Unify input device hotplugging support for embedded

On embedded the mouse cursor will now appear and reappear regardless of
how the input handling code is loaded (via a generic plugin or compiled-in
to the platform plugin).

Instead of passing around QDeviceDiscovery instances that only works
when compiling-in the code into the platform plugin, introduce a new
internal central QInputDeviceManager. The single instance of this
provides a place to store any future input device related signals and
properties.

Also introduce mouse hotplugging support to linuxfb.

[ChangeLog][QtGui] The mouse cursor on Embedded Linux is now handling
hotplugging correctly with eglfs and linuxfb regardless of how the input
handling code is loaded (via a generic plugin or built in to the platform
plugin).

Change-Id: I147c1b04a193baf216598015264f2c06e1b20f84
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication_p.h b/src/gui/kernel/qguiapplication_p.h
index 8b444e1d34..471316d7ed 100644
--- a/src/gui/kernel/qguiapplication_p.h
+++ b/src/gui/kernel/qguiapplication_p.h
@@ -66,6 +66,7 @@ struct QDrawHelperGammaTables;
 #ifndef QT_NO_DRAGANDDROP
 class QDrag;
 #endif // QT_NO_DRAGANDDROP
+class QInputDeviceManager;
 
 class Q_GUI_EXPORT QGuiApplicationPrivate : public QCoreApplicationPrivate
 {
@@ -272,6 +273,8 @@ public:
 
     static Qt::MouseEventSource wheelEventSource(const QWheelEvent *event);
 
+    static QInputDeviceManager *inputDeviceManager();
+
     const QDrawHelperGammaTables *gammaTables();
 
     // hook reimplemented in QApplication to apply the QStyle function on the QIcon
@@ -301,6 +304,8 @@ private:
     QAtomicPointer<QDrawHelperGammaTables> m_gammaTables;
 
     bool ownGlobalShareContext;
+
+    static QInputDeviceManager *m_inputDeviceManager;
 };
 
 Q_GUI_EXPORT uint qHash(const QGuiApplicationPrivate::ActiveTouchPointsKey &k);