From 862236dc7cdff27305c4a3ade9c802eafce03c80 Mon Sep 17 00:00:00 2001
From: Bjoern Erik Nilsen <bjorn.nilsen@nokia.com>
Date: Wed, 15 Jul 2009 18:04:23 +0200
Subject: QGraphicsItems not painted after QGraphicsScene::clear().

The problem was that we didn't regenerate the bsp when adding
items after calling QGraphicsScene::clear.

Reviewed-by: alexis
---
 .../graphicsview/qgraphicsscenebsptreeindex.cpp    |  1 +
 .../tst_qgraphicssceneindex.cpp                    | 34 ++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
index a54ade9..110e892 100644
--- a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
+++ b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
@@ -542,6 +542,7 @@ void QGraphicsSceneBspTreeIndex::clear()
     d->indexedItems.clear();
     d->unindexedItems.clear();
     d->untransformableItems.clear();
+    d->regenerateIndex = true;
 }
 
 /*!
diff --git a/tests/auto/qgraphicssceneindex/tst_qgraphicssceneindex.cpp b/tests/auto/qgraphicssceneindex/tst_qgraphicssceneindex.cpp
index 3ce5b16..7a00e60 100644
--- a/tests/auto/qgraphicssceneindex/tst_qgraphicssceneindex.cpp
+++ b/tests/auto/qgraphicssceneindex/tst_qgraphicssceneindex.cpp
@@ -66,6 +66,7 @@ private slots:
     void movingItems();
     void connectedToSceneRectChanged();
     void items();
+    void clear();
 
 private:
     void common_data();
@@ -267,5 +268,38 @@ void tst_QGraphicsSceneIndex::items()
     QCOMPARE(scene.items().size(), 3);
 }
 
+void tst_QGraphicsSceneIndex::clear()
+{
+    class MyItem : public QGraphicsItem
+    {
+    public:
+        MyItem(QGraphicsItem *parent = 0) : QGraphicsItem(parent), numPaints(0) {}
+        int numPaints;
+    protected:
+        QRectF boundingRect() const { return QRectF(0, 0, 10, 10); }
+        void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+        { ++numPaints; }
+    };
+
+    QGraphicsScene scene;
+    scene.setSceneRect(0, 0, 100, 100);
+    scene.addItem(new MyItem);
+
+    QGraphicsView view(&scene);
+    view.show();
+#ifdef Q_WS_X11
+    qt_x11_wait_for_window_manager(&view);
+#endif
+    QTest::qWait(250);
+    scene.clear();
+
+    // Make sure the index is re-generated after QGraphicsScene::clear();
+    // otherwise no items will be painted.
+    MyItem *item = new MyItem;
+    scene.addItem(item);
+    qApp->processEvents();
+    QCOMPARE(item->numPaints, 1);
+}
+
 QTEST_MAIN(tst_QGraphicsSceneIndex)
 #include "tst_qgraphicssceneindex.moc"
-- 
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