4 files changed, 29 insertions, 2 deletions

diff --git a/src/gui/kernel/qapplication_s60.cpp b/src/gui/kernel/qapplication_s60.cpp
index 3ee0a71..8c77728 100644
--- a/src/gui/kernel/qapplication_s60.cpp
+++ b/src/gui/kernel/qapplication_s60.cpp
@@ -807,6 +807,15 @@ TCoeInputCapabilities QSymbianControl::InputCapabilities() const
 
 void QSymbianControl::Draw(const TRect& controlRect) const
 {
+    // Set flag to avoid calling DrawNow in window surface
+    QWExtra *extra = qwidget->d_func()->extraData();
+    if (extra && !extra->inExpose) {
+        extra->inExpose = true;
+        QRect exposeRect = qt_TRect2QRect(controlRect);
+        qwidget->d_func()->syncBackingStore(exposeRect);
+        extra->inExpose = false;
+    }
+
     QWindowSurface *surface = qwidget->windowSurface();
     QPaintEngine *engine = surface ? surface->paintDevice()->paintEngine() : NULL;
 
@@ -855,8 +864,6 @@ void QSymbianControl::Draw(const TRect& controlRect) const
         default:
             Q_ASSERT(false);
         }
-    } else {
-        surface->flush(qwidget, QRegion(qt_TRect2QRect(backingStoreRect)), QPoint());
     }
 
     if (sendNativePaintEvents) {
diff --git a/src/gui/kernel/qdesktopwidget.cpp b/src/gui/kernel/qdesktopwidget.cpp
index c8a4373..24b4e57 100644
--- a/src/gui/kernel/qdesktopwidget.cpp
+++ b/src/gui/kernel/qdesktopwidget.cpp
@@ -47,6 +47,11 @@ QT_BEGIN_NAMESPACE
 
 const QRect QDesktopWidget::screenGeometry(const QWidget *widget) const
 {
+    if (!widget) {
+        qWarning("QDesktopWidget::screenGeometry(): Attempt "
+                 "to get the screen geometry of a null widget");
+        return QRect();
+    }
     QRect rect = QWidgetPrivate::screenGeometry(widget);
     if (rect.isNull())
         return screenGeometry(screenNumber(widget));
@@ -55,6 +60,11 @@ const QRect QDesktopWidget::screenGeometry(const QWidget *widget) const
 
 const QRect QDesktopWidget::availableGeometry(const QWidget *widget) const
 {
+    if (!widget) {
+        qWarning("QDesktopWidget::availableGeometry(): Attempt "
+                 "to get the available geometry of a null widget");
+        return QRect();
+    }
     QRect rect = QWidgetPrivate::screenGeometry(widget);
     if (rect.isNull())
         return availableGeometry(screenNumber(widget));
diff --git a/src/gui/kernel/qwidget_p.h b/src/gui/kernel/qwidget_p.h
index ec8d20f..b1eb3c3 100644
--- a/src/gui/kernel/qwidget_p.h
+++ b/src/gui/kernel/qwidget_p.h
@@ -229,6 +229,7 @@ struct QWExtra {
 #endif
 #elif defined(Q_OS_SYMBIAN) // <----------------------------------------------------- Symbian
     uint activated : 1; // RWindowBase::Activated has been called
+    uint inExpose : 1; // Prevents drawing recursion
 
     /**
      * Defines the behaviour of QSymbianControl::Draw.
diff --git a/src/gui/kernel/qwidget_s60.cpp b/src/gui/kernel/qwidget_s60.cpp
index c65a162..00f2213 100644
--- a/src/gui/kernel/qwidget_s60.cpp
+++ b/src/gui/kernel/qwidget_s60.cpp
@@ -389,9 +389,13 @@ void QWidgetPrivate::create_sys(WId window, bool /* initializeWindow */, bool de
 
             if (!isOpaque) {
                 RWindow *const window = static_cast<RWindow *>(drawableWindow);
+#ifdef Q_SYMBIAN_SEMITRANSPARENT_BG_SURFACE
+                window->SetSurfaceTransparency(true);
+#else
                 const TDisplayMode displayMode = static_cast<TDisplayMode>(window->SetRequiredDisplayMode(EColor16MA));
                 if (window->SetTransparencyAlphaChannel() == KErrNone)
                     window->SetBackgroundColor(TRgb(255, 255, 255, 0));
+#endif
             }
         }
 
@@ -707,12 +711,16 @@ void QWidgetPrivate::s60UpdateIsOpaque()
 
     RWindow *const window = static_cast<RWindow *>(q->effectiveWinId()->DrawableWindow());
 
+#ifdef Q_SYMBIAN_SEMITRANSPARENT_BG_SURFACE
+    window->SetSurfaceTransparency(!isOpaque);
+#else
     if (!isOpaque) {
         const TDisplayMode displayMode = static_cast<TDisplayMode>(window->SetRequiredDisplayMode(EColor16MA));
         if (window->SetTransparencyAlphaChannel() == KErrNone)
             window->SetBackgroundColor(TRgb(255, 255, 255, 0));
     } else
         window->SetTransparentRegion(TRegionFix<1>());
+#endif
 }
 
 void QWidgetPrivate::setWindowIcon_sys(bool forceReset)
@@ -883,6 +891,7 @@ void QWidgetPrivate::createSysExtra()
     extra->activated = 0;
     extra->nativePaintMode = QWExtra::Default;
     extra->receiveNativePaintEvents = 0;
+    extra->inExpose = 0;
 }
 
 void QWidgetPrivate::deleteSysExtra()