feat(demo): add flag-rendering demo

src/test/java/com/flowingcode/vaadin/addons/localecombobox/BaseLocaleComboBoxDemo.java

@@ -19,6 +19,7 @@
  */
 package com.flowingcode.vaadin.addons.localecombobox;
 
+import com.vaadin.flow.component.Component;
 import com.vaadin.flow.component.Text;
 import com.vaadin.flow.component.html.Div;
 import com.vaadin.flow.component.html.Span;
@@ -40,5 +41,15 @@ protected HorizontalLayout createHorizontalContainer(String title, LocaleComboBo
     container.expand(combo);
     return container;
   }
+
+  protected HorizontalLayout createHorizontalContainer(Component component, LocaleComboBox combo) {
+    HorizontalLayout container = new HorizontalLayout();
+    container.setWidthFull();
+    container.setAlignItems(Alignment.CENTER);
+    container.setJustifyContentMode(JustifyContentMode.BETWEEN);
+    container.add(component, combo);
+    container.expand(combo);
+    return container;
+  }
 
 }

src/test/java/com/flowingcode/vaadin/addons/localecombobox/DisplayModeDemo.java

@@ -28,7 +28,7 @@
 @DemoSource
 @PageTitle("Display modes")
 @SuppressWarnings("serial")
-@Route(value = "demo", layout = LocaleComboBoxDemoView.class)
+@Route(value = "locale-combo-box/display", layout = LocaleComboBoxDemoView.class)
 public class DisplayModeDemo extends BaseLocaleComboBoxDemo {
 
   public DisplayModeDemo() {

src/test/java/com/flowingcode/vaadin/addons/localecombobox/LocaleComboBoxDemoView.java

@@ -33,6 +33,7 @@ public class LocaleComboBoxDemoView extends TabbedDemo {
 
   public LocaleComboBoxDemoView() {
     addDemo(DisplayModeDemo.class);
+    addDemo(RenderingDemo.class);
     setSizeFull();
   }
 }

src/test/java/com/flowingcode/vaadin/addons/localecombobox/RenderingDemo.java

@@ -0,0 +1,57 @@
+/*-
+ * #%L
+ * LocaleComboBox Add-on
+ * %%
+ * Copyright (C) 2024 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.localecombobox;
+
+import com.flowingcode.vaadin.addons.demo.DemoSource;
+import com.vaadin.flow.component.checkbox.Checkbox;
+import com.vaadin.flow.router.PageTitle;
+import com.vaadin.flow.router.Route;
+import java.util.Locale;
+
+@DemoSource
+@PageTitle("Flag rendering")
+@SuppressWarnings("serial")
+@Route(value = "locale-combo-box/rendering", layout = LocaleComboBoxDemoView.class)
+public class RenderingDemo extends BaseLocaleComboBoxDemo {
+  public RenderingDemo() {
+
+    LocaleComboBox defaultLocaleCombo = new LocaleComboBox();
+    LocaleComboBox flagsLocaleCombo = new LocaleComboBox();
+    Checkbox checkbox = new Checkbox("Render flags");
+
+    defaultLocaleCombo.setValue(Locale.ITALY);
+    flagsLocaleCombo.setValue(Locale.ITALY);
+    checkbox.setValue(true);
+
+    /*
+     * You can choose whether the flags should be displayed alongside the locale names by using the
+     * setHasFlag method
+     */
+    checkbox.addValueChangeListener(event -> flagsLocaleCombo.setHasFlags(event.getValue()));
+
+    // #if vaadin eq 0
+    add(createHorizontalContainer("Flags are rendered by default:", defaultLocaleCombo));
+    add(createHorizontalContainer(checkbox, flagsLocaleCombo));
+    // #endif
+    // show-source add(defaultLocaleCombo);
+    // show-source add(checkbox, flagsLocaleCombo);
+
+  }
+}