C++ UMovieSceneSection::SetEndTime方法代码示例

UMovieSceneSection* UMovieSceneSection::SplitSection(float SplitTime)
{
	if (!IsTimeWithinSection(SplitTime))
	{
		return nullptr;
	}

	SetFlags(RF_Transactional);

	if (TryModify())
	{
		float SectionEndTime = GetEndTime();
				
		// Trim off the right
		SetEndTime(SplitTime);

		// Create a new section
		UMovieSceneTrack* Track = CastChecked<UMovieSceneTrack>(GetOuter());
		Track->Modify();

		UMovieSceneSection* NewSection = DuplicateObject<UMovieSceneSection>(this, Track);
		check(NewSection);

		NewSection->SetStartTime(SplitTime);
		NewSection->SetEndTime(SectionEndTime);
		Track->AddSection(*NewSection);

		return NewSection;
	}

	return nullptr;
}

void FNameCurveKeyArea::PasteKeys(const FMovieSceneClipboardKeyTrack& KeyTrack, const FMovieSceneClipboardEnvironment& SrcEnvironment, const FSequencerPasteEnvironment& DstEnvironment)
{
	float PasteAt = DstEnvironment.CardinalTime;

	KeyTrack.IterateKeys([&](const FMovieSceneClipboardKey& Key){
		UMovieSceneSection* Section = GetOwningSection();
		if (!Section)
		{
			return true;
		}

		if (Section->TryModify())
		{		
			float Time = PasteAt + Key.GetTime();
			if (Section->GetStartTime() > Time)
			{
				Section->SetStartTime(Time);
			}
			if (Section->GetEndTime() < Time)
			{
				Section->SetEndTime(Time);
			}

			FKeyHandle KeyHandle = Curve.UpdateOrAddKey(Time, Key.GetValue<FName>());
			DstEnvironment.ReportPastedKey(KeyHandle, *this);
		}
			
		return true;
	});
}

UMovieSceneSection* UMovieScenePropertyTrack::FindOrAddSection( float Time )
{
	// Find a spot for the section so that they are sorted by start time
	for( int32 SectionIndex = 0; SectionIndex < Sections.Num(); ++SectionIndex )
	{
		UMovieSceneSection* Section = Sections[SectionIndex];

		if( Section->IsTimeWithinSection( Time ) )
		{
			return Section;
		}

		// Check if there are no more sections that would overlap the time 
		if( !Sections.IsValidIndex( SectionIndex+1 ) || Sections[SectionIndex+1]->GetStartTime() > Time )
		{
			// No sections overlap the time
		
			if( SectionIndex > 0 )
			{
				// Append and grow the previous section
				UMovieSceneSection* PreviousSection = Sections[ SectionIndex ? SectionIndex-1 : 0 ];
		
				PreviousSection->SetEndTime( Time );
				return PreviousSection;
			}
			else if( Sections.IsValidIndex( SectionIndex+1 ) )
			{
				// Prepend and grow the next section because there are no sections before this one
				UMovieSceneSection* NextSection = Sections[SectionIndex+1];
				NextSection->SetStartTime( Time );
				return NextSection;
			}	
			else
			{
				// SectionIndex == 0 
				UMovieSceneSection* PreviousSection = Sections[0];
				if( PreviousSection->GetEndTime() < Time )
				{
					// Append and grow the section
					PreviousSection->SetEndTime( Time );
				}
				else
				{
					// Prepend and grow the section
					PreviousSection->SetStartTime( Time );
				}
				return PreviousSection;
			}
		}

	}

	check( Sections.Num() == 0 );

	// Add a new section that starts and ends at the same time
	UMovieSceneSection* NewSection = CreateNewSection();
	NewSection->SetStartTime( Time );
	NewSection->SetEndTime( Time );

	Sections.Add( NewSection );

	return NewSection;
}

void FMoveKeys::OnDrag( const FPointerEvent& MouseEvent, const FVector2D& LocalMousePos, const FTimeToPixel& TimeToPixelConverter, TSharedPtr<FTrackNode> SequencerNode )
{
	// Convert the delta position to a delta time amount that was moved
	float MouseTime = TimeToPixelConverter.PixelToTime(LocalMousePos.X);
	float SelectedKeyTime = DraggedKey.KeyArea->GetKeyTime(DraggedKey.KeyHandle.GetValue());
	float DistanceMoved = MouseTime - SelectedKeyTime;

	if( DistanceMoved != 0.0f )
	{
		float TimeDelta = DistanceMoved;
		// Snapping
		if ( Settings->GetIsSnapEnabled() )
		{
			bool bSnappedToKeyTime = false;
			if ( Settings->GetSnapKeyTimesToKeys() )
			{
				TArray<float> OutSnapTimes;
				GetKeySnapTimes(OutSnapTimes, SequencerNode);

				TArray<float> InitialTimes;
				for ( FSelectedKey SelectedKey : SelectedKeys )
				{
					InitialTimes.Add(SelectedKey.KeyArea->GetKeyTime(SelectedKey.KeyHandle.GetValue()) + DistanceMoved);
				}
				float OutInitialTime = 0.f;
				float OutSnapTime = 0.f;
				if ( SnapToTimes( InitialTimes, OutSnapTimes, TimeToPixelConverter, OutInitialTime, OutSnapTime ) )
				{
					bSnappedToKeyTime = true;
					TimeDelta = OutSnapTime - (OutInitialTime - DistanceMoved);
				}
			}

			if ( bSnappedToKeyTime == false && Settings->GetSnapKeyTimesToInterval() )
			{
				TimeDelta = Settings->SnapTimeToInterval( MouseTime ) - SelectedKeyTime;
			}
		}

		for( FSelectedKey SelectedKey : SelectedKeys )
		{
			UMovieSceneSection* Section = SelectedKey.Section;

			TSharedPtr<IKeyArea>& KeyArea = SelectedKey.KeyArea;


			// Tell the key area to move the key.  We reset the key index as a result of the move because moving a key can change it's internal index 
			KeyArea->MoveKey( SelectedKey.KeyHandle.GetValue(), TimeDelta );

			// Update the key that moved
			float NewKeyTime = KeyArea->GetKeyTime( SelectedKey.KeyHandle.GetValue() );

			// If the key moves outside of the section resize the section to fit the key
			// @todo Sequencer - Doesn't account for hitting other sections 
			if( NewKeyTime > Section->GetEndTime() )
			{
				Section->SetEndTime( NewKeyTime );
			}
			else if( NewKeyTime < Section->GetStartTime() )
			{
				Section->SetStartTime( NewKeyTime );
			}
		}
	}
}