make the QTouchDevice available in each QNativeGestureEvent

QtQuick is beginning to have a use for this, to distinguish native
gestures which come from actual trackpad rather than from the "core pointer".
It might as well use a real device ID instead of making one up,
as it has to do for the core pointer.

So far on macOS, the device ID isn't a real one; but that can be fixed,
as the qCDebug lines demonstrate (different trackpads have different IDs).

Change-Id: I5841deb1c4cc0b77a3b1df70904f70b3d2d71853
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gui/kernel/qtouchdevice_p.h b/src/gui/kernel/qtouchdevice_p.h
index 18d2af46a7..fc45066c2d 100644
--- a/src/gui/kernel/qtouchdevice_p.h
+++ b/src/gui/kernel/qtouchdevice_p.h
@@ -78,6 +78,7 @@ public:
     static void registerDevice(const QTouchDevice *dev);
     static void unregisterDevice(const QTouchDevice *dev);
     static bool isRegistered(const QTouchDevice *dev);
+    static const QTouchDevice *deviceById(quint8 id);
     static QTouchDevicePrivate *get(QTouchDevice *q) { return q->d; }
 };