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c042ddcb94
Introduces the concept of "Active Ticking" to allow Slate to go to sleep when there is no need to update the UI.
While asleep, Slate will skip the Tick & Paint pass for that frame entirely.
- There are TWO ways to "wake" Slate and cause a Tick/Paint pass:
1. Provide some sort of input (mouse movement, clicks, and key presses). Slate will always tick when the user is active.
- Therefore, if the logic in a given widget's Tick is only relevant in response to user action, there is no need to register an active tick.
2. Register an Active Tick. Currently this is an all-or-nothing situation, so if a single active tick needs to execute, all of Slate will be ticked.
- The purpose of an Active Tick is to allow a widget to "drive" Slate and guarantee a Tick/Paint pass in the absence of any user action.
- Examples include animation, async operations that update periodically, progress updates, loading bars, etc.
- An empty active tick is registered for viewports when they are real-time, so game project widgets are unaffected by this change and should continue to work as before.
- An Active Tick is registered by creating an FWidgetActiveTickDelegate and passing it to SWidget::RegisterActiveTick()
- There are THREE ways to unregister an active tick:
1. Return EActiveTickReturnType::StopTicking from the active tick function
2. Pass the FActiveTickHandle returned by RegisterActiveTick() to SWidget::UnregisterActiveTick()
3. Destroy the widget responsible for the active tick
- Sleeping is currently disabled, can be enabled with Slate.AllowSlateToSleep cvar
- There is currently a little buffer time during which Slate continues to tick following any input. Long-term, this is planned to be removed.
- The duration of the buffer can be adjusted using Slate.SleepBufferPostInput cvar (defaults to 1.0f)
- The FCurveSequence API has been updated to work with the active tick system
- Playing a curve sequence now requires that you pass the widget being animated by the sequence
- The active tick will automatically be registered on behalf of the widget and unregister when the sequence is complete
- GetLerpLooping() has been removed. Instead, pass true as the second param to Play() to indicate that the animation will loop. This causes the active tick to be registered indefinitely until paused or jumped to the start/end.
[CL 2391669 by Dan Hertzka in Main branch]
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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#pragma once
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/**
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* Tools for animation tracks
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*/
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class FAnimationTrackEditor : public FMovieSceneTrackEditor
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{
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public:
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/**
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* Constructor
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*
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* @param InSequencer The sequencer instance to be used by this tool
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*/
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FAnimationTrackEditor( TSharedRef<ISequencer> InSequencer );
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~FAnimationTrackEditor();
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/**
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* Creates an instance of this class. Called by a sequencer
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*
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* @param OwningSequencer The sequencer instance to be used by this tool
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* @return The new instance of this class
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*/
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static TSharedRef<FMovieSceneTrackEditor> CreateTrackEditor( TSharedRef<ISequencer> OwningSequencer );
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/** FMovieSceneTrackEditor Interface */
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virtual bool SupportsType( TSubclassOf<UMovieSceneTrack> Type ) const override;
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virtual TSharedRef<ISequencerSection> MakeSectionInterface( UMovieSceneSection& SectionObject, UMovieSceneTrack* Track ) override;
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virtual void AddKey(const FGuid& ObjectGuid, UObject* AdditionalAsset) override;
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virtual bool HandleAssetAdded(UObject* Asset, const FGuid& TargetObjectGuid) override;
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virtual void BuildObjectBindingContextMenu(FMenuBuilder& MenuBuilder, const FGuid& ObjectBinding, const UClass* ObjectClass) override;
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private:
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/** Delegate for AnimatablePropertyChanged in AddKey */
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void AddKeyInternal(float KeyTime, const TArray<UObject*> Objects, class UAnimSequence* AnimSequence);
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/** Gets a skeleton from an object guid in the movie scene */
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class USkeleton* AcquireSkeletonFromObjectGuid(const FGuid& Guid);
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};
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/** Class for animation sections, handles drawing of all waveform previews */
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class FAnimationSection : public ISequencerSection, public TSharedFromThis<FAnimationSection>
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{
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public:
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FAnimationSection( UMovieSceneSection& InSection );
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~FAnimationSection();
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/** ISequencerSection interface */
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virtual UMovieSceneSection* GetSectionObject() override;
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virtual FText GetDisplayName() const override;
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virtual FText GetSectionTitle() const override;
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virtual float GetSectionHeight() const override;
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virtual void GenerateSectionLayout( class ISectionLayoutBuilder& LayoutBuilder ) const override {}
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virtual int32 OnPaintSection( const FGeometry& AllottedGeometry, const FSlateRect& SectionClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, bool bParentEnabled ) const override;
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private:
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/** The section we are visualizing */
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UMovieSceneSection& Section;
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};
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