From ecd9c29a964186d079c569b74f4ca9cf12ae5901 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <samuel.rodal@nokia.com>
Date: Tue, 3 May 2011 16:41:18 +0200
Subject: [PATCH] Wheel event forwarding.

---
 src/gui/kernel/qwidgetwindow_qpa.cpp | 18 ++++++++++++++++++
 src/gui/kernel/qwidgetwindow_qpa_p.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/src/gui/kernel/qwidgetwindow_qpa.cpp b/src/gui/kernel/qwidgetwindow_qpa.cpp
index b5bc50c76d..fc49b30417 100644
--- a/src/gui/kernel/qwidgetwindow_qpa.cpp
+++ b/src/gui/kernel/qwidgetwindow_qpa.cpp
@@ -77,6 +77,10 @@ bool QWidgetWindow::event(QEvent *event)
         handleResizeEvent(static_cast<QResizeEvent *>(event));
         return true;
 
+    case QEvent::Wheel:
+        handleWheelEvent(static_cast<QWheelEvent *>(event));
+        return true;
+
     default:
         break;
     }
@@ -127,4 +131,18 @@ void QWidgetWindow::handleCloseEvent(QCloseEvent *)
     m_widget->d_func()->close_helper(QWidgetPrivate::CloseWithSpontaneousEvent);
 }
 
+void QWidgetWindow::handleWheelEvent(QWheelEvent *event)
+{
+    // which child should have it?
+    QWidget *widget = m_widget->childAt(event->pos());
+
+    if (!widget)
+        widget = m_widget;
+
+    QPoint mapped = widget->mapFrom(m_widget, event->pos());
+
+    QWheelEvent translated(mapped, event->globalPos(), event->delta(), event->buttons(), event->modifiers(), event->orientation());
+    QGuiApplication::sendSpontaneousEvent(widget, &translated);
+}
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qwidgetwindow_qpa_p.h b/src/gui/kernel/qwidgetwindow_qpa_p.h
index 37c9f383ea..0780af1c72 100644
--- a/src/gui/kernel/qwidgetwindow_qpa_p.h
+++ b/src/gui/kernel/qwidgetwindow_qpa_p.h
@@ -68,6 +68,7 @@ protected:
     void handleMouseEvent(QMouseEvent *);
     void handleMoveEvent(QMoveEvent *);
     void handleResizeEvent(QResizeEvent *);
+    void handleWheelEvent(QWheelEvent *);
 
 private:
     QWidget *m_widget;