More HTMLEditorKit advice needed

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John English - 19 Mar 2004 14:01 GMT

After much experimentation, I've got something which can display an HTML
page and wich lets me modify bold & italic attributes of the text. But
I have some niggly questions:

1) To bolden, I obtain a MutableAttributeSet for the selected text and
use addAttribute to add HTML.Tag.B but to cancel boldness I have to
then use removeAttribute to remove both the HTML.Tag.B and
Font-weight attributes. Am I doing this the right way? Do I really
have to know what font styles to remove in addition to the tag I'm
dealing with?

2) How do I arrange things to insert (e.g.) bold text when I don't have
any text selected? In other words, I want to be able to click a
button to turn boldening on or off at the current insertion point
so that anything I type at that point is inserted as bold text (or
not-bold in the middle of some bold text).

3) How do I insert line breaks <br> and paragraph styles (<h1>, <p>,
<pre> and so on)?

If anyone can advise me I'd be very grateful. The documemtation doesn't
exactly go out of its way to make this clear...

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Chris Smith - 19 Mar 2004 14:24 GMT

> After much experimentation, I've got something which can display an HTML
> page and wich lets me modify bold & italic attributes of the text. But
[quoted text clipped - 6 lines]
> have to know what font styles to remove in addition to the tag I'm
> dealing with?

Yes. I think the intent was to make one implied by the other, but there
are gaps where StyleConstants and the corresponding HTML attributes get
out of sync. In those cases, you have to remember to set both
appropriately.

> 2) How do I arrange things to insert (e.g.) bold text when I don't have
> any text selected? In other words, I want to be able to click a
> button to turn boldening on or off at the current insertion point
> so that anything I type at that point is inserted as bold text (or
> not-bold in the middle of some bold text).

See the StyledEditorKit.getInputAttributes method. Storing an attribute
in there will cause it to be used for newly inserted text by the default
insertion actions.

> 3) How do I insert line breaks <br> and paragraph styles (<h1>, <p>,
> <pre> and so on)?

It's not exactly trivial, and it depends on exactly what you plan to
insert.

> If anyone can advise me I'd be very grateful. The documemtation doesn't
> exactly go out of its way to make this clear...

I've done a lot of this work of dealing with quirks in HTMLEditorKit and
its associated classes, and MindIQ is attempting to release it as open-
source code. I don't have the time at the moment, though, to clean it
up and prep it for release, though. If you're interested in helping
with that, it may be easier than reinventing what we've already done.
Contact me offline if you're interested.

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More HTMLEditorKit advice needed

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