    029        private final ValidationTracker tracker;
    030
    031        private final JavaScriptSupport jsSupport;
    032
    033        public AutofocusValidationDecorator(ValidationDecorator delegate, ValidationTracker tracker,
    034                JavaScriptSupport javascriptSupport)
    035        {
    036            super(delegate);
    037            this.tracker = tracker;
    038            this.jsSupport = javascriptSupport;
    039        }
    040
    041        @Override
    042        public void insideField(Field field)
    043        {
    044            super.insideField(field);
    045
    046            if (!field.isDisabled())
    047            {
    048                jsSupport.autofocus(getPriority(field), field.getClientId());
    049            }
    050        }
    051
    052        private FieldFocusPriority getPriority(Field field)
    053        {
    054            if (tracker.inError(field))
    055                return FieldFocusPriority.IN_ERROR;
    056
    057            if (field.isRequired())
    058                return FieldFocusPriority.REQUIRED;
    059
    060            return FieldFocusPriority.OPTIONAL;
    061        }
    062    }