Import source from react4j

Author: realityforge

src/main/java/react4j/widget/ReactWidget.gwt.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module>
+  <inherits name="react4j.dom.ReactDOM"/>
+  <inherits name="com.google.gwt.user.UI"/>
+
+  <source path=''/>
+</module>

src/main/java/react4j/widget/ReactWidget.java

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+package react4j.widget;
+
+import com.google.gwt.dom.client.Document;
+import com.google.gwt.dom.client.Element;
+import com.google.gwt.user.client.ui.Widget;
+import java.util.Objects;
+import javax.annotation.Nonnull;
+import jsinterop.base.Js;
+import react4j.core.ReactNode;
+import react4j.dom.ReactDOM;
+
+/**
+ * A GWT widget that renders a React4j element.
+ */
+public class ReactWidget
+  extends Widget
+{
+  /**
+   * The GWT Element representation.
+   */
+  private final Element _element;
+  /**
+   * The react widget to render.
+   */
+  private final ReactNode _reactElement;
+
+  /**
+   * Create the widget.
+   *
+   * @param reactElement the react element to render.
+   */
+  public ReactWidget( @Nonnull final ReactNode reactElement )
+  {
+    _element = Document.get().createDivElement();
+    _reactElement = Objects.requireNonNull( reactElement );
+    setElement( _element );
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void onAttach()
+  {
+    super.onAttach();
+    ReactDOM.render( _reactElement, Js.uncheckedCast( _element ) );
+
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void onDetach()
+  {
+    ReactDOM.unmountComponentAtNode( Js.uncheckedCast( _element ) );
+    super.onDetach();
+  }
+}