Tablet device_information manual test: show wheel events received

We have a bug that proximity events are generating them spuriously;
this is a way of testing it.

Task-number: QTBUG-52921
Change-Id: I490dfcf8d5b325f612b733e29fd49de9418bb19e
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

tests/manual/qtabletevent/device_information/tabletwidget.cpp

@@ -38,7 +38,7 @@
 #include <QMetaObject>
 #include <QMetaEnum>
 
-TabletWidget::TabletWidget(bool mouseToo) : mMouseToo(mouseToo)
+TabletWidget::TabletWidget(bool mouseToo) : mMouseToo(mouseToo), mWheelEventCount(0)
 {
     QPalette newPalette = palette();
     newPalette.setColor(QPalette::Window, Qt::white);
@@ -87,6 +87,10 @@ bool TabletWidget::eventFilter(QObject *, QEvent *ev)
             mGPos = event->globalPos();
             mTimestamp = event->timestamp();
         }
+        break;
+    case QEvent::Wheel:
+        ++mWheelEventCount;
+        break;
     default:
         break;
     }
@@ -181,6 +185,8 @@ void TabletWidget::paintEvent(QPaintEvent *)
         eventInfo << QString("z: %1").arg(QString::number(mZ));
 
         eventInfo << QString("Unique Id: %1").arg(QString::number(mUnique));
+
+        eventInfo << QString("Total wheel events: %1").arg(QString::number(mWheelEventCount));
     }
 
     QString text = eventInfo.join("\n");

tests/manual/qtabletevent/device_information/tabletwidget.h

@@ -66,6 +66,7 @@ private:
     qint64 mUnique;
     bool mMouseToo;
     ulong mTimestamp;
+    int mWheelEventCount;
 };
 
 #endif // TABLETWIDGET_H