Unfortunately there is no realiable way to tell whether there is no mouse
connected or not. So we are going to take a heuristic way here. The way is
that;
1) Count mouse type devices with SetupDiEnumDeviceInterfaces [1]
2) If the count is 1 and if the system is used as tablet or has a touch device,
the device should be COARSE
This way causes a misrecognition as if there is a mouse device in the case
where the touchscreen is disabled on the tablet even if there is no mouse
connected (i.e. the case where CountMouseDevices() returns 1 and the system
is on table mode). We will try to fix the misrecognition in a later bug
(bug 1495938).
[1] https://docs.microsoft.com/en-us/windows/desktop/api/setupapi/nf-setupapi-setupdienumdeviceinterfaces
Differential Revision: https://phabricator.services.mozilla.com/D7565
--HG--
extra : moz-landing-system : lando
Unfortunately there is no realiable way to tell whether there is no mouse
connected or not. So we are going to take a heuristic way here. The way is
that;
1) Count mouse type devices with SetupDiEnumDeviceInterfaces [1]
2) If the count is 1 and if the system is used as tablet or has a touch device,
the device should be COARSE
This way causes a misrecognition as if there is a mouse device in the case
where the touchscreen is disabled on the tablet even if there is no mouse
connected (i.e. the case where CountMouseDevices() returns 1 and the system
is on table mode). We will try to fix the misrecognition in a later bug
(bug 1495938).
[1] https://docs.microsoft.com/en-us/windows/desktop/api/setupapi/nf-setupapi-setupdienumdeviceinterfaces
Differential Revision: https://phabricator.services.mozilla.com/D7565
--HG--
extra : moz-landing-system : lando
Note that this dynamic change will not work without a patch for bug 1478576
if user doesn't touch browser windows.
Differential Revision: https://phabricator.services.mozilla.com/D3301
Sylvestre Ledru
Hiroyuki Ikezoe
Brindusan Cristian