feat(demo): add new demo for readonly mode

Author: paodb

src/test/java/com/flowingcode/vaadin/addons/chipfield/ChipfieldDemoView.java

@@ -35,6 +35,7 @@ public class ChipfieldDemoView extends TabbedDemo {
   private static final String RESTRICTED_DEMO = "Restricted";
   private static final String DISABLED_DEMO = "Disabled";
   private static final String BINDER_DEMO = "Binder";
+  private static final String READONLY_DEMO = "Readonly";
   private static final String DATAPROVIDER_SOURCE =
       "https://github.com/FlowingCode/ChipFieldAddon/blob/master/src/test/java/com/flowingcode/vaadin/addons/chipfield/DataProviderDemo.java";
   private static final String RESTRICTED_SOURCE =
@@ -43,12 +44,15 @@ public class ChipfieldDemoView extends TabbedDemo {
       "https://github.com/FlowingCode/ChipFieldAddon/blob/master/src/test/java/com/flowingcode/vaadin/addons/chipfield/DisabledDemo.java";
   private static final String BINDER_SOURCE =
       "https://github.com/FlowingCode/ChipFieldAddon/blob/master/src/test/java/com/flowingcode/vaadin/addons/chipfield/BinderDemo.java";
+  private static final String READONLY_SOURCE =
+      "https://github.com/FlowingCode/ChipFieldAddon/blob/master/src/test/java/com/flowingcode/vaadin/addons/chipfield/ReadonlyDemo.java";
 
   public ChipfieldDemoView() {
 
     addDemo(new DataProviderDemo(), DATAPROVIDER_DEMO, DATAPROVIDER_SOURCE);
     addDemo(new RestrictedDemo(), RESTRICTED_DEMO, RESTRICTED_SOURCE);
     addDemo(new DisabledDemo(), DISABLED_DEMO, DISABLED_SOURCE);
     addDemo(new BinderDemo(), BINDER_DEMO, BINDER_SOURCE);
+    addDemo(new ReadonlyDemo(), READONLY_DEMO, READONLY_SOURCE);
   }
 }

src/test/java/com/flowingcode/vaadin/addons/chipfield/ReadonlyDemo.java

@@ -0,0 +1,35 @@
+/*-
+ * #%L
+ * ChipField Addon
+ * %%
+ * Copyright (C) 2018 - 2021 Flowing Code
+ * %%
+ * Licensed 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.
+ * #L%
+ */
+package com.flowingcode.vaadin.addons.chipfield;
+
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+
+@SuppressWarnings("serial")
+public class ReadonlyDemo extends VerticalLayout {
+  public ReadonlyDemo() {
+    ChipField<String> chf = new ChipField<>("Readonly", "Mercury", "Venus", "Earth");
+    chf.setWidthFull();
+    chf.addSelectedItem("Mercury");
+    chf.addSelectedItem("Venus");
+    chf.setReadOnly(true);
+
+    add(chf);
+  }
+}