340585 - Scrollwheel has no impact on popup window

Status: RESOLVED FIXED

(Core :: Widget: Cocoa, defect)

Description

[Mark Mentovai]

The scroll wheel has no impact on popup windows in Cocoafox.  Scroll events that occur over a popup window don't cause anything to scroll.  This is most likely because popup windows are inactive.  See also bug 339447.

Testcase: Open an autocomplete dropdown popup that is scrollable, position the pointer over it, and manipulate your scrollwheel or whiz-bang two-finger touchpad,   Expected behavior: it should scroll.  Observed behavior: it doesn't.  This is NOT Carbonfox bug 339705.

Comment 2

[Colin Barrett [:cbarrett]]

So it turns out this is due to Cocoa being lame.

You only get scrollWheel: events for windows which are key. Making out popup window key is a non solution as it causes the titlebar of the window to change.

It seems like installing a carbon event handler for kMouseWheelMoved would work if we installed it against the EventDispatcher target. We might be able to get it to work with just the Window target, but I don't know if these same things happen or not -- I haven't tested it yet.

Advice welcome.

Comment 3

[Steven Michaud [:smichaud] (Retired)]

Fixed by patch for bug 387164, which just landed on trunk.