QParallelAnimationGroup: set the correct state for the animations

There were cases (now covered by autotests) where the state of the
animations could be wrong.

Reviewed-by: janarve
(cherry picked from commit 1f5afc4300d3d7e3063f4e2c80a280a5098717d1)

3 files changed, 194 insertions, 30 deletions

diff --git a/src/corelib/animation/qparallelanimationgroup.cpp b/src/corelib/animation/qparallelanimationgroup.cpp
index 5b7fd22..2812854 100644
--- a/src/corelib/animation/qparallelanimationgroup.cpp
+++ b/src/corelib/animation/qparallelanimationgroup.cpp
@@ -143,13 +143,14 @@ void QParallelAnimationGroup::updateCurrentTime(int currentTime)
         // simulate completion of the loop seeking backwards
         for (int i = 0; i < d->animations.size(); ++i) {
             QAbstractAnimation *animation = d->animations.at(i);
+            //we need to make sure the animation is in the right state
+            //and then rewind it
+            d->applyGroupState(animation);
             animation->setCurrentTime(0);
             animation->stop();
         }
     }
 
-    bool timeFwd = ((d->currentLoop == d->lastLoop && currentTime >= d->lastCurrentTime)
-                   || d->currentLoop > d->lastLoop);
 #ifdef QANIMATION_DEBUG
     qDebug("QParallellAnimationGroup %5d: setCurrentTime(%d), loop:%d, last:%d, timeFwd:%d, lastcurrent:%d, %d",
         __LINE__, d->currentTime, d->currentLoop, d->lastLoop, timeFwd, d->lastCurrentTime, state());
@@ -158,34 +159,19 @@ void QParallelAnimationGroup::updateCurrentTime(int currentTime)
     for (int i = 0; i < d->animations.size(); ++i) {
         QAbstractAnimation *animation = d->animations.at(i);
         const int dura = animation->totalDuration();
-        if (dura == -1 && d->isUncontrolledAnimationFinished(animation))
-            continue;
-        if (dura == -1 || (currentTime <= dura && dura != 0)
-            || (dura == 0 && d->currentLoop != d->lastLoop)) {
-            switch (state()) {
-            case Running:
-                animation->start();
-                break;
-            case Paused:
-                animation->pause();
-                break;
-            case Stopped:
-            default:
-                break;
-            }
+        //if the loopcount is bigger we should always start all animations
+        if (d->currentLoop > d->lastLoop 
+            //if we're at the end of the animation, we need to start it if it wasn't already started in this loop
+            //this happens in Backward direction where not all animations are started at the same time
+            || d->shouldAnimationStart(animation, d->lastCurrentTime > dura /*startIfAtEnd*/)) {
+            d->applyGroupState(animation);
         }
 
-        if (dura <= 0) {
-            if (dura == -1)
-                animation->setCurrentTime(currentTime);
-            continue;
+        if (animation->state() == state()) {
+            animation->setCurrentTime(currentTime);
+            if (dura > 0 && currentTime > dura)
+                animation->stop();
         }
-
-        if ((timeFwd && d->lastCurrentTime <= dura)
-            || (!timeFwd && d->currentTime <= dura))
-                animation->setCurrentTime(currentTime);
-        if (currentTime > dura)
-            animation->stop();
     }
     d->lastLoop = d->currentLoop;
     d->lastCurrentTime = currentTime;
@@ -208,7 +194,8 @@ void QParallelAnimationGroup::updateState(QAbstractAnimation::State oldState,
         break;
     case Paused:
         for (int i = 0; i < d->animations.size(); ++i)
-            d->animations.at(i)->pause();
+            if (d->animations.at(i)->state() == Running)
+                d->animations.at(i)->pause();
         break;
     case Running:
         d->connectUncontrolledAnimations();
@@ -217,7 +204,8 @@ void QParallelAnimationGroup::updateState(QAbstractAnimation::State oldState,
             if (oldState == Stopped)
                 animation->stop();
             animation->setDirection(d->direction);
-            animation->start();
+            if (d->shouldAnimationStart(animation, oldState == Stopped))
+                animation->start();
         }
         break;
     }
@@ -280,6 +268,36 @@ void QParallelAnimationGroupPrivate::connectUncontrolledAnimations()
     }
 }
 
