content: /*
   *  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.apache.causeway.viewer.wicket.ui.components.widgets.fileinput;
  
  import java.util.List;
  
  import org.apache.wicket.markup.head.CssHeaderItem;
  import org.apache.wicket.markup.head.HeaderItem;
  import org.apache.wicket.markup.head.IHeaderResponse;
  import org.apache.wicket.markup.html.form.upload.FileUpload;
  import org.apache.wicket.model.IModel;
  import org.apache.wicket.request.resource.CssResourceReference;
  
  import org.apache.causeway.viewer.wicket.ui.util.WktHeaderItems;
  
  import lombok.Getter;
  import lombok.SneakyThrows;
  import lombok.experimental.Accessors;
  
  import de.agilecoders.wicket.extensions.markup.html.bootstrap.form.fileinput.BootstrapFileInputField;
  import de.agilecoders.wicket.extensions.markup.html.bootstrap.form.fileinput.FileInputConfig;
  
  public class FileUploadFieldWithNestingFix extends BootstrapFileInputField {
  
      private static final long serialVersionUID = 1L;
  
      @Getter(lazy = true) @Accessors(fluent = true)
      private static final HeaderItem headerItem =
                  WktHeaderItems.forScriptReferenceAsOnDomReady(
                          FileUploadFieldWithNestingFix.class, "causeway-file-upload-nesting-fix.nocompress.js");
      
      private static final CssResourceReference CSS =
          new CssResourceReference(FileUploadFieldWithNestingFix.class, "FileUploadFieldWithNestingFix.css");
  
      public FileUploadFieldWithNestingFix(final String id,
              final IModel<List<FileUpload>> model, final FileInputConfig config) {
          super(id, model, config);
      }
  
      @Override @SneakyThrows
      public void renderHead(final IHeaderResponse response) {
          super.renderHead(response);
          response.render(headerItem());
          response.render(CssHeaderItem.forReference(CSS));
      }
      
      @Override
      public boolean isRequired() {
          //FIXME[CAUSEWAY-3203]
          return false; // nothing else worked yet
      }
  
  //experiments ...
  //        @Override
  //        public void convertInput() {
  //            super.convertInput(); // keep side-effects
  //            if(!isRequired()) {return;}
  //            /*[CAUSEWAY-3203]: in the context of mandatory property or action parameter negotiation,
  //             * we need to set the converted input to something other than null, even an empty list will do
  //             */
  //            if(isConvertedInputNull()
  //                    && !isModelEmpty()) {
  //                super.setConvertedInput(Collections.emptyList()); // always pass
  //            }
  //        }
  //        @Override
  //        public boolean checkRequired() {
  //            super.checkRequired(); // keep side-effects
  //            return true; // always pass otherwise workaround won't work
  //        }
  //        private boolean isModelEmpty() { return getModel().getObject()==null; }
  //        private boolean isConvertedInputNull() { return getConvertedInput()==null; }
  
  }
  