Don't crash if a ScriptAction changes state mid-transition.

Change-Id: Ia85cb128c7410e2276bf4da02f946d3d0bf44989
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

src/qml/animations/qsequentialanimationgroupjob.cpp

@@ -142,20 +142,21 @@ void QSequentialAnimationGroupJob::advanceForwards(const AnimationIndex &newAnim
     if (m_previousLoop < m_currentLoop) {
         // we need to fast forward to the end
         for (QAbstractAnimationJob *anim = m_currentAnimation; anim; anim = anim->nextSibling()) {
-            setCurrentAnimation(anim, true);
+            RETURN_IF_DELETED(setCurrentAnimation(anim, true));
             RETURN_IF_DELETED(anim->setCurrentTime(animationActualTotalDuration(anim)));
         }
         // this will make sure the current animation is reset to the beginning
-        if (firstChild() && !firstChild()->nextSibling())   //count == 1
+        if (firstChild() && !firstChild()->nextSibling()) {   //count == 1
             // we need to force activation because setCurrentAnimation will have no effect
-            activateCurrentAnimation();
-        else
-            setCurrentAnimation(firstChild(), true);
+            RETURN_IF_DELETED(activateCurrentAnimation());
+        } else {
+            RETURN_IF_DELETED(setCurrentAnimation(firstChild(), true));
+        }
     }
 
     // and now we need to fast forward from the current position to
     for (QAbstractAnimationJob *anim = m_currentAnimation; anim && anim != newAnimationIndex.animation; anim = anim->nextSibling()) {     //### WRONG,
-        setCurrentAnimation(anim, true);
+        RETURN_IF_DELETED(setCurrentAnimation(anim, true));
         RETURN_IF_DELETED(anim->setCurrentTime(animationActualTotalDuration(anim)));
     }
     // setting the new current animation will happen later
@@ -166,21 +167,21 @@ void QSequentialAnimationGroupJob::rewindForwards(const AnimationIndex &newAnima
     if (m_previousLoop > m_currentLoop) {
         // we need to fast rewind to the beginning
         for (QAbstractAnimationJob *anim = m_currentAnimation; anim; anim = anim->previousSibling()) {
-            setCurrentAnimation(anim, true);
+            RETURN_IF_DELETED(setCurrentAnimation(anim, true));
             RETURN_IF_DELETED(anim->setCurrentTime(0));
         }
         // this will make sure the current animation is reset to the end
-        if (lastChild() && !lastChild()->previousSibling())   //count == 1
+        if (lastChild() && !lastChild()->previousSibling()) {   //count == 1
             // we need to force activation because setCurrentAnimation will have no effect
-            activateCurrentAnimation();
-        else {
-            setCurrentAnimation(lastChild(), true);
+            RETURN_IF_DELETED(activateCurrentAnimation());
+        } else {
+            RETURN_IF_DELETED(setCurrentAnimation(lastChild(), true));
         }
     }
 
     // and now we need to fast rewind from the current position to
     for (QAbstractAnimationJob *anim = m_currentAnimation; anim && anim != newAnimationIndex.animation; anim = anim->previousSibling()) {
-        setCurrentAnimation(anim, true);
+        RETURN_IF_DELETED(setCurrentAnimation(anim, true));
         RETURN_IF_DELETED(anim->setCurrentTime(0));
     }
     // setting the new current animation will happen later
@@ -220,7 +221,7 @@ void QSequentialAnimationGroupJob::updateCurrentTime(int currentTime)
             RETURN_IF_DELETED(rewindForwards(newAnimationIndex));
     }
 
-    setCurrentAnimation(newAnimationIndex.animation);
+    RETURN_IF_DELETED(setCurrentAnimation(newAnimationIndex.animation));
 
     const int newCurrentTime = currentTime - newAnimationIndex.timeOffset;
 
@@ -310,7 +311,7 @@ void QSequentialAnimationGroupJob::activateCurrentAnimation(bool intermediate)
     if (m_currentAnimation->totalDuration() == -1)
         resetUncontrolledAnimationFinishTime(m_currentAnimation);
 
-    m_currentAnimation->start();
+    RETURN_IF_DELETED(m_currentAnimation->start());
     if (!intermediate && isPaused())
         m_currentAnimation->pause();
 }

tests/auto/quick/qquickanimations/data/scriptActionCrash.qml

@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Jolla Ltd.
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+
+Item {
+    width: 400; height: 400
+
+    Component.onCompleted: rect.state = "wide"
+
+    Rectangle {
+        id: rect
+
+        color: "green"
+        width: 50
+        height: 50
+        anchors.centerIn: parent
+
+        states: State {
+            name: "wide"
+            PropertyChanges {
+                target: rect
+                width: 100
+            }
+        }
+        transitions: Transition {
+            to: "wide"
+            SequentialAnimation {
+                NumberAnimation { duration: 200; property: "width" }
+                ScriptAction { script: { rect.state = ""; rect.state = "wide" } }
+            }
+        }
+    }
+}

tests/auto/quick/qquickanimations/tst_qquickanimations.cpp

@@ -111,6 +111,7 @@ private slots:
     void pathAnimationInOutBackBug();
     void scriptActionBug();
     void groupAnimationNullChildBug();
+    void scriptActionCrash();
 };
 
 #define QTIMED_COMPARE(lhs, rhs) do { \
@@ -1478,6 +1479,20 @@ void tst_qquickanimations::groupAnimationNullChildBug()
     }
 }
 
+//ScriptAction should not crash if changing a state in a transition
+void tst_qquickanimations::scriptActionCrash()
+{
+    QQmlEngine engine;
+    QQmlComponent c(&engine, testFileUrl("scriptActionCrash.qml"));
+    QObject *obj = c.create();
+
+    //just testing that we don't crash
+    QTest::qWait(1000); //5x transition duration
+
+    delete obj;
+}
+
+
 
 QTEST_MAIN(tst_qquickanimations)