+bool QParallelAnimationGroupPrivate::shouldAnimationStart(QAbstractAnimation *animation, bool startIfAtEnd) const
+{
+    const int dura = animation->totalDuration();
+    if (dura == -1)
+        return !isUncontrolledAnimationFinished(animation);
+    if (startIfAtEnd)
+        return currentTime <= dura;
+    if (direction == QAbstractAnimation::Forward)
+        return currentTime < dura;
+    else //direction == QAbstractAnimation::Backward
+        return currentTime && currentTime <= dura;
+}
+
+void QParallelAnimationGroupPrivate::applyGroupState(QAbstractAnimation *animation)
+{
+    switch (state) 
+    {
+    case QAbstractAnimation::Running:
+        animation->start();
+        break;
+    case QAbstractAnimation::Paused:
+        animation->pause();
+        break;
+    case QAbstractAnimation::Stopped:
+    default:
+        break;
+    }
+}
+
+
 bool QParallelAnimationGroupPrivate::isUncontrolledAnimationFinished(QAbstractAnimation *anim) const
 {
     return uncontrolledFinishTime.value(anim, -1) >= 0;
diff --git a/src/corelib/animation/qparallelanimationgroup_p.h b/src/corelib/animation/qparallelanimationgroup_p.h
index 8e1fb34..fa0ef95 100644
--- a/src/corelib/animation/qparallelanimationgroup_p.h
+++ b/src/corelib/animation/qparallelanimationgroup_p.h
@@ -74,6 +74,8 @@ public:
     int lastLoop;
     int lastCurrentTime;
 
+    bool shouldAnimationStart(QAbstractAnimation *animation, bool startIfAtEnd) const;
+    void applyGroupState(QAbstractAnimation *animation);
     bool isUncontrolledAnimationFinished(QAbstractAnimation *anim) const;
     void connectUncontrolledAnimations();
     void disconnectUncontrolledAnimations();
diff --git a/tests/auto/qparallelanimationgroup/tst_qparallelanimationgroup.cpp b/tests/auto/qparallelanimationgroup/tst_qparallelanimationgroup.cpp
index acd23b0..8578d36 100644
--- a/tests/auto/qparallelanimationgroup/tst_qparallelanimationgroup.cpp
+++ b/tests/auto/qparallelanimationgroup/tst_qparallelanimationgroup.cpp
@@ -62,6 +62,7 @@ public Q_SLOTS:
 private slots:
     void construction();
     void setCurrentTime();
+    void stateChanged();
     void clearGroup();
     void propagateGroupUpdateToChildren();
     void updateChildrenWithRunningGroup();
@@ -252,6 +253,112 @@ void tst_QParallelAnimationGroup::setCurrentTime()
     QCOMPARE(loopsForever->currentTime(), 1);
 }
 
