From a36b7045f9436c13fb8c31dcdb39de83438eacd9 Mon Sep 17 00:00:00 2001
From: "Aaron J. Seigo" <aseigo@kde.org>
Date: Mon, 31 Aug 2009 10:13:44 +0000
Subject: [PATCH] track item deletion as well

svn path=/trunk/KDE/kdelibs/; revision=1017735
---
 widgets/itembackground.cpp | 30 ++++++++++++++++++++++++++++++
 widgets/itembackground.h   |  4 +++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/widgets/itembackground.cpp b/widgets/itembackground.cpp
index 9924c4ed3..3b038a7be 100644
--- a/widgets/itembackground.cpp
+++ b/widgets/itembackground.cpp
@@ -39,6 +39,7 @@ public:
     {}
 
     void animationUpdate(qreal progress);
+    void targetDestroyed(QObject*);
 
     ItemBackground *q;
     QGraphicsItem *target;
@@ -110,6 +111,17 @@ void ItemBackground::setTargetItem(QGraphicsItem *target)
 {
     if (d->target && d->target != target) {
         d->target->removeSceneEventFilter(this);
+
+        QObject *obj = 0;
+        if (target->isWidget()) {
+            obj = static_cast<QGraphicsWidget*>(target);
+        } else {
+            obj = dynamic_cast<QObject *>(target);
+        }
+
+        if (obj) {
+            disconnect(obj, 0, obj, 0);
+        }
     }
 
     if (target) {
@@ -119,9 +131,22 @@ void ItemBackground::setTargetItem(QGraphicsItem *target)
 
         if (d->target != target) {
             d->target = target;
+
             d->target->installSceneEventFilter(this);
+
+            QObject *obj = 0;
+            if (target->isWidget()) {
+                obj = static_cast<QGraphicsWidget*>(target);
+            } else {
+                obj = dynamic_cast<QObject *>(target);
+            }
+
+            if (obj) {
+                connect(obj, SIGNAL(destroyed(QObject*)), this, SLOT(targetDestroyed(QObject*)));
+            }
         }
     } else {
+        d->target = 0;
         hide();
     }
 }
@@ -209,6 +234,11 @@ void ItemBackgroundPrivate::animationUpdate(qreal progress)
     q->update();
 }
 
+void ItemBackgroundPrivate::targetDestroyed(QObject*)
+{
+    q->setTargetItem(0);
+}
+
 }
 
 #include "itembackground.moc"
diff --git a/widgets/itembackground.h b/widgets/itembackground.h
index 016555b8d..9ef1b5552 100644
--- a/widgets/itembackground.h
+++ b/widgets/itembackground.h
@@ -73,8 +73,10 @@ protected:
     bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);
 
 private:
-    ItemBackgroundPrivate * const d;
     Q_PRIVATE_SLOT(d, void animationUpdate(qreal progress))
+    Q_PRIVATE_SLOT(d, void targetDestroyed(QObject*))
+
+    ItemBackgroundPrivate * const d;
 };
 }