Improve particle system animation driver

- Do not automatically restart particle system animation when pressing the
  restart button if the animation is paused.
- Use own QElapsedTimer in AnimationDriver and properly handle animation
  driver pausing.

Change-Id: Ic2924fb66fddffb8878625be8fa766f06219ca61
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/animationdriver.cpp

@@ -31,8 +31,6 @@ AnimationDriver::AnimationDriver(QObject *parent)
 {
     setProperty("allowNegativeDelta", true);
     install();
-    connect(this, SIGNAL(started()), this, SLOT(startTimer()));
-    connect(this, SIGNAL(stopped()), this, SLOT(stopTimer()));
 }
 
 AnimationDriver::~AnimationDriver()
@@ -49,10 +47,13 @@ void AnimationDriver::timerEvent(QTimerEvent *e)
     // Provide same time for all users
     if (m_seekerEnabled) {
         m_seekerElapsed += (m_seekerPos * 100) / 30;
-        if (m_seekerElapsed + m_elapsed < -100) // -100 to allow small negative value
+        if (m_seekerElapsed + m_elapsed - m_pauseTime < -100) // -100 to allow small negative value
-            m_seekerElapsed = -m_elapsed - 100;
+            m_seekerElapsed = -(m_elapsed - m_pauseTime) - 100;
     } else {
-        m_elapsed = QAnimationDriver::elapsed();
+        if (!m_elapsedTimer.isValid())
+            m_elapsedTimer.restart();
+        else
+            m_elapsed = m_elapsedTimer.elapsed();
     }
     m_delta = elapsed() - old;
     advance();
@@ -75,7 +76,7 @@ void AnimationDriver::setSeekerPosition(int position)
         return;
 
     if (!m_timer.isActive())
-        restart();
+        startTimer();
 
     m_seekerPos = position;
 }

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/animationdriver.h

@@ -27,6 +27,7 @@
 
 #include <qabstractanimation.h>
 #include <QtCore/qbasictimer.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtCore/qmath.h>
 
 class AnimationDriver : public QAnimationDriver
@@ -46,17 +47,34 @@ public:
     }
     void reset()
     {
-        stop();
+        m_elapsedTimer.invalidate();
+        m_pauseBegin = 0;
+        m_pauseTime = 0;
+        m_elapsed = 0;
+        m_seekerElapsed = 0;
         stopTimer();
     }
     void restart()
     {
-        start();
+        m_pauseTime = 0;
+        m_elapsed = 0;
+        m_seekerElapsed = 0;
+        startTimer();
+    }
+    void pause()
+    {
+        m_pauseBegin = m_elapsedTimer.elapsed();
+        stopTimer();
+    }
+    void play()
+    {
+        if (m_elapsedTimer.isValid())
+            m_pauseTime += m_elapsedTimer.elapsed() - m_pauseBegin;
         startTimer();
     }
     qint64 elapsed() const override
     {
-        return m_elapsed + m_seekerElapsed;
+        return m_elapsed + m_seekerElapsed - m_pauseTime;
     }
     void setSeekerPosition(int position);
     void setSeekerEnabled(bool enable)
@@ -79,10 +97,13 @@ private:
     Q_SLOT void stopTimer();
 
     QBasicTimer m_timer;
+    QElapsedTimer m_elapsedTimer;
     int m_interval = 16;
     int m_seekerPos = 0;
     bool m_seekerEnabled = false;
     qint64 m_elapsed = 0;
     qint64 m_seekerElapsed = 0;
     qint64 m_delta = 0;
+    qint64 m_pauseTime = 0;
+    qint64 m_pauseBegin = 0;
 };

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5informationnodeinstanceserver.cpp

@@ -2078,21 +2078,21 @@ void Qt5InformationNodeInstanceServer::view3DAction(const View3DActionCommand &c
         m_particleAnimationPlaying = command.isEnabled();
         updatedState.insert("particlePlay", command.isEnabled());
         if (m_particleAnimationPlaying) {
-            m_particleAnimationDriver->reset();
+            m_particleAnimationDriver->play();
-            m_particleAnimationDriver->restart();
             m_particleAnimationDriver->setSeekerEnabled(false);
             m_particleAnimationDriver->setSeekerPosition(0);
         } else {
-            m_particleAnimationDriver->reset();
+            m_particleAnimationDriver->pause();
             m_particleAnimationDriver->setSeekerEnabled(true);
         }
         break;
     case View3DActionCommand::ParticlesRestart:
         resetParticleSystem();
-        m_particleAnimationPlaying = true;
+        if (m_particleAnimationPlaying) {
             m_particleAnimationDriver->restart();
             m_particleAnimationDriver->setSeekerEnabled(false);
             m_particleAnimationDriver->setSeekerPosition(0);
+        }
         break;
     case View3DActionCommand::ParticlesSeek:
         m_particleAnimationDriver->setSeekerPosition(static_cast<const View3DSeekActionCommand &>(command).position());

src/plugins/qmldesigner/components/edit3d/edit3dview.cpp

@@ -305,12 +305,6 @@ void Edit3DView::createEdit3DActions()
         resetPuppet();
     };
 
-    SelectionContextOperation particlesRestartTrigger = [this](const SelectionContext &) {
-        m_particlesPlayAction->action()->setChecked(true);
-        if (m_seeker)
-            m_seeker->setEnabled(false);
-    };
-
     SelectionContextOperation particlesPlayTrigger = [this](const SelectionContext &) {
         if (m_seeker)
             m_seeker->setEnabled(!m_particlesPlayAction->action()->isChecked());
@@ -334,7 +328,7 @@ void Edit3DView::createEdit3DActions()
                 QmlDesigner::Constants::EDIT3D_PARTICLES_RESTART, View3DActionCommand::ParticlesRestart,
                 QCoreApplication::translate("ParticlesRestartAction", "Restart Particles"),
                 QKeySequence(Qt::Key_E), false, false, Icons::EDIT3D_PARTICLE_RESTART.icon(),
-                Icons::EDIT3D_PARTICLE_RESTART.icon(), particlesRestartTrigger);
+                Icons::EDIT3D_PARTICLE_RESTART.icon());
     m_particlesPlayAction->action()->setEnabled(particlemode);
     m_particlesRestartAction->action()->setEnabled(particlemode);
     m_resetAction