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    }