+void tst_QParallelAnimationGroup::stateChanged()
+{
+    //this ensures that the correct animations are started when starting the group
+    TestAnimation *anim1 = new TestAnimation;
+    TestAnimation *anim2 = new TestAnimation;
+    TestAnimation *anim3 = new TestAnimation;
+    TestAnimation *anim4 = new TestAnimation;
+    anim1->setDuration(1000);
+    anim2->setDuration(2000);
+    anim3->setDuration(3000);
+    anim4->setDuration(3000);
+    QParallelAnimationGroup group;
+    group.addAnimation(anim1);
+    group.addAnimation(anim2);
+    group.addAnimation(anim3);
+    group.addAnimation(anim4);
+
+    QSignalSpy spy1(anim1, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
+    QSignalSpy spy2(anim2, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
+    QSignalSpy spy3(anim3, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
+    QSignalSpy spy4(anim4, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
+
+    //first; let's start forward
+    group.start();
+    //all the animations should be started
+    QCOMPARE(spy1.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy1.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy2.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy2.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy3.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy3.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy4.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy4.last().at(1)), TestAnimation::Running);
+
+    group.setCurrentTime(1500); //anim1 should be finished
+    QCOMPARE(group.state(), QAnimationGroup::Running);
+    QCOMPARE(spy1.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy1.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy2.count(), 1); //no change
+    QCOMPARE(spy3.count(), 1); //no change
+    QCOMPARE(spy4.count(), 1); //no change
+
+    group.setCurrentTime(2500); //anim2 should be finished
+    QCOMPARE(group.state(), QAnimationGroup::Running);
+    QCOMPARE(spy1.count(), 2); //no change
+    QCOMPARE(spy2.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy2.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy3.count(), 1); //no change
+    QCOMPARE(spy4.count(), 1); //no change
+
+    group.setCurrentTime(3500); //everything should be finished
+    QCOMPARE(group.state(), QAnimationGroup::Stopped);
+    QCOMPARE(spy1.count(), 2); //no change
+    QCOMPARE(spy2.count(), 2); //no change
+    QCOMPARE(spy3.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy3.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy4.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy4.last().at(1)), TestAnimation::Stopped);
+
+    //cleanup
+    spy1.clear();
+    spy2.clear();
+    spy3.clear();
+    spy4.clear();
+
+    //now let's try to reverse that
+    group.setDirection(QAbstractAnimation::Backward);
+    group.start();
+
+    //only anim3 and anim4 should be started
+    QCOMPARE(group.state(), QAnimationGroup::Running);
+    QCOMPARE(spy1.count(), 0);
+    QCOMPARE(spy2.count(), 0);
+    QCOMPARE(spy3.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy3.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy4.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy4.last().at(1)), TestAnimation::Running);
+
+    group.setCurrentTime(1500); //anim2 should be started
+    QCOMPARE(group.state(), QAnimationGroup::Running);
+    QCOMPARE(spy1.count(), 0); //no change
+    QCOMPARE(spy2.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy2.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy3.count(), 1); //no change
+    QCOMPARE(spy4.count(), 1); //no change
+
+    group.setCurrentTime(500); //anim1 is finally also started
+    QCOMPARE(group.state(), QAnimationGroup::Running);
+    QCOMPARE(spy1.count(), 1);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy1.last().at(1)), TestAnimation::Running);
+    QCOMPARE(spy2.count(), 1); //no change
+    QCOMPARE(spy3.count(), 1); //no change
+    QCOMPARE(spy4.count(), 1); //no change
+
+    group.setCurrentTime(0); //everything should be stopped
+    QCOMPARE(group.state(), QAnimationGroup::Stopped);
+    QCOMPARE(spy1.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy1.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy2.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy2.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy3.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy3.last().at(1)), TestAnimation::Stopped);
+    QCOMPARE(spy4.count(), 2);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy4.last().at(1)), TestAnimation::Stopped);
+}
+
 void tst_QParallelAnimationGroup::clearGroup()
 {
     QParallelAnimationGroup group;
@@ -398,7 +505,7 @@ void tst_QParallelAnimationGroup::deleteChildrenWithRunningGroup()
     QCOMPARE(group.state(), QAnimationGroup::Running);
     QCOMPARE(anim1->state(), QAnimationGroup::Running);
 
-    QTest::qWait(50);
+    QTest::qWait(80);
     QVERIFY(group.currentTime() > 0);
 
     delete anim1;
@@ -564,14 +671,23 @@ void tst_QParallelAnimationGroup::zeroDurationAnimation()
     anim2.setEndValue(100);
     anim2.setDuration(100);
 
