1495938 - Find out a reliable way to tell there is no mouse on Microsoft Surface

Status: RESOLVED WORKSFORME

(Core :: Widget: Win32, defect, P5)

Description

[Hiroyuki Ikezoe (:hiro)]

+++ This bug was initially created as a clone of Bug #1493128 +++

In bug 143128 we discovered that all of GetSystemMetrics(SM_MOUSEPRESENT), SetupDiEnumDeviceInterfaces[1] and GetPointerDevices[2] returns there is a mouse even if no mouse device is connected to the Surface.  As far as I can tell there is no way to tell that.

This bug is for a future work once Microsoft provides the way (or we find the way).

[1] https://docs.microsoft.com/en-us/windows/desktop/api/setupapi/nf-setupapi-setupdienumdeviceinterfaces
[2] https://docs.microsoft.com/en-us/uwp/api/windows.devices.input.pointerdevice.getpointerdevices

Comment 1

[Hiroyuki Ikezoe (:hiro)]

Oops, for the record I did also try MouseCapabilities [1] in bug 1493128, it didn't work either. 

[1] https://docs.microsoft.com/en-us/uwp/api/windows.devices.input.mousecapabilities

Comment 2

[Daniel Bodea [:danibodea]]

It appears that the latest fix for bug 1493128 also fixed this issue. 
When the mouse remains the last pointing device on the system and then it gets removed, the test page displays "none" to all as expected. Can it be marked as RESOLVED? 

Thank you!

Comment 3

[Hiroyuki Ikezoe (:hiro)]

Sure!  We can close this bug.  Thanks Bodea!

Comment 4

[Louis Semprini]

Hi Hiroyuki! This change broke the CSS Media "pointer" and "any-pointer" Query on Windows 10 laptops with a trackpad and without a mouse (they incorrectly return pointer: coarse instead of the pointer: fine that the spec requires for trackpads/touchpads as opposed to tablet touchscreens).

Please see the details at: https://bugzilla.mozilla.org/show_bug.cgi?id=1638556

Thanks!