Want to draw a Grid with On/Off tiles in a tab for a plugin.

Development Pipeline & Plugins Plugins
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I want to make a grid via OnPaint.

I’m currently working on a plugin for learning and i have trouble finding tutorials. Like any tutorials^^…

I’m not talking about the Blueprints Version, i want to override it for a Custom Asset. My Goal is to make a grid which dynamicly resizes when changing width and height, on which i can draw with mouse over. Something like a Binary Draw Editor. I don’t really know how OnPaint works at all, so anything would be helpfull.

Thanks for any help in advance. Code is below & Editor tab is just a white screen.

Have a good day!

.H

DECLARE_DELEGATE_OneParam(FOnChangedWidth,uint8)
DECLARE_DELEGATE_OneParam(FOnChangedHeight,uint8)

class DUNGEONCREATOREDITOR_API SDungeonRoomBrushWidget : public SCompoundWidget
{
public:
	SLATE_BEGIN_ARGS(SDungeonRoomBrushWidget)
		: _BrushWidth(12)
		, _BrushHeight(12)
	{}
	SLATE_ATTRIBUTE(uint8, BrushWidth)
	SLATE_ATTRIBUTE(uint8, BrushHeight)
	SLATE_EVENT(FOnChangedWidth,OnChangedWidth)
	SLATE_EVENT(FOnChangedHeight,OnChangedHeight)
	
	SLATE_END_ARGS()

	void Construct(const FArguments& InArgs);
	int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;


private:
	TAttribute<uint8> BrushWidth;
	TAttribute<uint8> BrushHeight;

	FOnChangedHeight OnChangedHeight;
	FOnChangedWidth OnChangedWidth;
};

.CPP

void SDungeonRoomBrushWidget::Construct(const FArguments& InArgs)
{
	BrushWidth = InArgs._BrushWidth;
	BrushHeight = InArgs._BrushHeight;
	OnChangedWidth = InArgs._OnChangedWidth;
	OnChangedHeight = InArgs._OnChangedHeight;

}

int32 SDungeonRoomBrushWidget::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{

	for(uint8 x = 0; x < BrushWidth.Get(); x++){
		for(uint8 y = 0; y < BrushHeight.Get(); y++){
			FSlateBrush* Rect = new FSlateBrush();
			
			Rect->OutlineSettings.Width = 1;
			Rect->DrawAs = ESlateBrushDrawType::Box;
			Rect->TintColor = FColor().FromHex("#626665");
			Rect->Margin = FMargin(10,10,0,0);
			
			FSlateDrawElement::MakeBox(OutDrawElements,LayerId,AllottedGeometry.ToPaintGeometry(),Rect);
		}	
	}
	
	return LayerId;
}