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.table.filter;
  
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.ajax.form.OnChangeAjaxBehavior;
  import org.apache.wicket.markup.html.form.TextField;
  import org.apache.wicket.markup.html.panel.Panel;
  import org.apache.wicket.model.Model;
  
  import org.apache.causeway.viewer.wicket.ui.components.table.DataTableWithPagesAndFilter;
  import org.apache.causeway.viewer.wicket.ui.util.Wkt;
  
  import lombok.Getter;
  
  public class FilterToolbar extends Panel {
  
      private static final long serialVersionUID = 1L;
      private static final String ID_TABLE_SEARCH_INPUT = "table-search-input";
      private static final String ID_TABLE_SEARCH_BUTTON = "table-search-button";
      private static final String ID_TABLE_SEARCH_CLEAR = "table-search-clear";
  
      /**
       * DataTable this search bar is attached to.
       */
      @Getter
      private final DataTableWithPagesAndFilter<?, ?> table;
  
      public FilterToolbar(final String id, final DataTableWithPagesAndFilter<?, ?> table) {
          super(id);
          this.table = table;
      }
  
      /**
       * Only shows this search bar when there are more than 1 rows (unfiltered).
       */
      @Override
      protected void onConfigure() {
          super.onConfigure();
          buildGui();
          setVisible(table.elementCount() > 1);
      }
  
      // -- HELPER
  
      private void buildGui() {
  
          var tableModel = table.tableModel();
          var searchField = new TextField<>(ID_TABLE_SEARCH_INPUT, Model.of(tableModel.searchArgumentBindable().getValue()));
          Wkt.attributeReplace(searchField, "placeholder", tableModel.getSearchPromptPlaceholderText());
  
          Wkt.linkAdd(this, ID_TABLE_SEARCH_BUTTON, target->{
              propagateUpdate(target, searchField.getValue());
          });
  
          Wkt.linkAdd(this, ID_TABLE_SEARCH_CLEAR, target->{
              searchField.setModelObject(null);
              target.add(searchField);
              propagateUpdate(target, searchField.getValue());
          });
  
          searchField.add(new OnChangeAjaxBehavior() {
              private static final long serialVersionUID = 1L;
              @Override
              protected void onUpdate(final AjaxRequestTarget target) {
                  // no-op; however, it seems we need to install this behavior,
                  // in order for the server side model to receive updates at all
              }
          });
  
          addOrReplace(searchField);
      }
  
      private void propagateUpdate(final AjaxRequestTarget target, final String searchArg) {
          // on searchArg update originating from end-user in UI
          table.setSearchArg(searchArg);
          table.setSearchHintAndBroadcast(target);
          // tells the table component to re-render
          target.add(table);
      }
  
  }
  