    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
    015package org.apache.tapestry5.internal.util;
    016
    017import org.apache.tapestry5.Field;
    018import org.apache.tapestry5.FieldFocusPriority;
    019import org.apache.tapestry5.ValidationDecorator;
    020import org.apache.tapestry5.ValidationTracker;
    021import 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 */
    027public 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}