2 files changed, 61 insertions, 2 deletions

diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp
index ccbf7fc..2be6a49 100644
--- a/src/gui/effects/qgraphicseffect.cpp
+++ b/src/gui/effects/qgraphicseffect.cpp
@@ -349,6 +349,22 @@ void QGraphicsEffect::setEnabled(bool enable)
 */
 
 /*!
+    Schedules a redraw of the source. Call this function whenever the source
+    needs to be redrawn.
+
+    This convenience function is equivalent to calling
+    QGraphicsEffectSource::update().
+
+    \sa updateBoundingRect(), QGraphicsEffectSource::update()
+*/
+void QGraphicsEffect::update()
+{
+    Q_D(QGraphicsEffect);
+    if (d->source)
+        d->source->update();
+}
+
+/*!
     Returns a pointer to the source, which provides extra context information
     that can be useful for the effect.
 
@@ -366,6 +382,8 @@ QGraphicsEffectSource *QGraphicsEffect::source() const
     function whenever you change any parameters that will cause the virtual
     boundingRectFor() function to return a different value.
 
+    This function will call update() if this is necessary.
+
     \sa boundingRectFor(), boundingRect()
 */
 void QGraphicsEffect::updateBoundingRect()
@@ -523,6 +541,7 @@ void QGraphicsColorizeEffect::setColor(const QColor &color)
         return;
 
     d->filter->setColor(color);
+    update();
     emit colorChanged(color);
 }
 
@@ -610,6 +629,7 @@ void QGraphicsPixelizeEffect::setPixelSize(int size)
         return;
 
     d->pixelSize = size;
+    update();
     emit pixelSizeChanged(size);
 }
 
@@ -820,7 +840,7 @@ QGraphicsDropShadowEffect::~QGraphicsDropShadowEffect()
 
     By default, the offset is 8 pixels towards the lower right.
 
-    \sa blurRadius(), color()
+    \sa xOffset(), yOffset(), blurRadius(), color()
 */
 QPointF QGraphicsDropShadowEffect::offset() const
 {
@@ -840,6 +860,24 @@ void QGraphicsDropShadowEffect::setOffset(const QPointF &offset)
 }
 
 /*!
+    \property QGraphicsDropShadowEffect::xOffset
+    \brief the horizontal shadow offset in pixels.
+
+    By default, the horizontal shadow offset is 8 pixels.
+
+    \sa yOffset(), offset()
+*/
+
+/*!
+    \property QGraphicsDropShadowEffect::yOffset
+    \brief the vertical shadow offset in pixels.
+
+    By default, the vertical shadow offset is 8 pixels.
+
+    \sa xOffset(), offset()
+*/
+
+/*!
     \fn void QGraphicsDropShadowEffect::offsetChanged(const QPointF &offset)
 
     This signal is emitted whenever the effect's shadow offset changes.
@@ -903,6 +941,7 @@ void QGraphicsDropShadowEffect::setColor(const QColor &color)
         return;
 
     d->filter->setColor(color);
+    update();
     emit colorChanged(color);
 }
 
@@ -1012,6 +1051,7 @@ void QGraphicsOpacityEffect::setOpacity(qreal opacity)
         d->isFullyOpaque = 0;
     else
         d->isFullyOpaque = qFuzzyIsNull(d->opacity - 1);
+    update();
     emit opacityChanged(opacity);
 }
 
@@ -1050,6 +1090,7 @@ void QGraphicsOpacityEffect::setOpacityMask(const QBrush &mask)
 
     d->opacityMask = mask;
     d->hasOpacityMask = (mask.style() != Qt::NoBrush);
+    update();
 
     emit opacityMaskChanged(mask);
 }
diff --git a/src/gui/effects/qgraphicseffect.h b/src/gui/effects/qgraphicseffect.h
index 8e5384c..aee7834 100644
--- a/src/gui/effects/qgraphicseffect.h
+++ b/src/gui/effects/qgraphicseffect.h
@@ -118,7 +118,7 @@ public:
 
 public Q_SLOTS:
     void setEnabled(bool enable);
-    // ### add update() slot
+    void update();
 
 Q_SIGNALS:
     void enabledChanged(bool enabled);
@@ -237,6 +237,8 @@ class Q_GUI_EXPORT QGraphicsDropShadowEffect: public QGraphicsEffect
 {
     Q_OBJECT
     Q_PROPERTY(QPointF offset READ offset WRITE setOffset NOTIFY offsetChanged)
+    Q_PROPERTY(qreal xOffset READ xOffset WRITE setXOffset NOTIFY offsetChanged)
+    Q_PROPERTY(qreal yOffset READ yOffset WRITE setYOffset NOTIFY offsetChanged)
     Q_PROPERTY(int blurRadius READ blurRadius WRITE setBlurRadius NOTIFY blurRadiusChanged)
     Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)
 public:
@@ -245,15 +247,31 @@ public:
 
     QRectF boundingRectFor(const QRectF &rect) const;
     QPointF offset() const;
+
+    inline qreal xOffset() const
+    { return offset().x(); }
+
+    inline qreal yOffset() const
+    { return offset().y(); }
+
     int blurRadius() const;
     QColor color() const;
 
 public Q_SLOTS:
     void setOffset(const QPointF &ofs);
+
     inline void setOffset(qreal dx, qreal dy)
     { setOffset(QPointF(dx, dy)); }
+
     inline void setOffset(qreal d)
     { setOffset(QPointF(d, d)); }
+
+    inline void setXOffset(qreal dx)
+    { setOffset(QPointF(dx, yOffset())); }
+
+    inline void setYOffset(qreal dy)
+    { setOffset(QPointF(xOffset(), dy)); }
+
     void setBlurRadius(int blurRadius);
     void setColor(const QColor &color);