+    TestAnimation anim3;
+    anim3.setStartValue(0);
+    anim3.setEndValue(100);
+    anim3.setDuration(10);
+
     QSignalSpy stateChangedSpy1(&anim1, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
     QSignalSpy finishedSpy1(&anim1, SIGNAL(finished()));
 
     QSignalSpy stateChangedSpy2(&anim2, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
     QSignalSpy finishedSpy2(&anim2, SIGNAL(finished()));
 
+    QSignalSpy stateChangedSpy3(&anim3, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)));
+    QSignalSpy finishedSpy3(&anim3, SIGNAL(finished()));
+
     group.addAnimation(&anim1);
     group.addAnimation(&anim2);
+    group.addAnimation(&anim3);
     QCOMPARE(stateChangedSpy1.count(), 0);
     group.start();
     QCOMPARE(stateChangedSpy1.count(), 2);
@@ -586,9 +702,15 @@ void tst_QParallelAnimationGroup::zeroDurationAnimation()
     QCOMPARE(qVariantValue<QAbstractAnimation::State>(stateChangedSpy1.at(0).at(1)),
              QAnimationGroup::Running);
 
+    QCOMPARE(stateChangedSpy3.count(), 1);
+    QCOMPARE(finishedSpy3.count(), 0);
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(stateChangedSpy3.at(0).at(1)),
+             QAnimationGroup::Running);
+
 
     QCOMPARE(anim1.state(), QAnimationGroup::Stopped);
     QCOMPARE(anim2.state(), QAnimationGroup::Running);
+    QCOMPARE(anim3.state(), QAnimationGroup::Running);
     QCOMPARE(group.state(), QAnimationGroup::Running);
 
 
@@ -596,19 +718,24 @@ void tst_QParallelAnimationGroup::zeroDurationAnimation()
     group.setLoopCount(4);
     stateChangedSpy1.clear();
     stateChangedSpy2.clear();
+    stateChangedSpy3.clear();
 
     group.start();
     QCOMPARE(stateChangedSpy1.count(), 2);
     QCOMPARE(stateChangedSpy2.count(), 1);
+    QCOMPARE(stateChangedSpy3.count(), 1);
     group.setCurrentTime(50);
     QCOMPARE(stateChangedSpy1.count(), 2);
     QCOMPARE(stateChangedSpy2.count(), 1);
+    QCOMPARE(stateChangedSpy3.count(), 2);
     group.setCurrentTime(150);
     QCOMPARE(stateChangedSpy1.count(), 4);
     QCOMPARE(stateChangedSpy2.count(), 3);
+    QCOMPARE(stateChangedSpy3.count(), 4);
     group.setCurrentTime(50);
     QCOMPARE(stateChangedSpy1.count(), 6);
     QCOMPARE(stateChangedSpy2.count(), 5);
+    QCOMPARE(stateChangedSpy3.count(), 6);
 
 }
 
@@ -863,6 +990,23 @@ void tst_QParallelAnimationGroup::pauseResume()
     QCOMPARE(anim->state(), QAnimationGroup::Running);
     QCOMPARE(anim->currentTime(), currentTime);
     QCOMPARE(spy.count(), 1);
+
+    group.stop();
+    spy.clear();
+    new TestAnimation2(500, &group);
+    group.start();
+    QCOMPARE(spy.count(), 1); //the animation should have been started
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy.last().at(1)), TestAnimation::Running);
+    group.setCurrentTime(250); //end of first animation
+    QCOMPARE(spy.count(), 2); //the animation should have been stopped
+    QCOMPARE(qVariantValue<QAbstractAnimation::State>(spy.last().at(1)), TestAnimation::Stopped);
+    group.pause();
+    QCOMPARE(spy.count(), 2); //this shouldn't have changed
+    group.resume();
+    QCOMPARE(spy.count(), 2); //this shouldn't have changed
+
+
+
 }