SDialogueNodeOverlayWidget.h

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// Copyright Csaba Molnar, Daniel Butum. All Rights Reserved.
#pragma once
 
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SCompoundWidget.h"
 
class SDialogueNodeOverlayWidget : public SCompoundWidget
{
    typedef SDialogueNodeOverlayWidget Self;
 
public:
    DECLARE_DELEGATE_OneParam(FOnHoverStateChanged, bool /* bHovered */);
 
    DECLARE_DELEGATE_RetVal_OneParam(FSlateColor, FOnGetBackgroundColor, bool /* bHovered */);
 
    SLATE_BEGIN_ARGS(SDialogueNodeOverlayWidget) {}
        SLATE_ATTRIBUTE(TSharedPtr<SWidget>, OverlayBody)
 
        // Events
        SLATE_EVENT(FOnHoverStateChanged, OnHoverStateChanged)
        SLATE_EVENT(FOnGetBackgroundColor, OnGetBackgroundColor)
    SLATE_END_ARGS()
 
    void Construct(const FArguments& InArgs);
 
    void OnMouseEnter(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override
    {
        OnHoverStateChangedEvent.ExecuteIfBound(true);
        SCompoundWidget::OnMouseEnter(MyGeometry, MouseEvent);
    }
 
    void OnMouseLeave(const FPointerEvent& MouseEvent) override
    {
        OnHoverStateChangedEvent.ExecuteIfBound(false);
        SCompoundWidget::OnMouseLeave(MouseEvent);
    }
 
    FSlateColor GetBackgroundColor() const
    {
        if (OnGetBackgroundColorEvent.IsBound())
            return OnGetBackgroundColorEvent.Execute(IsHovered());
 
        return FSlateColor::UseForeground();
    }
 
private:
    FOnHoverStateChanged OnHoverStateChangedEvent;
 
    FOnGetBackgroundColor OnGetBackgroundColorEvent;
 
    TSharedPtr<SWidget> OverlayBody;
};