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  1. JDK
  2. JDK-8210970

MathML editing issues in HTMLEditor

    Details

    • Subcomponent:
      web
    • CPU:
      x86_64
    • OS:
      generic

      Description

      ADDITIONAL SYSTEM INFORMATION :
      This occurs with Windows 10 and Linux, running Java 8 b192 or Java 11 EA + JavaFX 11 EA.

      A DESCRIPTION OF THE PROBLEM :
      This report concerns the issues and enhancements related to HTMLEditor editing capabilities.

      Presently, the patch for JDK-8147476 solves MathML display issues in WebView. Consequently, it solves MathML display in HTMLEditor too. The MathML rendering is pretty good and equivalent to MathML Rendering with Safari.
      I think that JDK-8089878, which describes only rendering issues, is also solved.

      Set HTMLEditor content with the following code displays the quadratic formula as expected in JDK-8089878.

      <math display="block">
         <mrow>
            <mi>x</mi>
            <mo>=</mo>
            <mfrac>
               <mrow>
                  <mo>−</mo>
                  <mi>b </mi>
                  <mo>±</mo>
                  <msqrt>
                     <mrow>
                        <msup>
                           <mi>b</mi>
                           <mn>2</mn>
                        </msup>
                        <mo>−</mo>
                        <mn>4</mn>
                        <mi>a</mi>
                        <mi>c</mi>
                     </mrow>
                  </msqrt>
               </mrow>
               <mrow>
                  <mn>2</mn>
                  <mi>a</mi>
               </mrow>
            </mfrac>
         </mrow>
      </math>

      Bugs :
      -Trying to modify a formula will occurate some trouble in your document. For example, try to modifiy the previous formula, by removing 2a from the fraction, this will break your formula.
      - MathML content is not updated after an insertion. This only occurs when MathML Token are in a table like in the Mozilla MathML Torture Test.
      - Cursor disappears in <mi> token when the identifier name has only one character. If the name of the identifier is longer than 1 character, the cursor appears normaly. This not occurs in <mn> and <mo>.
      - In <mo>, cursor disappears too.
      - Bad selection logic. Some parts of the formula disappear and selection should be only one rectangle not many rectangles.


      Enhancements : A common user can not easily and directly use MathML to insert a mathematic formula in HTMLEditor.
      - MathML language is too verbose, an interface like AsciiMath for editing would be appreciate.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Each test could be made with the previous MathML code.


      ---------- BEGIN SOURCE ----------
      import javafx.application.Application;
      import javafx.event.ActionEvent;
      import javafx.event.EventHandler;
      import javafx.geometry.Insets;
      import javafx.geometry.Pos;
      import javafx.scene.Group;
      import javafx.scene.Scene;
      import javafx.scene.control.Button;
      import javafx.scene.control.Label;
      import javafx.scene.control.ScrollPane;
      import javafx.scene.layout.VBox;
      import javafx.scene.web.HTMLEditor;
      import javafx.stage.Stage;

      /**
       * A sample that demonstrates the HTML Editor. You can make changes to the
       * example text, and the resulting generated HTML is displayed.
       *
       * @related controls/text/SimpleLabel
       * @see javafx.scene.web.HTMLEditor
       */
      public class HTMLEditorApp extends Application {

          private HTMLEditor htmlEditor = null;
          private final String INITIAL_TEXT = ""
                  + "<html>"
                  + "<body>"
                  + "<p>A quadratic formula "
                  + "<math>"
                  + " <mrow>"
                  + " <mi>x</mi>"
                  + " <mo>=</mo>"
                  + " <mfrac>"
                  + " <mrow>"
                  + " <mo>−</mo>"
                  + " <mi>b </mi>"
                  + " <mo>±</mo>"
                  + " <msqrt>"
                  + " <mrow>"
                  + " <msup>"
                  + " <mi>b</mi>"
                  + " <mn>2</mn>"
                  + " </msup>"
                  + " <mo>−</mo>"
                  + " <mn>4</mn>"
                  + " <mi>a</mi>"
                  + " <mi>c</mi>"
                  + " </mrow>"
                  + " </msqrt>"
                  + " </mrow>"
                  + " <mrow>"
                  + " <mn>2</mn>"
                  + " <mi>a</mi>"
                  + " </mrow>"
                  + " </mfrac>"
                  + " </mrow>"
                  + "</math>"
                  + " displayed in a presentation text."
                  + "</p>"
                  + "</body>"
                  + "</html>";

          private void init(Stage primaryStage) {
              Group root = new Group();
              primaryStage.setScene(new Scene(root));
              VBox vRoot = new VBox();

              vRoot.setPadding(new Insets(8, 8, 8, 8));
              vRoot.setSpacing(5);

              htmlEditor = new HTMLEditor();
              htmlEditor.setPrefSize(500, 245);
              htmlEditor.setHtmlText(INITIAL_TEXT);
              vRoot.getChildren().add(htmlEditor);

              final Label htmlLabel = new Label();
              htmlLabel.setMaxWidth(500);
              htmlLabel.setWrapText(true);

              ScrollPane scrollPane = new ScrollPane();
              scrollPane.getStyleClass().add("noborder-scroll-pane");
              scrollPane.setContent(htmlLabel);
              scrollPane.setFitToWidth(true);
              scrollPane.setPrefHeight(180);

              Button showHTMLButton = new Button("Show the HTML below");
              vRoot.setAlignment(Pos.CENTER);
              showHTMLButton.setOnAction(new EventHandler<ActionEvent>() {

                  @Override
                  public void handle(ActionEvent arg0) {
                      htmlLabel.setText(htmlEditor.getHtmlText());
                  }
              });

              vRoot.getChildren().addAll(showHTMLButton, scrollPane);
              root.getChildren().addAll(vRoot);
          }

          @Override
          public void start(Stage primaryStage) throws Exception {
              init(primaryStage);
              primaryStage.show();
          }

          /**
           * The main() method is ignored in correctly deployed JavaFX application.
           * main() serves only as fallback in case the application can not be
           * launched through deployment artifacts, e.g., in IDEs with limited FX
           * support. NetBeans ignores main().
           *
           * @param args the command line arguments
           */
          public static void main(String[] args) {
              launch(args);
          }
      }
      ---------- END SOURCE ----------

      FREQUENCY : always


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              • Assignee:
                Unassigned
                Reporter:
                webbuggrp Webbug Group
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                • Created:
                  Updated: