This affects TouchEvents generated via low-level native touch events,
including those generated by a trackpad. GestureEvents still work. In
particular, the HelloGestures app still works: even with low-level touch
events disabled, I can use the trackpad to rotate and zoom and the app
picks it up fine.
Mouse events, including trackpad scrolling events, are not affected at
all by this.
-- Kevin
On 1/30/2020 9:31 AM, Michael Paus wrote:
Just to clarify the implications of this issue: Are you only talking
about the JavaFX TouchEvents
or would disabling them also affect all GestureEvents and synthesized
MouseEvents when you are
working with a trackpad?
Am 30.01.20 um 17:47 schrieb Kevin Rushforth:
To: Mac app developers / users
I started looking into JDK-8231513 [1] -- "JavaFX cause Keystroke
Receiving prompt on MacOS 10.15 (Catalina)" -- a couple days ago. The
effect of this bug is that a scary dialog is shown for all users the
first time they run a JavaFX application and move the mouse is moved
into the JavaFX window. It also is reported to block apps from being
accepted in the Apple store.
This bug is caused by a change in macOS 10.15 to require additional
permissions for using CGEventTap, which JavaFX uses to track touch
events.
The suggested replacement API,
NSEvent::addLocalMonitorForEventsMatchingMask, works just differently
enough (it tracks events delivered to a specific view, whereas the
current code is implemented using a global monitor and a global set
of touch points), that it would be too risky to change it this late
in the release.
Since there isn't an easy / safe fix that is feasible for JavaFX 14,
I wanted to get some input from Mac users on the list. I can think of
the following possibilities for JavaFX 14:
1. Do nothing (defer the bug to FX 15)
2. Disable touch events completely if running on macOS 10.15 (or
later) -- we could consider a system property to re-enable it, but I
don't really like that idea, and I'm not sure how useful it would be
anyway since setting that flag would cause the scary dialog again.
3. Defer enabling of touch events until the first time the
application requests them -- this would require new interfaces in
Glass, isn't risk free, and doesn't solve the dialog problem for
those apps that do use touch.
I'm leaning towards option #2 (without the system property to force
enable it), but wanted to get a sense from app developers as to
whether that would be more of a problem than doing nothing (i.e.,
option #1). I only listed option #3 for completeness, since it
doesn't really solve the issue.
Whatever we do for 14, the solution for 15 will very likely be to
switch to tracking per-View (per Window) touch events, either
directly, or maybe using local event monitoring.
-- Kevin
[1] https://bugs.openjdk.java.net/browse/JDK-8231513
