Customize the JavaFX HTMLEditor

HTMLEditorCustomizationSample.java

import java.util.List;
import java.util.regex.Pattern;
import javafx.application.*;
import javafx.collections.FXCollections;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.effect.*;
import javafx.scene.image.*;
import javafx.scene.web.HTMLEditor;
import javafx.stage.Stage;
 
public class HTMLEditorCustomizationSample extends Application {
  // limits the fonts a user can select from in the html editor.
  private static final List<String> limitedFonts = FXCollections.observableArrayList("Arial", "Times New Roman", "Courier New", "Comic Sans MS");

  public static void main(String[] args) { launch(args); }
  @Override public void start(Stage stage) {
    // create a new html editor and show it before we start modifying it.
    final HTMLEditor htmlEditor = new HTMLEditor();
    stage.setScene(new Scene(htmlEditor));
    stage.show();
    
    // hide controls we don't need.
    hideImageNodesMatching(htmlEditor, Pattern.compile(".*(Cut|Copy|Paste).*"), 0);
    Node seperator = htmlEditor.lookup(".separator");
    seperator.setVisible(false); seperator.setManaged(false);
    
    // modify font selections.
    int i = 0;
    for (Node candidate: (htmlEditor.lookupAll("MenuButton"))) {
      // fonts are selected by the second menu in the htmlEditor.
      if (candidate instanceof MenuButton && i == 1) {
        // limit the font selections to our predefined list.
        MenuButton menuButton = (MenuButton) candidate;
        List<MenuItem> removalList = FXCollections.observableArrayList();
        final List<MenuItem> fontSelections = menuButton.getItems();
        for (MenuItem item: fontSelections) {
          if (!limitedFonts.contains(item.getText())) {
            removalList.add(item);
          }
        }
        fontSelections.removeAll(removalList);
        // Select a font from out limited font selection.
        // Selection done in Platform.runLater because if you try to do
        // the selection immediately, it won't take place.
        Platform.runLater(new Runnable() {
          @Override public void run() {
            boolean fontSelected = false;
            for (final MenuItem item: fontSelections) {
              if ("Comic Sans MS".equals(item.getText())) {
                if (item instanceof RadioMenuItem) {
                  ((RadioMenuItem) item).setSelected(true);
                  fontSelected = true;
                }
              }
            }
            if (!fontSelected && fontSelections.size() > 0 && fontSelections.get(0) instanceof RadioMenuItem) {
              ((RadioMenuItem) fontSelections.get(0)).setSelected(true);
            }
          }
        });  
      }
      i++;
    }
    // add a custom button to the top toolbar.
    Node node = htmlEditor.lookup(".top-toolbar");
    if (node instanceof ToolBar) {
      ToolBar bar = (ToolBar) node;
      ImageView graphic = new ImageView(new Image("http://bluebuddies.com/gallery/title/jpg/Smurf_Fun_100x100.jpg", 32, 32, true, true));
      graphic.setEffect(new DropShadow());
      Button smurfButton = new Button("", graphic);
      bar.getItems().add(smurfButton);
      smurfButton.setOnAction(new EventHandler<ActionEvent>() {
        @Override public void handle(ActionEvent arg0) {
          htmlEditor.setHtmlText("<font face='Comic Sans MS' color='blue'>Smurfs are having fun :-)</font>");
        }
      });
    }
  }

  // hide buttons containing nodes whose image url matches a given name pattern.
  public void hideImageNodesMatching(Node node, Pattern imageNamePattern, int depth) {
    if (node instanceof ImageView) {
      ImageView imageView = (ImageView) node;
      String url = imageView.getImage().impl_getUrl();
      if (url != null && imageNamePattern.matcher(url).matches()) {
        Node button = imageView.getParent().getParent();
        button.setVisible(false); button.setManaged(false);
      }
    }
    if (node instanceof Parent) 
      for (Node child : ((Parent) node).getChildrenUnmodifiable()) 
        hideImageNodesMatching(child, imageNamePattern, depth + 1);
  }
}

This example was written a long time ago. From the comments it would seem that it no longer works with more recent JavaFX versions. If somebody would like to spend the effort to get it working or provide a similar example, they can fork the gist and add their modifications and place a link to the modified gist, noting what they did, in a comment here.

Did you by any chance encounter a rich text javafx component?

https://github.com/FXMisc/RichTextFX