// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

#pragma once


/**
 * Tools for audio tracks
 */
class FAudioTrackEditor : public FMovieSceneTrackEditor
{
public:
	/**
	 * Constructor
	 *
	 * @param InSequencer	The sequencer instance to be used by this tool
	 */
	FAudioTrackEditor( TSharedRef<ISequencer> InSequencer );
	~FAudioTrackEditor();

	/**
	 * Creates an instance of this class.  Called by a sequencer 
	 *
	 * @param OwningSequencer The sequencer instance to be used by this tool
	 * @return The new instance of this class
	 */
	static TSharedRef<FMovieSceneTrackEditor> CreateTrackEditor( TSharedRef<ISequencer> OwningSequencer );

	/** FMovieSceneTrackEditor Interface */
	virtual bool SupportsType( TSubclassOf<UMovieSceneTrack> Type ) const override;
	virtual TSharedRef<ISequencerSection> MakeSectionInterface( UMovieSceneSection& SectionObject, UMovieSceneTrack* Track ) override;
	virtual bool HandleAssetAdded(UObject* Asset, const FGuid& TargetObjectGuid) override;
	
private:
	/** Delegate for AnimatablePropertyChanged in HandleAssetAdded for master sounds */
	void AddNewMasterSound( float KeyTime, class USoundBase* Sound );
	/** Delegate for AnimatablePropertyChanged in HandleAssetAdded for attached sounds */
	void AddNewAttachedSound( float KeyTime, class USoundBase* Sound, TArray<UObject*> ObjectsToAttachTo );
};



/** Class for audio sections, handles drawing of all waveform previews */
class FAudioSection : public ISequencerSection, public TSharedFromThis<FAudioSection>
{
public:
	FAudioSection( UMovieSceneSection& InSection, bool bOnAMasterTrack );
	~FAudioSection();

	/** ISequencerSection interface */
	virtual UMovieSceneSection* GetSectionObject() override;
	virtual FText GetDisplayName() const override;
	virtual FText GetSectionTitle() const override;
	virtual float GetSectionHeight() const override;
	virtual void GenerateSectionLayout( class ISectionLayoutBuilder& LayoutBuilder ) const override {}
	virtual int32 OnPaintSection( const FGeometry& AllottedGeometry, const FSlateRect& SectionClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, bool bParentEnabled ) const override;
	virtual void Tick( const FGeometry& AllottedGeometry, const FGeometry& ParentGeometry, const double InCurrentTime, const float InDeltaTime ) override;
	
private:
	/* Re-creates the texture used to preview the waveform */
	void RegenerateWaveforms(TRange<float> DrawRange, int32 XOffset, int32 XSize);

private:
	/** The section we are visualizing */
	UMovieSceneSection& Section;
	
	/** The waveform thumbnail render object */
	TSharedPtr<class FAudioThumbnail> WaveformThumbnail;

	/** Stored data about the waveform to determine when it is invalidated */
	TRange<float> StoredDrawRange;
	int32 StoredXOffset;
	int32 StoredXSize;

	/** Whether this section is on a master audio track or an attached audio track */
	bool bIsOnAMasterTrack;
};