From 19087ad08ecc92c5cf97a9c8474e272bfb854696 Mon Sep 17 00:00:00 2001
From: Manuel Schrag <msc@ims.ch>
Date: Mon, 23 Nov 2015 13:47:54 +0100
Subject: [PATCH] Reproduce allowSingleDeselect Issue #285 with custom
 filtering

---
 .../application/widgetsample/ViewView.java    | 38 +++++++++++++++++--
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/sample/src/main/java/com/arcbees/chosen/sample/client/application/widgetsample/ViewView.java b/sample/src/main/java/com/arcbees/chosen/sample/client/application/widgetsample/ViewView.java
index 3c28a8b..b08a1f4 100644
--- a/sample/src/main/java/com/arcbees/chosen/sample/client/application/widgetsample/ViewView.java
+++ b/sample/src/main/java/com/arcbees/chosen/sample/client/application/widgetsample/ViewView.java
@@ -16,6 +16,12 @@
 
 package com.arcbees.chosen.sample.client.application.widgetsample;
 
+import java.util.List;
+import java.util.logging.Logger;
+
+import com.arcbees.chosen.client.ChosenImpl;
+import com.arcbees.chosen.client.ChosenOptions;
+import com.arcbees.chosen.client.ResultsFilter;
 import com.arcbees.chosen.client.event.ChosenChangeEvent;
 import com.arcbees.chosen.client.event.ChosenChangeEvent.ChosenChangeHandler;
 import com.arcbees.chosen.client.event.HidingDropDownEvent.HidingDropDownHandler;
@@ -41,6 +47,7 @@
 import static com.google.gwt.query.client.GQuery.$;
 
 public class ViewView implements IsWidget {
+
     @UiField
     static AppResources res;
 
@@ -53,6 +60,27 @@ public String getLiteral() {
         }
     }
 
+    private static class ChoicesCustomFilter implements ResultsFilter {
+
+        private final Logger log = Logger.getLogger("ViewView");
+
+        private ChosenValueListBox<Choices> valueListBox;
+
+        @Override
+        public void filter(String searchText, ChosenImpl chosen, boolean isShowing) {
+            List<Choices> list = Lists.newArrayList(Choices.values());
+            list.add(0, null);
+            if (valueListBox != null) {
+                log.fine("Setting new values from custom filter with null element");
+                valueListBox.setAcceptableValues(list);
+            }
+        }
+
+        public void setValueListBox(ChosenValueListBox<Choices> valueListBox) {
+            this.valueListBox = valueListBox;
+        }
+    }
+
     private static class ChoiceRenderer extends AbstractRenderer<Choices> {
         @Override
         public String render(Choices choices) {
@@ -136,7 +164,12 @@ interface Binder extends UiBinder<Widget, ViewView> {
 
     public ViewView() {
         teamChosen = new ChosenListBox(true);
-        chosenValueListBox = new ChosenValueListBox<Choices>(new ChoiceRenderer());
+        ChosenOptions options = new ChosenOptions();
+        ChoicesCustomFilter customFilter = new ChoicesCustomFilter();
+        options.setAllowSingleDeselect(true);
+        options.setResultFilter(customFilter);
+        chosenValueListBox = new ChosenValueListBox<Choices>(new ChoiceRenderer(), options);
+        customFilter.setValueListBox(chosenValueListBox);
         multipleChosenValueListBox = new MultipleChosenValueListBox<Choices>(new ChoiceRenderer());
 
         widget = binder.createAndBindUi(this);
@@ -203,9 +236,6 @@ private void init() {
 
         teamChosen.setWidth("300px");
 
-        chosenValueListBox.setAcceptableValues(Lists.newArrayList(Choices.values()));
-        chosenValueListBox.setValue(Choices.THIRD);
-
         multipleChosenValueListBox.setAcceptableValues(Lists.newArrayList(Choices.values()));
         multipleChosenValueListBox.setValue(Lists.newArrayList(Choices.FIFTH, Choices.FIRST, Choices.FOURTH));