SVolumeControl.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Attribute.h"
#include "Input/Reply.h"
#include "Styling/SlateWidgetStyleAsset.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SCompoundWidget.h"
#include "Styling/SlateTypes.h"
#include "Styling/CoreStyle.h"
#include "Framework/SlateDelegates.h"
 
class SSlider;
 
class SVolumeControl : public SCompoundWidget
{
public:
    DECLARE_DELEGATE_OneParam( FOnMuted, bool );
 
    SLATE_BEGIN_ARGS(SVolumeControl)
        : _Style( &FCoreStyle::Get().GetWidgetStyle<FVolumeControlStyle>("VolumeControl") )
        , _Volume(1.f)
        , _Muted(false)
        {}
 
        SLATE_STYLE_ARGUMENT( FVolumeControlStyle, Style )
 
        
        SLATE_ATTRIBUTE( float, Volume )
        SLATE_EVENT( FOnFloatValueChanged, OnVolumeChanged )
 
        
        SLATE_ATTRIBUTE( bool, Muted )
        SLATE_EVENT( FOnMuted, OnMuteChanged )
 
    SLATE_END_ARGS()
 
    
    SLATE_API void Construct( const SVolumeControl::FArguments& InDeclaration );
 
    float GetVolume() const { return VolumeAttribute.Get(); }
    bool IsMuted() const { return MutedAttribute.Get(); }
 
private:
    enum ESpeakerIcon
    {
        ES_Full,
        ES_Mid,
        ES_Low,
        ES_Off,
        ES_Muted,
 
        ES_MAX
    };
 
    TAttribute<float> VolumeAttribute;
    FOnFloatValueChanged OnVolumeChanged;
 
    TAttribute<bool> MutedAttribute;
    FOnMuted OnMutedChanged;
 
    TSharedPtr<SSlider> Slider;
 
    const FSlateBrush* SpeakerIcons[ES_MAX];
 
    float GetSliderPosition() const { return IsMuted() ? 0.f : GetVolume(); }
    SLATE_API const FSlateBrush* GetSpeakerImage() const;
    SLATE_API FReply OnMuteClicked();
    SLATE_API void OnWriteValue(float NewValue);
};