feat(demo): add demo with Binder

Author: javier-godoy

src/test/java/com/flowingcode/vaadin/addons/markdown/MarkdownBinderDemo.java

@@ -0,0 +1,67 @@
+/*-
+ * #%L
+ * Markdown Editor Add-on
+ * %%
+ * Copyright (C) 2024-2025 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.markdown;
+
+import com.flowingcode.vaadin.addons.demo.DemoSource;
+import com.vaadin.flow.component.button.Button;
+import com.vaadin.flow.component.notification.Notification;
+import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.data.binder.Binder;
+import com.vaadin.flow.router.PageTitle;
+import com.vaadin.flow.router.Route;
+
+@DemoSource
+@PageTitle("Markdown Editor with Binder")
+@SuppressWarnings("serial")
+@Route(value = "markdown-editor/binder", layout = MarkdownDemoView.class)
+public class MarkdownBinderDemo extends VerticalLayout {
+
+  public MarkdownBinderDemo() {
+    setSizeFull();
+    Binder<Bean> binder = new Binder<>();
+    MarkdownEditor mde = new MarkdownEditor();
+    mde.setSizeFull();
+    mde.setPlaceholder("Enter Markdown here");
+    mde.setMaxLength(500);
+
+    binder.forField(mde).bind(Bean::getText, Bean::setText);
+    binder.setBean(new Bean());
+
+    Button getContentButton =
+        new Button("Show content", ev -> Notification.show(binder.getBean().getText()));
+    Button setSampleContent =
+        new Button("Set sample content", ev -> mde.setValue("**Hello** _world_"));
+    add(mde, new HorizontalLayout(getContentButton, setSampleContent));
+  }
+
+  private static class Bean {
+    String text;
+
+    public String getText() {
+      return text;
+    }
+
+    public void setText(String text) {
+      this.text = text;
+    }
+  }
+
+}

src/test/java/com/flowingcode/vaadin/addons/markdown/MarkdownDemoView.java

@@ -34,6 +34,7 @@ public class MarkdownDemoView extends TabbedDemo {
   public MarkdownDemoView() {
     addDemo(MarkdownViewerDemo.class);
     addDemo(MarkdownEditorDemo.class);
+    addDemo(MarkdownBinderDemo.class);
     setSizeFull();
   }
 }