Initial import from qtquick2.

Branched from the monolithic repo, Qt qtquick2 branch, at commit
a4a585d2ee907746682846ae6e8a48e19deef469

3 files changed, 59 insertions, 5 deletions

diff --git a/src/corelib/animation/qabstractanimation.cpp b/src/corelib/animation/qabstractanimation.cpp
index 602cf8a6fd..f399d7c4cf 100644
--- a/src/corelib/animation/qabstractanimation.cpp
+++ b/src/corelib/animation/qabstractanimation.cpp
@@ -260,7 +260,8 @@ void QUnifiedTimer::restartAnimationTimer()
     } else if (!driver->isRunning() || isPauseTimerActive) {
         driver->start();
         isPauseTimerActive = false;
-    }
+    } else if (runningLeafAnimations == 0)
+        driver->stop();
 }
 
 void QUnifiedTimer::setTimingInterval(int interval)
@@ -389,20 +390,50 @@ int QUnifiedTimer::closestPauseAnimationTimeToFinish()
     return closestTimeToFinish;
 }
 
+
 void QUnifiedTimer::installAnimationDriver(QAnimationDriver *d)
 {
-    if (driver->isRunning()) {
-        qWarning("QUnifiedTimer: Cannot change animation driver while animations are running");
+    if (driver != &defaultDriver) {
+        qWarning("QUnifiedTimer: animation driver already installed...");
         return;
     }
 
-    if (driver && driver != &defaultDriver)
-        delete driver;
+    if (driver->isRunning()) {
+        driver->stop();
+        d->start();
+    }
 
     driver = d;
+
+}
+
+
+void QUnifiedTimer::uninstallAnimationDriver(QAnimationDriver *d)
+{
+    if (driver != d) {
+        qWarning("QUnifiedTimer: trying to uninstall a driver that is not installed...");
+        return;
+    }
+
+    driver = &defaultDriver;
+
+    if (d->isRunning()) {
+        d->stop();
+        driver->start();
+    }
 }
 
 /*!
+    Returns true if \a d is the currently installed animation driver
+    and is not the default animation driver (which can never be uninstalled).
+*/
+bool QUnifiedTimer::canUninstallAnimationDriver(QAnimationDriver *d)
+{
+    return d == driver && driver != &defaultDriver;
+}
+
+
+/*!
    \class QAnimationDriver
 
    \brief The QAnimationDriver class is used to exchange the mechanism that drives animations.
@@ -424,6 +455,12 @@ QAnimationDriver::QAnimationDriver(QAnimationDriverPrivate &dd, QObject *parent)
 {
 }
 
+QAnimationDriver::~QAnimationDriver()
+{
+    QUnifiedTimer *timer = QUnifiedTimer::instance(true);
+    if (timer->canUninstallAnimationDriver(this))
+        uninstall();
+}
 
 /*!
     Advances the animation based on the current time. This function should
@@ -453,6 +490,15 @@ void QAnimationDriver::install()
     timer->installAnimationDriver(this);
 }
 
+/*!
+    Uninstalls this animation driver.
+ */
+void QAnimationDriver::uninstall()
+{
+    QUnifiedTimer *timer = QUnifiedTimer::instance(true);
+    timer->uninstallAnimationDriver(this);
+}
+
 bool QAnimationDriver::isRunning() const
 {
     return d_func()->running;
diff --git a/src/corelib/animation/qabstractanimation.h b/src/corelib/animation/qabstractanimation.h
index 0900870ce2..a0cb0f93d0 100644
--- a/src/corelib/animation/qabstractanimation.h
+++ b/src/corelib/animation/qabstractanimation.h
@@ -141,9 +141,12 @@ class Q_CORE_EXPORT QAnimationDriver : public QObject
 
 public:
     QAnimationDriver(QObject *parent = 0);
+    ~QAnimationDriver();
 
     void advance();
+
     void install();
+    void uninstall();
 
     bool isRunning() const;
 
diff --git a/src/corelib/animation/qabstractanimation_p.h b/src/corelib/animation/qabstractanimation_p.h
index ba92960f6b..1cba4644a8 100644
--- a/src/corelib/animation/qabstractanimation_p.h
+++ b/src/corelib/animation/qabstractanimation_p.h
@@ -180,10 +180,15 @@ public:
     static void updateAnimationTimer();
 
     void installAnimationDriver(QAnimationDriver *driver);
+    void uninstallAnimationDriver(QAnimationDriver *driver);
+    bool canUninstallAnimationDriver(QAnimationDriver *driver);
 
     void restartAnimationTimer();
     void updateAnimationsTime();
 
+    //useful for profiling/debugging
+    int runningAnimationCount() { return animations.count(); }
+
 protected:
     void timerEvent(QTimerEvent *);