From b264b1ddc4c83cf8ba8b08a6e171d6834352ef67 2012-04-23 11:20:52
From: Jani Honkonen <jani.honkonen@digia.com>
Date: 2012-04-23 11:20:52
Subject: [PATCH] Emit hover leave signal from PieSliceItem when it gets destroyed.

This fixes the problem with the drilldown demo highlight getting stuck when switching series.

---

diff --git a/examples/piechartdrilldown/drilldownslice.cpp b/examples/piechartdrilldown/drilldownslice.cpp
index f375f02..c0cbe05 100644
--- a/examples/piechartdrilldown/drilldownslice.cpp
+++ b/examples/piechartdrilldown/drilldownslice.cpp
@@ -57,6 +57,7 @@ void DrilldownSlice::updateLabel()
 void DrilldownSlice::showHighlight(bool show)
 {
     setLabelVisible(show);
+    setExploded(show);
 }
 
 #include "moc_drilldownslice.cpp"
diff --git a/src/piechart/piesliceitem.cpp b/src/piechart/piesliceitem.cpp
index f59969d..94f076b 100644
--- a/src/piechart/piesliceitem.cpp
+++ b/src/piechart/piesliceitem.cpp
@@ -40,7 +40,8 @@ QPointF offset(qreal angle, qreal length)
 }
 
 PieSliceItem::PieSliceItem(QGraphicsItem* parent)
-    :QGraphicsObject(parent)
+    :QGraphicsObject(parent),
+    m_hovered(false)
 {
     setAcceptHoverEvents(true);
     setAcceptedMouseButtons(Qt::MouseButtonMask);
@@ -49,7 +50,10 @@ PieSliceItem::PieSliceItem(QGraphicsItem* parent)
 
 PieSliceItem::~PieSliceItem()
 {
-
+    // If user is hovering over the slice and it gets destroyed we do
+    // not get a hover leave event. So we must emit the signal here.
+    if (m_hovered)
+        emit hovered(false);
 }
 
 QRectF PieSliceItem::boundingRect() const
@@ -85,11 +89,13 @@ void PieSliceItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* /*op
 
 void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent* /*event*/)
 {
+    m_hovered = true;
     emit hovered(true);
 }
 
 void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent* /*event*/)
 {
+    m_hovered = false;
     emit hovered(false);
 }
 
diff --git a/src/piechart/piesliceitem_p.h b/src/piechart/piesliceitem_p.h
index 8e338d7..4a9d095 100644
--- a/src/piechart/piesliceitem_p.h
+++ b/src/piechart/piesliceitem_p.h
@@ -72,6 +72,7 @@ private:
     QPainterPath m_slicePath;
     QPainterPath m_labelArmPath;
     QRectF m_labelTextRect;
+    bool m_hovered;
 };
 
 QTCOMMERCIALCHART_END_NAMESPACE