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From "Alexey A. Ivanov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-4662) [classlib][swing][html] CSS is used to specify HTML tag behavior
Date Wed, 22 Aug 2007 07:08:39 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-4662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521711
] 

Alexey A. Ivanov commented on HARMONY-4662:
-------------------------------------------

OK, I agree to the fact that for some elements we should ensure it *behaves* the way the specification
declares. You should have noticed that <b> and <i> elements were rendered in bold
and italic correspondingly despite the fact the default style sheet was removed.
This is achieved by setting some default attributes in javax.swing.text.html.HTMLDocument.initDefaultCharacterAttributes.
The same way, you can make <center> to always center its contents. But I'm inclined
to keep such special declarations to a minimum. One thing to keep in mind is that attributes
set in this way cannot be overridden using style sheet.

> [classlib][swing][html] CSS is used to specify HTML tag behavior
> ----------------------------------------------------------------
>
>                 Key: HARMONY-4662
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4662
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Vasily Zakharov
>         Attachments: Harmony.jpg, RI.jpg
>
>
> For now Harmony uses modules/swing/src/main/java/common/javax/swing/text/html/default.css
file to specify behavior for many HTML tags, like <center>, <b>, and some others.
Moreover, it seems that RI does the same for many tags. This is quite comfortable and efficient,
but is not quite compliant to HTML specification because default CSS may be replaced and tags
start to behave incompatibly to the specification.
> The following test shows how the tags operate by default and with default CSS replaced
with empty stylesheet:
> import java.awt.Container;
> import javax.swing.*;
> import javax.swing.border.*;
> import javax.swing.text.html.*;
> public class Test {
>     static final String testHTML =
>             "<h1>Heading 1</h1><h2>Heading 2</h2><h3>Heading
3</h3>"
>           + "<h4>Heading 4</h4><h5>Heading 5</h5><h6>Heading
6</h6>"
>           + "<p>paragraph</p><pre>  pre\n   pre</pre><center>center</center>"
>           + "<p><b>bold</b> <strong>strong</strong> <i>italic</i>
<em>em</em></p>"
>           + "<p><small>small</small> normal <big>big</big></p>"
>           + "<a>aaa</a> <a href=\"\">href</a> <code>code</code>
<tt>tt</tt>";
>     public static void main(String argv[]) {
>         try {
>             JFrame frame = new JFrame("Test");
>             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>             Container pane = frame.getContentPane();
>             pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS));
>             Border border = new BevelBorder(BevelBorder.LOWERED);
>             JEditorPane defaultPane = new JEditorPane("text/html", testHTML);
>             defaultPane.setBorder(new TitledBorder(border, "Default CSS",
>                     TitledBorder.LEFT, TitledBorder.ABOVE_TOP));
>             JEditorPane replacedPane = new JEditorPane("text/html", "");
>             replacedPane.setBorder(new TitledBorder(border, "Empty CSS",
>                     TitledBorder.LEFT, TitledBorder.ABOVE_TOP));
>             HTMLEditorKit editorKit = new HTMLEditorKit();
>             StyleSheet styleSheet = new StyleSheet();
>             editorKit.setStyleSheet(styleSheet);
>             replacedPane.setEditorKit(editorKit);
>             replacedPane.setText(testHTML);
>             pane.add(defaultPane);
>             pane.add(replacedPane);
>             frame.pack();
>             frame.setVisible(true);
>         } catch (Exception e) {
>             e.printStackTrace(System.out);
>         }
>     }
> }
> The attached screenshots demonstrate the behavior of RI and Harmony.
> As one may see, on both RI and Harmony only <b> and <i> tags operate normally
with empty stylesheet, and also <pre> tag retains part of its functionality (spaces
are not merged).

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