Particles: Invalidate all group IDs when groups are reset.

Task-number: QTBUG-52325
Change-Id: I38d90b6fb0d7468fb0916bd6dfd1cf07ace4389b
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

2 files changed, 9 insertions, 3 deletions

diff --git a/src/particles/qquickparticleemitter_p.h b/src/particles/qquickparticleemitter_p.h
index 9b114ad46b..dd55fdc7a6 100644
--- a/src/particles/qquickparticleemitter_p.h
+++ b/src/particles/qquickparticleemitter_p.h
@@ -322,6 +322,8 @@ public:
            return m_startTime;
        }
 
+       void reclaculateGroupId() const;
+
 protected:
        qreal m_particlesPerSecond;
        int m_particleDuration;
@@ -359,9 +361,6 @@ protected:
 
        bool isEmitConnected();
 
-private: // methods
-       void reclaculateGroupId() const;
-
 private: // data
        QString m_group;
        mutable bool m_groupIdNeedRecalculation;
diff --git a/src/particles/qquickparticlesystem.cpp b/src/particles/qquickparticlesystem.cpp
index 17d9e49d63..b60180b2ed 100644
--- a/src/particles/qquickparticlesystem.cpp
+++ b/src/particles/qquickparticlesystem.cpp
@@ -597,6 +597,13 @@ void QQuickParticleSystem::initGroups()
     groupIds.clear();
     nextFreeGroupId = 0;
 
+    for (auto e : qAsConst(m_emitters)) {
+        e->reclaculateGroupId();
+    }
+    foreach (QQuickParticlePainter *p, m_painters) {
+        p->recalculateGroupIds();
+    }
+
     QQuickParticleGroupData *pd = new QQuickParticleGroupData(QString(), this); // Default group
     Q_ASSERT(pd->index == 0);
     Q_UNUSED(pd);