SColorSlider.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Widgets/SCompoundWidget.h"
 
#include "Styling/SlateTypes.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/Input/SSlider.h"
#include "Widgets/Input/SSpinBox.h"
 
class SColorSlider : public SCompoundWidget
{
public:
    SColorSlider();
 
    DECLARE_DELEGATE_OneParam(FOnValueChanged, float);
 
    SLATE_BEGIN_ARGS(SColorSlider)
        : _Value(0.0f)
        , _MinSpinBoxValue(0.0f)
        , _MaxSpinBoxValue(1.0f)
        , _MinSliderValue(0.0f)
        , _MaxSliderValue(1.0f)
        , _Delta(0.01f)
        , _SupportDynamicSliderMaxValue(true)
        , _Orientation(Orient_Horizontal)
        , _Label()
        , _GradientColors()
        , _HasAlphaBackground(false)
        , _UseSRGB(true)
        , _OnValueChanged()
        , _OnBeginSliderMovement()
        , _OnEndSliderMovement()
        , _OnBeginSpinBoxMovement()
        , _OnEndSpinBoxMovement()
    { }
 
        SLATE_ATTRIBUTE(float, Value)
 
        
        SLATE_ATTRIBUTE(float, MinSpinBoxValue)
 
        
        SLATE_ATTRIBUTE(float, MaxSpinBoxValue)
 
        
        SLATE_ATTRIBUTE(float, MinSliderValue)
 
        
        SLATE_ATTRIBUTE(float, MaxSliderValue)
 
        
        SLATE_ATTRIBUTE(float, Delta)
 
        
        SLATE_ATTRIBUTE(bool, SupportDynamicSliderMaxValue)
 
        
        SLATE_ATTRIBUTE(EOrientation, Orientation)
 
        
        SLATE_ATTRIBUTE(FText, Label)
 
        
        SLATE_ATTRIBUTE(TArray<FLinearColor>, GradientColors)
 
        
        SLATE_ATTRIBUTE(bool, HasAlphaBackground)
 
        
        SLATE_ATTRIBUTE(bool, UseSRGB)
 
        
        SLATE_EVENT(FOnValueChanged, OnValueChanged)
 
        
        SLATE_EVENT(FSimpleDelegate, OnBeginSliderMovement)
 
        
        SLATE_EVENT(FSimpleDelegate, OnEndSliderMovement)
 
        
        SLATE_EVENT(FSimpleDelegate, OnBeginSpinBoxMovement)
 
        
        SLATE_EVENT(FOnValueChanged, OnEndSpinBoxMovement)
 
    SLATE_END_ARGS()
 
    
    void Construct(const FArguments& InArgs);
 
protected:
    // Begin SWidget overrides
    virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
    virtual FVector2D ComputeDesiredSize(float) const override;
    // End SWidget overrides
 
private:
    void OnSpinBoxValueCommitted(float NewValue, ETextCommit::Type CommitType);
 
private:
    TSlateAttribute<EOrientation, EInvalidateWidgetReason::Paint> Orientation;
 
    TSlateAttribute<TArray<FLinearColor>, EInvalidateWidgetReason::Paint> GradientColors;
 
    TSlateAttribute<bool, EInvalidateWidgetReason::Paint> bHasAlphaBackground;
 
    TSlateAttribute<bool, EInvalidateWidgetReason::Paint> bUseSRGB;
 
    TSlateAttribute<bool, EInvalidateWidgetReason::Paint> bSupportDynamicSliderMaxValue;
 
    TSharedPtr<SSlider> Slider;
 
    float ColorSliderSize = 0.0f;
 
    static constexpr float Padding = 8.0f;
    static constexpr float LabelSize = 8.0f;
    static constexpr float SpinBoxSize = 60.0f;
 
    static constexpr float HorizontalSliderLength = 123.0f;
    static constexpr float HorizontalSliderHeight = 20.0f;
 
    static constexpr float VerticalSliderWidth = 28.0f;
    static constexpr float VerticalSliderHeight = 200.0f;
 
    const FSlateBrush* BorderBrush;
    const FSlateBrush* BorderActiveBrush;
    const FSlateBrush* BorderHoveredBrush;
    const FSlateBrush* AlphaBackgroundBrush;
};