/// <summary>
/// Moves the clock forward to the current time and updates the state of
/// all timing objects based on the time change.
/// </summary>
/// <remarks>
/// The associated reference clock is used to determine the current time.
/// The new position of the clock will be equal to the difference between the
/// starting system time and the current system time. The time manager requires
/// the system time to move forward.
/// </remarks>
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking
public void Tick()
{
try
{
#if DEBUG
// On a regular interval, clean up our tables of known
// timelines and clocks
if (++_frameCount >= 1000) // Should be about once every 10s
{
Timeline.CleanKnownTimelinesTable();
System.Windows.Media.Animation.Clock.CleanKnownClocksTable();
_frameCount = 0;
}
#endif // DEBUG
// Don't need to worry about needing a tick sooner
_nextTickTimeQueried = false;
// Mark the tree as clean immediately. If any changes occur during
// processing of the tick, the tree will be marked as dirty again.
_isDirty = false;
// No effect unless we are in the running state
if (_timeState == TimeState.Running)
{
// Figure out the current time
_globalTime = GetCurrentGlobalTime();
// Start the tick
_isInTick = true;
}
// Trace the start of the tick and pass along the absolute time to which
// we are ticking.
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordAnimation | EventTrace.Keyword.KeywordPerf, EventTrace.Event.WClientTimeManagerTickBegin, (_startTime + _globalTime).Ticks / TimeSpan.TicksPerMillisecond);
// Run new property querying logic on the timing tree
if (_lastTimeState == TimeState.Stopped && _timeState == TimeState.Stopped) // We were stopped the whole time
{
_currentTickInterval = TimeIntervalCollection.CreateNullPoint();
}
else // We were not stopped at some time, so process the tick interval
{
_currentTickInterval = TimeIntervalCollection.CreateOpenClosedInterval(_lastTickTime, _globalTime);
// If at either tick we were stopped, add the null point to represent that
if (_lastTimeState == TimeState.Stopped || _timeState == TimeState.Stopped)
{
_currentTickInterval.AddNullPoint();
}
}
// Compute the tree state, using _currentTickInterval to compute the events that occured
_timeManagerClock.ComputeTreeState();
// Cache TimeManager state at this time
_lastTimeState = _timeState;
// When the tick is done, we raise timing events
RaiseEnqueuedEvents();
}
finally
{
_isInTick = false;
// Cache the tick time
_lastTickTime = _globalTime;
//trace the end of the tick
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordAnimation | EventTrace.Keyword.KeywordPerf, EventTrace.Event.WClientTimeManagerTickEnd);
}
// At the end of every tick clean up GC'ed clocks, if necessary
CleanupClocks();
}
