void UPaperFlipbookComponent::TickFlipbook(float DeltaTime)
{
bool bIsFinished = false;
if (bPlaying)
{
const float TimelineLength = GetFlipbookLength();
const float EffectiveDeltaTime = DeltaTime * (bReversePlayback ? (-PlayRate) : (PlayRate));
float NewPosition = AccumulatedTime + EffectiveDeltaTime;
if (EffectiveDeltaTime > 0.0f)
{
if (NewPosition > TimelineLength)
{
if (bLooping)
{
// If looping, play to end, jump to start, and set target to somewhere near the beginning.
SetPlaybackPosition(TimelineLength, true);
SetPlaybackPosition(0.0f, false);
if (TimelineLength > 0.0f)
{
while (NewPosition > TimelineLength)
{
NewPosition -= TimelineLength;
}
}
else
{
NewPosition = 0.0f;
}
}
else
{
// If not looping, snap to end and stop playing.
NewPosition = TimelineLength;
Stop();
bIsFinished = true;
}
}
}
else
{
if (NewPosition < 0.0f)
{
if (bLooping)
{
// If looping, play to start, jump to end, and set target to somewhere near the end.
SetPlaybackPosition(0.0f, true);
SetPlaybackPosition(TimelineLength, false);
if (TimelineLength > 0.0f)
{
while (NewPosition < 0.0f)
{
NewPosition += TimelineLength;
}
}
else
{
NewPosition = 0.0f;
}
}
else
{
// If not looping, snap to start and stop playing.
NewPosition = 0.0f;
Stop();
bIsFinished = true;
}
}
}
SetPlaybackPosition(NewPosition, true);
}
// Notify user that the flipbook finished playing
if (bIsFinished)
{
OnFinishedPlaying.Broadcast();
}
}
void FTimeline::ReverseFromEnd()
{
SetPlaybackPosition(GetTimelineLength(), false);
Reverse();
}
void FTimeline::TickTimeline(float DeltaTime)
{
bool bIsFinished = false;
if(bPlaying)
{
float NewPosition = Position;
const float TimelineLength = GetTimelineLength();
if(!bReversePlayback)
{
NewPosition = Position + (DeltaTime * PlayRate);
if(NewPosition > TimelineLength)
{
// If looping, play to end, jump to start, and set target to somewhere near the beginning.
if(bLooping)
{
SetPlaybackPosition(TimelineLength, true);
SetPlaybackPosition(0.f, false);
if( TimelineLength > 0.f )
{
while(NewPosition > TimelineLength)
{
NewPosition -= TimelineLength;
}
}
else
{
NewPosition = 0.f;
}
}
// If not looping, snap to end and stop playing.
else
{
NewPosition = TimelineLength;
Stop();
bIsFinished = true;
}
}
}
else
{
NewPosition = Position - (DeltaTime * PlayRate);
if(NewPosition < 0.f)
{
// If looping, play to start, jump to end, and set target to somewhere near the end.
if(bLooping)
{
SetPlaybackPosition(0.f, true);
SetPlaybackPosition(TimelineLength, false);
if( TimelineLength > 0.f )
{
while(NewPosition < 0.f)
{
NewPosition += TimelineLength;
}
}
else
{
NewPosition = 0.f;
}
}
// If not looping, snap to start and stop playing.
else
{
NewPosition = 0.f;
Stop();
bIsFinished = true;
}
}
}
SetPlaybackPosition(NewPosition, true);
}
// Notify user that timeline finished
if (bIsFinished)
{
TimelineFinishedFunc.ExecuteIfBound();
TimelineFinishFuncStatic.ExecuteIfBound();
}
}
void FTimeline::SetNewTime(float NewTime)
{
// Ensure value is sensible
NewTime = FMath::Clamp<float>(NewTime, 0.0f, Length);
SetPlaybackPosition(NewTime, false);
}
void FTimeline::PlayFromStart()
{
SetPlaybackPosition(0.f, false);
Play();
}
