297095 - Native scrollbars don't fire events

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Widget: Mac, defect)

Description

[jhp (no longer active)]

When using the default theme, which uses native scrollbars on Mac, mouse events
related to the scrollbar are not fired.  Works fine on other themes that use XUL
scrollbars.  See attached testcase.

Comment 1

[jhp (no longer active)]

Attachment: testcase

Comment 2

[jhp (no longer active)]

So it looks like native scrollbars do fire events, just not the ones this
testcase is looking for.  Specifically, a "mousemove" event is fired with the
target of "nativescrollbar".  The "mousedown" event is consumed by the
|eatEvent| code in |nsNativeScrollbar::DispatchMouseEvent()|.  "mouseup" is
similarly consumed in |nsMacControl::DispatchMouseEvent()|.

However, I'm not sure how to synthesize the appropriate events to point to the
correct XUL parts (i.e. "scrollbarbutton", "thumb", "slider", "scrollbar").

Comment 3

[Simon Fraser [no longer active]]

Also covered by bug 276142.

Comment 4

[Simon Fraser [no longer active]]

This is pretty serious; it can totally break some custom sites that rely on
scrollbar events.

Comment 5

[jhp (no longer active)]

I'm not sure how serious this is.  According to Neil in bug 276142, there's no
actual API for this kind of stuff, and we do different things on different
platforms.  Is this just the case that some sites are taking advantage of this
because it happens to work on windows?

Comment 6

[Mark Mentovai]

In 1.0, I see the scrollbar, complete with thumb and buttons, but no events fire.

On the trunk and 1.8 branch, all I see is the scrollbar track.  No thumb or
buttons, and of course, no events.