741283 - when a menu is open, buttons and links appear active when they are not

Status: NEW

(Core :: XUL, defect)

Description

[Karl Tomlinson (:karlt)]

STR:
1) Open a menu on the menu bar, or a context menu, or the "List all tabs" dropdown.
2) Hover the pointer over a link or toolbar button.

Expected results: nothing.
Actual results: the link or button highlights as if it is active.

Clicking the mouse button while the pointer is over an apparently active object does nothing.  This is the correct behavior when nsIWidget::CaptureRollupEvents has been called with aConsumeRollupEvent set.

Comment 1

[Karl Tomlinson (:karlt)]

This bug can't reasonably be fixed (solely) from widget code because preventing the main window from receiving events would prevent the menubar from knowing when to switch from one menu to another (e.g. "File" to "Edit")

Comment 2

[Karl Tomlinson (:karlt)]

I wonder whether the menubar/menu could use https://developer.mozilla.org/en/API/Pointer_Lock_API

Comment 3

[Olli Pettay [:smaug][[e-mail]]]

Pointer lock wouldn't work. It hides the cursor and changes mouse event handling etc.

Comment 4

[Karl Tomlinson (:karlt)]

pointer-events: none doesn't seem right here as descendants can override that, but perhaps a capturing event listener on a high-level element can stop propagation.
I guess it could check whether the target is the menubar to allow events there, if the menubar is a descendant element.

Or perhaps an invisible element could be thrown on top of the non-menu bar part of the window.  It could even usually have pointer-events: none set so as to have no effect, but that would be changed when the menubar has been opened.

Both feel a little awkward, but I'm leaning towards the former.