[webkit-dev] Scrollbar Changes

Dave Hyatt hyatt at apple.com
Sat Sep 13 18:24:17 PDT 2008

The current Windows scrollbar checked into ToT handles this case.

(hyatt at apple.com)

Darin Fisher wrote:
> Don't forget that scroll arrows need to change state when you hover
> over the scroll thumb in Vista.  (That's a Vista-ism that many custom
> scroll bar implementations--for example IE8--miss.)
> -Darin
> On Fri, Sep 12, 2008 at 12:06 PM, Dave Hyatt <hyatt at apple.com> wrote:
>> Scrollbars are going to be changing substantially in the next couple of
>> weeks.
>> Right now several ports have their own versions of PlatformScrollbar
>> that all clone the same logic (with the only difference between the
>> classes being metrics and rendering).
>> The current plan for refactoring is to eliminate PlatformScrollbar and
>> make Scrollbar into a class that handles scrolling using a non-native
>> cross-platform implementation.  The Scrollbar class will be talking to a
>> new ScrollbarTheme interface that will be platform-specific.
>> ScrollbarTheme will be responsible for rendering scrollbars (and
>> providing metrics for scrollbars).
>> If any ports have special needs for this Scrollbar class (or for
>> ScrollbarTheme), send me email or respond in this thread.  I know that
>> both WebKit on OS X and Google Chrome have need of tickmarks support on
>> scrollbars, so this will ultimately need to be built into the rendering
>> model.
>> Classes that still require truly native scrollbars can subclass
>> Scrollbar (with the only cost being a handful of wasted member variables
>> in Scrollbar), although we would strongly encourage ports not to use
>> native scrollbars.  We will even be abandoning the native
>> PlatformScrollbar implementation on the Mac.
>> The new cross-platform Scrollbar class is going to support styling via
>> CSS (initially for overflow sections only).  If your port doesn't use
>> this class, then you won't get the upcoming CSS styling support.
>> dave
>> (hyatt at apple.com)
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>> webkit-dev at lists.webkit.org
>> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev

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