Client: Add basic support for tablet-unstable-v2

[ChangeLog][QPA plugin] Added support for drawing tablets through the
tablet-unstable-v2 protocol.

Adds support for the basic one tablet, one tool, no pads scenario.

Besides the auto tests, I tested with a Huion Kamvas Pro 16 with a simple
pressure sensitive pen with two buttons. As far as I can tell, it works the
same way as on xcb on Sway and Gnome Shell.

Also tested on a Wacom PTZ-630 with a mouse, art pen, airbrush and a stylus.

Mapped the distance event to QTabletEvent::Z and slider to
QTabletEvent::tangentialPressure.

For now we send QTabletEvents even when there's a mouse or finger on the
tablet. Those should ideally be sent as QMouseEvents/QTouchEvents, but that's
out of scope for this patch, but at least we will send synthesized mouse events
if the tablet events are not accepted.

Change-Id: I93291ffa5f00fa2bb8533eddd8d873b84a3386b8
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/client/qwaylanddisplay_p.h b/src/client/qwaylanddisplay_p.h
index cd845b44..e99ec198 100644
--- a/src/client/qwaylanddisplay_p.h
+++ b/src/client/qwaylanddisplay_p.h
@@ -97,6 +97,7 @@ class QWaylandDataDeviceManager;
 #if QT_CONFIG(wayland_client_primary_selection)
 class QWaylandPrimarySelectionDeviceManagerV1;
 #endif
+class QWaylandTabletManagerV2;
 class QWaylandTouchExtension;
 class QWaylandQtKeyExtension;
 class QWaylandWindow;
@@ -160,6 +161,7 @@ public:
     QWaylandPrimarySelectionDeviceManagerV1 *primarySelectionManager() const { return mPrimarySelectionManager.data(); }
 #endif
     QtWayland::qt_surface_extension *windowExtension() const { return mWindowExtension.data(); }
+    QWaylandTabletManagerV2 *tabletManager() const { return mTabletManager.data(); }
     QWaylandTouchExtension *touchExtension() const { return mTouchExtension.data(); }
     QtWayland::zwp_text_input_manager_v2 *textInputManager() const { return mTextInputManager.data(); }
     QWaylandHardwareIntegration *hardwareIntegration() const { return mHardwareIntegration.data(); }
@@ -247,6 +249,7 @@ private:
     QScopedPointer<QWaylandTouchExtension> mTouchExtension;
     QScopedPointer<QWaylandQtKeyExtension> mQtKeyExtension;
     QScopedPointer<QWaylandWindowManagerIntegration> mWindowManagerIntegration;
+    QScopedPointer<QWaylandTabletManagerV2> mTabletManager;
 #if QT_CONFIG(wayland_client_primary_selection)
     QScopedPointer<QWaylandPrimarySelectionDeviceManagerV1> mPrimarySelectionManager;
 #endif