[webkit-dev] Should editable webkit accept option space to insert
mjs at apple.com
Mon Feb 19 22:05:27 PST 2007
On Feb 19, 2007, at 9:49 PM, Rob Burns wrote:
> On Feb 19, 2007, at 11:30 PM, Maciej Stachowiak wrote:
>> On Feb 19, 2007, at 9:04 PM, Dan Wood wrote:
>>> Running blot, it appears that editable divs in webkit treat
>>> option-space as a regular space, not as a non-breaking space. I
>>> can't believe this could have been neglected, so maybe it's not a
>>> Personally, I'd like to be able to insert non-breaking spaces,
>>> since it would mirror other text fields.
>>> Any thoughts? Should I file a bug?
>> I think the reason this is done is because we use a sequence of
>> alternating normal spaces and non-breaking spaces, plus some
>> special WebKit-specific CSS properties, to achieve desired
>> whitespace behavior. We want multiple spaces to show up in the
>> middle of a line, but collapse away at the end, as in normal text
>> In WebKit-based clients, like Safari or Mail, we can get the
>> display to be just right, using a special CSS property. In other
>> clients, we want decent fallback. The closest you can get is
>> alternating space / nbsp, which preserves the multiple spaces but
>> will break in the middle if needed.
>> An alternate design for this that still allowed entering true non-
>> breaking spaces would be welcome - we could not figure out how
>> last time we thought about this.
> Perhaps I'm not understanding this correctly, but the alternating
> of non-breaking spaces with spaces should not prevent the
> deliberate insertion of a non-breaking space. If a user is actually
> hodling down the option key while typing space, the editor should
> insert a non-breaking space. While this could create rendering
> problems, that would just be the result of a user intentionally
> putting in too many non-breaking space. The user would be aware of
> what caused the problem. It's often necessary to deliberate use non-
> breaking spaces. The Cocoa text system allows this. For example, if
> I'm trying to prevent a runt at the end of paragraph I might want
> to type <option>-<space> before the final word of a paragraph.
> The alternating space non-break-space prevents the usual HTML/XML
> treatment of whitespace by collapsing multiple consecutive spaces
> into one space. Again, nothing should prevent WebKit from allowing
> users to intentionally insert a non-break-space.
The problems are:
1) WebKit's special property for these space / nbsp sequences makes
it treat both the same, so the literal non-breaking space would still
be treated by layout the space as a normal space.
2) WebKit reformats whitespace as you edit (deleting or inserting
spaces) to preserve alternating space/nbsp sequences, this would
smash any directly user-entered non-breaking spaces.
3) If you are in the middle of one of these space/nbsp sequences,
inserted a non-breaking space directly will not do what you expect.
you will be making a bigger cluster of non-breaking spaces than you
I'm sure it's possible to make it all work as desired but I suspect
it would be pretty complicated.
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