evdevmouse: send correct event position for wheel events

The current position for mouse events is synchronized in the mousemanager,
thus the wheel event needs to pick the event position from there.

Change-Id: I1e73a0154b596885c7092f0a74e6dd448deb428c
Reviewed-by: Laszlo Agocs <laszlo.p.agocs@nokia.com>

src/platformsupport/input/evdevmouse/qevdevmousehandler.cpp

@@ -172,16 +172,12 @@ void QEvdevMouseHandler::readMouseData()
                 posChanged = true;
             } else if (data->code == ABS_WHEEL) { // vertical scroll
                 // data->value: 1 == up, -1 == down
-                int delta = 120 * data->value;
+                const int delta = 120 * data->value;
-                QWindowSystemInterface::handleWheelEvent(0, QPoint(m_x, m_y),
+                emit handleWheelEvent(delta, Qt::Vertical);
-                                                         QPoint(m_x, m_y),
-                                                         delta, Qt::Vertical);
             } else if (data->code == ABS_THROTTLE) { // horizontal scroll
                 // data->value: 1 == right, -1 == left
-                int delta = 120 * -data->value;
+                const int delta = 120 * -data->value;
-                QWindowSystemInterface::handleWheelEvent(0, QPoint(m_x, m_y),
+                emit handleWheelEvent(delta, Qt::Horizontal);
-                                                         QPoint(m_x, m_y),
-                                                         delta, Qt::Horizontal);
             }
         } else if (data->type == EV_KEY && data->code == BTN_TOUCH) {
             // We care about touchpads only, not touchscreens -> don't map to button press.

src/platformsupport/input/evdevmouse/qevdevmousehandler_p.h

@@ -60,6 +60,7 @@ public:
 
 signals:
     void handleMouseEvent(int x, int y, Qt::MouseButtons buttons);
+    void handleWheelEvent(int delta, Qt::Orientation orientation);
 
 private slots:
     void readMouseData();

src/platformsupport/input/evdevmouse/qevdevmousemanager.cpp

@@ -132,6 +132,16 @@ void QEvdevMouseManager::handleMouseEvent(int x, int y, Qt::MouseButtons buttons
 #endif
 }
 
+void QEvdevMouseManager::handleWheelEvent(int delta, Qt::Orientation orientation)
+{
+    QPoint pos(m_x + m_xoffset, m_y + m_yoffset);
+    QWindowSystemInterface::handleWheelEvent(0, pos, pos, delta, orientation);
+
+#ifdef QT_QPA_MOUSEMANAGER_DEBUG
+    qDebug("mouse wheel event %dx%d %d %d", pos.x(), pos.y(), delta, int(orientation));
+#endif
+}
+
 void QEvdevMouseManager::addMouse(const QString &deviceNode)
 {
 #ifdef QT_QPA_MOUSEMANAGER_DEBUG
@@ -142,6 +152,7 @@ void QEvdevMouseManager::addMouse(const QString &deviceNode)
     handler = QEvdevMouseHandler::create(deviceNode, m_spec);
     if (handler) {
         connect(handler, SIGNAL(handleMouseEvent(int, int, Qt::MouseButtons)), this, SLOT(handleMouseEvent(int, int, Qt::MouseButtons)));
+        connect(handler, SIGNAL(handleWheelEvent(int, Qt::Orientation)), this, SLOT(handleWheelEvent(int, Qt::Orientation)));
         m_mice.insert(deviceNode, handler);
     } else {
         qWarning("Failed to open mouse");

src/platformsupport/input/evdevmouse/qevdevmousemanager_p.h

@@ -63,6 +63,7 @@ public:
 
 public slots:
     void handleMouseEvent(int x, int y, Qt::MouseButtons buttons);
+    void handleWheelEvent(int delta, Qt::Orientation orientation);
 
 private slots:
     void addMouse(const QString &deviceNode = QString());